Pull requests list [AI Gateway] Rename injected transformer provider parameter to providerId

[Aakashwije]

Purpose

PR #2684 renamed the injected multi-provider transformer parameter from id to provider-id. However, transformer policy parameters follow camelCase naming conventions, and the expected parameter name is providerId.

This follow-up corrects the parameter contract so transformer policies can reliably identify and route requests to the selected upstream provider.

Follow-up to #2684.

Goals

• Rename the injected transformer parameter from provider-id to providerId.
• Align the Gateway Controller and transformer policies on the camelCase parameter contract.
• Preserve the existing provider selection and upstream routing behavior.
• Update the relevant unit test and sample comments.

Approach

The Gateway Controller now injects the resolved provider upstream name using:

params["providerId"] = name

The existing provider-name resolution behavior remains unchanged:

• Use additionalProviders[].as when configured.
• Otherwise, use additionalProviders[].id.
• Execute the transformer only when its provider is selected.

The corresponding unit-test assertion and multi-provider proxy sample comments were also updated to use providerId.

This change does not affect the UI.

User stories

• As an API developer, I want transformer policies to receive the provider identifier using the expected parameter name so requests are routed correctly.
• As a platform developer, I want the Gateway Controller and transformer policies to use a consistent camelCase parameter contract.
• As an operator, I want existing multi-provider configurations to continue working without configuration changes.

Documentation

N/A — providerId is injected internally by the Gateway Controller and is not a user-configured API field.

The comments in the openai-multi-provider-proxy.yaml sample were updated to describe the corrected internal contract.

Automation tests

• Unit tests

  • Updated TestLLMProviderTransformer_TransformProxy_AdditionalProviderTransformerIsConditional to verify that the resolved provider name is injected through params["providerId"].
  • The focused Gateway Controller unit test passes.
  • Code coverage was not measured separately for this focused change.

• Integration tests

  • No new integration tests were added.
  • The change is limited to correcting the name of an internally injected transformer parameter.
  • Provider selection, execution conditions, and upstream-name resolution remain unchanged.

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? Yes
• Ran FindSecurityBugs plugin and verified report? N/A — this is a Go change, and FindSecurityBugs applies to Java projects
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? Yes

Samples

Updated the OpenAI multi-provider proxy sample comments to document that each transformer receives its resolved upstream provider name through providerId.

No sample configuration fields were renamed:

• additionalProviders[].id remains unchanged.
• additionalProviders[].as remains unchanged.
• Router mappings and selected_provider metadata remain unchanged.

Related PRs

• [AI Gateway] Rename injected transformer provider parameter to provider-id #2684
• [Transformers] Add OpenAI multi-provider transformer policies gateway-controllers#222
• [Transformer] add Bedrock transformer gateway-controllers#228
• [AI Gateway] Add multi-provider routing for LLM proxies #2586

Test environment

• Go: 1.26.x
• Operating system: macOS, ARM64
• JDK: N/A
• Database: N/A
• Browser: N/A

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