╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭511e1051..╮ 511e1051.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (615) user
╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯
.. embed/ event/ test/ ui/ command.zig diff3.zig event.zig find.zig fork.zig lib.zig main.zig main_wasm.zig markdown.zig patch.zig progress.zig push.zig search.zig search_commit.zig search_thread.zig serve.zig serve_common.zig serve_http.zig serve_ssh.zig serve_ssh_protocol.zig test.zig testnet.zig try.zig ui.zig ╭─────────────────────────────────╮ │web.zig │ ╰─────────────────────────────────╯
1 const std = @import("std"); 2 const xit = @import("xit"); 3 const rp = xit.repo; 4 const obj = xit.object; 5 const hash = xit.hash; 6 const evt = @import("./event.zig"); 7 const serve_common = @import("./serve_common.zig"); 8 const ui = @import("./ui.zig"); 9 const fork = @import("./fork.zig"); 10 const pch = @import("./patch.zig"); 11 const xitui = xit.xitui; 12 const wgt = xitui.widget; 13 const Focus = xitui.focus.Focus; 14 const Grid = xitui.grid.Grid; 15 16 const cookie_name = "haxy_session"; 17 // the session cookie a login or a claimed auto-login sets; both must scope 18 // it the same way. 19 const session_cookie_fmt = cookie_name ++ "={s}; Path=/; HttpOnly; SameSite=Strict"; 20 const form_flash_cookie = "haxy_form_flash"; 21 const local_flash_cookie = "haxy_local_flash"; 22 const local_required_title_prefix = "required_title:"; 23 const local_sync_failure_prefix = "sync:"; 24 25 const Embed = struct { 26 path: []const u8, 27 content_type: []const u8, 28 body: []const u8, 29 }; 30 31 const embeds = [_]Embed{ 32 .{ .path = "index.html", .content_type = "text/html; charset=utf-8", .body = @embedFile("embed/index.html") }, 33 .{ .path = "script.js", .content_type = "text/javascript; charset=utf-8", .body = @embedFile("embed/script.js") }, 34 .{ .path = "term.ttf", .content_type = "font/ttf", .body = @embedFile("embed/term.ttf") }, 35 .{ .path = "haxy.wasm", .content_type = "application/wasm", .body = @embedFile("haxy.wasm") }, 36 }; 37 38 // what a web request is served from: the multi-user server (admin repo + 39 // login sessions) or a single local repo. 40 pub const Host = union(evt.HostKind) { 41 local: ui.RepoSource, 42 server: struct { 43 admin_repo_path: []const u8, 44 users_dir: []const u8, 45 session_store: SessionStore, 46 git_http_port: ?u16, 47 git_ssh_port: ?u16, 48 git_ssh_prefix: []const u8, 49 }, 50 51 // where this host's event writes go 52 pub fn event(self: Host) evt.Host { 53 return switch (self) { 54 .local => .local, 55 .server => |server| .{ .server = .{ .users_dir = server.users_dir } }, 56 }; 57 } 58 }; 59 60 // an on-disk repo resolved from a request url. server paths are owned. 61 const RequestRepoSource = struct { 62 source: ui.RepoSource, 63 owned_path: ?[]const u8 = null, 64 65 fn deinit(self: RequestRepoSource, allocator: std.mem.Allocator) void { 66 if (self.owned_path) |path| allocator.free(path); 67 } 68 }; 69 70 fn requestRepoSource(io: std.Io, allocator: std.mem.Allocator, host: Host, repo_base: []const u8) !?RequestRepoSource { 71 return switch (host) { 72 .server => |server| blk: { 73 const repo_prefix = "/repo/"; 74 if (!std.mem.startsWith(u8, repo_base, repo_prefix)) break :blk null; 75 const path = switch (try serve_common.resolveRepoPath(io, allocator, server.users_dir, server.admin_repo_path, repo_base[repo_prefix.len..], false)) { 76 .ok => |value| value, 77 .invalid, .not_found => break :blk null, 78 }; 79 break :blk .{ 80 .source = .{ .path = path, .repo_kind = .xit }, 81 .owned_path = path, 82 }; 83 }, 84 .local => |source| if (repo_base.len == 0) .{ .source = source } else null, 85 }; 86 } 87 88 pub fn handleConnection( 89 io: std.Io, 90 allocator: std.mem.Allocator, 91 stream: std.Io.net.Stream, 92 host: Host, 93 err: *std.Io.Writer, 94 ) !void { 95 var send_buffer = [_]u8{0} ** 4096; 96 var recv_buffer = [_]u8{0} ** 4096; 97 var conn_br = stream.reader(io, &recv_buffer); 98 var conn_bw = stream.writer(io, &send_buffer); 99 var http_server = std.http.Server.init(&conn_br.interface, &conn_bw.interface); 100 101 // serve multiple requests on a single connection so HTTP/1.1 keep-alive 102 // works — important for browser-native form POST: after the 303 the 103 // browser issues GET / on the same socket, and forcibly closing here 104 // would race the follow-up request into a "site can't be reached". 105 while (http_server.reader.state == .ready) { 106 var request = http_server.receiveHead() catch |receive_err| switch (receive_err) { 107 error.HttpConnectionClosing => break, 108 error.ReadFailed => break, 109 else => |e| return e, 110 }; 111 112 handleRequest(io, &request, allocator, host) catch |request_err| { 113 serve_common.logError(io, err, "web ui request failed: {s}\n", .{@errorName(request_err)}); 114 // best-effort 500. if handleRequest already started writing a 115 // response before throwing, this respond may fail too, but at 116 // that point the connection is unrecoverable anyway. 117 request.respond(@errorName(request_err), .{ 118 .status = .internal_server_error, 119 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 120 }) catch {}; 121 }; 122 } 123 } 124 125 fn handleRequest( 126 io: std.Io, 127 request: *std.http.Server.Request, 128 allocator: std.mem.Allocator, 129 host: Host, 130 ) !void { 131 const method = request.head.method; 132 const owned_target = if (method == .POST) try allocator.dupe(u8, request.head.target) else null; 133 defer if (owned_target) |target| allocator.free(target); 134 const uri = try std.Uri.parseAfterScheme("", owned_target orelse request.head.target); 135 const path = uri.path.percent_encoded; 136 137 // POST routes can be scoped by any page, so they can redirect using 138 // the base of the URL. this allows logging in to keep you on the page 139 // you were on. local mode has no accounts, so only the repo routes. 140 if (method == .POST) { 141 switch (host) { 142 .server => |server| { 143 // the home page's new repo form, which the "/new" suffix below would claim 144 if (std.mem.eql(u8, path, "/repo/new")) return handleRepoNew(io, request, allocator, path, server.admin_repo_path, server.users_dir, server.session_store); 145 const PostRoute = enum { login, logout, ansi, @"new-repo", new, edit, remove, open, close, resolve, publish, merge, squash, attach, undo, clear }; 146 inline for (@typeInfo(PostRoute).@"enum".fields) |field| { 147 const suffix = "/" ++ field.name; 148 if (std.mem.endsWith(u8, path, suffix)) { 149 const base = path[0 .. path.len - suffix.len]; 150 return switch (@field(PostRoute, field.name)) { 151 .login => handleLogin(io, request, allocator, base, server.admin_repo_path, server.session_store), 152 .logout => handleLogout(request, base, server.session_store), 153 .ansi => handleAnsi(io, request, allocator, base, server.admin_repo_path, server.users_dir, server.session_store), 154 .@"new-repo" => handleRepoNew(io, request, allocator, path, server.admin_repo_path, server.users_dir, server.session_store), 155 .new => handleNew(io, request, allocator, base, host), 156 .edit => handleEdit(io, request, allocator, base, host), 157 .remove => handleRemove(io, request, allocator, base, host), 158 .open => handleThreadStatus(io, request, allocator, base, host, true), 159 .close => handleThreadStatus(io, request, allocator, base, host, false), 160 .resolve => handleThreadResolve(io, request, allocator, base, host), 161 .publish => handlePatchPublish(io, request, allocator, base, host), 162 .merge => handlePatchMerge(io, request, allocator, base, host, .source), 163 .squash => handlePatchMerge(io, request, allocator, base, host, .squash), 164 .undo => handleUndo(io, request, allocator, base, host, .undo), 165 .clear => handleUndo(io, request, allocator, base, host, .clear), 166 .attach => handleAttach(io, request, allocator, base, host), 167 }; 168 } 169 } 170 }, 171 .local => |local| { 172 const PostRoute = enum { new, edit, remove, open, close, resolve, sync, attach, undo, clear }; 173 inline for (@typeInfo(PostRoute).@"enum".fields) |field| { 174 const suffix = "/" ++ field.name; 175 if (std.mem.endsWith(u8, path, suffix)) { 176 const base = path[0 .. path.len - suffix.len]; 177 return switch (@field(PostRoute, field.name)) { 178 .new => handleNew(io, request, allocator, base, host), 179 .edit => handleEdit(io, request, allocator, base, host), 180 .remove => handleRemove(io, request, allocator, base, host), 181 .open => handleThreadStatus(io, request, allocator, base, host, true), 182 .close => handleThreadStatus(io, request, allocator, base, host, false), 183 .resolve => handleThreadResolve(io, request, allocator, base, host), 184 .sync => handleSync(io, request, allocator, base, local), 185 .undo => handleUndo(io, request, allocator, base, host, .undo), 186 .clear => handleUndo(io, request, allocator, base, host, .clear), 187 .attach => handleAttach(io, request, allocator, base, host), 188 }; 189 } 190 } 191 }, 192 } 193 } 194 195 const get_or_head = method == .GET or method == .HEAD; 196 if (!get_or_head) { 197 try request.respond("method not allowed", .{ 198 .status = .method_not_allowed, 199 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 200 }); 201 return; 202 } 203 204 if (std.mem.eql(u8, path, "/favicon.ico")) { 205 try request.respond("", .{ 206 .status = .no_content, 207 .extra_headers = &.{.{ .name = "content-type", .value = "image/x-icon" }}, 208 }); 209 return; 210 } 211 212 // an attachment serves raw bytes rather than a page, so it is matched 213 // before the routable pages 214 if (attachmentRequest(path)) |attachment| return serveAttachment(io, request, allocator, attachment, host); 215 216 const route_maybe = switch (host) { 217 .server => ui.RoutablePage.fromUrl(path), 218 .local => ui.RoutablePage.fromUrlLocal(path), 219 }; 220 // a path that's neither a page nor an embed gets the not-found page 221 if (route_maybe == null) if (findEmbed(path)) |embed| { 222 // the embeds change with every build, so the browser must revalidate 223 // rather than heuristically cache them across server restarts 224 try request.respond(embed.body, .{ 225 .extra_headers = &.{ 226 .{ .name = "content-type", .value = embed.content_type }, 227 .{ .name = "cache-control", .value = "no-cache" }, 228 }, 229 }); 230 return; 231 }; 232 { 233 const current_page = route_maybe orelse .not_found; 234 // resolve the haxy_session cookie's token to a user_id via the 235 // store. user_id_buf lives on the stack for the rest of handleRequest, 236 // which is plenty for renderIndexHtml to consume. local mode has no 237 // accounts, so it is always logged out. 238 var user_id_buf: [evt.event_id_size]u8 = undefined; 239 var user_id: ?[]const u8 = null; 240 // the session token that named the user, so a stale one can be revoked 241 var token_buf: [SessionStore.token_hex_len]u8 = undefined; 242 var session_token: ?[]const u8 = null; 243 var form_arena = std.heap.ArenaAllocator.init(allocator); 244 defer form_arena.deinit(); 245 var form_feedback: ?ui.Session.FormFeedback = null; 246 var form_cookie_seen = false; 247 var local_flash_seen = false; 248 var sync_failure: ?[]const u8 = null; 249 var sync_failure_allocated: ?[]u8 = null; 250 defer if (sync_failure_allocated) |value| allocator.free(value); 251 // backs the cookie a claimed auto-login sets 252 var cookie_buf: [256]u8 = undefined; 253 var session_cookie: ?[]const u8 = null; 254 switch (host) { 255 .server => |server| { 256 user_id = blk: { 257 const token = getCookieValue(request, cookie_name) orelse break :blk null; 258 if (!server.session_store.lookup(token, &user_id_buf)) break :blk null; 259 session_token = token; 260 break :blk user_id_buf[0..evt.event_id_size]; 261 }; 262 // whoever seeded the store may have left a session to claim 263 if (user_id == null) { 264 if (server.session_store.autoLogin(&token_buf) and server.session_store.lookup(&token_buf, &user_id_buf)) { 265 session_cookie = try std.fmt.bufPrint(&cookie_buf, session_cookie_fmt, .{token_buf}); 266 session_token = &token_buf; 267 user_id = user_id_buf[0..evt.event_id_size]; 268 } 269 } 270 if (getCookieValue(request, form_flash_cookie)) |token| { 271 form_cookie_seen = true; 272 form_feedback = server.session_store.takeFlash(form_arena.allocator(), token); 273 } 274 }, 275 .local => { 276 if (getCookieValue(request, local_flash_cookie)) |raw| { 277 local_flash_seen = true; 278 if (std.mem.startsWith(u8, raw, local_required_title_prefix)) { 279 const tag = std.meta.stringToEnum(std.meta.Tag(ui.Session.FormFeedback), raw[local_required_title_prefix.len..]); 280 form_feedback = if (tag) |feedback_tag| switch (feedback_tag) { 281 .issue => .{ .issue = .{ .failure = .required_title } }, 282 .patch => .{ .patch = .{ .failure = .required_title } }, 283 .discussion => .{ .discussion = .{ .failure = .required_title } }, 284 else => null, 285 } else null; 286 } else if (std.mem.startsWith(u8, raw, local_sync_failure_prefix)) { 287 const value = try allocator.dupe(u8, raw[local_sync_failure_prefix.len..]); 288 sync_failure_allocated = value; 289 sync_failure = std.Uri.percentDecodeInPlace(value); 290 } 291 } 292 }, 293 } 294 295 const git_http_port: ?u16, const git_ssh_port: ?u16, const git_ssh_prefix: []const u8 = switch (host) { 296 .server => |server| .{ server.git_http_port, server.git_ssh_port, server.git_ssh_prefix }, 297 .local => .{ null, null, "" }, 298 }; 299 var session_data: ui.Session.Data = .