Merge pull request #1074 from spotify/eide/github-auth

Add github auth

plugins/auth-backend/package.json

@@ -16,21 +16,23 @@
   },
   "dependencies": {
     "@backstage/backend-common": "^0.1.1-alpha.6",
+    "@types/cookie-parser": "^1.4.2",
+    "@types/passport": "^1.0.3",
+    "@types/passport-github2": "^1.2.4",
+    "@types/passport-google-oauth20": "^2.0.3",
     "compression": "^1.7.4",
+    "cookie-parser": "^1.4.5",
     "cors": "^2.8.5",
     "express": "^4.17.1",
     "express-promise-router": "^3.0.3",
     "fs-extra": "^9.0.0",
     "helmet": "^3.22.0",
     "morgan": "^1.10.0",
-    "winston": "^3.2.1",
-    "yn": "^4.0.0",
     "passport": "^0.4.1",
+    "passport-github2": "^0.1.12",
     "passport-google-oauth20": "^2.0.0",
-    "cookie-parser": "^1.4.5",
-    "@types/passport": "^1.0.3",
-    "@types/passport-google-oauth20": "^2.0.3",
-    "@types/cookie-parser": "^1.4.2"
+    "winston": "^3.2.1",
+    "yn": "^4.0.0"
   },
   "devDependencies": {
     "@backstage/cli": "^0.1.1-alpha.6",

plugins/auth-backend/src/providers/OAuthProvider.ts

@@ -124,9 +124,15 @@ export const ensuresXRequestedWith = (req: express.Request) => {
 export class OAuthProvider implements AuthProviderRouteHandlers {
   private readonly provider: string;
   private readonly providerHandlers: OAuthProviderHandlers;
-  constructor(providerHandlers: OAuthProviderHandlers, provider: string) {
+  private readonly disableRefresh: boolean;
+  constructor(
+    providerHandlers: OAuthProviderHandlers,
+    provider: string,
+    disableRefresh?: boolean,
+  ) {
     this.provider = provider;
     this.providerHandlers = providerHandlers;
+    this.disableRefresh = disableRefresh ?? false;
   }
 
   async start(req: express.Request, res: express.Response): Promise<any> {
@@ -164,14 +170,16 @@ export class OAuthProvider implements AuthProviderRouteHandlers {
 
       const { user, info } = await this.providerHandlers.handler(req);
 
-      // throw error if missing refresh token
-      const { refreshToken } = info;
-      if (!refreshToken) {
-        throw new Error('Missing refresh token');
-      }
+      if (!this.disableRefresh) {
+        // throw error if missing refresh token
+        const { refreshToken } = info;
+        if (!refreshToken) {
+          throw new Error('Missing refresh token');
+        }
 
-      // set new refresh token
-      setRefreshTokenCookie(res, this.provider, refreshToken);
+        // set new refresh token
+        setRefreshTokenCookie(res, this.provider, refreshToken);
+      }
 
       // post message back to popup if successful
       return postMessageResponse(res, {
@@ -195,8 +203,10 @@ export class OAuthProvider implements AuthProviderRouteHandlers {
       return res.status(401).send('Invalid X-Requested-With header');
     }
 
-    // remove refresh token cookie before logout
-    removeRefreshTokenCookie(res, this.provider);
+    if (!this.disableRefresh) {
+      // remove refresh token cookie before logout
+      removeRefreshTokenCookie(res, this.provider);
+    }
     return res.send('logout!');
   }
 
@@ -205,6 +215,12 @@ export class OAuthProvider implements AuthProviderRouteHandlers {
       return res.status(401).send('Invalid X-Requested-With header');
     }
 
+    if (!this.providerHandlers.refresh || this.disableRefresh) {
+      return res.send(
+        `Refresh token not supported for provider: ${this.provider}`,
+      );
+    }
+
     try {
       const refreshToken = req.cookies[`${this.provider}-refresh-token`];
 

plugins/auth-backend/src/providers/config.ts

@@ -23,4 +23,13 @@ export const providers = [
       callbackURL: 'http://localhost:7000/auth/google/handler/frame',
     },
   },
+  {
+    provider: 'github',
+    options: {
+      clientID: process.env.AUTH_GITHUB_CLIENT_ID!,
+      clientSecret: process.env.AUTH_GITHUB_CLIENT_SECRET!,
+      callbackURL: 'http://localhost:7000/auth/github/handler/frame',
+    },
+    disableRefresh: true,
+  },
 ];

plugins/auth-backend/src/providers/factories.ts

@@ -14,21 +14,37 @@
  * limitations under the License.
  */
 
-import { AuthProviderFactories, AuthProviderFactory } from './types';
+import {
+  AuthProviderFactories,
+  AuthProviderRouteHandlers,
+  AuthProviderConfig,
+} from './types';
 import { GoogleAuthProvider } from './google';
+import { GithubAuthProvider } from './github';
+import { OAuthProvider } from './OAuthProvider';
 
 export class ProviderFactories {
   private static readonly providerFactories: AuthProviderFactories = {
     google: GoogleAuthProvider,
+    github: GithubAuthProvider,
   };
 
