ChatGPT是什么？
先了解GTP,摘自官网的一段话“A set of models that can understand and generate natural language”，其实，就是一个自然语言处理的模型。所以ChatGPT顾名思义就是基于GPT3的一个聊天AI。
但是想让他做苦力帮忙写代码的话所需要的其实不是这个模型，而是Codex这个模型，按照官网所说“Most capable Codex model. Particularly good at translating natural language to code. In addition to completing code, also supports inserting completions within code.”。真的是碉堡了！
准备
第一步：注册OpenAI账号
因为对大陆以及中国香港地区不开放，所以我们需要小小的科学一下。
来一个我就是参照着申请账号的园子的文章:
https://www.cnblogs.com/chatgpt/p/how-to-register-chatgpt-in-china.html
当然手机那里可以淘宝找，几块钱就能帮忙注册手机，账号里面默认还有18美元余额。
注意点：如果搭建了科学还是提示不对你的国家提供服务的话，尝试清空浏览器缓存或者打开浏览器的无痕窗口。
Chrome默认在右上角三个点打开就能找到“打开新的无痕式窗口”。
万事具备，直接撸代码
1、网页获取所需token和cookie
我们需要三个东西：UserAgent，CfClearance，Session_token
我们需要先打开ChatGPT官方网站：https://chat.openai.com/chat 然后按下F12打开浏览器的开发者模式
UserAgent在网络里（只需要复制UserAgent：后面的值）：
CfClearance和Session_token在应用程序->cookie里面
2、创建一个session用来表示一个会话
public OpenAISession(string session_token,string cfClearance,string userAgent){ Session_token = session_token; CfClearance = cfClearance; UserAgent = userAgent; Headers = new Dictionary<string, string>(); Cookies = new Dictionary<string, string>(); Proxies = new Dictionary<string, string>();}
Session可以刷新自己的AccessToken和Session_token
public async Task RefreshSessionAsync(){ if (string.IsNullOrEmpty(Session_token)) { throw new Exception("No tokens provided"); } // Set cookies Cookies.Put("__Secure-next-auth.session-token", Session_token); Cookies.Put("cf_clearance", CfClearance); string cookiesString = GetCookiesString(); Dictionary<string, string> map = new Dictionary<string, string>(); Headers.Put("User-Agent", UserAgent); Headers.Put("cookie", cookiesString); Headers.Put("Cookie", cookiesString); var response = await GetAsync("https://chat.openai.com/api/auth/session"); if (!response.IsSuccessStatusCode) { Console.WriteLine("err code: " + response.StatusCode); Console.WriteLine("cf_clearance: " + CfClearance); Console.WriteLine("token: " + Session_token); Console.WriteLine("userAgent: " + UserAgent); Console.WriteLine("请检查以上参数是否正确，是否过期。"); throw new Exception("无法获取token!请重试"); } try { string name = "__Secure-next-auth.session-token="; var cookies = response.Headers.GetValues("Set-Cookie"); var stoken = cookies.FirstOrDefault(x => x.StartsWith(name)); Session_token = stoken == null ? Session_token : stoken.Substring(name.Length, stoken.IndexOf(";") - name.Length); Cookies.Put("__Secure-next-auth.session-token", Session_token); var result = await response.Content.ReadAsStringAsync(); AccessToken = JsonSerializer.Deserialize(result, _jsonSerializerOptions)?.AccessToken; RefreshHeaders(); } catch (Exception ex) { Console.WriteLine($"Error {nameof(RefreshSessionAsync)}:{ex}"); throw new Exception($"Error {nameof(RefreshSessionAsync)}", ex); }}
获取到的最新的AccessToken更新到header里，Session_token更新到cookie里
private void RefreshHeaders(){ Headers.Put("Host", "chat.openai.com"); Headers.Put("Accept", "text/event-stream"); Headers.Put("Authorization", $"Bearer {AccessToken}"); Headers.Put("User-Agent", UserAgent); Headers.Put("X-Openai-Assistant-App-Id", string.Empty); Headers.Put("Connection", "close"); Headers.Put("Accept-Language", "en-US,en;q=0.9"); Headers.Put("Referer", "https://chat.openai.com/chat");}string name = "__Secure-next-auth.session-token=";var cookies = response.Headers.GetValues("Set-Cookie");var stoken = cookies.FirstOrDefault(x => x.StartsWith(name));Session_token = stoken == null ? Session_token : stoken.Substring(name.Length, stoken.IndexOf(";") - name.Length);Cookies.Put("__Secure-next-auth.session-token", Session_token);
3、创建机器人绑定一个会话
public Chatbot(OpenAISession openAISession){ OpenAISession = openAISession; ResetConversation();}/// /// 重置Conversation，开启一个新的会话/// public void ResetConversation() { _conversationId = null; _parentMessageId = Guid.NewGuid().ToString();}
如何保持上下文聊天以及多用户隔离？
上下文聊天已经内置，会自动与机器人的回复进行关联，当需要重新开启一个对话的时候，可以调用ResetConversation，这样对应的机器人对象发过去就是开启了一个新的对话。
如何多用户隔离？比如联合微信机器人使用，可以将一个人或者一个群对应一个Chatbot对象，并且利用id与机器人做关联。
当然这个_clientID需要使用者做唯一性管理
//可以作为隔离不同客户端聊天上下文的凭据，即一个机器人绑定一个客户端//客户端编号可以是，微信id,qq id,飞书id,亦或者自己开发的软件的用户idprivate readonly string _clientID; public Chatbot(OpenAISession openAISession, string clientID){ OpenAISession = openAISession; _clientID = clientID == null ? Guid.NewGuid().ToString() : clientID; ResetConversation();}
最后构造对话对象，发送到对应api
public async Task GetChatReplyAsync(string prompt){ var conversation = new Conversation(); conversation.Conversation_id = _conversationId; conversation.Parent_message_id = _parentMessageId; conversation.Messages = new Message[] { new Message() { Content = new Content { Parts = new string []{ prompt } } } }; return await GetChatResponseAsync(conversation);}/// /// 获取响应/// /// /// /// 服务器返回非200private async Task GetChatResponseAsync(Conversation conversation){ using (var client = new HttpClient()) { var response = await OpenAISession.PostAsync(_conversation, JsonSerializer.Serialize(conversation, _jsonSerializerOptions)); if (!response.IsSuccessStatusCode) { throw new Exception($"Faild to request.StatusCode:{response.StatusCode}"); } var msg = await response.Content.ReadAsStringAsync(); var data = msg.Split("\n")?.ToList().Where(x => !string.IsNullOrEmpty(x) && !x.Contains("data: [DONE]")).LastOrDefault()?.Substring(5); var reply = JsonSerializer.Deserialize(data, _jsonSerializerOptions); _conversationId = reply.Conversation_id; return reply; }}
效果截图（仅测试）
OpenAISession openAIOptions = new OpenAISession(Session_token, CfClearance, UserAgent);await openAIOptions.RefreshSessionAsync();Chatbot chatbot = new Chatbot(openAIOptions);Console.WriteLine("用c++写个冒泡查询");var reply = await chatbot.GetChatReplyAsync("用c++写个冒泡查询");Console.WriteLine(reply.Message.Content.Parts.FirstOrDefault());
源码（欢迎star）https://github.com/BruceQiu1996/NChatGPTRev
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