╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭89200f97..╮ 89200f97.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (623) 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 │ ╰─────────────────────────────────╯
1122 try body.end(); 1123 } 1124 1125 // the images a browser renders safely inline. anything else downloads as 1126 // opaque bytes, so an uploaded page can't run on this origin. 1127 fn attachmentContentType(name: []const u8) ?[]const u8 { 1128 const types = [_]struct { ext: []const u8, value: []const u8 }{ 1129 .{ .ext = ".png", .value = "image/png" }, 1130 .{ .ext = ".jpg", .value = "image/jpeg" }, 1131 .{ .ext = ".jpeg", .value = "image/jpeg" }, 1132 .{ .ext = ".gif", .value = "image/gif" }, 1133 .{ .ext = ".webp", .value = "image/webp" }, 1134 }; 1135 for (types) |entry| { 1136 if (name.len > entry.ext.len and std.ascii.eqlIgnoreCase(name[name.len - entry.ext.len ..], entry.ext)) return entry.value; 1137 } 1138 return null; 1139 } 1140 1141 fn respondAttachmentNotFound(request: *std.http.Server.Request) !void { 1142 try request.respond("attachment not found", .{ 1143 .status = .not_found, 1144 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1145 }); 1146 } 1147 1148 fn respondAttachmentParentNotFound(request: *std.http.Server.Request) !void { 1149 try request.respond("attachment parent not found", .{ 1150 .status = .not_found, 1151 .keep_alive = false, 1152 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1153 }); 1154 } 1155 1156 // the upload declares its file's name here, since the body is the file itself 1157 const attachment_name_header = "x-attachment-name"; 1158 1159 const AttachParentParts = struct { 1160 repo_base: []const u8, 1161 kind: evt.EventKind, 1162 id_bytes: [evt.event_id_size]u8, 1163 }; 1164 1165 // what an attachment hangs off: the `<kind>:<id>` segment the form's page ends 1166 // with, whatever kind that is 1167 fn attachParentParts(base: []const u8) ?AttachParentParts { 1168 const segment_at = std.mem.lastIndexOfScalar(u8, base, '/') orelse return null; 1169 const segment = base[segment_at + 1 ..]; 1170 const colon_at = std.mem.lastIndexOfScalar(u8, segment, ':') orelse return null; 1171 const kind = std.meta.stringToEnum(evt.EventKind, segment[0..colon_at]) orelse return null; 1172 const id_bytes = evt.parseEventId(segment[colon_at + 1 ..]) catch return null; 1173 return .{ .repo_base = base[0..segment_at], .kind = kind, .id_bytes = id_bytes }; 1174 } 1175 1176 // attach the uploaded file to the event the url names, then reload. the file is 1177 // the whole request body, so it streams from the socket into the object store 1178 // without being buffered. 1179 fn handleAttach( 1180 io: std.Io, 1181 request: *std.http.Server.Request, 1182 allocator: std.mem.Allocator, 1183 base: []const u8, 1184 host: Host, 1185 ) !void { 1186 const parts = attachParentParts(base) orelse return respondAttachmentParentNotFound(request); 1187 1188 var author_arena = std.heap.ArenaAllocator.init(allocator); 1189 defer author_arena.deinit(); 1190 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1191 const author = actor.author; 1192 // an attachment changes the event it hangs off 1193 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondAttachmentParentNotFound(request); 1194 defer request_repo.deinit(allocator); 1195 const source = request_repo.source; 1196 if (!try source.canModify(io, allocator, actor, parts.kind, &parts.id_bytes)) return respondForbidden(request); 1197 1198 const name = (try attachmentName(allocator, request)) orelse return respondUploadError(request, .bad_request, "attachment needs a name"); 1199 defer allocator.free(name); 1200 if (!evt.Attachment.nameValid(name)) return respondUploadError(request, .bad_request, "invalid attachment name"); 1201 1202 const size = request.head.content_length orelse return respondUploadError(request, .length_required, "attachments must declare a content length"); 1203 if (size == 0) return respondUploadError(request, .bad_request, "attachment is empty"); 1204 if (size > evt.Attachment.max_size) return respondUploadError(request, .payload_too_large, "attachment is too large"); 1205 1206 const parent_id_hex = std.fmt.bytesToHex(parts.id_bytes, .lower); 1207 1208 var body_buf: [4096]u8 = undefined; 1209 const blob: evt.Blob = .{ .name = name, .size = size, .reader = try request.readerExpectContinue(&body_buf) }; 1210 1211 switch (source.repo_kind) { 1212 inline else => |repo_kind| { 1213 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1214 defer any_repo.deinit(io, allocator); 1215 switch (any_repo) { 1216 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) { 1217 error.ParentNotFound => return respondAttachmentParentNotFound(request), 1218 else => return err, 1219 }, 1220 } 1221 }, 1222 } 1223 1224 // the client reloads the page itself 1225 try request.respond("", .{ .status = .no_content, .keep_alive = false }); 1226 } 1227 1228 // the name the upload declares for its file, percent-encoded so it survives a 1229 // header 1230 fn attachmentName(allocator: std.mem.Allocator, request: *std.http.Server.Request) !?[]u8 { 1231 var iter = request.iterateHeaders(); 1232 while (iter.next()) |header| { 1233 if (!std.ascii.eqlIgnoreCase(header.name, attachment_name_header)) continue; 1234 return try decodeFormValue(allocator, header.value); 1235 } 1236 return null; 1237 } 1238 1239 // an upload that failed leaves the body partly read, so the connection closes 1240 fn respondUploadError(request: *std.http.Server.Request, status: std.http.Status, message: []const u8) !void { 1241 try request.respond(message, .{ 1242 .status = status, 1243 .keep_alive = false, 1244 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1245 }); 1246 } 1247 1248 // re-emit the comment `parts` names with a new body, in the repo the host 1249 // resolves the base to. 1250 fn updateComment( 1251 io: std.Io, 1252 allocator: std.mem.Allocator, 1253 host: Host, 1254 parts: CommentBaseParts, 1255 body: []const u8, 1256 author: evt.CommitAuthor, 1257 ) !void { 1258 const comment_id = parts.comment_id orelse return error.NotFound; 1259 const thread_id = std.fmt.bytesToHex(parts.thread_id, .lower); 1260 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return error.NotFound; 1261 defer request_repo.deinit(allocator); 1262 const source = request_repo.source; 1263 switch (source.repo_kind) { 1264 inline else => |repo_kind| { 1265 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1266 defer any_repo.deinit(io, allocator); 1267 switch (any_repo) { 1268 inline else => |*repo| try evt.Comment.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, &thread_id, &comment_id, body, author), 1269 } 1270 }, 1271 } 1272 } 1273 1274 // edit actions share a suffix; the base identifies the event being edited. 1275 fn handleEdit( 1276 io: std.Io, 1277 request: *std.http.Server.Request, 1278 allocator: std.mem.Allocator, 1279 base: []const u8, 1280 host: Host, 1281 ) !void { 1282 const parts = commentBaseParts(base) orelse return respondRemoveNotFound(request); 1283 if (parts.comment_id != null) return handleCommentEdit(io, request, allocator, base, host, parts); 1284 return handleThreadEdit(io, request, allocator, base, host, parts); 1285 } 1286 1287 // replace the body of the comment the url names, then redirect to its 1288 // permalink. 