feat: update user access (#151)

* feat: update user access

* revoked timestamp field updated

* updates

* updates

* updates

server/handlers/oauth_callback.go

@@ -95,9 +95,12 @@ func OAuthCallbackHandler() gin.HandlerFunc {
 			user.EmailVerifiedAt = &now
 			user, _ = db.Provider.AddUser(user)
 		} else {
+			if user.RevokedTimestamp != nil {
+				c.JSON(400, gin.H{"error": "user access has been revoked"})
+			}
+
 			// user exists in db, check if method was google
 			// if not append google to existing signup method and save it
-
 			signupMethod := existingUser.SignupMethods
 			if !strings.Contains(signupMethod, provider) {
 				signupMethod = signupMethod + "," + provider