feat: 算力引擎 Go 后端核心（new-api）

- 统一 OpenAI 兼容 /v1 中继 + 渠道/额度/令牌/流水 - 各领域包：relay 模型网关、model 数据层、controller 管理 API
2026-08-23 22:38:46 +08:00
commit 28e53d90fc
836 changed files with 165403 additions and 0 deletions
@@ -0,0 +1,63 @@
+package helper
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/QuantumNous/new-api/relay/common"
+	"github.com/QuantumNous/new-api/relaykit/dto"
+	"github.com/gin-gonic/gin"
+)
+
+func ModelMappedHelper(c *gin.Context, info *common.RelayInfo, request dto.Request) error {
+	if info.ChannelMeta == nil {
+		info.ChannelMeta = &common.ChannelMeta{}
+	}
+
+	// map model name
+	modelMapping := c.GetString("model_mapping")
+	if modelMapping != "" && modelMapping != "{}" {
+		modelMap := make(map[string]string)
+		err := json.Unmarshal([]byte(modelMapping), &modelMap)
+		if err != nil {
+			return fmt.Errorf("unmarshal_model_mapping_failed")
+		}
+
+		// 支持链式模型重定向，最终使用链尾的模型
+		currentModel := info.OriginModelName
+		visitedModels := map[string]bool{
+			currentModel: true,
+		}
+		for {
+			if mappedModel, exists := modelMap[currentModel]; exists && mappedModel != "" {
+				// 模型重定向循环检测，避免无限循环
+				if visitedModels[mappedModel] {
+					if mappedModel == currentModel {
+						if currentModel == info.OriginModelName {
+							info.IsModelMapped = false
+							return nil
+						} else {
+							info.IsModelMapped = true
+							break
+						}
+					}
+					return errors.New("model_mapping_contains_cycle")
+				}
+				visitedModels[mappedModel] = true
+				currentModel = mappedModel
+				info.IsModelMapped = true
+			} else {
+				break
+			}
+		}
+		if info.IsModelMapped {
+			info.UpstreamModelName = currentModel
+		}
+	}
+
+	if request != nil {
+		request.SetModelName(info.UpstreamModelName)
+	}
+	return nil
+}