{ 300 .user_id = user_id, 301 .form_feedback = form_feedback, 302 .sync_failure = sync_failure, 303 .current_page = current_page, 304 .host_kind = std.meta.activeTag(host), 305 .git_http_port = git_http_port, 306 .git_ssh_port = git_ssh_port, 307 .git_ssh_prefix = git_ssh_prefix, 308 }; 309 // a page that can't be built shows the not-found page instead 310 const html = renderIndexHtml(io, allocator, host, session_token, session_data) catch |err| switch (err) { 311 error.NotFound => blk: { 312 session_data.current_page = .not_found; 313 break :blk try renderIndexHtml(io, allocator, host, session_token, session_data); 314 }, 315 else => |e| return e, 316 }; 317 defer allocator.free(html); 318 319 const expired_form_cookie = if (form_cookie_seen) 320 try std.fmt.allocPrint(allocator, form_flash_cookie ++ "=; Path={s}; Max-Age=0", .{path}) 321 else 322 null; 323 defer if (expired_form_cookie) |cookie| allocator.free(cookie); 324 var header_buf: [4]std.http.Header = undefined; 325 var headers: std.ArrayList(std.http.Header) = .initBuffer(&header_buf); 326 headers.appendAssumeCapacity(.{ .name = "content-type", .value = "text/html; charset=utf-8" }); 327 if (expired_form_cookie) |cookie| headers.appendAssumeCapacity(.{ .name = "set-cookie", .value = cookie }); 328 if (local_flash_seen) headers.appendAssumeCapacity(.{ .name = "set-cookie", .value = local_flash_cookie ++ "=; Path=/; Max-Age=0" }); 329 if (session_cookie) |cookie| headers.appendAssumeCapacity(.{ .name = "set-cookie", .value = cookie }); 330 try request.respond(html, .{ 331 .status = if (session_data.current_page == .not_found) .not_found else .ok, 332 .extra_headers = headers.items, 333 }); 334 } 335 } 336 337 fn handleLogin( 338 io: std.Io, 339 request: *std.http.Server.Request, 340 allocator: std.mem.Allocator, 341 base: []const u8, 342 admin_repo_path: []const u8, 343 session_store: SessionStore, 344 ) !void { 345 const body = try readFormBody(request, allocator); 346 defer allocator.free(body); 347 348 const username = (try parseFormField(allocator, body, "username")) orelse try allocator.dupe(u8, ""); 349 defer allocator.free(username); 350 const password = (try parseFormField(allocator, body, "password")) orelse try allocator.dupe(u8, ""); 351 defer allocator.free(password); 352 353 const Repo = rp.Repo(.xit, evt.admin_repo_opts); 354 var repo = try Repo.open(io, allocator, .{ .path = admin_repo_path }); 355 defer repo.deinit(io, allocator); 356 357 var arena = std.heap.ArenaAllocator.init(allocator); 358 defer arena.deinit(); 359 360 const haxy_moment = try evt.currentMoment(evt.admin_repo_opts, &repo); 361 const result = try evt.User.verifyCredentials(evt.AdminDB, evt.admin_repo_opts.hash, haxy_moment, &arena, username, password); 362 363 // on success, return to the page the login came from (base, or "/" at the 364 // root); on failure, stay on its auth tab to surface the error. 365 const success_location: []const u8 = if (base.len == 0) "/" else base; 366 const failure_location = try std.fmt.allocPrint(arena.allocator(), "{s}/auth", .{base}); 367 368 switch (result) { 369 .success => |user_id| { 370 const token = try session_store.create(&user_id); 371 var cookie_buf: [256]u8 = undefined; 372 const cookie = try std.fmt.bufPrint(&cookie_buf, session_cookie_fmt, .{token}); 373 try request.respond("", .{ 374 .status = .see_other, 375 .extra_headers = &.{ 376 .{ .name = "location", .value = success_location }, 377 .{ .name = "set-cookie", .value = cookie }, 378 }, 379 }); 380 }, 381 .unknown_user => try respondFormFailure(request, allocator, session_store, failure_location, .{ .login = .{ .failure = .unknown_user, .username = username } }), 382 .wrong_password => try respondFormFailure(request, allocator, session_store, failure_location, .{ .login = .{ .failure = .wrong_password, .username = username } }), 383 } 384 } 385 386 fn respondFormFailure(request: *std.http.Server.Request, allocator: std.mem.Allocator, session_store: SessionStore, location: []const u8, feedback: ui.Session.FormFeedback) !void { 387 const token = try session_store.createFlash(allocator, feedback); 388 const cookie = try std.fmt.allocPrint(allocator, form_flash_cookie ++ "={s}; Path={s}; HttpOnly; SameSite=Strict", .{ token, location }); 389 defer allocator.free(cookie); 390 try request.respond("", .{ 391 .status = .see_other, 392 .extra_headers = &.{ 393 .{ .name = "location", .value = location }, 394 .{ .name = "set-cookie", .value = cookie }, 395 }, 396 }); 397 } 398 399 fn respondThreadFormFailure(request: *std.http.Server.Request, allocator: std.mem.Allocator, host: Host, location: []const u8, feedback: ui.Session.FormFeedback) !void { 400 return switch (host) { 401 .server => |server| respondFormFailure(request, allocator, server.session_store, location, feedback), 402 .local => { 403 const tag = std.meta.activeTag(feedback); 404 const required_title = switch (feedback) { 405 .issue => |value| value.failure == .required_title, 406 .discussion => |value| value.failure == .required_title, 407 .patch => |value| value.failure == .required_title, 408 else => false, 409 }; 410 if (!required_title) return error.InvalidFormFeedback; 411 const cookie = try std.fmt.allocPrint(allocator, local_flash_cookie ++ "=" ++ local_required_title_prefix ++ "{s}; Path=/; HttpOnly; SameSite=Strict", .{@tagName(tag)}); 412 defer allocator.free(cookie); 413 try request.respond("", .{ 414 .status = .see_other, 415 .extra_headers = &.{ 416 .{ .name = "location", .value = location }, 417 .{ .name = "set-cookie", .value = cookie }, 418 }, 419 }); 420 }, 421 }; 422 } 423 424 fn requiredTitleFeedback(kind: evt.EventKind, title: []const u8, labels: []const u8, description: []const u8, target_branch: []const u8, source_branch: ?[]const u8) ui.Session.FormFeedback { 425 return switch (kind) { 426 .issue => .{ .issue = .{ .failure = .required_title, .fields = .{ 427 .title = title, 428 .labels = labels, 429 .description = description, 430 } } }, 431 .patch => patchFeedback(.required_title, title, labels, description, target_branch, source_branch), 432 .discuss => .{ .discussion = .{ .failure = .required_title, .fields = .{ 433 .title = title, 434 .labels = labels, 435 .description = description, 436 } } }, 437 else => unreachable, 438 }; 439 } 440 441 fn patchFeedback(failure: ui.Session.FormFeedback.PatchFailure, title: []const u8, labels: []const u8, description: []const u8, target_branch: []const u8, source_branch: ?[]const u8) ui.Session.FormFeedback { 442 return .{ .patch = .{ .failure = failure, .fields = .{ 443 .title = title, 444 .labels = labels, 445 .description = description, 446 .target_branch = target_branch, 447 .source_branch = source_branch orelse "", 448 .source_kind = if (source_branch != null) .branch else .fork, 449 } } }; 450 } 451 452 fn handleLogout(request: *std.http.Server.Request, base: []const u8, session_store: SessionStore) !void { 453 // revoke the session server-side so the cookie is dead for anyone holding 454 // a copy, not just this browser. 455 if (getCookieValue(request, cookie_name)) |token| session_store.remove(token); 456 // return to the page the logout came from (base, or "/" at the root). 457 const location: []const u8 = if (base.len == 0) "/" else base; 458 // close the connection instead of keeping it alive: we don't read the 459 // request body, and respond()'s keep-alive path would otherwise try to 460 // discard it — which asserts on a bodyless POST that carries no 461 // content-length, and would block on one with no framing at all. a logout 462 // is just a redirect, so the browser reconnects for the follow-up GET. 463 try request.respond("", .{ 464 .status = .see_other, 465 .keep_alive = false, 466 .extra_headers = &.{ 467 .{ .name = "location", .value = location }, 468 .{ .name = "set-cookie", .value = cookie_name ++ "=; Path=/; HttpOnly; SameSite=Strict; Max-Age=0" }, 469 }, 470 }); 471 } 472 473 fn handleAnsi( 474 io: std.Io, 475 request: *std.http.Server.Request, 476 allocator: std.mem.Allocator, 477 base: []const u8, 478 admin_repo_path: []const u8, 479 users_dir: []const u8, 480 session_store: SessionStore, 481 ) !void { 482 // the toggle re-emits the user's own event, so it takes a logged-in user 483 var user_id: [evt.event_id_size]u8 = undefined; 484 const token = getCookieValue(request, cookie_name) orelse return respondLoginRequired(request); 485 if (!session_store.lookup(token, &user_id)) return respondLoginRequired(request); 486 487 { 488 const Repo = rp.Repo(.xit, evt.admin_repo_opts); 489 var repo = try Repo.open(io, allocator, .{ .path = admin_repo_path }); 490 defer repo.deinit(io, allocator); 491 492 try evt.User.toggleAnsi(evt.admin_repo_opts, io, allocator, &repo, users_dir, &user_id); 493 } 494 495 // return to the auth tab the toggle came from so the change is visible. 496 const location = try std.fmt.allocPrint(allocator, "{s}/auth", .{base}); 497 defer allocator.free(location); 498 499 // like logout, this is a bodyless POST, so close the connection rather than 500 // letting the keep-alive path try to discard a body that isn't framed. 501 try request.respond("", .{ 502 .status = .see_other, 503 .keep_alive = false, 504 .extra_headers = &.{ 505 .{ .name = "location", .value = location }, 506 }, 507 }); 508 } 509 510 // the actor for a write to the repo `repo_base` names with at least `min_role`, 511 // or null once the refusal has been sent. local mode always writes. 512 fn authorizeWrite( 513 io: std.Io, 514 allocator: std.mem.Allocator, 515 arena: *std.heap.ArenaAllocator, 516 request: *std.http.Server.Request, 517 host: Host, 518 repo_base: []const u8, 519 min_role: evt.Repo.Role, 520 ) !?ui.Actor { 521 const server = switch (host) { 522 .server => |server| server, 523 .local => |src| return .{ .author = try ui.localAuthor(src, io, allocator, arena), .role = .owner }, 524 }; 525 const authorization: ui.Authorization = blk: { 526 const user_id = requestUserId(request, server.session_store) orelse break :blk .login_required; 527 528 const repo_prefix = "/repo/"; 529 if (!std.mem.startsWith(u8, repo_base, repo_prefix)) break :blk .repo_not_found; 530 531 var admin_repo = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 532 defer admin_repo.deinit(io, allocator); 533 const moment = try evt.currentMoment(evt.admin_repo_opts, &admin_repo); 534 break :blk try ui.authorizeUser(io, moment, arena, server.users_dir, user_id, repo_base[repo_prefix.len..], min_role); 535 }; 536 switch (authorization) { 537 .actor => |actor| return actor, 538 .login_required => try respondLoginRequired(request), 539 .repo_not_found => try respondRepoNotFound(request), 540 .forbidden => try respondForbidden(request), 541 } 542 return null; 543 } 544 545 // whether the request may read the repo `repo_base` names. local mode always 546 // may. 547 fn mayRead( 548 io: std.Io, 549 allocator: std.mem.Allocator, 550 request: *std.http.Server.Request, 551 host: Host, 552 repo_base: []const u8, 553 ) !bool { 554 const server = switch (host) { 555 .server => |server| server, 556 .local => return true, 557 }; 558 const repo_prefix = "/repo/"; 559 if (!std.mem.startsWith(u8, repo_base, repo_prefix)) return false; 560 561 var admin_repo = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 562 defer admin_repo.deinit(io, allocator); 563 var arena = std.heap.ArenaAllocator.init(allocator); 564 defer arena.deinit(); 565 const moment = try evt.currentMoment(evt.admin_repo_opts, &admin_repo); 566 const user_id = blk: { 567 const id = requestUserId(request, server.session_store) orelse break :blk null; 568 break :blk if (try ui.activeUser(moment, &arena, id) != null) id else null; 569 }; 570 const owner_repo = evt.parseOwnerRepoPath(repo_base[repo_prefix.len..]) orelse return false; 571 const repo = (try evt.readRepoByOwnerAndName(io, allocator, &arena, moment, server.users_dir, owner_repo.owner, owner_repo.name)) orelse return false; 572 return evt.Repo.roleOf(repo.repo, user_id) != .none; 573 } 574 575 // the logged-in user the request's session cookie names 576 fn requestUserId(request: *std.http.Server.Request, session_store: SessionStore) ?[evt.event_id_size]u8 { 577 const token = getCookieValue(request, cookie_name) orelse return null; 578 var user_id: [evt.event_id_size]u8 = undefined; 579 return if (session_store.lookup(token, &user_id)) user_id else null; 580 } 581 582 // refuse a write from a request with no logged-in user. the body goes unread, 583 // so the connection closes. 584 fn respondLoginRequired(request: *std.http.Server.Request) !void { 585 try request.respond("log in to make changes", .{ 586 .status = .forbidden, 587 .keep_alive = false, 588 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 589 }); 590 } 591 592 // refuse a write the user's role in the repo doesn't allow 593 fn respondForbidden(request: *std.http.Server.Request) !void { 594 try request.respond("you don't have permission to do that", .{ 595 .status = .forbidden, 596 .keep_alive = false, 597 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 598 }); 599 } 600 601 fn respondRepoNotFound(request: *std.http.Server.Request) !void { 602 try request.respond("repo not found", .{ 603 .status = .not_found, 604 .keep_alive = false, 605 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 606 }); 607 } 608 609 // new actions share a suffix; the base identifies whether the form creates a 610 // thread or comment. 611 fn handleNew( 612 io: std.Io, 613 request: *std.http.Server.Request, 614 allocator: std.mem.Allocator, 615 base: []const u8, 616 host: Host, 617 ) !void { 618 if (commentBaseParts(base) != null) return handleCommentNew(io, request, allocator, base, host); 619 620 const issues_suffix = "/issues"; 621 if (std.mem.endsWith(u8, base, issues_suffix)) 622 return handleThreadNew(io, request, allocator, base[0 .. base.len - issues_suffix.len], host, .issue); 623 const discussions_suffix = "/discussions"; 624 if (std.mem.endsWith(u8, base, discussions_suffix)) 625 return handleThreadNew(io, request, allocator, base[0 .. base.len - discussions_suffix.len], host, .discuss); 626 const patches_suffix = "/patches"; 627 if (std.mem.endsWith(u8, base, patches_suffix)) 628 return handleThreadNew(io, request, allocator, base[0 .. base.len - patches_suffix.len], host, .patch); 629 630 try request.respond("new event target not found", .