╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭9cd00aac..╮ 9cd00aac.. haxy: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues patches new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (699) 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 notify.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 │ ╰─────────────────────────────────╯
2769 try output.appendSlice(allocator, " value=\""); 2770 try appendEscapedHtml(allocator, output, value); 2771 try output.append(allocator, '"'); 2772 } 2773 var pos_buf: [96]u8 = undefined; 2774 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 })); 2775 }, 2776 .custom => |custom| { 2777 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2778 if (formOwner(root_focus, id) == null) continue; 2779 var id_buf: [128]u8 = undefined; 2780 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2781 try appendFormAttribute(allocator, output, root_focus, id); 2782 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2783 try output.appendSlice(allocator, " formaction=\""); 2784 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2785 try output.append(allocator, '"'); 2786 } 2787 var pos_buf: [128]u8 = undefined; 2788 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 })); 2789 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2790 // an invisible native radio over the option, checked when the option is its row's selection 2791 const field = custom[ui.radio_prefix.len..]; 2792 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2793 const row = root_focus.children.get(child.parent_id) orelse continue; 2794 var id_buf: [128]u8 = undefined; 2795 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2796 try appendFormAttribute(allocator, output, root_focus, id); 2797 try output.appendSlice(allocator, " name=\""); 2798 try appendEscapedHtml(allocator, output, field[0..separator]); 2799 try output.appendSlice(allocator, "\" value=\""); 2800 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2801 try output.append(allocator, '"'); 2802 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2803 var pos_buf: [128]u8 = undefined; 2804 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 })); 2805 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2806 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2807 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2808 var id_buf: [128]u8 = undefined; 2809 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 })); 2810 } 2811 }, 2812 else => {}, 2813 } 2814 } 2815 } 2816 2817 // emit hidden form owners beside the rendered panels. their controls point 2818 // back here with the standard HTML `form` attribute. 2819 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2820 // the focus child map preserves insertion order, which matches the order 2821 // widgets were added in code 2822 var iter = root_focus.children.iterator(); 2823 while (iter.next()) |entry| { 2824 const child = entry.value_ptr.*; 2825 const action_url = formAction(child.focus) orelse continue; 2826 2827 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2828 var id_buf: [96]u8 = undefined; 2829 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2830 try appendEscapedHtml(allocator, output, action_url); 2831 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2832 } 2833 } 2834 2835 // the 16 ansi colors as the browser shows them (xterm's defaults) 2836 const ansi_palette = [16]Grid.Color.Rgb{ 2837 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2838 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2839 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2840 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2841 }; 2842 2843 // resolve any color to rgb: palette colors through the ansi table and the 2844 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2845 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2846 return switch (color) { 2847 .rgb => |c| c, 2848 .ansi => |a| ansi_palette[@backingInt(a)], 2849 .indexed => |n| if (n < 16) 2850 ansi_palette[n] 2851 else if (n < 232) blk: { 2852 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2853 const i = n - 16; 2854 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2855 } else blk: { 2856 const v: u8 = 8 + (n - 232) * 10; 2857 break :blk .{ .r = v, .g = v, .b = v }; 2858 }, 2859 }; 2860 } 2861 2862 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2863 // cell's style into `buf`, omitting whichever color is unset. an inverted 2864 // cell swaps the two, falling back to the page's --fg/--bg variables for 2865 // whichever side is unset. text attributes follow the colors. returns an 2866 // empty slice when nothing is set. 2867 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2868 if (style.eql(.