╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭d23217c1..╮ d23217c1.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (650) 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 │ ╰─────────────────────────────────╯
1817 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1818 }); 1819 return; 1820 }; 1821 1822 var author_arena = std.heap.ArenaAllocator.init(allocator); 1823 defer author_arena.deinit(); 1824 const author = ((try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .write, parts.thread_kind)) orelse return).author; 1825 1826 const body = try readFormBody(request, allocator); 1827 defer allocator.free(body); 1828 1829 var field_arena = std.heap.ArenaAllocator.init(allocator); 1830 defer field_arena.deinit(); 1831 const aa = field_arena.allocator(); 1832 const title = try parseFormField(aa, body, "title"); 1833 const labels = try parseFormField(aa, body, "labels"); 1834 1835 // the hunk inputs are submitted as d0, d1, ...; form submission normalizes their 1836 // textarea line breaks to CRLF 1837 var hunks: std.ArrayList([]const u8) = .empty; 1838 var hunk_index: usize = 0; 1839 while (true) : (hunk_index += 1) { 1840 const name = try aa.print("d{d}", .{hunk_index}); 1841 const submitted = (try parseFormField(aa, body, name)) orelse break; 1842 try hunks.append(aa, try std.mem.replaceOwned(u8, aa, submitted, "\r\n", "\n")); 1843 } 1844 1845 if (parts.comment_id != null or (parts.thread_kind != .issue and parts.thread_kind != .patch)) { 1846 try request.respond("thread not found", .{ 1847 .status = .not_found, 1848 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1849 }); 1850 return; 1851 } 1852 const route = routeFromUrl(host, base) orelse { 1853 try request.respond("thread not found", .{ 1854 .status = .not_found, 1855 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1856 }); 1857 return; 1858 }; 1859 const theirs: []const u8 = switch (route) { 1860 .repo_patches => |*patch| patch.theirs.slice(), 1861 .repo_issues => "", 1862 else => unreachable, 1863 }; 1864 const not_found = if (parts.thread_kind == .patch) "patch not found" else "issue not found"; 1865 1866 (switch (parts.thread_kind) { 1867 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1868 .title = title, 1869 .labels = labels, 1870 .hunks = hunks.items, 1871 } }, author), 1872 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1873 .title = title, 1874 .labels = labels, 1875 .hunks = hunks.items, 1876 .theirs = theirs, 1877 } }, author), 1878 else => unreachable, 1879 }) catch |err| switch (err) { 1880 error.NotFound => { 1881 try request.respond(not_found, .{ 1882 .status = .not_found, 1883 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1884 }); 1885 return; 1886 }, 1887 // invalid fields send the user back to the resolve form 1888 error.InvalidFields => { 1889 const form_location = try allocator.print("{s}/resolve", .{base}); 1890 defer allocator.free(form_location); 1891 try request.respond("", .{ 1892 .status = .see_other, 1893 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1894 }); 1895 return; 1896 }, 1897 else => |e| return e, 1898 }; 1899 1900 try request.respond("", .{ 1901 .status = .see_other, 1902 .extra_headers = &.{.{ .name = "location", .value = base }}, 1903 }); 1904 } 1905 1906 // the posted path drops the action's own segment, so the route it parses is 1907 // the undo page the action applies to, never the confirmation page itself 1908 fn handleUndo(io: std.Io, request: *std.http.Server.Request, allocator: std.mem.Allocator, base: []const u8, host: Host, action: enum { undo, clear }) !void { 1909 const route = routeFromUrl(host, base) orelse return respondRepoNotFound(request); 1910 if (route != .repo_undo) return respondRepoNotFound(request); 1911 const target = route.repo_undo; 1912 var arena = std.heap.ArenaAllocator.init(allocator); 1913 defer arena.deinit(); 1914 const repo_base = if (target.name.len == 0) "" else try arena.allocator().print("/{s}", .{target.name.slice()}); 1915 _ = (try authorizeWrite(io, allocator, &arena, request, host, repo_base, .owner, null)) orelse return; 1916 const resolved = (try requestRepoSource(io, allocator, host, repo_base)) orelse return respondRepoNotFound(request); 1917 defer resolved.deinit(allocator); 1918 (switch (action) { 1919 .undo => ui.Repo.Undo.execute(io, allocator, resolved.source, target.index orelse return respondRepoNotFound(request)), 1920 .clear => ui.Repo.Undo.clearHistory(io, allocator, resolved.source), 1921 }) catch |err| switch (err) { 1922 error.NotFound, error.InvalidHistoryIndex, error.TransactionNotFound => return respondRepoNotFound(request), 1923 else => return err, 1924 }; 1925 const location = try (ui.RoutablePage.repoUndoRoute(target.name.slice(), null) orelse return error.RouteTooLong).toUrl(&arena); 1926 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = location }} }); 1927 } 1928 1929 fn handleSync( 1930 io: std.Io, 1931 request: *std.http.Server.Request, 1932 allocator: std.mem.Allocator, 1933 base: []const u8, 1934 source: ui.RepoSource, 1935 ) !void { 1936 if (base.len != 0) { 1937 try request.respond("not found", .