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Clients of this API may use S3 SDK directly in their native language to delete objects from S3 when the record the objects belongs to are removed. This /delete endpoint (or what we'll call it) will just be a convenience endpoint where clients can do DELETE request, give a set of URLs and a bucket.

Maybe something like this:

{
  "urls": [
    "http://s3.com/api/XXX/sha1ofsomefile",
    "http://or.cloudfront.com/sha1ofsomeotherfile"
  ],
  "options": {
    "awsAccessKeyId": "xxx",
    "awsSecretAccessKey": "xxx",
    "s3Bucket": "xxx",
    "s3Region": "xxx"
  }
}

This will simply delegate to S3Client#deleteUrls which supports deleting an arbitrary number of urls.

Sending in URLs like for instance

{
  "urls" : {"thumb":"dummy"}
}

Makes the app crash. We should validate URLs and handle the error when we get ECONNREFUSED when trying GET requests.

Use JSON Schema instead of expressValidator to both describe and validate our API.

See Express' documentation for more information.