╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭cc0f272a..╮ cc0f272a.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (616) 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 │ ╰─────────────────────────────────╯
1750 var hunks: std.ArrayList([]const u8) = .empty; 1751 var hunk_index: usize = 0; 1752 while (true) : (hunk_index += 1) { 1753 const name = try std.fmt.allocPrint(aa, "d{d}", .{hunk_index}); 1754 const submitted = (try parseFormField(aa, body, name)) orelse break; 1755 try hunks.append(aa, try std.mem.replaceOwned(u8, aa, submitted, "\r\n", "\n")); 1756 } 1757 1758 if (parts.comment_id != null or (parts.thread_kind != .issue and parts.thread_kind != .patch)) { 1759 try request.respond("thread not found", .{ 1760 .status = .not_found, 1761 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1762 }); 1763 return; 1764 } 1765 const route = ui.RoutablePage.fromUrl(base) orelse ui.RoutablePage.fromUrlLocal(base) orelse { 1766 try request.respond("thread not found", .{ 1767 .status = .not_found, 1768 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1769 }); 1770 return; 1771 }; 1772 const theirs: []const u8 = switch (route) { 1773 .repo_patches => |*patch| patch.theirs.slice(), 1774 .repo_issues => "", 1775 else => unreachable, 1776 }; 1777 const not_found = if (parts.thread_kind == .patch) "patch not found" else "issue not found"; 1778 1779 (switch (parts.thread_kind) { 1780 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1781 .title = title, 1782 .labels = labels, 1783 .hunks = hunks.items, 1784 } }, author), 1785 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 1786 .title = title, 1787 .labels = labels, 1788 .hunks = hunks.items, 1789 .theirs = theirs, 1790 } }, author), 1791 else => unreachable, 1792 }) catch |err| switch (err) { 1793 error.NotFound => { 1794 try request.respond(not_found, .{ 1795 .status = .not_found, 1796 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1797 }); 1798 return; 1799 }, 1800 // invalid fields send the user back to the resolve form 1801 error.InvalidFields => { 1802 const form_location = try std.fmt.allocPrint(allocator, "{s}/resolve", .{base}); 1803 defer allocator.free(form_location); 1804 try request.respond("", .{ 1805 .status = .see_other, 1806 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1807 }); 1808 return; 1809 }, 1810 else => |e| return e, 1811 }; 1812 1813 try request.respond("", .{ 1814 .status = .see_other, 1815 .extra_headers = &.{.{ .name = "location", .value = base }}, 1816 }); 1817 } 1818 1819 // the posted path drops the action's own segment, so the route it parses is 1820 // the undo page the action applies to, never the confirmation page itself 1821 fn handleUndo(io: std.Io, request: *std.http.Server.Request, allocator: std.mem.Allocator, base: []const u8, host: Host, action: enum { undo, clear }) !void { 1822 const route = (switch (host) { 1823 .local => ui.RoutablePage.fromUrlLocal(base), 1824 .server => ui.RoutablePage.fromUrl(base), 1825 }) orelse return respondRepoNotFound(request); 1826 if (route != .repo_undo) return respondRepoNotFound(request); 1827 const target = route.repo_undo; 1828 var arena = std.heap.ArenaAllocator.init(allocator); 1829 defer arena.deinit(); 1830 const repo_base = if (target.name.len == 0) "" else try std.fmt.allocPrint(arena.allocator(), "/repo/{s}", .{target.name.slice()}); 1831 _ = (try authorizeWrite(io, allocator, &arena, request, host, repo_base, .owner)) orelse return; 1832 const resolved = (try requestRepoSource(io, allocator, host, repo_base)) orelse return respondRepoNotFound(request); 1833 defer resolved.deinit(allocator); 1834 (switch (action) { 1835 .undo => ui.Repo.Undo.execute(io, allocator, resolved.source, target.index orelse return respondRepoNotFound(request)), 1836 .clear => ui.Repo.Undo.clearHistory(io, allocator, resolved.source), 1837 }) catch |err| switch (err) { 1838 error.NotFound, error.InvalidHistoryIndex, error.TransactionNotFound => return respondRepoNotFound(request), 1839 else => return err, 1840 }; 1841 const location = try (ui.RoutablePage.repoUndoRoute(target.name.slice(), null) orelse return error.RouteTooLong).toUrl(&arena); 1842 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = location }} }); 1843 } 1844 1845 fn handleSync( 1846 io: std.Io, 1847 request: *std.http.Server.Request, 1848 allocator: std.mem.Allocator, 1849 base: []const u8, 1850 source: ui.RepoSource, 1851 ) !void { 1852 if (base.len != 0) { 1853 try request.respond("not found", .{ 1854 .status = .not_found, 1855 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1856 }); 1857 return; 1858 } 1859 1860 var owned_failure: ?[]u8 = null; 1861 defer if (owned_failure) |message| allocator.free(message); 1862 const failure: ?