╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭fd33531a..╮ fd33531a.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (642) 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 │ ╰─────────────────────────────────╯
1779 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1780 }); 1781 return; 1782 } 1783 const route = routeFromUrl(host, base) orelse { 1784 try request.respond("thread not found", .{ 1785 .status = .not_found, 1786 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1787 }); 1788 return; 1789 }; 1790 const theirs: []const u8 = switch (route) { 1791 .repo_patches => |*patch| patch.theirs.slice(), 1792 .repo_issues => "", 1793 else => unreachable, 1794 }; 1795 const not_found = if (parts.thread_kind == .patch) "patch not found" else "issue not found"; 1796 1797 (switch (parts.thread_kind) { 1798 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1799 .title = title, 1800 .labels = labels, 1801 .hunks = hunks.items, 1802 } }, author), 1803 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1804 .title = title, 1805 .labels = labels, 1806 .hunks = hunks.items, 1807 .theirs = theirs, 1808 } }, author), 1809 else => unreachable, 1810 }) catch |err| switch (err) { 1811 error.NotFound => { 1812 try request.respond(not_found, .{ 1813 .status = .not_found, 1814 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1815 }); 1816 return; 1817 }, 1818 // invalid fields send the user back to the resolve form 1819 error.InvalidFields => { 1820 const form_location = try allocator.print("{s}/resolve", .{base}); 1821 defer allocator.free(form_location); 1822 try request.respond("", .{ 1823 .status = .see_other, 1824 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1825 }); 1826 return; 1827 }, 1828 else => |e| return e, 1829 }; 1830 1831 try request.respond("", .{ 1832 .status = .see_other, 1833 .extra_headers = &.{.{ .name = "location", .value = base }}, 1834 }); 1835 } 1836 1837 // the posted path drops the action's own segment, so the route it parses is 1838 // the undo page the action applies to, never the confirmation page itself 1839 fn handleUndo(io: std.Io, request: *std.http.Server.Request, allocator: std.mem.Allocator, base: []const u8, host: Host, action: enum { undo, clear }) !void { 1840 const route = routeFromUrl(host, base) orelse return respondRepoNotFound(request); 1841 if (route != .repo_undo) return respondRepoNotFound(request); 1842 const target = route.repo_undo; 1843 var arena = std.heap.ArenaAllocator.init(allocator); 1844 defer arena.deinit(); 1845 const repo_base = if (target.name.len == 0) "" else try arena.allocator().print("/{s}", .{target.name.slice()}); 1846 _ = (try authorizeWrite(io, allocator, &arena, request, host, repo_base, .owner)) orelse return; 1847 const resolved = (try requestRepoSource(io, allocator, host, repo_base)) orelse return respondRepoNotFound(request); 1848 defer resolved.deinit(allocator); 1849 (switch (action) { 1850 .undo => ui.Repo.Undo.execute(io, allocator, resolved.source, target.index orelse return respondRepoNotFound(request)), 1851 .clear => ui.Repo.Undo.clearHistory(io, allocator, resolved.source), 1852 }) catch |err| switch (err) { 1853 error.NotFound, error.InvalidHistoryIndex, error.TransactionNotFound => return respondRepoNotFound(request), 1854 else => return err, 1855 }; 1856 const location = try (ui.RoutablePage.repoUndoRoute(target.name.slice(), null) orelse return error.RouteTooLong).toUrl(&arena); 1857 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = location }} }); 1858 } 1859 1860 fn handleSync( 1861 io: std.Io, 1862 request: *std.http.Server.Request, 1863 allocator: std.mem.Allocator, 1864 base: []const u8, 1865 source: ui.RepoSource, 1866 ) !void { 1867 if (base.len != 0) { 1868 try request.respond("not found", .{ 1869 .status = .not_found, 1870 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1871 }); 1872 return; 1873 } 1874 1875 var owned_failure: ?[]u8 = null; 1876 defer if (owned_failure) |message| allocator.free(message); 1877 const failure: ?[]const u8 = blk: { 1878 owned_failure = ui.Repo.Events.sync(io, allocator, source) catch |err| break :blk @errorName(err); 1879 break :blk owned_failure; 1880 }; 1881 if (failure) |message| { 1882 var encoded: std.Io.Writer.Allocating = .init(allocator); 1883 defer encoded.deinit(); 1884 try std.Uri.Component.percentEncode(&encoded.writer, message, struct { 1885 fn isUnreserved(c: u8) bool { 1886 return std.ascii.isAlphanumeric(c) or c == '-' or c == '.' or c == '_' or c == '~'; 1887 } 1888 }.isUnreserved); 1889 const cookie = try allocator.print( 1890 local_flash_cookie ++ "=" ++ local_sync_failure_prefix ++ "{s}; Path=/; HttpOnly; SameSite=Strict", 1891 .