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# Google APIs Node.js Client

[![Build Status][travisimg]][travis]
[![Code Coverage][coverallsimg]][coveralls]

Google's officially supported [node.js][node] client library for using
Google APIs. It also supports authorization and authentication with OAuth 2.0.

### Alpha

This library is in Alpha. We will make an effort to support the library, but we reserve the right to make incompatible changes when necessary.

### Migrating to version `1.x` of this library

If you've used this library before `1.x`, see our [Migration Guide][migrating]
to learn about migrating your code from `0.x.x` to `1.x`. It's pretty easy :)

### Supported APIs

The full list of supported APIs can be found [here][supported-list]. The API endpoints are automatically generated, so if the API is not in the list, it is currently not supported by this API client library.

### Questions/problems?

* Ask your development related questions on [![Ask a question on Stackoverflow][overflowimg]][stackoverflow]
* If you've found an bug/issue, please [file it on GitHub][bugs].

### Working with Google Cloud APIs?

If you're working with [Google Cloud Platform][cloudplatform] APIs such as
Datastore, Cloud Storage or Pub/Sub, consider using [`gcloud`][gcloud], a
Node idiomatic client for Google Cloud services.

## Installation

This library is distributed on `npm`. In order to add it as a dependency,
run the following command:

``` sh
$ npm install googleapis --save
```

## Usage

Example: Creates a URL Shortener client and retrieves the long url of the
given short url:

``` js
var google = require('googleapis');
var urlshortener = google.urlshortener('v1');

var params = { shortUrl: 'http://goo.gl/xKbRu3' };

// get the long url of a shortened url
urlshortener.url.get(params, function (err, response) {
  console.log('Long url is', response.longUrl);
});
```

### Create a service client

To interact with the various Google APIs you need to create a service client
for that particular API. These are immutable objects you use to make API calls.

Example: Creating a `urlshortener` client with version `v1` of the API.

``` js
var google = require('googleapis');
var urlshortener = google.urlshortener('v1');
```

Supported APIs are listed on the [Google APIs Explorer][apiexplorer].

### Authorizing and Authenticating

This client comes with an [OAuth2][oauth] client that allows you to retrieve an
access token and refreshes the token and retry the request seamlessly if token
is expired. The basics of Google's OAuth2 implementation is explained on
[Google Authorization and Authentication documentation][authdocs].

In the following examples, you may need a `CLIENT_ID`, `CLIENT_SECRET` and
`REDIRECT_URL`. You can find these pieces of information by going to the
[Developer Console][devconsole], clicking your project --> APIs & auth --> credentials.

For more information about OAuth2 and how it works, [see here][oauth].

A complete sample application that authorizes and authenticates with the OAuth2
client is available at [`examples/oauth2.js`][oauthexample].

#### Generating an authentication URL

To ask for permissions from a user to retrieve an access token, you
redirect them to a consent page. To create a consent page URL:

``` js
var google = require('googleapis');
var OAuth2 = google.auth.OAuth2;

var oauth2Client = new OAuth2(CLIENT_ID, CLIENT_SECRET, REDIRECT_URL);

// generate a url that asks permissions for Google+ and Google Calendar scopes
var scopes = [
  'https://www.googleapis.com/auth/plus.me',
  'https://www.googleapis.com/auth/calendar'
];

var url = oauth2Client.generateAuthUrl({
  access_type: 'offline', // 'online' (default) or 'offline' (gets refresh_token)
  scope: scopes // If you only need one scope you can pass it as string
});
```

#### Retrieve authorization code

Once a user has given permissions on the consent page, Google will redirect
the page to the redirect URL you have provided with a code query parameter.

GET /oauthcallback?code={authorizationCode}

#### Retrieve access token

With the code returned, you can ask for an access token as shown below:

``` js
oauth2Client.getToken(code, function(err, tokens) {
  // Now tokens contains an access_token and an optional refresh_token. Save them.
  if(!err) {
    oauth2Client.setCredentials(tokens);
  }
});
```

#### Settings global or service-level auth

You can set the `auth` as a global or service-level option so you don't need to
specify it every request.

