GoogleOauth2.0 First implementation

First try for GoogleOauth2.0

express-server/node_modules/passport-oauth2/README.md

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+# passport-oauth2
+
+[![Build](https://img.shields.io/travis/jaredhanson/passport-oauth2.svg)](https://travis-ci.org/jaredhanson/passport-oauth2)
+[![Coverage](https://img.shields.io/coveralls/jaredhanson/passport-oauth2.svg)](https://coveralls.io/r/jaredhanson/passport-oauth2)
+[![Quality](https://img.shields.io/codeclimate/github/jaredhanson/passport-oauth2.svg?label=quality)](https://codeclimate.com/github/jaredhanson/passport-oauth2)
+[![Dependencies](https://img.shields.io/david/jaredhanson/passport-oauth2.svg)](https://david-dm.org/jaredhanson/passport-oauth2)
+
+
+General-purpose OAuth 2.0 authentication strategy for [Passport](http://passportjs.org/).
+
+This module lets you authenticate using OAuth 2.0 in your Node.js applications.
+By plugging into Passport, OAuth 2.0 authentication can be easily and
+unobtrusively integrated into any application or framework that supports
+[Connect](http://www.senchalabs.org/connect/)-style middleware, including
+[Express](http://expressjs.com/).
+
+Note that this strategy provides generic OAuth 2.0 support.  In many cases, a
+provider-specific strategy can be used instead, which cuts down on unnecessary
+configuration, and accommodates any provider-specific quirks.  See the
+[list](https://github.com/jaredhanson/passport/wiki/Strategies) for supported
+providers.
+
+Developers who need to implement authentication against an OAuth 2.0 provider
+that is not already supported are encouraged to sub-class this strategy.  If you
+choose to open source the new provider-specific strategy, please add it to the
+list so other people can find it.
+
+## Install
+
+    $ npm install passport-oauth2
+
+## Usage
+
+#### Configure Strategy
+
+The OAuth 2.0 authentication strategy authenticates users using a third-party
+account and OAuth 2.0 tokens.  The provider's OAuth 2.0 endpoints, as well as
+the client identifer and secret, are specified as options.  The strategy
+requires a `verify` callback, which receives an access token and profile,
+and calls `cb` providing a user.
+
+```js
+passport.use(new OAuth2Strategy({
+    authorizationURL: 'https://www.example.com/oauth2/authorize',
+    tokenURL: 'https://www.example.com/oauth2/token',
+    clientID: EXAMPLE_CLIENT_ID,
+    clientSecret: EXAMPLE_CLIENT_SECRET,
+    callbackURL: "http://localhost:3000/auth/example/callback"
+  },
+  function(accessToken, refreshToken, profile, cb) {
+    User.findOrCreate({ exampleId: profile.id }, function (err, user) {
+      return cb(err, user);
+    });
+  }
+));
+```
+
+#### Authenticate Requests
+
+Use `passport.authenticate()`, specifying the `'oauth2'` strategy, to
+authenticate requests.
+
+For example, as route middleware in an [Express](http://expressjs.com/)
+application:
+
+```js
+app.get('/auth/example',
+  passport.authenticate('oauth2'));
+
+app.get('/auth/example/callback',
+  passport.authenticate('oauth2', { failureRedirect: '/login' }),
+  function(req, res) {
+    // Successful authentication, redirect home.
+    res.redirect('/');
+  });
+```
+
+## Related Modules
+
+- [passport-oauth1](https://github.com/jaredhanson/passport-oauth1) — OAuth 1.0 authentication strategy
+- [passport-http-bearer](https://github.com/jaredhanson/passport-http-bearer) — Bearer token authentication strategy for APIs
+- [OAuth2orize](https://github.com/jaredhanson/oauth2orize) — OAuth 2.0 authorization server toolkit
+
+## Contributing
+
+#### Tests
+
+The test suite is located in the `test/` directory.  All new features are
+expected to have corresponding test cases.  Ensure that the complete test suite
+passes by executing:
+
+```bash
+$ make test
+```
+
+#### Coverage
+
+All new feature development is expected to have test coverage.  Patches that
+increse test coverage are happily accepted.  Coverage reports can be viewed by
+executing:
+
+```bash
+$ make test-cov
+$ make view-cov
+```
+
+## Support
+
+#### Funding
+
+This software is provided to you as open source, free of charge.  The time and
+effort to develop and maintain this project is dedicated by [@jaredhanson](https://github.com/jaredhanson).
+If you (or your employer) benefit from this project, please consider a financial
+contribution.  Your contribution helps continue the efforts that produce this
+and other open source software.
+
+Funds are accepted via [PayPal](https://paypal.me/jaredhanson), [Venmo](https://venmo.com/jaredhanson),
+and [other](http://jaredhanson.net/pay) methods.  Any amount is appreciated.
+
+## License
+
+[The MIT License](http://opensource.org/licenses/MIT)
+
+Copyright (c) 2011-2016 Jared Hanson <[http://jaredhanson.net/](http://jaredhanson.net/)>