{ 1938 .status = .not_found, 1939 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1940 }); 1941 return; 1942 } 1943 1944 var owned_failure: ?[]u8 = null; 1945 defer if (owned_failure) |message| allocator.free(message); 1946 const failure: ?[]const u8 = blk: { 1947 owned_failure = ui.Repo.Events.sync(io, allocator, source) catch |err| break :blk @errorName(err); 1948 break :blk owned_failure; 1949 }; 1950 if (failure) |message| { 1951 var encoded: std.Io.Writer.Allocating = .init(allocator); 1952 defer encoded.deinit(); 1953 try std.Uri.Component.percentEncode(&encoded.writer, message, struct { 1954 fn isUnreserved(c: u8) bool { 1955 return std.ascii.isAlphanumeric(c) or c == '-' or c == '.' or c == '_' or c == '~'; 1956 } 1957 }.isUnreserved); 1958 const cookie = try allocator.print( 1959 local_flash_cookie ++ "=" ++ local_sync_failure_prefix ++ "{s}; Path=/; HttpOnly; SameSite=Strict", 1960 .{encoded.written()}, 1961 ); 1962 defer allocator.free(cookie); 1963 try request.respond("", .{ 1964 .status = .see_other, 1965 .extra_headers = &.{ 1966 .{ .name = "location", .value = "/events" }, 1967 .{ .name = "set-cookie", .value = cookie }, 1968 }, 1969 }); 1970 return; 1971 } 1972 1973 try request.respond("", .{ 1974 .status = .see_other, 1975 .extra_headers = &.{ 1976 .{ .name = "location", .value = "/events" }, 1977 .{ .name = "set-cookie", .value = local_flash_cookie ++ "=; Path=/; Max-Age=0" }, 1978 }, 1979 }); 1980 } 1981 1982 fn renderIndexHtml( 1983 io: std.Io, 1984 allocator: std.mem.Allocator, 1985 host: Host, 1986 session_token: ?[]const u8, 1987 session_data: ui.Session.Data, 1988 ) ![]const u8 { 1989 const template = (findEmbed("/index.html") orelse return error.MissingIndexAsset).body; 1990 1991 var page_arena = std.heap.ArenaAllocator.init(allocator); 1992 defer page_arena.deinit(); 1993 1994 // the server admin repo must outlive the page build, since the session's 1995 // moment reads from it. 1996 var repo_maybe: ?rp.Repo(.xit, evt.admin_repo_opts) = null; 1997 defer if (repo_maybe) |*repo| repo.deinit(io, allocator); 1998 1999 var session = switch (host) { 2000 .server => |server| blk: { 2001 // open the admin repo to read live user/repo data. 2002 repo_maybe = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 2003 const repo = if (repo_maybe) |*repo| repo else unreachable; 2004 var session = try ui.Session.init(&page_arena, repo, session_data); 2005 // the session dropped a user whose account was removed, so revoke 2006 // the token that named them 2007 if (session_token) |token| { 2008 if (session.data.user_id == null) server.session_store.remove(token); 2009 } 2010 // give the page builders filesystem access to the on-disk repos (a 2011 // sibling "users" dir next to the admin repo) so the Repo page can 2012 // read its files. 2013 session.users_dir = server.users_dir; 2014 break :blk session; 2015 }, 2016 .local => |local| ui.Session{ 2017 .data = session_data, 2018 .arena = &page_arena, 2019 .page_arena = &page_arena, 2020 .local = local, 2021 }, 2022 }; 2023 session.io = io; 2024 2025 var page = try ui.Page.init(session.page_arena, &session, session.data.current_page); 2026 var root = try ui.initRoot(allocator, &page, &session); 2027 defer root.deinit(allocator); 2028 2029 const snapshot: ui.Snapshot = .{ .page = page, .session = session.data }; 2030 2031 const content = try generateHtml(allocator, &root, &session); 2032 defer allocator.free(content); 2033 2034 // serialize the snapshot so the wasm side can parse it back without making 2035 // a second request. it's embedded raw in a <script type="application/json"> 2036 // block, whose content is raw text terminated only by "</script". in json, 2037 // '<' appears solely inside string values, so escaping every '<' (and '>' 2038 // for good measure) to its \uXXXX form yields equivalent json that can't 2039 // break out of the tag. 2040 var json: std.Io.Writer.Allocating = .init(allocator); 2041 defer json.deinit(); 2042 try std.json.Stringify.value(snapshot, .{}, &json.writer); 2043 2044 var json_escaped: std.ArrayList(u8) = .empty; 2045 defer json_escaped.deinit(allocator); 2046 for (json.written()) |c| switch (c) { 2047 '<' => try json_escaped.appendSlice(allocator, "\\u003c"), 2048 '>' => try json_escaped.appendSlice(allocator, "\\u003e"), 2049 else => try json_escaped.append(allocator, c), 2050 }; 2051 2052 var out: std.ArrayList(u8) = .empty; 2053 errdefer out.deinit(allocator); 2054 { 2055 var cursor: usize = 0; 2056 for (&[_]struct { needle: []const u8, replacement: []const u8 }{ 2057 .{ .needle = "{{{ HAXY_HTML }}}", .replacement = content }, 2058 .