╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭03aedad0..╮ 03aedad0.. haxy: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues patches new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (701) 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 │ ╰─────────────────────────────────╯
2768 session: *ui.Session, 2769 root_focus: *Focus, 2770 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2771 ) !void { 2772 var iter = focus.children.iterator(); 2773 while (iter.next()) |entry| { 2774 const id = entry.key_ptr.*; 2775 if (excluded.contains(id)) continue; 2776 const child = entry.value_ptr.*; 2777 const r = child.rect; 2778 2779 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2780 2781 switch (child.focus.kind) { 2782 .text_input, .text_input_password, .text_area => { 2783 const ti = session.text_inputs.get(id) orelse continue; 2784 2785 const inner_left = r.x + 1; 2786 const inner_top = r.y + 1; 2787 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2788 const preserve = !ti.options.read_only; 2789 2790 if (child.focus.kind == .text_area) { 2791 const value = try ti.text(allocator); 2792 defer allocator.free(value); 2793 var id_buf: [128]u8 = undefined; 2794 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2795 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2796 try appendFormAttribute(allocator, output, root_focus, id); 2797 if (ti.options.name.len > 0) { 2798 try output.appendSlice(allocator, " name=\""); 2799 try appendEscapedHtml(allocator, output, ti.options.name); 2800 try output.append(allocator, '"'); 2801 } 2802 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2803 var pos_buf: [128]u8 = undefined; 2804 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 })); 2805 try appendEscapedHtml(allocator, output, value); 2806 try output.appendSlice(allocator, "</textarea>"); 2807 continue; 2808 } 2809 2810 var id_buf: [160]u8 = undefined; 2811 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 })); 2812 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2813 try appendFormAttribute(allocator, output, root_focus, id); 2814 if (ti.options.name.len > 0) { 2815 try output.appendSlice(allocator, " name=\""); 2816 try appendEscapedHtml(allocator, output, ti.options.name); 2817 try output.append(allocator, '"'); 2818 } 2819 if (child.focus.kind != .text_input_password) { 2820 const value = try ti.text(allocator); 2821 defer allocator.free(value); 2822 try output.appendSlice(allocator, " value=\""); 2823 try appendEscapedHtml(allocator, output, value); 2824 try output.append(allocator, '"'); 2825 } 2826 var pos_buf: [96]u8 = undefined; 2827 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 })); 2828 }, 2829 .custom => |custom| { 2830 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2831 if (formOwner(root_focus, id) == null) continue; 2832 var id_buf: [128]u8 = undefined; 2833 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2834 try appendFormAttribute(allocator, output, root_focus, id); 2835 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2836 try output.appendSlice(allocator, " formaction=\""); 2837 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2838 try output.append(allocator, '"'); 2839 } 2840 var pos_buf: [128]u8 = undefined; 2841 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 })); 2842 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2843 // an invisible native radio over the option, checked when the option is its row's selection 2844 const field = custom[ui.radio_prefix.len..]; 2845 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2846 const row = root_focus.children.get(child.parent_id) orelse continue; 2847 var id_buf: [128]u8 = undefined; 2848 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2849 try appendFormAttribute(allocator, output, root_focus, id); 2850 try output.appendSlice(allocator, " name=\""); 2851 try appendEscapedHtml(allocator, output, field[0..separator]); 2852 try output.appendSlice(allocator, "\" value=\""); 2853 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2854 try output.append(allocator, '"'); 2855 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2856 var pos_buf: [128]u8 = undefined; 2857 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 })); 2858 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2859 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2860 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2861 var id_buf: [128]u8 = undefined; 2862 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 })); 2863 } 2864 }, 2865 else => {}, 2866 } 2867 } 2868 } 2869 2870 // emit hidden form owners beside the rendered panels. their controls point 2871 // back here with the standard HTML `form` attribute. 2872 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2873 // the focus child map preserves insertion order, which matches the order 2874 // widgets were added in code 2875 var iter = root_focus.children.iterator(); 2876 while (iter.next()) |entry| { 2877 const child = entry.value_ptr.