feat: refactor extra_body handling for improved configuration parsing

relay/channel/gemini/relay-gemini.go

@@ -229,13 +229,14 @@ func CovertOpenAI2Gemini(c *gin.Context, textRequest dto.GeneralOpenAIRequest, i
 
 	// patch extra_body
 	if len(textRequest.ExtraBody) > 0 {
-		if !strings.HasSuffix(info.UpstreamModelName, "-nothinking") {
 		var extraBody map[string]interface{}
 		if err := common.Unmarshal(textRequest.ExtraBody, &extraBody); err != nil {
 			return nil, fmt.Errorf("invalid extra body: %w", err)
 		}
+
 		// eg. {"google":{"thinking_config":{"thinking_budget":5324,"include_thoughts":true}}}
 		if googleBody, ok := extraBody["google"].(map[string]interface{}); ok {
+			if !strings.HasSuffix(info.UpstreamModelName, "-nothinking") {
 				adaptorWithExtraBody = true
 				// check error param name like thinkingConfig, should be thinking_config
 				if _, hasErrorParam := googleBody["thinkingConfig"]; hasErrorParam {
@@ -247,15 +248,58 @@ func CovertOpenAI2Gemini(c *gin.Context, textRequest dto.GeneralOpenAIRequest, i
 					if _, hasErrorParam := thinkingConfig["thinkingBudget"]; hasErrorParam {
 						return nil, errors.New("extra_body.google.thinking_config.thinkingBudget is not supported, use extra_body.google.thinking_config.thinking_budget instead")
 					}
-					if budget, ok := thinkingConfig["thinking_budget"].(float64); ok {
-						budgetInt := int(budget)
-						geminiRequest.GenerationConfig.ThinkingConfig = &dto.GeminiThinkingConfig{
-							ThinkingBudget:  common.GetPointer(budgetInt),
-							IncludeThoughts: true,
+					var hasThinkingConfig bool
+					var tempThinkingConfig dto.GeminiThinkingConfig
+
+					if thinkingBudget, exists := thinkingConfig["thinking_budget"]; exists {
+						switch v := thinkingBudget.(type) {
+						case float64:
+							budgetInt := int(v)
+							tempThinkingConfig.ThinkingBudget = common.GetPointer(budgetInt)
+							if budgetInt > 0 {
+								// 有正数预算
+								tempThinkingConfig.IncludeThoughts = true
+							} else {
+								// 存在但为0或负数，禁用思考
+								tempThinkingConfig.IncludeThoughts = false
 							}
+							hasThinkingConfig = true
+						default:
+							return nil, errors.New("extra_body.google.thinking_config.thinking_budget must be an integer")
+						}
+					}
+
+					if includeThoughts, exists := thinkingConfig["include_thoughts"]; exists {
+						if v, ok := includeThoughts.(bool); ok {
+							tempThinkingConfig.IncludeThoughts = v
+							hasThinkingConfig = true
 						} else {
-						geminiRequest.GenerationConfig.ThinkingConfig = &dto.GeminiThinkingConfig{
-							IncludeThoughts: true,
+							return nil, errors.New("extra_body.google.thinking_config.include_thoughts must be a boolean")
+						}
+					}
+					if thinkingLevel, exists := thinkingConfig["thinking_level"]; exists {
+						if v, ok := thinkingLevel.(string); ok {
+							tempThinkingConfig.ThinkingLevel = v
+							hasThinkingConfig = true
+						} else {
+							return nil, errors.New("extra_body.google.thinking_config.thinking_level must be a string")
+						}
+					}
+
+					if hasThinkingConfig {
+						// 避免 panic: 仅在获得配置时分配，防止后续赋值时空指针
+						if geminiRequest.GenerationConfig.ThinkingConfig == nil {
+							geminiRequest.GenerationConfig.ThinkingConfig = &tempThinkingConfig
+						} else {
+							// 如果已分配，则合并内容
+							if tempThinkingConfig.ThinkingBudget != nil {
+								geminiRequest.GenerationConfig.ThinkingConfig.ThinkingBudget = tempThinkingConfig.ThinkingBudget
+							}
+							geminiRequest.GenerationConfig.ThinkingConfig.IncludeThoughts = tempThinkingConfig.IncludeThoughts
+							if tempThinkingConfig.ThinkingLevel != "" {
+								geminiRequest.GenerationConfig.ThinkingConfig.ThinkingLevel = tempThinkingConfig.ThinkingLevel
+							}
+						}
 					}
 				}
 			}
@@ -294,7 +338,6 @@ func CovertOpenAI2Gemini(c *gin.Context, textRequest dto.GeneralOpenAIRequest, i
 			}
 		}
 	}
-	}
 
 	if !adaptorWithExtraBody {
 		ThinkingAdaptor(&geminiRequest, info, textRequest)