-  public static getProviderFactory(providerId: string): AuthProviderFactory {
+  public static getProviderFactory(
+    config: AuthProviderConfig,
+  ): AuthProviderRouteHandlers {
+    const providerId = config.provider;
     const ProviderImpl = ProviderFactories.providerFactories[providerId];
     if (!ProviderImpl) {
       throw Error(
         `Provider Implementation missing for : ${providerId} auth provider`,
       );
     }
-    return ProviderImpl;
+    const providerInstance = new ProviderImpl(config);
+    const oauthProvider = new OAuthProvider(
+      providerInstance,
+      providerId,
+      config.disableRefresh,
+    );
+    return oauthProvider;
   }
 }

plugins/auth-backend/src/providers/github/index.ts

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * 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.
+ */
+
+export { GithubAuthProvider } from './provider';

plugins/auth-backend/src/providers/github/provider.ts

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * 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.
+ */
+
+import express from 'express';
+import { Strategy as GithubStrategy } from 'passport-github2';
+import {
+  executeFrameHandlerStrategy,
+  executeRedirectStrategy,
+} from '../PassportStrategyHelper';
+import {
+  OAuthProviderHandlers,
+  AuthProviderConfig,
+  RedirectInfo,
+  AuthInfoBase,
+  AuthInfoPrivate,
+} from '../types';
+
+export class GithubAuthProvider implements OAuthProviderHandlers {
+  private readonly providerConfig: AuthProviderConfig;
+  private readonly _strategy: GithubStrategy;
+
+  constructor(providerConfig: AuthProviderConfig) {
+    this.providerConfig = providerConfig;
+    this._strategy = new GithubStrategy(
+      { ...this.providerConfig.options },
+      (accessToken: any, _: any, params: any, profile: any, done: any) => {
+        done(undefined, {
+          profile,
+          accessToken,
+          scope: params.scope,
+          expiresInSeconds: params.expires_in,
+        });
+      },
+    );
+  }
+
+  async start(req: express.Request, options: any): Promise<RedirectInfo> {
+    return await executeRedirectStrategy(req, this._strategy, options);
+  }
+
+  async handler(
+    req: express.Request,
+  ): Promise<{ user: AuthInfoBase; info: AuthInfoPrivate }> {
+    return await executeFrameHandlerStrategy(req, this._strategy);
+  }
+}

plugins/auth-backend/src/providers/index.ts

@@ -17,7 +17,6 @@
 import Router from 'express-promise-router';
 import { AuthProviderRouteHandlers, AuthProviderConfig } from './types';
 import { ProviderFactories } from './factories';
-import { OAuthProvider } from './OAuthProvider';
 
 export const defaultRouter = (provider: AuthProviderRouteHandlers) => {
   const router = Router();
@@ -32,10 +31,7 @@ export const defaultRouter = (provider: AuthProviderRouteHandlers) => {
 
 export const makeProvider = (config: AuthProviderConfig) => {
   const providerId = config.provider;
-  const ProviderImpl = ProviderFactories.getProviderFactory(providerId);
-  const providerInstance = new ProviderImpl(config);
-
-  const oauthProvider = new OAuthProvider(providerInstance, providerId);
+  const oauthProvider = ProviderFactories.getProviderFactory(config);
   const providerRouter = defaultRouter(oauthProvider);
   return { providerId, providerRouter };
 };

plugins/auth-backend/src/providers/types.ts

@@ -20,12 +20,13 @@ import passport from 'passport';
 export type AuthProviderConfig = {
   provider: string;
   options: any;
+  disableRefresh?: boolean;
 };
 
 export interface OAuthProviderHandlers {
   start(req: express.Request, options: any): Promise<any>;
   handler(req: express.Request): Promise<any>;
-  refresh(refreshToken: string, scope: string): Promise<any>;
+  refresh?(refreshToken: string, scope: string): Promise<any>;
   logout?(): Promise<any>;
 }