增加wechat账号可用性检测，为直接使用微信账号注册服务，在注册前检测微信账号的可用性，是否被占用

.gitignore

@@ -4,4 +4,5 @@ upload
 *.exe
 *.db
 build
-*.db-journal
+*.db-journal
+one-api

controller/wechat.go

@@ -172,3 +172,21 @@ func WeChatBind(c *gin.Context) {
 	})
 	return
 }
+
+func IsWeChatIdAvailable(c *gin.Context) {
+
+	wechatId := c.Query("wechat_id")
+
+	if model.IsWeChatIdAlreadyTaken(wechatId) {
+		c.JSON(http.StatusOK, gin.H{
+			"success": false,
+			"message": "该微信账号已被绑定，不可用",
+		})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{
+		"success": true,
+		"message": "该微信账号未绑定任何账号，可用",
+	})
+	return
+}

router/api-router.go

@@ -23,6 +23,7 @@ func SetApiRouter(router *gin.Engine) {
 		apiRouter.GET("/oauth/github", middleware.CriticalRateLimit(), controller.GitHubOAuth)
 		apiRouter.GET("/oauth/state", middleware.CriticalRateLimit(), controller.GenerateOAuthCode)
 		apiRouter.GET("/oauth/wechat", middleware.CriticalRateLimit(), controller.WeChatAuth)
+		apiRouter.GET("/oauth/wechat/is_available", middleware.CriticalRateLimit(), controller.IsWeChatIdAvailable)
 		apiRouter.GET("/oauth/wechat/bind", middleware.CriticalRateLimit(), middleware.UserAuth(), controller.WeChatBind)
 		apiRouter.GET("/oauth/email/bind", middleware.CriticalRateLimit(), middleware.UserAuth(), controller.EmailBind)