╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭7fcb7c5a..╮ 7fcb7c5a.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (647) 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 │ ╰─────────────────────────────────╯
1813 }); 1814 return; 1815 }; 1816 const theirs: []const u8 = switch (route) { 1817 .repo_patches => |*patch| patch.theirs.slice(), 1818 .repo_issues => "", 1819 else => unreachable, 1820 }; 1821 const not_found = if (parts.thread_kind == .patch) "patch not found" else "issue not found"; 1822 1823 (switch (parts.thread_kind) { 1824 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1825 .title = title, 1826 .labels = labels, 1827 .hunks = hunks.items, 1828 } }, author), 1829 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1830 .title = title, 1831 .labels = labels, 1832 .hunks = hunks.items, 1833 .theirs = theirs, 1834 } }, author), 1835 else => unreachable, 1836 }) catch |err| switch (err) { 1837 error.NotFound => { 1838 try request.respond(not_found, .{ 1839 .status = .not_found, 1840 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1841 }); 1842 return; 1843 }, 1844 // invalid fields send the user back to the resolve form 1845 error.InvalidFields => { 1846 const form_location = try allocator.print("{s}/resolve", .{base}); 1847 defer allocator.free(form_location); 1848 try request.respond("", .{ 1849 .status = .see_other, 1850 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1851 }); 1852 return; 1853 }, 1854 else => |e| return e, 1855 }; 1856 1857 try request.respond("", .{ 1858 .status = .see_other, 1859 .extra_headers = &.{.{ .name = "location", .value = base }}, 1860 }); 1861 } 1862 1863 // the posted path drops the action's own segment, so the route it parses is 1864 // the undo page the action applies to, never the confirmation page itself 1865 fn handleUndo(io: std.Io, request: *std.http.Server.Request, allocator: std.mem.Allocator, base: []const u8, host: Host, action: enum { undo, clear }) !void { 1866 const route = routeFromUrl(host, base) orelse return respondRepoNotFound(request); 1867 if (route != .repo_undo) return respondRepoNotFound(request); 1868 const target = route.repo_undo; 1869 var arena = std.heap.ArenaAllocator.init(allocator); 1870 defer arena.deinit(); 1871 const repo_base = if (target.name.len == 0) "" else try arena.allocator().print("/{s}", .{target.name.slice()}); 1872 _ = (try authorizeWrite(io, allocator, &arena, request, host, repo_base, .owner, null)) orelse return; 1873 const resolved = (try requestRepoSource(io, allocator, host, repo_base)) orelse return respondRepoNotFound(request); 1874 defer resolved.deinit(allocator); 1875 (switch (action) { 1876 .undo => ui.Repo.Undo.execute(io, allocator, resolved.source, target.index orelse return respondRepoNotFound(request)), 1877 .clear => ui.Repo.Undo.clearHistory(io, allocator, resolved.source), 1878 }) catch |err| switch (err) { 1879 error.NotFound, error.InvalidHistoryIndex, error.TransactionNotFound => return respondRepoNotFound(request), 1880 else => return err, 1881 }; 1882 const location = try (ui.RoutablePage.repoUndoRoute(target.name.slice(), null) orelse return error.RouteTooLong).toUrl(&arena); 1883 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = location }} }); 1884 } 1885 1886 fn handleSync( 1887 io: std.Io, 1888 request: *std.http.Server.Request, 1889 allocator: std.mem.Allocator, 1890 base: []const u8, 1891 source: ui.RepoSource, 1892 ) !void { 1893 if (base.len != 0) { 1894 try request.respond("not found", .{ 1895 .status = .not_found, 1896 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1897 }); 1898 return; 1899 } 1900 1901 var owned_failure: ?[]u8 = null; 1902 defer if (owned_failure) |message| allocator.free(message); 1903 const failure: ?[]const u8 = blk: { 1904 owned_failure = ui.Repo.Events.sync(io, allocator, source) catch |err| break :blk @errorName(err); 1905 break :blk owned_failure; 1906 }; 1907 if (failure) |message| { 1908 var encoded: std.Io.Writer.Allocating = .init(allocator); 1909 defer encoded.deinit(); 1910 try std.Uri.Component.percentEncode(&encoded.writer, message, struct { 1911 fn isUnreserved(c: u8) bool { 1912 return std.ascii.isAlphanumeric(c) or c == '-' or c == '.' or c == '_' or c == '~'; 1913 } 1914 }.isUnreserved); 1915 const cookie = try allocator.print( 1916 local_flash_cookie ++ "=" ++ local_sync_failure_prefix ++ "{s}; Path=/; HttpOnly; SameSite=Strict", 1917 .{encoded.written()}, 1918 ); 1919 defer allocator.free(cookie); 1920 try request.respond("", .{ 1921 .status = .see_other, 1922 .extra_headers = &.{ 1923 .{ .name = "location", .value = "/events" }, 1924 .