refactor(channel): 抽取渠道映射公共函数 + OpenAI映射到body + 空响应修复 + 清理日志

- 抽取 ResolveChannelMappingAndRestrict 统一入口（5处→1个方法）
- 抽取 BuildModelMappingChain 到 ChannelMappingResult 方法（5处→1行调用）
- OpenAI 三入口 Forward 前应用渠道映射到请求体
- OpenAI Responses/Messages 限制检查添加错误响应
- 清理前端 3 处 console.log 调试日志

backend/internal/handler/gateway_handler.go

@@ -158,19 +158,12 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 	reqStream := parsedReq.Stream
 	reqLog = reqLog.With(zap.String("model", reqModel), zap.Bool("stream", reqStream))
 
-	// 解析渠道级模型映射
-	var channelMapping service.ChannelMappingResult
-	if apiKey.GroupID != nil {
-		channelMapping = h.gatewayService.ResolveChannelMapping(c.Request.Context(), *apiKey.GroupID, reqModel)
-	}
-
-	// 渠道模型限制检查：先映射再判断，映射后的模型在定价列表中即放行
-	if apiKey.GroupID != nil {
-		if h.gatewayService.IsModelRestricted(c.Request.Context(), *apiKey.GroupID, channelMapping.MappedModel) {
+	// 解析渠道级模型映射 + 限制检查
+	channelMapping, restricted := h.gatewayService.ResolveChannelMappingAndRestrict(c.Request.Context(), apiKey.GroupID, reqModel)
+	if restricted {
 		h.errorResponse(c, http.StatusServiceUnavailable, "api_error", "No available accounts")
 		return
 	}
-	}
 
 	// 设置 max_tokens=1 + haiku 探测请求标识到 context 中
 	// 必须在 SetClaudeCodeClientContext 之前设置，因为 ClaudeCodeValidator 需要读取此标识进行绕过判断
@@ -495,18 +488,7 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 					ChannelID:          channelMapping.ChannelID,
 					OriginalModel:      reqModel,
 					BillingModelSource: channelMapping.BillingModelSource,
-					ModelMappingChain: func() string {
-						if !channelMapping.Mapped {
-							if result.UpstreamModel != "" && result.UpstreamModel != result.Model {
-								return reqModel + "→" + result.UpstreamModel
-							}
-							return ""
-						}
-						if result.UpstreamModel != "" && result.UpstreamModel != channelMapping.MappedModel {
-							return reqModel + "→" + channelMapping.MappedModel + "→" + result.UpstreamModel
-						}
-						return reqModel + "→" + channelMapping.MappedModel
-					}(),
+					ModelMappingChain:  channelMapping.BuildModelMappingChain(reqModel, result.UpstreamModel),
 				}); err != nil {
 					logger.L().With(
 						zap.String("component", "handler.gateway.messages"),
@@ -849,18 +831,7 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 					ChannelID:          channelMapping.ChannelID,
 					OriginalModel:      reqModel,
 					BillingModelSource: channelMapping.BillingModelSource,
-					ModelMappingChain: func() string {
-						if !channelMapping.Mapped {
-							if result.UpstreamModel != "" && result.UpstreamModel != result.Model {
-								return reqModel + "→" + result.UpstreamModel
-							}
-							return ""
-						}
-						if result.UpstreamModel != "" && result.UpstreamModel != channelMapping.MappedModel {
-							return reqModel + "→" + channelMapping.MappedModel + "→" + result.UpstreamModel
-						}
-						return reqModel + "→" + channelMapping.MappedModel
-					}(),
+					ModelMappingChain:  channelMapping.BuildModelMappingChain(reqModel, result.UpstreamModel),
 				}); err != nil {
 					logger.L().With(
 						zap.String("component", "handler.gateway.messages"),

backend/internal/handler/openai_gateway_handler.go

@@ -185,18 +185,12 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 	setOpsRequestContext(c, reqModel, reqStream, body)
 	setOpsEndpointContext(c, "", int16(service.RequestTypeFromLegacy(reqStream, false)))
 
-	// 解析渠道级模型映射
-	var channelMapping service.ChannelMappingResult
-	if apiKey.GroupID != nil {
-		channelMapping = h.gatewayService.ResolveChannelMapping(c.Request.Context(), *apiKey.GroupID, reqModel)
-	}
-
-	// 渠道模型限制检查：先映射再判断
-	if apiKey.GroupID != nil {
-		if h.gatewayService.IsModelRestricted(c.Request.Context(), *apiKey.GroupID, channelMapping.MappedModel) {
+	// 解析渠道级模型映射 + 限制检查
+	channelMapping, restricted := h.gatewayService.ResolveChannelMappingAndRestrict(c.Request.Context(), apiKey.GroupID, reqModel)
+	if restricted {
+		h.errorResponse(c, http.StatusServiceUnavailable, "api_error", "No available accounts")
 		return
 	}
-	}
 
