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smgc commited on Nov 15, 2024

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Create main.py

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+import asyncio
+import json
+import sys
+import uuid
+import base64
+import re
+import os
+import argparse
+from datetime import datetime, timezone
+from typing import List, Optional
+import httpx
+import uvicorn
+from fastapi import (
+    BackgroundTasks,
+    FastAPI,
+    HTTPException,
+    Request,
+    Response,
+    status,
+)
+from fastapi.responses import HTMLResponse, JSONResponse, StreamingResponse
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.staticfiles import StaticFiles
+from bearer_token import BearerTokenGenerator
+# 模型列表
+MODELS = ["gpt-4o", "gpt-4o-mini", "claude-3-5-sonnet", "claude"]
+# 默认端口
+INITIAL_PORT = 3000
+# 外部API的URL
+EXTERNAL_API_URL = "https://api.chaton.ai/chats/stream"
+# 初始化FastAPI应用
+app = FastAPI()
+# 添加CORS中间件
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],  # 允许所有来源
+    allow_credentials=True,
+    allow_methods=["GET", "POST", "OPTIONS"],  # 允许GET, POST, OPTIONS方法
+    allow_headers=["Content-Type", "Authorization"],  # 允许的头部
+)
+# 挂载静态文件路由以提供 images 目录的内容
+app.mount("/images", StaticFiles(directory="images"), name="images")
+# 辅助函数
+def send_error_response(message: str, status_code: int = 400):
+    """构建错误响应，并确保包含CORS头"""
+    error_json = {"error": message}
+    headers = {
+        "Access-Control-Allow-Origin": "*",
+        "Access-Control-Allow-Methods": "GET, POST, OPTIONS",
+        "Access-Control-Allow-Headers": "Content-Type, Authorization",
+    }
+    return JSONResponse(status_code=status_code, content=error_json, headers=headers)
+def extract_path_from_markdown(markdown: str) -> Optional[str]:
+    """
+    提取 Markdown 图片链接中的路径，匹配以 https://spc.unk/ 开头的 URL
+    """
+    pattern = re.compile(r'!\[.*?\]\(https://spc\.unk/(.*?)\)')
+    match = pattern.search(markdown)
+    if match:
+        return match.group(1)
+    return None
+async def fetch_get_url_from_storage(storage_url: str) -> Optional[str]:
+    """
+    从 storage URL 获取 JSON 并提取 getUrl
+    """
+    async with httpx.AsyncClient() as client:
+        try:
+            response = await client.get(storage_url)
+            if response.status_code != 200:
+                print(f"获取 storage URL 失败，状态码: {response.status_code}")
+                return None
+            json_response = response.json()
+            return json_response.get("getUrl")
+        except Exception as e:
+            print(f"Error fetching getUrl from storage: {e}")
+            return None
+async def download_image(image_url: str) -> Optional[bytes]:
+    """
+    下载图像
+    """
+    async with httpx.AsyncClient() as client:
+        try:
+            response = await client.get(image_url)
+            if response.status_code == 200:
+                return response.content
+            else:
+                print(f"下载图像失败，状态码: {response.status_code}")
+                return None
+        except Exception as e:
+            print(f"Error downloading image: {e}")
+            return None
+def save_base64_image(base64_str: str, images_dir: str = "images") -> str:
+    """
+    将Base64编码的图片保存到images目录，返回文件名
+    """
+    if not os.path.exists(images_dir):
+        os.makedirs(images_dir)
+    image_data = base64.b64decode(base64_str)
+    filename = f"{uuid.uuid4()}.png"  # 默认保存为png格式
+    file_path = os.path.join(images_dir, filename)
+    with open(file_path, "wb") as f:
+        f.write(image_data)
+    return filename
+def is_base64_image(url: str) -> bool:
+    """
+    判断URL是否为Base64编码的图片
+    """
+    return url.startswith("data:image/")
+# 根路径GET请求处理
+@app.get("/", response_class=HTMLResponse)
+async def read_root():
+    """返回欢迎页面"""
+    html_content = """
+    <html>
+        <head>
+            <title>Welcome to API</title>
+        </head>
+        <body>
+            <h1>Welcome to API</h1>
+            <p>This API is used to interact with the ChatGPT model. You can send messages to the model and receive responses.</p>
+        </body>
+    </html>
+    """
+    return HTMLResponse(content=html_content, status_code=200)
+# 聊天完成处理
+@app.post("/v1/chat/completions")
+async def chat_completions(request: Request, background_tasks: BackgroundTasks):
+    """
+    处理聊天完成请求
+    """
+    try:
+        request_body = await request.json()
+    except json.JSONDecodeError:
+        raise HTTPException(status_code=400, detail="Invalid JSON")
+    # 打印接收到的请求
+    print("Received Completion JSON:", json.dumps(request_body, ensure_ascii=False))
+    # 处理消息内容
+    messages = request_body.get("messages", [])
+    temperature = request_body.get("temperature", 1.0)
+    top_p = request_body.get("top_p", 1.0)
+    max_tokens = request_body.get("max_tokens", 8000)
+    model = request_body.get("model", "gpt-4o")
+    is_stream = request_body.get("stream", False)  # 获取 stream 字段
+    has_image = False
+    has_text = False
+    # 清理和提取消息内容
+    cleaned_messages = []
+    for message in messages:
+        content = message.get("content", "")
+        if isinstance(content, list):
+            text_parts = []
+            images = []
+            for item in content:
+                if "text" in item:
+                    text_parts.append(item.get("text", ""))
+                elif "image_url" in item:
+                    has_image = True