{encoded.written()}, 1892 ); 1893 defer allocator.free(cookie); 1894 try request.respond("", .{ 1895 .status = .see_other, 1896 .extra_headers = &.{ 1897 .{ .name = "location", .value = "/events" }, 1898 .{ .name = "set-cookie", .value = cookie }, 1899 }, 1900 }); 1901 return; 1902 } 1903 1904 try request.respond("", .{ 1905 .status = .see_other, 1906 .extra_headers = &.{ 1907 .{ .name = "location", .value = "/events" }, 1908 .{ .name = "set-cookie", .value = local_flash_cookie ++ "=; Path=/; Max-Age=0" }, 1909 }, 1910 }); 1911 } 1912 1913 fn renderIndexHtml( 1914 io: std.Io, 1915 allocator: std.mem.Allocator, 1916 host: Host, 1917 session_token: ?[]const u8, 1918 session_data: ui.Session.Data, 1919 ) ![]const u8 { 1920 const template = (findEmbed("/index.html") orelse return error.MissingIndexAsset).body; 1921 1922 var page_arena = std.heap.ArenaAllocator.init(allocator); 1923 defer page_arena.deinit(); 1924 1925 // the server admin repo must outlive the page build, since the session's 1926 // moment reads from it. 1927 var repo_maybe: ?rp.Repo(.xit, evt.admin_repo_opts) = null; 1928 defer if (repo_maybe) |*repo| repo.deinit(io, allocator); 1929 1930 var session = switch (host) { 1931 .server => |server| blk: { 1932 // open the admin repo to read live user/repo data. 1933 repo_maybe = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1934 const repo = if (repo_maybe) |*repo| repo else unreachable; 1935 var session = try ui.Session.init(&page_arena, repo, session_data); 1936 // the session dropped a user whose account was removed, so revoke 1937 // the token that named them 1938 if (session_token) |token| { 1939 if (session.data.user_id == null) server.session_store.remove(token); 1940 } 1941 // give the page builders filesystem access to the on-disk repos (a 1942 // sibling "users" dir next to the admin repo) so the Repo page can 1943 // read its files. 1944 session.users_dir = server.users_dir; 1945 break :blk session; 1946 }, 1947 .local => |local| ui.Session{ 1948 .data = session_data, 1949 .arena = &page_arena, 1950 .page_arena = &page_arena, 1951 .local = local, 1952 }, 1953 }; 1954 session.io = io; 1955 1956 var page = try ui.Page.init(session.page_arena, &session, session.data.current_page); 1957 var root = try ui.initRoot(allocator, &page, &session); 1958 defer root.deinit(allocator); 1959 1960 const snapshot: ui.Snapshot = .{ .page = page, .session = session.data }; 1961 1962 const content = try generateHtml(allocator, &root, &session); 1963 defer allocator.free(content); 1964 1965 // serialize the snapshot so the wasm side can parse it back without making 1966 // a second request. it's embedded raw in a <script type="application/json"> 1967 // block, whose content is raw text terminated only by "</script". in json, 1968 // '<' appears solely inside string values, so escaping every '<' (and '>' 1969 // for good measure) to its \uXXXX form yields equivalent json that can't 1970 // break out of the tag. 1971 var json: std.Io.Writer.Allocating = .init(allocator); 1972 defer json.deinit(); 1973 try std.json.Stringify.value(snapshot, .{}, &json.writer); 1974 1975 var json_escaped: std.ArrayList(u8) = .empty; 1976 defer json_escaped.deinit(allocator); 1977 for (json.written()) |c| switch (c) { 1978 '<' => try json_escaped.appendSlice(allocator, "\\u003c"), 1979 '>' => try json_escaped.appendSlice(allocator, "\\u003e"), 1980 else => try json_escaped.append(allocator, c), 1981 }; 1982 1983 var out: std.ArrayList(u8) = .empty; 1984 errdefer out.deinit(allocator); 1985 { 1986 var cursor: usize = 0; 1987 for (&[_]struct { needle: []const u8, replacement: []const u8 }{ 1988 .{ .needle = "{{{ HAXY_HTML }}}", .replacement = content }, 1989 .{ .needle = "{{{ HAXY_JSON }}}", .replacement = json_escaped.items }, 1990 }) |sub| { 1991 const idx = std.mem.indexOfPos(u8, template, cursor, sub.needle) orelse return error.MissingTemplateToken; 1992 try out.appendSlice(allocator, template[cursor..idx]); 1993 try out.appendSlice(allocator, sub.replacement); 1994 cursor = idx + sub.needle.len; 1995 } 1996 try out.appendSlice(allocator, template[cursor..]); 1997 } 1998 return try out.toOwnedSlice(allocator); 1999 } 2000 2001 fn findEmbed(request_path: []const u8) ?Embed { 2002 // embeds are matched before pages, so a dot keeps them from claiming a username or tab 2003 comptime for (embeds) |embed| { 2004 if (std.mem.indexOfScalar(u8, embed.path, '.') == null) @compileError("embed path needs a '.' so it can't shadow a page: " ++ embed.path); 2005 }; 2006 if (request_path.len < 2 or request_path[0] != '/') return null; 2007 const path = request_path[1..]; 2008 2009 for (embeds) |embed| { 2010 if (std.mem.eql(u8, path, embed.path)) return embed; 2011 } 2012 return null; 2013 } 2014 2015 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 2016 // own absolutely-positioned, natively-scrollable <div> holding its full content, 2017 // rendered recursively so nested scrolls work. 2018 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 2019 const grid = root.getGrid() orelse return error.MissingGrid; 2020 const root_focus = root.getFocus(); 2021 2022 var out: std.ArrayList(u8) = .empty; 2023 errdefer out.deinit(allocator); 2024 2025 switch (root.