import asyncio import base64 import json import logging import os import re import shutil import subprocess import tempfile import uuid from typing import Optional from fastapi import FastAPI, HTTPException, Request, Security, File, UploadFile from fastapi.middleware.cors import CORSMiddleware from fastapi.responses import JSONResponse, StreamingResponse, Response from fastapi.security import APIKeyHeader from pydantic import BaseModel from geoip import get_ip_location_text from llm import call_ollama, call_vlm_ocr from prompt import build_completion_prompts, prepare_prompt_context import markitdown logging.basicConfig( level=logging.INFO, format="%(asctime)s %(levelname)s %(name)s - %(message)s", ) logger = logging.getLogger("api") app = FastAPI() ACTIVE_COMPLETIONS: dict[str, asyncio.Task] = {} ACTIVE_COMPLETIONS_LOCK = asyncio.Lock() app.add_middleware( CORSMiddleware, allow_origins=["*"], allow_credentials=True, allow_methods=["*"], allow_headers=["*", "X-API-Key", "X-Client-IP", "X-Request-Id"], ) API_KEY = "your-secret-key-here" api_key_header = APIKeyHeader(name="X-API-Key") async def get_api_key(api_key: str = Security(api_key_header)): if api_key != API_KEY: raise HTTPException( status_code=403, detail="Could not validate credentials", ) return api_key class UserPreferences(BaseModel): language: str = "auto" currency: str = "auto" timezone: str = "auto" class CompletionRequest(BaseModel): prefix: str suffix: str languageId: str = "markdown" model_thinking: str = "low" privacy_mode: bool = False user_preferences: Optional[UserPreferences] = None class CancelCompletionRequest(BaseModel): request_id: str reason: str = "abort" class OCRRequest(BaseModel): image: str filename: str = "image.jpg" language: str = "auto" class ConvertRequest(BaseModel): file: str filename: str = "document.pdf" ALLOWED_CONVERT_EXTENSIONS = {".txt", ".docx", ".pptx", ".pdf"} IMAGE_MARKDOWN_RE = re.compile(r"!\[[^\]]*]\([^)]+\)") IMAGE_HTML_RE = re.compile(r"]*>", re.IGNORECASE) def _convert_docx_to_pdf(input_path: str, output_path: str) -> None: node_executable = shutil.which("node") if not node_executable: raise RuntimeError("未找到 Node.js，无法转换 DOCX 为 PDF") bridge_path = os.path.join(os.path.dirname(__file__), "docx2pdf_bridge.cjs") if not os.path.exists(bridge_path): raise RuntimeError("缺少 DOCX 转 PDF 桥接脚本") result = subprocess.run( [node_executable, bridge_path, input_path, output_path], cwd=os.path.dirname(os.path.dirname(__file__)), capture_output=True, text=True, ) if result.returncode != 0: error_text = (result.stderr or result.stdout or "DOCX 转 PDF 失败").strip() raise RuntimeError(error_text) def _preview(text: str, limit: int = 80) -> str: value = (text or "").replace("\n", "\\n") if len(value) <= limit: return value return value[:limit] + "..." def _sanitize_converted_markdown(text: str) -> str: value = (text or "").replace("\r\n", "\n").replace("\r", "\n") value = IMAGE_MARKDOWN_RE.sub("", value) value = IMAGE_HTML_RE.sub("", value) value = re.sub(r"\n{3,}", "\n\n", value) return value.strip() def _sse_payload(payload: dict) -> str: return f"data: {json.dumps(payload)}\n\n" def get_client_ip(request: Request) -> str: if request.client: return request.headers.get("X-Client-IP") or request.client.host return request.headers.get("X-Client-IP") or "unknown" @app.post("/v1/completions") async def create_completion(request: Request, req: CompletionRequest, api_key: str = Security(get_api_key)): request_id = request.headers.get("X-Request-Id") or str(uuid.uuid4()) request_tag = request_id[:8] inference_task: Optional[asyncio.Task] = None client_ip = "hidden" location = "" if not req.privacy_mode: client_ip = get_client_ip(request) location = get_ip_location_text(client_ip) if location: logger.info("[%s] client_location=%s", request_tag, location) try: logger.info( "[%s] /v1/completions request_id=%s client_ip=%s prefix_chars=%d suffix_chars=%d lang=%s thinking=%s privacy=%s", request_tag, request_id, client_ip, len(req.prefix or ""), len(req.suffix or ""), req.languageId, req.model_thinking, req.privacy_mode, ) llm_prefix, llm_suffix = prepare_prompt_context(req.prefix or "", req.suffix or "") logger.info("[%s] llm_input_prefix=%r", request_tag, llm_prefix) logger.info("[%s] llm_input_suffix=%r", request_tag, llm_suffix) system_prompt, user_prompt = build_completion_prompts( req.prefix, req.suffix, req.languageId, location=location, thinking_level=req.model_thinking, preferences=req.user_preferences, ) inference_task = asyncio.create_task( call_ollama( user_prompt, system_prompt=system_prompt, tag=f"{request_tag}-primary", temperature=0.7, thinking=req.model_thinking if req.model_thinking != "none" else None, ) ) async with ACTIVE_COMPLETIONS_LOCK: existing = ACTIVE_COMPLETIONS.get(request_id) if existing and not existing.done(): existing.cancel() ACTIVE_COMPLETIONS[request_id] = inference_task result = await inference_task content = result["content"] or "" if not content.strip(): logger.warning("[%s] primary returned empty content, returning empty result", request_tag) logger.info( "[%s] completion resolved source=primary request_id=%s content_chars=%d content_preview='%s'", request_tag, request_id, len(content), _preview(content, 120), ) async def generate(): yield _sse_payload({"content": content}) yield _sse_payload({"done": True}) return