+                    image_info = item.get("image_url", {})
+                    url = image_info.get("url", "")
+                    if is_base64_image(url):
+                        # 解码并保存图片
+                        base64_str = url.split(",")[1]
+                        filename = save_base64_image(base64_str)
+                        base_url = app.state.base_url
+                        image_url = f"{base_url}/images/{filename}"
+                        images.append({"data": image_url})
+                    else:
+                        images.append({"data": url})
+            extracted_content = " ".join(text_parts).strip()
+            if extracted_content:
+                has_text = True
+                message["content"] = extracted_content
+                if images:
+                    message["images"] = images
+                cleaned_messages.append(message)
+                print("Extracted:", extracted_content)
+            else:
+                if images:
+                    has_image = True
+                    message["content"] = ""
+                    message["images"] = images
+                    cleaned_messages.append(message)
+                    print("Extracted image only.")
+                else:
+                    print("Deleted message with empty content.")
+        elif isinstance(content, str):
+            content_str = content.strip()
+            if content_str:
+                has_text = True
+                message["content"] = content_str
+                cleaned_messages.append(message)
+                print("Retained content:", content_str)
+            else:
+                print("Deleted message with empty content.")
+        else:
+            print("Deleted non-expected type of content message.")
+    if not cleaned_messages:
+        raise HTTPException(status_code=400, detail="所有消息的内容均为空。")
+    # 验证模型
+    if model not in MODELS:
+        model = "gpt-4o"
+    # 构建新的请求JSON
+    new_request_json = {
+        "function_image_gen": False,
+        "function_web_search": True,
+        "max_tokens": max_tokens,
+        "model": model,
+        "source": "chat/free",
+        "temperature": temperature,
+        "top_p": top_p,
+        "messages": cleaned_messages,
+    }
+    modified_request_body = json.dumps(new_request_json, ensure_ascii=False)
+    print("Modified Request JSON:", modified_request_body)
+    # 获取Bearer Token
+    tmp_token = BearerTokenGenerator.get_bearer(modified_request_body)
+    if not tmp_token:
+        raise HTTPException(status_code=500, detail="无法生成 Bearer Token")
+    bearer_token, formatted_date = tmp_token
+    headers = {
+        "Date": formatted_date,
+        "Client-time-zone": "-05:00",
+        "Authorization": bearer_token,
+        "User-Agent": "ChatOn_Android/1.53.502",
+        "Accept-Language": "en-US",
+        "X-Cl-Options": "hb",
+        "Content-Type": "application/json; charset=UTF-8",
+    }
+    if is_stream:
+        # 流式响应处理
+        async def event_generator():
+            async with httpx.AsyncClient(timeout=None) as client_stream:
+                try:
+                    async with client_stream.stream("POST", EXTERNAL_API_URL, headers=headers, content=modified_request_body) as streamed_response:
+                        async for line in streamed_response.aiter_lines():
+                            if line.startswith("data: "):
+                                data = line[6:].strip()
+                                if data == "[DONE]":
+                                    # 通知客户端流结束
+                                    yield "data: [DONE]\n\n"
+                                    break
+                                try:
+                                    sse_json = json.loads(data)
+                                    if "choices" in sse_json:
+                                        for choice in sse_json["choices"]:
+                                            delta = choice.get("delta", {})
+                                            content = delta.get("content")
+                                            if content:
+                                                new_sse_json = {
+                                                    "choices": [
+                                                        {
+                                                            "index": choice.get("index", 0),
+                                                            "delta": {"content": content},
+                                                        }
+                                                    ],
+                                                    "created": sse_json.get(
+                                                        "created", int(datetime.now(timezone.utc).timestamp())
+                                                    ),
+                                                    "id": sse_json.get(
+                                                        "id", str(uuid.uuid4())
+                                                    ),
+                                                    "model": sse_json.get("model", "gpt-4o"),
+                                                    "system_fingerprint": f"fp_{uuid.uuid4().hex[:12]}",
+                                                }
+                                                new_sse_line = f"data: {json.dumps(new_sse_json, ensure_ascii=False)}\n\n"
