Add Unlink API.

controllers/auth.go

@@ -195,7 +195,8 @@ func (c *ApiController) Login() {
 				return
 			}
 
-			isLinked := object.LinkUserAccount(userId, provider.Type, userInfo.Username)
+			user := object.GetUser(userId)
+			isLinked := object.LinkUserAccount(user, provider.Type, userInfo.Username)
 			if isLinked {
 				resp = &Response{Status: "ok", Msg: "", Data: isLinked}
 			} else {

controllers/link.go

@@ -0,0 +1,59 @@
+// Copyright 2021 The casbin 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.
+
+package controllers
+
+import (
+	"encoding/json"
+
+	"github.com/casdoor/casdoor/object"
+)
+
+type LinkForm struct {
+	ProviderType string `json:"providerType"`
+}
+
+func (c *ApiController) Unlink() {
+	var resp Response
+
+	if c.GetSessionUser() == "" {
+		resp = Response{Status: "error", Msg: "Please sign in first", Data: c.GetSessionUser()}
+		c.Data["json"] = resp
+		c.ServeJSON()
+		return
+	}
+
+	var form LinkForm
+	err := json.Unmarshal(c.Ctx.Input.RequestBody, &form)
+	if err != nil {
+		panic(err)
+	}
+	providerType := form.ProviderType
+
+	userId := c.GetSessionUser()
+	user := object.GetUser(userId)
+	value := object.GetUserField(user, providerType)
+
+	if value == "" {
+		resp = Response{Status: "error", Msg: "Please link first", Data: value}
+		c.Data["json"] = resp
+		c.ServeJSON()
+		return
+	}
+
+	object.LinkUserAccount(user, providerType, "")
+	resp = Response{Status: "ok", Msg: ""}
+	c.Data["json"] = resp
+	c.ServeJSON()
+}