*; 2878 const action_url = formAction(child.focus) orelse continue; 2879 2880 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2881 var id_buf: [96]u8 = undefined; 2882 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2883 try appendEscapedHtml(allocator, output, action_url); 2884 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2885 } 2886 } 2887 2888 // the 16 ansi colors as the browser shows them (xterm's defaults) 2889 const ansi_palette = [16]Grid.Color.Rgb{ 2890 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2891 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2892 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2893 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2894 }; 2895 2896 // resolve any color to rgb: palette colors through the ansi table and the 2897 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2898 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2899 return switch (color) { 2900 .rgb => |c| c, 2901 .ansi => |a| ansi_palette[@backingInt(a)], 2902 .indexed => |n| if (n < 16) 2903 ansi_palette[n] 2904 else if (n < 232) blk: { 2905 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2906 const i = n - 16; 2907 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2908 } else blk: { 2909 const v: u8 = 8 + (n - 232) * 10; 2910 break :blk .{ .r = v, .g = v, .b = v }; 2911 }, 2912 }; 2913 } 2914 2915 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2916 // cell's style into `buf`, omitting whichever color is unset. an inverted 2917 // cell swaps the two, falling back to the page's --fg/--bg variables for 2918 // whichever side is unset. text attributes follow the colors. returns an 2919 // empty slice when nothing is set. 2920 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2921 if (style.eql(.{})) return buf[0..0]; 2922 const prefix = " style=\""; 2923 @memcpy(buf[0..prefix.len], prefix); 2924 var i: usize = prefix.len; 2925 const inverted = style.inverted; 2926 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2927 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2928 const decoration: []const u8 = if (style.underline and style.strikethrough) 2929 "text-decoration:underline line-through;" 2930 else if (style.underline) 2931 "text-decoration:underline;" 2932 else if (style.strikethrough) 2933 "text-decoration:line-through;" 2934 else 2935 ""; 2936 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2937 if (style.bold) "font-weight:bold;" else "", 2938 if (style.italic) "font-style:italic;" else "", 2939 decoration, 2940 if (style.dim) "opacity:.6;" else "", 2941 }) catch return buf[0..0]; 2942 i += attributes.len; 2943 if (i >= buf.len) return buf[0..0]; 2944 buf[i] = '"'; 2945 return buf[0 .. i + 1]; 2946 } 2947 2948 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2949 // the color is unset (nothing when both are). returns the new end, or null 2950 // when it doesn't fit. 2951 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2952 const s = if (color) |c| blk: { 2953 const v = colorRgb(c); 2954 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; 2955 } else if (fallback) |f| 2956 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2957 else 2958 return i; 2959 return i + s.len; 2960 } 2961 2962 // a cell's link as an href, when it's a page path or a web or mail url 2963 fn webLink(link: ?[]const u8) ?[]const u8 { 2964 const url = link orelse return null; 2965 // a page path, not a protocol-relative url 2966 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2967 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2968 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2969 } 2970 return null; 2971 } 2972 2973 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2974 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2975 return b == null; 2976 } 2977 2978 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2979 for (input) |ch| { 2980 switch (ch) { 2981 '&' => try out.appendSlice(allocator, "&amp;"), 2982 '<' => try out.appendSlice(allocator, "&lt;"), 2983 '>' => try out.appendSlice(allocator, "&gt;"), 2984 '"' => try out.appendSlice(allocator, "&quot;"), 2985 '\'' => try out.appendSlice(allocator, "&#39;"), 2986 else => try out.append(allocator, ch), 2987 } 2988 } 2989 } 2990 2991 // --- helpers -------------------------------------------------------------- 2992 2993 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2994 var iter = request.iterateHeaders(); 2995 while (iter.next()) |header| { 2996 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2997 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2998 while (pairs.next()) |pair| { 2999 const trimmed = std.mem.trim(u8, pair, " \t"); 3000 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 3001 if (std.mem.eql(u8, trimmed[0..eq], name)) { 3002 return trimmed[eq + 1 ..]; 3003 } 3004 } 3005 } 3006 return null; 3007 } 3008 3009 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 3010 var iter = std.mem.splitScalar(u8, body, '&'); 3011 while (iter.next()) |pair| { 3012 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 3013 if (std.mem.eql(u8, pair[0..eq], key)) { 3014 return try decodeFormValue(allocator, pair[eq + 1 ..]); 3015 } 3016 } 3017 return null; 3018 } 3019 3020 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 3021 var buffer: [256]u8 = undefined; 3022 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 3023 } 3024 3025 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 3026 var out: std.ArrayList(u8) = .empty; 3027 errdefer out.deinit(allocator); 3028 var i: usize = 0; 3029 while (i < encoded.len) : (i += 1) { 3030 switch (encoded[i]) { 3031 '+' => try out.append(allocator, ' '), 