{})) return buf[0..0]; 2869 const prefix = " style=\""; 2870 @memcpy(buf[0..prefix.len], prefix); 2871 var i: usize = prefix.len; 2872 const inverted = style.inverted; 2873 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2874 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2875 const decoration: []const u8 = if (style.underline and style.strikethrough) 2876 "text-decoration:underline line-through;" 2877 else if (style.underline) 2878 "text-decoration:underline;" 2879 else if (style.strikethrough) 2880 "text-decoration:line-through;" 2881 else 2882 ""; 2883 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2884 if (style.bold) "font-weight:bold;" else "", 2885 if (style.italic) "font-style:italic;" else "", 2886 decoration, 2887 if (style.dim) "opacity:.6;" else "", 2888 }) catch return buf[0..0]; 2889 i += attributes.len; 2890 if (i >= buf.len) return buf[0..0]; 2891 buf[i] = '"'; 2892 return buf[0 .. i + 1]; 2893 } 2894 2895 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2896 // the color is unset (nothing when both are). returns the new end, or null 2897 // when it doesn't fit. 2898 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2899 const s = if (color) |c| blk: { 2900 const v = colorRgb(c); 2901 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; 2902 } else if (fallback) |f| 2903 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2904 else 2905 return i; 2906 return i + s.len; 2907 } 2908 2909 // a cell's link as an href, when it's a page path or a web or mail url 2910 fn webLink(link: ?[]const u8) ?[]const u8 { 2911 const url = link orelse return null; 2912 // a page path, not a protocol-relative url 2913 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2914 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2915 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2916 } 2917 return null; 2918 } 2919 2920 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2921 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2922 return b == null; 2923 } 2924 2925 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2926 for (input) |ch| { 2927 switch (ch) { 2928 '&' => try out.appendSlice(allocator, "&amp;"), 2929 '<' => try out.appendSlice(allocator, "&lt;"), 2930 '>' => try out.appendSlice(allocator, "&gt;"), 2931 '"' => try out.appendSlice(allocator, "&quot;"), 2932 '\'' => try out.appendSlice(allocator, "&#39;"), 2933 else => try out.append(allocator, ch), 2934 } 2935 } 2936 } 2937 2938 // --- helpers -------------------------------------------------------------- 2939 2940 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2941 var iter = request.iterateHeaders(); 2942 while (iter.next()) |header| { 2943 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2944 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2945 while (pairs.next()) |pair| { 2946 const trimmed = std.mem.trim(u8, pair, " \t"); 2947 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2948 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2949 return trimmed[eq + 1 ..]; 2950 } 2951 } 2952 } 2953 return null; 2954 } 2955 2956 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2957 var iter = std.mem.splitScalar(u8, body, '&'); 2958 while (iter.next()) |pair| { 2959 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2960 if (std.mem.eql(u8, pair[0..eq], key)) { 2961 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2962 } 2963 } 2964 return null; 2965 } 2966 2967 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2968 var buffer: [256]u8 = undefined; 2969 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2970 } 2971 2972 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2973 var out: std.ArrayList(u8) = .empty; 2974 errdefer out.deinit(allocator); 2975 var i: usize = 0; 2976 while (i < encoded.len) : (i += 1) { 2977 switch (encoded[i]) { 2978 '+' => try out.append(allocator, ' '), 2979 '%' => { 2980 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2981 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2982 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2983 try out.append(allocator, hi * 16 + lo); 2984 i += 2; 2985 }, 2986 else => try out.append(allocator, encoded[i]), 2987 } 2988 } 2989 return try out.toOwnedSlice(allocator); 2990 } 2991 2992 // disk-backed web session store. each login mints a random, opaque token 2993 // (not the user's id) that is stored as a file named by the token hex, whose 2994 // contents are the raw user_id bytes. authenticating a request is a lookup of 2995 // the cookie's token; logout deletes the file, revoking the session. there is 2996 // deliberately no expiry — a session lives until logout. form failures use 2997 // files in the flash subdirectory that the redirected GET consumes. the 2998 // directory is cleared whenever the server starts. 