new resource aws_iam_outbound_web_identity_federation

[alexbacchin]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

Introduce a new Terraform resource to manage the IAM “Outbound Web Identity Federation” account setting.

• New resource: aws_iam_outbound_web_identity_federation
• No arguments
• Exports 2 attributes issuer_identifier and jwt_vending_enabled as per API
• On create: enables the account-level setting
• On destroy: disables the account-level setting
• No import support (intentional). If setting already enabled it will adopt the account setting with no errors

Usage

resource "aws_iam_outbound_web_identity_federation" "this" {}

Notes

This resource is intentionally stateful for a binary account-level toggle. It follows the provider pattern for similar account settings where the presence of the resource enforces “enabled,” and its absence enforces “disabled.”

Relations

Closes #45146

References

Output from Acceptance Testing

% make testacc TESTS=TestAccIAMOutboundWebIdentityFederation_serial PKG=iam 
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
make: Running acceptance tests on branch: 🌿 f-iam_outbound_web_identity_federation 🌿...
TF_ACC=1 go1.24.10 test ./internal/service/iam/... -v -count 1 -parallel 20 -run='TestAccIAMOutboundWebIdentityFederation_serial'  -timeout 360m -vet=off
2025/11/22 19:39:40 Creating Terraform AWS Provider (SDKv2-style)...
2025/11/22 19:39:40 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccIAMOutboundWebIdentityFederation_serial
=== RUN   TestAccIAMOutboundWebIdentityFederation_serial/basic
=== RUN   TestAccIAMOutboundWebIdentityFederation_serial/alreadyEnabled
--- PASS: TestAccIAMOutboundWebIdentityFederation_serial (32.00s)
    --- PASS: TestAccIAMOutboundWebIdentityFederation_serial/basic (16.41s)
    --- PASS: TestAccIAMOutboundWebIdentityFederation_serial/alreadyEnabled (15.59s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/iam        36.472s

...

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