1289 fn handleCommentEdit( 1290 io: std.Io, 1291 request: *std.http.Server.Request, 1292 allocator: std.mem.Allocator, 1293 base: []const u8, 1294 host: Host, 1295 parts: CommentBaseParts, 1296 ) !void { 1297 var author_arena = std.heap.ArenaAllocator.init(allocator); 1298 defer author_arena.deinit(); 1299 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1300 const author = actor.author; 1301 // edits only reach here for a comment 1302 const comment_id = parts.comment_id orelse unreachable; 1303 { 1304 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1305 defer request_repo.deinit(allocator); 1306 if (!try request_repo.source.canModify(io, allocator, actor, .comment, &comment_id)) return respondForbidden(request); 1307 } 1308 1309 const form_body = try readFormBody(request, allocator); 1310 defer allocator.free(form_body); 1311 const body_crlf = (try parseFormField(allocator, form_body, "body")) orelse try allocator.dupe(u8, ""); 1312 defer allocator.free(body_crlf); 1313 const body = try std.mem.replaceOwned(u8, allocator, body_crlf, "\r\n", "\n"); 1314 defer allocator.free(body); 1315 1316 if (!evt.Comment.fieldsValid(body)) { 1317 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1318 defer allocator.free(form_location); 1319 try request.respond("", .{ 1320 .status = .see_other, 1321 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1322 }); 1323 return; 1324 } 1325 1326 const not_found = "comment not found"; 1327 updateComment(io, allocator, host, parts, body, author) catch |err| switch (err) { 1328 error.NotFound => { 1329 try request.respond(not_found, .{ 1330 .status = .not_found, 1331 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1332 }); 1333 return; 1334 }, 1335 else => |e| return e, 1336 }; 1337 1338 try request.respond("", .{ 1339 .status = .see_other, 1340 .extra_headers = &.{.{ .name = "location", .value = base }}, 1341 }); 1342 } 1343 1344 fn updateThread( 1345 comptime Event: type, 1346 io: std.Io, 1347 allocator: std.mem.Allocator, 1348 host: Host, 1349 repo_base: []const u8, 1350 id: *const [evt.event_id_size]u8, 1351 update: Event.Update, 1352 author: evt.CommitAuthor, 1353 ) !void { 1354 const request_repo = (try requestRepoSource(io, allocator, host, repo_base)) orelse return error.NotFound; 1355 defer request_repo.deinit(allocator); 1356 const source = request_repo.source; 1357 switch (source.repo_kind) { 1358 inline else => |repo_kind| { 1359 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1360 defer any_repo.deinit(io, allocator); 1361 switch (any_repo) { 1362 inline else => |*repo| try Event.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, id, update, author), 1363 } 1364 }, 1365 } 1366 } 1367 1368 const RemoveParts = struct { 1369 repo_base: []const u8, 1370 kind: evt.EventKind, 1371 id: [evt.event_id_size]u8, 1372 }; 1373 1374 // split a remove url into the repo and event it names 1375 fn removeParts(base: []const u8) ?RemoveParts { 1376 if (attachmentRequest(base)) |attachment| { 1377 const parent = attachParentParts(attachment.repo_base) orelse return null; 1378 return .{ 1379 .repo_base = parent.repo_base, 1380 .kind = .attach, 1381 .id = attachment.id, 1382 }; 1383 } 1384 if (commentBaseParts(base)) |thread| return .{ 1385 .repo_base = thread.repo_base, 1386 .kind = if (thread.comment_id != null) .comment else thread.thread_kind, 1387 .id = thread.comment_id orelse thread.thread_id, 1388 }; 1389 return null; 1390 } 1391 1392 // remove the event named by the form's url 1393 fn handleRemove( 1394 io: std.Io, 1395 request: *std.http.Server.Request, 1396 allocator: std.mem.Allocator, 1397 base: []const u8, 1398 host: Host, 1399 ) !void { 1400 const parts = removeParts(base) orelse return respondRemoveNotFound(request); 1401 1402 var author_arena = std.heap.ArenaAllocator.init(allocator); 1403 defer author_arena.deinit(); 1404 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1405 const author = actor.author; 1406 1407 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1408 defer request_repo.deinit(allocator); 1409 const source = request_repo.source; 1410 1411 if (parts.kind == .patch) switch (host) { 1412 .server => |server| { 1413 const user_id = actor.user_id orelse return respondLoginRequired(request); 1414 1415 // a draft lives in its author's user repo 1416 if (try evt.readForkById(io, allocator, &author_arena, server.users_dir, &user_id, &parts.id)) |fork_record| { 1417 const repo_id = evt.parseEventId(std.fs.path.basename(source.path)) catch return respondRemoveNotFound(request); 1418 if (!fork_record.removed and fork_record.event.stage == .draft and std.mem.eql(u8, fork_record.event.repo_id, &repo_id)) { 1419 const id = std.fmt.bytesToHex(parts.id, .lower); 1420 try fork.remove(io, allocator, server.users_dir, &user_id, &id, author); 1421 1422 const location = try std.fmt.allocPrint(allocator, "{s}/patches/drafts", .{parts.repo_base}); 1423 defer allocator.free(location); 1424 try request.respond("", .{ 1425 .status = .see_other, 1426 .keep_alive = false, 1427 .extra_headers = &.{.{ .name = "location", .value = location }}, 1428 }); 1429 return; 1430 } 1431 } 1432 }, 1433 .local => {}, 1434 }; 1435 1436 // a draft is its author's alone, which its removal above checks 1437 if (!try source.canModify(io, allocator, actor, parts.kind, &parts.id)) return respondForbidden(request); 1438 1439 switch (source.repo_kind) { 1440 inline else => |repo_kind| { 1441 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1442 defer any_repo.deinit(io, allocator); 1443 switch (any_repo) { 1444 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) { 1445 error.EventNotFound => return respondRemoveNotFound(request), 1446 else => |e| return e, 1447 }, 1448 } 1449 }, 1450 } 1451 1452 const id = std.fmt.bytesToHex(parts.id, .lower); 1453 const location = try std.fmt.allocPrint(allocator, "{s}/event:{s}/kind:{s}", .{ parts.repo_base, &id, @tagName(parts.kind) }); 1454 defer allocator.free(location); 1455 try request.respond("", .{ 1456 .status = .see_other, 1457 .keep_alive = false, 1458 .extra_headers = &.{.{ .name = "location", .value = location }}, 1459 }); 1460 } 1461 1462 fn respondRemoveNotFound(request: *std.http.Server.Request) !void { 1463 try request.respond("event not found", .{ 1464 .status = .not_found, 1465 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1466 }); 1467 } 1468 1469 fn updateDiscussion( 1470 io: std.Io, 1471 allocator: std.mem.Allocator, 1472 host: Host, 1473 repo_base: []const u8, 1474 id: *const [evt.event_id_size]u8, 1475 title: []const u8, 1476 labels: []const u8, 1477 description: []const u8, 1478 author: evt.CommitAuthor, 1479 ) !void { 1480 const request_repo = (try requestRepoSource(io, allocator, host, repo_base)) orelse return error.NotFound; 1481 defer request_repo.deinit(allocator); 1482 const source = request_repo.source; 1483 switch (source.repo_kind) { 1484 inline else => |repo_kind| { 1485 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1486 defer any_repo.deinit(io, allocator); 1487 switch (any_repo) { 1488 inline else => |*repo| try evt.Discussion.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, id, title, labels, description, author), 1489 } 1490 }, 1491 } 1492 } 1493 1494 // set the status of the issue the url names (base is 1495 // "/repo/<owner>/<name>/issue:<id>", identity elided in local mode) by 1496 // re-emitting its event, then redirect back to it 1497 fn handleThreadStatus( 1498 io: std.Io, 1499 request: *std.http.Server.Request, 1500 allocator: std.mem.Allocator, 1501 base: []const u8, 1502 host: Host, 1503 open: bool, 1504 ) !void { 1505 const not_found = "thread not found"; 1506 const parts = commentBaseParts(base) orelse { 1507 try request.respond(not_found, .