[]const u8 = blk: { 1863 owned_failure = ui.Repo.Events.sync(io, allocator, source) catch |err| break :blk @errorName(err); 1864 break :blk owned_failure; 1865 }; 1866 if (failure) |message| { 1867 var encoded: std.Io.Writer.Allocating = .init(allocator); 1868 defer encoded.deinit(); 1869 try std.Uri.Component.percentEncode(&encoded.writer, message, struct { 1870 fn isUnreserved(c: u8) bool { 1871 return std.ascii.isAlphanumeric(c) or c == '-' or c == '.' or c == '_' or c == '~'; 1872 } 1873 }.isUnreserved); 1874 const cookie = try std.fmt.allocPrint( 1875 allocator, 1876 local_flash_cookie ++ "=" ++ local_sync_failure_prefix ++ "{s}; Path=/; HttpOnly; SameSite=Strict", 1877 .{encoded.written()}, 1878 ); 1879 defer allocator.free(cookie); 1880 try request.respond("", .{ 1881 .status = .see_other, 1882 .extra_headers = &.{ 1883 .{ .name = "location", .value = "/events" }, 1884 .{ .name = "set-cookie", .value = cookie }, 1885 }, 1886 }); 1887 return; 1888 } 1889 1890 try request.respond("", .{ 1891 .status = .see_other, 1892 .extra_headers = &.{ 1893 .{ .name = "location", .value = "/events" }, 1894 .{ .name = "set-cookie", .value = local_flash_cookie ++ "=; Path=/; Max-Age=0" }, 1895 }, 1896 }); 1897 } 1898 1899 fn renderIndexHtml( 1900 io: std.Io, 1901 allocator: std.mem.Allocator, 1902 host: Host, 1903 session_token: ?[]const u8, 1904 session_data: ui.Session.Data, 1905 ) ![]const u8 { 1906 const template = (findEmbed("/index.html") orelse return error.MissingIndexAsset).body; 1907 1908 var page_arena = std.heap.ArenaAllocator.init(allocator); 1909 defer page_arena.deinit(); 1910 1911 // the server admin repo must outlive the page build, since the session's 1912 // moment reads from it. 1913 var repo_maybe: ?rp.Repo(.xit, evt.admin_repo_opts) = null; 1914 defer if (repo_maybe) |*repo| repo.deinit(io, allocator); 1915 1916 var session = switch (host) { 1917 .server => |server| blk: { 1918 // open the admin repo to read live user/repo data. 1919 repo_maybe = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1920 const repo = if (repo_maybe) |*repo| repo else unreachable; 1921 var session = try ui.Session.init(&page_arena, repo, session_data); 1922 // the session dropped a user whose account was removed, so revoke 1923 // the token that named them 1924 if (session_token) |token| { 1925 if (session.data.user_id == null) server.session_store.remove(token); 1926 } 1927 // give the page builders filesystem access to the on-disk repos (a 1928 // sibling "users" dir next to the admin repo) so the Repo page can 1929 // read its files. 1930 session.users_dir = server.users_dir; 1931 break :blk session; 1932 }, 1933 .local => |local| ui.Session{ 1934 .data = session_data, 1935 .arena = &page_arena, 1936 .page_arena = &page_arena, 1937 .local = local, 1938 }, 1939 }; 1940 session.io = io; 1941 1942 var page = try ui.Page.init(session.page_arena, &session, session.data.current_page); 1943 var root = try ui.initRoot(allocator, &page, &session); 1944 defer root.deinit(allocator); 1945 1946 const snapshot: ui.Snapshot = .{ .page = page, .session = session.data }; 1947 1948 const content = try generateHtml(allocator, &root, &session); 1949 defer allocator.free(content); 1950 1951 // serialize the snapshot so the wasm side can parse it back without making 1952 // a second request. it's embedded raw in a <script type="application/json"> 1953 // block, whose content is raw text terminated only by "</script". in json, 1954 // '<' appears solely inside string values, so escaping every '<' (and '>' 1955 // for good measure) to its \uXXXX form yields equivalent json that can't 1956 // break out of the tag. 1957 var json: std.Io.Writer.Allocating = .init(allocator); 1958 defer json.deinit(); 1959 try std.json.Stringify.value(snapshot, .{}, &json.writer); 1960 1961 var json_escaped: std.ArrayList(u8) = .empty; 1962 defer json_escaped.deinit(allocator); 1963 for (json.written()) |c| switch (c) { 1964 '<' => try json_escaped.appendSlice(allocator, "\\u003c"), 1965 '>' => try json_escaped.appendSlice(allocator, "\\u003e"), 1966 else => try json_escaped.append(allocator, c), 1967 }; 1968 1969 var out: std.ArrayList(u8) = .empty; 1970 errdefer out.deinit(allocator); 1971 { 1972 var cursor: usize = 0; 1973 for (&[_]struct { needle: []const u8, replacement: []const u8 }{ 1974 .{ .needle = "{{{ HAXY_HTML }}}", .replacement = content }, 1975 .{ .needle = "{{{ HAXY_JSON }}}", .replacement = json_escaped.items }, 1976 }) |sub| { 1977 const idx = std.mem.indexOfPos(u8, template, cursor, sub.needle) orelse return error.MissingTemplateToken; 1978 try out.appendSlice(allocator, template[cursor..idx]); 1979 try out.appendSlice(allocator, sub.replacement); 1980 cursor = idx + sub.needle.len; 1981 } 1982 try out.appendSlice(allocator, template[cursor..]); 1983 } 1984 return try out.toOwnedSlice(allocator); 1985 } 1986 1987 fn findEmbed(request_path: []const u8) ?Embed { 1988 const path = if (std.mem.eql(u8, request_path, "/")) 1989 "index.html" 1990 else if (request_path.len > 1 and request_path[0] == '/') 1991 request_path[1..] 