Before I Call GPT Image 2, I Validate These 7 Things

The provided JavaScript function preflightGPTImage2 is designed to validate a request for generating images using an AI model, likely from a service like GPT-Image. The function checks various aspects of the request to ensure it adheres to certain rules and contracts before proceeding with the actual image generation process.

Here's a breakdown of what the function does:

1. Contract Validation:

   • It first checks if there is an existing contract for the model specified in body.model. If no such contract exists, it adds an error message.

2. Basic Request Checks:

   • Ensures that the prompt (body.prompt) is not empty or just whitespace.
   • Verifies that the number of images requested (body.n) is exactly 1 (to avoid batch requests).
   • Confirms that replyType is set to "json".

3. Field Validation:

   • If a contract exists, it checks for unknown fields in the request body and adds any validation errors.
   • It also validates image dimensions if specified (validateDimensions function).

4. Reference Image Rights Check:

   • Ensures that reference images are only used when their rights state is confirmed.

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