Azure Storage Blob Source: Add CloudEvents Data Type Transformer (#1644)

Signed-off-by: Andrea Cosentino <ancosen@gmail.com>

library/camel-kamelets-utils/pom.xml

@@ -87,6 +87,11 @@
             <artifactId>camel-aws2-sqs</artifactId>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-azure-storage-blob</artifactId>
+            <scope>provided</scope>
+        </dependency>
 
         <!-- Dependencies for mongodb connection configuration -->
         <dependency>

library/camel-kamelets-utils/src/main/java/org/apache/camel/kamelets/utils/format/converter/azure/storage/blob/AzureStorageBlobCloudEventOutputType.java

@@ -0,0 +1,47 @@
+/*
+ * 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.camel.kamelets.utils.format.converter.azure.storage.blob;
+
+import org.apache.camel.Message;
+import org.apache.camel.component.aws2.s3.AWS2S3Constants;
+import org.apache.camel.component.azure.storage.blob.BlobConstants;
+import org.apache.camel.kamelets.utils.format.converter.utils.CloudEvents;
+import org.apache.camel.spi.DataType;
+import org.apache.camel.spi.DataTypeTransformer;
+import org.apache.camel.spi.Transformer;
+
+import java.util.Map;
+
+/**
+ * Output data type represents Azure Storage Blob get blob response as CloudEvent V1. The data type sets Camel specific
+ * CloudEvent headers on the exchange.
+ */
+@DataTypeTransformer(name = "azure-storage-blob:application-cloudevents")
+public class AzureStorageBlobCloudEventOutputType extends Transformer {
+
+    @Override
+    public void transform(Message message, DataType fromType, DataType toType) {
+        final Map<String, Object> headers = message.getHeaders();
+
+        headers.put(CloudEvents.CAMEL_CLOUD_EVENT_ID, message.getExchange().getExchangeId());
+        headers.put(CloudEvents.CAMEL_CLOUD_EVENT_TYPE, "org.apache.camel.event.azure.storage.blob.getBlob");
+        headers.put(CloudEvents.CAMEL_CLOUD_EVENT_SOURCE, "azure.storage.blob." + message.getHeader(BlobConstants.BLOB_NAME, String.class));
+        headers.put(CloudEvents.CAMEL_CLOUD_EVENT_SUBJECT, message.getHeader(BlobConstants.BLOB_NAME, String.class));
+        headers.put(CloudEvents.CAMEL_CLOUD_EVENT_TIME, CloudEvents.getEventTime(message.getExchange()));
+    }
+}

library/camel-kamelets-utils/src/main/resources/META-INF/services/org/apache/camel/datatype/transformer/azure-storage-blob-application-cloudevents

@@ -0,0 +1,18 @@
+#
+# 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.
+#
+
+class=org.apache.camel.kamelets.utils.format.converter.azure.storage.blob.AzureStorageBlobCloudEventOutputType