{ 1508 .status = .not_found, 1509 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1510 }); 1511 return; 1512 }; 1513 1514 var author_arena = std.heap.ArenaAllocator.init(allocator); 1515 defer author_arena.deinit(); 1516 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1517 const author = actor.author; 1518 { 1519 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1520 defer request_repo.deinit(allocator); 1521 if (!try request_repo.source.canModify(io, allocator, actor, parts.thread_kind, &parts.thread_id)) return respondForbidden(request); 1522 } 1523 1524 (switch (parts.thread_kind) { 1525 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .status = if (open) .open else .closed }, author), 1526 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .status = if (open) .open else .closed }, author), 1527 else => return respondRemoveNotFound(request), 1528 }) catch |err| switch (err) { 1529 error.NotFound => { 1530 try request.respond(not_found, .{ 1531 .status = .not_found, 1532 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1533 }); 1534 return; 1535 }, 1536 else => |e| return e, 1537 }; 1538 1539 // like logout, this is a bodyless POST, so close the connection rather than 1540 // letting the keep-alive path try to discard a body that isn't framed. 1541 try request.respond("", .{ 1542 .status = .see_other, 1543 .keep_alive = false, 1544 .extra_headers = &.{.{ .name = "location", .value = base }}, 1545 }); 1546 } 1547 1548 // replace a thread's editable fields. 1549 fn handleThreadEdit( 1550 io: std.Io, 1551 request: *std.http.Server.Request, 1552 allocator: std.mem.Allocator, 1553 base: []const u8, 1554 host: Host, 1555 parts: CommentBaseParts, 1556 ) !void { 1557 var author_arena = std.heap.ArenaAllocator.init(allocator); 1558 defer author_arena.deinit(); 1559 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read)) orelse return; 1560 const author = actor.author; 1561 1562 const body = try readFormBody(request, allocator); 1563 defer allocator.free(body); 1564 1565 const title = (try parseFormField(allocator, body, "title")) orelse try allocator.dupe(u8, ""); 1566 defer allocator.free(title); 1567 const labels = (try parseFormField(allocator, body, "labels")) orelse try allocator.dupe(u8, ""); 1568 defer allocator.free(labels); 1569 const description_crlf = (try parseFormField(allocator, body, "description")) orelse try allocator.dupe(u8, ""); 1570 defer allocator.free(description_crlf); 1571 // form submission normalizes textarea line breaks to CRLF; store plain 1572 // newlines so the text renders the same on every host 1573 const description = try std.mem.replaceOwned(u8, allocator, description_crlf, "\r\n", "\n"); 1574 defer allocator.free(description); 1575 const target_branch = (try parseFormField(allocator, body, "target_branch")) orelse try allocator.dupe(u8, ""); 1576 defer allocator.free(target_branch); 1577 1578 // invalid fields send the user back to the edit form 1579 const valid = switch (parts.thread_kind) { 1580 .issue => evt.Issue.fieldsValid(title, labels), 1581 .patch => evt.Patch.fieldsValid(title, labels), 1582 .discuss => evt.Discussion.fieldsValid(title, labels), 1583 else => unreachable, 1584 }; 1585 if (!valid) { 1586 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1587 defer allocator.free(form_location); 1588 if (!evt.titleValid(title)) { 1589 return respondThreadFormFailure(request, allocator, host, form_location, requiredTitleFeedback(parts.thread_kind, title, labels, description, target_branch, null)); 1590 } 1591 try request.respond("", .{ 1592 .status = .see_other, 1593 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1594 }); 1595 return; 1596 } 1597 1598 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1599 defer request_repo.deinit(allocator); 1600 1601 const draft_user_id = if (parts.thread_kind == .patch) actor.user_id else null; 1602 if (draft_user_id) |user_id| { 1603 const server = switch (host) { 1604 .server => |server| server, 1605 .local => unreachable, 1606 }; 1607 if (!evt.Patch.branchValid(target_branch) or !try request_repo.source.hasBranch(io, allocator, target_branch)) { 1608 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1609 defer allocator.free(form_location); 1610 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(.invalid_target_branch, title, labels, description, target_branch, null)); 1611 } 1612 const repo_id = evt.parseEventId(std.fs.path.basename(request_repo.source.path)) catch return respondRemoveNotFound(request); 1613 var admin_repo = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1614 defer admin_repo.deinit(io, allocator); 1615 const id = std.fmt.bytesToHex(parts.thread_id, .lower); 1616 if (try pch.editDraft(.{}, io, allocator, server.users_dir, &admin_repo, .{ 1617 .id = id, 1618 .user_id = user_id, 1619 .repo_id = repo_id, 1620 .title = title, 1621 .labels = labels, 1622 .description = description, 1623 .target_branch = target_branch, 1624 .author = author, 1625 .timestamp = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()), 1626 })) { 1627 try request.respond("", .{ 1628 .status = .see_other, 1629 .extra_headers = &.{.{ .name = "location", .value = base }}, 1630 }); 1631 return; 1632 } 1633 } 1634 1635 // a draft is its author's alone, which its edit above checks 1636 if (!try request_repo.source.canModify(io, allocator, actor, parts.thread_kind, &parts.thread_id)) return respondForbidden(request); 1637 1638 const not_found = switch (parts.thread_kind) { 1639 .issue => "issue not found", 1640 .patch => "patch not found", 1641 .discuss => "discussion not found", 1642 else => unreachable, 1643 }; 1644 (switch (parts.thread_kind) { 1645 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .fields = .{ 1646 .title = title, 1647 .labels = labels, 1648 .description = description, 1649 } }, author), 1650 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .fields = .{ 1651 .title = title, 1652 .labels = labels, 1653 .description = description, 1654 .target_branch = target_branch, 1655 } }, author), 1656 .discuss => updateDiscussion(io, allocator, host, parts.repo_base, &parts.thread_id, title, labels, description, author), 1657 else => unreachable, 1658 }) catch |err| switch (err) { 1659 error.NotFound => { 1660 try request.respond(not_found, .{ 1661 .status = .not_found, 1662 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1663 }); 1664 return; 1665 }, 1666 else => { 1667 if (parts.thread_kind != .patch) return err; 1668 const failure = ui.Session.FormFeedback.PatchFailure.fromError(err) orelse return err; 1669 const form_location = try std.fmt.allocPrint(allocator, "{s}/edit", .{base}); 1670 defer allocator.free(form_location); 1671 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(failure, title, labels, description, target_branch, null)); 1672 }, 1673 }; 1674 1675 try request.respond("", .{ 1676 .status = .see_other, 1677 .extra_headers = &.{.{ .name = "location", .value = base }}, 1678 }); 1679 } 1680 1681 // resolve every conflicted field of the thread the url names 1682 fn handleThreadResolve( 1683 io: std.Io, 1684 request: *std.http.Server.Request, 1685 allocator: std.mem.Allocator, 1686 base: []const u8, 1687 host: Host, 1688 ) !void { 1689 const parts = commentBaseParts(base) orelse { 1690 try request.respond("thread not found", .