Add exchange api endpoint, fix jwt authtoken var type error

Signed-off-by: Asai Neko <sugar@sne.moe>

service/auth/handler.go

@@ -7,8 +7,9 @@ import (
 )
 
 func Handler(r *gin.RouterGroup) {
-	r.GET("/redirect", middleware.JWTAuth(false), Redirect)
+	r.GET("/redirect", Redirect)
 	r.POST("/magic", middleware.ApiVersionCheck(), Magic)
 	r.POST("/token", middleware.ApiVersionCheck(), Token)
 	r.POST("/refresh", middleware.ApiVersionCheck(), Refresh)
+	r.POST("/exchange", middleware.ApiVersionCheck(), middleware.JWTAuth(), Exchange)
 }