Example: Setting a global `auth` option.

``` js
var google = require('googleapis');
var OAuth2 = google.auth.OAuth2;
var oauth2Client = new OAuth2(CLIENT_ID, CLIENT_SECRET, REDIRECT_URL);
google.options({ auth: oauth2Client }); // set auth as a global default
```

Example: Setting a service-level `auth` option.

``` js
var google = require('googleapis');
var OAuth2 = google.auth.OAuth2;
var oauth2Client = new OAuth2(CLIENT_ID, CLIENT_SECRET, REDIRECT_URL);

var drive = google.drive({ version: 'v2', auth: oauth2Client });
```

See the [Options section][options] for more information.

#### Making Authenticated Requests

You can start using OAuth2 to authorize and authenticate your
requests to Google APIs with the retrieved tokens. If you provide a
`refresh_token` and the `access_token` has expired, the `access_token` will be
automatically refreshed and the request is replayed.

Following sample retrieves Google+ profile of the authenticated user.

``` js
var google = require('googleapis');
var plus = google.plus('v1');
var OAuth2 = google.auth.OAuth2;
var oauth2Client = new OAuth2(CLIENT_ID, CLIENT_SECRET, REDIRECT_URL);

// Retrieve tokens via token exchange explained above or set them:
oauth2Client.setCredentials({
  access_token: 'ACCESS TOKEN HERE',
  refresh_token: 'REFRESH TOKEN HERE'
});

plus.people.get({ userId: 'me', auth: oauth2Client }, function(err, response) {
  // handle err and response
});
```

#### Manually refreshing access token

If you need to manually refresh the `access_token` associated with your OAuth2
client, make sure you have a `refresh_token` set in your credentials first and
then call:

``` js
oauth2Client.refreshAccessToken(function(err, tokens) {
  // your access_token is now refreshed and stored in oauth2Client
  // store these new tokens in a safe place (e.g. database)
});
```

#### Using API keys

You may need to send an API key with the request you are going to make.
The following uses an API key to make a request to the Google+ API service to
retrieve a person's profile given a userId:

``` js
var google = require('googleapis');
var plus = google.plus('v1');

var API_KEY = 'ABC123'; // specify your API key here

plus.people.get({ auth: API_KEY, userId: '+google' }, function(err, user) {
  console.log('Result: ' + (err ? err.message : user.displayName));
});
```

Alternatively, you can specify the `key` parameter and it will get used:

``` js
plus.people.get({ key: API_KEY, userId: '+google' }, function(err, user) {
  console.log('Result: ' + (err ? err.message : user.displayName));
});
```

To learn more about API keys, please see the [documentation][usingkeys].

#### Using JWT (Service Tokens)

Configure a JWT auth client with your service account email and the pem file that contains your private key. Google Developers Console only provide `.p12` files, but you can convert a `.p12` to `.pem` with the following command:

``` sh
openssl pkcs12 -in key.p12 -nocerts -passin pass:notasecret -nodes -out key.pem
```

Construct a JWT client, and authenticate your requests.

``` js
var jwtClient = new googleapis.auth.JWT(
  'serviceaccount@email.com',
  '/path/to/key.pem',
  null,
  [scope1, scope2],
  'bar@subjectaccount.com');

jwtClient.authorize(function(err, tokens) {
  if (err) {
    console.log(err);
    return;
  }

// Make an authorized request to list Drive files.
  drive.files.list({ auth: jwtClient }, function(err, resp) {
    // handle err and response
  });
});
```

### Media Uploads

This client supports multipart media uploads. The resource parameters are
specified in the `resource` parameter object, and the media itself is
specified in the `media.body` parameter with mime-type specified in `media.mimeType`.

Example: Upload a plain text file to Google Drive with the title "Test" and
contents "Hello World".

``` js
var drive = google.drive({ version: 'v2', auth: oauth2Client });

drive.files.insert({
  resource: {
    title: 'Test',
    mimeType: 'text/plain'
  },
  media: {
    mimeType: 'text/plain',
    body: 'Hello World'
  }
}, callback);
```

You can also upload media by specifying `media.body` as a [Readable stream][stream].
This can allow you to upload very large files that cannot fit into memory.

Note: Your readable stream may be [unstable][stability]. Use at your own risk.

Example: Upload an image to Google Drive from a readable stream.

``` js
var fs = require('fs');
var drive = google.drive({ version: 'v2', auth: oauth2Client });

drive.files.insert({
  resource: {
    title: 'testimage.png',
    mimeType: 'image/png'
  },
  media: {
    mimeType: 'image/png',
    body: fs.createReadStream('awesome.png') // read streams are awesome!
  }
}, callback);
```

For more examples of creation and modification requests with media attachments,
take a look at the `examples/mediaupload.js` sample.

