fix: 修复 OpenAI 兼容路由的 Claude API 认证和 Function Calling 支持

- 添加必需的系统消息 "You are Claude Code, Anthropic's official CLI for Claude."
- 修改 anthropic-beta header 为 OAuth-only 模式 (oauth-2025-04-20)
- 不再传递客户端 headers，使用固定的 4 个必需 headers
- 增强流式响应的 Function Calling 支持，正确处理 tool_use 事件
- 支持自定义 beta header 参数，允许不同路由使用不同的认证模式

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/routes/openaiClaudeRoutes.js

@@ -221,12 +221,12 @@ async function handleChatCompletion(req, res, apiKeyData) {
         }
       });
       
-      // 使用转换后的响应流
+      // 使用转换后的响应流 (使用 OAuth-only beta header，不传递客户端 headers)
       await claudeRelayService.relayStreamRequestWithUsageCapture(
         claudeRequest, 
         apiKeyData, 
         res, 
-        req.headers,
+        {},
         (usage) => {
           // 记录使用统计
           if (usage && usage.input_tokens !== undefined && usage.output_tokens !== undefined) {
@@ -251,20 +251,22 @@ async function handleChatCompletion(req, res, apiKeyData) {
         // 流转换器
         (chunk) => {
           return openaiToClaude.convertStreamChunk(chunk, req.body.model);
-        }
+        },
+        { betaHeader: 'oauth-2025-04-20' }
       );
       
     } else {
       // 非流式请求
       logger.info(`📄 Processing OpenAI non-stream request for model: ${req.body.model}`);
       
-      // 发送请求到 Claude
+      // 发送请求到 Claude (使用 OAuth-only beta header，不传递客户端 headers)
       const claudeResponse = await claudeRelayService.relayRequest(
         claudeRequest, 
         apiKeyData, 
         req, 
         res, 
-        req.headers
+        {},
+        { betaHeader: 'oauth-2025-04-20' }
       );
       
       // 解析 Claude 响应

src/services/claudeRelayService.js

@@ -18,7 +18,7 @@ class ClaudeRelayService {
   }
 
   // 🚀 转发请求到Claude API
-  async relayRequest(requestBody, apiKeyData, clientRequest, clientResponse, clientHeaders) {
+  async relayRequest(requestBody, apiKeyData, clientRequest, clientResponse, clientHeaders, options = {}) {
     let upstreamRequest = null;
     
     try {
@@ -89,7 +89,8 @@ class ClaudeRelayService {
         accessToken, 
         proxyAgent,
         clientHeaders,
-        (req) => { upstreamRequest = req; }
+        (req) => { upstreamRequest = req; },
+        options
       );
       
       // 移除监听器（请求成功完成）
@@ -325,7 +326,7 @@ class ClaudeRelayService {
   }
 
   // 🔗 发送请求到Claude API
-  async _makeClaudeRequest(body, accessToken, proxyAgent, clientHeaders, onRequest) {
+  async _makeClaudeRequest(body, accessToken, proxyAgent, clientHeaders, onRequest, requestOptions = {}) {
     return new Promise((resolve, reject) => {
       const url = new URL(this.claudeApiUrl);
       
@@ -352,8 +353,10 @@ class ClaudeRelayService {
         options.headers['User-Agent'] = 'claude-cli/1.0.53 (external, cli)';
       }
 
-      if (this.betaHeader) {
+      // 使用自定义的 betaHeader 或默认值
-        options.headers['anthropic-beta'] = this.betaHeader;
+      const betaHeader = requestOptions?.betaHeader !== undefined ? requestOptions.betaHeader : this.betaHeader;
+      if (betaHeader) {
+        options.headers['anthropic-beta'] = betaHeader;
       }
 
       const req = https.request(options, (res) => {
@@ -445,7 +448,7 @@ class ClaudeRelayService {
   }
 
   // 🌊 处理流式响应（带usage数据捕获）
-  async relayStreamRequestWithUsageCapture(requestBody, apiKeyData, responseStream, clientHeaders, usageCallback, streamTransformer = null) {
+  async relayStreamRequestWithUsageCapture(requestBody, apiKeyData, responseStream, clientHeaders, usageCallback, streamTransformer = null, options = {}) {
     try {
       // 调试日志：查看API Key数据（流式请求）
       logger.info('🔍 [Stream] API Key data received:', {
@@ -495,7 +498,7 @@ class ClaudeRelayService {
       const proxyAgent = await this._getProxyAgent(accountId);
       
