refactor: refactor relay part (#957)

* refactor: refactor relay part

* refactor: refactor config part

relay/util/relay_meta.go

@@ -0,0 +1,44 @@
+package util
+
+import (
+	"github.com/gin-gonic/gin"
+	"one-api/common"
+	"strings"
+)
+
+type RelayMeta struct {
+	ChannelType  int
+	ChannelId    int
+	TokenId      int
+	TokenName    string
+	UserId       int
+	Group        string
+	ModelMapping map[string]string
+	BaseURL      string
+	APIVersion   string
+	APIKey       string
+	Config       map[string]string
+}
+
+func GetRelayMeta(c *gin.Context) *RelayMeta {
+	meta := RelayMeta{
+		ChannelType:  c.GetInt("channel"),
+		ChannelId:    c.GetInt("channel_id"),
+		TokenId:      c.GetInt("token_id"),
+		TokenName:    c.GetString("token_name"),
+		UserId:       c.GetInt("id"),
+		Group:        c.GetString("group"),
+		ModelMapping: c.GetStringMapString("model_mapping"),
+		BaseURL:      c.GetString("base_url"),
+		APIVersion:   c.GetString("api_version"),
+		APIKey:       strings.TrimPrefix(c.Request.Header.Get("Authorization"), "Bearer "),
+		Config:       nil,
+	}
+	if meta.ChannelType == common.ChannelTypeAzure {
+		meta.APIVersion = GetAzureAPIVersion(c)
+	}
+	if meta.BaseURL == "" {
+		meta.BaseURL = common.ChannelBaseURLs[meta.ChannelType]
+	}
+	return &meta
+}