╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭e773cb53..╮ e773cb53.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (613) 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 │ ╰─────────────────────────────────╯
1657 .extra_headers = &.{.{ .name = "location", .value = base }}, 1658 }); 1659 } 1660 1661 // resolve every conflicted field of the thread the url names 1662 fn handleThreadResolve( 1663 io: std.Io, 1664 request: *std.http.Server.Request, 1665 allocator: std.mem.Allocator, 1666 base: []const u8, 1667 host: Host, 1668 ) !void { 1669 const parts = commentBaseParts(base) orelse { 1670 try request.respond("thread not found", .{ 1671 .status = .not_found, 1672 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1673 }); 1674 return; 1675 }; 1676 1677 var author_arena = std.heap.ArenaAllocator.init(allocator); 1678 defer author_arena.deinit(); 1679 const author = ((try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .write)) orelse return).author; 1680 1681 const body = try readFormBody(request, allocator); 1682 defer allocator.free(body); 1683 1684 var field_arena = std.heap.ArenaAllocator.init(allocator); 1685 defer field_arena.deinit(); 1686 const aa = field_arena.allocator(); 1687 const title = try parseFormField(aa, body, "title"); 1688 const labels = try parseFormField(aa, body, "labels"); 1689 1690 // the hunk inputs are submitted as d0, d1, ...; form submission normalizes their 1691 // textarea line breaks to CRLF 1692 var hunks: std.ArrayList([]const u8) = .empty; 1693 var hunk_index: usize = 0; 1694 while (true) : (hunk_index += 1) { 1695 const name = try std.fmt.allocPrint(aa, "d{d}", .{hunk_index}); 1696 const submitted = (try parseFormField(aa, body, name)) orelse break; 1697 try hunks.append(aa, try std.mem.replaceOwned(u8, aa, submitted, "\r\n", "\n")); 1698 } 1699 1700 if (parts.comment_id != null or (parts.thread_kind != .issue and parts.thread_kind != .patch)) { 1701 try request.respond("thread not found", .{ 1702 .status = .not_found, 1703 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1704 }); 1705 return; 1706 } 1707 const route = ui.RoutablePage.fromUrl(base) orelse ui.RoutablePage.fromUrlLocal(base) orelse { 1708 try request.respond("thread not found", .{ 1709 .status = .not_found, 1710 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1711 }); 1712 return; 1713 }; 1714 const theirs: []const u8 = switch (route) { 1715 .repo_patches => |*patch| patch.theirs.slice(), 1716 .repo_issues => "", 1717 else => unreachable, 1718 }; 1719 const not_found = if (parts.thread_kind == .patch) "patch not found" else "issue not found"; 1720 1721 (switch (parts.thread_kind) { 1722 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1723 .title = title, 1724 .labels = labels, 1725 .hunks = hunks.items, 1726 } }, author), 1727 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1728 .title = title, 1729 .labels = labels, 1730 .hunks = hunks.items, 1731 .theirs = theirs, 1732 } }, author), 1733 else => unreachable, 1734 }) catch |err| switch (err) { 1735 error.NotFound => { 1736 try request.respond(not_found, .{ 1737 .status = .not_found, 1738 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1739 }); 1740 return; 1741 }, 1742 // invalid fields send the user back to the resolve form 1743 error.InvalidFields => { 1744 const form_location = try std.fmt.allocPrint(allocator, "{s}/resolve", .{base}); 1745 defer allocator.free(form_location); 1746 try request.respond("", .{ 1747 .status = .see_other, 1748 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1749 }); 1750 return; 1751 }, 1752 else => |e| return e, 1753 }; 1754 1755 try request.respond("", .{ 1756 .status = .see_other, 1757 .extra_headers = &.{.{ .name = "location", .value = base }}, 1758 }); 1759 } 1760 1761 // the posted path drops the action's own segment, so the route it parses is 1762 // the undo page the action applies to, never the confirmation page itself 1763 fn handleUndo(io: std.Io, request: *std.http.Server.Request, allocator: std.mem.Allocator, base: []const u8, host: Host, action: enum { undo, clear }) !void { 1764 const route = (switch (host) { 1765 .local => ui.RoutablePage.fromUrlLocal(base), 1766 .server => ui.RoutablePage.fromUrl(base), 1767 }) orelse return respondRepoNotFound(request); 1768 if (route != .repo_undo) return respondRepoNotFound(request); 1769 const target = route.repo_undo; 1770 var arena = std.heap.ArenaAllocator.init(allocator); 1771 defer arena.deinit(); 1772 const repo_base = if (target.name.len == 0) "" else try std.fmt.allocPrint(arena.allocator(), "/repo/{s}", .