feat(advanced-custom): remove fallback option and enhance path matching for advanced custom routes

middleware/distributor.go

@@ -104,7 +104,8 @@ func Distribute() func(c *gin.Context) {
 				if preferredChannelID, found := service.GetPreferredChannelByAffinity(c, modelRequest.Model, usingGroup); found {
 					affinityUsable := false
 					preferred, err := model.CacheGetChannel(preferredChannelID)
-					if err == nil && preferred != nil && preferred.Status == common.ChannelStatusEnabled {
+					if err == nil && preferred != nil && preferred.Status == common.ChannelStatusEnabled &&
+						channelSupportsRequestPath(preferred, c.Request.URL.Path) {
 						if usingGroup == "auto" {
 							userGroup := common.GetContextKeyString(c, constant.ContextKeyUserGroup)
 							autoGroups := service.GetUserAutoGroup(userGroup)
@@ -132,10 +133,11 @@ func Distribute() func(c *gin.Context) {
 
 				if channel == nil {
 					channel, selectGroup, err = service.CacheGetRandomSatisfiedChannel(&service.RetryParam{
-						Ctx:        c,
-						ModelName:  modelRequest.Model,
-						TokenGroup: usingGroup,
-						Retry:      common.GetPointer(0),
+						Ctx:         c,
+						ModelName:   modelRequest.Model,
+						TokenGroup:  usingGroup,
+						RequestPath: c.Request.URL.Path,
+						Retry:       common.GetPointer(0),
 					})
 					if err != nil {
 						showGroup := usingGroup
@@ -167,6 +169,20 @@ func Distribute() func(c *gin.Context) {
 	}
 }
 
+// channelSupportsRequestPath reports whether a channel can serve the request path.
+// Only Advanced Custom (type 58) channels are path-checked; all other channel types
+// always pass. A type-58 channel is usable only when one of its routes matches.
+func channelSupportsRequestPath(channel *model.Channel, requestPath string) bool {
+	if channel == nil {
+		return false
+	}
+	if channel.Type != constant.ChannelTypeAdvancedCustom {
+		return true
+	}
+	config := channel.GetOtherSettings().AdvancedCustom
+	return config != nil && config.SupportsPath(requestPath)
+}
+
 // getModelFromRequest 从请求中读取模型信息
 // 根据 Content-Type 自动处理：
 // - application/json