 	// 提前校验 function_call_output 是否具备可关联上下文，避免上游 400。
 	if !h.validateFunctionCallOutputRequest(c, body, reqLog) {
@@ -297,7 +291,12 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 		// Forward request
 		service.SetOpsLatencyMs(c, service.OpsRoutingLatencyMsKey, time.Since(routingStart).Milliseconds())
 		forwardStart := time.Now()
-		result, err := h.gatewayService.Forward(c.Request.Context(), c, account, body)
+		// 应用渠道模型映射到请求体
+		forwardBody := body
+		if channelMapping.Mapped {
+			forwardBody = h.gatewayService.ReplaceModelInBody(body, channelMapping.MappedModel)
+		}
+		result, err := h.gatewayService.Forward(c.Request.Context(), c, account, forwardBody)
 		forwardDurationMs := time.Since(forwardStart).Milliseconds()
 		if accountReleaseFunc != nil {
 			accountReleaseFunc()
@@ -395,18 +394,7 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 				ChannelID:          channelMapping.ChannelID,
 				OriginalModel:      reqModel,
 				BillingModelSource: channelMapping.BillingModelSource,
-				ModelMappingChain: func() string {
-					if !channelMapping.Mapped {
-						if result.UpstreamModel != "" && result.UpstreamModel != result.Model {
-							return reqModel + "→" + result.UpstreamModel
-						}
-						return ""
-					}
-					if result.UpstreamModel != "" && result.UpstreamModel != channelMapping.MappedModel {
-						return reqModel + "→" + channelMapping.MappedModel + "→" + result.UpstreamModel
-					}
-					return reqModel + "→" + channelMapping.MappedModel
-				}(),
+				ModelMappingChain:  channelMapping.BuildModelMappingChain(reqModel, result.UpstreamModel),
 			}); err != nil {
 				logger.L().With(
 					zap.String("component", "handler.openai_gateway.responses"),
@@ -577,18 +565,12 @@ func (h *OpenAIGatewayHandler) Messages(c *gin.Context) {
 	setOpsRequestContext(c, reqModel, reqStream, body)
 	setOpsEndpointContext(c, "", int16(service.RequestTypeFromLegacy(reqStream, false)))
 
-	// 解析渠道级模型映射
-	var channelMappingMsg service.ChannelMappingResult
-	if apiKey.GroupID != nil {
-		channelMappingMsg = h.gatewayService.ResolveChannelMapping(c.Request.Context(), *apiKey.GroupID, reqModel)
-	}
-
-	// 渠道模型限制检查：先映射再判断
-	if apiKey.GroupID != nil {
-		if h.gatewayService.IsModelRestricted(c.Request.Context(), *apiKey.GroupID, channelMappingMsg.MappedModel) {
+	// 解析渠道级模型映射 + 限制检查
+	channelMappingMsg, restricted := h.gatewayService.ResolveChannelMappingAndRestrict(c.Request.Context(), apiKey.GroupID, reqModel)
+	if restricted {
+		h.anthropicErrorResponse(c, http.StatusServiceUnavailable, "api_error", "No available accounts")
 		return
 	}
-	}
 
 	// 绑定错误透传服务，允许 service 层在非 failover 错误场景复用规则。
 	if h.errorPassthroughService != nil {
@@ -714,7 +696,12 @@ func (h *OpenAIGatewayHandler) Messages(c *gin.Context) {
 		// Forward 层需要始终拿到 group 默认映射模型，这样未命中账号级映射的
 		// Claude 兼容模型才不会在后续 Codex 规范化中意外退化到 gpt-5.1。
 		defaultMappedModel := resolveOpenAIForwardDefaultMappedModel(apiKey, c.GetString("openai_messages_fallback_model"))
-		result, err := h.gatewayService.ForwardAsAnthropic(c.Request.Context(), c, account, body, promptCacheKey, defaultMappedModel)
+		// 应用渠道模型映射到请求体
+		forwardBody := body
+		if channelMappingMsg.Mapped {
+			forwardBody = h.gatewayService.ReplaceModelInBody(body, channelMappingMsg.MappedModel)
+		}
+		result, err := h.gatewayService.ForwardAsAnthropic(c.Request.Context(), c, account, forwardBody, promptCacheKey, defaultMappedModel)
 