{target.name.slice()}); 1773 _ = (try authorizeWrite(io, allocator, &arena, request, host, repo_base, .owner)) orelse return; 1774 const resolved = (try requestRepoSource(io, allocator, host, repo_base)) orelse return respondRepoNotFound(request); 1775 defer resolved.deinit(allocator); 1776 (switch (action) { 1777 .undo => ui.Repo.Undo.execute(io, allocator, resolved.source, target.index orelse return respondRepoNotFound(request)), 1778 .clear => ui.Repo.Undo.clearHistory(io, allocator, resolved.source), 1779 }) catch |err| switch (err) { 1780 error.NotFound, error.InvalidHistoryIndex, error.TransactionNotFound => return respondRepoNotFound(request), 1781 else => return err, 1782 }; 1783 const location = try (ui.RoutablePage.repoUndoRoute(target.name.slice(), null) orelse return error.RouteTooLong).toUrl(&arena); 1784 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = location }} }); 1785 } 1786 1787 fn handleSync( 1788 io: std.Io, 1789 request: *std.http.Server.Request, 1790 allocator: std.mem.Allocator, 1791 base: []const u8, 1792 source: ui.RepoSource, 1793 ) !void { 1794 if (base.len != 0) { 1795 try request.respond("not found", .{ 1796 .status = .not_found, 1797 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1798 }); 1799 return; 1800 } 1801 1802 var owned_failure: ?[]u8 = null; 1803 defer if (owned_failure) |message| allocator.free(message); 1804 const failure: ?[]const u8 = blk: { 1805 owned_failure = ui.Repo.Events.sync(io, allocator, source) catch |err| break :blk @errorName(err); 1806 break :blk owned_failure; 1807 }; 1808 if (failure) |message| { 1809 var encoded: std.Io.Writer.Allocating = .init(allocator); 1810 defer encoded.deinit(); 1811 try std.Uri.Component.percentEncode(&encoded.writer, message, struct { 1812 fn isUnreserved(c: u8) bool { 1813 return std.ascii.isAlphanumeric(c) or c == '-' or c == '.' or c == '_' or c == '~'; 1814 } 1815 }.isUnreserved); 1816 const cookie = try std.fmt.allocPrint( 1817 allocator, 1818 local_flash_cookie ++ "=" ++ local_sync_failure_prefix ++ "{s}; Path=/; HttpOnly; SameSite=Strict", 1819 .{encoded.written()}, 1820 ); 1821 defer allocator.free(cookie); 1822 try request.respond("", .{ 1823 .status = .see_other, 1824 .extra_headers = &.{ 1825 .{ .name = "location", .value = "/events" }, 1826 .{ .name = "set-cookie", .value = cookie }, 1827 }, 1828 }); 1829 return; 1830 } 1831 1832 try request.respond("", .{ 1833 .status = .see_other, 1834 .extra_headers = &.{ 1835 .{ .name = "location", .value = "/events" }, 1836 .{ .name = "set-cookie", .value = local_flash_cookie ++ "=; Path=/; Max-Age=0" }, 1837 }, 1838 }); 1839 } 1840 1841 fn renderIndexHtml( 1842 io: std.Io, 1843 allocator: std.mem.Allocator, 1844 host: Host, 1845 session_token: ?[]const u8, 1846 session_data: ui.Session.Data, 1847 ) ![]const u8 { 1848 const template = (findEmbed("/index.html") orelse return error.MissingIndexAsset).body; 1849 1850 var page_arena = std.heap.ArenaAllocator.init(allocator); 1851 defer page_arena.deinit(); 1852 1853 // the server admin repo must outlive the page build, since the session's 1854 // moment reads from it. 1855 var repo_maybe: ?rp.Repo(.xit, evt.admin_repo_opts) = null; 1856 defer if (repo_maybe) |*repo| repo.deinit(io, allocator); 1857 1858 var session = switch (host) { 1859 .server => |server| blk: { 1860 // open the admin repo to read live user/repo data. 1861 repo_maybe = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1862 const repo = if (repo_maybe) |*repo| repo else unreachable; 1863 var session = try ui.Session.init(&page_arena, repo, session_data); 1864 // the session dropped a user whose account was removed, so revoke 1865 // the token that named them 1866 if (session_token) |token| { 1867 if (session.data.user_id == null) server.session_store.remove(token); 1868 } 1869 // give the page builders filesystem access to the on-disk repos (a 1870 // sibling "users" dir next to the admin repo) so the Repo page can 1871 // read its files. 1872 session.users_dir = server.users_dir; 1873 break :blk session; 1874 }, 1875 .local => |local| ui.Session{ 1876 .data = session_data, 1877 .arena = &page_arena, 1878 .page_arena = &page_arena, 1879 .local = local, 1880 }, 1881 }; 1882 session.io = io; 1883 1884 var page = try ui.Page.init(session.page_arena, &session, session.data.current_page); 1885 var root = try ui.initRoot(allocator, &page, &session); 1886 defer root.deinit(allocator); 1887 1888 const snapshot: ui.Snapshot = .{ .page = page, .session = session.data }; 1889 1890 const content = try generateHtml(allocator, &root, &session); 1891 defer allocator.free(content); 1892 1893 // serialize the snapshot so the wasm side can parse it back without making 1894 // a second request. it's embedded raw in a <script type="application/json"> 1895 // block, whose content is raw text terminated only by "</script". in json, 1896 // '<' appears solely inside string values, so escaping every '<' (and '>' 1897 // for good measure) to its \uXXXX form yields equivalent json that can't 1898 // break out of the tag. 1899 var json: std.Io.Writer.Allocating = .init(allocator); 1900 defer json.deinit(); 1901 try std.json.Stringify.value(snapshot, .