{ .needle = "{{{ HAXY_JSON }}}", .replacement = json_escaped.items }, 2059 }) |sub| { 2060 const idx = std.mem.indexOfPos(u8, template, cursor, sub.needle) orelse return error.MissingTemplateToken; 2061 try out.appendSlice(allocator, template[cursor..idx]); 2062 try out.appendSlice(allocator, sub.replacement); 2063 cursor = idx + sub.needle.len; 2064 } 2065 try out.appendSlice(allocator, template[cursor..]); 2066 } 2067 return try out.toOwnedSlice(allocator); 2068 } 2069 2070 fn findEmbed(request_path: []const u8) ?Embed { 2071 // embeds are matched before pages, so a dot keeps them from claiming a username or tab 2072 comptime for (embeds) |embed| { 2073 if (std.mem.indexOfScalar(u8, embed.path, '.') == null) @compileError("embed path needs a '.' so it can't shadow a page: " ++ embed.path); 2074 }; 2075 if (request_path.len < 2 or request_path[0] != '/') return null; 2076 const path = request_path[1..]; 2077 2078 for (embeds) |embed| { 2079 if (std.mem.eql(u8, path, embed.path)) return embed; 2080 } 2081 return null; 2082 } 2083 2084 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 2085 // own absolutely-positioned, natively-scrollable <div> holding its full content, 2086 // rendered recursively so nested scrolls work. 2087 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 2088 const grid = root.getGrid() orelse return error.MissingGrid; 2089 const root_focus = root.getFocus(); 2090 2091 var out: std.ArrayList(u8) = .empty; 2092 errdefer out.deinit(allocator); 2093 2094 switch (root.*) { 2095 .background => |*background| { 2096 if (background.art.getGrid()) |art| { 2097 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 }); 2098 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 2099 try out.appendSlice(allocator, "</div>"); 2100 } 2101 }, 2102 else => {}, 2103 } 2104 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 2105 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 2106 try out.appendSlice(allocator, "</div>"); 2107 try renderForms(allocator, &out, root_focus); 2108 return try out.toOwnedSlice(allocator); 2109 } 2110 2111 // render one panel — a focus subtree and its content grid — as HTML, recursing 2112 // once per web-native Scroll inside it. the root panel is the whole page; each 2113 // Scroll becomes a nested, natively-scrollable div holding its full content. 2114 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 2115 // then the child scroll divs over those holes. 2116 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 2117 // `direct` is this panel's scroll children, each drawn as an overlaid div. 2118 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 2119 // plus their descendants, which the focus tree flattens into this panel's 2120 // children): the cell hit-test below skips them so this panel doesn't claim 2121 // cells that are really rendered inside a child scroll's own panel. 2122 // (scrolls aren't nested in practice, so every scroll child is direct here.) 2123 var direct: std.ArrayList(usize) = .empty; 2124 defer direct.deinit(allocator); 2125 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 2126 defer excluded.deinit(allocator); 2127 { 2128 var it = focus.children.iterator(); 2129 while (it.next()) |e| { 2130 if (e.value_ptr.focus.scroll == null) continue; 2131 try direct.append(allocator, e.key_ptr.*); 2132 try excluded.put(allocator, e.key_ptr.*, {}); 2133 var mit = e.value_ptr.focus.children.iterator(); 2134 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 2135 } 2136 } 2137 2138 // the HTML element a run of cells is wrapped in, chosen from the cell's 2139 // focusable kind 2140 const CellTag = union(enum) { 2141 span, // clickable focusable cell 2142 a: []const u8, // clickable focusable link 2143 plain, // non-focusable, colored 2144 2145 const a_prefix = "a:"; 2146 // an "in-page" anchor: rendered as a real <a href> so it works with js 2147 // disabled, but wasm handles it without navigating. 2148 fn init(str: []const u8) @This() { 2149 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2150 return .{ .a = str[ui.raw_link_prefix.len..] }; 2151 } 2152 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2153 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2154 } 2155 if (std.mem.startsWith(u8, str, a_prefix)) { 2156 return .