 		forwardDurationMs := time.Since(forwardStart).Milliseconds()
 		if accountReleaseFunc != nil {
@@ -803,18 +790,7 @@ func (h *OpenAIGatewayHandler) Messages(c *gin.Context) {
 				ChannelID:          channelMappingMsg.ChannelID,
 				OriginalModel:      reqModel,
 				BillingModelSource: channelMappingMsg.BillingModelSource,
-				ModelMappingChain: func() string {
-					if !channelMappingMsg.Mapped {
-						if result.UpstreamModel != "" && result.UpstreamModel != result.Model {
-							return reqModel + "→" + result.UpstreamModel
-						}
-						return ""
-					}
-					if result.UpstreamModel != "" && result.UpstreamModel != channelMappingMsg.MappedModel {
-						return reqModel + "→" + channelMappingMsg.MappedModel + "→" + result.UpstreamModel
-					}
-					return reqModel + "→" + channelMappingMsg.MappedModel
-				}(),
+				ModelMappingChain:  channelMappingMsg.BuildModelMappingChain(reqModel, result.UpstreamModel),
 			}); err != nil {
 				logger.L().With(
 					zap.String("component", "handler.openai_gateway.messages"),
@@ -1157,19 +1133,12 @@ func (h *OpenAIGatewayHandler) ResponsesWebSocket(c *gin.Context) {
 	setOpsRequestContext(c, reqModel, true, firstMessage)
 	setOpsEndpointContext(c, "", int16(service.RequestTypeWSV2))
 
-	// 解析渠道级模型映射
-	var channelMappingWS service.ChannelMappingResult
-	if apiKey.GroupID != nil {
-		channelMappingWS = h.gatewayService.ResolveChannelMapping(ctx, *apiKey.GroupID, reqModel)
-	}
-
-	// 渠道模型限制检查：先映射再判断
-	if apiKey.GroupID != nil {
-		if h.gatewayService.IsModelRestricted(ctx, *apiKey.GroupID, channelMappingWS.MappedModel) {
+	// 解析渠道级模型映射 + 限制检查
+	channelMappingWS, restricted := h.gatewayService.ResolveChannelMappingAndRestrict(ctx, apiKey.GroupID, reqModel)
+	if restricted {
 		closeOpenAIClientWS(wsConn, coderws.StatusPolicyViolation, "model not allowed")
 		return
 	}
-	}
 
 	var currentUserRelease func()
 	var currentAccountRelease func()
@@ -1332,18 +1301,7 @@ func (h *OpenAIGatewayHandler) ResponsesWebSocket(c *gin.Context) {
 					ChannelID:          channelMappingWS.ChannelID,
 					OriginalModel:      reqModel,
 					BillingModelSource: channelMappingWS.BillingModelSource,
-					ModelMappingChain: func() string {
-						if !channelMappingWS.Mapped {
-							if result.UpstreamModel != "" && result.UpstreamModel != result.Model {
-								return reqModel + "→" + result.UpstreamModel
-							}
-							return ""
-						}
-						if result.UpstreamModel != "" && result.UpstreamModel != channelMappingWS.MappedModel {
-							return reqModel + "→" + channelMappingWS.MappedModel + "→" + result.UpstreamModel
-						}
-						return reqModel + "→" + channelMappingWS.MappedModel
-					}(),
+					ModelMappingChain:  channelMappingWS.BuildModelMappingChain(reqModel, result.UpstreamModel),
 				}); err != nil {
 					reqLog.Error("openai.websocket_record_usage_failed",
 						zap.Int64("account_id", account.ID),
@@ -1355,7 +1313,13 @@ func (h *OpenAIGatewayHandler) ResponsesWebSocket(c *gin.Context) {
 		},
 	}
 
-	if err := h.gatewayService.ProxyResponsesWebSocketFromClient(ctx, c, wsConn, account, token, firstMessage, hooks); err != nil {
+	// 应用渠道模型映射到 WebSocket 首条消息
+	wsFirstMessage := firstMessage
+	if channelMappingWS.Mapped {
+		wsFirstMessage = h.gatewayService.ReplaceModelInBody(firstMessage, channelMappingWS.MappedModel)
+	}
+
+	if err := h.gatewayService.ProxyResponsesWebSocketFromClient(ctx, c, wsConn, account, token, wsFirstMessage, hooks); err != nil {
 		h.gatewayService.ReportOpenAIAccountScheduleResult(account.ID, false, nil)
 		closeStatus, closeReason := summarizeWSCloseErrorForLog(err)
 		reqLog.Warn("openai.websocket_proxy_failed",

backend/internal/service/channel_service.go

@@ -92,6 +92,23 @@ type ChannelMappingResult struct {
 	BillingModelSource string // 计费模型来源（"requested" / "upstream"）
 }
 