StreamingResponse(generate(), media_type="text/event-stream") except asyncio.CancelledError: logger.info("[%s] /v1/completions cancelled request_id=%s", request_tag, request_id) async def cancelled(): yield _sse_payload({"cancelled": True, "request_id": request_id, "done": True}) return StreamingResponse(cancelled(), media_type="text/event-stream") except Exception as e: logger.exception("[%s] /v1/completions failed request_id=%s: %s", request_tag, request_id, e) return JSONResponse(content={"error": str(e)}, status_code=500) finally: async with ACTIVE_COMPLETIONS_LOCK: active = ACTIVE_COMPLETIONS.get(request_id) if active is not None and active is inference_task: ACTIVE_COMPLETIONS.pop(request_id, None) @app.post("/v1/completions/cancel") async def cancel_completion(req: CancelCompletionRequest, api_key: str = Security(get_api_key)): request_tag = str(uuid.uuid4())[:8] request_id = req.request_id or "" async with ACTIVE_COMPLETIONS_LOCK: task = ACTIVE_COMPLETIONS.get(request_id) if task is None: logger.info( "[%s] /v1/completions/cancel request_id=%s status=not_found reason=%s", request_tag, request_id, req.reason, ) return {"cancelled": False, "status": "not_found"} if task.done(): logger.info( "[%s] /v1/completions/cancel request_id=%s status=already_done reason=%s", request_tag, request_id, req.reason, ) return {"cancelled": False, "status": "already_done"} task.cancel() logger.info( "[%s] /v1/completions/cancel request_id=%s status=ok reason=%s", request_tag, request_id, req.reason, ) return {"cancelled": True, "status": "ok"} @app.post("/v1/ocr") async def ocr_image(request: OCRRequest, api_key: str = Security(get_api_key)): request_id = str(uuid.uuid4())[:8] try: logger.info( "[%s] /v1/ocr filename=%s language=%s image_base64_chars=%d", request_id, request.filename, request.language, len(request.image or ""), ) image_bytes = base64.b64decode(request.image) logger.info("[%s] /v1/ocr decoded image_bytes=%d", request_id, len(image_bytes)) result = await call_vlm_ocr(image_bytes, request.language) logger.info( "[%s] /v1/ocr success text_chars=%d text_preview='%s'", request_id, len(result or ""), _preview(result or "", 120), ) return {"text": result, "filename": request.filename} except Exception as e: logger.exception("[%s] /v1/ocr failed: %s", request_id, e) return JSONResponse(content={"error": str(e)}, status_code=500) @app.post("/v1/convert") async def convert_to_markdown(request: ConvertRequest, api_key: str = Security(get_api_key)): """Convert file to markdown""" request_id = str(uuid.uuid4())[:8] try: logger.info( "[%s] /v1/convert filename=%s file_base64_chars=%d", request_id, request.filename, len(request.file or ""), ) # Decode base64 file_bytes = base64.b64decode(request.file) logger.info("[%s] /v1/convert decoded file_bytes=%d", request_id, len(file_bytes)) # Get file extension ext = os.path.splitext(request.filename)[1].lower() if ext not in ALLOWED_CONVERT_EXTENSIONS: raise ValueError("仅支持 txt、docx、pptx、pdf 格式") if ext == ".txt": markdown_text = _sanitize_converted_markdown(file_bytes.decode("utf-8", errors="ignore")) return { "markdown": markdown_text, "filename": request.filename } # Create temporary file with tempfile.NamedTemporaryFile(delete=False, suffix=ext) as tmp: tmp.write(file_bytes) tmp_path = tmp.name try: # Convert using MarkItDown md = markitdown.MarkItDown() result = md.convert(tmp_path) markdown_text = _sanitize_converted_markdown(result.text_content) logger.info( "[%s] /v1/convert success text_chars=%d text_preview='%s'", request_id, len(markdown_text or ""), _preview(markdown_text, 120), ) return { "markdown": markdown_text, "filename": request.filename } finally: # Clean up temporary file if os.path.exists(tmp_path): os.unlink(tmp_path) except Exception as e: logger.exception("[%s] /v1/convert failed: %s", request_id, e) return JSONResponse(content={"error": str(e)}, status_code=500) @app.post("/v1/export/pdf") async def export_pdf(file: UploadFile = File(...), api_key: str = Security(get_api_key)): request_id = str(uuid.uuid4())[:8] original_name = file.filename or "document.docx" base_name = os.path.splitext(original_name)[0] or "document" try: file_bytes = await file.read() logger.info( "[%s] /v1/export/pdf filename=%s file_bytes=%d", request_id, original_name, len(file_bytes), ) with tempfile.TemporaryDirectory() as temp_dir: input_path = os.path.join(temp_dir, f"{base_name}.docx") output_path = os.path.join(temp_dir, f"{base_name}.pdf") with open(input_path, "wb") as tmp_file: tmp_file.write(file_bytes) await asyncio.to_thread(_convert_docx_to_pdf, input_path, output_path) if not os.path.exists(output_path): raise RuntimeError("PDF 转换后未生成输出文件") with open(output_path, "rb") as pdf_file: pdf_bytes = pdf_file.read() logger.info("[%s] /v1/export/pdf success pdf_bytes=%d", request_id, len(pdf_bytes)) headers = { "Content-Disposition": f'attachment; filename="{base_name}.pdf"', } return Response(content=pdf_bytes, media_type="application/pdf", headers=headers) except Exception as e: logger.exception("[%s] /v1/export/pdf failed: %s", request_id, e) return JSONResponse(content={"error": str(e)}, status_code=500) if __name__ == "__main__": import uvicorn uvicorn.run(app, host="0.0.0.0", port=8001) # TTS and ASR routes from tts_asr import register_tts_asr_routes register_tts_asr_routes(app)