{ .a = str[a_prefix.len..] }; 2157 } 2158 return .span; 2159 } 2160 2161 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2162 var id_buf: [32]u8 = undefined; 2163 switch (self) { 2164 .span => { 2165 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2166 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2167 try out.appendSlice(alloc, "\""); 2168 try out.appendSlice(alloc, style_attr); 2169 try out.appendSlice(alloc, ">"); 2170 }, 2171 .a => |href| { 2172 // tabindex=-1 keeps these out of the browser's tab order 2173 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2174 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2175 try out.appendSlice(alloc, "\" href=\""); 2176 try appendEscapedHtml(alloc, out, href); 2177 try out.appendSlice(alloc, "\""); 2178 try out.appendSlice(alloc, style_attr); 2179 try out.appendSlice(alloc, ">"); 2180 }, 2181 .plain => { 2182 try out.appendSlice(alloc, "<span"); 2183 try out.appendSlice(alloc, style_attr); 2184 try out.appendSlice(alloc, ">"); 2185 }, 2186 } 2187 } 2188 2189 fn closeTag(self: @This()) []const u8 { 2190 return switch (self) { 2191 .span, .plain => "</span>", 2192 .a => "</a>", 2193 }; 2194 } 2195 }; 2196 2197 // the focusable owning each cell, among this panel's own (skipping any 2198 // that belong to a child scroll, whose cells are drawn in their own panel). 2199 // claimed in focus order, so the first focusable over a cell keeps it. 2200 // looking every focusable up for every cell is quadratic in a long list. 2201 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2202 defer allocator.free(owners); 2203 @memset(owners, null); 2204 { 2205 var it = focus.children.iterator(); 2206 while (it.next()) |entry| { 2207 const child = entry.value_ptr.*; 2208 if (child.focus.mode != .all) continue; 2209 if (excluded.contains(entry.key_ptr.*)) continue; 2210 const r = child.rect; 2211 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2212 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2213 const owner = &owners[y * grid.size.width + x]; 2214 if (owner.* == null) owner.* = entry.key_ptr.*; 2215 } 2216 } 2217 } 2218 } 2219 2220 // the cells are the volatile part of a panel. js replaces this one subtree 2221 // wholesale while retaining the panel's native controls and scroll shells. 2222 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2223 2224 // emit this panel's grid as rows of text, coalescing adjacent cells that 2225 // share a focus id and style into one tag (a clickable span, a link, or a 2226 // plain styled span). cells under a child scroll keep only their background. 2227 // a cell's own link is an anchor nested in that tag. 2228 for (0..grid.size.height) |y| { 2229 var cur_id: ?usize = null; 2230 var cur_style: Grid.Style = .{}; 2231 var open_tag: ?CellTag = null; 2232 var open_link: ?[]const u8 = null; 2233 var first = true; 2234 for (0..grid.size.width) |x| { 2235 const cell = (try grid.cell(x, y)).*; 2236 // a cell covered by a child scroll's viewport is drawn by that scroll's 2237 // own div, so blank its glyph and make it non-clickable here — but keep 2238 // its background, so the backdrop still shows through the scroll's 2239 // transparent div instead of a bare hole. 2240 const covered_by_scroll = blk: { 2241 for (direct.items) |id| { 2242 const r = (focus.children.get(id) orelse continue).rect; 2243 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; 2244 } 2245 break :blk false; 2246 }; 2247 // the focusable owning the cell at (x, y); none for a covered cell. 2248 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2249 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2250 2251 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2252 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2253 open_link = null; 2254 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2255 2256 var new_tag: ?CellTag = null; 2257 if (cell_id) |id| { 2258 if (focus.children.get(id)) |child| { 2259 new_tag = switch (child.focus.kind) { 2260 .custom => |custom| CellTag.init(custom), 2261 else => .span, 2262 }; 2263 } 2264 } 2265 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2266 2267 if (new_tag) |t| { 2268 var style_buf: [192]u8 = undefined; 2269 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2270 } 2271 2272 open_tag = new_tag; 2273 cur_id = cell_id; 2274 cur_style = style; 2275 first = false; 2276 } 2277 2278 // an anchor can't nest in another, so a link tag's cells skip theirs 2279 const in_anchor = if (open_tag) |t| t == .a else false; 2280 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2281 if (!sameLink(link, open_link)) { 2282 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2283 if (link) |url| { 2284 // a page path opens in this tab, any other url in a new one 2285 try output.appendSlice(allocator, if (url[0] == '/') 2286 "<a class=\"cell-link\" tabindex=\"-1\" href=\"" 2287 else 2288 "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2289 try appendEscapedHtml(allocator, output, url); 2290 try output.appendSlice(allocator, "\">"); 2291 } 2292 open_link = link; 2293 } 2294 2295 if (covered_by_scroll) { 2296 try appendEscapedHtml(allocator, output, " "); 2297 } else if (cell.continuation) { 2298 // the wide rune to the left was emitted 2ch wide, covering this column 2299 } else if (cell.rune) |rune| { 2300 var encoded: [4]u8 = undefined; 2301 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2302 