diff --git a/FrontEnd/src/app/app-routing.module.ts b/FrontEnd/src/app/app-routing.module.ts
index fcbe078..b9a7e19 100644
--- a/FrontEnd/src/app/app-routing.module.ts
+++ b/FrontEnd/src/app/app-routing.module.ts
@@ -45,10 +45,12 @@ import { WaitingResourcesComponent } from './groups/waiting-resources/waiting-re
 import { BagdesComponent } from './user/bagdes/bagdes.component';
 import { RankingComponent } from './groups/ranking/ranking.component';
 import { HistoryOfActivityInGroupComponent } from './groups/history-of-activity-in-group/history-of-activity-in-group.component';
+import { LoginUsosComponent } from './login/login-usos/login-usos.component';
 
 
 const routes: Routes = [
   { path: 'login', component: LoginComponent },
+  { path: 'login/usos', component: LoginUsosComponent },
   { path: '', component: HomePageComponent },
   { path: 'home', component: HomePageComponent },
   { path: 'flashcards', component: FlashcardsComponent },
diff --git a/FrontEnd/src/app/app.module.ts b/FrontEnd/src/app/app.module.ts
index 335c200..6fb7b27 100644
--- a/FrontEnd/src/app/app.module.ts
+++ b/FrontEnd/src/app/app.module.ts
@@ -27,6 +27,7 @@ import { SharedModule } from './shared/shared.module';
 import { RoutingStateService } from './routing-state.service';
 
 import { AutofocusDirective } from './autofocus.directive';
+import { LoginUsosComponent } from './login/login-usos/login-usos.component';
 
 
 @NgModule({
@@ -37,7 +38,8 @@ import { AutofocusDirective } from './autofocus.directive';
     FooterComponent,
     HomePageComponent,
     WorkInProgressComponent,
-    AutofocusDirective
+    AutofocusDirective,
+    LoginUsosComponent
   ],
   imports: [
     BrowserModule,
diff --git a/FrontEnd/src/app/authentication.service.ts b/FrontEnd/src/app/authentication.service.ts
index d363e7a..37215ee 100644
--- a/FrontEnd/src/app/authentication.service.ts
+++ b/FrontEnd/src/app/authentication.service.ts
@@ -6,6 +6,7 @@ import 'rxjs/add/operator/catch';
 import 'rxjs/add/observable/throw';
 import { MatSnackBar } from '@angular/material/snack-bar';
 import { Subject } from 'rxjs/Subject';
+import { USOSUrl, LoginKey } from './login';
 
 @Injectable()
 export class AuthenticationService {
@@ -13,6 +14,7 @@ export class AuthenticationService {
     private headers = new HttpHeaders({ 'Content-Type': 'application/json' });
     private storageSub = new Subject<boolean>();
     public token: string;
+
     constructor(private http: HttpClient, public snackBar: MatSnackBar) {
     }
 
@@ -48,6 +50,27 @@ export class AuthenticationService {
             }).catch((error: any) => Observable.throw(error.json().error || 'Server error'));
     }
 
+    usosLogin(username, token) {
+        if (token) {
+            // store username and jwt token w local storage aby nie wylogowało przy zmianie stron
+            localStorage.setItem('currentUser', JSON.stringify({ username: username, authorization: token }));
+            this.getLoggedInName.emit('logged');
+            this.storageSub.next(true);
+            this.snackBar.open('Zalogowano pomyślnie!', null,
+                { duration: 3000, verticalPosition: 'top', panelClass: ['snackbar-success'] });
+            // return true jeśli ok
+            return true;
+        } else {
+            // return false jeśli nie
+            this.getLoggedInName.emit('notLogged');
+            return false;
+        }
+    }
+
+    getUSOSTokens(): Observable<USOSUrl> {
+        return this.http.get<USOSUrl>(encodeURI('usos/request_token?oauth_callback=http://localhost:4200/login/usos'));
+    }
+
     getToken(): String {
         const currentUser = JSON.parse(localStorage.getItem('currentUser'));
         if (currentUser.authorization == null) {
@@ -57,6 +80,16 @@ export class AuthenticationService {
         }
     }
 