1992 else 1993 return null; 1994 1995 for (embeds) |embed| { 1996 if (std.mem.eql(u8, path, embed.path)) return embed; 1997 } 1998 return null; 1999 } 2000 2001 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 2002 // own absolutely-positioned, natively-scrollable <div> holding its full content, 2003 // rendered recursively so nested scrolls work. 2004 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 2005 const grid = root.getGrid() orelse return error.MissingGrid; 2006 const root_focus = root.getFocus(); 2007 2008 var out: std.ArrayList(u8) = .empty; 2009 errdefer out.deinit(allocator); 2010 2011 switch (root.*) { 2012 .background => |*background| { 2013 if (background.art.getGrid()) |art| { 2014 var position_buf: [64]u8 = undefined; 2015 try out.appendSlice(allocator, try std.fmt.bufPrint(&position_buf, "<div class=\"ansi-art\" aria-hidden=\"true\" style=\"left:{d}ch\">", .{grid.size.width -| art.size.width})); 2016 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 2017 try out.appendSlice(allocator, "</div>"); 2018 } 2019 }, 2020 else => {}, 2021 } 2022 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 2023 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 2024 try out.appendSlice(allocator, "</div>"); 2025 try renderForms(allocator, &out, root_focus); 2026 return try out.toOwnedSlice(allocator); 2027 } 2028 2029 // render one panel — a focus subtree and its content grid — as HTML, recursing 2030 // once per web-native Scroll inside it. the root panel is the whole page; each 2031 // Scroll becomes a nested, natively-scrollable div holding its full content. 2032 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 2033 // then the child scroll divs over those holes. 2034 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 2035 // `direct` is this panel's scroll children, each drawn as an overlaid div. 2036 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 2037 // plus their descendants, which the focus tree flattens into this panel's 2038 // children): the cell hit-test below skips them so this panel doesn't claim 2039 // cells that are really rendered inside a child scroll's own panel. 2040 // (scrolls aren't nested in practice, so every scroll child is direct here.) 2041 var direct: std.ArrayList(usize) = .empty; 2042 defer direct.deinit(allocator); 2043 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 2044 defer excluded.deinit(allocator); 2045 { 2046 var it = focus.children.iterator(); 2047 while (it.next()) |e| { 2048 if (e.value_ptr.focus.scroll == null) continue; 2049 try direct.append(allocator, e.key_ptr.*); 2050 try excluded.put(allocator, e.key_ptr.*, {}); 2051 var mit = e.value_ptr.focus.children.iterator(); 2052 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 2053 } 2054 } 2055 2056 // the HTML element a run of cells is wrapped in, chosen from the cell's 2057 // focusable kind 2058 const CellTag = union(enum) { 2059 span, // clickable focusable cell 2060 a: []const u8, // clickable focusable link 2061 plain, // non-focusable, colored 2062 2063 const a_prefix = "a:"; 2064 // an "in-page" anchor: rendered as a real <a href> so it works with js 2065 // disabled, but wasm handles it without navigating. 2066 fn init(str: []const u8) @This() { 2067 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2068 return .{ .a = str[ui.raw_link_prefix.len..] }; 2069 } 2070 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2071 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2072 } 2073 if (std.mem.startsWith(u8, str, a_prefix)) { 2074 return .{ .a = str[a_prefix.len..] }; 2075 } 2076 return .span; 2077 } 2078 2079 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2080 var id_buf: [32]u8 = undefined; 2081 switch (self) { 2082 .span => { 2083 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2084 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2085 try out.appendSlice(alloc, "\""); 2086 try out.appendSlice(alloc, style_attr); 2087 try out.appendSlice(alloc, ">"); 2088 }, 2089 .a => |href| { 2090 // tabindex=-1 keeps these out of the browser's tab order 2091 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2092 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2093 try out.appendSlice(alloc, "\" href=\""); 2094 try appendEscapedHtml(alloc, out, href); 2095 try out.appendSlice(alloc, "\""); 2096 try out.appendSlice(alloc, style_attr); 2097 try out.appendSlice(alloc, ">"); 2098 }, 2099 .plain => { 2100 try out.appendSlice(alloc, "<span"); 2101 try out.appendSlice(alloc, style_attr); 2102 try out.appendSlice(alloc, ">"); 2103 }, 2104 } 2105 } 2106 2107 fn closeTag(self: @This()) []const u8 { 2108 return switch (self) { 2109 .span, .plain => "</span>", 2110 .a => "</a>", 2111 }; 2112 } 2113 }; 2114 2115 // the focusable owning each cell, among this panel's own (skipping any 2116 // that belong to a child scroll, whose cells are drawn in their own panel). 