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3ea35af9ad
The chat-route middleware operates on `req.body.text`, but the remote agent API endpoints (`/api/agents/v1/chat/completions`, `/api/agents/v1/responses`) accept the same prompt content as a `messages` array or an `input` field. A caller using their API key could send a credential-shaped value through either route and bypass the configured PII filter even though they share the same agent and model backbone the middleware is meant to guard. Factored out `findPiiMatchInMessages`, a tolerant walker that handles both `content: string` and `content: ContentPart[]` user-message shapes against the same compiled, cached pattern list. Wired it into the OpenAI-compat controller after agent lookup and into the Responses controller right after `convertToInternalMessages`. Each returns the endpoint's native 400 error shape (`sendErrorResponse` / `sendResponsesErrorResponse`) with the `message_pii_filter_block` code when a user message matches. |
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