{ 631 .status = .not_found, 632 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 633 }); 634 } 635 636 // create a repo for the logged-in user and redirect to it. a failure goes 637 // back to the new-repo page that posted the form. 638 fn handleRepoNew( 639 io: std.Io, 640 request: *std.http.Server.Request, 641 allocator: std.mem.Allocator, 642 form_location: []const u8, 643 admin_repo_path: []const u8, 644 users_dir: []const u8, 645 session_store: SessionStore, 646 ) !void { 647 const user_id = requestUserId(request, session_store) orelse return respondLoginRequired(request); 648 var arena = std.heap.ArenaAllocator.init(allocator); 649 defer arena.deinit(); 650 const user = blk: { 651 var admin_repo = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = admin_repo_path }); 652 defer admin_repo.deinit(io, allocator); 653 const moment = try evt.currentMoment(evt.admin_repo_opts, &admin_repo); 654 break :blk (try ui.activeUser(moment, &arena, user_id)) orelse return respondLoginRequired(request); 655 }; 656 657 const body = try readFormBody(request, allocator); 658 defer allocator.free(body); 659 const name = (try parseFormField(allocator, body, "name")) orelse try allocator.dupe(u8, ""); 660 defer allocator.free(name); 661 const description = (try parseFormField(allocator, body, "description")) orelse try allocator.dupe(u8, ""); 662 defer allocator.free(description); 663 const hash_value = (try parseFormField(allocator, body, "hash")) orelse try allocator.dupe(u8, ""); 664 defer allocator.free(hash_value); 665 const access_value = (try parseFormField(allocator, body, "access")) orelse try allocator.dupe(u8, ""); 666 defer allocator.free(access_value); 667 const bad_request: std.http.Server.Request.RespondOptions = .{ .status = .bad_request, .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }} }; 668 const hash_kind = std.meta.stringToEnum(hash.HashKind, hash_value) orelse return request.respond("invalid hash", bad_request); 669 const access = std.meta.stringToEnum(evt.Repo.Access, access_value) orelse return request.respond("invalid access", bad_request); 670 671 _ = evt.createRepo(io, allocator, users_dir, &user_id, .{ .name = user.event.name, .email = user.event.email }, name, description, access, hash_kind) catch |err| { 672 const failure = ui.Session.FormFeedback.RepoFailure.fromError(err) orelse return err; 673 return respondFormFailure(request, allocator, session_store, form_location, .{ .repo = .{ .failure = failure, .fields = .{ 674 .name = name, 675 .description = description, 676 .hash = hash_kind, 677 .access = access, 678 } } }); 679 }; 680 681 const location = try std.fmt.allocPrint(allocator, "/repo/{s}/{s}", .{ user.event.name, name }); 682 defer allocator.free(location); 683 try request.respond("", .{ 684 .status = .see_other, 685 .extra_headers = &.{.{ .name = "location", .value = location }}, 686 }); 687 } 688 689 // create a thread in the repo the form's page names and redirect to it. 690 fn handleThreadNew( 691 io: std.Io, 692 request: *std.http.Server.Request, 693 allocator: std.mem.Allocator, 694 base: []const u8, 695 host: Host, 696 kind: evt.EventKind, 697 ) !void { 698 var author_arena = std.heap.ArenaAllocator.init(allocator); 699 defer author_arena.deinit(); 700 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, base, .read)) orelse return; 701 const author = actor.author; 702 const body = try readFormBody(request, allocator); 703 defer allocator.free(body); 704 705 const title = (try parseFormField(allocator, body, "title")) orelse try allocator.dupe(u8, ""); 706 defer allocator.free(title); 707 const labels = (try parseFormField(allocator, body, "labels")) orelse try allocator.dupe(u8, ""); 708 defer allocator.free(labels); 709 const description_crlf = (try parseFormField(allocator, body, "description")) orelse try allocator.dupe(u8, ""); 710 defer allocator.free(description_crlf); 711 // form submission normalizes textarea line breaks to CRLF; store plain 712 // newlines so the text renders the same on every host 713 const description = try std.mem.replaceOwned(u8, allocator, description_crlf, "\r\n", "\n"); 714 defer allocator.free(description); 715 const target_branch = (try parseFormField(allocator, body, "target_branch")) orelse try allocator.dupe(u8, ""); 716 defer allocator.free(target_branch); 717 718 const source_branch = if (kind == .patch) try parseFormField(allocator, body, "source_branch") else null; 719 defer if (source_branch) |branch| allocator.free(branch); 720 721 const valid = switch (kind) { 722 .issue => evt.Issue.fieldsValid(title, labels), 723 .patch => evt.Patch.fieldsValid(title, labels), 724 .discuss => evt.Discussion.fieldsValid(title, labels), 725 else => unreachable, 726 }; 727 if (!valid) { 728 const list_name: []const u8 = switch (kind) { 729 .issue => "issues", 730 .patch => "patches", 731 .discuss => "discussions", 732 else => unreachable, 733 }; 734 const form_location = try std.fmt.allocPrint(allocator, "{s}/{s}/new", .{ base, list_name }); 735 defer allocator.free(form_location); 736 if (!evt.titleValid(title)) { 737 return respondThreadFormFailure(request, allocator, host, form_location, requiredTitleFeedback(kind, title, labels, description, target_branch, source_branch)); 738 } 739 try request.respond("", .{ 740 .status = .see_other, 741 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 742 }); 743 return; 744 } 745 746 var id_bytes: [evt.event_id_size]u8 = undefined; 747 io.random(&id_bytes); 748 const event_id_hex = std.fmt.bytesToHex(id_bytes, .lower); 749 750 const not_found = "repo not found"; 751 const request_repo = (try requestRepoSource(io, allocator, host, base)) orelse { 752 try request.respond(not_found, .{ 753 .status = .not_found, 754 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 755 }); 756 return; 757 }; 758 defer request_repo.deinit(allocator); 759 const source = request_repo.source; 760 if (kind == .patch and source_branch == null) { 761 const server = switch (host) { 762 .server => |server| server, 763 .local => return respondRemoveNotFound(request), 764 }; 765 const user_id = actor.user_id orelse return respondLoginRequired(request); 766 if (!evt.Patch.branchValid(target_branch) or !try request_repo.source.hasBranch(io, allocator, target_branch)) { 767 const form_location = try std.fmt.allocPrint(allocator, "{s}/patches/new", .{base}); 768 defer allocator.free(form_location); 769 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(.invalid_target_branch, title, labels, description, target_branch, null)); 770 } 771 const repo_id = evt.parseEventId(std.fs.path.basename(request_repo.source.path)) catch return respondRemoveNotFound(request); 772 const repo_user_id = actor.repo_user_id orelse unreachable; 773 const fork_path = try fork.create(.{}, io, allocator, server.users_dir, .{ 774 .id = event_id_hex, 775 .user_id = user_id, 776 .repo_id = repo_id, 777 .repo_user_id = repo_user_id, 778 .title = title, 779 .description = description, 780 .labels = labels, 781 .target_branch = target_branch, 782 .author = author, 783 .timestamp = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()), 784 }); 785 defer allocator.free(fork_path); 786 } else { 787 const event = evt.EventWithId{ 788 .id = event_id_hex, 789 .timestamp = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()), 790 .author = author, 791 .event = switch (kind) { 792 .issue => .{ .issue = .{ .title = title, .description = description, .labels = labels } }, 793 .patch => .{ .patch = .{ .title = title, .description = description, .labels = labels, .target_branch = target_branch, .source_branch = source_branch } }, 794 .discuss => .{ .discuss = .{ .title = title, .description = description, .labels = labels } }, 795 else => unreachable, 796 }, 797 }; 798 799 switch (source.repo_kind) { 800 inline else => |repo_kind| { 801 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 802 defer any_repo.deinit(io, allocator); 803 switch (any_repo) { 804 inline else => |*repo| { 805 const result = if (kind == .patch) 806 pch.writeBranchPatch(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, event_id_hex, event.event.patch orelse unreachable, null, author) 807 else 808 evt.consume(host.event(), .repo, repo_kind, repo.self_repo_opts, io, allocator, repo, evt.events_ref, &.{event}); 809 result catch |err| { 810 if (kind != .patch) return err; 811 const failure = ui.Session.FormFeedback.PatchFailure.fromError(err) orelse return err; 812 const form_location = try std.fmt.allocPrint(allocator, "{s}/patches/new", .{base}); 813 defer allocator.free(form_location); 814 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(failure, title, labels, description, target_branch, source_branch)); 815 }; 816 }, 817 } 818 }, 819 } 820 } 821 822 const location = try std.fmt.allocPrint(allocator, "{s}/{s}:{s}", .{ base, @tagName(kind), &event_id_hex }); 823 defer allocator.free(location); 824 try request.respond("", .{ 825 .status = .see_other, 826 .extra_headers = &.{.{ .name = "location", .value = location }}, 827 }); 828 } 829 830 const CommentBaseParts = struct { 831 repo_base: []const u8, 832 thread_kind: evt.EventKind, 833 thread_id: [evt.event_id_size]u8, 834 comment_id: ?[evt.event_id_size]u8, 835 }; 836 837 fn commentBaseParts(base: []const u8) ?CommentBaseParts { 838 const route = ui.RoutablePage.fromUrl(base) orelse ui.RoutablePage.fromUrlLocal(base) orelse return null; 839 const identity, const thread_kind, const thread_hex, const comment_hex = switch (route) { 840 .repo_issues => |*issue| .{ issue.name.slice(), evt.EventKind.issue, issue.selected.slice(), issue.comment.slice() }, 841 .repo_patches => |*patch| .{ patch.name.slice(), evt.EventKind.patch, patch.selected.slice(), patch.comment.slice() }, 842 .repo_discussions => |*discussion| .{ discussion.name.slice(), evt.EventKind.discuss, discussion.selected.slice(), discussion.comment.slice() }, 843 else => return null, 844 }; 845 const thread_id = evt.parseEventId(thread_hex) catch return null; 846 const comment_id = if (comment_hex.len == 0) null else evt.parseEventId(comment_hex) catch return null; 847 const repo_base_len = if (identity.len == 0) 0 else "/repo/".len + identity.len; 848 return .{ .repo_base = base[0..repo_base_len], .thread_kind = thread_kind, .thread_id = thread_id, .comment_id = comment_id }; 849 } 850 851 fn handlePatchPublish( 852 io: std.Io, 853 request: *std.http.Server.Request, 854 allocator: std.mem.Allocator, 855 base: []const u8, 856 host: Host, 857 ) !void { 858 const parts = commentBaseParts(base) orelse return respondRemoveNotFound(request); 859 if (parts.thread_kind != .patch or parts.comment_id != null) return respondRemoveNotFound(request); 860 const server = switch (host) { 861 .server => |server| server, 862 .local => return respondRemoveNotFound(request), 863 }; 864 var author_arena = std.heap.ArenaAllocator.init(allocator); 865 defer author_arena.deinit(); 866 // only the draft's author may publish it, which publish checks 867 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 868 const user_id = actor.user_id orelse return respondLoginRequired(request); 869 const author = actor.author; 870 871 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 872 defer request_repo.deinit(allocator); 873 const repo_id = evt.parseEventId(std.fs.path.basename(request_repo.source.path)) catch return respondRemoveNotFound(request); 874 var target_repo = try rp.AnyRepo(.xit, .{}).open(io, allocator, request_repo.source.localInitOpts()); 875 defer target_repo.deinit(io, allocator); 876 var admin_repo = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 877 defer admin_repo.deinit(io, allocator); 878 const id = std.fmt.bytesToHex(parts.thread_id, .lower); 879 switch (target_repo) { 880 inline else => |*repo| try pch.publish(repo.self_repo_opts, io, allocator, server.users_dir, &admin_repo, repo, .{ 881 .id = id, 882 .user_id = user_id, 883 .repo_id = repo_id, 884 .author = author, 885 .timestamp = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()), 886 }), 887 } 888 try request.respond("", .{ 889 .status = .see_other, 890 .extra_headers = &.{.{ .name = "location", .value = base }}, 891 }); 892 } 893 894 fn handlePatchMerge( 895 io: std.Io, 896 request: *std.http.Server.Request, 897 allocator: std.mem.Allocator, 898 base: []const u8, 899 host: Host, 900 revision: evt.Patch.MergeRevision, 901 ) !void { 902 const parts = commentBaseParts(base) orelse return respondRemoveNotFound(request); 903 if (parts.thread_kind != .patch or parts.comment_id != null) return respondRemoveNotFound(request); 904 const server = switch (host) { 905 .server => |server| server, 906 .local => return respondRemoveNotFound(request), 907 }; 908 var author_arena = std.heap.ArenaAllocator.init(allocator); 909 defer author_arena.deinit(); 910 const author = ((try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .write)) orelse return).author; 911 912 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 913 defer request_repo.deinit(allocator); 914 var target_repo = try rp.AnyRepo(.xit, .{}).open(io, allocator, request_repo.source.localInitOpts()); 915 defer target_repo.deinit(io, allocator); 916 917 const id = std.fmt.bytesToHex(parts.thread_id, .lower); 918 const merged = switch (target_repo) { 919 inline else => |*repo| pch.mergeAndRemoveFork(repo.self_repo_opts, io, allocator, server.users_dir, repo, .{ 920 .id = id, 921 .revision = revision, 922 .author = author, 923 .timestamp = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()), 924 }), 925 }; 926 merged catch |err| switch (err) { 927 error.MergeConflict => return request.respond("merge conflict", .