2117 // claimed in focus order, so the first focusable over a cell keeps it. 2118 // looking every focusable up for every cell is quadratic in a long list. 2119 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2120 defer allocator.free(owners); 2121 @memset(owners, null); 2122 { 2123 var it = focus.children.iterator(); 2124 while (it.next()) |entry| { 2125 const child = entry.value_ptr.*; 2126 if (child.focus.mode != .all) continue; 2127 if (excluded.contains(entry.key_ptr.*)) continue; 2128 const r = child.rect; 2129 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2130 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2131 const owner = &owners[y * grid.size.width + x]; 2132 if (owner.* == null) owner.* = entry.key_ptr.*; 2133 } 2134 } 2135 } 2136 } 2137 2138 // the cells are the volatile part of a panel. js replaces this one subtree 2139 // wholesale while retaining the panel's native controls and scroll shells. 2140 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2141 2142 // emit this panel's grid as rows of text, coalescing adjacent cells that 2143 // share a focus id and style into one tag (a clickable span, a link, or a 2144 // plain styled span). cells under a child scroll keep only their background. 2145 // a cell's own link is an anchor nested in that tag. 2146 for (0..grid.size.height) |y| { 2147 var cur_id: ?usize = null; 2148 var cur_style: Grid.Style = .{}; 2149 var open_tag: ?CellTag = null; 2150 var open_link: ?[]const u8 = null; 2151 var first = true; 2152 for (0..grid.size.width) |x| { 2153 const cell = (try grid.cell(x, y)).*; 2154 // a cell covered by a child scroll's viewport is drawn by that scroll's 2155 // own div, so blank its glyph and make it non-clickable here — but keep 2156 // its background, so the backdrop still shows through the scroll's 2157 // transparent div instead of a bare hole. 2158 const covered_by_scroll = blk: { 2159 for (direct.items) |id| { 2160 const r = (focus.children.get(id) orelse continue).rect; 2161 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; 2162 } 2163 break :blk false; 2164 }; 2165 // the focusable owning the cell at (x, y); none for a covered cell. 2166 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2167 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2168 2169 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2170 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2171 open_link = null; 2172 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2173 2174 var new_tag: ?CellTag = null; 2175 if (cell_id) |id| { 2176 if (focus.children.get(id)) |child| { 2177 new_tag = switch (child.focus.kind) { 2178 .custom => |custom| CellTag.init(custom), 2179 else => .span, 2180 }; 2181 } 2182 } 2183 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2184 2185 if (new_tag) |t| { 2186 var style_buf: [192]u8 = undefined; 2187 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2188 } 2189 2190 open_tag = new_tag; 2191 cur_id = cell_id; 2192 cur_style = style; 2193 first = false; 2194 } 2195 2196 // an anchor can't nest in another, so a link tag's cells skip theirs 2197 const in_anchor = if (open_tag) |t| t == .a else false; 2198 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2199 if (!sameLink(link, open_link)) { 2200 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2201 if (link) |url| { 2202 try output.appendSlice(allocator, "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2203 try appendEscapedHtml(allocator, output, url); 2204 try output.appendSlice(allocator, "\">"); 2205 } 2206 open_link = link; 2207 } 2208 2209 if (covered_by_scroll) { 2210 try appendEscapedHtml(allocator, output, " "); 2211 } else if (cell.continuation) { 2212 // the wide rune to the left was emitted 2ch wide, covering this column 2213 } else if (cell.rune) |rune| { 2214 var encoded: [4]u8 = undefined; 2215 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2216 const rune_text = encoded[0..encoded_len]; 2217 // a double-width rune is pinned inside a 2ch span so the 2218 // fallback glyph's advance width can't shift the rest of the row 2219 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2220 if (wide) { 2221 try output.appendSlice(allocator, "<span class=\"w2\">"); 2222 try