{ 1691 .status = .not_found, 1692 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1693 }); 1694 return; 1695 }; 1696 1697 var author_arena = std.heap.ArenaAllocator.init(allocator); 1698 defer author_arena.deinit(); 1699 const author = ((try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .write)) orelse return).author; 1700 1701 const body = try readFormBody(request, allocator); 1702 defer allocator.free(body); 1703 1704 var field_arena = std.heap.ArenaAllocator.init(allocator); 1705 defer field_arena.deinit(); 1706 const aa = field_arena.allocator(); 1707 const title = try parseFormField(aa, body, "title"); 1708 const labels = try parseFormField(aa, body, "labels"); 1709 1710 // the hunk inputs are submitted as d0, d1, ...; form submission normalizes their 1711 // textarea line breaks to CRLF 1712 var hunks: std.ArrayList([]const u8) = .empty; 1713 var hunk_index: usize = 0; 1714 while (true) : (hunk_index += 1) { 1715 const name = try std.fmt.allocPrint(aa, "d{d}", .{hunk_index}); 1716 const submitted = (try parseFormField(aa, body, name)) orelse break; 1717 try hunks.append(aa, try std.mem.replaceOwned(u8, aa, submitted, "\r\n", "\n")); 1718 } 1719 1720 if (parts.comment_id != null or (parts.thread_kind != .issue and parts.thread_kind != .patch)) { 1721 try request.respond("thread not found", .{ 1722 .status = .not_found, 1723 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1724 }); 1725 return; 1726 } 1727 const route = ui.RoutablePage.fromUrl(base) orelse ui.RoutablePage.fromUrlLocal(base) orelse { 1728 try request.respond("thread not found", .{ 1729 .status = .not_found, 1730 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1731 }); 1732 return; 1733 }; 1734 const theirs: []const u8 = switch (route) { 1735 .repo_patches => |*patch| patch.theirs.slice(), 1736 .repo_issues => "", 1737 else => unreachable, 1738 }; 1739 const not_found = if (parts.thread_kind == .patch) "patch not found" else "issue not found"; 1740 1741 (switch (parts.thread_kind) { 1742 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1743 .title = title, 1744 .labels = labels, 1745 .hunks = hunks.items, 1746 } }, author), 1747 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1748 .title = title, 1749 .labels = labels, 1750 .hunks = hunks.items, 1751 .theirs = theirs, 1752 } }, author), 1753 else => unreachable, 1754 }) catch |err| switch (err) { 1755 error.NotFound => { 1756 try request.respond(not_found, .{ 1757 .status = .not_found, 1758 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1759 }); 1760 return; 1761 }, 1762 // invalid fields send the user back to the resolve form 1763 error.InvalidFields => { 1764 const form_location = try std.fmt.allocPrint(allocator, "{s}/resolve", .{base}); 1765 defer allocator.free(form_location); 1766 try request.respond("", .{ 1767 .status = .see_other, 1768 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1769 }); 1770 return; 1771 }, 1772 else => |e| return e, 1773 }; 1774 1775 try request.respond("", .{ 1776 .status = .see_other, 1777 .extra_headers = &.{.{ .name = "location", .value = base }}, 1778 }); 1779 } 1780 1781 // the posted path drops the action's own segment, so the route it parses is 1782 // the undo page the action applies to, never the confirmation page itself 1783 fn handleUndo(io: std.Io, request: *std.http.Server.Request, allocator: std.mem.Allocator, base: []const u8, host: Host, action: enum { undo, clear }) !void { 1784 const route = (switch (host) { 1785 .local => ui.RoutablePage.fromUrlLocal(base), 1786 .server => ui.RoutablePage.fromUrl(base), 1787 }) orelse return respondRepoNotFound(request); 1788 if (route != .repo_undo) return respondRepoNotFound(request); 1789 const target = route.repo_undo; 1790 var arena = std.heap.ArenaAllocator.init(allocator); 1791 defer arena.deinit(); 1792 const repo_base = if (target.name.len == 0) "" else try std.fmt.allocPrint(arena.allocator(), "/repo/{s}", .{target.name.slice()}); 1793 _ = (try authorizeWrite(io, allocator, &arena, request, host, repo_base, .owner)) orelse return; 1794 const resolved = (try requestRepoSource(io, allocator, host, repo_base)) orelse return respondRepoNotFound(request); 1795 defer resolved.deinit(allocator); 1796 (switch (action) { 1797 .undo => ui.Repo.Undo.execute(io, allocator, resolved.source, target.index orelse return respondRepoNotFound(request)), 1798 .clear => ui.Repo.Undo.clearHistory(io, allocator, resolved.source), 1799 }) catch |err| switch (err) { 1800 error.NotFound, error.InvalidHistoryIndex, error.TransactionNotFound => return respondRepoNotFound(request), 1801 else => return err, 1802 }; 1803 const location = try (ui.RoutablePage.repoUndoRoute(target.name.slice(), null) orelse return error.RouteTooLong).toUrl(&arena); 1804 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = location }} }); 1805 } 1806 1807 fn handleSync( 1808 io: std.Io, 1809 request: *std.http.Server.Request, 1810 allocator: std.mem.Allocator, 1811 base: []const u8, 1812 source: ui.RepoSource, 1813 ) !void { 1814 if (base.len != 0) { 1815 try request.respond("not found", .{ 1816 .status = .not_found, 1817 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1818 }); 1819 return; 1820 } 1821 1822 var owned_failure: ?[]u8 = null; 1823 defer if (owned_failure) |message| allocator.free(message); 1824 const failure: ?[]const u8 = blk: { 1825 owned_failure = ui.Repo.Events.sync(io, allocator, source) catch |err| break :blk @errorName(err); 1826 break :blk owned_failure; 1827 }; 1828 if (failure) |message| { 1829 var encoded: std.Io.Writer.Allocating = .init(allocator); 1830 defer encoded.deinit(); 1831 try std.Uri.Component.percentEncode(&encoded.writer, message, struct { 1832 fn isUnreserved(c: u8) bool { 1833 return std.ascii.isAlphanumeric(c) or c == '-' or c == '.' or c == '_' or c == '~'; 1834 } 1835 }.isUnreserved); 1836 const cookie = try std.fmt.allocPrint( 1837 allocator, 1838 local_flash_cookie ++ "=" ++ local_sync_failure_prefix ++ "{s}; Path=/; HttpOnly; SameSite=Strict", 1839 .{encoded.written()}, 1840 ); 1841 defer allocator.free(cookie); 1842 try request.respond("", .{ 1843 .status = .see_other, 1844 .extra_headers = &.{ 1845 .{ .name = "location", .value = "/events" }, 1846 .{ .name = "set-cookie", .value = cookie }, 1847 }, 1848 }); 1849 return; 1850 } 1851 1852 try request.respond("", .{ 1853 .status = .see_other, 1854 .extra_headers = &.{ 1855 .{ .name = "location", .value = "/events" }, 1856 .{ .name = "set-cookie", .value = local_flash_cookie ++ "=; Path=/; Max-Age=0" }, 1857 }, 1858 }); 1859 } 1860 1861 fn renderIndexHtml( 1862 io: std.Io, 1863 allocator: std.mem.Allocator, 1864 host: Host, 1865 session_token: ?[]const u8, 1866 session_data: ui.Session.Data, 1867 ) ![]const u8 { 1868 const template = (findEmbed("/index.html") orelse return error.MissingIndexAsset).body; 1869 1870 var page_arena = std.heap.ArenaAllocator.init(allocator); 1871 defer page_arena.deinit(); 1872 1873 // the server admin repo must outlive the page build, since the session's 1874 // moment reads from it. 1875 var repo_maybe: ?rp.Repo(.xit, evt.admin_repo_opts) = null; 1876 defer if (repo_maybe) |*repo| repo.deinit(io, allocator); 1877 1878 var session = switch (host) { 1879 .server => |server| blk: { 1880 // open the admin repo to read live user/repo data. 1881 repo_maybe = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1882 const repo = if (repo_maybe) |*repo| repo else unreachable; 1883 var session = try ui.Session.init(&page_arena, repo, session_data); 1884 // the session dropped a user whose account was removed, so revoke 1885 // the token that named them 1886 if (session_token) |token| { 1887 if (session.data.user_id == null) server.session_store.remove(token); 1888 } 1889 // give the page builders filesystem access to the on-disk repos (a 1890 // sibling "users" dir next to the admin repo) so the Repo page can 1891 // read its files. 