Added Revoke access function for revoking token

README.MD

@@ -118,9 +118,41 @@ export class SigninComponent implements OnInit {
 
 }
 ```
+In `the profile component,the page After login you give your user the access profile.component.ts`,
+```javascript
+public unlinkaccount(socialPlatform : string) {
+    let socialPlatformProvider;
+    if(socialPlatform === "facebook"){
+      socialPlatformProvider = FacebookLoginProvider.PROVIDER_ID;
+      socialPlatformProvider = GoogleLoginProvider.PROVIDER_ID;
+      this.socialAuthService.revokeAccess(this.userid).then(
+        (revokeres) => {
+                console.log(revokeres);
+                //the url to redirect after revocation
+                this.router.navigate(['/login',{unlinkmessage:'You have successfully unlinked your account'}]);
+        }
+        );
+    }else if(socialPlatform === "google"){
+      socialPlatformProvider = GoogleLoginProvider.PROVIDER_ID;
+      this.socialAuthService.revokeAccess(this.userid).then(
+        (revokeres) => {
+                console.log(revokeres);
+                //the url to redirect after revocation
+                this.router.navigate(['/login',{unlinkmessage:revokeres}]);
+        }
+        );
+    }
+  }
+```
+In `profile.component.html`
+```html
+<h1>
+Unlink {{provider}} Account
+</h1>
 
-
-
+ <button (click)="unlinkaccount(provider)" *ngIf="provider" color="warn">Unlink {{provider}} account</button>
+
+```
 In `signin.component.html`,
 
 ```html

src/auth.service.ts

@@ -82,5 +82,23 @@ export class AuthService {
       }
     });
   }
-
+  revokeAccess(userid:string): Promise<any> {
+    var _this = this;
+        return new Promise(function (resolve, reject) {
+            if (_this._user && _this._user.provider) {
+                let /** @type {?} */ providerId = _this._user.provider;
+                let /** @type {?} */ providerObject = _this.providers.get(providerId);
+                providerObject.revokeAccess(userid).then(function (revokeres) {
+                    _this._user = null;
+                    _this._authState.next(null);
+                    resolve(revokeres);
+                }).catch(function (err) {
+                    _this._authState.next(null);
+                });
+            }
+            else {
+                reject(AuthService.LOGIN_PROVIDER_NOT_FOUND);
+            }
+        });
+  }
 }

src/entities/base-login-provider.ts

@@ -7,7 +7,7 @@ export abstract class BaseLoginProvider implements LoginProvider {
   abstract initialize(): Promise<SocialUser>;
   abstract signIn(): Promise<SocialUser>;
   abstract signOut(): Promise<any>;
-
+  abstract revokeAccess(userid:string):Promise<any>;
   loadScript(obj: LoginProviderClass, onload: any): void {
     if (document.getElementById(obj.name)) { return; }
     let signInJS = document.createElement('script');

src/entities/login-provider.ts

@@ -4,5 +4,6 @@ export interface LoginProvider {
   initialize(): Promise<SocialUser>;
   signIn(): Promise<SocialUser>;
   signOut(): Promise<any>;
+  revokeAccess(userid:string):Promise<any>;
 }
 

src/providers/facebook-login-provider.ts

@@ -69,5 +69,11 @@ export class FacebookLoginProvider extends BaseLoginProvider {
       });
     });
   }
-
+  revokeAccess(userid:string): Promise<any>{
+    return new Promise(function (resolve, reject) {
+      FB.api(`/${userid}/permissions`,'DELETE',{},function (response) {
+          resolve('Account Unlink success');
+      });
+  });
+  }
 }

src/providers/google-login-provider.ts

@@ -68,5 +68,18 @@ export class GoogleLoginProvider extends BaseLoginProvider {
       });
     });
   }
+  revokeAccess(userid:string): Promise<any>{
+    var _this = this;
+    return new Promise(function (resolve, reject) {
+      _this.auth2.disconnect().then(function (err) {
+          if (err) {
+              reject(err);
+          }
+          else {
+              resolve('Google account Unlink success');
+          }
+      });
+  });
+  }
 
 }