{ 928 .status = .conflict, 929 .keep_alive = false, 930 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 931 }), 932 error.MergeCheckUnavailable, error.PatchOutOfDate, error.PatchDataUnavailable => {}, 933 else => return err, 934 }; 935 936 const location = try std.fmt.allocPrint(allocator, "{s}/patch:{s}", .{ parts.repo_base, &id }); 937 defer allocator.free(location); 938 try request.respond("", .{ 939 .status = .see_other, 940 .keep_alive = false, 941 .extra_headers = &.{.{ .name = "location", .value = location }}, 942 }); 943 } 944 945 // create a reply and redirect to its permalink. 946 fn handleCommentNew( 947 io: std.Io, 948 request: *std.http.Server.Request, 949 allocator: std.mem.Allocator, 950 base: []const u8, 951 host: Host, 952 ) !void { 953 const not_found = "comment parent not found"; 954 const parts = commentBaseParts(base) orelse { 955 try request.respond(not_found, .{ 956 .status = .not_found, 957 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 958 }); 959 return; 960 }; 961 962 var author_arena = std.heap.ArenaAllocator.init(allocator); 963 defer author_arena.deinit(); 964 const author = ((try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return).author; 965 966 const form_body = try readFormBody(request, allocator); 967 defer allocator.free(form_body); 968 const body_crlf = (try parseFormField(allocator, form_body, "body")) orelse try allocator.dupe(u8, ""); 969 defer allocator.free(body_crlf); 970 const body = try std.mem.replaceOwned(u8, allocator, body_crlf, "\r\n", "\n"); 971 defer allocator.free(body); 972 973 if (!evt.Comment.fieldsValid(body)) { 974 const form_location = try std.fmt.allocPrint(allocator, "{s}/new", .{base}); 975 defer allocator.free(form_location); 976 try request.respond("", .{ 977 .status = .see_other, 978 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 979 }); 980 return; 981 } 982 983 const thread_id_hex = std.fmt.bytesToHex(parts.thread_id, .lower); 984 const parent_id_hex = std.fmt.bytesToHex(parts.comment_id orelse parts.thread_id, .lower); 985 986 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse { 987 try request.respond(not_found, .{ 988 .status = .not_found, 989 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 990 }); 991 return; 992 }; 993 defer request_repo.deinit(allocator); 994 const source = request_repo.source; 995 var event_id_hex: [evt.event_id_size * 2]u8 = undefined; 996 switch (source.repo_kind) { 997 inline else => |repo_kind| { 998 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 999 defer any_repo.deinit(io, allocator); 1000 switch (any_repo) { 1001 inline else => |*repo| event_id_hex = try evt.Comment.create(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, &thread_id_hex, &parent_id_hex, body, author), 1002 } 1003 }, 1004 } 1005 1006 const location = try std.fmt.allocPrint(allocator, "{s}/{s}:{s}/comment:{s}", .{ parts.repo_base, @tagName(parts.thread_kind), &thread_id_hex, &event_id_hex }); 1007 defer allocator.free(location); 1008 try request.respond("", .{ 1009 .status = .see_other, 1010 .extra_headers = &.{.{ .name = "location", .value = location }}, 1011 }); 1012 } 1013 1014 const AttachmentRequest = struct { 1015 repo_base: []const u8, 1016 id: [evt.event_id_size]u8, 1017 }; 1018 1019 // an attachment url is its repo's base and the attachment's event id 1020 fn attachmentRequest(path: []const u8) ?AttachmentRequest { 1021 const infix = "/attachment:"; 1022 const at = std.mem.lastIndexOf(u8, path, infix) orelse return null; 1023 const tail = path[at + infix.len ..]; 1024 const id = evt.parseEventId(tail) catch return null; 1025 return .{ .repo_base = path[0..at], .id = id }; 1026 } 1027 1028 // serve an attachment's bytes from the repo its url names 1029 fn serveAttachment( 1030 io: std.Io, 1031 request: *std.http.Server.Request, 1032 allocator: std.mem.Allocator, 1033 attachment: AttachmentRequest, 1034 host: Host, 1035 ) !void { 1036 if (!try mayRead(io, allocator, request, host, attachment.repo_base)) return respondAttachmentNotFound(request); 1037 const request_repo = (try requestRepoSource(io, allocator, host, attachment.repo_base)) orelse return respondAttachmentNotFound(request); 1038 defer request_repo.deinit(allocator); 1039 const source = request_repo.source; 1040 switch (source.repo_kind) { 1041 inline else => |repo_kind| { 1042 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1043 defer any_repo.deinit(io, allocator); 1044 switch (any_repo) { 1045 inline else => |*repo| try sendAttachment(repo_kind, repo.self_repo_opts, io, request, allocator, repo, &attachment.id), 1046 } 1047 }, 1048 } 1049 } 1050 1051 fn sendAttachment( 1052 comptime repo_kind: rp.RepoKind, 1053 comptime repo_opts: rp.RepoOpts(repo_kind), 1054 io: std.Io, 1055 request: *std.http.Server.Request, 1056 allocator: std.mem.Allocator, 1057 repo: *rp.Repo(repo_kind, repo_opts), 1058 id: *const [evt.event_id_size]u8, 1059 ) !void { 1060 var arena = std.heap.ArenaAllocator.init(allocator); 1061 defer arena.deinit(); 1062 1063 const DB = evt.EventDB(repo_opts.hash); 1064 var event_db_maybe: ?evt.LocalEventDB(repo_opts.hash) = if (repo_kind == .git) try evt.LocalEventDB(repo_opts.hash).openReadOnly(io, allocator, repo.core.repo_dir) else null; 1065 defer if (event_db_maybe) |*event_db| event_db.deinit(io, allocator); 1066 const haxy_moment = (if (event_db_maybe) |*event_db| 1067 evt.currentMomentFromDb(repo_opts.hash, event_db.db) 1068 else if (repo_kind == .git) 1069 return respondAttachmentNotFound(request) 1070 else 1071 evt.currentMoment(repo_opts, repo)) catch return respondAttachmentNotFound(request); 1072 1073 const record = (try evt.Attachment.readById(DB, repo_opts.hash, haxy_moment, &arena, id)) orelse return respondAttachmentNotFound(request); 1074 if (record.removed) return respondAttachmentNotFound(request); 1075 if (record.blob_oid.len != hash.hexLen(repo_opts.hash)) return respondAttachmentNotFound(request); 1076 const blob_oid: *const [hash.hexLen(repo_opts.hash)]u8 = @ptrCast(record.blob_oid.ptr); 1077 1078 var moment = repo.core.latestMoment() catch return respondAttachmentNotFound(request); 1079 const state = rp.Repo(repo_kind, repo_opts).State(.read_only){ .core = &repo.core, .extra = .{ .moment = &moment } }; 1080 var object_reader = obj.ObjectReader(repo_kind, repo_opts).init(state, io, allocator, blob_oid) catch return respondAttachmentNotFound(request); 1081 defer object_reader.deinit(); 1082 if (object_reader.header().kind != .blob) return respondAttachmentNotFound(request); 1083 1084 const content_type = attachmentContentType(record.name); 1085 const encoded_name = try ui.urlEncodeRef(allocator, record.name); 1086 defer allocator.free(encoded_name); 1087 const disposition = try std.fmt.allocPrint(allocator, "{s}; filename*=UTF-8''{s}", .{ if (content_type == null) "attachment" else "inline", encoded_name }); 1088 defer allocator.free(disposition); 1089 1090 var send_buf: [8192]u8 = undefined; 1091 var body = try request.respondStreaming(&send_buf, .{ 1092 .content_length = object_reader.header().size, 1093 .respond_options = .{ 1094 .extra_headers = &.{ 1095 .{ .name = "content-type", .value = content_type orelse "application/octet-stream" }, 1096 .{ .name = "content-disposition", .value = disposition }, 1097 // uploaded bytes are never sniffed into a type that could run 1098 // as script on this origin 1099 .{ .name = "x-content-type-options", .value = "nosniff" }, 1100 }, 1101 }, 1102 }); 1103 _ = try object_reader.interface.streamRemaining(&body.writer); 1104 try body.end(); 1105 } 1106 1107 // the images a browser renders safely inline. anything else downloads as 1108 // opaque bytes, so an uploaded page can't run on this origin. 1109 fn attachmentContentType(name: []const u8) ?[]const u8 { 1110 const types = [_]struct { ext: []const u8, value: []const u8 }{ 1111 .{ .ext = ".png", .value = "image/png" }, 1112 .{ .ext = ".jpg", .value = "image/jpeg" }, 1113 .{ .ext = ".jpeg", .value = "image/jpeg" }, 1114 .{ .ext = ".gif", .value = "image/gif" }, 1115 .{ .ext = ".webp", .value = "image/webp" }, 1116 }; 1117 for (types) |entry| { 1118 if (name.len > entry.ext.len and std.ascii.eqlIgnoreCase(name[name.len - entry.ext.len ..], entry.ext)) return entry.value; 1119 } 1120 return null; 1121 } 1122 1123 fn respondAttachmentNotFound(request: *std.http.Server.Request) !void { 1124 try request.respond("attachment not found", .{ 1125 .status = .not_found, 1126 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1127 }); 1128 } 1129 1130 fn respondAttachmentParentNotFound(request: *std.http.Server.Request) !void { 1131 try request.respond("attachment parent not found", .{ 1132 .status = .not_found, 1133 .keep_alive = false, 1134 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1135 }); 1136 } 1137 1138 // the upload declares its file's name here, since the body is the file itself 1139 const attachment_name_header = "x-attachment-name"; 1140 1141 const AttachParentParts = struct { 1142 repo_base: []const u8, 1143 kind: evt.EventKind, 1144 id_bytes: [evt.event_id_size]u8, 1145 }; 1146 1147 // what an attachment hangs off: the `<kind>:<id>` segment the form's page ends 1148 // with, whatever kind that is 1149 fn attachParentParts(base: []const u8) ?AttachParentParts { 1150 const segment_at = std.mem.lastIndexOfScalar(u8, base, '/') orelse return null; 1151 const segment = base[segment_at + 1 ..]; 1152 const colon_at = std.mem.lastIndexOfScalar(u8, segment, ':') orelse return null; 1153 const kind = std.meta.stringToEnum(evt.EventKind, segment[0..colon_at]) orelse return null; 1154 const id_bytes = evt.parseEventId(segment[colon_at + 1 ..]) catch return null; 1155 return .{ .repo_base = base[0..segment_at], .kind = kind, .id_bytes = id_bytes }; 1156 } 1157 1158 // attach the uploaded file to the event the url names, then reload. the file is 1159 // the whole request body, so it streams from the socket into the object store 1160 // without being buffered. 1161 fn handleAttach( 1162 io: std.Io, 1163 request: *std.http.Server.Request, 1164 allocator: std.mem.Allocator, 1165 base: []const u8, 1166 host: Host, 1167 ) !void { 1168 const parts = attachParentParts(base) orelse return respondAttachmentParentNotFound(request); 1169 1170 var author_arena = std.heap.ArenaAllocator.init(allocator); 1171 defer author_arena.deinit(); 1172 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1173 const author = actor.author; 1174 // an attachment changes the event it hangs off 1175 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondAttachmentParentNotFound(request); 1176 defer request_repo.deinit(allocator); 1177 const source = request_repo.source; 1178 if (!try source.canModify(io, allocator, actor, parts.kind, &parts.id_bytes)) return respondForbidden(request); 1179 1180 const name = (try attachmentName(allocator, request)) orelse return respondUploadError(request, .bad_request, "attachment needs a name"); 1181 defer allocator.free(name); 1182 if (!evt.Attachment.nameValid(name)) return respondUploadError(request, .bad_request, "invalid attachment name"); 1183 1184 const size = request.head.content_length orelse return respondUploadError(request, .length_required, "attachments must declare a content length"); 1185 if (size == 0) return respondUploadError(request, .bad_request, "attachment is empty"); 1186 if (size > evt.Attachment.max_size) return respondUploadError(request, .payload_too_large, "attachment is too large"); 1187 1188 const parent_id_hex = std.fmt.bytesToHex(parts.id_bytes, .lower); 1189 1190 var body_buf: [4096]u8 = undefined; 1191 const blob: evt.Blob = .{ .name = name, .size = size, .reader = try request.readerExpectContinue(&body_buf) }; 1192 1193 switch (source.repo_kind) { 1194 inline else => |repo_kind| { 1195 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1196 defer any_repo.deinit(io, allocator); 1197 switch (any_repo) { 1198 inline else => |*repo| _ = evt.Attachment.create(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, &parent_id_hex, blob, author) catch |err| switch (err) { 1199 error.ParentNotFound => return respondAttachmentParentNotFound(request), 1200 else => return err, 1201 }, 1202 } 1203 }, 1204 } 1205 1206 // the client reloads the page itself 1207 try request.respond("", .{ .status = .no_content, .keep_alive = false }); 1208 } 1209 1210 // the name the upload declares for its file, percent-encoded so it survives a 1211 // header 1212 fn attachmentName(allocator: std.mem.Allocator, request: *std.http.Server.Request) !?[]u8 { 1213 var iter = request.iterateHeaders(); 1214 while (iter.next()) |header| { 1215 if (!std.ascii.eqlIgnoreCase(header.name, attachment_name_header)) continue; 1216 return try decodeFormValue(allocator, header.value); 1217 } 1218 return null; 1219 } 1220 1221 // an upload that failed leaves the body partly read, so the connection closes 1222 fn respondUploadError(request: *std.http.Server.Request, status: std.http.Status, message: []const u8) !void { 1223 try request.respond(message, .{ 1224 .status = status, 1225 .keep_alive = false, 1226 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1227 }); 1228 } 1229 1230 // re-emit the comment `parts` names with a new body, in the repo the host 1231 // resolves the base to. 1232 fn updateComment( 1233 io: std.Io, 1234 allocator: std.mem.Allocator, 1235 host: Host, 1236 parts: CommentBaseParts, 1237 body: []const u8, 1238 author: evt.CommitAuthor, 1239 ) !void { 1240 const comment_id = parts.comment_id orelse return error.NotFound; 1241 const thread_id = std.fmt.bytesToHex(parts.thread_id, .lower); 1242 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return error.NotFound; 1243 defer request_repo.deinit(allocator); 1244 const source = request_repo.source; 1245 switch (source.repo_kind) { 1246 inline else => |repo_kind| { 1247 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1248 defer any_repo.deinit(io, allocator); 1249 switch (any_repo) { 1250 inline else => |*repo| try evt.Comment.