*) { 2026 .background => |*background| { 2027 if (background.art.getGrid()) |art| { 2028 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 }); 2029 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 2030 try out.appendSlice(allocator, "</div>"); 2031 } 2032 }, 2033 else => {}, 2034 } 2035 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 2036 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 2037 try out.appendSlice(allocator, "</div>"); 2038 try renderForms(allocator, &out, root_focus); 2039 return try out.toOwnedSlice(allocator); 2040 } 2041 2042 // render one panel — a focus subtree and its content grid — as HTML, recursing 2043 // once per web-native Scroll inside it. the root panel is the whole page; each 2044 // Scroll becomes a nested, natively-scrollable div holding its full content. 2045 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 2046 // then the child scroll divs over those holes. 2047 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 2048 // `direct` is this panel's scroll children, each drawn as an overlaid div. 2049 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 2050 // plus their descendants, which the focus tree flattens into this panel's 2051 // children): the cell hit-test below skips them so this panel doesn't claim 2052 // cells that are really rendered inside a child scroll's own panel. 2053 // (scrolls aren't nested in practice, so every scroll child is direct here.) 2054 var direct: std.ArrayList(usize) = .empty; 2055 defer direct.deinit(allocator); 2056 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 2057 defer excluded.deinit(allocator); 2058 { 2059 var it = focus.children.iterator(); 2060 while (it.next()) |e| { 2061 if (e.value_ptr.focus.scroll == null) continue; 2062 try direct.append(allocator, e.key_ptr.*); 2063 try excluded.put(allocator, e.key_ptr.*, {}); 2064 var mit = e.value_ptr.focus.children.iterator(); 2065 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 2066 } 2067 } 2068 2069 // the HTML element a run of cells is wrapped in, chosen from the cell's 2070 // focusable kind 2071 const CellTag = union(enum) { 2072 span, // clickable focusable cell 2073 a: []const u8, // clickable focusable link 2074 plain, // non-focusable, colored 2075 2076 const a_prefix = "a:"; 2077 // an "in-page" anchor: rendered as a real <a href> so it works with js 2078 // disabled, but wasm handles it without navigating. 2079 fn init(str: []const u8) @This() { 2080 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2081 return .{ .a = str[ui.raw_link_prefix.len..] }; 2082 } 2083 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2084 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2085 } 2086 if (std.mem.startsWith(u8, str, a_prefix)) { 2087 return .{ .a = str[a_prefix.len..] }; 2088 } 2089 return .span; 2090 } 2091 2092 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2093 var id_buf: [32]u8 = undefined; 2094 switch (self) { 2095 .span => { 2096 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2097 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2098 try out.appendSlice(alloc, "\""); 2099 try out.appendSlice(alloc, style_attr); 2100 try out.appendSlice(alloc, ">"); 2101 }, 2102 .a => |href| { 2103 // tabindex=-1 keeps these out of the browser's tab order 2104 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2105 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2106 try out.appendSlice(alloc, "\" href=\""); 2107 try appendEscapedHtml(alloc, out, href); 2108 try out.appendSlice(alloc, "\""); 2109 try out.appendSlice(alloc, style_attr); 2110 try out.appendSlice(alloc, ">"); 2111 }, 2112 .plain => { 2113 try out.appendSlice(alloc, "<span"); 2114 try out.appendSlice(alloc, style_attr); 2115 try out.appendSlice(alloc, ">"); 2116 }, 2117 } 2118 } 2119 2120 fn closeTag(self: @This()) []const u8 { 2121 return switch (self) { 2122 .span, .plain => "</span>", 2123 .a => "</a>", 2124 }; 2125 } 2126 }; 2127 2128 // the focusable owning each cell, among this panel's own (skipping any 2129 // that belong to a child scroll, whose cells are drawn in their own panel). 