1892 session.users_dir = server.users_dir; 1893 break :blk session; 1894 }, 1895 .local => |local| ui.Session{ 1896 .data = session_data, 1897 .arena = &page_arena, 1898 .page_arena = &page_arena, 1899 .local = local, 1900 }, 1901 }; 1902 session.io = io; 1903 1904 var page = try ui.Page.init(session.page_arena, &session, session.data.current_page); 1905 var root = try ui.initRoot(allocator, &page, &session); 1906 defer root.deinit(allocator); 1907 1908 const snapshot: ui.Snapshot = .{ .page = page, .session = session.data }; 1909 1910 const content = try generateHtml(allocator, &root, &session); 1911 defer allocator.free(content); 1912 1913 // serialize the snapshot so the wasm side can parse it back without making 1914 // a second request. it's embedded raw in a <script type="application/json"> 1915 // block, whose content is raw text terminated only by "</script". in json, 1916 // '<' appears solely inside string values, so escaping every '<' (and '>' 1917 // for good measure) to its \uXXXX form yields equivalent json that can't 1918 // break out of the tag. 1919 var json: std.Io.Writer.Allocating = .init(allocator); 1920 defer json.deinit(); 1921 try std.json.Stringify.value(snapshot, .{}, &json.writer); 1922 1923 var json_escaped: std.ArrayList(u8) = .empty; 1924 defer json_escaped.deinit(allocator); 1925 for (json.written()) |c| switch (c) { 1926 '<' => try json_escaped.appendSlice(allocator, "\\u003c"), 1927 '>' => try json_escaped.appendSlice(allocator, "\\u003e"), 1928 else => try json_escaped.append(allocator, c), 1929 }; 1930 1931 var out: std.ArrayList(u8) = .empty; 1932 errdefer out.deinit(allocator); 1933 { 1934 var cursor: usize = 0; 1935 for (&[_]struct { needle: []const u8, replacement: []const u8 }{ 1936 .{ .needle = "{{{ HAXY_HTML }}}", .replacement = content }, 1937 .{ .needle = "{{{ HAXY_JSON }}}", .replacement = json_escaped.items }, 1938 }) |sub| { 1939 const idx = std.mem.indexOfPos(u8, template, cursor, sub.needle) orelse return error.MissingTemplateToken; 1940 try out.appendSlice(allocator, template[cursor..idx]); 1941 try out.appendSlice(allocator, sub.replacement); 1942 cursor = idx + sub.needle.len; 1943 } 1944 try out.appendSlice(allocator, template[cursor..]); 1945 } 1946 return try out.toOwnedSlice(allocator); 1947 } 1948 1949 fn findEmbed(request_path: []const u8) ?Embed { 1950 const path = if (std.mem.eql(u8, request_path, "/")) 1951 "index.html" 1952 else if (request_path.len > 1 and request_path[0] == '/') 1953 request_path[1..] 1954 else 1955 return null; 1956 1957 for (embeds) |embed| { 1958 if (std.mem.eql(u8, path, embed.path)) return embed; 1959 } 1960 return null; 1961 } 1962 1963 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 1964 // own absolutely-positioned, natively-scrollable <div> holding its full content, 1965 // rendered recursively so nested scrolls work. 1966 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 1967 const grid = root.getGrid() orelse return error.MissingGrid; 1968 const root_focus = root.getFocus(); 1969 1970 var out: std.ArrayList(u8) = .empty; 1971 errdefer out.deinit(allocator); 1972 1973 switch (root.*) { 1974 .background => |*background| { 1975 if (background.art.getGrid()) |art| { 1976 try out.print(allocator, "<div class=\"ansi-art\" aria-hidden=\"true\" style=\"left:{d}ch;opacity:{d}%\">", .{ grid.size.width -| art.size.width, ui.widget.AnsiBackground.art_opacity }); 1977 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 1978 try out.appendSlice(allocator, "</div>"); 1979 } 1980 }, 1981 else => {}, 1982 } 1983 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 1984 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 1985 try out.appendSlice(allocator, "</div>"); 1986 try renderForms(allocator, &out, root_focus); 1987 return try out.toOwnedSlice(allocator); 1988 } 1989 1990 // render one panel — a focus subtree and its content grid — as HTML, recursing 1991 // once per web-native Scroll inside it. the root panel is the whole page; each 1992 // Scroll becomes a nested, natively-scrollable div holding its full content. 1993 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 1994 // then the child scroll divs over those holes. 1995 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 1996 // `direct` is this panel's scroll children, each drawn as an overlaid div. 1997 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 1998 // plus their descendants, which the focus tree flattens into this panel's 1999 // children): the cell hit-test below skips them so this panel doesn't claim 2000 // cells that are really rendered inside a child scroll's own panel. 2001 // (scrolls aren't nested in practice, so every scroll child is direct here.) 2002 var direct: std.ArrayList(usize) = .empty; 2003 defer direct.deinit(allocator); 2004 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 2005 defer excluded.deinit(allocator); 2006 { 2007 var it = focus.children.iterator(); 2008 while (it.next()) |e| { 2009 if (e.value_ptr.focus.scroll == null) continue; 2010 try direct.append(allocator, e.key_ptr.*); 2011 try excluded.put(allocator, e.key_ptr.*, {}); 2012 var mit = e.value_ptr.focus.children.iterator(); 2013 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 2014 } 2015 } 2016 2017 // the HTML element a run of cells is wrapped in, chosen from the cell's 2018 // focusable kind 2019 const CellTag = union(enum) { 2020 span, // clickable focusable cell 2021 a: []const u8, // clickable focusable link 2022 plain, // non-focusable, colored 2023 2024 const a_prefix = "a:"; 2025 // an "in-page" anchor: rendered as a real <a href> so it works with js 2026 // disabled, but wasm handles it without navigating. 2027 fn init(str: []const u8) @This() { 2028 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2029 return .{ .a = str[ui.raw_link_prefix.len..] }; 2030 } 2031 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2032 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2033 } 2034 if (std.mem.startsWith(u8, str, a_prefix)) { 2035 return .{ .a = str[a_prefix.len..] }; 2036 } 2037 return .span; 2038 } 2039 2040 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2041 var id_buf: [32]u8 = undefined; 2042 switch (self) { 2043 .span => { 2044 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2045 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2046 try out.appendSlice(alloc, "\""); 2047 try out.appendSlice(alloc, style_attr); 2048 try out.appendSlice(alloc, ">"); 2049 }, 2050 .a => |href| { 2051 // tabindex=-1 keeps these out of the browser's tab order 2052 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2053 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2054 try out.appendSlice(alloc, "\" href=\""); 2055 try appendEscapedHtml(alloc, out, href); 2056 try out.appendSlice(alloc, "\""); 2057 try out.appendSlice(alloc, style_attr); 2058 try out.appendSlice(alloc, ">"); 2059 }, 2060 .plain => { 2061 try out.appendSlice(alloc, "<span"); 2062 try out.appendSlice(alloc, style_attr); 2063 try out.appendSlice(alloc, ">"); 2064 }, 2065 } 2066 } 2067 2068 fn closeTag(self: @This()) []const u8 { 2069 return switch (self) { 2070 .span, .plain => "</span>", 2071 .a => "</a>", 2072 }; 2073 } 2074 }; 2075 2076 // the focusable owning each cell, among this panel's own (skipping any 2077 // that belong to a child scroll, whose cells are drawn in their own panel). 2078 // claimed in focus order, so the first focusable over a cell keeps it. 2079 // looking every focusable up for every cell is quadratic in a long list. 2080 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2081 defer allocator.free(owners); 2082 @memset(owners, null); 2083 { 2084 var it = focus.children.iterator(); 2085 while (it.next()) |entry| { 2086 const child = entry.value_ptr.