{}, &json.writer); 1902 1903 var json_escaped: std.ArrayList(u8) = .empty; 1904 defer json_escaped.deinit(allocator); 1905 for (json.written()) |c| switch (c) { 1906 '<' => try json_escaped.appendSlice(allocator, "\\u003c"), 1907 '>' => try json_escaped.appendSlice(allocator, "\\u003e"), 1908 else => try json_escaped.append(allocator, c), 1909 }; 1910 1911 var out: std.ArrayList(u8) = .empty; 1912 errdefer out.deinit(allocator); 1913 { 1914 var cursor: usize = 0; 1915 for (&[_]struct { needle: []const u8, replacement: []const u8 }{ 1916 .{ .needle = "{{{ HAXY_HTML }}}", .replacement = content }, 1917 .{ .needle = "{{{ HAXY_JSON }}}", .replacement = json_escaped.items }, 1918 }) |sub| { 1919 const idx = std.mem.indexOfPos(u8, template, cursor, sub.needle) orelse return error.MissingTemplateToken; 1920 try out.appendSlice(allocator, template[cursor..idx]); 1921 try out.appendSlice(allocator, sub.replacement); 1922 cursor = idx + sub.needle.len; 1923 } 1924 try out.appendSlice(allocator, template[cursor..]); 1925 } 1926 return try out.toOwnedSlice(allocator); 1927 } 1928 1929 fn findEmbed(request_path: []const u8) ?Embed { 1930 const path = if (std.mem.eql(u8, request_path, "/")) 1931 "index.html" 1932 else if (request_path.len > 1 and request_path[0] == '/') 1933 request_path[1..] 1934 else 1935 return null; 1936 1937 for (embeds) |embed| { 1938 if (std.mem.eql(u8, path, embed.path)) return embed; 1939 } 1940 return null; 1941 } 1942 1943 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 1944 // own absolutely-positioned, natively-scrollable <div> holding its full content, 1945 // rendered recursively so nested scrolls work. 1946 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 1947 const grid = root.getGrid() orelse return error.MissingGrid; 1948 const root_focus = root.getFocus(); 1949 1950 var out: std.ArrayList(u8) = .empty; 1951 errdefer out.deinit(allocator); 1952 1953 switch (root.*) { 1954 .background => |*background| { 1955 if (background.art.getGrid()) |art| { 1956 var position_buf: [64]u8 = undefined; 1957 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})); 1958 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 1959 try out.appendSlice(allocator, "</div>"); 1960 } 1961 }, 1962 else => {}, 1963 } 1964 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 1965 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 1966 try out.appendSlice(allocator, "</div>"); 1967 try renderForms(allocator, &out, root_focus); 1968 return try out.toOwnedSlice(allocator); 1969 } 1970 1971 // render one panel — a focus subtree and its content grid — as HTML, recursing 1972 // once per web-native Scroll inside it. the root panel is the whole page; each 1973 // Scroll becomes a nested, natively-scrollable div holding its full content. 1974 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 1975 // then the child scroll divs over those holes. 1976 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 1977 // `direct` is this panel's scroll children, each drawn as an overlaid div. 1978 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 1979 // plus their descendants, which the focus tree flattens into this panel's 1980 // children): the cell hit-test below skips them so this panel doesn't claim 1981 // cells that are really rendered inside a child scroll's own panel. 1982 // (scrolls aren't nested in practice, so every scroll child is direct here.) 1983 var direct: std.ArrayList(usize) = .empty; 1984 defer direct.deinit(allocator); 1985 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 1986 defer excluded.deinit(allocator); 1987 { 1988 var it = focus.children.iterator(); 1989 while (it.next()) |e| { 1990 if (e.value_ptr.focus.scroll == null) continue; 1991 try direct.append(allocator, e.key_ptr.*); 1992 try excluded.put(allocator, e.key_ptr.*, {}); 1993 var mit = e.value_ptr.focus.children.iterator(); 1994 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 1995 } 1996 } 1997 1998 // the HTML element a run of cells is wrapped in, chosen from the cell's 1999 // focusable kind 2000 const CellTag = union(enum) { 2001 span, // clickable focusable cell 2002 a: []const u8, // clickable focusable link 2003 plain, // non-focusable, colored 2004 2005 const a_prefix = "a:"; 2006 // an "in-page" anchor: rendered as a real <a href> so it works with js 2007 // disabled, but wasm handles it without navigating. 2008 fn init(str: []const u8) @This() { 2009 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2010 return .{ .a = str[ui.raw_link_prefix.len..] }; 2011 } 2012 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2013 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2014 } 2015 if (std.mem.startsWith(u8, str, a_prefix)) { 2016 return .