initial commits

src/nexus_claude_api/server.py

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+from __future__ import annotations
+
+import logging
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.requests import Request
+from fastapi.responses import JSONResponse
+
+from nexus_claude_api.config import Settings
+from nexus_claude_api.errors import NexusClaudeError, anthropic_error_response
+from nexus_claude_api.nexus_client import NexusClient
+from nexus_claude_api.routes.health import router as health_router
+from nexus_claude_api.routes.messages import router as messages_router
+from nexus_claude_api.routes.models import router as models_router
+
+
+def create_app(
+    settings: Settings | None = None,
+    nexus_client: NexusClient | None = None,
+) -> FastAPI:
+    resolved_settings = settings or Settings.from_values(require_api_key=False)
+    app = FastAPI(title="nexus-claude-api", version="0.1.0")
+    app.state.settings = resolved_settings
+    app.state.nexus_client = nexus_client or NexusClient(resolved_settings)
+
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=["*"],
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+
+    app.include_router(health_router)
+    app.include_router(models_router)
+    app.include_router(messages_router)
+
+    @app.exception_handler(NexusClaudeError)
+    async def handle_nexus_error(_: Request, exc: NexusClaudeError) -> JSONResponse:
+        return anthropic_error_response(
+            exc.message,
+            status_code=exc.status_code,
+            error_type=exc.error_type,
+        )
+
+    logging.basicConfig(
+        level=logging.DEBUG if resolved_settings.verbose else logging.INFO,
+        format="%(asctime)s %(levelname)s %(name)s: %(message)s",
+    )
+    return app
+