NIFI-2902 Fix for S3 Signer v4 Override

This closes #1140.

nifi-nar-bundles/nifi-aws-bundle/nifi-aws-processors/src/main/java/org/apache/nifi/processors/aws/s3/AbstractS3Processor.java

@@ -121,7 +121,7 @@ public abstract class AbstractS3Processor extends AbstractAWSCredentialsProvider
             .required(false)
             .allowableValues(
                     new AllowableValue("Default Signature", "Default Signature"),
-                    new AllowableValue("AWSS3V4Signer", "Signature v4"),
+                    new AllowableValue("AWSS3V4SignerType", "Signature v4"),
                     new AllowableValue("S3SignerType", "Signature v2"))
             .defaultValue("Default Signature")
             .build();

nifi-nar-bundles/nifi-aws-bundle/nifi-aws-processors/src/test/java/org/apache/nifi/processors/aws/s3/TestPutS3Object.java

@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.nifi.processors.aws.s3;
+
+import java.util.List;
+
+import org.apache.nifi.components.AllowableValue;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.util.TestRunner;
+import org.apache.nifi.util.TestRunners;
+
+import com.amazonaws.ClientConfiguration;
+import com.amazonaws.auth.AWSCredentialsProvider;
+import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
+import com.amazonaws.services.s3.AmazonS3Client;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+
+/**
+ * Unit tests for {@link PutS3Object}, without interaction with S3.
+ */
+public class TestPutS3Object {
+
+    @Test
+    public void testSignerOverrideOptions() {
+        final AWSCredentialsProvider credentialsProvider = new DefaultAWSCredentialsProviderChain();
+        final ClientConfiguration config = new ClientConfiguration();
+        final PutS3Object processor = new PutS3Object();
+        final TestRunner runner = TestRunners.newTestRunner(processor);
+
+        final List<AllowableValue> allowableSignerValues = PutS3Object.SIGNER_OVERRIDE.getAllowableValues();
+        final String defaultSignerValue = PutS3Object.SIGNER_OVERRIDE.getDefaultValue();
+
+        for (AllowableValue allowableSignerValue : allowableSignerValues) {
+            String signerType = allowableSignerValue.getValue();
+            if (!signerType.equals(defaultSignerValue)) {
+                runner.setProperty(PutS3Object.SIGNER_OVERRIDE, signerType);
+                ProcessContext context = runner.getProcessContext();
+                try {
+                    AmazonS3Client s3Client = processor.createClient(context, credentialsProvider, config);
+                } catch (IllegalArgumentException argEx) {
+                    Assert.fail(argEx.getMessage());
+                }
+            }
+        }
+    }
+
+}