## Exposing request object

Every request to the API returns a [`request`][request] object, allowing you to track
the request's progress or general information about the request.

``` js
var req = drive.files.insert(/* ... */);
console.log(req.uri.href); // print out the request's URL.
```

## Options

For more fine-tuned control over how your API calls are made,
we provide you with the ability to specify additional options that can
be applied directly to the [`mikeal/request`][request] object used in
this library to make network calls to the API.

You may specify additional options either in the global `google` object or on a
service client basis.

### Available options

The options you specify are attached to the `request` object so whatever
`request` supports, this library supports. You may also specify global or per-service request parameters that will be attached to all API calls you make.

A full list of supported options can be [found here][requestopts].

### Global options

#### Example: Specifying a default proxy and `auth` to be used for each request.

``` js
var google = require('googleapis');
google.options({ proxy: 'http://proxy.example.com', auth: auth });

// All requests made with this object will use these settings unless overridden.
```

#### Example: Specifying global request parameters.

```js
var google = require('googleapis');
google.options({ params: { quotaUser: 'user123@example.com' } });

// All requests from all services will contain the above query parameter
// unless overriden either in a service client or in individual API calls.
```

### Service-client options

You can also specify options when creating a service client.

#### Example: Specifying a default `auth` option (API key or OAuth2 client)

```js
var auth = 'API KEY'; // or you could use oauth2Client
var urlshortener = google.urlshortener({ version: 'v1', auth: auth });

// All requests made with this object will use the specified auth.
```

By doing this, every API call made with this service client will use `'API KEY'`
to authenticate.

**Note:** Created clients are **immutable** so you must create a new one if you
want to specify different options.

#### Example: Specifying default service client query parameters

```js
var urlshortener = google.urlshortener({
  version: 'v1',
  params: { quotaUser: 'user123@example.com' }
});
// All requests made with this service client will contain the
// quotaUser query parameter unless overriden in individual API calls.

// Calls with this drive client will NOT contain the quotaUser query parameter.
var drive = google.drive('v2');
```

### Request-level options

You can specify an `auth` object to be used per request. Each request also
inherits the options specified at the service level and global level.

## License

This library is licensed under Apache 2.0. Full license text is
available in [COPYING][copying].

## Contributing

See [CONTRIBUTING][contributing].

[travisimg]: https://api.travis-ci.org/google/google-api-nodejs-client.svg
[supported-list]: https://developers.google.com/apis-explorer/
[bugs]: https://github.com/google/google-api-nodejs-client/issues
[node]: http://nodejs.org/
[travis]: https://travis-ci.org/google/google-api-nodejs-client
[stackoverflow]: http://stackoverflow.com/questions/tagged/google-api-nodejs-client
[apiexplorer]: https://developers.google.com/apis-explorer
[urlshort]: https://developers.google.com/url-shortener/
[usingkeys]: https://developers.google.com/console/help/#UsingKeys
[contributing]: https://github.com/google/google-api-nodejs-client/tree/master/CONTRIBUTING.md
[copying]: https://github.com/google/google-api-nodejs-client/tree/master/COPYING
[authdocs]: https://developers.google.com/accounts/docs/OAuth2Login
[request]: https://github.com/mikeal/request
[requestopts]: https://github.com/mikeal/request#requestoptions-callback
[stream]: http://nodejs.org/api/stream.html#stream_class_stream_readable
[migrating]: https://github.com/google/google-api-nodejs-client/tree/master/MIGRATING.md
[stability]: http://nodejs.org/api/stream.html#stream_stream
[overflowimg]: https://googledrive.com/host/0ByfSjdPVs9MZbkhjeUhMYzRTeEE/stackoveflow-tag.png
[devconsole]: https://console.developer.google.com
[oauth]: https://developers.google.com/accounts/docs/OAuth2
[oauthexample]: https://github.com/google/google-api-nodejs-client/tree/master/examples/oauth2.js
[options]: https://github.com/google/google-api-nodejs-client/tree/master#options
[gcloud]: https://github.com/GoogleCloudPlatform/gcloud-node
[cloudplatform]: https://developers.google.com/cloud/
[coveralls]: https://coveralls.io/r/google/google-api-nodejs-client?branch=master
[coverallsimg]: https://img.shields.io/coveralls/google/google-api-nodejs-client.svg

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