3032 '%' => { 3033 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 3034 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 3035 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 3036 try out.append(allocator, hi * 16 + lo); 3037 i += 2; 3038 }, 3039 else => try out.append(allocator, encoded[i]), 3040 } 3041 } 3042 return try out.toOwnedSlice(allocator); 3043 } 3044 3045 // disk-backed web session store. each login mints a random, opaque token 3046 // (not the user's id) that is stored as a file named by the token hex, whose 3047 // contents are the raw user_id bytes. authenticating a request is a lookup of 3048 // the cookie's token; logout deletes the file, revoking the session. there is 3049 // deliberately no expiry — a session lives until logout. form failures use 3050 // files in the flash subdirectory that the redirected GET consumes. the 3051 // directory is cleared whenever the server starts. 3052 pub const SessionStore = struct { 3053 io: std.Io, 3054 dir: std.Io.Dir, 3055 flash_dir: std.Io.Dir, 3056 auto_login: ?[token_hex_len]u8, 3057 3058 pub const token_hex_len = evt.event_id_size * 2; 3059 3060 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 3061 try data_dir.createDirPath(io, "sessions"); 3062 const dir = try data_dir.openDir(io, "sessions", .{}); 3063 errdefer dir.close(io); 3064 try dir.deleteTree(io, "flash"); 3065 try dir.createDirPath(io, "flash"); 3066 const flash_dir = try dir.openDir(io, "flash", .{}); 3067 errdefer flash_dir.close(io); 3068 const auto_login = blk: { 3069 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 3070 defer file.close(io); 3071 var token: [token_hex_len]u8 = undefined; 3072 var storage: [token_hex_len]u8 = undefined; 3073 var reader = file.reader(io, &storage); 3074 reader.interface.readSliceAll(&token) catch break :blk null; 3075 break :blk token; 3076 }; 3077 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 3078 } 3079 3080 pub fn deinit(self: SessionStore) void { 3081 self.flash_dir.close(self.io); 3082 self.dir.close(self.io); 3083 } 3084 3085 // mint a new session for user_id, returning the token hex to set as the 3086 // cookie value. 3087 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 3088 var token: [evt.event_id_size]u8 = undefined; 3089 self.io.random(&token); 3090 const token_hex = std.fmt.bytesToHex(token, .lower); 3091 const file = try self.dir.createFile(self.io, &token_hex, .{}); 3092 defer file.close(self.io); 3093 try file.writeStreamingAll(self.io, user_id); 3094 return token_hex; 3095 } 3096 3097 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 3098 var token: [evt.event_id_size]u8 = undefined; 3099 self.io.random(&token); 3100 const token_hex = std.fmt.bytesToHex(token, .lower); 3101 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 3102 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 3103 defer file.close(self.io); 3104 3105 var json: std.Io.Writer.Allocating = .init(allocator); 3106 defer json.deinit(); 3107 try std.json.Stringify.value(value, .{}, &json.writer); 3108 try file.writeStreamingAll(self.io, json.written()); 3109 return token_hex; 3110 } 3111 3112 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 3113 if (!isToken(token_hex)) return null; 3114 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 3115 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 3116 defer file.close(self.io); 3117 3118 var storage: [4096]u8 = undefined; 3119 var reader = file.reader(self.io, &storage); 3120 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 3121 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 3122 } 3123 3124 // resolve a cookie's token to its user_id. returns false (logged out) for a 3125 // missing, malformed, or unknown token. 3126 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 3127 if (!isToken(token_hex)) return false; 3128 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 3129 defer file.close(self.io); 3130 var storage: [evt.event_id_size]u8 = undefined; 3131 var file_reader = file.reader(self.io, &storage); 3132 file_reader.interface.readSliceAll(out) catch return false; 3133 return true; 3134 } 3135 3136 // revoke a session. a no-op for a missing or malformed token. 3137 pub fn remove(self: SessionStore, token_hex: []const u8) void { 3138 if (!isToken(token_hex)) return; 3139 self.dir.deleteFile(self.io, token_hex) catch {}; 3140 } 3141 3142 // leave `token_hex`'s session for visitors arriving without one. only the 3143 // `try` fixture writes one. the name can't collide with a session token. 3144 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 3145 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 3146 defer file.close(self.io); 3147 try file.writeStreamingAll(self.io, token_hex); 3148 } 3149 3150 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 3151 out.* = self.auto_login orelse return false; 3152 return true; 3153 } 3154 3155 const auto_login_name = "auto-login"; 3156 3157 // a token is exactly token_hex_len hex chars. validating before using the 3158 // value as a path keeps attacker-supplied cookies from escaping the 3159 // sessions dir (e.g. via "/" or ".." bytes). 3160 fn isToken(token_hex: []const u8) bool { 3161 if (token_hex.len != token_hex_len) return false; 3162 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 3163 return true; 3164 } 3165 }; 3166