{ .name = "set-cookie", .value = cookie }, 1925 }, 1926 }); 1927 return; 1928 } 1929 1930 try request.respond("", .{ 1931 .status = .see_other, 1932 .extra_headers = &.{ 1933 .{ .name = "location", .value = "/events" }, 1934 .{ .name = "set-cookie", .value = local_flash_cookie ++ "=; Path=/; Max-Age=0" }, 1935 }, 1936 }); 1937 } 1938 1939 fn renderIndexHtml( 1940 io: std.Io, 1941 allocator: std.mem.Allocator, 1942 host: Host, 1943 session_token: ?[]const u8, 1944 session_data: ui.Session.Data, 1945 ) ![]const u8 { 1946 const template = (findEmbed("/index.html") orelse return error.MissingIndexAsset).body; 1947 1948 var page_arena = std.heap.ArenaAllocator.init(allocator); 1949 defer page_arena.deinit(); 1950 1951 // the server admin repo must outlive the page build, since the session's 1952 // moment reads from it. 1953 var repo_maybe: ?rp.Repo(.xit, evt.admin_repo_opts) = null; 1954 defer if (repo_maybe) |*repo| repo.deinit(io, allocator); 1955 1956 var session = switch (host) { 1957 .server => |server| blk: { 1958 // open the admin repo to read live user/repo data. 1959 repo_maybe = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1960 const repo = if (repo_maybe) |*repo| repo else unreachable; 1961 var session = try ui.Session.init(&page_arena, repo, session_data); 1962 // the session dropped a user whose account was removed, so revoke 1963 // the token that named them 1964 if (session_token) |token| { 1965 if (session.data.user_id == null) server.session_store.remove(token); 1966 } 1967 // give the page builders filesystem access to the on-disk repos (a 1968 // sibling "users" dir next to the admin repo) so the Repo page can 1969 // read its files. 1970 session.users_dir = server.users_dir; 1971 break :blk session; 1972 }, 1973 .local => |local| ui.Session{ 1974 .data = session_data, 1975 .arena = &page_arena, 1976 .page_arena = &page_arena, 1977 .local = local, 1978 }, 1979 }; 1980 session.io = io; 1981 1982 var page = try ui.Page.init(session.page_arena, &session, session.data.current_page); 1983 var root = try ui.initRoot(allocator, &page, &session); 1984 defer root.deinit(allocator); 1985 1986 const snapshot: ui.Snapshot = .{ .page = page, .session = session.data }; 1987 1988 const content = try generateHtml(allocator, &root, &session); 1989 defer allocator.free(content); 1990 1991 // serialize the snapshot so the wasm side can parse it back without making 1992 // a second request. it's embedded raw in a <script type="application/json"> 1993 // block, whose content is raw text terminated only by "</script". in json, 1994 // '<' appears solely inside string values, so escaping every '<' (and '>' 1995 // for good measure) to its \uXXXX form yields equivalent json that can't 1996 // break out of the tag. 1997 var json: std.Io.Writer.Allocating = .init(allocator); 1998 defer json.deinit(); 1999 try std.json.Stringify.value(snapshot, .{}, &json.writer); 2000 2001 var json_escaped: std.ArrayList(u8) = .empty; 2002 defer json_escaped.deinit(allocator); 2003 for (json.written()) |c| switch (c) { 2004 '<' => try json_escaped.appendSlice(allocator, "\\u003c"), 2005 '>' => try json_escaped.appendSlice(allocator, "\\u003e"), 2006 else => try json_escaped.append(allocator, c), 2007 }; 2008 2009 var out: std.ArrayList(u8) = .empty; 2010 errdefer out.deinit(allocator); 2011 { 2012 var cursor: usize = 0; 2013 for (&[_]struct { needle: []const u8, replacement: []const u8 }{ 2014 .{ .needle = "{{{ HAXY_HTML }}}", .replacement = content }, 2015 .{ .needle = "{{{ HAXY_JSON }}}", .replacement = json_escaped.items }, 2016 }) |sub| { 2017 const idx = std.mem.indexOfPos(u8, template, cursor, sub.needle) orelse return error.MissingTemplateToken; 2018 try out.appendSlice(allocator, template[cursor..idx]); 2019 try out.appendSlice(allocator, sub.replacement); 2020 cursor = idx + sub.needle.len; 2021 } 2022 try out.appendSlice(allocator, template[cursor..]); 2023 } 2024 return try out.toOwnedSlice(allocator); 2025 } 2026 2027 fn findEmbed(request_path: []const u8) ?Embed { 2028 // embeds are matched before pages, so a dot keeps them from claiming a username or tab 2029 comptime for (embeds) |embed| { 2030 if (std.mem.indexOfScalar(u8, embed.path, '.') == null) @compileError("embed path needs a '.' so it can't shadow a page: " ++ embed.path); 2031 }; 2032 if (request_path.len < 2 or request_path[0] != '/') return null; 2033 const path = request_path[1..]; 2034 2035 for (embeds) |embed| { 2036 if (std.mem.eql(u8, path, embed.path)) return embed; 2037 } 2038 return null; 2039 } 2040 2041 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 2042 // own absolutely-positioned, natively-scrollable <div> holding its full content, 2043 // rendered recursively so nested scrolls work. 2044 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 2045 const grid = root.getGrid() orelse return error.MissingGrid; 2046 const root_focus = root.getFocus(); 2047 2048 var out: std.ArrayList(u8) = .empty; 2049 errdefer out.deinit(allocator); 2050 2051 switch (root.