       // 发送流式请求并捕获usage数据
-      return await this._makeClaudeStreamRequestWithUsageCapture(processedBody, accessToken, proxyAgent, clientHeaders, responseStream, usageCallback, accountId, sessionHash, streamTransformer);
+      return await this._makeClaudeStreamRequestWithUsageCapture(processedBody, accessToken, proxyAgent, clientHeaders, responseStream, usageCallback, accountId, sessionHash, streamTransformer, options);
     } catch (error) {
       logger.error('❌ Claude stream relay with usage capture failed:', error);
       throw error;
@@ -503,7 +506,7 @@ class ClaudeRelayService {
   }
 
   // 🌊 发送流式请求到Claude API（带usage数据捕获）
-  async _makeClaudeStreamRequestWithUsageCapture(body, accessToken, proxyAgent, clientHeaders, responseStream, usageCallback, accountId, sessionHash, streamTransformer = null) {
+  async _makeClaudeStreamRequestWithUsageCapture(body, accessToken, proxyAgent, clientHeaders, responseStream, usageCallback, accountId, sessionHash, streamTransformer = null, requestOptions = {}) {
     return new Promise((resolve, reject) => {
       const url = new URL(this.claudeApiUrl);
       
@@ -530,8 +533,10 @@ class ClaudeRelayService {
         options.headers['User-Agent'] = 'claude-cli/1.0.53 (external, cli)';
       }
 
-      if (this.betaHeader) {
+      // 使用自定义的 betaHeader 或默认值
-        options.headers['anthropic-beta'] = this.betaHeader;
+      const betaHeader = requestOptions?.betaHeader !== undefined ? requestOptions.betaHeader : this.betaHeader;
+      if (betaHeader) {
+        options.headers['anthropic-beta'] = betaHeader;
       }
 
       const req = https.request(options, (res) => {
@@ -736,7 +741,7 @@ class ClaudeRelayService {
   }
 
   // 🌊 发送流式请求到Claude API
-  async _makeClaudeStreamRequest(body, accessToken, proxyAgent, clientHeaders, responseStream) {
+  async _makeClaudeStreamRequest(body, accessToken, proxyAgent, clientHeaders, responseStream, requestOptions = {}) {
     return new Promise((resolve, reject) => {
       const url = new URL(this.claudeApiUrl);
       
@@ -763,8 +768,10 @@ class ClaudeRelayService {
         options.headers['User-Agent'] = 'claude-cli/1.0.53 (external, cli)';
       }
 
-      if (this.betaHeader) {
+      // 使用自定义的 betaHeader 或默认值
-        options.headers['anthropic-beta'] = this.betaHeader;
+      const betaHeader = requestOptions?.betaHeader !== undefined ? requestOptions.betaHeader : this.betaHeader;
+      if (betaHeader) {
+        options.headers['anthropic-beta'] = betaHeader;
       }
 
       const req = https.request(options, (res) => {

src/services/openaiToClaude.js

@@ -358,10 +358,29 @@ class OpenAIToClaudeConverter {
     if (event.type === 'content_block_start' && event.content_block) {
       if (event.content_block.type === 'text') {
         baseChunk.choices[0].delta.content = event.content_block.text || '';
+      } else if (event.content_block.type === 'tool_use') {
+        // 开始工具调用
+        baseChunk.choices[0].delta.tool_calls = [{
+          index: event.index || 0,
+          id: event.content_block.id,
+          type: 'function',
+          function: {
+            name: event.content_block.name,
+            arguments: ''
+          }
+        }];
       }
     } else if (event.type === 'content_block_delta' && event.delta) {
       if (event.delta.type === 'text_delta') {
         baseChunk.choices[0].delta.content = event.delta.text || '';
+      } else if (event.delta.type === 'input_json_delta') {
+        // 工具调用参数的增量更新
+        baseChunk.choices[0].delta.tool_calls = [{
+          index: event.index || 0,
+          function: {
+            arguments: event.delta.partial_json || ''
+          }
+        }];
       }
     } else if (event.type === 'message_delta' && event.delta) {
       if (event.delta.stop_reason) {