feat(authentication-jwt): implementing refresh token

Refresh token implementation through interceptor

extensions/authentication-jwt/package.json

@@ -19,6 +19,7 @@
   "license": "MIT",
   "dependencies": {
     "@loopback/authentication": "^4.2.5",
+    "@loopback/context": "^3.8.1",
     "@loopback/core": "^2.7.0",
     "@loopback/openapi-v3": "^3.4.1",
     "@loopback/rest": "^5.0.1",

extensions/authentication-jwt/src/__tests__/acceptance/jwt.component.test.ts

@@ -15,13 +15,15 @@ import {UserServiceBindings} from '../..';
 import {OPERATION_SECURITY_SPEC, SECURITY_SCHEME_SPEC} from '../../';
 import {UserRepository} from '../../repositories';
 import {TestApplication} from '../fixtures/application';
+import {RefreshTokenBindings} from '../../keys';
 
 describe('jwt authentication', () => {
   let app: TestApplication;
   let client: Client;
   let token: string;
   let userRepo: UserRepository;
-
+  let refreshToken: string;
+  let tokenAuth: string;
   before(givenRunningApplication);
   before(() => {
     client = createRestAppClient(app);
@@ -50,6 +52,29 @@ describe('jwt authentication', () => {
     expect(spec.components?.securitySchemes).to.eql(SECURITY_SCHEME_SPEC);
   });
 
+  it(`user login and token granted successfully`, async () => {
+    const credentials = {email: '[email protected]', password: 'opensesame'};
+    const res = await client
+      .post('/users/refresh/login')
+      .send(credentials)
+      .expect(200);
+    refreshToken = res.body.refreshToken;
+  });
+
+  it(`user sends refresh token and new access token issued`, async () => {
+    const tokenArg = {refreshToken: refreshToken};
+    const res = await client.post('/refresh/').send(tokenArg).expect(200);
+    tokenAuth = res.body.accessToken;
+  });
+
+  it('whoAmI returns the login user id using token generated from refresh', async () => {
+    const res = await client
+      .get('/whoAmI')
+      .set('Authorization', 'Bearer ' + tokenAuth)
+      .expect(200);
+    expect(res.text).to.equal('f48b7167-8d95-451c-bbfc-8a12cd49e763');
+  });
+
   /*
    ============================================================================
    TEST HELPERS

extensions/authentication-jwt/src/__tests__/fixtures/application.ts

@@ -14,6 +14,7 @@ import path from 'path';
 import {JWTAuthenticationComponent, UserServiceBindings} from '../../';
 import {DbDataSource} from './datasources/db.datasource';
 import {MySequence} from './sequence';
+import {RefreshTokenBindings} from '../../keys';
 
 export class TestApplication extends BootMixin(
   ServiceMixin(RepositoryMixin(RestApplication)),
@@ -34,6 +35,7 @@ export class TestApplication extends BootMixin(
     this.component(JWTAuthenticationComponent);
     // Bind datasource
     this.dataSource(DbDataSource, UserServiceBindings.DATASOURCE_NAME);
+    this.dataSource(DbDataSource, RefreshTokenBindings.DATASOURCE_NAME);
 
     this.component(RestExplorerComponent);
     this.projectRoot = __dirname;

extensions/authentication-jwt/src/__tests__/fixtures/controllers/user.controller.ts

@@ -8,10 +8,17 @@ import {
   TokenService,
   UserService,
 } from '@loopback/authentication';
-import {inject} from '@loopback/core';
+import {inject, intercept} from '@loopback/core';
 import {get, post, requestBody} from '@loopback/rest';
 import {SecurityBindings, securityId, UserProfile} from '@loopback/security';
-import {TokenServiceBindings, User, UserServiceBindings} from '../../../';
+import {
+  TokenServiceBindings,
+  User,
+  UserServiceBindings,
+  RefreshGrantRequestBody,
+  RefreshGrant,
+  TokenObject,
+} from '../../../';
 import {Credentials} from '../../../services/user.service';
 
 const CredentialsSchema = {
@@ -95,4 +102,70 @@ export class UserController {
   async whoAmI(): Promise<string> {
     return this.user[securityId];
   }
+
+  @post('/users/refresh/login', {
+    responses: {
+      '200': {
+        description: 'Token',
+        content: {
+          'application/json': {
+            schema: {
+              type: 'object',
+              properties: {
+                accessToken: {
+                  type: 'string',
+                },
+                refreshToken: {
+                  type: 'string',
+                },
+              },
+            },
+          },
+        },
+      },
+    },
+  })
+  @intercept('refresh-token-generate')
+  async refreshLogin(
+    @requestBody(CredentialsRequestBody) credentials: Credentials,
+  ): Promise<TokenObject> {
+    // ensure the user exists, and the password is correct
+    const user = await this.userService.verifyCredentials(credentials);
+    // convert a User object into a UserProfile object (reduced set of properties)
+    const userProfile: UserProfile = this.userService.convertToUserProfile(
+      user,
+    );
+    // create a JSON Web Token based on the user profile
+    const token = {
+      accessToken: await this.jwtService.generateToken(userProfile),
+    };
+    return token;
+  }
+
+  @post('/refresh', {
+    responses: {
+      '200': {
+        description: 'Token',
+        content: {
+          'application/json': {
+            schema: {
+              type: 'object',
+              properties: {
+                refreshToken: {
+                  type: 'string',
+                },
+              },
+            },
+          },
+        },
+      },
+    },
+  })
+  @intercept('refresh-token-grant')
+  async refresh(
+    @requestBody(RefreshGrantRequestBody) refreshGrant: RefreshGrant,
+  ): Promise<{token: string}> {
+    const token = '';
+    return {token};
+  }
 }