*) { 2052 .background => |*background| { 2053 if (background.art.getGrid()) |art| { 2054 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 }); 2055 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 2056 try out.appendSlice(allocator, "</div>"); 2057 } 2058 }, 2059 else => {}, 2060 } 2061 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 2062 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 2063 try out.appendSlice(allocator, "</div>"); 2064 try renderForms(allocator, &out, root_focus); 2065 return try out.toOwnedSlice(allocator); 2066 } 2067 2068 // render one panel — a focus subtree and its content grid — as HTML, recursing 2069 // once per web-native Scroll inside it. the root panel is the whole page; each 2070 // Scroll becomes a nested, natively-scrollable div holding its full content. 2071 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 2072 // then the child scroll divs over those holes. 2073 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 2074 // `direct` is this panel's scroll children, each drawn as an overlaid div. 2075 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 2076 // plus their descendants, which the focus tree flattens into this panel's 2077 // children): the cell hit-test below skips them so this panel doesn't claim 2078 // cells that are really rendered inside a child scroll's own panel. 2079 // (scrolls aren't nested in practice, so every scroll child is direct here.) 2080 var direct: std.ArrayList(usize) = .empty; 2081 defer direct.deinit(allocator); 2082 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 2083 defer excluded.deinit(allocator); 2084 { 2085 var it = focus.children.iterator(); 2086 while (it.next()) |e| { 2087 if (e.value_ptr.focus.scroll == null) continue; 2088 try direct.append(allocator, e.key_ptr.*); 2089 try excluded.put(allocator, e.key_ptr.*, {}); 2090 var mit = e.value_ptr.focus.children.iterator(); 2091 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 2092 } 2093 } 2094 2095 // the HTML element a run of cells is wrapped in, chosen from the cell's 2096 // focusable kind 2097 const CellTag = union(enum) { 2098 span, // clickable focusable cell 2099 a: []const u8, // clickable focusable link 2100 plain, // non-focusable, colored 2101 2102 const a_prefix = "a:"; 2103 // an "in-page" anchor: rendered as a real <a href> so it works with js 2104 // disabled, but wasm handles it without navigating. 2105 fn init(str: []const u8) @This() { 2106 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2107 return .{ .a = str[ui.raw_link_prefix.len..] }; 2108 } 2109 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2110 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2111 } 2112 if (std.mem.startsWith(u8, str, a_prefix)) { 2113 return .{ .a = str[a_prefix.len..] }; 2114 } 2115 return .span; 2116 } 2117 2118 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2119 var id_buf: [32]u8 = undefined; 2120 switch (self) { 2121 .span => { 2122 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2123 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2124 try out.appendSlice(alloc, "\""); 2125 try out.appendSlice(alloc, style_attr); 2126 try out.appendSlice(alloc, ">"); 2127 }, 2128 .a => |href| { 2129 // tabindex=-1 keeps these out of the browser's tab order 2130 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2131 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2132 try out.appendSlice(alloc, "\" href=\""); 2133 try appendEscapedHtml(alloc, out, href); 2134 try out.appendSlice(alloc, "\""); 2135 try out.appendSlice(alloc, style_attr); 2136 try out.appendSlice(alloc, ">"); 2137 }, 2138 .plain => { 2139 try out.appendSlice(alloc, "<span"); 2140 try out.appendSlice(alloc, style_attr); 2141 try out.appendSlice(alloc, ">"); 2142 }, 2143 } 2144 } 2145 2146 fn closeTag(self: @This()) []const u8 { 2147 return switch (self) { 2148 .span, .plain => "</span>", 2149 .a => "</a>", 2150 }; 2151 } 2152 }; 2153 2154 // the focusable owning each cell, among this panel's own (skipping any 2155 // that belong to a child scroll, whose cells are drawn in their own panel). 2156 // claimed in focus order, so the first focusable over a cell keeps it. 2157 // looking every focusable up for every cell is quadratic in a long list. 2158 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2159 defer allocator.free(owners); 2160 @memset(owners, null); 2161 { 2162 var it = focus.children.iterator(); 2163 while (it.next()) |entry| { 2164 const child = entry.value_ptr.