const rune_text = encoded[0..encoded_len]; 2303 // a double-width rune is pinned inside a 2ch span so the 2304 // fallback glyph's advance width can't shift the rest of the row 2305 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2306 if (wide) { 2307 try output.appendSlice(allocator, "<span class=\"w2\">"); 2308 try appendEscapedHtml(allocator, output, rune_text); 2309 try output.appendSlice(allocator, "</span>"); 2310 } else { 2311 try appendEscapedHtml(allocator, output, rune_text); 2312 } 2313 } else { 2314 try appendEscapedHtml(allocator, output, " "); 2315 } 2316 } 2317 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2318 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2319 try output.append(allocator, '\n'); 2320 } 2321 try output.appendSlice(allocator, "</div>"); 2322 2323 // native controls live in their panel, beside the replaceable cells. their 2324 // stable keys let JS update layout without recreating their DOM nodes, and 2325 // being actual descendants of a scroll gives them native movement/clipping. 2326 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2327 2328 // each child scroll becomes a natively-scrollable div positioned over its 2329 // viewport, holding its full content rendered recursively. 2330 for (direct.items) |id| { 2331 const child = focus.children.get(id) orelse continue; 2332 const info = child.focus.scroll orelse continue; 2333 const r = child.rect; 2334 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2335 // when that axis actually overflows. the other axis is clipped (hidden), 2336 // matching how the terminal Scroll handles its non-scrolling axis. 2337 const overflow = switch (info.direction) { 2338 .vert => "overflow-x:hidden;overflow-y:auto", 2339 .horiz => "overflow-x:auto;overflow-y:hidden", 2340 .both => "overflow:auto", 2341 }; 2342 // the id carries a content version so JS preserves the native scroll 2343 // position across re-renders of the same content but resets it when the 2344 // content is replaced — e.g. selecting a different commit. the widget's 2345 // scroll offset (in cells) rides along so JS can apply it when it has no 2346 // preserved position, letting a wasm-side scrollToRect (the files list 2347 // scrolling to its selected row on page load) reach the browser. 2348 var buf: [256]u8 = undefined; 2349 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 })); 2350 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2351 try output.appendSlice(allocator, "</div>"); 2352 } 2353 } 2354 2355 const form_prefix = "form:"; 2356 const form_id_prefix = "haxy-form-"; 2357 2358 fn formAction(focus: *const Focus) ?[]const u8 { 2359 return switch (focus.kind) { 2360 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2361 else => null, 2362 }; 2363 } 2364 2365 // find the form ancestor of a flattened focus-tree child. html's `form` 2366 // attribute then associates the control with that form without requiring the 2367 // form and control to share a DOM parent. 2368 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2369 var id = focus_id; 2370 while (root_focus.children.get(id)) |child| { 2371 const parent_id = child.parent_id; 2372 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2373 const parent = root_focus.children.get(parent_id) orelse return null; 2374 if (formAction(parent.focus) != null) return parent_id; 2375 id = parent_id; 2376 } 2377 return null; 2378 } 2379 2380 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2381 const form_id = formOwner(root_focus, focus_id) orelse return; 2382 var buf: [64]u8 = undefined; 2383 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2384 } 2385 2386 fn renderPanelControls( 2387 allocator: std.mem.Allocator, 2388 output: *std.ArrayList(u8), 2389 focus: *Focus, 2390 session: *ui.Session, 2391 root_focus: *Focus, 2392 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2393 ) !void { 2394 var iter = focus.children.iterator(); 2395 while (iter.next()) |entry| { 2396 const id = entry.key_ptr.*; 2397 if (excluded.contains(id)) continue; 2398 const child = entry.value_ptr.*; 2399 const r = child.rect; 2400 2401 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2402 2403 switch (child.focus.kind) { 2404 .text_input, .text_input_password, .text_area => { 2405 const ti = session.text_inputs.get(id) orelse continue; 2406 2407 const inner_left = r.x + 1; 2408 const inner_top = r.y + 1; 2409 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2410 const preserve = !ti.options.read_only; 2411 2412 if (child.focus.kind == .text_area) { 2413 const value = try ti.text(allocator); 2414 defer allocator.free(value); 2415 var id_buf: [128]u8 = undefined; 2416 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2417 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2418 try appendFormAttribute(allocator, output, root_focus, id); 2419 if (ti.options.name.len > 0) { 2420 try output.appendSlice(allocator, " name=\""); 2421 try appendEscapedHtml(allocator, output, ti.options.name); 2422 try output.append(allocator, '"'); 2423 } 2424 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2425 var pos_buf: [128]u8 = undefined; 2426 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 })); 2427 try appendEscapedHtml(allocator, output, value); 2428 try output.appendSlice(allocator, "</textarea>"); 2429 continue; 2430 } 2431 2432 var id_buf: [160]u8 = undefined; 2433 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 })); 2434 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2435 try appendFormAttribute(allocator, output, root_focus, id); 2436 if (ti.options.name.len > 0) { 2437 try output.appendSlice(allocator, " name=\""); 2438 try appendEscapedHtml(allocator, output, ti.options.name); 2439 try output.append(allocator, '"'); 2440 } 2441 if (child.focus.kind != .text_input_password) { 2442 const value = try ti.text(allocator); 2443 defer allocator.free(value); 2444 try output.appendSlice(allocator, " value=\""); 2445 try appendEscapedHtml(allocator, output, value); 2446 try output.append(allocator, '"'); 2447 } 2448 var pos_buf: [96]u8 = undefined; 2449 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 })); 2450 }, 2451 .custom => |custom| { 2452 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2453 if (formOwner(root_focus, id) == null) continue; 2454 var id_buf: [128]u8 = undefined; 2455 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2456 try appendFormAttribute(allocator, output, root_focus, id); 2457 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2458 try output.appendSlice(allocator, " formaction=\""); 2459 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2460 try output.append(allocator, '"'); 2461 } 2462 var pos_buf: [128]u8 = undefined; 2463 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 })); 2464 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2465 // an invisible native radio over the option, checked when the option is its row's selection 2466 const field = custom[ui.radio_prefix.len..]; 2467 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2468 const row = root_focus.children.get(child.parent_id) orelse continue; 2469 var id_buf: [128]u8 = undefined; 2470 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2471 try appendFormAttribute(allocator, output, root_focus, id); 2472 try output.appendSlice(allocator, " name=\""); 2473 try appendEscapedHtml(allocator, output, field[0..separator]); 2474 try output.appendSlice(allocator, "\" value=\""); 2475 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2476 try output.append(allocator, '"'); 2477 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2478 var pos_buf: [128]u8 = undefined; 2479 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 })); 2480 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2481 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2482 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2483 var id_buf: [128]u8 = undefined; 2484 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 })); 2485 } 2486 }, 2487 else => {}, 2488 } 2489 } 2490 } 2491 2492 // emit hidden form owners beside the rendered panels. their controls point 2493 // back here with the standard HTML `form` attribute. 2494 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2495 // the focus child map preserves insertion order, which matches the order 2496 // widgets were added in code 2497 var iter = root_focus.children.iterator(); 2498 while (iter.next()) |entry| { 2499 const child = entry.value_ptr.*; 2500 const action_url = formAction(child.focus) orelse continue; 2501 2502 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2503 var id_buf: [96]u8 = undefined; 2504 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2505 try appendEscapedHtml(allocator, output, action_url); 2506 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2507 } 2508 } 2509 2510 // the 16 ansi colors as the browser shows them (xterm's defaults) 2511 const ansi_palette = [16]Grid.Color.Rgb{ 2512 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2513 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2514 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2515 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2516 }; 2517 2518 // resolve any color to rgb: palette colors through the ansi table and the 2519 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2520 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2521 return switch (color) { 2522 .rgb => |c| c, 2523 .ansi => |a| ansi_palette[@backingInt(a)], 2524 .indexed => |n| if (n < 16) 2525 ansi_palette[n] 2526 else if (n < 232) blk: { 2527 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2528 const i = n - 16; 2529 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2530 } else blk: { 2531 const v: u8 = 8 + (n - 232) * 10; 2532 break :blk .