*; 2087 if (child.focus.mode != .all) continue; 2088 if (excluded.contains(entry.key_ptr.*)) continue; 2089 const r = child.rect; 2090 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2091 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2092 const owner = &owners[y * grid.size.width + x]; 2093 if (owner.* == null) owner.* = entry.key_ptr.*; 2094 } 2095 } 2096 } 2097 } 2098 2099 // the cells are the volatile part of a panel. js replaces this one subtree 2100 // wholesale while retaining the panel's native controls and scroll shells. 2101 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2102 2103 // emit this panel's grid as rows of text, coalescing adjacent cells that 2104 // share a focus id and style into one tag (a clickable span, a link, or a 2105 // plain styled span). cells under a child scroll keep only their background. 2106 // a cell's own link is an anchor nested in that tag. 2107 for (0..grid.size.height) |y| { 2108 var cur_id: ?usize = null; 2109 var cur_style: Grid.Style = .{}; 2110 var open_tag: ?CellTag = null; 2111 var open_link: ?[]const u8 = null; 2112 var first = true; 2113 for (0..grid.size.width) |x| { 2114 const cell = (try grid.cell(x, y)).*; 2115 // a cell covered by a child scroll's viewport is drawn by that scroll's 2116 // own div, so blank its glyph and make it non-clickable here — but keep 2117 // its background, so the backdrop still shows through the scroll's 2118 // transparent div instead of a bare hole. 2119 const covered_by_scroll = blk: { 2120 for (direct.items) |id| { 2121 const r = (focus.children.get(id) orelse continue).rect; 2122 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; 2123 } 2124 break :blk false; 2125 }; 2126 // the focusable owning the cell at (x, y); none for a covered cell. 2127 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2128 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2129 2130 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2131 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2132 open_link = null; 2133 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2134 2135 var new_tag: ?CellTag = null; 2136 if (cell_id) |id| { 2137 if (focus.children.get(id)) |child| { 2138 new_tag = switch (child.focus.kind) { 2139 .custom => |custom| CellTag.init(custom), 2140 else => .span, 2141 }; 2142 } 2143 } 2144 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2145 2146 if (new_tag) |t| { 2147 var style_buf: [192]u8 = undefined; 2148 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2149 } 2150 2151 open_tag = new_tag; 2152 cur_id = cell_id; 2153 cur_style = style; 2154 first = false; 2155 } 2156 2157 // an anchor can't nest in another, so a link tag's cells skip theirs 2158 const in_anchor = if (open_tag) |t| t == .a else false; 2159 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2160 if (!sameLink(link, open_link)) { 2161 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2162 if (link) |url| { 2163 try output.appendSlice(allocator, "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2164 try appendEscapedHtml(allocator, output, url); 2165 try output.appendSlice(allocator, "\">"); 2166 } 2167 open_link = link; 2168 } 2169 2170 if (covered_by_scroll) { 2171 try appendEscapedHtml(allocator, output, " "); 2172 } else if (cell.continuation) { 2173 // the wide rune to the left was emitted 2ch wide, covering this column 2174 } else if (cell.rune) |rune| { 2175 var encoded: [4]u8 = undefined; 2176 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2177 const rune_text = encoded[0..encoded_len]; 2178 // a double-width rune is pinned inside a 2ch span so the 2179 // fallback glyph's advance width can't shift the rest of the row 2180 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2181 if (wide) { 2182 try output.appendSlice(allocator, "<span class=\"w2\">"); 2183 try appendEscapedHtml(allocator, output, rune_text); 2184 try output.appendSlice(allocator, "</span>"); 2185 } else { 2186 try appendEscapedHtml(allocator, output, rune_text); 2187 } 2188 } else { 2189 try appendEscapedHtml(allocator, output, " "); 2190 } 2191 } 2192 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2193 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2194 try output.append(allocator, '\n'); 2195 } 2196 try output.appendSlice(allocator, "</div>"); 2197 2198 // native controls live in their panel, beside the replaceable cells. their 2199 // stable keys let JS update layout without recreating their DOM nodes, and 2200 // being actual descendants of a scroll gives them native movement/clipping. 2201 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2202 2203 // each child scroll becomes a natively-scrollable div positioned over its 2204 // viewport, holding its full content rendered recursively. 2205 for (direct.items) |id| { 2206 const child = focus.children.get(id) orelse continue; 2207 const info = child.focus.scroll orelse continue; 2208 const r = child.rect; 2209 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2210 // when that axis actually overflows. the other axis is clipped (hidden), 2211 // matching how the terminal Scroll handles its non-scrolling axis. 2212 const overflow = switch (info.direction) { 2213 .vert => "overflow-x:hidden;overflow-y:auto", 2214 .horiz => "overflow-x:auto;overflow-y:hidden", 2215 .both => "overflow:auto", 2216 }; 2217 // the id carries a content version so JS preserves the native scroll 2218 // position across re-renders of the same content but resets it when the 2219 // content is replaced — e.g. selecting a different commit. the widget's 2220 // scroll offset (in cells) rides along so JS can apply it when it has no 2221 // preserved position, letting a wasm-side scrollToRect (the files list 2222 // scrolling to its selected row on page load) reach the browser. 2223 var buf: [256]u8 = undefined; 2224 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 })); 2225 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2226 try output.appendSlice(allocator, "</div>"); 2227 } 2228 } 2229 2230 const form_prefix = "form:"; 2231 const form_id_prefix = "haxy-form-"; 2232 2233 fn formAction(focus: *const Focus) ?[]const u8 { 2234 return switch (focus.kind) { 2235 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2236 else => null, 2237 }; 2238 } 2239 2240 // find the form ancestor of a flattened focus-tree child. html's `form` 2241 // attribute then associates the control with that form without requiring the 2242 // form and control to share a DOM parent. 2243 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2244 var id = focus_id; 2245 while (root_focus.children.get(id)) |child| { 2246 const parent_id = child.parent_id; 2247 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2248 const parent = root_focus.children.get(parent_id) orelse return null; 2249 if (formAction(parent.focus) != null) return parent_id; 2250 id = parent_id; 2251 } 2252 return null; 2253 } 2254 2255 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2256 const form_id = formOwner(root_focus, focus_id) orelse return; 2257 var buf: [64]u8 = undefined; 2258 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2259 } 2260 2261 fn renderPanelControls( 2262 allocator: std.mem.Allocator, 2263 output: *std.ArrayList(u8), 2264 focus: *Focus, 2265 session: *ui.Session, 2266 root_focus: *Focus, 2267 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2268 ) !void { 2269 var iter = focus.children.iterator(); 2270 while (iter.next()) |entry| { 2271 const id = entry.key_ptr.