Add oauth relation with token

lib/rails_api_authentication/authable.rb

@@ -73,10 +73,25 @@ module RailsApiAuthentication
       end
 
       def oauth_login(oauth_type, oauth_id)
+        if @oauth_only.present?
           user = self.find_or_create_by oauth_type: oauth_type, oauth_id: oauth_id
           AuthToken.create(
             self, {oid: user.id, oauth_type: oauth_type, oauth_id: oauth_id }
           )
+        else
+          auth = AuthToken.find(oauth_type: oauth_type, oauth_id: oauth_id)&.first
+          user = self.find_by(id: auth.oid)
+          raise(UserError.new(401, '-1', 'Unauthorized')) unless user.present?
+        end
+      end
+
+      def oauth_relate(token, oauth_type, oauth_id)
+        auth = AuthToken.find(token: token)&.first
+        if auth.present? && self.find_by(id: auth.oid).present?
+          auth.update(oauth_type: oauth_type, oauth_id: oauth_id)
+        else
+          raise(UserError.new(401, '-1', 'Unauthorized')) unless user.present?
+        end
       end
 
       def auth!(request)

lib/rails_api_authentication/oauth_session.rb

@@ -12,11 +12,28 @@ module RailsApiAuthentication
       render json: { error: e.message }, status: e.status
     end
 
+    def update
+      @auth_token = self.class.klass.oauth_relate(
+        session_relate_params.delete(:token),
+        session_relate_params.delete(:oauth_type),
+        session_relate_params.delete(:oauth_id),
+      )
+      render json: { token: @auth_token.token }, status: 200
+    rescue UserError => e
+      render json: { error: e.message }, status: e.status
+    end
+
     def destroy
       self.send("current_#{self.class.klass_sym}")&.logout
       render json: { message: "logout successful" }, status: 200
     end
 
+    def session_relate_params
+      params.require(self.class.klass_sym).permit(
+        :oauth_type, :oauth_id, :token
+      )
+    end
+
     def session_params
       params.require(self.class.klass_sym).permit(:oauth_type, :oauth_id)
     end