Handled generic require for Date. Added ability to specify required type on get method of claim

src/main/java/io/jsonwebtoken/Claims.java

@@ -170,4 +170,5 @@ public interface Claims extends Map<String, Object>, ClaimsMutator<Claims> {
     @Override //only for better/targeted JavaDoc
     Claims setId(String jti);
 
+    <T> T get(String claimName, Class<T> requiredType);
 }

src/main/java/io/jsonwebtoken/RequiredTypeException.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2014 jsonwebtoken.io
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.jsonwebtoken;
+
+/**
+ * Exception thrown when {@link Claims#get(String, Class)} is called and the value does not match the type of the
+ * {@code Class} argument.
+ *
+ * @since 0.6
+ */
+public class RequiredTypeException extends JwtException {
+    public RequiredTypeException(String message) {
+        super(message);
+    }
+
+    public RequiredTypeException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

src/main/java/io/jsonwebtoken/impl/DefaultClaims.java

@@ -16,6 +16,7 @@
 package io.jsonwebtoken.impl;
 
 import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.RequiredTypeException;
 
 import java.util.Date;
 import java.util.Map;
@@ -106,4 +107,20 @@ public class DefaultClaims extends JwtMap implements Claims {
         setValue(Claims.ID, jti);
         return this;
     }
+
+    @Override
+    public <T> T get(String claimName, Class<T> requiredType) {
+        Object value = get(claimName);
+        if (value == null) { return null; }
+
+        if (requiredType == Date.class && value instanceof Long) {
+            value = new Date((Long)value);
+        }
+
+        if (!requiredType.isInstance(value)) {
+            throw new RequiredTypeException("Expected value to be of type: " + requiredType + ", but was " + value.getClass());
+        }
+
+        return requiredType.cast(value);
+    }
 }

src/main/java/io/jsonwebtoken/impl/DefaultJwtParser.java

@@ -378,31 +378,20 @@ public class DefaultJwtParser implements JwtParser {
     private void validateExpectedClaims(Header header, Claims claims) {
         for (String expectedClaimName : expectedClaims.keySet()) {
 
-            // this will be overridden if one of the default claims is used
             Object expectedClaimValue = expectedClaims.get(expectedClaimName);
             Object actualClaimValue = claims.get(expectedClaimName);
 
             if (Claims.ISSUED_AT.equals(expectedClaimName)) {
                 expectedClaimValue = expectedClaims.getIssuedAt();
                 actualClaimValue = claims.getIssuedAt();
-            } else if (Claims.AUDIENCE.equals(expectedClaimName)) {
-                expectedClaimValue = expectedClaims.getAudience();
-                actualClaimValue = claims.getAudience();
-            } else if (Claims.ISSUER.equals(expectedClaimName)) {
-                expectedClaimValue = expectedClaims.getIssuer();
-                actualClaimValue = claims.getIssuer();
-            } else if (Claims.SUBJECT.equals(expectedClaimName)) {
-                expectedClaimValue = expectedClaims.getSubject();
-                actualClaimValue = claims.getSubject();
             } else if (Claims.EXPIRATION.equals(expectedClaimName)) {
                 expectedClaimValue = expectedClaims.getExpiration();
                 actualClaimValue = claims.getExpiration();
             } else if (Claims.NOT_BEFORE.equals(expectedClaimName)) {
                 expectedClaimValue = expectedClaims.getNotBefore();
                 actualClaimValue = claims.getNotBefore();
-            } else if (Claims.ID.equals(expectedClaimName)) {
-                expectedClaimValue = expectedClaims.getId();
-                actualClaimValue = claims.getId();
+            } else if (expectedClaimValue instanceof Date && actualClaimValue != null && actualClaimValue instanceof Long) {
+                actualClaimValue = new Date((Long)actualClaimValue);
             }
 
             InvalidClaimException invalidClaimException = null;

