╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭af907925..╮ af907925.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (670) 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 │ ╰─────────────────────────────────╯
2649 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2650 var id_buf: [128]u8 = undefined; 2651 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 })); 2652 } 2653 }, 2654 else => {}, 2655 } 2656 } 2657 } 2658 2659 // emit hidden form owners beside the rendered panels. their controls point 2660 // back here with the standard HTML `form` attribute. 2661 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2662 // the focus child map preserves insertion order, which matches the order 2663 // widgets were added in code 2664 var iter = root_focus.children.iterator(); 2665 while (iter.next()) |entry| { 2666 const child = entry.value_ptr.*; 2667 const action_url = formAction(child.focus) orelse continue; 2668 2669 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2670 var id_buf: [96]u8 = undefined; 2671 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2672 try appendEscapedHtml(allocator, output, action_url); 2673 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2674 } 2675 } 2676 2677 // the 16 ansi colors as the browser shows them (xterm's defaults) 2678 const ansi_palette = [16]Grid.Color.Rgb{ 2679 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2680 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2681 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2682 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2683 }; 2684 2685 // resolve any color to rgb: palette colors through the ansi table and the 2686 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2687 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2688 return switch (color) { 2689 .rgb => |c| c, 2690 .ansi => |a| ansi_palette[@backingInt(a)], 2691 .indexed => |n| if (n < 16) 2692 ansi_palette[n] 2693 else if (n < 232) blk: { 2694 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2695 const i = n - 16; 2696 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2697 } else blk: { 2698 const v: u8 = 8 + (n - 232) * 10; 2699 break :blk .{ .r = v, .g = v, .b = v }; 2700 }, 2701 }; 2702 } 2703 2704 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2705 // cell's style into `buf`, omitting whichever color is unset. an inverted 2706 // cell swaps the two, falling back to the page's --fg/--bg variables for 2707 // whichever side is unset. text attributes follow the colors. returns an 2708 // empty slice when nothing is set. 2709 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2710 if (style.eql(.{})) return buf[0..0]; 2711 const prefix = " style=\""; 2712 @memcpy(buf[0..prefix.len], prefix); 2713 var i: usize = prefix.len; 2714 const inverted = style.inverted; 2715 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2716 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2717 const decoration: []const u8 = if (style.underline and style.strikethrough) 2718 "text-decoration:underline line-through;" 2719 else if (style.underline) 2720 "text-decoration:underline;" 2721 else if (style.strikethrough) 2722 "text-decoration:line-through;" 2723 else 2724 ""; 2725 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2726 if (style.bold) "font-weight:bold;" else "", 2727 if (style.italic) "font-style:italic;" else "", 2728 decoration, 2729 if (style.dim) "opacity:.6;" else "", 2730 }) catch return buf[0..0]; 2731 i += attributes.len; 2732 if (i >= buf.len) return buf[0..0]; 2733 buf[i] = '"'; 2734 return buf[0 .. i + 1]; 2735 } 2736 2737 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2738 // the color is unset (nothing when both are). returns the new end, or null 2739 // when it doesn't fit. 2740 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2741 const s = if (color) |c| blk: { 2742 const v = colorRgb(c); 2743 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; 2744 } else if (fallback) |f| 2745 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2746 else 2747 return i; 2748 return i + s.len; 2749 } 2750 2751 // a cell's link as an href, when it's a page path or a web or mail url 2752 fn webLink(link: ?[]const u8) ?[]const u8 { 2753 const url = link orelse return null; 2754 // a page path, not a protocol-relative url 2755 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2756 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2757 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2758 } 2759 return null; 2760 } 2761 2762 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2763 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2764 return b == null; 2765 } 2766 2767 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2768 for (input) |ch| { 2769 switch (ch) { 2770 '&' => try out.appendSlice(allocator, "&amp;"), 2771 '<' => try out.appendSlice(allocator, "&lt;"), 2772 '>' => try out.appendSlice(allocator, "&gt;"), 2773 '"' => try out.appendSlice(allocator, "&quot;"), 2774 '\'' => try out.appendSlice(allocator, "&#39;"), 2775 else => try out.append(allocator, ch), 2776 } 2777 } 2778 } 2779 2780 // --- helpers -------------------------------------------------------------- 2781 2782 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2783 var iter = request.iterateHeaders(); 2784 while (iter.next()) |header| { 2785 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2786 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2787 while (pairs.next()) |pair| { 2788 const trimmed = std.mem.trim(u8, pair, " \t"); 2789 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2790 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2791 return trimmed[eq + 1 ..]; 2792 } 2793 } 2794 } 2795 return null; 2796 } 2797 2798 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2799 var iter = std.mem.splitScalar(u8, body, '&'); 2800 while (iter.next()) |pair| { 2801 