feat: 优化Gemini模型版本获取逻辑

constant/env.go

@@ -1,7 +1,10 @@
 package constant
 
 import (
+	"fmt"
 	"one-api/common"
+	"os"
+	"strings"
 )
 
 var StreamingTimeout = common.GetEnvOrDefault("STREAMING_TIMEOUT", 30)
@@ -15,3 +18,29 @@ var GetMediaToken = common.GetEnvOrDefaultBool("GET_MEDIA_TOKEN", true)
 var GetMediaTokenNotStream = common.GetEnvOrDefaultBool("GET_MEDIA_TOKEN_NOT_STREAM", true)
 
 var UpdateTask = common.GetEnvOrDefaultBool("UPDATE_TASK", true)
+
+var GeminiModelMap = map[string]string{
+	"gemini-1.5-pro-latest":   "v1beta",
+	"gemini-1.5-pro-001":      "v1beta",
+	"gemini-1.5-pro":          "v1beta",
+	"gemini-1.5-pro-exp-0801": "v1beta",
+	"gemini-1.5-flash-latest": "v1beta",
+	"gemini-1.5-flash-001":    "v1beta",
+	"gemini-1.5-flash":        "v1beta",
+	"gemini-ultra":            "v1beta",
+}
+
+func InitEnv() {
+	modelVersionMapStr := strings.TrimSpace(os.Getenv("GEMINI_MODEL_MAP"))
+	if modelVersionMapStr == "" {
+		return
+	}
+	for _, pair := range strings.Split(modelVersionMapStr, ",") {
+		parts := strings.Split(pair, ":")
+		if len(parts) == 2 {
+			GeminiModelMap[parts[0]] = parts[1]
+		} else {
+			common.SysError(fmt.Sprintf("invalid model version map: %s", pair))
+		}
+	}
+}