src/test/groovy/io/jsonwebtoken/JwtParserTest.groovy

@@ -1328,20 +1328,68 @@ class JwtParserTest {
         }
     }
 
-//    @Test
-//    void testParseExpectedCustomDate_Success() {
-//        def aDate = new Date(System.currentTimeMillis())
-//
-//        byte[] key = randomKey()
-//
-//        String compact = Jwts.builder().signWith(SignatureAlgorithm.HS256, key).
-//            claim("aDate", aDate).
-//            compact()
-//
-//        Jwt<Header,Claims> jwt = Jwts.parser().setSigningKey(key).
-//            expect("aDate", aDate).
-//            parseClaimsJws(compact)
-//
-//        assertEquals jwt.getBody().get("aDate"), aDate
-//    }
+    @Test
+    void testParseRequireCustomDate_Success() {
+        def aDate = new Date(System.currentTimeMillis())
+
+        byte[] key = randomKey()
+
+        String compact = Jwts.builder().signWith(SignatureAlgorithm.HS256, key).
+            claim("aDate", aDate).
+            compact()
+
+        Jwt<Header,Claims> jwt = Jwts.parser().setSigningKey(key).
+            require("aDate", aDate).
+            parseClaimsJws(compact)
+
+        assertEquals jwt.getBody().get("aDate", Date.class), aDate
+    }
+
+    @Test
+    void testParseRequireCustomDate_Incorrect_Fail() {
+        def goodDate = new Date(System.currentTimeMillis())
+        def badDate = new Date(System.currentTimeMillis() - 10000)
+
+        byte[] key = randomKey()
+
+        String compact = Jwts.builder().signWith(SignatureAlgorithm.HS256, key).
+            claim("aDate", badDate).
+            compact()
+
+        try {
+            Jwts.parser().setSigningKey(key).
+                require("aDate", goodDate).
+                parseClaimsJws(compact)
+            fail()
+        } catch(IncorrectClaimException e) {
+            assertEquals(
+                String.format(INCORRECT_EXPECTED_CLAIM_MESSAGE_TEMPLATE, "aDate", goodDate, badDate),
+                e.getMessage()
+            )
+        }
+
+    }
+
+    @Test
+    void testParseRequireCustomDate_Missing_Fail() {
+        def aDate = new Date(System.currentTimeMillis())
+
+        byte[] key = randomKey()
+
+        String compact = Jwts.builder().signWith(SignatureAlgorithm.HS256, key).
+            setSubject("Dummy").
+            compact()
+
+        try {
+            Jwts.parser().setSigningKey(key).
+                require("aDate", aDate).
+                parseClaimsJws(compact)
+            fail()
+        } catch(MissingClaimException e) {
+            assertEquals(
+                String.format(MISSING_EXPECTED_CLAIM_MESSAGE_TEMPLATE, "aDate", aDate),
+                e.getMessage()
+            )
+        }
+    }
 }

src/test/groovy/io/jsonwebtoken/RequiredTypeExceptionTest.groovy

@@ -0,0 +1,20 @@
+package io.jsonwebtoken
+
+import org.junit.Test
+
+import static org.junit.Assert.assertEquals
+import static org.junit.Assert.assertSame
+
+class RequiredTypeExceptionTest {
+    @Test
+    void testOverloadedConstructor() {
+        def msg = 'foo'
+        def cause = new NullPointerException()
+
+        def ex = new RequiredTypeException(msg, cause)
+
+        assertEquals ex.message, msg
+        assertSame ex.cause, cause
+    }
+
+}

src/test/groovy/io/jsonwebtoken/impl/DefaultClaimsTest.groovy

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2015 jsonwebtoken.io
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.jsonwebtoken.impl
+
+import io.jsonwebtoken.Claims
+import io.jsonwebtoken.RequiredTypeException
+import org.junit.Before
+import org.junit.Test
+import static org.junit.Assert.*
+
+class DefaultClaimsTest {
+
+    Claims claims
+
+    @Before
+    void setup() {
+        claims = new DefaultClaims()
+    }
+
+    @Test
+    void testGetClaimWithRequiredType_Null_Success() {
+        claims.put("aNull", null)
+        Object result = claims.get("aNull", Integer.class)
+        assertNull(result)
+    }
+
+    @Test
+    void testGetClaimWithRequiredType_Exception() {
+        claims.put("anInteger", new Integer(5))
+        try {
+            claims.get("anInteger", String.class)
+            fail()
+        } catch (RequiredTypeException e) {
+            assertEquals(
+                "Expected value to be of type: class java.lang.String, but was class java.lang.Integer",
+                e.getMessage()
+            )
+        }
+    }
+
+    @Test
+    void testGetClaimWithRequiredType_Success() {
+        claims.put("anInteger", new Integer(5))
+        Object result = claims.get("anInteger", Integer.class)
+
+        assertTrue(result instanceof Integer)
+    }
+
+    @Test
+    void testGetClaimWithRequiredType_Date_Success() {
+        def actual = new Date();
+        claims.put("aDate", actual)
+        Date expected = claims.get("aDate", Date.class);
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void testGetClaimWithRequiredType_DateWithLong_Success() {
+        def actual = new Date();
+        // note that Long is stored in claim
+        claims.put("aDate", actual.getTime())
+        Date expected = claims.get("aDate", Date.class);
+        assertEquals(expected, actual);
+    }
+}