╭─────────────╮ │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 │ ╰─────────────────────────────────╯
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