CorsRules does not support ExposeHeader

[Laurian]

This is a Bug Report

Description

• What went wrong?
  sls deploy reported An error occurred: StorageBucket - Encountered unsupported property ExposeHeader.

• What did you expect should have happened?

sls to update the bucket’s CORS Policy with:

<ExposeHeader>x-amz-server-side-encryption</ExposeHeader>
<ExposeHeader>x-amz-request-id</ExposeHeader>
<ExposeHeader>x-amz-id-2</ExposeHeader>
<ExposeHeader>ETag</ExposeHeader>

• What was the config you used?

resources:
  Resources:
    StorageBucket:
      Type: AWS::S3::Bucket
      DeletionPolicy: Retain
      Properties:
        BucketName: ${self:custom.bucketName}
        CorsConfiguration:
          CorsRules:
            - AllowedOrigins:
                - "*"
              AllowedHeaders:
                - "*"
              AllowedMethods:
                - GET
                - PUT
                - POST
                - DELETE
                - HEAD
              MaxAge: 3000
              ExposeHeader:
                - x-amz-server-side-encryption
                - x-amz-request-id
                - x-amz-id-2
                - ETag

• What stacktrace or error message from your provider did you see?

Without ExposeHeader support I cannot upload to S3 from browser with aws-amplify

AWSS3Provider - error uploading ETagMissing:
No access to ETag property on response.
Check CORS configuration to expose ETag header

Similar or dependent issues:

• S3Bucket - Encountered unsupported property ExposeHeader #6442

Additional Data

• Serverless Framework Version you're using: 1.51.0
• Operating System: macOS 10.15 beta
• Provider Error messages: AWSS3Provider - error uploading ETagMissing: No access to ETag property on response. Check CORS configuration to expose ETag header.

[drexler]

@Laurian looks like you have a typo. What you want is ExposedHeaders. so:

 ExposedHeaders:
    - x-amz-server-side-encryption
    - x-amz-request-id
    - x-amz-id-2
    - ETag