*; 2272 if (excluded.contains(id)) continue; 2273 const child = entry.value_ptr.*; 2274 const r = child.rect; 2275 2276 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2277 2278 switch (child.focus.kind) { 2279 .text_input, .text_input_password, .text_area => { 2280 const ti = session.text_inputs.get(id) orelse continue; 2281 2282 const inner_left = r.x + 1; 2283 const inner_top = r.y + 1; 2284 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2285 const preserve = !ti.options.read_only; 2286 2287 if (child.focus.kind == .text_area) { 2288 const value = try ti.text(allocator); 2289 defer allocator.free(value); 2290 var id_buf: [128]u8 = undefined; 2291 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ 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 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2300 var pos_buf: [128]u8 = undefined; 2301 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 })); 2302 try appendEscapedHtml(allocator, output, value); 2303 try output.appendSlice(allocator, "</textarea>"); 2304 continue; 2305 } 2306 2307 var id_buf: [160]u8 = undefined; 2308 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 })); 2309 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2310 try appendFormAttribute(allocator, output, root_focus, id); 2311 if (ti.options.name.len > 0) { 2312 try output.appendSlice(allocator, " name=\""); 2313 try appendEscapedHtml(allocator, output, ti.options.name); 2314 try output.append(allocator, '"'); 2315 } 2316 if (child.focus.kind != .text_input_password) { 2317 const value = try ti.text(allocator); 2318 defer allocator.free(value); 2319 try output.appendSlice(allocator, " value=\""); 2320 try appendEscapedHtml(allocator, output, value); 2321 try output.append(allocator, '"'); 2322 } 2323 var pos_buf: [96]u8 = undefined; 2324 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 })); 2325 }, 2326 .custom => |custom| { 2327 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2328 if (formOwner(root_focus, id) == null) continue; 2329 var id_buf: [128]u8 = undefined; 2330 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2331 try appendFormAttribute(allocator, output, root_focus, id); 2332 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2333 try output.appendSlice(allocator, " formaction=\""); 2334 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2335 try output.append(allocator, '"'); 2336 } 2337 var pos_buf: [128]u8 = undefined; 2338 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 })); 2339 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2340 // an invisible native radio over the option, checked when the option is its row's selection 2341 const field = custom[ui.radio_prefix.len..]; 2342 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2343 const row = root_focus.children.get(child.parent_id) orelse continue; 2344 var id_buf: [128]u8 = undefined; 2345 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2346 try appendFormAttribute(allocator, output, root_focus, id); 2347 try output.appendSlice(allocator, " name=\""); 2348 try appendEscapedHtml(allocator, output, field[0..separator]); 2349 try output.appendSlice(allocator, "\" value=\""); 2350 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2351 try output.append(allocator, '"'); 2352 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2353 var pos_buf: [128]u8 = undefined; 2354 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 })); 2355 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2356 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2357 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2358 var id_buf: [128]u8 = undefined; 2359 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 })); 2360 } 2361 }, 2362 else => {}, 2363 } 2364 } 2365 } 2366 2367 // emit hidden form owners beside the rendered panels. their controls point 2368 // back here with the standard HTML `form` attribute. 2369 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2370 // the focus child map preserves insertion order, which matches the order 2371 // widgets were added in code 2372 var iter = root_focus.children.iterator(); 2373 while (iter.next()) |entry| { 2374 const child = entry.value_ptr.*; 2375 const action_url = formAction(child.focus) orelse continue; 2376 2377 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2378 var id_buf: [96]u8 = undefined; 2379 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2380 try appendEscapedHtml(allocator, output, action_url); 2381 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2382 } 2383 } 2384 2385 // the 16 ansi colors as the browser shows them (xterm's defaults) 2386 const ansi_palette = [16]Grid.Color.Rgb{ 2387 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2388 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2389 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2390 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2391 }; 2392 2393 // resolve any color to rgb: palette colors through the ansi table and the 2394 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2395 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2396 return switch (color) { 2397 .rgb => |c| c, 2398 .ansi => |a| ansi_palette[@intFromEnum(a)], 2399 .indexed => |n| if (n < 16) 2400 ansi_palette[n] 2401 else if (n < 232) blk: { 2402 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2403 const i = n - 16; 2404 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2405 } else blk: { 2406 const v: u8 = 8 + (n - 232) * 10; 2407 break :blk .{ .r = v, .g = v, .b = v }; 2408 }, 2409 }; 2410 } 2411 2412 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2413 // cell's style into `buf`, omitting whichever color is unset. an inverted 2414 // cell swaps the two, falling back to the page's --fg/--bg variables for 2415 // whichever side is unset. text attributes follow the colors. returns an 2416 // empty slice when nothing is set. 2417 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2418 if (style.eql(.{})) return buf[0..0]; 2419 const prefix = " style=\""; 2420 @memcpy(buf[0..prefix.len], prefix); 2421 var i: usize = prefix.len; 2422 const inverted = style.inverted; 2423 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2424 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2425 const decoration: []const u8 = if (style.underline and style.strikethrough) 2426 "text-decoration:underline line-through;" 2427 else if (style.underline) 2428 "text-decoration:underline;" 2429 else if (style.strikethrough) 2430 "text-decoration:line-through;" 2431 else 2432 ""; 2433 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2434 if (style.bold) "font-weight:bold;" else "", 2435 if (style.italic) "font-style:italic;" else "", 2436 decoration, 2437 if (style.dim) "opacity:.6;" else "", 2438 }) catch return buf[0..0]; 2439 i += attributes.len; 2440 if (i >= buf.len) return buf[0..0]; 2441 buf[i] = '"'; 2442 return buf[0 .. i + 1]; 2443 } 2444 2445 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2446 // the color is unset (nothing when both are). returns the new end, or null 2447 // when it doesn't fit. 2448 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2449 const s = if (color) |c| blk: { 2450 const v = colorRgb(c); 2451 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; 2452 } else if (fallback) |f| 2453 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2454 else 2455 return i; 2456 return i + s.len; 2457 } 2458 2459 // a cell's link as an href, when it's a web or mail url 2460 fn webLink(link: ?