+                                                yield new_sse_line
+                                except json.JSONDecodeError:
+                                    print("JSON解析错误")
+                                    continue
+                except httpx.RequestError as exc:
+                    print(f"外部API请求失败: {exc}")
+                    yield f"data: {{\"error\": \"外部API请求失败: {str(exc)}\"}}\n\n"
+        return StreamingResponse(
+            event_generator(),
+            media_type="text/event-stream",
+            headers={
+                "Cache-Control": "no-cache",
+                "Connection": "keep-alive",
+                # CORS头已通过中间件处理，无需在这里重复添加
+            },
+        )
+    else:
+        # 非流式响应处理
+        async with httpx.AsyncClient(timeout=None) as client:
+            try:
+                response = await client.post(
+                    EXTERNAL_API_URL,
+                    headers=headers,
+                    content=modified_request_body,
+                    timeout=None
+                )
+                if response.status_code != 200:
+                    raise HTTPException(
+                        status_code=response.status_code,
+                        detail=f"API 错误: {response.status_code}",
+                    )
+                sse_lines = response.text.splitlines()
+                content_builder = ""
+                images_urls = []
+                for line in sse_lines:
+                    if line.startswith("data: "):
+                        data = line[6:].strip()
+                        if data == "[DONE]":
+                            break
+                        try:
+                            sse_json = json.loads(data)
+                            if "choices" in sse_json:
+                                for choice in sse_json["choices"]:
+                                    if "delta" in choice:
+                                        delta = choice["delta"]
+                                        if "content" in delta:
+                                            content_builder += delta["content"]
+                        except json.JSONDecodeError:
+                            print("JSON解析错误")
+                            continue
+                openai_response = {
+                    "id": f"chatcmpl-{uuid.uuid4()}",
+                    "object": "chat.completion",
+                    "created": int(datetime.now(timezone.utc).timestamp()),
+                    "model": model,
+                    "choices": [
+                        {
+                            "index": 0,
+                            "message": {
+                                "role": "assistant",
+                                "content": content_builder,
+                            },
+                            "finish_reason": "stop",
+                        }
+                    ],
+                }
+                # 处理图片（如果有）
+                if has_image:
+                    images = []
+                    for message in cleaned_messages:
+                        if "images" in message:
+                            for img in message["images"]:
+                                images.append({"data": img["data"]})
+                    openai_response["choices"][0]["message"]["images"] = images
+                return JSONResponse(content=openai_response, status_code=200)
+            except httpx.RequestError as exc:
+                raise HTTPException(status_code=500, detail=f"请求失败: {str(exc)}")
+            except Exception as exc:
+                raise HTTPException(status_code=500, detail=f"内部服务器错误: {str(exc)}")
+# 图像生成处理
+@app.post("/v1/images/generations")
+async def images_generations(request: Request):
+    """
+    处理图像生成请求
+    """
+    try:
+        request_body = await request.json()
+    except json.JSONDecodeError:
+        return send_error_response("Invalid JSON", status_code=400)
+    print("Received Image Generations JSON:", json.dumps(request_body, ensure_ascii=False))
+    # 验证必需的字段
+    if "prompt" not in request_body:
+        return send_error_response("缺少必需的字段: prompt", status_code=400)
+    user_prompt = request_body.get("prompt", "").strip()
+    response_format = request_body.get("response_format", "b64_json").strip()
+    if not user_prompt:
+        return send_error_response("Prompt 不能为空。", status_code=400)
+    print(f"Prompt: {user_prompt}")
+    # 构建新的 TextToImage JSON 请求体
+    text_to_image_json = {
+        "function_image_gen": True,
+        "function_web_search": True,
+        "image_aspect_ratio": "1:1",
+        "image_style": "photographic",  # 暂时固定 image_style
+        "max_tokens": 8000,
+        "messages": [
+            {
+                "content": "You are a helpful artist, please based on imagination draw a picture.",
+                "role": "system"
+            },
+            {
+                "content": "Draw: " + user_prompt,
+                "role": "user"
+            }
+        ],
+        "model": "gpt-4o",  # 固定 model，只能gpt-4o或gpt-4o-mini
+        "source": "chat/pro_image"  # 固定 source
+    }
+    modified_request_body = json.dumps(text_to_image_json, ensure_ascii=False)
+    print("Modified Request JSON:", modified_request_body)
+    # 获取Bearer Token
+    tmp_token = BearerTokenGenerator.get_bearer(modified_request_body, path="/chats/stream")
+    if not tmp_token:
+        return send_error_response("无法生成 Bearer Token", status_code=500)
+    bearer_token, formatted_date = tmp_token
+    headers = {
+        "Date": formatted_date,
+        "Client-time-zone": "-05:00",
+        "Authorization": bearer_token,
+        "User-Agent": "ChatOn_Android/1.53.502",
+        "Accept-Language": "en-US",
+        "X-Cl-Options": "hb",
+        "Content-Type": "application/json; charset=UTF-8",
+    }
+    async with httpx.AsyncClient(timeout=None) as client:
+        try:
+            response = await client.post(
+                EXTERNAL_API_URL, headers=headers, content=modified_request_body, timeout=None
+            )
+            if response.status_code != 200:
+                return send_error_response(f"API 错误: {response.status_code}", status_code=500)
+            # 初始化用于拼接 URL 的字符串
+            url_builder = ""
+            # 读取 SSE 流并拼接 URL
+            async for line in response.aiter_lines():
+                if line.startswith("data: "):
+                    data = line[6:].strip()
+                    if data == "[DONE]":
+                        break
+                    try:
+                        sse_json = json.loads(data)
+                        if "choices" in sse_json:
+                            for choice in sse_json["choices"]:
+                                delta = choice.get("delta", {})
+                                content = delta.get("content")
+                                if content:
+                                    url_builder += content
+                    except json.JSONDecodeError:
+                        print("JSON解析错误")
+                        continue
+            image_markdown = url_builder
+            # Step 1: 检查Markdown文本是否为空
+            if not image_markdown:
+                print("无法从 SSE 流中构建图像 Markdown。")
+                return send_error_response("无法从 SSE 流中构建图像 Markdown。", status_code=500)
+            # Step 2, 3, 4, 5: 处理图像
+            extracted_path = extract_path_from_markdown(image_markdown)
+            if not extracted_path:
+                print("无法从 Markdown 中提取路径。")
+                return send_error_response("无法从 Markdown 中提取路径。", status_code=500)
+            print(f"提取的路径: {extracted_path}")
+            # Step 5: 拼接最终的存储URL
+            storage_url = f"https://api.chaton.ai/storage/{extracted_path}"
+            print(f"存储URL: {storage_url}")
+            # 获取最终下载URL
+            final_download_url = await fetch_get_url_from_storage(storage_url)
+            if not final_download_url:
+                return send_error_response("无法从 storage URL 获取最终下载链接。", status_code=500)
+            print(f"Final Download URL: {final_download_url}")
+            # 下载图像
+            image_bytes = await download_image(final_download_url)
+            if not image_bytes:
+                return send_error_response("无法从 URL 下载图像。", status_code=500)
+            # 转换为 Base64
+            image_base64 = base64.b64encode(image_bytes).decode('utf-8')
+            # 将图片保存到images目录并构建可访问的URL
+            filename = save_base64_image(image_base64)
+            base_url = app.state.base_url
+            accessible_url = f"{base_url}/images/{filename}"
+            # 根据 response_format 返回相应的响应
+            if response_format.lower() == "b64_json":
+                response_json = {
+                    "data": [
+                        {
+                            "b64_json": image_base64
+                        }
+                    ]
+                }
+                return JSONResponse(content=response_json, status_code=200)
+            else:
+                # 构建包含可访问URL的响应
+                response_json = {
+                    "data": [
+                        {
+                            "url": accessible_url
+                        }
+                    ]
+                }
+                return JSONResponse(content=response_json, status_code=200)
+        except httpx.RequestError as exc:
+            print(f"请求失败: {exc}")
+            return send_error_response(f"请求失败: {str(exc)}", status_code=500)
+        except Exception as exc:
+            print(f"内部服务器错误: {exc}")
+            return send_error_response(f"内部服务器错误: {str(exc)}", status_code=500)
+# 运行服务器
+def main():
+    parser = argparse.ArgumentParser(description="启动ChatOn API服务器")
+    parser.add_argument('--base_url', type=str, default='http://localhost', help='Base URL for accessing images')
+    parser.add_argument('--port', type=int, default=INITIAL_PORT, help='服务器监听端口')
+    args = parser.parse_args()
+    base_url = args.base_url
+    port = args.port
+    # 确保 images 目录存在
+    if not os.path.exists("images"):
+        os.makedirs("images")
+    # 设置 FastAPI 应用的 state
+    app.state.base_url = base_url
+    print(f"Server started on port {port} with base_url: {base_url}")
+    # 运行FastAPI应用
+    uvicorn.run(app, host="0.0.0.0", port=port)
+async def get_available_port(start_port: int = INITIAL_PORT, end_port: int = 65535) -> int:
+    """查找可用的端口号"""
+    for port in range(start_port, end_port + 1):
+        try:
+            server = await asyncio.start_server(lambda r, w: None, host="0.0.0.0", port=port)
+            server.close()
+            await server.wait_closed()
+            return port
+        except OSError:
+            continue
+    raise RuntimeError(f"No available ports between {start_port} and {end_port}")
+if __name__ == "__main__":
+    main()