{ .a = str[a_prefix.len..] }; 2017 } 2018 return .span; 2019 } 2020 2021 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2022 var id_buf: [32]u8 = undefined; 2023 switch (self) { 2024 .span => { 2025 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2026 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2027 try out.appendSlice(alloc, "\""); 2028 try out.appendSlice(alloc, style_attr); 2029 try out.appendSlice(alloc, ">"); 2030 }, 2031 .a => |href| { 2032 // tabindex=-1 keeps these out of the browser's tab order 2033 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2034 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2035 try out.appendSlice(alloc, "\" href=\""); 2036 try appendEscapedHtml(alloc, out, href); 2037 try out.appendSlice(alloc, "\""); 2038 try out.appendSlice(alloc, style_attr); 2039 try out.appendSlice(alloc, ">"); 2040 }, 2041 .plain => { 2042 try out.appendSlice(alloc, "<span"); 2043 try out.appendSlice(alloc, style_attr); 2044 try out.appendSlice(alloc, ">"); 2045 }, 2046 } 2047 } 2048 2049 fn closeTag(self: @This()) []const u8 { 2050 return switch (self) { 2051 .span, .plain => "</span>", 2052 .a => "</a>", 2053 }; 2054 } 2055 }; 2056 2057 // the focusable owning each cell, among this panel's own (skipping any 2058 // that belong to a child scroll, whose cells are drawn in their own panel). 2059 // claimed in focus order, so the first focusable over a cell keeps it. 2060 // looking every focusable up for every cell is quadratic in a long list. 2061 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2062 defer allocator.free(owners); 2063 @memset(owners, null); 2064 { 2065 var it = focus.children.iterator(); 2066 while (it.next()) |entry| { 2067 const child = entry.value_ptr.*; 2068 if (child.focus.mode != .all) continue; 2069 if (excluded.contains(entry.key_ptr.*)) continue; 2070 const r = child.rect; 2071 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2072 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2073 const owner = &owners[y * grid.size.width + x]; 2074 if (owner.* == null) owner.* = entry.key_ptr.*; 2075 } 2076 } 2077 } 2078 } 2079 2080 // the cells are the volatile part of a panel. js replaces this one subtree 2081 // wholesale while retaining the panel's native controls and scroll shells. 2082 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2083 2084 // emit this panel's grid as rows of text, coalescing adjacent cells that 2085 // share a focus id and style into one tag (a clickable span, a link, or a 2086 // plain styled span). cells under a child scroll keep only their background. 2087 // a cell's own link is an anchor nested in that tag. 2088 for (0..grid.size.height) |y| { 2089 var cur_id: ?usize = null; 2090 var cur_style: Grid.Style = .{}; 2091 var open_tag: ?CellTag = null; 2092 var open_link: ?[]const u8 = null; 2093 var first = true; 2094 for (0..grid.size.width) |x| { 2095 const cell = (try grid.cell(x, y)).*; 2096 // a cell covered by a child scroll's viewport is drawn by that scroll's 2097 // own div, so blank its glyph and make it non-clickable here — but keep 2098 // its background, so the backdrop still shows through the scroll's 2099 // transparent div instead of a bare hole. 2100 const covered_by_scroll = blk: { 2101 for (direct.items) |id| { 2102 const r = (focus.children.get(id) orelse continue).rect; 2103 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; 2104 } 2105 break :blk false; 2106 }; 2107 // the focusable owning the cell at (x, y); none for a covered cell. 2108 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2109 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2110 2111 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2112 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2113 open_link = null; 2114 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2115 2116 var new_tag: ?CellTag = null; 2117 if (cell_id) |id| { 2118 if (focus.children.get(id)) |child| { 2119 new_tag = switch (child.focus.kind) { 2120 .custom => |custom| CellTag.init(custom), 2121 else => .span, 2122 }; 2123 } 2124 } 2125 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2126 2127 if (new_tag) |t| { 2128 var style_buf: [192]u8 = undefined; 2129 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2130 } 2131 2132 open_tag = new_tag; 2133 cur_id = cell_id; 2134 cur_style = style; 2135 first = false; 2136 } 2137 2138 // an anchor can't nest in another, so a link tag's cells skip theirs 2139 const in_anchor = if (open_tag) |t| t == .a else false; 2140 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2141 if (!sameLink(link, open_link)) { 2142 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2143 if (link) |url| { 2144 try output.appendSlice(allocator, "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2145 try appendEscapedHtml(allocator, output, url); 2146 try output.appendSlice(allocator, "\">"); 2147 } 2148 open_link = link; 2149 } 2150 2151 if (covered_by_scroll) { 2152 try appendEscapedHtml(allocator, output, " "); 2153 } else if (cell.continuation) { 2154 // the wide rune to the left was emitted 2ch wide, covering this column 2155 } else if (cell.rune) |rune| { 2156 var encoded: [4]u8 = undefined; 2157 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2158 const rune_text = encoded[0..encoded_len]; 2159 // a double-width rune is pinned inside a 2ch span so the 2160 // fallback glyph's advance width can't shift the rest of the row 2161 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2162 if (wide) { 2163 try output.appendSlice(allocator, "<span class=\"w2\">"); 2164 try appendEscapedHtml(allocator, output, rune_text); 2165 try output.appendSlice(allocator, "</span>"); 2166 } else { 2167 try appendEscapedHtml(allocator, output, rune_text); 2168 } 2169 } else { 2170 try appendEscapedHtml(allocator, output, " "); 2171 } 2172 } 2173 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2174 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2175 try output.append(allocator, '\n'); 2176 } 2177 try output.appendSlice(allocator, "</div>"); 2178 2179 // native controls live in their panel, beside the replaceable cells. their 2180 // stable keys let JS update layout without recreating their DOM nodes, and 2181 // being actual descendants of a scroll gives them native movement/clipping. 2182 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2183 2184 // each child scroll becomes a natively-scrollable div positioned over its 2185 // viewport, holding its full content rendered recursively. 2186 for (direct.items) |id| { 2187 const child = focus.children.get(id) orelse continue; 2188 const info = child.focus.scroll orelse continue; 2189 const r = child.rect; 2190 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2191 // when that axis actually overflows. the other axis is clipped (hidden), 2192 // matching how the terminal Scroll handles its non-scrolling axis. 2193 const overflow = switch (info.direction) { 2194 .vert => "overflow-x:hidden;overflow-y:auto", 2195 .horiz => "overflow-x:auto;overflow-y:hidden", 2196 .both => "overflow:auto", 2197 }; 2198 // the id carries a content version so JS preserves the native scroll 2199 // position across re-renders of the same content but resets it when the 2200 // content is replaced — e.g. selecting a different commit. the widget's 2201 // scroll offset (in cells) rides along so JS can apply it when it has no 2202 // preserved position, letting a wasm-side scrollToRect (the files list 2203 // scrolling to its selected row on page load) reach the browser. 2204 var buf: [256]u8 = undefined; 2205 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 })); 2206 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2207 try output.appendSlice(allocator, "</div>"); 2208 } 2209 } 2210 2211 const form_prefix = "form:"; 2212 const form_id_prefix = "haxy-form-"; 2213 2214 fn formAction(focus: *const Focus) ?[]const u8 { 2215 return switch (focus.kind) { 2216 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2217 else => null, 2218 }; 2219 } 2220 2221 // find the form ancestor of a flattened focus-tree child. html's `form` 2222 // attribute then associates the control with that form without requiring the 2223 // form and control to share a DOM parent. 2224 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2225 var id = focus_id; 2226 while (root_focus.children.get(id)) |child| { 2227 const parent_id = child.parent_id; 2228 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2229 const parent = root_focus.children.get(parent_id) orelse return null; 2230 if (formAction(parent.focus) != null) return parent_id; 2231 id = parent_id; 2232 } 2233 return null; 2234 } 2235 2236 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2237 const form_id = formOwner(root_focus, focus_id) orelse return; 2238 var buf: [64]u8 = undefined; 2239 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2240 } 2241 2242 fn renderPanelControls( 2243 allocator: std.mem.Allocator, 2244 output: *std.ArrayList(u8), 2245 focus: *Focus, 2246 session: *ui.Session, 2247 root_focus: *Focus, 2248 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2249 ) !void { 2250 var iter = focus.children.iterator(); 2251 while (iter.next()) |entry| { 2252 const id = entry.key_ptr.*; 2253 if (excluded.contains(id)) continue; 2254 const child = entry.value_ptr.