*; 2165 if (child.focus.mode != .all) continue; 2166 if (excluded.contains(entry.key_ptr.*)) continue; 2167 const r = child.rect; 2168 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2169 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2170 const owner = &owners[y * grid.size.width + x]; 2171 if (owner.* == null) owner.* = entry.key_ptr.*; 2172 } 2173 } 2174 } 2175 } 2176 2177 // the cells are the volatile part of a panel. js replaces this one subtree 2178 // wholesale while retaining the panel's native controls and scroll shells. 2179 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2180 2181 // emit this panel's grid as rows of text, coalescing adjacent cells that 2182 // share a focus id and style into one tag (a clickable span, a link, or a 2183 // plain styled span). cells under a child scroll keep only their background. 2184 // a cell's own link is an anchor nested in that tag. 2185 for (0..grid.size.height) |y| { 2186 var cur_id: ?usize = null; 2187 var cur_style: Grid.Style = .{}; 2188 var open_tag: ?CellTag = null; 2189 var open_link: ?[]const u8 = null; 2190 var first = true; 2191 for (0..grid.size.width) |x| { 2192 const cell = (try grid.cell(x, y)).*; 2193 // a cell covered by a child scroll's viewport is drawn by that scroll's 2194 // own div, so blank its glyph and make it non-clickable here — but keep 2195 // its background, so the backdrop still shows through the scroll's 2196 // transparent div instead of a bare hole. 2197 const covered_by_scroll = blk: { 2198 for (direct.items) |id| { 2199 const r = (focus.children.get(id) orelse continue).rect; 2200 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; 2201 } 2202 break :blk false; 2203 }; 2204 // the focusable owning the cell at (x, y); none for a covered cell. 2205 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2206 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2207 2208 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2209 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2210 open_link = null; 2211 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2212 2213 var new_tag: ?CellTag = null; 2214 if (cell_id) |id| { 2215 if (focus.children.get(id)) |child| { 2216 new_tag = switch (child.focus.kind) { 2217 .custom => |custom| CellTag.init(custom), 2218 else => .span, 2219 }; 2220 } 2221 } 2222 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2223 2224 if (new_tag) |t| { 2225 var style_buf: [192]u8 = undefined; 2226 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2227 } 2228 2229 open_tag = new_tag; 2230 cur_id = cell_id; 2231 cur_style = style; 2232 first = false; 2233 } 2234 2235 // an anchor can't nest in another, so a link tag's cells skip theirs 2236 const in_anchor = if (open_tag) |t| t == .a else false; 2237 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2238 if (!sameLink(link, open_link)) { 2239 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2240 if (link) |url| { 2241 // a page path opens in this tab, any other url in a new one 2242 try output.appendSlice(allocator, if (url[0] == '/') 2243 "<a class=\"cell-link\" tabindex=\"-1\" href=\"" 2244 else 2245 "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2246 try appendEscapedHtml(allocator, output, url); 2247 try output.appendSlice(allocator, "\">"); 2248 } 2249 open_link = link; 2250 } 2251 2252 if (covered_by_scroll) { 2253 try appendEscapedHtml(allocator, output, " "); 2254 } else if (cell.continuation) { 2255 // the wide rune to the left was emitted 2ch wide, covering this column 2256 } else if (cell.rune) |rune| { 2257 var encoded: [4]u8 = undefined; 2258 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2259 const rune_text = encoded[0..encoded_len]; 2260 // a double-width rune is pinned inside a 2ch span so the 2261 // fallback glyph's advance width can't shift the rest of the row 2262 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2263 if (wide) { 2264 try output.appendSlice(allocator, "<span class=\"w2\">"); 2265 try appendEscapedHtml(allocator, output, rune_text); 2266 try output.appendSlice(allocator, "</span>"); 2267 } else { 2268 try appendEscapedHtml(allocator, output, rune_text); 2269 } 2270 } else { 2271 try appendEscapedHtml(allocator, output, " "); 2272 } 2273 } 2274 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2275 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2276 try output.append(allocator, '\n'); 2277 } 2278 try output.appendSlice(allocator, "</div>"); 2279 2280 // native controls live in their panel, beside the replaceable cells. their 2281 // stable keys let JS update layout without recreating their DOM nodes, and 2282 // being actual descendants of a scroll gives them native movement/clipping. 