{ .r = v, .g = v, .b = v }; 2533 }, 2534 }; 2535 } 2536 2537 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2538 // cell's style into `buf`, omitting whichever color is unset. an inverted 2539 // cell swaps the two, falling back to the page's --fg/--bg variables for 2540 // whichever side is unset. text attributes follow the colors. returns an 2541 // empty slice when nothing is set. 2542 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2543 if (style.eql(.{})) return buf[0..0]; 2544 const prefix = " style=\""; 2545 @memcpy(buf[0..prefix.len], prefix); 2546 var i: usize = prefix.len; 2547 const inverted = style.inverted; 2548 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2549 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2550 const decoration: []const u8 = if (style.underline and style.strikethrough) 2551 "text-decoration:underline line-through;" 2552 else if (style.underline) 2553 "text-decoration:underline;" 2554 else if (style.strikethrough) 2555 "text-decoration:line-through;" 2556 else 2557 ""; 2558 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2559 if (style.bold) "font-weight:bold;" else "", 2560 if (style.italic) "font-style:italic;" else "", 2561 decoration, 2562 if (style.dim) "opacity:.6;" else "", 2563 }) catch return buf[0..0]; 2564 i += attributes.len; 2565 if (i >= buf.len) return buf[0..0]; 2566 buf[i] = '"'; 2567 return buf[0 .. i + 1]; 2568 } 2569 2570 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2571 // the color is unset (nothing when both are). returns the new end, or null 2572 // when it doesn't fit. 2573 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2574 const s = if (color) |c| blk: { 2575 const v = colorRgb(c); 2576 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; 2577 } else if (fallback) |f| 2578 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2579 else 2580 return i; 2581 return i + s.len; 2582 } 2583 2584 // a cell's link as an href, when it's a page path or a web or mail url 2585 fn webLink(link: ?[]const u8) ?[]const u8 { 2586 const url = link orelse return null; 2587 // a page path, not a protocol-relative url 2588 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2589 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2590 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2591 } 2592 return null; 2593 } 2594 2595 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2596 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2597 return b == null; 2598 } 2599 2600 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2601 for (input) |ch| { 2602 switch (ch) { 2603 '&' => try out.appendSlice(allocator, "&amp;"), 2604 '<' => try out.appendSlice(allocator, "&lt;"), 2605 '>' => try out.appendSlice(allocator, "&gt;"), 2606 '"' => try out.appendSlice(allocator, "&quot;"), 2607 '\'' => try out.appendSlice(allocator, "&#39;"), 2608 else => try out.append(allocator, ch), 2609 } 2610 } 2611 } 2612 2613 // --- helpers -------------------------------------------------------------- 2614 2615 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2616 var iter = request.iterateHeaders(); 2617 while (iter.next()) |header| { 2618 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2619 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2620 while (pairs.next()) |pair| { 2621 const trimmed = std.mem.trim(u8, pair, " \t"); 2622 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2623 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2624 return trimmed[eq + 1 ..]; 2625 } 2626 } 2627 } 2628 return null; 2629 } 2630 2631 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2632 var iter = std.mem.splitScalar(u8, body, '&'); 2633 while (iter.next()) |pair| { 2634 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2635 if (std.mem.eql(u8, pair[0..eq], key)) { 2636 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2637 } 2638 } 2639 return null; 2640 } 2641 2642 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2643 var buffer: [256]u8 = undefined; 2644 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2645 } 2646 2647 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2648 var out: std.ArrayList(u8) = .empty; 2649 errdefer out.deinit(allocator); 2650 var i: usize = 0; 2651 while (i < encoded.len) : (i += 1) { 2652 switch (encoded[i]) { 2653 '+' => try out.append(allocator, ' '), 2654 '%' => { 2655 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2656 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2657 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2658 try out.append(allocator, hi * 16 + lo); 2659 i += 2; 2660 }, 2661 else => try out.append(allocator, encoded[i]), 2662 } 2663 } 2664 return try out.toOwnedSlice(allocator); 2665 } 2666 2667 // disk-backed web session store. each login mints a random, opaque token 2668 // (not the user's id) that is stored as a file named by the token hex, whose 2669 // contents are the raw user_id bytes. authenticating a request is a lookup of 2670 // the cookie's token; logout deletes the file, revoking the session. there is 2671 // deliberately no expiry — a session lives until logout. form failures use 2672 // files in the flash subdirectory that the redirected GET consumes. the 2673 // directory is cleared whenever the server starts. 