*; 2255 const r = child.rect; 2256 2257 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2258 2259 switch (child.focus.kind) { 2260 .text_input, .text_input_password, .text_area => { 2261 const ti = session.text_inputs.get(id) orelse continue; 2262 2263 const inner_left = r.x + 1; 2264 const inner_top = r.y + 1; 2265 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2266 const preserve = !ti.options.read_only; 2267 2268 if (child.focus.kind == .text_area) { 2269 const value = try ti.text(allocator); 2270 defer allocator.free(value); 2271 var id_buf: [128]u8 = undefined; 2272 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2273 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2274 try appendFormAttribute(allocator, output, root_focus, id); 2275 if (ti.options.name.len > 0) { 2276 try output.appendSlice(allocator, " name=\""); 2277 try appendEscapedHtml(allocator, output, ti.options.name); 2278 try output.append(allocator, '"'); 2279 } 2280 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2281 var pos_buf: [128]u8 = undefined; 2282 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 })); 2283 try appendEscapedHtml(allocator, output, value); 2284 try output.appendSlice(allocator, "</textarea>"); 2285 continue; 2286 } 2287 2288 var id_buf: [160]u8 = undefined; 2289 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 })); 2290 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2291 try appendFormAttribute(allocator, output, root_focus, id); 2292 if (ti.options.name.len > 0) { 2293 try output.appendSlice(allocator, " name=\""); 2294 try appendEscapedHtml(allocator, output, ti.options.name); 2295 try output.append(allocator, '"'); 2296 } 2297 if (child.focus.kind != .text_input_password) { 2298 const value = try ti.text(allocator); 2299 defer allocator.free(value); 2300 try output.appendSlice(allocator, " value=\""); 2301 try appendEscapedHtml(allocator, output, value); 2302 try output.append(allocator, '"'); 2303 } 2304 var pos_buf: [96]u8 = undefined; 2305 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 })); 2306 }, 2307 .custom => |custom| { 2308 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2309 if (formOwner(root_focus, id) == null) continue; 2310 var id_buf: [128]u8 = undefined; 2311 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2312 try appendFormAttribute(allocator, output, root_focus, id); 2313 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2314 try output.appendSlice(allocator, " formaction=\""); 2315 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2316 try output.append(allocator, '"'); 2317 } 2318 var pos_buf: [128]u8 = undefined; 2319 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 })); 2320 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2321 // an invisible native radio over the option, checked when the option is its row's selection 2322 const field = custom[ui.radio_prefix.len..]; 2323 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2324 const row = root_focus.children.get(child.parent_id) orelse continue; 2325 var id_buf: [128]u8 = undefined; 2326 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2327 try appendFormAttribute(allocator, output, root_focus, id); 2328 try output.appendSlice(allocator, " name=\""); 2329 try appendEscapedHtml(allocator, output, field[0..separator]); 2330 try output.appendSlice(allocator, "\" value=\""); 2331 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2332 try output.append(allocator, '"'); 2333 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2334 var pos_buf: [128]u8 = undefined; 2335 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 })); 2336 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2337 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2338 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2339 var id_buf: [128]u8 = undefined; 2340 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 })); 2341 } 2342 }, 2343 else => {}, 2344 } 2345 } 2346 } 2347 2348 // emit hidden form owners beside the rendered panels. their controls point 2349 // back here with the standard HTML `form` attribute. 2350 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2351 // the focus child map preserves insertion order, which matches the order 2352 // widgets were added in code 2353 var iter = root_focus.children.iterator(); 2354 while (iter.next()) |entry| { 2355 const child = entry.value_ptr.*; 2356 const action_url = formAction(child.focus) orelse continue; 2357 2358 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2359 var id_buf: [96]u8 = undefined; 2360 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2361 try appendEscapedHtml(allocator, output, action_url); 2362 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2363 } 2364 } 2365 2366 // the 16 ansi colors as the browser shows them (xterm's defaults) 2367 const ansi_palette = [16]Grid.Color.Rgb{ 2368 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2369 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2370 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2371 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2372 }; 2373 2374 // resolve any color to rgb: palette colors through the ansi table and the 2375 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2376 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2377 return switch (color) { 2378 .rgb => |c| c, 2379 .ansi => |a| ansi_palette[@intFromEnum(a)], 2380 .indexed => |n| if (n < 16) 2381 ansi_palette[n] 2382 else if (n < 232) blk: { 2383 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2384 const i = n - 16; 2385 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2386 } else blk: { 2387 const v: u8 = 8 + (n - 232) * 10; 2388 break :blk .