import os import json import uuid from datetime import datetime from flask import Flask, request, Response, jsonify import socketio import requests import logging from threading import Event import re # 创建 Flask 应用 app = Flask(__name__) # 自定义日志格式 log_format = "%(asctime)s - %(levelname)s - %(name)s - %(message)s" logging.basicConfig(level=logging.INFO, format=log_format) # 创建不同的日志记录器 app_logger = logging.getLogger('app') sio_logger = logging.getLogger('socketio.client') engineio_logger = logging.getLogger('engineio.client') # 调整日志级别，隐藏过多的调试信息 sio_logger.setLevel(logging.WARNING) engineio_logger.setLevel(logging.WARNING) # 从环境变量中获取 API 密钥 API_KEY = os.environ.get('PPLX_KEY') # 代理设置 proxy_url = os.environ.get('PROXY_URL') if proxy_url: proxies = { 'http': proxy_url, 'https': proxy_url } transport = requests.Session() transport.proxies.update(proxies) else: transport = None sio = socketio.Client(http_session=transport, logger=sio_logger, engineio_logger=engineio_logger) # 连接选项 connect_opts = { 'transports': ['websocket', 'polling'], # 允许回退到轮询 } # 其他选项 sio_opts = { 'extraHeaders': { 'Cookie': os.environ.get('PPLX_COOKIE'), 'User-Agent': os.environ.get('USER_AGENT'), 'Accept': '*/*', 'priority': 'u=1, i', 'Referer': 'https://www.perplexity.ai/', } } def log_request(ip, route, status): timestamp = datetime.now().isoformat() app_logger.info(f"{timestamp} - {ip} - {route} - {status}") def validate_api_key(): api_key = request.headers.get('x-api-key') if api_key != API_KEY: log_request(request.remote_addr, request.path, 401) return create_json_response({"error": "Invalid API key"}), 401 return None def normalize_content(content): """ 递归处理 msg['content']，确保其为字符串。 如果 content 是字典或列表，将其转换为字符串。 """ if isinstance(content, str): return content elif isinstance(content, dict): return json.dumps(content, ensure_ascii=False) elif isinstance(content, list): return " ".join([normalize_content(item) for item in content]) else: return "" def calculate_tokens(text): """ 改进的 token 计算方法。 - 对于英文和有空格的文本，使用空格分词。 - 对于中文等没有空格的文本，使用字符级分词。 """ if re.search(r'[^\x00-\x7F]', text): return len(text) else: tokens = text.split() return len(tokens) def create_json_response(data): """创建一个JSON响应，并在发送之前记录它""" json_str = json.dumps(data, ensure_ascii=False) app_logger.info(f"Sending JSON response: {json_str}") return Response(json_str, content_type='application/json') @app.route('/') def root(): log_request(request.remote_addr, request.path, 200) return create_json_response({ "message": "Welcome to the Perplexity AI Proxy API", "endpoints": { "/ai/v1/messages": { "method": "POST", "description": "Send a message to the AI", "headers": { "x-api-key": "Your API key (required)", "Content-Type": "application/json" }, "body": { "messages": "Array of message objects", "stream": "Boolean (true for streaming response)", "model": "Model to be used (optional, defaults to claude-3-opus-20240229)" } } } }) @app.route('/ai/v1/messages', methods=['POST']) def messages(): auth_error = validate_api_key() if auth_error: return auth_error try: json_body = request.json model = json_body.get('model', 'claude-3-opus-20240229') stream = json_body.get('stream', True) previous_messages = "\n\n".join([normalize_content(msg['content']) for msg in json_body['messages']]) input_tokens = calculate_tokens(previous_messages) msg_id = str(uuid.uuid4()) response_event = Event() response_text = [] if not stream: return handle_non_stream(previous_messages, msg_id, model, input_tokens) log_request(request.remote_addr, request.path, 200) def generate(): try: yield create_event("message_start", { "type": "message_start", "message": { "id": msg_id, "type": "message", "role": "assistant", "content": [], "model": model, "stop_reason": None, "stop_sequence": None, "usage": {"input_tokens": input_tokens, "output_tokens": 1}, }, }) yield create_event("content_block_start", {"type": "content_block_start", "index": 0, "content_block": {"type": "text", "text": ""}}) yield create_event("ping", {"type": "ping"}) def on_connect(): app_logger.info("Connected to Perplexity AI") emit_data = { "version": "2.9", "source": "default", "attachments": [], "language": "en-GB", "timezone": "Europe/London", "mode": "concise", "is_related_query": False, "is_default_related_query": False, "visitor_id": str(uuid.uuid4()), "frontend_context_uuid": str(uuid.uuid4()), "prompt_source": "user", "query_source": "home" } sio.emit('perplexity_ask', (previous_messages, emit_data)) def on_query_progress(data): nonlocal response_text if 'text' in data: text = json.loads(data['text']) chunk = text['chunks'][-1] if text['chunks'] else None if chunk: response_text.append(chunk) if data.get('final', False): response_event.set() def on_disconnect(): app_logger.info("Disconnected from Perplexity AI") response_event.set() def on_connect_error(data): app_logger.error(f"Connection error: {data}") response_text.append(f"Error connecting to Perplexity AI: {data}") response_event.set() sio.on('connect', on_connect) sio.on('query_progress', on_query_progress) sio.on('disconnect', on_disconnect) sio.on('connect_error', on_connect_error) sio.connect('wss://www.perplexity.ai/', **connect_opts, headers=sio_opts['extraHeaders']) while not response_event.is_set(): sio.sleep(0.1) while response_text: chunk = response_text.pop(0) app_logger.info(f"Returning chunk to client: {chunk}") yield create_event("content_block_delta", { "type": "content_block_delta", "index": 0, "delta": {"type": "text_delta", "text": chunk}, }) output_tokens = calculate_tokens(''.join(response_text)) yield create_event("content_block_stop", {"type": "content_block_stop", "index": 0}) yield create_event("message_delta", { "type": "message_delta", "delta": {"stop_reason": "end_turn", "stop_sequence": None}, "usage": {"input_tokens": input_tokens, "output_tokens": output_tokens}, }) yield create_event("message_stop", {"type": "message_stop"}) except Exception as e: app_logger.error(f"Error in generate function: {str(e)}") yield create_event("error", {"type": "error", "message": str(e)}) finally: if sio.connected: sio.disconnect() return Response(generate(), content_type='text/event-stream') except Exception as e: app_logger.error(f"Request error: {str(e)}") log_request(request.remote_addr, request.path, 400) return create_json_response({"error": str(e)}), 400 def handle_non_stream(previous_messages, msg_id, model, input_tokens): try: response_event = Event() response_text = [] def on_connect(): app_logger.info("Connected to Perplexity AI") emit_data = { "version": "2.9", "source": "default", "attachments": [], "language": "en-GB", "timezone": "Europe/London", "mode": "concise", "is_related_query": False, "is_default_related_query": False, "visitor_id": str(uuid.uuid4()), "frontend_context_uuid": str(uuid.uuid4()), "prompt_source": "user", "query_source": "home" } sio.emit('perplexity_ask', (previous_messages, emit_data)) def on_query_progress(data): nonlocal response_text if 'text' in data: text = json.loads(data['text']) chunk = text['chunks'][-1] if text['chunks'] else None if chunk: response_text.append(chunk) if data.get('final', False): response_event.set() def on_disconnect(): app_logger.info("Disconnected from Perplexity AI") response_event.set() def on_connect_error(data): app_logger.error(f"Connection error: {data}") response_text.append(f"Error connecting to Perplexity AI: {data}") response_event.set() sio.on('connect', on_connect) sio.on('query_progress', on_query_progress) sio.on('disconnect', on_disconnect) sio.on('connect_error', on_connect_error) sio.connect('wss://www.perplexity.ai/', **connect_opts, headers=sio_opts['extraHeaders']) response_event.wait(timeout=30) output_tokens = calculate_tokens(''.join(response_text)) full_response = { "content": [{"text": ''.join(response_text), "type": "text"}], "id": msg_id, "model": model, "role": "assistant", "stop_reason": "end_turn", "stop_sequence": None, "type": "message", "usage": { "input_tokens": input_tokens, "output_tokens": output_tokens, }, } return create_json_response(full_response) except Exception as e: app_logger.error(f"Error during socket connection: {str(e)}") return create_json_response({"error": str(e)}), 500 finally: if sio.connected: sio.disconnect() @app.errorhandler(404) def not_found(error): log_request(request.remote_addr, request.path, 404) return create_json_response({"error": "Not Found"}), 404 @app.errorhandler(500) def server_error(error): app_logger.error(f"Server error: {str(error)}") log_request(request.remote_addr, request.path, 500) return create_json_response({"error": "Internal Server Error"}), 500 def create_event(event, data): if isinstance(data, dict): data = json.dumps(data, ensure_ascii=False) event_str = f"event: {event}\ndata: {data}\n\n" app_logger.info(f"Sending SSE event: {event_str}") return event_str if __name__ == '__main__': port = int(os.environ.get('PORT', 8081)) app_logger.info(f"Perplexity proxy listening on port {port}") if not API_KEY: app_logger.warning("Warning: PPLX_KEY environment variable is not set. API key validation will fail.") app.run(host='0.0.0.0', port=port)