2130 // claimed in focus order, so the first focusable over a cell keeps it. 2131 // looking every focusable up for every cell is quadratic in a long list. 2132 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2133 defer allocator.free(owners); 2134 @memset(owners, null); 2135 { 2136 var it = focus.children.iterator(); 2137 while (it.next()) |entry| { 2138 const child = entry.value_ptr.*; 2139 if (child.focus.mode != .all) continue; 2140 if (excluded.contains(entry.key_ptr.*)) continue; 2141 const r = child.rect; 2142 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2143 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2144 const owner = &owners[y * grid.size.width + x]; 2145 if (owner.* == null) owner.* = entry.key_ptr.*; 2146 } 2147 } 2148 } 2149 } 2150 2151 // the cells are the volatile part of a panel. js replaces this one subtree 2152 // wholesale while retaining the panel's native controls and scroll shells. 2153 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2154 2155 // emit this panel's grid as rows of text, coalescing adjacent cells that 2156 // share a focus id and style into one tag (a clickable span, a link, or a 2157 // plain styled span). cells under a child scroll keep only their background. 2158 // a cell's own link is an anchor nested in that tag. 2159 for (0..grid.size.height) |y| { 2160 var cur_id: ?usize = null; 2161 var cur_style: Grid.Style = .{}; 2162 var open_tag: ?CellTag = null; 2163 var open_link: ?[]const u8 = null; 2164 var first = true; 2165 for (0..grid.size.width) |x| { 2166 const cell = (try grid.cell(x, y)).*; 2167 // a cell covered by a child scroll's viewport is drawn by that scroll's 2168 // own div, so blank its glyph and make it non-clickable here — but keep 2169 // its background, so the backdrop still shows through the scroll's 2170 // transparent div instead of a bare hole. 2171 const covered_by_scroll = blk: { 2172 for (direct.items) |id| { 2173 const r = (focus.children.get(id) orelse continue).rect; 2174 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; 2175 } 2176 break :blk false; 2177 }; 2178 // the focusable owning the cell at (x, y); none for a covered cell. 2179 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2180 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2181 2182 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2183 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2184 open_link = null; 2185 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2186 2187 var new_tag: ?CellTag = null; 2188 if (cell_id) |id| { 2189 if (focus.children.get(id)) |child| { 2190 new_tag = switch (child.focus.kind) { 2191 .custom => |custom| CellTag.init(custom), 2192 else => .span, 2193 }; 2194 } 2195 } 2196 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2197 2198 if (new_tag) |t| { 2199 var style_buf: [192]u8 = undefined; 2200 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2201 } 2202 2203 open_tag = new_tag; 2204 cur_id = cell_id; 2205 cur_style = style; 2206 first = false; 2207 } 2208 2209 // an anchor can't nest in another, so a link tag's cells skip theirs 2210 const in_anchor = if (open_tag) |t| t == .a else false; 2211 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2212 if (!sameLink(link, open_link)) { 2213 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2214 if (link) |url| { 2215 try output.appendSlice(allocator, "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2216 try appendEscapedHtml(allocator, output, url); 2217 try output.appendSlice(allocator, "\">"); 2218 } 2219 open_link = link; 2220 } 2221 2222 if (covered_by_scroll) { 2223 try appendEscapedHtml(allocator, output, " "); 2224 } else if (cell.continuation) { 2225 // the wide rune to the left was emitted 2ch wide, covering this column 2226 } else if (cell.rune) |rune| { 2227 var encoded: [4]u8 = undefined; 2228 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2229 const rune_text = encoded[0..encoded_len]; 2230 // a double-width rune is pinned inside a 2ch span so the 2231 // fallback glyph's advance width can't shift the rest of the row 2232 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2233 if (wide) { 2234 try output.appendSlice(allocator, "<span class=\"w2\">"); 2235 try appendEscapedHtml(allocator, output, rune_text); 2236 try output.appendSlice(allocator, "</span>"); 2237 } else { 2238 try appendEscapedHtml(allocator, output, rune_text); 2239 } 2240 } else { 2241 try appendEscapedHtml(allocator, output, " "); 2242 } 2243 } 2244 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2245 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2246 try output.append(allocator, '\n'); 2247 } 2248 try output.appendSlice(allocator, "</div>"); 2249 2250 // native controls live in their panel, beside the replaceable cells. their 2251 // stable keys let JS update layout without recreating their DOM nodes, and 2252 // being actual descendants of a scroll gives them native movement/clipping. 