2674 pub const SessionStore = struct { 2675 io: std.Io, 2676 dir: std.Io.Dir, 2677 flash_dir: std.Io.Dir, 2678 auto_login: ?[token_hex_len]u8, 2679 2680 pub const token_hex_len = evt.event_id_size * 2; 2681 2682 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2683 try data_dir.createDirPath(io, "sessions"); 2684 const dir = try data_dir.openDir(io, "sessions", .{}); 2685 errdefer dir.close(io); 2686 try dir.deleteTree(io, "flash"); 2687 try dir.createDirPath(io, "flash"); 2688 const flash_dir = try dir.openDir(io, "flash", .{}); 2689 errdefer flash_dir.close(io); 2690 const auto_login = blk: { 2691 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2692 defer file.close(io); 2693 var token: [token_hex_len]u8 = undefined; 2694 var storage: [token_hex_len]u8 = undefined; 2695 var reader = file.reader(io, &storage); 2696 reader.interface.readSliceAll(&token) catch break :blk null; 2697 break :blk token; 2698 }; 2699 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2700 } 2701 2702 pub fn deinit(self: SessionStore) void { 2703 self.flash_dir.close(self.io); 2704 self.dir.close(self.io); 2705 } 2706 2707 // mint a new session for user_id, returning the token hex to set as the 2708 // cookie value. 2709 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2710 var token: [evt.event_id_size]u8 = undefined; 2711 self.io.random(&token); 2712 const token_hex = std.fmt.bytesToHex(token, .lower); 2713 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2714 defer file.close(self.io); 2715 try file.writeStreamingAll(self.io, user_id); 2716 return token_hex; 2717 } 2718 2719 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2720 var token: [evt.event_id_size]u8 = undefined; 2721 self.io.random(&token); 2722 const token_hex = std.fmt.bytesToHex(token, .lower); 2723 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2724 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2725 defer file.close(self.io); 2726 2727 var json: std.Io.Writer.Allocating = .init(allocator); 2728 defer json.deinit(); 2729 try std.json.Stringify.value(value, .{}, &json.writer); 2730 try file.writeStreamingAll(self.io, json.written()); 2731 return token_hex; 2732 } 2733 2734 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2735 if (!isToken(token_hex)) return null; 2736 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2737 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2738 defer file.close(self.io); 2739 2740 var storage: [4096]u8 = undefined; 2741 var reader = file.reader(self.io, &storage); 2742 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2743 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2744 } 2745 2746 // resolve a cookie's token to its user_id. returns false (logged out) for a 2747 // missing, malformed, or unknown token. 2748 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2749 if (!isToken(token_hex)) return false; 2750 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2751 defer file.close(self.io); 2752 var storage: [evt.event_id_size]u8 = undefined; 2753 var file_reader = file.reader(self.io, &storage); 2754 file_reader.interface.readSliceAll(out) catch return false; 2755 return true; 2756 } 2757 2758 // revoke a session. a no-op for a missing or malformed token. 2759 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2760 if (!isToken(token_hex)) return; 2761 self.dir.deleteFile(self.io, token_hex) catch {}; 2762 } 2763 2764 // leave `token_hex`'s session for visitors arriving without one. only the 2765 // `try` fixture writes one. the name can't collide with a session token. 2766 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2767 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2768 defer file.close(self.io); 2769 try file.writeStreamingAll(self.io, token_hex); 2770 } 2771 2772 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2773 out.* = self.auto_login orelse return false; 2774 return true; 2775 } 2776 2777 const auto_login_name = "auto-login"; 2778 2779 // a token is exactly token_hex_len hex chars. validating before using the 2780 // value as a path keeps attacker-supplied cookies from escaping the 2781 // sessions dir (e.g. via "/" or ".." bytes). 2782 fn isToken(token_hex: []const u8) bool { 2783 if (token_hex.len != token_hex_len) return false; 2784 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2785 return true; 2786 } 2787 }; 2788