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2802 if (std.mem.eql(u8, pair[0..eq], key)) { 2803 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2804 } 2805 } 2806 return null; 2807 } 2808 2809 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2810 var buffer: [256]u8 = undefined; 2811 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2812 } 2813 2814 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2815 var out: std.ArrayList(u8) = .empty; 2816 errdefer out.deinit(allocator); 2817 var i: usize = 0; 2818 while (i < encoded.len) : (i += 1) { 2819 switch (encoded[i]) { 2820 '+' => try out.append(allocator, ' '), 2821 '%' => { 2822 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2823 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2824 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2825 try out.append(allocator, hi * 16 + lo); 2826 i += 2; 2827 }, 2828 else => try out.append(allocator, encoded[i]), 2829 } 2830 } 2831 return try out.toOwnedSlice(allocator); 2832 } 2833 2834 // disk-backed web session store. each login mints a random, opaque token 2835 // (not the user's id) that is stored as a file named by the token hex, whose 2836 // contents are the raw user_id bytes. authenticating a request is a lookup of 2837 // the cookie's token; logout deletes the file, revoking the session. there is 2838 // deliberately no expiry — a session lives until logout. form failures use 2839 // files in the flash subdirectory that the redirected GET consumes. the 2840 // directory is cleared whenever the server starts. 2841 pub const SessionStore = struct { 2842 io: std.Io, 2843 dir: std.Io.Dir, 2844 flash_dir: std.Io.Dir, 2845 auto_login: ?[token_hex_len]u8, 2846 2847 pub const token_hex_len = evt.event_id_size * 2; 2848 2849 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2850 try data_dir.createDirPath(io, "sessions"); 2851 const dir = try data_dir.openDir(io, "sessions", .{}); 2852 errdefer dir.close(io); 2853 try dir.deleteTree(io, "flash"); 2854 try dir.createDirPath(io, "flash"); 2855 const flash_dir = try dir.openDir(io, "flash", .{}); 2856 errdefer flash_dir.close(io); 2857 const auto_login = blk: { 2858 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2859 defer file.close(io); 2860 var token: [token_hex_len]u8 = undefined; 2861 var storage: [token_hex_len]u8 = undefined; 2862 var reader = file.reader(io, &storage); 2863 reader.interface.readSliceAll(&token) catch break :blk null; 2864 break :blk token; 2865 }; 2866 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2867 } 2868 2869 pub fn deinit(self: SessionStore) void { 2870 self.flash_dir.close(self.io); 2871 self.dir.close(self.io); 2872 } 2873 2874 // mint a new session for user_id, returning the token hex to set as the 2875 // cookie value. 2876 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2877 var token: [evt.event_id_size]u8 = undefined; 2878 self.io.random(&token); 2879 const token_hex = std.fmt.bytesToHex(token, .lower); 2880 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2881 defer file.close(self.io); 2882 try file.writeStreamingAll(self.io, user_id); 2883 return token_hex; 2884 } 2885 2886 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2887 var token: [evt.event_id_size]u8 = undefined; 2888 self.io.random(&token); 2889 const token_hex = std.fmt.bytesToHex(token, .lower); 2890 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2891 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2892 defer file.close(self.io); 2893 2894 var json: std.Io.Writer.Allocating = .init(allocator); 2895 defer json.deinit(); 2896 try std.json.Stringify.value(value, .{}, &json.writer); 2897 try file.writeStreamingAll(self.io, json.written()); 2898 return token_hex; 2899 } 2900 2901 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2902 if (!isToken(token_hex)) return null; 2903 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2904 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2905 defer file.close(self.io); 2906 2907 var storage: [4096]u8 = undefined; 2908 var reader = file.reader(self.io, &storage); 2909 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2910 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2911 } 2912 2913 // resolve a cookie's token to its user_id. returns false (logged out) for a 2914 // missing, malformed, or unknown token. 2915 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2916 if (!isToken(token_hex)) return false; 2917 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2918 defer file.close(self.io); 2919 var storage: [evt.event_id_size]u8 = undefined; 2920 var file_reader = file.reader(self.io, &storage); 2921 file_reader.interface.readSliceAll(out) catch return false; 2922 return true; 2923 } 2924 2925 // revoke a session. a no-op for a missing or malformed token. 2926 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2927 if (!isToken(token_hex)) return; 2928 self.dir.deleteFile(self.io, token_hex) catch {}; 2929 } 2930 2931 // leave `token_hex`'s session for visitors arriving without one. only the 2932 // `try` fixture writes one. the name can't collide with a session token. 2933 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2934 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2935 defer file.close(self.io); 2936 try file.writeStreamingAll(self.io, token_hex); 2937 } 2938 2939 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2940 out.* = self.auto_login orelse return false; 2941 return true; 2942 } 2943 2944 const auto_login_name = "auto-login"; 2945 2946 // a token is exactly token_hex_len hex chars. validating before using the 2947 // value as a path keeps attacker-supplied cookies from escaping the 2948 // sessions dir (e.g. via "/" or ".." bytes). 2949 fn isToken(token_hex: []const u8) bool { 2950 if (token_hex.len != token_hex_len) return false; 2951 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2952 return true; 2953 } 2954 }; 2955