2253 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2254 2255 // each child scroll becomes a natively-scrollable div positioned over its 2256 // viewport, holding its full content rendered recursively. 2257 for (direct.items) |id| { 2258 const child = focus.children.get(id) orelse continue; 2259 const info = child.focus.scroll orelse continue; 2260 const r = child.rect; 2261 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2262 // when that axis actually overflows. the other axis is clipped (hidden), 2263 // matching how the terminal Scroll handles its non-scrolling axis. 2264 const overflow = switch (info.direction) { 2265 .vert => "overflow-x:hidden;overflow-y:auto", 2266 .horiz => "overflow-x:auto;overflow-y:hidden", 2267 .both => "overflow:auto", 2268 }; 2269 // the id carries a content version so JS preserves the native scroll 2270 // position across re-renders of the same content but resets it when the 2271 // content is replaced — e.g. selecting a different commit. the widget's 2272 // scroll offset (in cells) rides along so JS can apply it when it has no 2273 // preserved position, letting a wasm-side scrollToRect (the files list 2274 // scrolling to its selected row on page load) reach the browser. 2275 var buf: [256]u8 = undefined; 2276 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 })); 2277 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2278 try output.appendSlice(allocator, "</div>"); 2279 } 2280 } 2281 2282 const form_prefix = "form:"; 2283 const form_id_prefix = "haxy-form-"; 2284 2285 fn formAction(focus: *const Focus) ?[]const u8 { 2286 return switch (focus.kind) { 2287 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2288 else => null, 2289 }; 2290 } 2291 2292 // find the form ancestor of a flattened focus-tree child. html's `form` 2293 // attribute then associates the control with that form without requiring the 2294 // form and control to share a DOM parent. 2295 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2296 var id = focus_id; 2297 while (root_focus.children.get(id)) |child| { 2298 const parent_id = child.parent_id; 2299 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2300 const parent = root_focus.children.get(parent_id) orelse return null; 2301 if (formAction(parent.focus) != null) return parent_id; 2302 id = parent_id; 2303 } 2304 return null; 2305 } 2306 2307 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2308 const form_id = formOwner(root_focus, focus_id) orelse return; 2309 var buf: [64]u8 = undefined; 2310 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2311 } 2312 2313 fn renderPanelControls( 2314 allocator: std.mem.Allocator, 2315 output: *std.ArrayList(u8), 2316 focus: *Focus, 2317 session: *ui.Session, 2318 root_focus: *Focus, 2319 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2320 ) !void { 2321 var iter = focus.children.iterator(); 2322 while (iter.next()) |entry| { 2323 const id = entry.key_ptr.*; 2324 if (excluded.contains(id)) continue; 2325 const child = entry.value_ptr.*; 2326 const r = child.rect; 2327 2328 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2329 2330 switch (child.focus.kind) { 2331 .text_input, .text_input_password, .text_area => { 2332 const ti = session.text_inputs.get(id) orelse continue; 2333 2334 const inner_left = r.x + 1; 2335 const inner_top = r.y + 1; 2336 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2337 const preserve = !ti.options.read_only; 2338 2339 if (child.focus.kind == .text_area) { 2340 const value = try ti.text(allocator); 2341 defer allocator.free(value); 2342 var id_buf: [128]u8 = undefined; 2343 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2344 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2345 try appendFormAttribute(allocator, output, root_focus, id); 2346 if (ti.options.name.len > 0) { 2347 try output.appendSlice(allocator, " name=\""); 2348 try appendEscapedHtml(allocator, output, ti.options.name); 2349 try output.append(allocator, '"'); 2350 } 2351 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2352 var pos_buf: [128]u8 = undefined; 2353 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 })); 2354 try appendEscapedHtml(allocator, output, value); 2355 try output.appendSlice(allocator, "</textarea>"); 2356 continue; 2357 } 2358 2359 var