add refresh token method in auth service

src/api/auth.js

@@ -46,6 +46,14 @@ export default class Auth {
         });
     }
 
+    refreshToken() {
+        const config = this.storage.json();
+        const token = this.storage.getToken();
+        return Auth._requestNewToken({token: token.name}, config).then(token => {
+            this.storage.saveToken(token)
+        })
+    }
+
     static _requestNewToken(token, config = {}) {
         return axios.post('/api/tokens/refresh/', token, config).then(response => {
             return response.data.token;

test/auth.js

@@ -84,3 +84,14 @@ test('login custom endpoint', t => {
         t.is(JSON.parse(storage.getItem(LOCAL_STORAGE_KEY)).jwt, token);
     });
 });
+
+test('refresh token', t => {
+    const token = '3e3231';
+    const storage = new LocalStorageMock();
+    const auth = AuthFactory(token, storage);
+    const newToken = 'wibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9eyJzdWIiOiIxMjM0NTY3ODkwIi';
+    nock('https://lesspass.com').post('/api/tokens/refresh/', {token}).reply(200, {token: newToken});
+    return auth.refreshToken().then(() => {
+        t.is(JSON.parse(storage.getItem(LOCAL_STORAGE_KEY)).jwt, newToken);
+    });
+});