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This PR is to add the SAP Generative AI Hub as a model provider (reopened from #728).
The SAP Generative AI Hub provides a proxy for commercial models such as OpenAI and the ability to provide your own models. OAuth is always used for authentication, i.e. if you use OpenAI models via the Generative AI Hub, you do not need an API key, but the OAuth token.
In this PR, I have slightly modified the OpenAI class and introduced protected methods for determining the URLs and for generating the request headers. Based on the modified class, I added a SAPGenAI class that adapts the two methods for the Gen AI Hub.
ToDos:
azure
openai/apiType
does not requireengine
+apiKey
and theopenai
type does not requireapiKey
.