2283 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2284 2285 // each child scroll becomes a natively-scrollable div positioned over its 2286 // viewport, holding its full content rendered recursively. 2287 for (direct.items) |id| { 2288 const child = focus.children.get(id) orelse continue; 2289 const info = child.focus.scroll orelse continue; 2290 const r = child.rect; 2291 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2292 // when that axis actually overflows. the other axis is clipped (hidden), 2293 // matching how the terminal Scroll handles its non-scrolling axis. 2294 const overflow = switch (info.direction) { 2295 .vert => "overflow-x:hidden;overflow-y:auto", 2296 .horiz => "overflow-x:auto;overflow-y:hidden", 2297 .both => "overflow:auto", 2298 }; 2299 // the id carries a content version so JS preserves the native scroll 2300 // position across re-renders of the same content but resets it when the 2301 // content is replaced — e.g. selecting a different commit. the widget's 2302 // scroll offset (in cells) rides along so JS can apply it when it has no 2303 // preserved position, letting a wasm-side scrollToRect (the files list 2304 // scrolling to its selected row on page load) reach the browser. 2305 var buf: [256]u8 = undefined; 2306 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 })); 2307 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2308 try output.appendSlice(allocator, "</div>"); 2309 } 2310 } 2311 2312 const form_prefix = "form:"; 2313 const form_id_prefix = "haxy-form-"; 2314 2315 fn formAction(focus: *const Focus) ?[]const u8 { 2316 return switch (focus.kind) { 2317 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2318 else => null, 2319 }; 2320 } 2321 2322 // find the form ancestor of a flattened focus-tree child. html's `form` 2323 // attribute then associates the control with that form without requiring the 2324 // form and control to share a DOM parent. 2325 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2326 var id = focus_id; 2327 while (root_focus.children.get(id)) |child| { 2328 const parent_id = child.parent_id; 2329 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2330 const parent = root_focus.children.get(parent_id) orelse return null; 2331 if (formAction(parent.focus) != null) return parent_id; 2332 id = parent_id; 2333 } 2334 return null; 2335 } 2336 2337 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2338 const form_id = formOwner(root_focus, focus_id) orelse return; 2339 var buf: [64]u8 = undefined; 2340 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2341 } 2342 2343 fn renderPanelControls( 2344 allocator: std.mem.Allocator, 2345 output: *std.ArrayList(u8), 2346 focus: *Focus, 2347 session: *ui.Session, 2348 root_focus: *Focus, 2349 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2350 ) !void { 2351 var iter = focus.children.iterator(); 2352 while (iter.next()) |entry| { 2353 const id = entry.key_ptr.*; 2354 if (excluded.contains(id)) continue; 2355 const child = entry.value_ptr.*; 2356 const r = child.rect; 2357 2358 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2359 2360 switch (child.focus.kind) { 2361 .text_input, .text_input_password, .text_area => { 2362 const ti = session.text_inputs.get(id) orelse continue; 2363 2364 const inner_left = r.x + 1; 2365 const inner_top = r.y + 1; 2366 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2367 const preserve = !ti.options.read_only; 2368 2369 if (child.focus.kind == .text_area) { 2370 const value = try ti.text(allocator); 2371 defer allocator.free(value); 2372 var id_buf: [128]u8 = undefined; 2373 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2374 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2375 try appendFormAttribute(allocator, output, root_focus, id); 2376 if (ti.options.name.len > 0) { 2377 try output.appendSlice(allocator, " name=\""); 2378 try appendEscapedHtml(allocator, output, ti.options.name); 2379 try output.append(allocator, '"'); 2380 } 2381 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2382 var pos_buf: [128]u8 = undefined; 2383 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 })); 2384 try appendEscapedHtml(allocator, output, value); 2385 try output.appendSlice(allocator, "</textarea>"); 2386 continue; 2387 } 2388 2389 var id_buf: [160]u8 = undefined; 2390 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 })); 2391 