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, &thread_id, &comment_id, body, author), 1251 } 1252 }, 1253 } 1254 } 1255 1256 // edit actions share a suffix; the base identifies the event being edited. 1257 fn handleEdit( 1258 io: std.Io, 1259 request: *std.http.Server.Request, 1260 allocator: std.mem.Allocator, 1261 base: []const u8, 1262 host: Host, 1263 ) !void { 1264 const parts = commentBaseParts(base) orelse return respondRemoveNotFound(request); 1265 if (parts.comment_id != null) return handleCommentEdit(io, request, allocator, base, host, parts); 1266 return handleThreadEdit(io, request, allocator, base, host, parts); 1267 } 1268 1269 // replace the body of the comment the url names, then redirect to its 1270 // permalink. 1271 fn handleCommentEdit( 1272 io: std.Io, 1273 request: *std.http.Server.Request, 1274 allocator: std.mem.Allocator, 1275 base: []const u8, 1276 host: Host, 1277 parts: CommentBaseParts, 1278 ) !void { 1279 var author_arena = std.heap.ArenaAllocator.init(allocator); 1280 defer author_arena.deinit(); 1281 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1282 const author = actor.author; 1283 // edits only reach here for a comment 1284 const comment_id = parts.comment_id orelse unreachable; 1285 { 1286 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1287 defer request_repo.deinit(allocator); 1288 if (!try request_repo.source.canModify(io, allocator, actor, .comment, &comment_id)) return respondForbidden(request); 1289 } 1290 1291 const form_body = try readFormBody(request, allocator); 1292 defer allocator.free(form_body); 1293 const body_crlf = (try parseFormField(allocator, form_body, "body")) orelse try allocator.dupe(u8, ""); 1294 defer allocator.free(body_crlf); 1295 const body = try std.mem.replaceOwned(u8, allocator, body_crlf, "\r\n", "\n"); 1296 defer allocator.free(body); 1297 1298 if (!evt.Comment.fieldsValid(body)) { 1299 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1300 defer allocator.free(form_location); 1301 try request.respond("", .{ 1302 .status = .see_other, 1303 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1304 }); 1305 return; 1306 } 1307 1308 const not_found = "comment not found"; 1309 updateComment(io, allocator, host, parts, body, author) catch |err| switch (err) { 1310 error.NotFound => { 1311 try request.respond(not_found, .{ 1312 .status = .not_found, 1313 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1314 }); 1315 return; 1316 }, 1317 else => |e| return e, 1318 }; 1319 1320 try request.respond("", .{ 1321 .status = .see_other, 1322 .extra_headers = &.{.{ .name = "location", .value = base }}, 1323 }); 1324 } 1325 1326 fn updateThread( 1327 comptime Event: type, 1328 io: std.Io, 1329 allocator: std.mem.Allocator, 1330 host: Host, 1331 repo_base: []const u8, 1332 id: *const [evt.event_id_size]u8, 1333 update: Event.Update, 1334 author: evt.CommitAuthor, 1335 ) !void { 1336 const request_repo = (try requestRepoSource(io, allocator, host, repo_base)) orelse return error.NotFound; 1337 defer request_repo.deinit(allocator); 1338 const source = request_repo.source; 1339 switch (source.repo_kind) { 1340 inline else => |repo_kind| { 1341 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1342 defer any_repo.deinit(io, allocator); 1343 switch (any_repo) { 1344 inline else => |*repo| try Event.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, id, update, author), 1345 } 1346 }, 1347 } 1348 } 1349 1350 const RemoveParts = struct { 1351 repo_base: []const u8, 1352 kind: evt.EventKind, 1353 id: [evt.event_id_size]u8, 1354 }; 1355 1356 // split a remove url into the repo and event it names 1357 fn removeParts(base: []const u8) ?RemoveParts { 1358 if (attachmentRequest(base)) |attachment| { 1359 const parent = attachParentParts(attachment.repo_base) orelse return null; 1360 return .{ 1361 .repo_base = parent.repo_base, 1362 .kind = .attach, 1363 .id = attachment.id, 1364 }; 1365 } 1366 if (commentBaseParts(base)) |thread| return .{ 1367 .repo_base = thread.repo_base, 1368 .kind = if (thread.comment_id != null) .comment else thread.thread_kind, 1369 .id = thread.comment_id orelse thread.thread_id, 1370 }; 1371 return null; 1372 } 1373 1374 // remove the event named by the form's url 1375 fn handleRemove( 1376 io: std.Io, 1377 request: *std.http.Server.Request, 1378 allocator: std.mem.Allocator, 1379 base: []const u8, 1380 host: Host, 1381 ) !void { 1382 const parts = removeParts(base) orelse return respondRemoveNotFound(request); 1383 1384 var author_arena = std.heap.ArenaAllocator.init(allocator); 1385 defer author_arena.deinit(); 1386 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1387 const author = actor.author; 1388 1389 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1390 defer request_repo.deinit(allocator); 1391 const source = request_repo.source; 1392 1393 if (parts.kind == .patch) switch (host) { 1394 .server => |server| { 1395 const user_id = actor.user_id orelse return respondLoginRequired(request); 1396 1397 // a draft lives in its author's user repo 1398 if (try evt.readForkById(io, allocator, &author_arena, server.users_dir, &user_id, &parts.id)) |fork_record| { 1399 const repo_id = evt.parseEventId(std.fs.path.basename(source.path)) catch return respondRemoveNotFound(request); 1400 if (!fork_record.removed and fork_record.event.stage == .draft and std.mem.eql(u8, fork_record.event.repo_id, &repo_id)) { 1401 const id = std.fmt.bytesToHex(parts.id, .lower); 1402 try fork.remove(io, allocator, server.users_dir, &user_id, &id, author); 1403 1404 const location = try std.fmt.allocPrint(allocator, "{s}/patches/drafts", .{parts.repo_base}); 1405 defer allocator.free(location); 1406 try request.respond("", .{ 1407 .status = .see_other, 1408 .keep_alive = false, 1409 .extra_headers = &.{.{ .name = "location", .value = location }}, 1410 }); 1411 return; 1412 } 1413 } 1414 }, 1415 .local => {}, 1416 }; 1417 1418 // a draft is its author's alone, which its removal above checks 1419 if (!try source.canModify(io, allocator, actor, parts.kind, &parts.id)) return respondForbidden(request); 1420 1421 switch (source.repo_kind) { 1422 inline else => |repo_kind| { 1423 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1424 defer any_repo.deinit(io, allocator); 1425 switch (any_repo) { 1426 inline else => |*repo| evt.remove(host.event(), .repo, repo_kind, repo.self_repo_opts, io, allocator, repo, &parts.id, parts.kind, author) catch |err| switch (err) { 1427 error.EventNotFound => return respondRemoveNotFound(request), 1428 else => |e| return e, 1429 }, 1430 } 1431 }, 1432 } 1433 1434 const id = std.fmt.bytesToHex(parts.id, .lower); 1435 const location = try std.fmt.allocPrint(allocator, "{s}/event:{s}/kind:{s}", .{ parts.repo_base, &id, @tagName(parts.kind) }); 1436 defer allocator.free(location); 1437 try request.respond("", .{ 1438 .status = .see_other, 1439 .keep_alive = false, 1440 .extra_headers = &.{.{ .name = "location", .value = location }}, 1441 }); 1442 } 1443 1444 fn respondRemoveNotFound(request: *std.http.Server.Request) !void { 1445 try request.respond("event not found", .{ 1446 .status = .not_found, 1447 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1448 }); 1449 } 1450 1451 fn updateDiscussion( 1452 io: std.Io, 1453 allocator: std.mem.Allocator, 1454 host: Host, 1455 repo_base: []const u8, 1456 id: *const [evt.event_id_size]u8, 1457 title: []const u8, 1458 labels: []const u8, 1459 description: []const u8, 1460 author: evt.CommitAuthor, 1461 ) !void { 1462 const request_repo = (try requestRepoSource(io, allocator, host, repo_base)) orelse return error.NotFound; 1463 defer request_repo.deinit(allocator); 1464 const source = request_repo.source; 1465 switch (source.repo_kind) { 1466 inline else => |repo_kind| { 1467 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1468 defer any_repo.deinit(io, allocator); 1469 switch (any_repo) { 1470 inline else => |*repo| try evt.Discussion.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, id, title, labels, description, author), 1471 } 1472 }, 1473 } 1474 } 1475 1476 // set the status of the issue the url names (base is 1477 // "/repo/<owner>/<name>/issue:<id>", identity elided in local mode) by 1478 // re-emitting its event, then redirect back to it 1479 fn handleThreadStatus( 1480 io: std.Io, 1481 request: *std.http.Server.Request, 1482 allocator: std.mem.Allocator, 1483 base: []const u8, 1484 host: Host, 1485 open: bool, 1486 ) !void { 1487 const not_found = "thread not found"; 1488 const parts = commentBaseParts(base) orelse { 1489 try request.respond(not_found, .{ 1490 .status = .not_found, 1491 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1492 }); 1493 return; 1494 }; 1495 1496 var author_arena = std.heap.ArenaAllocator.init(allocator); 1497 defer author_arena.deinit(); 1498 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1499 const author = actor.author; 1500 { 1501 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1502 defer request_repo.deinit(allocator); 1503 if (!try request_repo.source.canModify(io, allocator, actor, parts.thread_kind, &parts.thread_id)) return respondForbidden(request); 1504 } 1505 1506 (switch (parts.thread_kind) { 1507 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .status = if (open) .open else .closed }, author), 1508 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .status = if (open) .open else .closed }, author), 1509 else => return respondRemoveNotFound(request), 1510 }) catch |err| switch (err) { 1511 error.NotFound => { 1512 try request.respond(not_found, .{ 1513 .status = .not_found, 1514 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1515 }); 1516 return; 1517 }, 1518 else => |e| return e, 1519 }; 1520 1521 // like logout, this is a bodyless POST, so close the connection rather than 1522 // letting the keep-alive path try to discard a body that isn't framed. 1523 try request.respond("", .{ 1524 .status = .see_other, 1525 .keep_alive = false, 1526 .extra_headers = &.{.{ .name = "location", .value = base }}, 1527 }); 1528 } 1529 1530 // replace a thread's editable fields. 1531 fn handleThreadEdit( 1532 io: std.Io, 1533 request: *std.http.Server.Request, 1534 allocator: std.mem.Allocator, 1535 base: []const u8, 1536 host: Host, 1537 parts: CommentBaseParts, 1538 ) !void { 1539 var author_arena = std.heap.ArenaAllocator.init(allocator); 1540 defer author_arena.deinit(); 1541 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1542 const author = actor.author; 1543 1544 const body = try readFormBody(request, allocator); 1545 defer allocator.free(body); 1546 1547 const title = (try parseFormField(allocator, body, "title")) orelse try allocator.dupe(u8, ""); 1548 defer allocator.free(title); 1549 const labels = (try parseFormField(allocator, body, "labels")) orelse try allocator.dupe(u8, ""); 1550 defer allocator.free(labels); 1551 const description_crlf = (try parseFormField(allocator, body, "description")) orelse try allocator.dupe(u8, ""); 1552 defer allocator.free(description_crlf); 1553 // form submission normalizes textarea line breaks to CRLF; store plain 1554 // newlines so the text renders the same on every host 1555 const description = try std.mem.replaceOwned(u8, allocator, description_crlf, "\r\n", "\n"); 1556 defer allocator.free(description); 1557 const target_branch = (try parseFormField(allocator, body, "target_branch")) orelse try allocator.dupe(u8, ""); 1558 defer allocator.free(target_branch); 1559 1560 // invalid fields send the user back to the edit form 1561 const valid = switch (parts.thread_kind) { 1562 .issue => evt.Issue.fieldsValid(title, labels), 1563 .patch => evt.Patch.fieldsValid(title, labels), 1564 .discuss => evt.Discussion.fieldsValid(title, labels), 1565 else => unreachable, 1566 }; 1567 if (!valid) { 1568 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1569 defer allocator.free(form_location); 1570 if (!evt.titleValid(title)) { 1571 return respondThreadFormFailure(request, allocator, host, form_location, requiredTitleFeedback(parts.thread_kind, title, labels, description, target_branch, null)); 1572 } 1573 try request.respond("", .{ 1574 .status = .see_other, 1575 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1576 }); 1577 return; 1578 } 1579 1580 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1581 defer request_repo.deinit(allocator); 1582 1583 const draft_user_id = if (parts.thread_kind == .patch) actor.user_id else null; 1584 if (draft_user_id) |user_id| { 1585 const server = switch (host) { 1586 .server => |server| server, 1587 .local => unreachable, 1588 }; 1589 if (!evt.Patch.branchValid(target_branch) or !try request_repo.source.hasBranch(io, allocator, target_branch)) { 1590 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1591 defer allocator.free(form_location); 1592 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(.invalid_target_branch, title, labels, description, target_branch, null)); 1593 } 1594 const repo_id = evt.parseEventId(std.fs.path.basename(request_repo.source.path)) catch return respondRemoveNotFound(request); 1595 var admin_repo = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1596 defer admin_repo.deinit(io, allocator); 1597 const id = std.fmt.bytesToHex(parts.thread_id, .lower); 1598 if (try pch.editDraft(.{}, io, allocator, server.users_dir, &admin_repo, .{ 1599 .id = id, 1600 .user_id = user_id, 1601 .repo_id = repo_id, 1602 .title = title, 1603 .labels = labels, 1604 .description = description, 1605 .target_branch = target_branch, 1606 .author = author, 1607 .timestamp = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()), 1608 })) { 1609 try request.respond("", .{ 1610 .status = .see_other, 1611 .extra_headers = &.{.