appendEscapedHtml(allocator, output, rune_text); 2223 try output.appendSlice(allocator, "</span>"); 2224 } else { 2225 try appendEscapedHtml(allocator, output, rune_text); 2226 } 2227 } else { 2228 try appendEscapedHtml(allocator, output, " "); 2229 } 2230 } 2231 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2232 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2233 try output.append(allocator, '\n'); 2234 } 2235 try output.appendSlice(allocator, "</div>"); 2236 2237 // native controls live in their panel, beside the replaceable cells. their 2238 // stable keys let JS update layout without recreating their DOM nodes, and 2239 // being actual descendants of a scroll gives them native movement/clipping. 2240 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2241 2242 // each child scroll becomes a natively-scrollable div positioned over its 2243 // viewport, holding its full content rendered recursively. 2244 for (direct.items) |id| { 2245 const child = focus.children.get(id) orelse continue; 2246 const info = child.focus.scroll orelse continue; 2247 const r = child.rect; 2248 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2249 // when that axis actually overflows. the other axis is clipped (hidden), 2250 // matching how the terminal Scroll handles its non-scrolling axis. 2251 const overflow = switch (info.direction) { 2252 .vert => "overflow-x:hidden;overflow-y:auto", 2253 .horiz => "overflow-x:auto;overflow-y:hidden", 2254 .both => "overflow:auto", 2255 }; 2256 // the id carries a content version so JS preserves the native scroll 2257 // position across re-renders of the same content but resets it when the 2258 // content is replaced — e.g. selecting a different commit. the widget's 2259 // scroll offset (in cells) rides along so JS can apply it when it has no 2260 // preserved position, letting a wasm-side scrollToRect (the files list 2261 // scrolling to its selected row on page load) reach the browser. 2262 var buf: [256]u8 = undefined; 2263 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 })); 2264 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2265 try output.appendSlice(allocator, "</div>"); 2266 } 2267 } 2268 2269 const form_prefix = "form:"; 2270 const form_id_prefix = "haxy-form-"; 2271 2272 fn formAction(focus: *const Focus) ?[]const u8 { 2273 return switch (focus.kind) { 2274 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2275 else => null, 2276 }; 2277 } 2278 2279 // find the form ancestor of a flattened focus-tree child. html's `form` 2280 // attribute then associates the control with that form without requiring the 2281 // form and control to share a DOM parent. 2282 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2283 var id = focus_id; 2284 while (root_focus.children.get(id)) |child| { 2285 const parent_id = child.parent_id; 2286 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2287 const parent = root_focus.children.get(parent_id) orelse return null; 2288 if (formAction(parent.focus) != null) return parent_id; 2289 id = parent_id; 2290 } 2291 return null; 2292 } 2293 2294 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2295 const form_id = formOwner(root_focus, focus_id) orelse return; 2296 var buf: [64]u8 = undefined; 2297 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2298 } 2299 2300 fn renderPanelControls( 2301 allocator: std.mem.Allocator, 2302 output: *std.ArrayList(u8), 2303 focus: *Focus, 2304 session: *ui.Session, 2305 root_focus: *Focus, 2306 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2307 ) !void { 2308 var iter = focus.children.iterator(); 2309 while (iter.next()) |entry| { 2310 const id = entry.key_ptr.*; 2311 if (excluded.contains(id)) continue; 2312 const child = entry.value_ptr.*; 2313 const r = child.rect; 2314 2315 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2316 2317 switch (child.focus.kind) { 2318 .text_input, .text_input_password, .text_area => { 2319 const ti = session.text_inputs.get(id) orelse continue; 2320 2321 const inner_left = r.x + 1; 2322 const inner_top = r.y + 1; 2323 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2324 const preserve = !ti.options.read_only; 2325 2326 if (child.focus.kind == .text_area) { 2327 const value = try ti.text(allocator); 2328 defer allocator.free(value); 2329 var id_buf: [128]u8 = undefined; 2330 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2331 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2332 try appendFormAttribute(allocator, output, root_focus, id); 2333 if (ti.options.name.len > 0) { 2334 try output.appendSlice(allocator, " name=\""); 2335 try appendEscapedHtml(allocator, output, ti.options.name); 2336 try output.append(allocator, '"'); 2337 } 2338 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2339 