╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭7ddb9128..╮ 7ddb9128.. haxy: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues patches new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (690) 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 │ ╰─────────────────────────────────╯
2802 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2803 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2804 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2805 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2806 }; 2807 2808 // resolve any color to rgb: palette colors through the ansi table and the 2809 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2810 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2811 return switch (color) { 2812 .rgb => |c| c, 2813 .ansi => |a| ansi_palette[@backingInt(a)], 2814 .indexed => |n| if (n < 16) 2815 ansi_palette[n] 2816 else if (n < 232) blk: { 2817 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2818 const i = n - 16; 2819 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2820 } else blk: { 2821 const v: u8 = 8 + (n - 232) * 10; 2822 break :blk .{ .r = v, .g = v, .b = v }; 2823 }, 2824 }; 2825 } 2826 2827 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2828 // cell's style into `buf`, omitting whichever color is unset. an inverted 2829 // cell swaps the two, falling back to the page's --fg/--bg variables for 2830 // whichever side is unset. text attributes follow the colors. returns an 2831 // empty slice when nothing is set. 2832 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2833 if (style.eql(.{})) return buf[0..0]; 2834 const prefix = " style=\""; 2835 @memcpy(buf[0..prefix.len], prefix); 2836 var i: usize = prefix.len; 2837 const inverted = style.inverted; 2838 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2839 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2840 const decoration: []const u8 = if (style.underline and style.strikethrough) 2841 "text-decoration:underline line-through;" 2842 else if (style.underline) 2843 "text-decoration:underline;" 2844 else if (style.strikethrough) 2845 "text-decoration:line-through;" 2846 else 2847 ""; 2848 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2849 if (style.bold) "font-weight:bold;" else "", 2850 if (style.italic) "font-style:italic;" else "", 2851 decoration, 2852 if (style.dim) "opacity:.6;" else "", 2853 }) catch return buf[0..0]; 2854 i += attributes.len; 2855 if (i >= buf.len) return buf[0..0]; 2856 buf[i] = '"'; 2857 return buf[0 .. i + 1]; 2858 } 2859 2860 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2861 // the color is unset (nothing when both are). returns the new end, or null 2862 // when it doesn't fit. 2863 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2864 const s = if (color) |c| blk: { 2865 const v = colorRgb(c); 2866 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; 2867 } else if (fallback) |f| 2868 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2869 else 2870 return i; 2871 return i + s.len; 2872 } 2873 2874 // a cell's link as an href, when it's a page path or a web or mail url 2875 fn webLink(link: ?[]const u8) ?[]const u8 { 2876 const url = link orelse return null; 2877 // a page path, not a protocol-relative url 2878 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2879 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2880 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2881 } 2882 return null; 2883 } 2884 2885 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2886 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2887 return b == null; 2888 } 2889 2890 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2891 for (input) |ch| { 2892 switch (ch) { 2893 '&' => try out.appendSlice(allocator, "&amp;"), 2894 '<' => try out.appendSlice(allocator, "&lt;"), 2895 '>' => try out.appendSlice(allocator, "&gt;"), 2896 '"' => try out.appendSlice(allocator, "&quot;"), 2897 '\'' => try out.appendSlice(allocator, "&#39;"), 2898 else => try out.append(allocator, ch), 2899 } 2900 } 2901 } 2902 2903 // --- helpers -------------------------------------------------------------- 2904 2905 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2906 var iter = request.iterateHeaders(); 2907 while (iter.next()) |header| { 2908 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2909 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2910 while (pairs.next()) |pair| { 2911 const trimmed = std.mem.trim(u8, pair, " \t"); 2912 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2913 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2914 return trimmed[eq + 1 ..]; 2915 } 2916 } 2917 } 2918 return null; 2919 } 2920 2921 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2922 var iter = std.mem.splitScalar(u8, body, '&'); 2923 while (iter.next()) |pair| { 2924 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2925 if (std.mem.eql(u8, pair[0..eq], key)) { 2926 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2927 } 2928 } 2929 return null; 2930 } 2931 2932 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2933 var buffer: [256]u8 = undefined; 2934 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2935 } 2936 2937 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2938 var out: std.ArrayList(u8) = .empty; 2939 errdefer out.deinit(allocator); 2940 var i: usize = 0; 2941 while (i < encoded.len) : (i += 1) { 2942 switch (encoded[i]) { 2943 '+' => try out.append(allocator, ' '), 2944 '%' => { 2945 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2946 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2947 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2948 try out.append(allocator, hi * 16 + lo); 2949 i += 2; 2950 }, 2951 else => try out.append(allocator, encoded[i]), 2952 } 2953 } 2954 return try out.toOwnedSlice(allocator); 2955 } 2956 2957 // disk-backed web session store. each login mints a random, opaque token 2958 // (not the user's id) that is stored as a file named by the token hex, whose 2959 // contents are the raw user_id bytes. authenticating a request is a lookup of 2960 // the cookie's token; logout deletes the file, revoking the session. there is 2961 // deliberately no expiry — a session lives until logout. form failures use 2962 // files in the flash subdirectory that the redirected GET consumes. the 2963 // directory is cleared whenever the server starts. 2964 pub const SessionStore = struct { 2965 io: std.Io, 2966 dir: std.Io.Dir, 2967 flash_dir: std.Io.Dir, 2968 auto_login: ?[token_hex_len]u8, 2969 2970 pub const token_hex_len = evt.event_id_size * 2; 2971 2972 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2973 try data_dir.createDirPath(io, "sessions"); 2974 const dir = try data_dir.openDir(io, "sessions", .{}); 2975 errdefer dir.close(io); 2976 try dir.deleteTree(io, "flash"); 2977 try dir.createDirPath(io, "flash"); 2978 const flash_dir = try dir.openDir(io, "flash", .{}); 2979 errdefer flash_dir.close(io); 2980 const auto_login = blk: { 2981 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2982 defer file.close(io); 2983 var token: [token_hex_len]u8 = undefined; 2984 var storage: [token_hex_len]u8 = undefined; 2985 var reader = file.reader(io, &storage); 2986 reader.interface.readSliceAll(&token) catch break :blk null; 2987 break :blk token; 2988 }; 2989 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2990 } 2991 2992 pub fn deinit(self: SessionStore) void { 2993 self.flash_dir.close(self.io); 2994 self.dir.close(self.io); 2995 } 2996 2997 // mint a new session for user_id, returning the token hex to set as the 2998 // cookie value. 2999 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 3000 var token: [evt.event_id_size]u8 = undefined; 3001 self.io.random(&token); 3002 const token_hex = std.fmt.bytesToHex(token, .lower); 3003 const file = try self.dir.createFile(self.io, &token_hex, .{}); 3004 defer file.close(self.io); 3005 try file.writeStreamingAll(self.io, user_id); 3006 return token_hex; 3007 } 3008 3009 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 3010 var token: [evt.event_id_size]u8 = undefined; 3011 self.io.random(&token); 3012 const token_hex = std.fmt.bytesToHex(token, .lower); 3013 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 3014 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 3015 defer file.close(self.io); 3016 3017 var json: std.Io.Writer.Allocating = .init(allocator); 3018 defer json.deinit(); 3019 try std.json.Stringify.value(value, .{}, &json.writer); 3020 try file.writeStreamingAll(self.io, json.written()); 3021 return token_hex; 3022 } 3023 3024 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 3025 if (!isToken(token_hex)) return null; 3026 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 3027 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 3028 defer file.close(self.io); 3029 3030 var storage: [4096]u8 = undefined; 3031 var reader = file.reader(self.io, &storage); 3032 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 3033 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 3034 } 3035 3036 // resolve a cookie's token to its user_id. returns false (logged out) for a 3037 // missing, malformed, or unknown token. 3038 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 3039 if (!isToken(token_hex)) return false; 3040 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 3041 defer file.close(self.io); 3042 var storage: [evt.event_id_size]u8 = undefined; 3043 var file_reader = file.reader(self.io, &storage); 3044 file_reader.interface.readSliceAll(out) catch return false; 3045 return true; 3046 } 3047 3048 // revoke a session. a no-op for a missing or malformed token. 3049 pub fn remove(self: SessionStore, token_hex: []const u8) void { 3050 if (!isToken(token_hex)) return; 3051 self.dir.deleteFile(self.io, token_hex) catch {}; 3052 } 3053 3054 // leave `token_hex`'s session for visitors arriving without one. only the 3055 // `try` fixture writes one. the name can't collide with a session token. 3056 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 3057 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 3058 defer file.close(self.io); 3059 try file.writeStreamingAll(self.io, token_hex); 3060 } 3061 3062 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 3063 out.* = self.auto_login orelse return false; 3064 return true; 3065 } 3066 3067 const auto_login_name = "auto-login"; 3068 3069 // a token is exactly token_hex_len hex chars. validating before using the 3070 // value as a path keeps attacker-supplied cookies from escaping the 3071 // sessions dir (e.g. via "/" or ".." bytes). 3072 fn isToken(token_hex: []const u8) bool { 3073 if (token_hex.len != token_hex_len) return false; 3074 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 3075 return true; 3076 } 3077 }; 3078