id_buf: [160]u8 = undefined; 2360 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 })); 2361 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2362 try appendFormAttribute(allocator, output, root_focus, id); 2363 if (ti.options.name.len > 0) { 2364 try output.appendSlice(allocator, " name=\""); 2365 try appendEscapedHtml(allocator, output, ti.options.name); 2366 try output.append(allocator, '"'); 2367 } 2368 if (child.focus.kind != .text_input_password) { 2369 const value = try ti.text(allocator); 2370 defer allocator.free(value); 2371 try output.appendSlice(allocator, " value=\""); 2372 try appendEscapedHtml(allocator, output, value); 2373 try output.append(allocator, '"'); 2374 } 2375 var pos_buf: [96]u8 = undefined; 2376 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 })); 2377 }, 2378 .custom => |custom| { 2379 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2380 if (formOwner(root_focus, id) == null) continue; 2381 var id_buf: [128]u8 = undefined; 2382 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2383 try appendFormAttribute(allocator, output, root_focus, id); 2384 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2385 try output.appendSlice(allocator, " formaction=\""); 2386 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2387 try output.append(allocator, '"'); 2388 } 2389 var pos_buf: [128]u8 = undefined; 2390 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 })); 2391 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2392 // an invisible native radio over the option, checked when the option is its row's selection 2393 const field = custom[ui.radio_prefix.len..]; 2394 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2395 const row = root_focus.children.get(child.parent_id) orelse continue; 2396 var id_buf: [128]u8 = undefined; 2397 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2398 try appendFormAttribute(allocator, output, root_focus, id); 2399 try output.appendSlice(allocator, " name=\""); 2400 try appendEscapedHtml(allocator, output, field[0..separator]); 2401 try output.appendSlice(allocator, "\" value=\""); 2402 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2403 try output.append(allocator, '"'); 2404 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2405 var pos_buf: [128]u8 = undefined; 2406 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 })); 2407 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2408 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2409 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2410 var id_buf: [128]u8 = undefined; 2411 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 })); 2412 } 2413 }, 2414 else => {}, 2415 } 2416 } 2417 } 2418 2419 // emit hidden form owners beside the rendered panels. their controls point 2420 // back here with the standard HTML `form` attribute. 2421 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2422 // the focus child map preserves insertion order, which matches the order 2423 // widgets were added in code 2424 var iter = root_focus.children.iterator(); 2425 while (iter.next()) |entry| { 2426 const child = entry.value_ptr.*; 2427 const action_url = formAction(child.focus) orelse continue; 2428 2429 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2430 var id_buf: [96]u8 = undefined; 2431 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2432 try appendEscapedHtml(allocator, output, action_url); 2433 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2434 } 2435 } 2436 2437 // the 16 ansi colors as the browser shows them (xterm's defaults) 2438 const ansi_palette = [16]Grid.Color.Rgb{ 2439 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2440 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2441 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2442 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2443 }; 2444 2445 // resolve any color to rgb: palette colors through the ansi table and the 2446 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2447 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2448 return switch (color) { 2449 .rgb => |c| c, 2450 .ansi => |a| ansi_palette[@backingInt(a)], 2451 .indexed => |n| if (n < 16) 2452 ansi_palette[n] 2453 else if (n < 232) blk: { 2454 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2455 const i = n - 16; 2456 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2457 } else blk: { 2458 const v: u8 = 8 + (n - 232) * 10; 2459 break :blk .