Testing Lambda Function Operations

Upload and Test Image in S3 Bucket

1. Access S3 Bucket book-image-stores-by-myself:

2. Click the Upload button to begin the upload process

3. In the Upload interface:
   • Select Add files to add files

• Select the image file to upload and click Upload

4. Wait for Lambda Function to process:
   • After successful upload

• Check if the original image has been moved (source bucket will be empty)

Access Processed Image

5. Open destination S3 Bucket book-image-resize-stores-by-myself:

• Find and select the processed image file

6. Access the image:
   • Click on Object URL to download the image

7. Handle access error:
   • You will receive an Access Denied message

Configure Bucket Access Permissions

8. Set up Bucket policy:
   • Return to Bucket configuration, select the Permissions tab
   • Click Edit in the Bucket policy section

• Add the following JSON policy:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "PublicReadGetObject",
            "Effect": "Allow",
            "Principal": "*",
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::book-image-resize-stores-by-myself/*"
        }
    ]
}

• Click Save changes to save the policy

9. Confirm the policy has been saved successfully

10. Verify operation:

• Try accessing the Object URL again to view the image
• Compare the resized image with the original to verify the result
• Lambda Function resize has operated successfully