Add support for (created) and (expired) fields

Author: sebastien-rosset

src/main/java/org/tomitribe/auth/signatures/Signature.java

@@ -513,13 +513,12 @@ private static String normalize(String authorization) {
 
     @Override
     public String toString() {
-        String s = "Signature " +
+        return "Signature " +
                 "keyId=\"" + keyId + '\"' +
                 (signatureCreatedTime != null ? String.format(",created=%d", signatureCreatedTime / 1000L) : "") +
                 (signatureExpiresTime != null ? String.format(",expires=%.3f", signatureExpiresTime / 1000.0) : "") +
                 ",algorithm=\"" + algorithm + '\"' +
                 ",headers=\"" + Join.join(" ", headers) + '\"' +
                 ",signature=\"" + signature + '\"';
-        return s;
     }
 }

src/main/java/org/tomitribe/auth/signatures/Signer.java

@@ -98,10 +98,9 @@ public Signature sign(final String method, final String uri, final Map<String, S
 
         final String signedAndEncodedString = new String(encoded, "UTF-8");
 
-        Signature s = new Signature(signature.getKeyId(), signature.getSigningAlgorithm(),
+        return new Signature(signature.getKeyId(), signature.getSigningAlgorithm(),
                              signature.getAlgorithm(), signature.getParameterSpec(),
                              signedAndEncodedString, signature.getHeaders(), null, created, expires);
-        return s;
     }
 
     /**