Add support for AWS ALB redirect action

[fdearle]

Amazon have recently announced support for redirects natively within Application Load Balancers. See Announcement.

This is a useful addition to the ALB as is removes the need to have a separate web server to handle HTTP -> HTTPS redirects.

Configuring the feature requires changes to the aws_lb_listener in terraform. Specifically the default_action needs to support redirect as a type and must also implement a new field type to support the new RedirectActionConfig that has been added to default_action.

The AWS Go SDK has already been updated to support RedirectActionConfig in version 1.14.33.

I would attempt to implement this myself except my limited Go experience does not extend to the schema changes that would need to be implemented to support a new redirect_action_config field type.

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Description

New or Affected Resource(s)

• aws_lb_listener

Potential Terraform Configuration

# The default action will need to support a redirect_action_config, something like:
resource "aws_lb_listener" "default_listener"  {
    ....
    default_action {
        type = "redirect"
        redirect_action_config = {
            protocol = "HTTPS | HTTP | #{protocol}"
            host = "hostname | #{host}"
            port = "port | #{port}"
            path = "path | #{path}"
            query = "query | #{query}"
        }
    }
}

References

• #0000

[ghost]

There is already an issue filled for this and a PR pending:
#5344
#5430

[bflad]

Closing as duplicate of the above mentioned issue and PR to consolidate discussions/efforts. Please track those for further updates. 👍

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!