{ .r = v, .g = v, .b = v }; 2389 }, 2390 }; 2391 } 2392 2393 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2394 // cell's style into `buf`, omitting whichever color is unset. an inverted 2395 // cell swaps the two, falling back to the page's --fg/--bg variables for 2396 // whichever side is unset. text attributes follow the colors. returns an 2397 // empty slice when nothing is set. 2398 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2399 if (style.eql(.{})) return buf[0..0]; 2400 const prefix = " style=\""; 2401 @memcpy(buf[0..prefix.len], prefix); 2402 var i: usize = prefix.len; 2403 const inverted = style.inverted; 2404 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2405 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2406 const decoration: []const u8 = if (style.underline and style.strikethrough) 2407 "text-decoration:underline line-through;" 2408 else if (style.underline) 2409 "text-decoration:underline;" 2410 else if (style.strikethrough) 2411 "text-decoration:line-through;" 2412 else 2413 ""; 2414 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2415 if (style.bold) "font-weight:bold;" else "", 2416 if (style.italic) "font-style:italic;" else "", 2417 decoration, 2418 if (style.dim) "opacity:.6;" else "", 2419 }) catch return buf[0..0]; 2420 i += attributes.len; 2421 if (i >= buf.len) return buf[0..0]; 2422 buf[i] = '"'; 2423 return buf[0 .. i + 1]; 2424 } 2425 2426 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2427 // the color is unset (nothing when both are). returns the new end, or null 2428 // when it doesn't fit. 2429 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2430 const s = if (color) |c| blk: { 2431 const v = colorRgb(c); 2432 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; 2433 } else if (fallback) |f| 2434 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2435 else 2436 return i; 2437 return i + s.len; 2438 } 2439 2440 // a cell's link as an href, when it's a web or mail url 2441 fn webLink(link: ?[]const u8) ?[]const u8 { 2442 const url = link orelse return null; 2443 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2444 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2445 } 2446 return null; 2447 } 2448 2449 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2450 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2451 return b == null; 2452 } 2453 2454 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2455 for (input) |ch| { 2456 switch (ch) { 2457 '&' => try out.appendSlice(allocator, "&amp;"), 2458 '<' => try out.appendSlice(allocator, "&lt;"), 2459 '>' => try out.appendSlice(allocator, "&gt;"), 2460 '"' => try out.appendSlice(allocator, "&quot;"), 2461 '\'' => try out.appendSlice(allocator, "&#39;"), 2462 else => try out.append(allocator, ch), 2463 } 2464 } 2465 } 2466 2467 // --- helpers -------------------------------------------------------------- 2468 2469 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2470 var iter = request.iterateHeaders(); 2471 while (iter.next()) |header| { 2472 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2473 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2474 while (pairs.next()) |pair| { 2475 const trimmed = std.mem.trim(u8, pair, " \t"); 2476 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2477 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2478 return trimmed[eq + 1 ..]; 2479 } 2480 } 2481 } 2482 return null; 2483 } 2484 2485 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2486 var iter = std.mem.splitScalar(u8, body, '&'); 2487 while (iter.next()) |pair| { 2488 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2489 if (std.mem.eql(u8, pair[0..eq], key)) { 2490 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2491 } 2492 } 2493 return null; 2494 } 2495 2496 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2497 var buffer: [256]u8 = undefined; 2498 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2499 } 2500 2501 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2502 var out: std.ArrayList(u8) = .empty; 2503 errdefer out.deinit(allocator); 2504 var i: usize = 0; 2505 while (i < encoded.len) : (i += 1) { 2506 switch (encoded[i]) { 2507 '+' => try out.append(allocator, ' '), 2508 '%' => { 2509 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2510 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2511 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2512 try out.append(allocator, hi * 16 + lo); 2513 i += 2; 2514 }, 2515 else => try out.append(allocator, encoded[i]), 2516 } 2517 } 2518 return try out.toOwnedSlice(allocator); 2519 } 2520 2521 // disk-backed web session store. each login mints a random, opaque token 2522 // (not the user's id) that is stored as a file named by the token hex, whose 2523 // contents are the raw user_id bytes. authenticating a request is a lookup of 2524 // the cookie's token; logout deletes the file, revoking the session. there is 2525 // deliberately no expiry — a session lives until logout. form failures use 2526 // files in the flash subdirectory that the redirected GET consumes. the 2527 // directory is cleared whenever the server starts. 