fix: add FaceIdSigninBegin() to verify user information before face login (#2815)

* feat: add FaceIdSigninBegin() to verify user information before face login

* Update face.go

---------

Co-authored-by: Eric Luo <hsluoyz@qq.com>

controllers/face.go

@@ -0,0 +1,55 @@
+// Copyright 2024 The Casdoor Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Casdoor will expose its providers as services to SDK
+// We are going to implement those services as APIs here
+
+package controllers
+
+import (
+	"fmt"
+
+	"github.com/casdoor/casdoor/object"
+	"github.com/casdoor/casdoor/util"
+)
+
+// FaceIDSigninBegin
+// @Title FaceIDSigninBegin
+// @Tag Login API
+// @Description FaceId Login Flow 1st stage
+// @Param   owner     query    string  true        "owner"
+// @Param   name     query    string  true        "name"
+// @Success 200 {object} controllers.Response The Response object
+// @router /faceid-signin-begin [get]
+func (c *ApiController) FaceIDSigninBegin() {
+	userOwner := c.Input().Get("owner")
+	userName := c.Input().Get("name")
+
+	user, err := object.GetUserByFields(userOwner, userName)
+	if err != nil {
+		c.ResponseError(err.Error())
+		return
+	}
+	if user == nil {
+		c.ResponseError(fmt.Sprintf(c.T("general:The user: %s doesn't exist"), util.GetId(userOwner, userName)))
+		return
+	}
+
+	if len(user.FaceIds) == 0 {
+		c.ResponseError(c.T("check:Face data does not exist, cannot log in"))
+		return
+	}
+
+	c.ResponseOk()
+}