修改OpenAI原格式的转发逻辑和参数

LMS.service/Service/ForwardWordService.cs

@@ -9,6 +9,7 @@ using LMS.Repository.Model;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
 using System.Net;
 using System.Net.Http.Headers;
 using System.Text;
@@ -238,15 +239,16 @@ public class ForwardWordService(ApplicationDbContext context, IHttpClientFactory
     #endregion
     #region OpenAI 格式流式返回接口（保留接口），需要系统数据
 
-    public async Task<HttpResponseMessage> ForwardWordStreamRaw(ForwardModel request)
+    public async Task<HttpResponseMessage> ForwardWordStreamRaw(ForwardModelOpenAI request)
     {
         // --- 1. 基础校验 (保持原有逻辑) ---
-        if (string.IsNullOrEmpty(request.Word)) throw new Exception("参数错误");
+        if (string.IsNullOrWhiteSpace(request.OpenAIBodyString))
+        {
+            throw new Exception("OpenAIBodyString 不能为空");
+        }
         if (string.IsNullOrEmpty(request.GptUrl)) throw new Exception("请求的url为空");
 
         var allowedUrls = new[] {
-        "https://ark.cn-beijing.volces.com",
-        "https://api.moonshot.cn",
         "https://laitool.net",
         "https://api.laitool.cc",
         "https://laitool.cc",
@@ -266,6 +268,24 @@ public class ForwardWordService(ApplicationDbContext context, IHttpClientFactory
             throw new Exception("机器码不存在或已过期");
         }
 
+        // ================= 2. JSON 结构解析与校验 =================
+        JObject jsonBody;
+        try
+        {
+            jsonBody = JObject.Parse(request.OpenAIBodyString);
+        }
+        catch (JsonReaderException)
+        {
+            throw new Exception("OpenAIBodyString 不是有效的 JSON 格式");
+        }
+
+        // 检查 messages 是否存在且为数组
+        var messages = jsonBody["messages"] as JArray;
+        if (messages == null || messages.Count == 0)
+        {
+            throw new Exception("请求体结构错误: 缺少 'messages' 数组");
+        }
+
         // --- 2. 获取提示词预设 (保持原有逻辑) ---
         Prompt? prompt = await _context.Prompt.FirstOrDefaultAsync(x => x.PromptTypeId == request.PromptTypeId && x.Id == request.PromptId);
         if (prompt == null)
@@ -273,23 +293,35 @@ public class ForwardWordService(ApplicationDbContext context, IHttpClientFactory
             throw new Exception("FindPromptStringFail"); // 建议使用具体错误码
         }
 
-        // --- 3. 手动构建 OpenAI 格式的请求体 ---
-        // SDK 帮你做了这一步，现在我们要自己做，以便获得原始流
-        var payload = new
+        // ================= 4. 替换逻辑 (System) =================
+        // 遍历寻找 role 为 system 的消息
+        var systemMsg = messages.FirstOrDefault(m => m["role"]?.ToString() == "system");
+        if (systemMsg != null)
         {
-            model = request.Model,
-            messages = new List<object>
+            // 没有数据 默认为 "{{SYSTEM}}"
+            var content = systemMsg["content"]?.ToString() ?? "{{SYSTEM}}";
+            // 检查是否包含占位符 "{{SYSTEM}}"
+            if (content.Contains("{{SYSTEM}}"))
+            {
+                // 替换占位符为真实的 promptString
+                systemMsg["content"] = content.Replace("{{SYSTEM}}", prompt.PromptString);
+            }
+        }
+        else
         {
-            new { role = "system", content = prompt.PromptString },
-            new { role = "user", content = request.Word }
-        },
-            stream = true, // 必须开启流式
-                           // max_tokens = 2000, // 如果有需要可以加其他参数
-                           // temperature = 0.7
-        };
+            throw new Exception("缺少 system 消息节点");
+        }
 
-        var jsonContent = JsonConvert.SerializeObject(payload, new JsonSerializerSettings { ContractResolver = new LowercaseContractResolver() });
-        var httpContent = new StringContent(jsonContent, Encoding.UTF8, "application/json");
+        // ================= 5. 强制修正关键字段 =================
+        // 强制使用 C# 模型类中指定的 Model，或者校验两者是否一致 (这里选择覆盖，以 C# 参数为准)
+        jsonBody["model"] = request.Model;
+
+        // 强制开启流式
+        jsonBody["stream"] = true;
+        var finalJsonContent = jsonBody.ToString(Formatting.None);
+
+        //var jsonContent = JsonConvert.SerializeObject(finalJsonContent, new JsonSerializerSettings { ContractResolver = new LowercaseContractResolver() });
+        var httpContent = new StringContent(finalJsonContent, Encoding.UTF8, "application/json");
 
         // --- 4. 发起 HTTP 请求 ---
         var client = _httpClientFactory.CreateClient(); // 或者直接 new HttpClient();