{ .name = "location", .value = base }}, 1612 }); 1613 return; 1614 } 1615 } 1616 1617 // a draft is its author's alone, which its edit above checks 1618 if (!try request_repo.source.canModify(io, allocator, actor, parts.thread_kind, &parts.thread_id)) return respondForbidden(request); 1619 1620 const not_found = switch (parts.thread_kind) { 1621 .issue => "issue not found", 1622 .patch => "patch not found", 1623 .discuss => "discussion not found", 1624 else => unreachable, 1625 }; 1626 (switch (parts.thread_kind) { 1627 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .fields = .{ 1628 .title = title, 1629 .labels = labels, 1630 .description = description, 1631 } }, author), 1632 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .fields = .{ 1633 .title = title, 1634 .labels = labels, 1635 .description = description, 1636 .target_branch = target_branch, 1637 } }, author), 1638 .discuss => updateDiscussion(io, allocator, host, parts.repo_base, &parts.thread_id, title, labels, description, author), 1639 else => unreachable, 1640 }) catch |err| switch (err) { 1641 error.NotFound => { 1642 try request.respond(not_found, .{ 1643 .status = .not_found, 1644 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1645 }); 1646 return; 1647 }, 1648 else => { 1649 if (parts.thread_kind != .patch) return err; 1650 const failure = ui.Session.FormFeedback.PatchFailure.fromError(err) orelse return err; 1651 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1652 defer allocator.free(form_location); 1653 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(failure, title, labels, description, target_branch, null)); 1654 }, 1655 }; 1656 1657 try request.respond("", .{ 1658 .status = .see_other, 1659 .extra_headers = &.{.{ .name = "location", .value = base }}, 1660 }); 1661 } 1662 1663 // resolve every conflicted field of the thread the url names 1664 fn handleThreadResolve( 1665 io: std.Io, 1666 request: *std.http.Server.Request, 1667 allocator: std.mem.Allocator, 1668 base: []const u8, 1669 host: Host, 1670 ) !void { 1671 const parts = commentBaseParts(base) orelse { 1672 try request.respond("thread not found", .{ 1673 .status = .not_found, 1674 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1675 }); 1676 return; 1677 }; 1678 1679 var author_arena = std.heap.ArenaAllocator.init(allocator); 1680 defer author_arena.deinit(); 1681 const author = ((try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .write)) orelse return).author; 1682 1683 const body = try readFormBody(request, allocator); 1684 defer allocator.free(body); 1685 1686 var field_arena = std.heap.ArenaAllocator.init(allocator); 1687 defer field_arena.deinit(); 1688 const aa = field_arena.allocator(); 1689 const title = try parseFormField(aa, body, "title"); 1690 const labels = try parseFormField(aa, body, "labels"); 1691 1692 // the hunk inputs are submitted as d0, d1, ...; form submission normalizes their 1693 // textarea line breaks to CRLF 1694 var hunks: std.ArrayList([]const u8) = .empty; 1695 var hunk_index: usize = 0; 1696 while (true) : (hunk_index += 1) { 1697 const name = try std.fmt.allocPrint(aa, "d{d}", .{hunk_index}); 1698 const submitted = (try parseFormField(aa, body, name)) orelse break; 1699 try hunks.append(aa, try std.mem.replaceOwned(u8, aa, submitted, "\r\n", "\n")); 1700 } 1701 1702 if (parts.comment_id != null or (parts.thread_kind != .issue and parts.thread_kind != .patch)) { 1703 try request.respond("thread not found", .{ 1704 .status = .not_found, 1705 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1706 }); 1707 return; 1708 } 1709 const route = ui.RoutablePage.fromUrl(base) orelse ui.RoutablePage.fromUrlLocal(base) orelse { 1710 try request.respond("thread not found", .{ 1711 .status = .not_found, 1712 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1713 }); 1714 return; 1715 }; 1716 const theirs: []const u8 = switch (route) { 1717 .repo_patches => |*patch| patch.theirs.slice(), 1718 .repo_issues => "", 1719 else => unreachable, 1720 }; 1721 const not_found = if (parts.thread_kind == .patch) "patch not found" else "issue not found"; 1722 1723 (switch (parts.thread_kind) { 1724 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1725 .title = title, 1726 .labels = labels, 1727 .hunks = hunks.items, 1728 } }, author), 1729 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1730 .title = title, 1731 .labels = labels, 1732 .hunks = hunks.items, 1733 .theirs = theirs, 1734 } }, author), 1735 else => unreachable, 1736 }) catch |err| switch (err) { 1737 error.NotFound => { 1738 try request.respond(not_found, .{ 1739 .status = .not_found, 1740 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1741 }); 1742 return; 1743 }, 1744 // invalid fields send the user back to the resolve form 1745 error.InvalidFields => { 1746 const form_location = try std.fmt.allocPrint(allocator, "{s}/resolve", .{base}); 1747 defer allocator.free(form_location); 1748 try request.respond("", .{ 1749 .status = .see_other, 1750 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1751 }); 1752 return; 1753 }, 1754 else => |e| return e, 1755 }; 1756 1757 try request.respond("", .{ 1758 .status = .see_other, 1759 .extra_headers = &.{.{ .name = "location", .value = base }}, 1760 }); 1761 } 1762 1763 // the posted path drops the action's own segment, so the route it parses is 1764 // the undo page the action applies to, never the confirmation page itself 1765 fn handleUndo(io: std.Io, request: *std.http.Server.Request, allocator: std.mem.Allocator, base: []const u8, host: Host, action: enum { undo, clear }) !void { 1766 const route = (switch (host) { 1767 .local => ui.RoutablePage.fromUrlLocal(base), 1768 .server => ui.RoutablePage.fromUrl(base), 1769 }) orelse return respondRepoNotFound(request); 1770 if (route != .repo_undo) return respondRepoNotFound(request); 1771 const target = route.repo_undo; 1772 var arena = std.heap.ArenaAllocator.init(allocator); 1773 defer arena.deinit(); 1774 const repo_base = if (target.name.len == 0) "" else try std.fmt.allocPrint(arena.allocator(), "/repo/{s}", .{target.name.slice()}); 1775 _ = (try authorizeWrite(io, allocator, &arena, request, host, repo_base, .owner)) orelse return; 1776 const resolved = (try requestRepoSource(io, allocator, host, repo_base)) orelse return respondRepoNotFound(request); 1777 defer resolved.deinit(allocator); 1778 (switch (action) { 1779 .undo => ui.Repo.Undo.execute(io, allocator, resolved.source, target.index orelse return respondRepoNotFound(request)), 1780 .clear => ui.Repo.Undo.clearHistory(io, allocator, resolved.source), 1781 }) catch |err| switch (err) { 1782 error.NotFound, error.InvalidHistoryIndex, error.TransactionNotFound => return respondRepoNotFound(request), 1783 else => return err, 1784 }; 1785 const location = try (ui.RoutablePage.repoUndoRoute(target.name.slice(), null) orelse return error.RouteTooLong).toUrl(&arena); 1786 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = location }} }); 1787 } 1788 1789 fn handleSync( 1790 io: std.Io, 1791 request: *std.http.Server.Request, 1792 allocator: std.mem.Allocator, 1793 base: []const u8, 1794 source: ui.RepoSource, 1795 ) !void { 1796 if (base.len != 0) { 1797 try request.respond("not found", .{ 1798 .status = .not_found, 1799 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1800 }); 1801 return; 1802 } 1803 1804 var owned_failure: ?[]u8 = null; 1805 defer if (owned_failure) |message| allocator.free(message); 1806 const failure: ?[]const u8 = blk: { 1807 owned_failure = ui.Repo.Events.sync(io, allocator, source) catch |err| break :blk @errorName(err); 1808 break :blk owned_failure; 1809 }; 1810 if (failure) |message| { 1811 var encoded: std.Io.Writer.Allocating = .init(allocator); 1812 defer encoded.deinit(); 1813 try std.Uri.Component.percentEncode(&encoded.writer, message, struct { 1814 fn isUnreserved(c: u8) bool { 1815 return std.ascii.isAlphanumeric(c) or c == '-' or c == '.' or c == '_' or c == '~'; 1816 } 1817 }.isUnreserved); 1818 const cookie = try std.fmt.allocPrint( 1819 allocator, 1820 local_flash_cookie ++ "=" ++ local_sync_failure_prefix ++ "{s}; Path=/; HttpOnly; SameSite=Strict", 1821 .{encoded.written()}, 1822 ); 1823 defer allocator.free(cookie); 1824 try request.respond("", .{ 1825 .status = .see_other, 1826 .extra_headers = &.{ 1827 .{ .name = "location", .value = "/events" }, 1828 .{ .name = "set-cookie", .value = cookie }, 1829 }, 1830 }); 1831 return; 1832 } 1833 1834 try request.respond("", .{ 1835 .status = .see_other, 1836 .extra_headers = &.{ 1837 .{ .name = "location", .value = "/events" }, 1838 .{ .name = "set-cookie", .value = local_flash_cookie ++ "=; Path=/; Max-Age=0" }, 1839 }, 1840 }); 1841 } 1842 1843 fn renderIndexHtml( 1844 io: std.Io, 1845 allocator: std.mem.Allocator, 1846 host: Host, 1847 session_token: ?[]const u8, 1848 session_data: ui.Session.Data, 1849 ) ![]const u8 { 1850 const template = (findEmbed("/index.html") orelse return error.MissingIndexAsset).body; 1851 1852 var page_arena = std.heap.ArenaAllocator.init(allocator); 1853 defer page_arena.deinit(); 1854 1855 // the server admin repo must outlive the page build, since the session's 1856 // moment reads from it. 1857 var repo_maybe: ?rp.Repo(.xit, evt.admin_repo_opts) = null; 1858 defer if (repo_maybe) |*repo| repo.deinit(io, allocator); 1859 1860 var session = switch (host) { 1861 .server => |server| blk: { 1862 // open the admin repo to read live user/repo data. 1863 repo_maybe = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1864 const repo = if (repo_maybe) |*repo| repo else unreachable; 1865 var session = try ui.Session.init(&page_arena, repo, session_data); 1866 // the session dropped a user whose account was removed, so revoke 1867 // the token that named them 1868 if (session_token) |token| { 1869 if (session.data.user_id == null) server.session_store.remove(token); 1870 } 1871 // give the page builders filesystem access to the on-disk repos (a 1872 // sibling "users" dir next to the admin repo) so the Repo page can 1873 // read its files. 1874 session.users_dir = server.users_dir; 1875 break :blk session; 1876 }, 1877 .local => |local| ui.Session{ 1878 .data = session_data, 1879 .arena = &page_arena, 1880 .page_arena = &page_arena, 1881 .local = local, 1882 }, 1883 }; 1884 session.io = io; 1885 1886 var page = try ui.Page.init(session.page_arena, &session, session.data.current_page); 1887 var root = try ui.initRoot(allocator, &page, &session); 1888 defer root.deinit(allocator); 1889 1890 const snapshot: ui.Snapshot = .{ .page = page, .session = session.data }; 1891 1892 const content = try generateHtml(allocator, &root, &session); 1893 defer allocator.free(content); 1894 1895 // serialize the snapshot so the wasm side can parse it back without making 1896 // a second request. it's embedded raw in a <script type="application/json"> 1897 // block, whose content is raw text terminated only by "</script". in json, 1898 // '<' appears solely inside string values, so escaping every '<' (and '>' 1899 // for good measure) to its \uXXXX form yields equivalent json that can't 1900 // break out of the tag. 1901 var json: std.Io.Writer.Allocating = .init(allocator); 1902 defer json.deinit(); 1903 try std.json.Stringify.value(snapshot, .{}, &json.writer); 1904 1905 var json_escaped: std.ArrayList(u8) = .empty; 1906 defer json_escaped.deinit(allocator); 1907 for (json.written()) |c| switch (c) { 1908 '<' => try json_escaped.appendSlice(allocator, "\\u003c"), 1909 '>' => try json_escaped.appendSlice(allocator, "\\u003e"), 1910 else => try json_escaped.append(allocator, c), 1911 }; 1912 1913 var out: std.ArrayList(u8) = .empty; 1914 errdefer out.deinit(allocator); 1915 { 1916 var cursor: usize = 0; 1917 for (&[_]struct { needle: []const u8, replacement: []const u8 }{ 1918 .{ .needle = "{{{ HAXY_HTML }}}", .replacement = content }, 1919 .{ .needle = "{{{ HAXY_JSON }}}", .replacement = json_escaped.items }, 1920 }) |sub| { 1921 const idx = std.mem.indexOfPos(u8, template, cursor, sub.needle) orelse return error.MissingTemplateToken; 1922 try out.appendSlice(allocator, template[cursor..idx]); 1923 try out.appendSlice(allocator, sub.replacement); 1924 cursor = idx + sub.needle.len; 1925 } 1926 try out.appendSlice(allocator, template[cursor..]); 1927 } 1928 return try out.toOwnedSlice(allocator); 1929 } 1930 1931 fn findEmbed(request_path: []const u8) ?Embed { 1932 const path = if (std.mem.eql(u8, request_path, "/")) 1933 "index.html" 1934 else if (request_path.len > 1 and request_path[0] == '/') 1935 request_path[1..] 1936 else 1937 return null; 1938 1939 for (embeds) |embed| { 1940 if (std.mem.eql(u8, path, embed.path)) return embed; 1941 } 1942 return null; 1943 } 1944 1945 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 1946 // own absolutely-positioned, natively-scrollable <div> holding its full content, 1947 // rendered recursively so nested scrolls work. 1948 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 1949 const grid = root.getGrid() orelse return error.MissingGrid; 1950 const root_focus = root.getFocus(); 1951 1952 var out: std.ArrayList(u8) = .empty; 1953 errdefer out.deinit(allocator); 1954 1955 switch (root.*) { 1956 .background => |*background| { 1957 if (background.art.getGrid()) |art| { 1958 var position_buf: [64]u8 = undefined; 1959 try out.appendSlice(allocator, try std.fmt.bufPrint(&position_buf, "<div class=\"ansi-art\" aria-hidden=\"true\" style=\"left:{d}ch\">", .{grid.size.width -| art.size.width})); 1960 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 1961 try out.appendSlice(allocator, "</div>"); 1962 } 1963 }, 1964 else => {}, 1965 } 1966 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 1967 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 1968 try out.appendSlice(allocator, "</div>"); 1969 try renderForms(allocator, &out, root_focus); 1970 return try out.toOwnedSlice(allocator); 1971 } 1972 1973 // render one panel — a focus subtree and its content grid — as HTML, recursing 1974 // once per web-native Scroll inside it. the root panel is the whole page; each 1975 // Scroll becomes a nested, natively-scrollable div holding its full content. 