resource/aws_api_gateway_authorizer: Add support for Cognito User Pool authorizer

[josselin-c]

WIP/Help Needed

Add support for ProviderARNs parameter for the API Gateway Authorizer object
With this patch it's possible to use a Cognito User Pool as an Authorizer.

API Doc: http://docs.aws.amazon.com/fr_fr/AWSCloudFormation/latest/UserGuide/aws-resource-apigateway-authorizer.html

Fix #1106

[radeksimko]

Depends on #1419

[radeksimko]

Hi @josselin-c
thanks for raising this PR.

We'll be merging #1419 soon. Do you mind rebasing your branch & adding an acceptance test for this new field after that's done?

[josselin-c]

I rebased my patch over master and now I'm trying to add an acceptance test for the feature.
There is a problem in my code I'm trying to fix:
In func resourceAwsApiGatewayAuthorizerUpdate I don't get how to create a apigateway.PatchOperation when provider_arns changes. A PatchOperation takes a string value but in this case provider_arns is a slice of strings []string. How do you go from []string to string?
Here is the struct definition: https://godoc.org/github.com/aws/aws-sdk-go/service/apigateway#PatchOperation

[josselin-c]

Anyone can help me on this?

[loivis]

I’ll try to see how to merge my code here later today from #3156

[josselin-c]

@loivis I can see your PR was way more advanced than mine. I won't mind if you continue with yours. I got my answer reading your patch 👍

[loivis]

@josselin-c Thanks. Would you mind if close this PR and then I'll reopen #3156 ? I haven't tried to commit to other repo thus don't know if I need time to figure that out.

[ghost]

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