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