[]const u8) ?[]const u8 { 2461 const url = link orelse return null; 2462 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2463 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2464 } 2465 return null; 2466 } 2467 2468 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2469 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2470 return b == null; 2471 } 2472 2473 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2474 for (input) |ch| { 2475 switch (ch) { 2476 '&' => try out.appendSlice(allocator, "&amp;"), 2477 '<' => try out.appendSlice(allocator, "&lt;"), 2478 '>' => try out.appendSlice(allocator, "&gt;"), 2479 '"' => try out.appendSlice(allocator, "&quot;"), 2480 '\'' => try out.appendSlice(allocator, "&#39;"), 2481 else => try out.append(allocator, ch), 2482 } 2483 } 2484 } 2485 2486 // --- helpers -------------------------------------------------------------- 2487 2488 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2489 var iter = request.iterateHeaders(); 2490 while (iter.next()) |header| { 2491 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2492 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2493 while (pairs.next()) |pair| { 2494 const trimmed = std.mem.trim(u8, pair, " \t"); 2495 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2496 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2497 return trimmed[eq + 1 ..]; 2498 } 2499 } 2500 } 2501 return null; 2502 } 2503 2504 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2505 var iter = std.mem.splitScalar(u8, body, '&'); 2506 while (iter.next()) |pair| { 2507 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2508 if (std.mem.eql(u8, pair[0..eq], key)) { 2509 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2510 } 2511 } 2512 return null; 2513 } 2514 2515 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2516 var buffer: [256]u8 = undefined; 2517 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2518 } 2519 2520 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2521 var out: std.ArrayList(u8) = .empty; 2522 errdefer out.deinit(allocator); 2523 var i: usize = 0; 2524 while (i < encoded.len) : (i += 1) { 2525 switch (encoded[i]) { 2526 '+' => try out.append(allocator, ' '), 2527 '%' => { 2528 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2529 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2530 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2531 try out.append(allocator, hi * 16 + lo); 2532 i += 2; 2533 }, 2534 else => try out.append(allocator, encoded[i]), 2535 } 2536 } 2537 return try out.toOwnedSlice(allocator); 2538 } 2539 2540 // disk-backed web session store. each login mints a random, opaque token 2541 // (not the user's id) that is stored as a file named by the token hex, whose 2542 // contents are the raw user_id bytes. authenticating a request is a lookup of 2543 // the cookie's token; logout deletes the file, revoking the session. there is 2544 // deliberately no expiry — a session lives until logout. form failures use 2545 // files in the flash subdirectory that the redirected GET consumes. the 2546 // directory is cleared whenever the server starts. 2547 pub const SessionStore = struct { 2548 io: std.Io, 2549 dir: std.Io.Dir, 2550 flash_dir: std.Io.Dir, 2551 auto_login: ?[token_hex_len]u8, 2552 2553 pub const token_hex_len = evt.event_id_size * 2; 2554 2555 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2556 try data_dir.createDirPath(io, "sessions"); 2557 const dir = try data_dir.openDir(io, "sessions", .{}); 2558 errdefer dir.close(io); 2559 try dir.deleteTree(io, "flash"); 2560 try dir.createDirPath(io, "flash"); 2561 const flash_dir = try dir.openDir(io, "flash", .{}); 2562 errdefer flash_dir.close(io); 2563 const auto_login = blk: { 2564 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2565 defer file.close(io); 2566 var token: [token_hex_len]u8 = undefined; 2567 var storage: [token_hex_len]u8 = undefined; 2568 var reader = file.reader(io, &storage); 2569 reader.interface.readSliceAll(&token) catch break :blk null; 2570 break :blk token; 2571 }; 2572 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2573 } 2574 2575 pub fn deinit(self: SessionStore) void { 2576 self.flash_dir.close(self.io); 2577 self.dir.close(self.io); 2578 } 2579 2580 // mint a new session for user_id, returning the token hex to set as the 2581 // cookie value. 2582 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2583 var token: [evt.event_id_size]u8 = undefined; 2584 self.io.random(&token); 2585 const token_hex = std.fmt.bytesToHex(token, .lower); 2586 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2587 defer file.close(self.io); 2588 try file.writeStreamingAll(self.io, user_id); 2589 return token_hex; 2590 } 2591 2592 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2593 var token: [evt.event_id_size]u8 = undefined; 2594 self.io.random(&token); 2595 const token_hex = std.fmt.bytesToHex(token, .lower); 2596 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2597 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2598 defer file.close(self.io); 2599 2600 var json: std.Io.Writer.Allocating = .init(allocator); 2601 defer json.deinit(); 2602 try std.json.Stringify.value(value, .{}, &json.writer); 2603 try file.writeStreamingAll(self.io, json.written()); 2604 return token_hex; 2605 } 2606 2607 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2608 if (!isToken(token_hex)) return null; 2609 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2610 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2611 defer file.close(self.io); 2612 2613 var storage: [4096]u8 = undefined; 2614 var reader = file.reader(self.io, &storage); 2615 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2616 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2617 } 2618 2619 // resolve a cookie's token to its user_id. returns false (logged out) for a 2620 // missing, malformed, or unknown token. 2621 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2622 if (!isToken(token_hex)) return false; 2623 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2624 defer file.close(self.io); 2625 var storage: [evt.event_id_size]u8 = undefined; 2626 var file_reader = file.reader(self.io, &storage); 2627 file_reader.interface.readSliceAll(out) catch return false; 2628 return true; 2629 } 2630 2631 // revoke a session. a no-op for a missing or malformed token. 2632 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2633 if (!isToken(token_hex)) return; 2634 self.dir.deleteFile(self.io, token_hex) catch {}; 2635 } 2636 2637 // leave `token_hex`'s session for visitors arriving without one. only the 2638 // `try` fixture writes one. the name can't collide with a session token. 2639 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2640 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2641 defer file.close(self.io); 2642 try file.writeStreamingAll(self.io, token_hex); 2643 } 2644 2645 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2646 out.* = self.auto_login orelse return false; 2647 return true; 2648 } 2649 2650 const auto_login_name = "auto-login"; 2651 2652 // a token is exactly token_hex_len hex chars. validating before using the 2653 // value as a path keeps attacker-supplied cookies from escaping the 2654 // sessions dir (e.g. via "/" or ".." bytes). 2655 fn isToken(token_hex: []const u8) bool { 2656 if (token_hex.len != token_hex_len) return false; 2657 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2658 return true; 2659 } 2660 }; 2661