2999 pub const SessionStore = struct { 3000 io: std.Io, 3001 dir: std.Io.Dir, 3002 flash_dir: std.Io.Dir, 3003 auto_login: ?[token_hex_len]u8, 3004 3005 pub const token_hex_len = evt.event_id_size * 2; 3006 3007 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 3008 try data_dir.createDirPath(io, "sessions"); 3009 const dir = try data_dir.openDir(io, "sessions", .{}); 3010 errdefer dir.close(io); 3011 try dir.deleteTree(io, "flash"); 3012 try dir.createDirPath(io, "flash"); 3013 const flash_dir = try dir.openDir(io, "flash", .{}); 3014 errdefer flash_dir.close(io); 3015 const auto_login = blk: { 3016 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 3017 defer file.close(io); 3018 var token: [token_hex_len]u8 = undefined; 3019 var storage: [token_hex_len]u8 = undefined; 3020 var reader = file.reader(io, &storage); 3021 reader.interface.readSliceAll(&token) catch break :blk null; 3022 break :blk token; 3023 }; 3024 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 3025 } 3026 3027 pub fn deinit(self: SessionStore) void { 3028 self.flash_dir.close(self.io); 3029 self.dir.close(self.io); 3030 } 3031 3032 // mint a new session for user_id, returning the token hex to set as the 3033 // cookie value. 3034 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 3035 var token: [evt.event_id_size]u8 = undefined; 3036 self.io.random(&token); 3037 const token_hex = std.fmt.bytesToHex(token, .lower); 3038 const file = try self.dir.createFile(self.io, &token_hex, .{}); 3039 defer file.close(self.io); 3040 try file.writeStreamingAll(self.io, user_id); 3041 return token_hex; 3042 } 3043 3044 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 3045 var token: [evt.event_id_size]u8 = undefined; 3046 self.io.random(&token); 3047 const token_hex = std.fmt.bytesToHex(token, .lower); 3048 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 3049 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 3050 defer file.close(self.io); 3051 3052 var json: std.Io.Writer.Allocating = .init(allocator); 3053 defer json.deinit(); 3054 try std.json.Stringify.value(value, .{}, &json.writer); 3055 try file.writeStreamingAll(self.io, json.written()); 3056 return token_hex; 3057 } 3058 3059 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 3060 if (!isToken(token_hex)) return null; 3061 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 3062 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 3063 defer file.close(self.io); 3064 3065 var storage: [4096]u8 = undefined; 3066 var reader = file.reader(self.io, &storage); 3067 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 3068 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 3069 } 3070 3071 // resolve a cookie's token to its user_id. returns false (logged out) for a 3072 // missing, malformed, or unknown token. 3073 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 3074 if (!isToken(token_hex)) return false; 3075 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 3076 defer file.close(self.io); 3077 var storage: [evt.event_id_size]u8 = undefined; 3078 var file_reader = file.reader(self.io, &storage); 3079 file_reader.interface.readSliceAll(out) catch return false; 3080 return true; 3081 } 3082 3083 // revoke a session. a no-op for a missing or malformed token. 3084 pub fn remove(self: SessionStore, token_hex: []const u8) void { 3085 if (!isToken(token_hex)) return; 3086 self.dir.deleteFile(self.io, token_hex) catch {}; 3087 } 3088 3089 // leave `token_hex`'s session for visitors arriving without one. only the 3090 // `try` fixture writes one. the name can't collide with a session token. 3091 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 3092 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 3093 defer file.close(self.io); 3094 try file.writeStreamingAll(self.io, token_hex); 3095 } 3096 3097 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 3098 out.* = self.auto_login orelse return false; 3099 return true; 3100 } 3101 3102 const auto_login_name = "auto-login"; 3103 3104 // a token is exactly token_hex_len hex chars. validating before using the 3105 // value as a path keeps attacker-supplied cookies from escaping the 3106 // sessions dir (e.g. via "/" or ".." bytes). 3107 fn isToken(token_hex: []const u8) bool { 3108 if (token_hex.len != token_hex_len) return false; 3109 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 3110 return true; 3111 } 3112 }; 3113