Spike: Investigate rate limiting or other controls for AI APIs

[john-thomas-dotcms]

We need to investigate and define what it would take to add rate limiting to the dotAI APIs. There are sure to be patterns we can use for this; we need to figure out which one(s) would make the most sense.

Rate limiting could be applied in different ways:

• Overall (number of requests on the whole system).
  • This is far from ideal, since it leaves the system open to a simple denial of service attack.
• To individual users (via unique auth tokens).
• To individual IPs.
  • This might not make sense in most architectures - see Requirements, below.

Limits could be determined by different metrics:

• Number of requests in a given time period.
• Length of input and/or output.
• Number of tokens (as defined by OpenAI).
  • This might require a separate call to count the tokens before submitting the request.
• Delay between subsequent requests.

Requirements:

• Rate limiting must work when dotCMS is fronted by a CDN.
• Rate limiting must work when all API requests go through a load balancer.

In an ideal implementation:

• Any rate limits implemented should be configurable (via the App or config props/env vars).
• The rate limiting method should be something we can re-use for other core dotCMS APIs later.

[github-actions[bot]]

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[sfreudenthaler]

FYI @john-thomas-dotcms we're looking at rate-limiting in the context of other API endpoints. Let me know if you want to jam together