{ .r = v, .g = v, .b = v }; 2460 }, 2461 }; 2462 } 2463 2464 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2465 // cell's style into `buf`, omitting whichever color is unset. an inverted 2466 // cell swaps the two, falling back to the page's --fg/--bg variables for 2467 // whichever side is unset. text attributes follow the colors. returns an 2468 // empty slice when nothing is set. 2469 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2470 if (style.eql(.{})) return buf[0..0]; 2471 const prefix = " style=\""; 2472 @memcpy(buf[0..prefix.len], prefix); 2473 var i: usize = prefix.len; 2474 const inverted = style.inverted; 2475 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2476 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2477 const decoration: []const u8 = if (style.underline and style.strikethrough) 2478 "text-decoration:underline line-through;" 2479 else if (style.underline) 2480 "text-decoration:underline;" 2481 else if (style.strikethrough) 2482 "text-decoration:line-through;" 2483 else 2484 ""; 2485 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2486 if (style.bold) "font-weight:bold;" else "", 2487 if (style.italic) "font-style:italic;" else "", 2488 decoration, 2489 if (style.dim) "opacity:.6;" else "", 2490 }) catch return buf[0..0]; 2491 i += attributes.len; 2492 if (i >= buf.len) return buf[0..0]; 2493 buf[i] = '"'; 2494 return buf[0 .. i + 1]; 2495 } 2496 2497 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2498 // the color is unset (nothing when both are). returns the new end, or null 2499 // when it doesn't fit. 2500 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2501 const s = if (color) |c| blk: { 2502 const v = colorRgb(c); 2503 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; 2504 } else if (fallback) |f| 2505 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2506 else 2507 return i; 2508 return i + s.len; 2509 } 2510 2511 // a cell's link as an href, when it's a web or mail url 2512 fn webLink(link: ?[]const u8) ?[]const u8 { 2513 const url = link orelse return null; 2514 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2515 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2516 } 2517 return null; 2518 } 2519 2520 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2521 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2522 return b == null; 2523 } 2524 2525 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2526 for (input) |ch| { 2527 switch (ch) { 2528 '&' => try out.appendSlice(allocator, "&amp;"), 2529 '<' => try out.appendSlice(allocator, "&lt;"), 2530 '>' => try out.appendSlice(allocator, "&gt;"), 2531 '"' => try out.appendSlice(allocator, "&quot;"), 2532 '\'' => try out.appendSlice(allocator, "&#39;"), 2533 else => try out.append(allocator, ch), 2534 } 2535 } 2536 } 2537 2538 // --- helpers -------------------------------------------------------------- 2539 2540 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2541 var iter = request.iterateHeaders(); 2542 while (iter.next()) |header| { 2543 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2544 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2545 while (pairs.next()) |pair| { 2546 const trimmed = std.mem.trim(u8, pair, " \t"); 2547 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2548 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2549 return trimmed[eq + 1 ..]; 2550 } 2551 } 2552 } 2553 return null; 2554 } 2555 2556 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2557 var iter = std.mem.splitScalar(u8, body, '&'); 2558 while (iter.next()) |pair| { 2559 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2560 if (std.mem.eql(u8, pair[0..eq], key)) { 2561 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2562 } 2563 } 2564 return null; 2565 } 2566 2567 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2568 var buffer: [256]u8 = undefined; 2569 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2570 } 2571 2572 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2573 var out: std.ArrayList(u8) = .empty; 2574 errdefer out.deinit(allocator); 2575 var i: usize = 0; 2576 while (i < encoded.len) : (i += 1) { 2577 switch (encoded[i]) { 2578 '+' => try out.append(allocator, ' '), 2579 '%' => { 2580 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2581 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2582 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2583 try out.append(allocator, hi * 16 + lo); 2584 i += 2; 2585 }, 2586 else => try out.append(allocator, encoded[i]), 2587 } 2588 } 2589 return try out.toOwnedSlice(allocator); 2590 } 2591 2592 // disk-backed web session store. each login mints a random, opaque token 2593 // (not the user's id) that is stored as a file named by the token hex, whose 2594 // contents are the raw user_id bytes. authenticating a request is a lookup of 2595 // the cookie's token; logout deletes the file, revoking the session. there is 2596 // deliberately no expiry — a session lives until logout. form failures use 2597 // files in the flash subdirectory that the redirected GET consumes. the 2598 // directory is cleared whenever the server starts. 