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2392 try appendFormAttribute(allocator, output, root_focus, id); 2393 if (ti.options.name.len > 0) { 2394 try output.appendSlice(allocator, " name=\""); 2395 try appendEscapedHtml(allocator, output, ti.options.name); 2396 try output.append(allocator, '"'); 2397 } 2398 if (child.focus.kind != .text_input_password) { 2399 const value = try ti.text(allocator); 2400 defer allocator.free(value); 2401 try output.appendSlice(allocator, " value=\""); 2402 try appendEscapedHtml(allocator, output, value); 2403 try output.append(allocator, '"'); 2404 } 2405 var pos_buf: [96]u8 = undefined; 2406 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 })); 2407 }, 2408 .custom => |custom| { 2409 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2410 if (formOwner(root_focus, id) == null) continue; 2411 var id_buf: [128]u8 = undefined; 2412 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2413 try appendFormAttribute(allocator, output, root_focus, id); 2414 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2415 try output.appendSlice(allocator, " formaction=\""); 2416 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2417 try output.append(allocator, '"'); 2418 } 2419 var pos_buf: [128]u8 = undefined; 2420 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 })); 2421 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2422 // an invisible native radio over the option, checked when the option is its row's selection 2423 const field = custom[ui.radio_prefix.len..]; 2424 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2425 const row = root_focus.children.get(child.parent_id) orelse continue; 2426 var id_buf: [128]u8 = undefined; 2427 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2428 try appendFormAttribute(allocator, output, root_focus, id); 2429 try output.appendSlice(allocator, " name=\""); 2430 try appendEscapedHtml(allocator, output, field[0..separator]); 2431 try output.appendSlice(allocator, "\" value=\""); 2432 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2433 try output.append(allocator, '"'); 2434 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2435 var pos_buf: [128]u8 = undefined; 2436 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 })); 2437 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2438 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2439 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2440 var id_buf: [128]u8 = undefined; 2441 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 })); 2442 } 2443 }, 2444 else => {}, 2445 } 2446 } 2447 } 2448 2449 // emit hidden form owners beside the rendered panels. their controls point 2450 // back here with the standard HTML `form` attribute. 2451 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2452 // the focus child map preserves insertion order, which matches the order 2453 // widgets were added in code 2454 var iter = root_focus.children.iterator(); 2455 while (iter.next()) |entry| { 2456 const child = entry.value_ptr.*; 2457 const action_url = formAction(child.focus) orelse continue; 2458 2459 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2460 var id_buf: [96]u8 = undefined; 2461 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2462 try appendEscapedHtml(allocator, output, action_url); 2463 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2464 } 2465 } 2466 2467 // the 16 ansi colors as the browser shows them (xterm's defaults) 2468 const ansi_palette = [16]Grid.Color.Rgb{ 2469 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2470 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2471 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2472 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2473 }; 2474 2475 // resolve any color to rgb: palette colors through the ansi table and the 2476 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2477 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2478 return switch (color) { 2479 .rgb => |c| c, 2480 .ansi => |a| ansi_palette[@backingInt(a)], 2481 .indexed => |n| if (n < 16) 2482 ansi_palette[n] 2483 else if (n < 232) blk: { 2484 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2485 const i = n - 16; 2486 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2487 } else blk: { 2488 const v: u8 = 8 + (n - 232) * 10; 2489 break :blk .{ .r = v, .g = v, .b = v }; 2490 }, 2491 }; 2492 } 2493 2494 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2495 // cell's style into `buf`, omitting whichever color is unset. an inverted 2496 // cell swaps the two, falling back to the page's --fg/--bg variables for 2497 // whichever side is unset. text attributes follow the colors. returns an 2498 // empty slice when nothing is set. 2499 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2500 if (style.eql(.