var pos_buf: [128]u8 = undefined; 2340 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 })); 2341 try appendEscapedHtml(allocator, output, value); 2342 try output.appendSlice(allocator, "</textarea>"); 2343 continue; 2344 } 2345 2346 var id_buf: [160]u8 = undefined; 2347 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 })); 2348 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2349 try appendFormAttribute(allocator, output, root_focus, id); 2350 if (ti.options.name.len > 0) { 2351 try output.appendSlice(allocator, " name=\""); 2352 try appendEscapedHtml(allocator, output, ti.options.name); 2353 try output.append(allocator, '"'); 2354 } 2355 if (child.focus.kind != .text_input_password) { 2356 const value = try ti.text(allocator); 2357 defer allocator.free(value); 2358 try output.appendSlice(allocator, " value=\""); 2359 try appendEscapedHtml(allocator, output, value); 2360 try output.append(allocator, '"'); 2361 } 2362 var pos_buf: [96]u8 = undefined; 2363 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 })); 2364 }, 2365 .custom => |custom| { 2366 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2367 if (formOwner(root_focus, id) == null) continue; 2368 var id_buf: [128]u8 = undefined; 2369 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2370 try appendFormAttribute(allocator, output, root_focus, id); 2371 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2372 try output.appendSlice(allocator, " formaction=\""); 2373 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2374 try output.append(allocator, '"'); 2375 } 2376 var pos_buf: [128]u8 = undefined; 2377 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 })); 2378 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2379 // an invisible native radio over the option, checked when the option is its row's selection 2380 const field = custom[ui.radio_prefix.len..]; 2381 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2382 const row = root_focus.children.get(child.parent_id) orelse continue; 2383 var id_buf: [128]u8 = undefined; 2384 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2385 try appendFormAttribute(allocator, output, root_focus, id); 2386 try output.appendSlice(allocator, " name=\""); 2387 try appendEscapedHtml(allocator, output, field[0..separator]); 2388 try output.appendSlice(allocator, "\" value=\""); 2389 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2390 try output.append(allocator, '"'); 2391 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2392 var pos_buf: [128]u8 = undefined; 2393 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 })); 2394 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2395 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2396 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2397 var id_buf: [128]u8 = undefined; 2398 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 })); 2399 } 2400 }, 2401 else => {}, 2402 } 2403 } 2404 } 2405 2406 // emit hidden form owners beside the rendered panels. their controls point 2407 // back here with the standard HTML `form` attribute. 2408 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2409 // the focus child map preserves insertion order, which matches the order 2410 // widgets were added in code 2411 var iter = root_focus.children.iterator(); 2412 while (iter.next()) |entry| { 2413 const child = entry.value_ptr.*; 2414 const action_url = formAction(child.focus) orelse continue; 2415 2416 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2417 var id_buf: [96]u8 = undefined; 2418 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2419 try appendEscapedHtml(allocator, output, action_url); 2420 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2421 } 2422 } 2423 2424 // the 16 ansi colors as the browser shows them (xterm's defaults) 2425 const ansi_palette = [16]Grid.Color.Rgb{ 2426 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2427 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2428 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2429 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2430 }; 2431 2432 // resolve any color to rgb: palette colors through the ansi table and the 2433 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2434 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2435 return switch (color) { 2436 .rgb => |c| c, 2437 .ansi => |a| ansi_palette[@intFromEnum(a)], 2438 .indexed => |n| if (n < 16) 2439 ansi_palette[n] 2440 else if (n < 232) blk: { 2441 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2442 const i = n - 16; 2443 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2444 } else blk: { 2445 const v: u8 = 8 + (n - 232) * 10; 2446 break :blk .