2599 pub const SessionStore = struct { 2600 io: std.Io, 2601 dir: std.Io.Dir, 2602 flash_dir: std.Io.Dir, 2603 auto_login: ?[token_hex_len]u8, 2604 2605 pub const token_hex_len = evt.event_id_size * 2; 2606 2607 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2608 try data_dir.createDirPath(io, "sessions"); 2609 const dir = try data_dir.openDir(io, "sessions", .{}); 2610 errdefer dir.close(io); 2611 try dir.deleteTree(io, "flash"); 2612 try dir.createDirPath(io, "flash"); 2613 const flash_dir = try dir.openDir(io, "flash", .{}); 2614 errdefer flash_dir.close(io); 2615 const auto_login = blk: { 2616 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2617 defer file.close(io); 2618 var token: [token_hex_len]u8 = undefined; 2619 var storage: [token_hex_len]u8 = undefined; 2620 var reader = file.reader(io, &storage); 2621 reader.interface.readSliceAll(&token) catch break :blk null; 2622 break :blk token; 2623 }; 2624 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2625 } 2626 2627 pub fn deinit(self: SessionStore) void { 2628 self.flash_dir.close(self.io); 2629 self.dir.close(self.io); 2630 } 2631 2632 // mint a new session for user_id, returning the token hex to set as the 2633 // cookie value. 2634 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2635 var token: [evt.event_id_size]u8 = undefined; 2636 self.io.random(&token); 2637 const token_hex = std.fmt.bytesToHex(token, .lower); 2638 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2639 defer file.close(self.io); 2640 try file.writeStreamingAll(self.io, user_id); 2641 return token_hex; 2642 } 2643 2644 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2645 var token: [evt.event_id_size]u8 = undefined; 2646 self.io.random(&token); 2647 const token_hex = std.fmt.bytesToHex(token, .lower); 2648 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2649 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2650 defer file.close(self.io); 2651 2652 var json: std.Io.Writer.Allocating = .init(allocator); 2653 defer json.deinit(); 2654 try std.json.Stringify.value(value, .{}, &json.writer); 2655 try file.writeStreamingAll(self.io, json.written()); 2656 return token_hex; 2657 } 2658 2659 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2660 if (!isToken(token_hex)) return null; 2661 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2662 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2663 defer file.close(self.io); 2664 2665 var storage: [4096]u8 = undefined; 2666 var reader = file.reader(self.io, &storage); 2667 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2668 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2669 } 2670 2671 // resolve a cookie's token to its user_id. returns false (logged out) for a 2672 // missing, malformed, or unknown token. 2673 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2674 if (!isToken(token_hex)) return false; 2675 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2676 defer file.close(self.io); 2677 var storage: [evt.event_id_size]u8 = undefined; 2678 var file_reader = file.reader(self.io, &storage); 2679 file_reader.interface.readSliceAll(out) catch return false; 2680 return true; 2681 } 2682 2683 // revoke a session. a no-op for a missing or malformed token. 2684 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2685 if (!isToken(token_hex)) return; 2686 self.dir.deleteFile(self.io, token_hex) catch {}; 2687 } 2688 2689 // leave `token_hex`'s session for visitors arriving without one. only the 2690 // `try` fixture writes one. the name can't collide with a session token. 2691 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2692 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2693 defer file.close(self.io); 2694 try file.writeStreamingAll(self.io, token_hex); 2695 } 2696 2697 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2698 out.* = self.auto_login orelse return false; 2699 return true; 2700 } 2701 2702 const auto_login_name = "auto-login"; 2703 2704 // a token is exactly token_hex_len hex chars. validating before using the 2705 // value as a path keeps attacker-supplied cookies from escaping the 2706 // sessions dir (e.g. via "/" or ".." bytes). 2707 fn isToken(token_hex: []const u8) bool { 2708 if (token_hex.len != token_hex_len) return false; 2709 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2710 return true; 2711 } 2712 }; 2713