{})) return buf[0..0]; 2501 const prefix = " style=\""; 2502 @memcpy(buf[0..prefix.len], prefix); 2503 var i: usize = prefix.len; 2504 const inverted = style.inverted; 2505 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2506 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2507 const decoration: []const u8 = if (style.underline and style.strikethrough) 2508 "text-decoration:underline line-through;" 2509 else if (style.underline) 2510 "text-decoration:underline;" 2511 else if (style.strikethrough) 2512 "text-decoration:line-through;" 2513 else 2514 ""; 2515 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2516 if (style.bold) "font-weight:bold;" else "", 2517 if (style.italic) "font-style:italic;" else "", 2518 decoration, 2519 if (style.dim) "opacity:.6;" else "", 2520 }) catch return buf[0..0]; 2521 i += attributes.len; 2522 if (i >= buf.len) return buf[0..0]; 2523 buf[i] = '"'; 2524 return buf[0 .. i + 1]; 2525 } 2526 2527 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2528 // the color is unset (nothing when both are). returns the new end, or null 2529 // when it doesn't fit. 2530 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2531 const s = if (color) |c| blk: { 2532 const v = colorRgb(c); 2533 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; 2534 } else if (fallback) |f| 2535 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2536 else 2537 return i; 2538 return i + s.len; 2539 } 2540 2541 // a cell's link as an href, when it's a page path or a web or mail url 2542 fn webLink(link: ?[]const u8) ?[]const u8 { 2543 const url = link orelse return null; 2544 // a page path, not a protocol-relative url 2545 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2546 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2547 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2548 } 2549 return null; 2550 } 2551 2552 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2553 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2554 return b == null; 2555 } 2556 2557 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2558 for (input) |ch| { 2559 switch (ch) { 2560 '&' => try out.appendSlice(allocator, "&amp;"), 2561 '<' => try out.appendSlice(allocator, "&lt;"), 2562 '>' => try out.appendSlice(allocator, "&gt;"), 2563 '"' => try out.appendSlice(allocator, "&quot;"), 2564 '\'' => try out.appendSlice(allocator, "&#39;"), 2565 else => try out.append(allocator, ch), 2566 } 2567 } 2568 } 2569 2570 // --- helpers -------------------------------------------------------------- 2571 2572 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2573 var iter = request.iterateHeaders(); 2574 while (iter.next()) |header| { 2575 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2576 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2577 while (pairs.next()) |pair| { 2578 const trimmed = std.mem.trim(u8, pair, " \t"); 2579 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2580 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2581 return trimmed[eq + 1 ..]; 2582 } 2583 } 2584 } 2585 return null; 2586 } 2587 2588 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2589 var iter = std.mem.splitScalar(u8, body, '&'); 2590 while (iter.next()) |pair| { 2591 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2592 if (std.mem.eql(u8, pair[0..eq], key)) { 2593 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2594 } 2595 } 2596 return null; 2597 } 2598 2599 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2600 var buffer: [256]u8 = undefined; 2601 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2602 } 2603 2604 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2605 var out: std.ArrayList(u8) = .empty; 2606 errdefer out.deinit(allocator); 2607 var i: usize = 0; 2608 while (i < encoded.len) : (i += 1) { 2609 switch (encoded[i]) { 2610 '+' => try out.append(allocator, ' '), 2611 '%' => { 2612 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2613 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2614 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2615 try out.append(allocator, hi * 16 + lo); 2616 i += 2; 2617 }, 2618 else => try out.append(allocator, encoded[i]), 2619 } 2620 } 2621 return try out.toOwnedSlice(allocator); 2622 } 2623 2624 // disk-backed web session store. each login mints a random, opaque token 2625 // (not the user's id) that is stored as a file named by the token hex, whose 2626 // contents are the raw user_id bytes. authenticating a request is a lookup of 2627 // the cookie's token; logout deletes the file, revoking the session. there is 2628 // deliberately no expiry — a session lives until logout. form failures use 2629 // files in the flash subdirectory that the redirected GET consumes. the 2630 // directory is cleared whenever the server starts. 