+// BuildModelMappingChain 根据映射结果和上游实际模型构建映射链描述。
+// reqModel: 客户端请求的原始模型名。
+// upstreamModel: 上游实际使用的模型名（ForwardResult.UpstreamModel）。
+// 返回空字符串表示无映射。
+func (r ChannelMappingResult) BuildModelMappingChain(reqModel, upstreamModel string) string {
+	if !r.Mapped {
+		if upstreamModel != "" && upstreamModel != reqModel {
+			return reqModel + "→" + upstreamModel
+		}
+		return ""
+	}
+	if upstreamModel != "" && upstreamModel != r.MappedModel {
+		return reqModel + "→" + r.MappedModel + "→" + upstreamModel
+	}
+	return reqModel + "→" + r.MappedModel
+}
+
 const (
 	channelCacheTTL    = 60 * time.Second
 	channelErrorTTL    = 5 * time.Second // DB 错误时的短缓存

backend/internal/service/gateway_service.go

@@ -8195,6 +8195,19 @@ func (s *GatewayService) IsModelRestricted(ctx context.Context, groupID int64, m
 	return s.channelService.IsModelRestricted(ctx, groupID, model)
 }
 
+// ResolveChannelMappingAndRestrict 解析渠道映射并检查模型限制。
+// 返回映射结果和是否被限制。
+func (s *GatewayService) ResolveChannelMappingAndRestrict(ctx context.Context, groupID *int64, model string) (ChannelMappingResult, bool) {
+	var mapping ChannelMappingResult
+	mapping.MappedModel = model
+	if groupID == nil {
+		return mapping, false
+	}
+	mapping = s.ResolveChannelMapping(ctx, *groupID, model)
+	restricted := s.IsModelRestricted(ctx, *groupID, mapping.MappedModel)
+	return mapping, restricted
+}
+
 // ForwardCountTokens 转发 count_tokens 请求到上游 API
 // 特点：不记录使用量、仅支持非流式响应
 func (s *GatewayService) ForwardCountTokens(ctx context.Context, c *gin.Context, account *Account, parsed *ParsedRequest) error {

backend/internal/service/openai_gateway_service.go

@@ -413,6 +413,34 @@ func (s *OpenAIGatewayService) IsModelRestricted(ctx context.Context, groupID in
 	return s.channelService.IsModelRestricted(ctx, groupID, model)
 }
 
+// ResolveChannelMappingAndRestrict 解析渠道映射并检查模型限制。
+// 返回映射结果和是否被限制。
+func (s *OpenAIGatewayService) ResolveChannelMappingAndRestrict(ctx context.Context, groupID *int64, model string) (ChannelMappingResult, bool) {
+	var mapping ChannelMappingResult
+	mapping.MappedModel = model
+	if groupID == nil {
+		return mapping, false
+	}
+	mapping = s.ResolveChannelMapping(ctx, *groupID, model)
+	restricted := s.IsModelRestricted(ctx, *groupID, mapping.MappedModel)
+	return mapping, restricted
+}
+
+// ReplaceModelInBody 替换请求体中的 JSON model 字段（通用 gjson/sjson 实现）。
+func (s *OpenAIGatewayService) ReplaceModelInBody(body []byte, newModel string) []byte {
+	if len(body) == 0 {
+		return body
+	}
+	if current := gjson.GetBytes(body, "model"); current.Exists() && current.String() == newModel {
+		return body
+	}
+	newBody, err := sjson.SetBytes(body, "model", newModel)
+	if err != nil {
+		return body
+	}
+	return newBody
+}
+
 func (s *OpenAIGatewayService) getCodexSnapshotThrottle() *accountWriteThrottle {
 	if s != nil && s.codexSnapshotThrottle != nil {
 		return s.codexSnapshotThrottle

frontend/src/views/admin/ChannelsView.vue

@@ -683,7 +683,6 @@ function formToAPI(): { group_ids: number[], model_pricing: ChannelModelPricing[
 
     // Model pricing with platform tag
     for (const entry of section.model_pricing) {
-      console.log('[formToAPI] entry:', JSON.stringify({ models: entry.models, billing_mode: entry.billing_mode, per_request_price: entry.per_request_price }))
       if (entry.models.length === 0) continue
       model_pricing.push({
         platform: section.platform,
@@ -700,7 +699,6 @@ function formToAPI(): { group_ids: number[], model_pricing: ChannelModelPricing[
     }
   }
 
-  console.log('[formToAPI] result:', JSON.stringify({ group_ids, model_pricing_count: model_pricing.length, model_mapping_keys: Object.keys(model_mapping), platforms_count: form.platforms.length, pricing_entries: form.platforms.map(s => s.model_pricing.length) }))
   return { group_ids, model_pricing, model_mapping }
 }
 
@@ -883,7 +881,6 @@ async function handleSubmit() {
   }
 
   const { group_ids, model_pricing, model_mapping } = formToAPI()
-  console.log('[handleSubmit] model_pricing to send:', JSON.stringify(model_pricing))
 
   submitting.value = true
   try {