feat: openAI Files API Implementation#1982

Draft

sivanantha321 wants to merge 18 commits intoenvoyproxy:mainfrom

sivanantha321:openai-file-api

Commits on Mar 23, 2026

Add OpenAI File API types
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Add multipart file marshal function
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Implement create file endpoint
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Add Marshal, Unmarshal and NoOpMetrics
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feat: Add retrieve, delete endpoints
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Add extra parameters support and ID encoding/decoding functions for OpenAI Files API
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feat: route file requests via encoded IDs
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refactor: update regex path handling to use pointers for better memory management
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feat: add multipart unmarshal tests for FileNewParams and update expires_after handling
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refactor: rename Route to RouteProcessorMapper and update related references
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feat: implement tracing for file operations and add unit tests for recorders
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feat: add file processing and retrieval functionality
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refactor: rename noopMetrics to noOpMetrics for consistency and clarity; add unit tests for noOpMetrics
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add end-to-end tests for file upload, retrieval, and deletion in testupstream
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