{ .r = v, .g = v, .b = v }; 2447 }, 2448 }; 2449 } 2450 2451 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2452 // cell's style into `buf`, omitting whichever color is unset. an inverted 2453 // cell swaps the two, falling back to the page's --fg/--bg variables for 2454 // whichever side is unset. text attributes follow the colors. returns an 2455 // empty slice when nothing is set. 2456 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2457 if (style.eql(.{})) return buf[0..0]; 2458 const prefix = " style=\""; 2459 @memcpy(buf[0..prefix.len], prefix); 2460 var i: usize = prefix.len; 2461 const inverted = style.inverted; 2462 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2463 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2464 const decoration: []const u8 = if (style.underline and style.strikethrough) 2465 "text-decoration:underline line-through;" 2466 else if (style.underline) 2467 "text-decoration:underline;" 2468 else if (style.strikethrough) 2469 "text-decoration:line-through;" 2470 else 2471 ""; 2472 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2473 if (style.bold) "font-weight:bold;" else "", 2474 if (style.italic) "font-style:italic;" else "", 2475 decoration, 2476 if (style.dim) "opacity:.6;" else "", 2477 }) catch return buf[0..0]; 2478 i += attributes.len; 2479 if (i >= buf.len) return buf[0..0]; 2480 buf[i] = '"'; 2481 return buf[0 .. i + 1]; 2482 } 2483 2484 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2485 // the color is unset (nothing when both are). returns the new end, or null 2486 // when it doesn't fit. 2487 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2488 const s = if (color) |c| blk: { 2489 const v = colorRgb(c); 2490 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; 2491 } else if (fallback) |f| 2492 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2493 else 2494 return i; 2495 return i + s.len; 2496 } 2497 2498 // a cell's link as an href, when it's a web or mail url 2499 fn webLink(link: ?[]const u8) ?[]const u8 { 2500 const url = link orelse return null; 2501 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2502 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2503 } 2504 return null; 2505 } 2506 2507 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2508 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2509 return b == null; 2510 } 2511 2512 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2513 for (input) |ch| { 2514 switch (ch) { 2515 '&' => try out.appendSlice(allocator, "&amp;"), 2516 '<' => try out.appendSlice(allocator, "&lt;"), 2517 '>' => try out.appendSlice(allocator, "&gt;"), 2518 '"' => try out.appendSlice(allocator, "&quot;"), 2519 '\'' => try out.appendSlice(allocator, "&#39;"), 2520 else => try out.append(allocator, ch), 2521 } 2522 } 2523 } 2524 2525 // --- helpers -------------------------------------------------------------- 2526 2527 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2528 var iter = request.iterateHeaders(); 2529 while (iter.next()) |header| { 2530 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2531 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2532 while (pairs.next()) |pair| { 2533 const trimmed = std.mem.trim(u8, pair, " \t"); 2534 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2535 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2536 return trimmed[eq + 1 ..]; 2537 } 2538 } 2539 } 2540 return null; 2541 } 2542 2543 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2544 var iter = std.mem.splitScalar(u8, body, '&'); 2545 while (iter.next()) |pair| { 2546 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2547 if (std.mem.eql(u8, pair[0..eq], key)) { 2548 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2549 } 2550 } 2551 return null; 2552 } 2553 2554 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2555 var buffer: [256]u8 = undefined; 2556 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2557 } 2558 2559 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2560 var out: std.ArrayList(u8) = .empty; 2561 errdefer out.deinit(allocator); 2562 var i: usize = 0; 2563 while (i < encoded.len) : (i += 1) { 2564 switch (encoded[i]) { 2565 '+' => try out.append(allocator, ' '), 2566 '%' => { 2567 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2568 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2569 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2570 try out.append(allocator, hi * 16 + lo); 2571 i += 2; 2572 }, 2573 else => try out.append(allocator, encoded[i]), 2574 } 2575 } 2576 return try out.toOwnedSlice(allocator); 2577 } 2578 2579 // disk-backed web session store. each login mints a random, opaque token 2580 // (not the user's id) that is stored as a file named by the token hex, whose 2581 // contents are the raw user_id bytes. authenticating a request is a lookup of 2582 // the cookie's token; logout deletes the file, revoking the session. there is 2583 // deliberately no expiry — a session lives until logout. form failures use 2584 // files in the flash subdirectory that the redirected GET consumes. the 2585 // directory is cleared whenever the server starts. 