extensions/authentication-jwt/src/__tests__/unit/jwt.service.ts

@@ -4,7 +4,7 @@
 // License text available at https://opensource.org/licenses/MIT
 
 import {HttpErrors} from '@loopback/rest';
-import {securityId} from '@loopback/security';
+import {securityId, UserProfile} from '@loopback/security';
 import {expect} from '@loopback/testlab';
 import {JWTService} from '../../';
 
@@ -19,9 +19,17 @@ describe('token service', () => {
     id: '1',
     name: 'test',
   };
+  type Setter<T> = (value?: T) => void;
   const TOKEN_SECRET_VALUE = 'myjwts3cr3t';
   const TOKEN_EXPIRES_IN_VALUE = '60';
-  const jwtService = new JWTService(TOKEN_SECRET_VALUE, TOKEN_EXPIRES_IN_VALUE);
+  const setCurrentUser: Setter<UserProfile> = userProfile => {
+    return userProfile;
+  };
+  const jwtService = new JWTService(
+    TOKEN_SECRET_VALUE,
+    TOKEN_EXPIRES_IN_VALUE,
+    setCurrentUser,
+  );
 
   it('token service generateToken() succeeds', async () => {
     const token = await jwtService.generateToken(USER_PROFILE);

extensions/authentication-jwt/src/interceptors/index.ts

@@ -0,0 +1,3 @@
+export * from './refresh-token-generate.interceptor';
+
+export * from './refresh-token-grant.interceptor';

extensions/authentication-jwt/src/interceptors/refresh-token-generate.interceptor.ts

@@ -0,0 +1,84 @@
+import {
+  Getter,
+  inject,
+  Interceptor,
+  InvocationContext,
+  InvocationResult,
+  Provider,
+  uuid,
+  ValueOrPromise,
+} from '@loopback/context';
+import {repository} from '@loopback/repository';
+import {SecurityBindings, UserProfile} from '@loopback/security';
+import {promisify} from 'util';
+import {RefreshTokenRepository} from '../repositories';
+import {RefreshTokenInterceptorBindings} from '../keys';
+import {HttpErrors} from '@loopback/rest';
+
+/**
+ * This class will be bound to the application as an `Interceptor` during
+ * `boot`
+ */
+const jwt = require('jsonwebtoken');
+const signAsync = promisify(jwt.sign);
+export class RefreshTokenGenerateInterceptor implements Provider<Interceptor> {
+  constructor(
+    @inject(RefreshTokenInterceptorBindings.REFRESH_SECRET)
+    private refreshSecret: string,
+    @inject(RefreshTokenInterceptorBindings.REFRESH_EXPIRES_IN)
+    private refreshExpiresIn: string,
+    @inject(RefreshTokenInterceptorBindings.REFRESH_ISSURE)
+    private refreshIssure: string,
+    @repository(RefreshTokenRepository)
+    public refreshTokenRepository: RefreshTokenRepository,
+    @inject.getter(SecurityBindings.USER, {optional: true})
+    private getCurrentUser: Getter<UserProfile>,
+  ) {}
+
+  /**
+   * This method is used by LoopBack context to produce an interceptor function
+   * for the binding.
+   *
+   * @returns An interceptor function
+   */
+  value() {
+    return this.intercept.bind(this);
+  }
+
+  /**
+   * The logic to intercept an invocation
+   * @param invocationCtx - Invocation context
+   * @param next - A function to invoke next interceptor or the target method
+   */
+  async intercept(
+    invocationCtx: InvocationContext,
+    next: () => ValueOrPromise<InvocationResult>,
+  ) {
+    try {
+      // Add pre-invocation logic here
+      let result = await next();
+      // Add post-invocation logic here
+      const currentUser = await this.getCurrentUser();
+      const data = {
+        token: uuid(),
+      };
+      const refreshToken = await signAsync(data, this.refreshSecret, {
+        expiresIn: Number(this.refreshExpiresIn),
+        issuer: this.refreshIssure,
+      });
+      result = Object.assign(result, {
+        refreshToken: refreshToken,
+      });
+      await this.refreshTokenRepository.create({
+        userId: currentUser.id,
+        refreshToken: result.refreshToken,
+      });
+      return result;
+    } catch (error) {
+      // Add error handling logic here
+      throw new HttpErrors.Unauthorized(
+        `Error verifying token : ${error.message}`,
+      );
+    }
+  }
+}