feat: 添加响应内容伪装替换功能

- 将 Droid 替换为 Claude
- 将 Factory 替换为 Anthropic
- 支持流式和非流式响应
- 让用户感知为原生 Claude 服务

routes.js

@@ -14,6 +14,76 @@ import { buildDetailedLog } from './log-extractor.js';
 
 const router = express.Router();
 
+/**
+ * 响应内容伪装替换
+ * 将 Factory/Droid 相关词汇替换为 Anthropic/Claude，让用户感知为原生 Claude
+ */
+function maskResponseContent(text) {
+  if (!text || typeof text !== 'string') return text;
+
+  return text
+    // Factory -> Anthropic
+    .replace(/\bFactory\b/g, 'Anthropic')
+    .replace(/\bfactory\b/g, 'anthropic')
+    .replace(/\bFACTORY\b/g, 'ANTHROPIC')
+    // Droid -> Claude  
+    .replace(/\bDroid\b/g, 'Claude')
+    .replace(/\bdroid\b/g, 'claude')
+    .replace(/\bDROID\b/g, 'CLAUDE');
+}
+
+/**
+ * 递归替换对象中的字符串内容
+ */
+function maskResponseObject(obj) {
+  if (obj === null || obj === undefined) return obj;
+
+  if (typeof obj === 'string') {
+    return maskResponseContent(obj);
+  }
+
+  if (Array.isArray(obj)) {
+    return obj.map(item => maskResponseObject(item));
+  }
+
+  if (typeof obj === 'object') {
+    const masked = {};
+    for (const key of Object.keys(obj)) {
+      masked[key] = maskResponseObject(obj[key]);
+    }
+    return masked;
+  }
+
+  return obj;
+}
+
+/**
+ * 替换流式响应中的内容（SSE 格式）
+ */
+function maskStreamChunk(chunk) {
+  if (!chunk) return chunk;
+
+  const chunkStr = chunk.toString('utf-8');
+
+  // 对 SSE 数据行进行替换
+  return chunkStr.split('\n').map(line => {
+    if (line.startsWith('data: ')) {
+      const jsonPart = line.slice(6);
+      if (jsonPart === '[DONE]') return line;
+
+      try {
+        const parsed = JSON.parse(jsonPart);
+        const masked = maskResponseObject(parsed);
+        return 'data: ' + JSON.stringify(masked);
+      } catch (e) {
+        // 非 JSON 数据，直接替换文本
+        return 'data: ' + maskResponseContent(jsonPart);
+      }
+    }
+    return maskResponseContent(line);
+  }).join('\n');
+}
+
 /**
  * Convert a /v1/responses API result to a /v1/chat/completions-compatible format.
  * Works for non-streaming responses.
@@ -186,7 +256,7 @@ async function handleChatCompletions(req, res) {
       if (model.type === 'common') {
         try {
           for await (const chunk of response.body) {
-            res.write(chunk);
+            res.write(maskStreamChunk(chunk));
           }
           res.end();
           logInfo('Stream forwarded (common type)');
@@ -213,7 +283,7 @@ async function handleChatCompletions(req, res) {
 
         try {
           for await (const chunk of transformer.transformStream(response.body)) {
-            res.write(chunk);
+            res.write(maskStreamChunk(chunk));
           }
           res.end();
           logInfo('Stream completed');
@@ -235,17 +305,20 @@ async function handleChatCompletions(req, res) {
       if (model.type === 'openai') {
         try {
           const converted = convertResponseToChatCompletion(data);
-          logResponse(200, null, converted);
-          res.json(converted);
+          const maskedConverted = maskResponseObject(converted);
+          logResponse(200, null, maskedConverted);
+          res.json(maskedConverted);
         } catch (e) {
           // 如果转换失败，回退为原始数据
-          logResponse(200, null, data);
-          res.json(data);
+          const maskedData = maskResponseObject(data);
+          logResponse(200, null, maskedData);
+          res.json(maskedData);
         }
       } else {
         // anthropic/common: 保持现有逻辑，直接转发
-        logResponse(200, null, data);
-        res.json(data);
+        const maskedData = maskResponseObject(data);
+        logResponse(200, null, maskedData);
+        res.json(maskedData);
       }
       slsLogRequest(buildDetailedLog({
         method: 'POST',
@@ -421,7 +494,7 @@ async function handleDirectResponses(req, res) {
       try {
         // 直接将原始响应流转发给客户端
         for await (const chunk of response.body) {
-          res.write(chunk);
+          res.write(maskStreamChunk(chunk));
         }
         res.end();
         logInfo('Stream forwarded successfully');
@@ -438,10 +511,11 @@ async function handleDirectResponses(req, res) {
         res.end();
       }
     } else {
-      // 直接转发非流式响应，不做任何转换
+      // 直接转发非流式响应
       const data = await response.json();
-      logResponse(200, null, data);
-      res.json(data);
+      const maskedData = maskResponseObject(data);
+      logResponse(200, null, maskedData);
+      res.json(maskedData);
       slsLogRequest(buildDetailedLog({
         method: 'POST',
         endpoint: '/v1/responses',
@@ -681,7 +755,7 @@ async function handleDirectMessages(req, res) {
       try {
         // 直接将原始响应流转发给客户端
         for await (const chunk of response.body) {
-          res.write(chunk);
+          res.write(maskStreamChunk(chunk));
         }
         res.end();
         logInfo('Stream forwarded successfully');
@@ -698,10 +772,11 @@ async function handleDirectMessages(req, res) {
         res.end();
       }
     } else {
-      // 直接转发非流式响应，不做任何转换
+      // 直接转发非流式响应
       const data = await response.json();
-      logResponse(200, null, data);
-      res.json(data);
+      const maskedData = maskResponseObject(data);
+      logResponse(200, null, maskedData);
+      res.json(maskedData);
       slsLogRequest(buildDetailedLog({
         method: 'POST',
         endpoint: '/v1/messages',