Make it easier to use a CognitoUserPool authorizer when the pool is configured in the same service.

[alexdebrie]

This update makes it easier to use a Cognito User Pool as an APIGW authorizer when the pool is created in the same service.

Before this fix, it required this (suggested here):

...

functions:
  getStuff:
    handler: path/to/handler
    events:
      - http:
          path: /path/to/whatever
          method: get
          authorizer:
            type: COGNITO_USER_POOLS
            authorizerId:
              Ref: ApiGatewayAuthorizer

...

resources:
  Resources:
    CognitoUserPool:
      Type: AWS::Cognito::UserPool
      Properties:
        UserPoolName: whatever
    ApiGatewayAuthorizer:
      DependsOn:
        - ApiGatewayRestApi
      Type: AWS::ApiGateway::Authorizer
      Properties:
        Name: whatever
        IdentitySource: method.request.header.Authorization
        RestApiId:
          Ref: ApiGatewayRestApi
        Type: COGNITO_USER_POOLS
        ProviderARNs:
          - Fn::GetAtt: [CognitoUserPool, Arn]

...

Now you can achieve the same thing with this:

functions:
  getStuff:
    handler: path/to/handler
    events:
      - http:
          path: /path/to/whatever
          method: get
          authorizer:
            type: COGNITO_USER_POOLS
            name: 'MyAuthorizer'
            arn:
              Fn::GetAtt:
                - CognitoUserPool
                - Arn

Hattip to @brettstack for some pointers.

[codecov-commenter]

Codecov Report

Merging #7799 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #7799   +/-   ##
=======================================
  Coverage   88.15%   88.15%           
=======================================
  Files         245      245           
  Lines        9267     9269    +2     
=======================================
+ Hits         8169     8171    +2     
  Misses       1098     1098           

Impacted Files	Coverage Δ
...ckage/compile/events/apiGateway/lib/authorizers.js	100.00% <ø> (ø)
...ckage/compile/events/apiGateway/lib/permissions.js	88.23% <ø> (ø)
...pile/events/apiGateway/lib/method/authorization.js	100.00% <100.00%> (ø)
.../package/compile/events/apiGateway/lib/validate.js	97.00% <100.00%> (+0.02%)	⬆️

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[medikoo]

Thank you @alexdebrie, It indeed simplifies this troublesome case