1976 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 1977 // then the child scroll divs over those holes. 1978 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 1979 // `direct` is this panel's scroll children, each drawn as an overlaid div. 1980 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 1981 // plus their descendants, which the focus tree flattens into this panel's 1982 // children): the cell hit-test below skips them so this panel doesn't claim 1983 // cells that are really rendered inside a child scroll's own panel. 1984 // (scrolls aren't nested in practice, so every scroll child is direct here.) 1985 var direct: std.ArrayList(usize) = .empty; 1986 defer direct.deinit(allocator); 1987 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 1988 defer excluded.deinit(allocator); 1989 { 1990 var it = focus.children.iterator(); 1991 while (it.next()) |e| { 1992 if (e.value_ptr.focus.scroll == null) continue; 1993 try direct.append(allocator, e.key_ptr.*); 1994 try excluded.put(allocator, e.key_ptr.*, {}); 1995 var mit = e.value_ptr.focus.children.iterator(); 1996 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 1997 } 1998 } 1999 2000 // the HTML element a run of cells is wrapped in, chosen from the cell's 2001 // focusable kind 2002 const CellTag = union(enum) { 2003 span, // clickable focusable cell 2004 a: []const u8, // clickable focusable link 2005 plain, // non-focusable, colored 2006 2007 const a_prefix = "a:"; 2008 // an "in-page" anchor: rendered as a real <a href> so it works with js 2009 // disabled, but wasm handles it without navigating. 2010 fn init(str: []const u8) @This() { 2011 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2012 return .{ .a = str[ui.raw_link_prefix.len..] }; 2013 } 2014 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2015 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2016 } 2017 if (std.mem.startsWith(u8, str, a_prefix)) { 2018 return .{ .a = str[a_prefix.len..] }; 2019 } 2020 return .span; 2021 } 2022 2023 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2024 var id_buf: [32]u8 = undefined; 2025 switch (self) { 2026 .span => { 2027 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2028 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2029 try out.appendSlice(alloc, "\""); 2030 try out.appendSlice(alloc, style_attr); 2031 try out.appendSlice(alloc, ">"); 2032 }, 2033 .a => |href| { 2034 // tabindex=-1 keeps these out of the browser's tab order 2035 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2036 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2037 try out.appendSlice(alloc, "\" href=\""); 2038 try appendEscapedHtml(alloc, out, href); 2039 try out.appendSlice(alloc, "\""); 2040 try out.appendSlice(alloc, style_attr); 2041 try out.appendSlice(alloc, ">"); 2042 }, 2043 .plain => { 2044 try out.appendSlice(alloc, "<span"); 2045 try out.appendSlice(alloc, style_attr); 2046 try out.appendSlice(alloc, ">"); 2047 }, 2048 } 2049 } 2050 2051 fn closeTag(self: @This()) []const u8 { 2052 return switch (self) { 2053 .span, .plain => "</span>", 2054 .a => "</a>", 2055 }; 2056 } 2057 }; 2058 2059 // the focusable owning each cell, among this panel's own (skipping any 2060 // that belong to a child scroll, whose cells are drawn in their own panel). 2061 // claimed in focus order, so the first focusable over a cell keeps it. 2062 // looking every focusable up for every cell is quadratic in a long list. 2063 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2064 defer allocator.free(owners); 2065 @memset(owners, null); 2066 { 2067 var it = focus.children.iterator(); 2068 while (it.next()) |entry| { 2069 const child = entry.value_ptr.*; 2070 if (child.focus.mode != .all) continue; 2071 if (excluded.contains(entry.key_ptr.*)) continue; 2072 const r = child.rect; 2073 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2074 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2075 const owner = &owners[y * grid.size.width + x]; 2076 if (owner.* == null) owner.* = entry.key_ptr.*; 2077 } 2078 } 2079 } 2080 } 2081 2082 // the cells are the volatile part of a panel. js replaces this one subtree 2083 // wholesale while retaining the panel's native controls and scroll shells. 2084 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2085 2086 // emit this panel's grid as rows of text, coalescing adjacent cells that 2087 // share a focus id and style into one tag (a clickable span, a link, or a 2088 // plain styled span). cells under a child scroll keep only their background. 2089 // a cell's own link is an anchor nested in that tag. 2090 for (0..grid.size.height) |y| { 2091 var cur_id: ?usize = null; 2092 var cur_style: Grid.Style = .{}; 2093 var open_tag: ?CellTag = null; 2094 var open_link: ?[]const u8 = null; 2095 var first = true; 2096 for (0..grid.size.width) |x| { 2097 const cell = (try grid.cell(x, y)).*; 2098 // a cell covered by a child scroll's viewport is drawn by that scroll's 2099 // own div, so blank its glyph and make it non-clickable here — but keep 2100 // its background, so the backdrop still shows through the scroll's 2101 // transparent div instead of a bare hole. 2102 const covered_by_scroll = blk: { 2103 for (direct.items) |id| { 2104 const r = (focus.children.get(id) orelse continue).rect; 2105 if (x >= r.x and y >= r.y and x < r.x + r.size.width and y < r.y + r.size.height) break :blk true; 2106 } 2107 break :blk false; 2108 }; 2109 // the focusable owning the cell at (x, y); none for a covered cell. 2110 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2111 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2112 2113 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2114 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2115 open_link = null; 2116 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2117 2118 var new_tag: ?CellTag = null; 2119 if (cell_id) |id| { 2120 if (focus.children.get(id)) |child| { 2121 new_tag = switch (child.focus.kind) { 2122 .custom => |custom| CellTag.init(custom), 2123 else => .span, 2124 }; 2125 } 2126 } 2127 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2128 2129 if (new_tag) |t| { 2130 var style_buf: [192]u8 = undefined; 2131 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2132 } 2133 2134 open_tag = new_tag; 2135 cur_id = cell_id; 2136 cur_style = style; 2137 first = false; 2138 } 2139 2140 // an anchor can't nest in another, so a link tag's cells skip theirs 2141 const in_anchor = if (open_tag) |t| t == .a else false; 2142 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2143 if (!sameLink(link, open_link)) { 2144 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2145 if (link) |url| { 2146 try output.appendSlice(allocator, "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2147 try appendEscapedHtml(allocator, output, url); 2148 try output.appendSlice(allocator, "\">"); 2149 } 2150 open_link = link; 2151 } 2152 2153 if (covered_by_scroll) { 2154 try appendEscapedHtml(allocator, output, " "); 2155 } else if (cell.continuation) { 2156 // the wide rune to the left was emitted 2ch wide, covering this column 2157 } else if (cell.rune) |rune| { 2158 var encoded: [4]u8 = undefined; 2159 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2160 const rune_text = encoded[0..encoded_len]; 2161 // a double-width rune is pinned inside a 2ch span so the 2162 // fallback glyph's advance width can't shift the rest of the row 2163 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2164 if (wide) { 2165 try output.appendSlice(allocator, "<span class=\"w2\">"); 2166 try appendEscapedHtml(allocator, output, rune_text); 2167 try output.appendSlice(allocator, "</span>"); 2168 } else { 2169 try appendEscapedHtml(allocator, output, rune_text); 2170 } 2171 } else { 2172 try appendEscapedHtml(allocator, output, " "); 2173 } 2174 } 2175 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2176 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2177 try output.append(allocator, '\n'); 2178 } 2179 try output.appendSlice(allocator, "</div>"); 2180 2181 // native controls live in their panel, beside the replaceable cells. their 2182 // stable keys let JS update layout without recreating their DOM nodes, and 2183 // being actual descendants of a scroll gives them native movement/clipping. 2184 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2185 2186 // each child scroll becomes a natively-scrollable div positioned over its 2187 // viewport, holding its full content rendered recursively. 2188 for (direct.items) |id| { 2189 const child = focus.children.get(id) orelse continue; 2190 const info = child.focus.scroll orelse continue; 2191 const r = child.rect; 2192 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2193 // when that axis actually overflows. the other axis is clipped (hidden), 2194 // matching how the terminal Scroll handles its non-scrolling axis. 2195 const overflow = switch (info.direction) { 2196 .vert => "overflow-x:hidden;overflow-y:auto", 2197 .horiz => "overflow-x:auto;overflow-y:hidden", 2198 .both => "overflow:auto", 2199 }; 2200 // the id carries a content version so JS preserves the native scroll 2201 // position across re-renders of the same content but resets it when the 2202 // content is replaced — e.g. selecting a different commit. the widget's 2203 // scroll offset (in cells) rides along so JS can apply it when it has no 2204 // preserved position, letting a wasm-side scrollToRect (the files list 2205 // scrolling to its selected row on page load) reach the browser. 2206 var buf: [256]u8 = undefined; 2207 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, "<div class=\"scroll\" data-key=\"scroll:{d}\" data-scroll-id=\"{d}-{d}\" data-scroll-direction=\"{s}\" data-scroll-x=\"{d}\" data-scroll-y=\"{d}\" style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em;{s}\">", .{ id, id, child.focus.version, @tagName(info.direction), info.offset_x, info.offset_y, r.x, r.y, r.size.width, r.size.height, overflow })); 2208 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2209 try output.appendSlice(allocator, "</div>"); 2210 } 2211 } 2212 2213 const form_prefix = "form:"; 2214 const form_id_prefix = "haxy-form-"; 2215 2216 fn formAction(focus: *const Focus) ?[]const u8 { 2217 return switch (focus.kind) { 2218 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2219 else => null, 2220 }; 2221 } 2222 2223 // find the form ancestor of a flattened focus-tree child. html's `form` 2224 // attribute then associates the control with that form without requiring the 2225 // form and control to share a DOM parent. 2226 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2227 var id = focus_id; 2228 while (root_focus.children.get(id)) |child| { 2229 const parent_id = child.parent_id; 2230 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2231 const parent = root_focus.children.get(parent_id) orelse return null; 2232 if (formAction(parent.focus) != null) return parent_id; 2233 id = parent_id; 2234 } 2235 return null; 2236 } 2237 2238 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2239 const form_id = formOwner(root_focus, focus_id) orelse return; 2240 var buf: [64]u8 = undefined; 2241 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2242 } 2243 2244 fn renderPanelControls( 2245 allocator: std.mem.Allocator, 2246 output: *std.ArrayList(u8), 2247 focus: *Focus, 2248 session: *ui.Session, 2249 root_focus: *Focus, 2250 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2251 ) !void { 2252 var iter = focus.children.iterator(); 2253 while (iter.next()) |entry| { 2254 const id = entry.key_ptr.*; 2255 if (excluded.contains(id)) continue; 2256 const child = entry.value_ptr.*; 2257 const r = child.rect; 2258 2259 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2260 2261 switch (child.focus.kind) { 2262 .text_input, .text_input_password, .text_area => { 2263 const ti = session.text_inputs.get(id) orelse continue; 2264 2265 const inner_left = r.x + 1; 2266 const inner_top = r.y + 1; 2267 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2268 const preserve = !ti.options.read_only; 2269 2270 if (child.focus.kind == .text_area) { 2271 const value = try ti.text(allocator); 2272 defer allocator.free(value); 2273 var id_buf: [128]u8 = undefined; 2274 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2275 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2276 try appendFormAttribute(allocator, output, root_focus, id); 2277 if (ti.options.name.len > 0) { 2278 try output.appendSlice(allocator, " name=\""); 2279 try appendEscapedHtml(allocator, output, ti.options.name); 2280 try output.append(allocator, '"'); 2281 } 2282 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2283 var pos_buf: [128]u8 = undefined; 2284 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">\n", .{ inner_left, inner_top, inner_width, inner_height })); 2285 try appendEscapedHtml(allocator, output, value); 2286 try output.appendSlice(allocator, "</textarea>"); 2287 continue; 2288 } 2289 2290 var id_buf: [160]u8 = undefined; 2291 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"{s}\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ if (child.focus.kind == .text_input_password) "password" else "text", id, id })); 2292 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2293 try appendFormAttribute(allocator, output, root_focus, id); 2294 if (ti.options.name.len > 0) { 2295 try output.appendSlice(allocator, " name=\""); 2296 try appendEscapedHtml(allocator, output, ti.options.name); 2297 try output.append(allocator, '"'); 2298 } 2299 if (child.focus.kind != .text_input_password) { 2300 const value = try ti.text(allocator); 2301 defer allocator.free(value); 2302 try output.appendSlice(allocator, " value=\""); 2303 try appendEscapedHtml(allocator, output, value); 2304 try output.append(allocator, '"'); 2305 } 2306 var pos_buf: [96]u8 = undefined; 2307 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:1em\">", .