refactor: Reduce code duplication in files/main.py using provider credential helpers

[Chesars]

Summary

litellm/files/main.py has significant code duplication. Each function (create_file, file_retrieve, file_delete, file_list, file_content) repeats nearly identical credential/configuration logic for each provider.

Provider	create_file	file_retrieve	file_delete	file_list	file_content
OpenAI	~20 lines	~20 lines	~20 lines	~20 lines	~20 lines
Azure	~20 lines	~20 lines	~20 lines	~20 lines	~20 lines
Vertex	~15 lines	-	-	-	~15 lines
Anthropic	~5 lines ✓	~5 lines ✓	~5 lines ✓	~5 lines ✓	~5 lines ✓

Estimated ~400+ lines of repeated code that could be reduced significantly with helpers.

Proposed Solution

Create get_api_credentials() helpers in each provider's common_utils.py, similar to what was done for Anthropic in PR #16594:

# Example: litellm/llms/openai/common_utils.py
class OpenAIModelInfo:
    @staticmethod
    def get_api_credentials(api_base=None, api_key=None, organization=None):
        # centralized logic here
        return api_base, api_key, organization

In PR #16594, Anthropic's file operations were refactored:

• Before: ~60 lines of repeated credential logic
• After: ~20 lines using AnthropicModelInfo.get_api_credentials()

The same approach could reduce OpenAI and Azure code by similar amounts.

Files

• litellm/files/main.py
• litellm/llms/openai/common_utils.py
• litellm/llms/azure/common_utils.py

[geethsai0507]

I'd like to work on this issue! Could you please assign it to me?

[Chesars]

I'd like to work on this issue! Could you please assign it to me?

Hi @geethsai0507 I can't assign issues, but of course you can take it, would be great.