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lib/src/jsonwebtoken.dart

@@ -0,0 +1,58 @@
+import 'dart:convert';
+
+import 'package:crypto/crypto.dart';
+
+enum Algorithm {
+  HS256,
+  RS256,
+}
+
+class JWT {
+  JWT({
+    this.payload,
+  });
+
+  static String secretKey = null;
+
+  Map<String, dynamic> payload;
+  String audience;
+  String subject;
+  String issuer;
+
+  String signedToken;
+
+  String sign({
+    String key,
+    Algorithm algorithm = Algorithm.HS256,
+    Duration expiresIn = const Duration(days: 7),
+    bool noTimestamp = false,
+  }) {
+    if (key == null && JWT.secretKey != null) key = JWT.secretKey;
+    assert(key != null);
+
+    final headers = {'alg': algorithm.toString().split('.').last, 'typ': 'JWT'};
+    final encodedHeader = _base64Unpadded(_jsonToBase64Url.encode(headers));
+    final encodedPayload = _base64Unpadded(_jsonToBase64Url.encode(payload));
+
+    final body = encodedHeader + '.' + encodedPayload;
+
+    final signature = _base64Unpadded(base64Url.encode(_sign(body, key)));
+
+    return body + '.' + signature;
+  }
+
+  List<int> _sign(String body, String key) {
+    final hmac = Hmac(sha256, utf8.encode(key));
+    return hmac.convert(utf8.encode(body)).bytes;
+  }
+
+  final _jsonToBase64Url = json.fuse(utf8.fuse(base64Url));
+
+  String _base64Unpadded(String value) {
+    if (value.endsWith('==')) return value.substring(0, value.length - 2);
+    if (value.endsWith('=')) return value.substring(0, value.length - 1);
+    return value;
+  }
+
+  static JWT verify(String token) {}
+}