+    getAccessByUSOS(outh_t: string, outh_t_secret: string, outh_ver: string): Observable<LoginKey> {
+        const headers = new HttpHeaders({
+            'oauth_token' : outh_t,
+            'oauth_token_secret': outh_t_secret,
+            'oauth_verifier' : outh_ver
+        });
+
+        return this.http.get<LoginKey>('usos/access_token' , {headers: headers});
+    }
+
     isLoggedIn(): boolean {
         const token: String = this.getToken();
         return token && token.length > 0;
diff --git a/FrontEnd/src/app/login.ts b/FrontEnd/src/app/login.ts
new file mode 100644
index 0000000..51ecd7a
--- /dev/null
+++ b/FrontEnd/src/app/login.ts
@@ -0,0 +1,14 @@
+export class USOSUrl {
+
+    url: string;
+
+    constructor() {}
+}
+
+export class LoginKey {
+
+    key: string;
+    username: string;
+
+    constructor() {}
+}
diff --git a/FrontEnd/src/app/login/login-usos/login-usos.component.css b/FrontEnd/src/app/login/login-usos/login-usos.component.css
new file mode 100644
index 0000000..e69de29
diff --git a/FrontEnd/src/app/login/login-usos/login-usos.component.html b/FrontEnd/src/app/login/login-usos/login-usos.component.html
new file mode 100644
index 0000000..e69de29
diff --git a/FrontEnd/src/app/login/login-usos/login-usos.component.spec.ts b/FrontEnd/src/app/login/login-usos/login-usos.component.spec.ts
new file mode 100644
index 0000000..e80e948
--- /dev/null
+++ b/FrontEnd/src/app/login/login-usos/login-usos.component.spec.ts
@@ -0,0 +1,25 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { LoginUsosComponent } from './login-usos.component';
+
+describe('LoginUsosComponent', () => {
+  let component: LoginUsosComponent;
+  let fixture: ComponentFixture<LoginUsosComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ LoginUsosComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(LoginUsosComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});
diff --git a/FrontEnd/src/app/login/login-usos/login-usos.component.ts b/FrontEnd/src/app/login/login-usos/login-usos.component.ts
new file mode 100644
index 0000000..4e44923
--- /dev/null
+++ b/FrontEnd/src/app/login/login-usos/login-usos.component.ts
@@ -0,0 +1,29 @@
+import { Component, OnInit } from '@angular/core';
+import { AuthenticationService } from '../../authentication.service';
+import { Router, ActivatedRoute } from '@angular/router';
+
+@Component({
+  selector: 'app-login-usos',
+  templateUrl: './login-usos.component.html',
+  styleUrls: ['./login-usos.component.css']
+})
+export class LoginUsosComponent implements OnInit {
+
+  constructor(private authenticationService: AuthenticationService,
+              private router: Router) {}
+
+
+  ngOnInit() {
+    const urlArray: string[] = this.router.url.toString().replace('?', '&').split('&');
+    localStorage.setItem('oauth_verifier', urlArray[2].replace('oauth_verifier=', ''));
+
+    this.authenticationService.getAccessByUSOS(localStorage.getItem('outh_token'),
+      localStorage.getItem('outh_token_secret'), localStorage.getItem('oauth_verifier')).subscribe(
+        message => {
+          this.authenticationService.usosLogin(message.username, message.key);
+          this.router.navigate(['/home']);
+      }
+    );
+  }
+
+}
diff --git a/FrontEnd/src/app/login/login.component.html b/FrontEnd/src/app/login/login.component.html
index 0fe4929..dd2ee7a 100644
--- a/FrontEnd/src/app/login/login.component.html
+++ b/FrontEnd/src/app/login/login.component.html
@@ -1,5 +1,7 @@
 <div class="content">
     <div id="container-login">
+        <button class="btn btn-study-cave" (click)="loginWithUsos()">Zaloguj przez USOS</button>
+        <br /><br /><br /><br />
         <div>
             <form (ngSubmit)="login()">
                 Nazwa użytkownika:<br />
diff --git a/FrontEnd/src/app/login/login.component.ts b/FrontEnd/src/app/login/login.component.ts
index 7680b14..a13d8ee 100644
--- a/FrontEnd/src/app/login/login.component.ts
+++ b/FrontEnd/src/app/login/login.component.ts
@@ -16,6 +16,8 @@ export class LoginComponent implements OnInit {
     model: any = {};
     loading = false;
     error = '';
+    private outh_token = '';
+    private outh_token_secret = '';
 
     constructor(
         private router: Router,
@@ -27,8 +29,8 @@ export class LoginComponent implements OnInit {
 
     login() {
         this.loading = true;
-        this.authenticationService.login(this.model.username, this.model.password)
-            .subscribe(result => {
+        this.authenticationService.login(this.model.username, this.model.password).subscribe(
+            result => {
                 if (result === true) {
                     // login successful
                     this.isLogin = true;
@@ -47,6 +49,22 @@ export class LoginComponent implements OnInit {
                 this.error = error;
                 this.snackBar.open('Niepoprawne hasło lub login.', null,
                     { duration: 3000, verticalPosition: 'top', panelClass: ['snackbar-error'] });
-            });
+            }
+        );
+    }
+
+    loginWithUsos() {
+        let array = [] as string[];
+        this.authenticationService.getUSOSTokens().subscribe(el => {
+            array = el.url.split('?');
+            array = array[1].split('&');
+            this.outh_token = array[0];
+            this.outh_token = this.outh_token.replace('oauth_token=', '');
+            this.outh_token_secret = array[1];
+            this.outh_token_secret = this.outh_token_secret.replace('oauth_token_secret=', '');
+            localStorage.setItem('outh_token', array[0].replace('oauth_token=', ''));
+            localStorage.setItem('outh_token_secret', array[1].replace('oauth_token_secret=', ''));
+            window.location.href = el.url;
+        });
     }
 }
diff --git a/FrontEnd/src/app/main-navigation/main-navigation.component.html b/FrontEnd/src/app/main-navigation/main-navigation.component.html
index 315e658..87fefab 100644
--- a/FrontEnd/src/app/main-navigation/main-navigation.component.html
+++ b/FrontEnd/src/app/main-navigation/main-navigation.component.html
@@ -17,6 +17,6 @@
       <a (click)="navToProfile()"><i class="fas fa-user-circle"></i> Profil</a>
       <a (click)="logout()"><i class="fas fa-sign-out-alt"></i> Wyloguj</a>
     </div>
-      <a *ngIf="isLogin">Witaj, {{currentUser?.username}}!</a>
+      <!--<a *ngIf="isLogin">Witaj, {{currentUser?.username}}!</a>-->
   </div>
 </div>
\ No newline at end of file