2528 pub const SessionStore = struct { 2529 io: std.Io, 2530 dir: std.Io.Dir, 2531 flash_dir: std.Io.Dir, 2532 auto_login: ?[token_hex_len]u8, 2533 2534 pub const token_hex_len = evt.event_id_size * 2; 2535 2536 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2537 try data_dir.createDirPath(io, "sessions"); 2538 const dir = try data_dir.openDir(io, "sessions", .{}); 2539 errdefer dir.close(io); 2540 try dir.deleteTree(io, "flash"); 2541 try dir.createDirPath(io, "flash"); 2542 const flash_dir = try dir.openDir(io, "flash", .{}); 2543 errdefer flash_dir.close(io); 2544 const auto_login = blk: { 2545 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2546 defer file.close(io); 2547 var token: [token_hex_len]u8 = undefined; 2548 var storage: [token_hex_len]u8 = undefined; 2549 var reader = file.reader(io, &storage); 2550 reader.interface.readSliceAll(&token) catch break :blk null; 2551 break :blk token; 2552 }; 2553 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2554 } 2555 2556 pub fn deinit(self: SessionStore) void { 2557 self.flash_dir.close(self.io); 2558 self.dir.close(self.io); 2559 } 2560 2561 // mint a new session for user_id, returning the token hex to set as the 2562 // cookie value. 2563 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2564 var token: [evt.event_id_size]u8 = undefined; 2565 self.io.random(&token); 2566 const token_hex = std.fmt.bytesToHex(token, .lower); 2567 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2568 defer file.close(self.io); 2569 try file.writeStreamingAll(self.io, user_id); 2570 return token_hex; 2571 } 2572 2573 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2574 var token: [evt.event_id_size]u8 = undefined; 2575 self.io.random(&token); 2576 const token_hex = std.fmt.bytesToHex(token, .lower); 2577 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2578 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2579 defer file.close(self.io); 2580 2581 var json: std.Io.Writer.Allocating = .init(allocator); 2582 defer json.deinit(); 2583 try std.json.Stringify.value(value, .{}, &json.writer); 2584 try file.writeStreamingAll(self.io, json.written()); 2585 return token_hex; 2586 } 2587 2588 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2589 if (!isToken(token_hex)) return null; 2590 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2591 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2592 defer file.close(self.io); 2593 2594 var storage: [4096]u8 = undefined; 2595 var reader = file.reader(self.io, &storage); 2596 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2597 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2598 } 2599 2600 // resolve a cookie's token to its user_id. returns false (logged out) for a 2601 // missing, malformed, or unknown token. 2602 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2603 if (!isToken(token_hex)) return false; 2604 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2605 defer file.close(self.io); 2606 var storage: [evt.event_id_size]u8 = undefined; 2607 var file_reader = file.reader(self.io, &storage); 2608 file_reader.interface.readSliceAll(out) catch return false; 2609 return true; 2610 } 2611 2612 // revoke a session. a no-op for a missing or malformed token. 2613 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2614 if (!isToken(token_hex)) return; 2615 self.dir.deleteFile(self.io, token_hex) catch {}; 2616 } 2617 2618 // leave `token_hex`'s session for visitors arriving without one. only the 2619 // `try` fixture writes one. the name can't collide with a session token. 2620 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2621 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2622 defer file.close(self.io); 2623 try file.writeStreamingAll(self.io, token_hex); 2624 } 2625 2626 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2627 out.* = self.auto_login orelse return false; 2628 return true; 2629 } 2630 2631 const auto_login_name = "auto-login"; 2632 2633 // a token is exactly token_hex_len hex chars. validating before using the 2634 // value as a path keeps attacker-supplied cookies from escaping the 2635 // sessions dir (e.g. via "/" or ".." bytes). 2636 fn isToken(token_hex: []const u8) bool { 2637 if (token_hex.len != token_hex_len) return false; 2638 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2639 return true; 2640 } 2641 }; 2642