╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭7690bfb7..╮ 7690bfb7.. haxy: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues patches new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (689) 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 │ ╰─────────────────────────────────╯
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