2631 pub const SessionStore = struct { 2632 io: std.Io, 2633 dir: std.Io.Dir, 2634 flash_dir: std.Io.Dir, 2635 auto_login: ?[token_hex_len]u8, 2636 2637 pub const token_hex_len = evt.event_id_size * 2; 2638 2639 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2640 try data_dir.createDirPath(io, "sessions"); 2641 const dir = try data_dir.openDir(io, "sessions", .{}); 2642 errdefer dir.close(io); 2643 try dir.deleteTree(io, "flash"); 2644 try dir.createDirPath(io, "flash"); 2645 const flash_dir = try dir.openDir(io, "flash", .{}); 2646 errdefer flash_dir.close(io); 2647 const auto_login = blk: { 2648 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2649 defer file.close(io); 2650 var token: [token_hex_len]u8 = undefined; 2651 var storage: [token_hex_len]u8 = undefined; 2652 var reader = file.reader(io, &storage); 2653 reader.interface.readSliceAll(&token) catch break :blk null; 2654 break :blk token; 2655 }; 2656 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2657 } 2658 2659 pub fn deinit(self: SessionStore) void { 2660 self.flash_dir.close(self.io); 2661 self.dir.close(self.io); 2662 } 2663 2664 // mint a new session for user_id, returning the token hex to set as the 2665 // cookie value. 2666 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2667 var token: [evt.event_id_size]u8 = undefined; 2668 self.io.random(&token); 2669 const token_hex = std.fmt.bytesToHex(token, .lower); 2670 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2671 defer file.close(self.io); 2672 try file.writeStreamingAll(self.io, user_id); 2673 return token_hex; 2674 } 2675 2676 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2677 var token: [evt.event_id_size]u8 = undefined; 2678 self.io.random(&token); 2679 const token_hex = std.fmt.bytesToHex(token, .lower); 2680 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2681 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2682 defer file.close(self.io); 2683 2684 var json: std.Io.Writer.Allocating = .init(allocator); 2685 defer json.deinit(); 2686 try std.json.Stringify.value(value, .{}, &json.writer); 2687 try file.writeStreamingAll(self.io, json.written()); 2688 return token_hex; 2689 } 2690 2691 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2692 if (!isToken(token_hex)) return null; 2693 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2694 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2695 defer file.close(self.io); 2696 2697 var storage: [4096]u8 = undefined; 2698 var reader = file.reader(self.io, &storage); 2699 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2700 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2701 } 2702 2703 // resolve a cookie's token to its user_id. returns false (logged out) for a 2704 // missing, malformed, or unknown token. 2705 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2706 if (!isToken(token_hex)) return false; 2707 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2708 defer file.close(self.io); 2709 var storage: [evt.event_id_size]u8 = undefined; 2710 var file_reader = file.reader(self.io, &storage); 2711 file_reader.interface.readSliceAll(out) catch return false; 2712 return true; 2713 } 2714 2715 // revoke a session. a no-op for a missing or malformed token. 2716 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2717 if (!isToken(token_hex)) return; 2718 self.dir.deleteFile(self.io, token_hex) catch {}; 2719 } 2720 2721 // leave `token_hex`'s session for visitors arriving without one. only the 2722 // `try` fixture writes one. the name can't collide with a session token. 2723 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2724 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2725 defer file.close(self.io); 2726 try file.writeStreamingAll(self.io, token_hex); 2727 } 2728 2729 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2730 out.* = self.auto_login orelse return false; 2731 return true; 2732 } 2733 2734 const auto_login_name = "auto-login"; 2735 2736 // a token is exactly token_hex_len hex chars. validating before using the 2737 // value as a path keeps attacker-supplied cookies from escaping the 2738 // sessions dir (e.g. via "/" or ".." bytes). 2739 fn isToken(token_hex: []const u8) bool { 2740 if (token_hex.len != token_hex_len) return false; 2741 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2742 return true; 2743 } 2744 }; 2745