feat(oxauth): uppercased typ=JWT #1903 (#1904)

Model/src/main/java/org/gluu/oxauth/model/jwt/JwtType.java

@@ -12,7 +12,13 @@
  */
 public enum JwtType {
 
-    JWT;
+    JWT("JWT");
+
+    private final String paramName;
+
+    JwtType(String paramName) {
+        this.paramName = paramName;
+    }
 
     /**
      * Returns the corresponding {@link JwtType} for a parameter.
@@ -30,4 +36,13 @@ public static JwtType fromString(String param) {
         }
         return null;
     }
+
+    public String getParamName() {
+        return paramName;
+    }
+
+    @Override
+    public String toString() {
+        return paramName;
+    }
 }

Model/src/test/java/org/gluu/oxauth/model/jwt/JwtTypeTest.java

@@ -0,0 +1,16 @@
+package org.gluu.oxauth.model.jwt;
+
+import org.testng.annotations.Test;
+
+import static org.testng.Assert.assertEquals;
+
+/**
+ * @author Yuriy Z
+ */
+public class JwtTypeTest {
+
+    @Test
+    public void jwtTypeHeader_mustBeUppercased() {
+        assertEquals(JwtType.JWT.toString(), "JWT");
+    }
+}