{ inner_left, inner_top, inner_width })); 2308 }, 2309 .custom => |custom| { 2310 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2311 if (formOwner(root_focus, id) == null) continue; 2312 var id_buf: [128]u8 = undefined; 2313 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2314 try appendFormAttribute(allocator, output, root_focus, id); 2315 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2316 try output.appendSlice(allocator, " formaction=\""); 2317 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2318 try output.append(allocator, '"'); 2319 } 2320 var pos_buf: [128]u8 = undefined; 2321 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\"></button>", .{ r.x, r.y, r.size.width, r.size.height })); 2322 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2323 // an invisible native radio over the option, checked when the option is its row's selection 2324 const field = custom[ui.radio_prefix.len..]; 2325 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2326 const row = root_focus.children.get(child.parent_id) orelse continue; 2327 var id_buf: [128]u8 = undefined; 2328 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2329 try appendFormAttribute(allocator, output, root_focus, id); 2330 try output.appendSlice(allocator, " name=\""); 2331 try appendEscapedHtml(allocator, output, field[0..separator]); 2332 try output.appendSlice(allocator, "\" value=\""); 2333 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2334 try output.append(allocator, '"'); 2335 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2336 var pos_buf: [128]u8 = undefined; 2337 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"opacity:0;left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">", .{ r.x, r.y, r.size.width, r.size.height })); 2338 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2339 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2340 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2341 var id_buf: [128]u8 = undefined; 2342 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "\" data-key=\"control:{d}\" data-focus-id=\"{d}\" style=\"opacity:0;left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">", .{ id, id, r.x, r.y, r.size.width, r.size.height })); 2343 } 2344 }, 2345 else => {}, 2346 } 2347 } 2348 } 2349 2350 // emit hidden form owners beside the rendered panels. their controls point 2351 // back here with the standard HTML `form` attribute. 2352 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2353 // the focus child map preserves insertion order, which matches the order 2354 // widgets were added in code 2355 var iter = root_focus.children.iterator(); 2356 while (iter.next()) |entry| { 2357 const child = entry.value_ptr.*; 2358 const action_url = formAction(child.focus) orelse continue; 2359 2360 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2361 var id_buf: [96]u8 = undefined; 2362 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2363 try appendEscapedHtml(allocator, output, action_url); 2364 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2365 } 2366 } 2367 2368 // the 16 ansi colors as the browser shows them (xterm's defaults) 2369 const ansi_palette = [16]Grid.Color.Rgb{ 2370 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2371 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2372 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2373 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2374 }; 2375 2376 // resolve any color to rgb: palette colors through the ansi table and the 2377 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2378 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2379 return switch (color) { 2380 .rgb => |c| c, 2381 .ansi => |a| ansi_palette[@intFromEnum(a)], 2382 .indexed => |n| if (n < 16) 2383 ansi_palette[n] 2384 else if (n < 232) blk: { 2385 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2386 const i = n - 16; 2387 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2388 } else blk: { 2389 const v: u8 = 8 + (n - 232) * 10; 2390 break :blk .{ .r = v, .g = v, .b = v }; 2391 }, 2392 }; 2393 } 2394 2395 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2396 // cell's style into `buf`, omitting whichever color is unset. an inverted 2397 // cell swaps the two, falling back to the page's --fg/--bg variables for 2398 // whichever side is unset. text attributes follow the colors. returns an 2399 // empty slice when nothing is set. 2400 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2401 if (style.eql(.{})) return buf[0..0]; 2402 const prefix = " style=\""; 2403 @memcpy(buf[0..prefix.len], prefix); 2404 var i: usize = prefix.len; 2405 const inverted = style.inverted; 2406 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2407 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2408 const decoration: []const u8 = if (style.underline and style.strikethrough) 2409 "text-decoration:underline line-through;" 2410 else if (style.underline) 2411 "text-decoration:underline;" 2412 else if (style.strikethrough) 2413 "text-decoration:line-through;" 2414 else 2415 ""; 2416 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2417 if (style.bold) "font-weight:bold;" else "", 2418 if (style.italic) "font-style:italic;" else "", 2419 decoration, 2420 if (style.dim) "opacity:.6;" else "", 2421 }) catch return buf[0..0]; 2422 i += attributes.len; 2423 if (i >= buf.len) return buf[0..0]; 2424 buf[i] = '"'; 2425 return buf[0 .. i + 1]; 2426 } 2427 2428 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2429 // the color is unset (nothing when both are). returns the new end, or null 2430 // when it doesn't fit. 2431 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2432 const s = if (color) |c| blk: { 2433 const v = colorRgb(c); 2434 break :blk std.fmt.bufPrint(buf[i..], "{s}:#{x:0>2}{x:0>2}{x:0>2};", .{ prop, v.r, v.g, v.b }) catch return null; 2435 } else if (fallback) |f| 2436 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2437 else 2438 return i; 2439 return i + s.len; 2440 } 2441 2442 // a cell's link as an href, when it's a web or mail url 2443 fn webLink(link: ?[]const u8) ?[]const u8 { 2444 const url = link orelse return null; 2445 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2446 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2447 } 2448 return null; 2449 } 2450 2451 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2452 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2453 return b == null; 2454 } 2455 2456 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2457 for (input) |ch| { 2458 switch (ch) { 2459 '&' => try out.appendSlice(allocator, "&amp;"), 2460 '<' => try out.appendSlice(allocator, "&lt;"), 2461 '>' => try out.appendSlice(allocator, "&gt;"), 2462 '"' => try out.appendSlice(allocator, "&quot;"), 2463 '\'' => try out.appendSlice(allocator, "&#39;"), 2464 else => try out.append(allocator, ch), 2465 } 2466 } 2467 } 2468 2469 // --- helpers -------------------------------------------------------------- 2470 2471 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2472 var iter = request.iterateHeaders(); 2473 while (iter.next()) |header| { 2474 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2475 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2476 while (pairs.next()) |pair| { 2477 const trimmed = std.mem.trim(u8, pair, " \t"); 2478 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2479 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2480 return trimmed[eq + 1 ..]; 2481 } 2482 } 2483 } 2484 return null; 2485 } 2486 2487 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2488 var iter = std.mem.splitScalar(u8, body, '&'); 2489 while (iter.next()) |pair| { 2490 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2491 if (std.mem.eql(u8, pair[0..eq], key)) { 2492 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2493 } 2494 } 2495 return null; 2496 } 2497 2498 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2499 var buffer: [256]u8 = undefined; 2500 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2501 } 2502 2503 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2504 var out: std.ArrayList(u8) = .empty; 2505 errdefer out.deinit(allocator); 2506 var i: usize = 0; 2507 while (i < encoded.len) : (i += 1) { 2508 switch (encoded[i]) { 2509 '+' => try out.append(allocator, ' '), 2510 '%' => { 2511 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2512 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2513 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2514 try out.append(allocator, hi * 16 + lo); 2515 i += 2; 2516 }, 2517 else => try out.append(allocator, encoded[i]), 2518 } 2519 } 2520 return try out.toOwnedSlice(allocator); 2521 } 2522 2523 // disk-backed web session store. each login mints a random, opaque token 2524 // (not the user's id) that is stored as a file named by the token hex, whose 2525 // contents are the raw user_id bytes. authenticating a request is a lookup of 2526 // the cookie's token; logout deletes the file, revoking the session. there is 2527 // deliberately no expiry — a session lives until logout. form failures use 2528 // files in the flash subdirectory that the redirected GET consumes. the 2529 // directory is cleared whenever the server starts. 2530 pub const SessionStore = struct { 2531 io: std.Io, 2532 dir: std.Io.Dir, 2533 flash_dir: std.Io.Dir, 2534 auto_login: ?[token_hex_len]u8, 2535 2536 pub const token_hex_len = evt.event_id_size * 2; 2537 2538 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2539 try data_dir.createDirPath(io, "sessions"); 2540 const dir = try data_dir.openDir(io, "sessions", .{}); 2541 errdefer dir.close(io); 2542 try dir.deleteTree(io, "flash"); 2543 try dir.createDirPath(io, "flash"); 2544 const flash_dir = try dir.openDir(io, "flash", .{}); 2545 errdefer flash_dir.close(io); 2546 const auto_login = blk: { 2547 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2548 defer file.close(io); 2549 var token: [token_hex_len]u8 = undefined; 2550 var storage: [token_hex_len]u8 = undefined; 2551 var reader = file.reader(io, &storage); 2552 reader.interface.readSliceAll(&token) catch break :blk null; 2553 break :blk token; 2554 }; 2555 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2556 } 2557 2558 pub fn deinit(self: SessionStore) void { 2559 self.flash_dir.close(self.io); 2560 self.dir.close(self.io); 2561 } 2562 2563 // mint a new session for user_id, returning the token hex to set as the 2564 // cookie value. 2565 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2566 var token: [evt.event_id_size]u8 = undefined; 2567 self.io.random(&token); 2568 const token_hex = std.fmt.bytesToHex(token, .lower); 2569 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2570 defer file.close(self.io); 2571 try file.writeStreamingAll(self.io, user_id); 2572 return token_hex; 2573 } 2574 2575 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2576 var token: [evt.event_id_size]u8 = undefined; 2577 self.io.random(&token); 2578 const token_hex = std.fmt.bytesToHex(token, .lower); 2579 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2580 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2581 defer file.close(self.io); 2582 2583 var json: std.Io.Writer.Allocating = .init(allocator); 2584 defer json.deinit(); 2585 try std.json.Stringify.value(value, .{}, &json.writer); 2586 try file.writeStreamingAll(self.io, json.written()); 2587 return token_hex; 2588 } 2589 2590 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2591 if (!isToken(token_hex)) return null; 2592 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2593 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2594 defer file.close(self.io); 2595 2596 var storage: [4096]u8 = undefined; 2597 var reader = file.reader(self.io, &storage); 2598 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2599 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2600 } 2601 2602 // resolve a cookie's token to its user_id. returns false (logged out) for a 2603 // missing, malformed, or unknown token. 2604 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2605 if (!isToken(token_hex)) return false; 2606 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2607 defer file.close(self.io); 2608 var storage: [evt.event_id_size]u8 = undefined; 2609 var file_reader = file.reader(self.io, &storage); 2610 file_reader.interface.readSliceAll(out) catch return false; 2611 return true; 2612 } 2613 2614 // revoke a session. a no-op for a missing or malformed token. 2615 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2616 if (!isToken(token_hex)) return; 2617 self.dir.deleteFile(self.io, token_hex) catch {}; 2618 } 2619 2620 // leave `token_hex`'s session for visitors arriving without one. only the 2621 // `try` fixture writes one. the name can't collide with a session token. 2622 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2623 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2624 defer file.close(self.io); 2625 try file.writeStreamingAll(self.io, token_hex); 2626 } 2627 2628 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2629 out.* = self.auto_login orelse return false; 2630 return true; 2631 } 2632 2633 const auto_login_name = "auto-login"; 2634 2635 // a token is exactly token_hex_len hex chars. validating before using the 2636 // value as a path keeps attacker-supplied cookies from escaping the 2637 // sessions dir (e.g. via "/" or ".." bytes). 2638 fn isToken(token_hex: []const u8) bool { 2639 if (token_hex.len != token_hex_len) return false; 2640 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2641 return true; 2642 } 2643 }; 2644