Added Lambda environment variable

Author: alfonsof

awslambdas3copy/README.md

@@ -82,7 +82,7 @@ It handles an AWS Lambda function that copies an object when it appears in a S3
 
   This role uses the policy `Policy-my-buckets`
 
-* Create an AWS lambda function:
+* Create an AWS Lambda function:
   * Name: `<LAMBDA_NAME>`
   * Runtime: `Java 8`
   * Handler: `example.S3CopyHandler::handleRequest`
@@ -103,6 +103,8 @@ It handles an AWS Lambda function that copies an object when it appears in a S3
     * Memory (MB): `1024`
     * Timeout: `10 sec`
 
+* Create the AWS Lambda environment variable `TARGET_BUCKET` and set its value to the name of your target bucket.
+
 * Upload the Java JAR file.
 
   Artifact:

awslambdas3copy/src/main/java/example/S3CopyHandler.java

@@ -19,8 +19,6 @@
 
 public class S3CopyHandler implements RequestHandler<S3Event, String> {
 
-    private static final String DESTINATION_BUCKET        = "targetbucket10";      // Destination bucket name
-
     @Override
     public String handleRequest(S3Event s3Event, Context context) {
         String sourceBucketName;              // Source bucket name
@@ -40,11 +38,16 @@ public String handleRequest(S3Event s3Event, Context context) {
         sourceKeyName = record.getS3().getObject().getKey(); // Name doesn't contain any special characters
 
         // Destination Bucket Name
-        destinationBucketName = DESTINATION_BUCKET;
+        destinationBucketName = System.getenv("TARGET_BUCKET");
 
         // Destination File Name
         destinationKeyName = sourceKeyName;
 
+        if (destinationBucketName == null || destinationBucketName.isEmpty()) {
+            logger.log("Error: TARGET_BUCKET Lambda environment variable does not exist!!");
+            System.exit(1);
+        }
+
         logger.log("S3Event: " + s3Event);
         logger.log("Source Bucket: " + sourceBucketName + "\n");
         logger.log("Source Object: " + sourceKeyName + "\n");