feat: Multi-API format support (OpenAI Chat, Response API, Anthropic)#43
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- Define InternalMessage, InternalRequest, InternalResponse types - Define InternalStreamChunk for streaming response handling - Add UpstreamAdapter interface for provider communication - Add RequestAdapter/ResponseAdapter interfaces for format conversion - Implement adapter factory with getRequestAdapter, getResponseAdapter, getUpstreamAdapter functions Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add request adapters to convert incoming requests to internal format: - openai-chat.ts: OpenAI Chat Completion format - openai-response.ts: OpenAI Response API format - anthropic.ts: Anthropic Messages API format Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add response adapters to convert internal responses to client formats: - openai-chat.ts: Internal → OpenAI Chat Completion format - openai-response.ts: Internal → OpenAI Response API format - anthropic.ts: Internal → Anthropic Messages API format Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add upstream adapters for building requests to different providers: - openai.ts: Build requests for OpenAI-compatible APIs - openai-responses.ts: Build requests for OpenAI Response API - anthropic.ts: Build requests for Anthropic Claude API Also adds tools.ts for cross-format tool/function calling conversion. Includes SSE parsing fixes to handle both "data: " and "data:" formats for compatibility with various providers (e.g., Alibaba DashScope). Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Add 'anthropic' and 'openai-responses' to provider_type enum - Add api_version column to providers table (for Anthropic version header) - Add request_format column to completions table - Add raw_request JSONB column to store original request data Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Add POST /v1/messages endpoint for Anthropic Messages API compatibility - Add POST /v1/responses endpoint for OpenAI Response API compatibility - Register new routes in api/index.ts Both endpoints support streaming and non-streaming modes with full format conversion to/from internal representation. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Refactor /v1/chat/completions to use the new adapter pattern for handling different upstream provider types (OpenAI, Anthropic, OpenAI Responses). Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Support both authentication methods: - Authorization: Bearer <token> (OpenAI style) - x-api-key: <token> (Anthropic style) This allows Anthropic SDK clients to authenticate with NexusGate using their native authentication header format. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Support apiVersion field for Anthropic providers - Update provider testing to handle different provider types - Adjust model discovery for Anthropic and Response API providers Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Add 'Anthropic' and 'OpenAI Responses' options to provider type selector - Add API Version input field for Anthropic providers - Update provider columns to display new types - Add i18n translations for new provider types (en-US, zh-CN) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Local Python test scripts for manual API testing. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
koitococo
reviewed
Jan 13, 2026
Backend changes: - Extract common API helpers to backend/src/utils/api-helpers.ts - extractUpstreamHeaders, selectModel, extractContentText - parseModelProvider, PROVIDER_HEADER, EXCLUDED_HEADERS - Replace t.Unknown() with specific type schemas in API endpoints - completions.ts: add tStreamOptions schema - messages.ts: add Anthropic content block, tool, and metadata types - responses.ts: add Response API input, tool, and metadata types Frontend changes: - Extract PROVIDER_TYPES constant to frontend/src/constants/providers.ts - Add PROVIDER_TYPE_LABELS for display names - Add requiresApiVersion() and getApiVersionPlaceholder() helpers - Update provider components to use shared constants This reduces code duplication and improves type safety. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Add "reasoning" to ResponseApiOutput.type union (fixes TS2367) - Add @ts-expect-error for TextDecoderStream.pipeThrough compatibility issue in 4 SSE parser locations (fixes TS2345) - Remove unused @ts-expect-error directive in utils.ts (fixes TS2578) Backend now passes tsc --noEmit with no errors. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Fix JSDoc tag in api-helpers.ts (changed @Provider to description) - Remove unnecessary type argument in sse.ts - Add @ts-expect-error for Eden type imports in frontend api.ts Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Jan 13, 2026
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Summary
This PR implements full multi-API format support for NexusGate, enabling:
Key Changes
Adapter Pattern Architecture: Introduced a clean adapter pattern with:
New API Endpoints:
POST /v1/messages- Anthropic Messages API compatible endpointPOST /v1/responses- OpenAI Response API compatible endpointAuthentication: Support for both
Authorization: Bearer(OpenAI) andx-api-key(Anthropic) headersDatabase Schema: Extended to support new provider types and track request formats
Frontend: Added provider type selection and API version configuration
API Format Support Matrix
Commits (11 atomic commits)
feat(adapters): add internal unified types and adapter factoryfeat(adapters): add request adapters for all API formatsfeat(adapters): add response adapters for all API formatsfeat(adapters): add upstream adapters and tool conversion utilitiesfeat(db): extend schema for multi-API format supportfeat(api): add Anthropic Messages and OpenAI Response API endpointsrefactor(api): update completions endpoint to use adapter patternfeat(auth): add x-api-key header support for Anthropic SDKfeat(admin): update provider management for new provider typesfeat(ui): add provider type selection and API version configchore: add python_test_code to gitignoreTest plan
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