2586 pub const SessionStore = struct { 2587 io: std.Io, 2588 dir: std.Io.Dir, 2589 flash_dir: std.Io.Dir, 2590 auto_login: ?[token_hex_len]u8, 2591 2592 pub const token_hex_len = evt.event_id_size * 2; 2593 2594 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2595 try data_dir.createDirPath(io, "sessions"); 2596 const dir = try data_dir.openDir(io, "sessions", .{}); 2597 errdefer dir.close(io); 2598 try dir.deleteTree(io, "flash"); 2599 try dir.createDirPath(io, "flash"); 2600 const flash_dir = try dir.openDir(io, "flash", .{}); 2601 errdefer flash_dir.close(io); 2602 const auto_login = blk: { 2603 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2604 defer file.close(io); 2605 var token: [token_hex_len]u8 = undefined; 2606 var storage: [token_hex_len]u8 = undefined; 2607 var reader = file.reader(io, &storage); 2608 reader.interface.readSliceAll(&token) catch break :blk null; 2609 break :blk token; 2610 }; 2611 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2612 } 2613 2614 pub fn deinit(self: SessionStore) void { 2615 self.flash_dir.close(self.io); 2616 self.dir.close(self.io); 2617 } 2618 2619 // mint a new session for user_id, returning the token hex to set as the 2620 // cookie value. 2621 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2622 var token: [evt.event_id_size]u8 = undefined; 2623 self.io.random(&token); 2624 const token_hex = std.fmt.bytesToHex(token, .lower); 2625 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2626 defer file.close(self.io); 2627 try file.writeStreamingAll(self.io, user_id); 2628 return token_hex; 2629 } 2630 2631 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2632 var token: [evt.event_id_size]u8 = undefined; 2633 self.io.random(&token); 2634 const token_hex = std.fmt.bytesToHex(token, .lower); 2635 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2636 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2637 defer file.close(self.io); 2638 2639 var json: std.Io.Writer.Allocating = .init(allocator); 2640 defer json.deinit(); 2641 try std.json.Stringify.value(value, .{}, &json.writer); 2642 try file.writeStreamingAll(self.io, json.written()); 2643 return token_hex; 2644 } 2645 2646 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2647 if (!isToken(token_hex)) return null; 2648 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2649 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2650 defer file.close(self.io); 2651 2652 var storage: [4096]u8 = undefined; 2653 var reader = file.reader(self.io, &storage); 2654 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2655 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2656 } 2657 2658 // resolve a cookie's token to its user_id. returns false (logged out) for a 2659 // missing, malformed, or unknown token. 2660 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2661 if (!isToken(token_hex)) return false; 2662 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2663 defer file.close(self.io); 2664 var storage: [evt.event_id_size]u8 = undefined; 2665 var file_reader = file.reader(self.io, &storage); 2666 file_reader.interface.readSliceAll(out) catch return false; 2667 return true; 2668 } 2669 2670 // revoke a session. a no-op for a missing or malformed token. 2671 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2672 if (!isToken(token_hex)) return; 2673 self.dir.deleteFile(self.io, token_hex) catch {}; 2674 } 2675 2676 // leave `token_hex`'s session for visitors arriving without one. only the 2677 // `try` fixture writes one. the name can't collide with a session token. 2678 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2679 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2680 defer file.close(self.io); 2681 try file.writeStreamingAll(self.io, token_hex); 2682 } 2683 2684 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2685 out.* = self.auto_login orelse return false; 2686 return true; 2687 } 2688 2689 const auto_login_name = "auto-login"; 2690 2691 // a token is exactly token_hex_len hex chars. validating before using the 2692 // value as a path keeps attacker-supplied cookies from escaping the 2693 // sessions dir (e.g. via "/" or ".." bytes). 2694 fn isToken(token_hex: []const u8) bool { 2695 if (token_hex.len != token_hex_len) return false; 2696 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2697 return true; 2698 } 2699 }; 2700