150 lines
5.5 KiB
Markdown
150 lines
5.5 KiB
Markdown
# Google API Client
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<dl>
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<dt>Homepage</dt><dd><a href="http://code.google.com/p/google-api-ruby-client">http://code.google.com/p/google-api-ruby-client</a></dd>
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<dt>Author</dt><dd><a href="mailto:bobaman@google.com">Bob Aman</a></dd>
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<dt>Copyright</dt><dd>Copyright © 2011 Google, Inc.</dd>
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<dt>License</dt><dd>Apache 2.0</dd>
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</dl>
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[](http://travis-ci.org/google/google-api-ruby-client)
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[](https://gemnasium.com/google/google-api-ruby-client)
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## Description
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The Google API Ruby Client makes it trivial to discover and access supported
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APIs.
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## Install
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Be sure `http://rubygems.org/` is in your gem sources.
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For normal client usage, this is sufficient:
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$ sudo gem install google-api-client
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The command line interface, the example applications, and the test suite
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require additional dependencies. These may be obtained with:
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$ sudo gem install google-api-client --development --force --no-rdoc --no-ri
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## Example Usage
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# Initialize the client & Google+ API
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require 'google/api_client'
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client = Google::APIClient.new
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plus = client.discovered_api('plus')
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# Initialize OAuth 2.0 client
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client.authorization.client_id = '<CLIENT_ID_FROM_API_CONSOLE>'
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client.authorization.client_secret = '<CLIENT_SECRET>'
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client.authorization.redirect_uri = '<YOUR_REDIRECT_URI>'
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client.authorization.scope = 'https://www.googleapis.com/auth/plus.me'
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# Request authorization
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redirect_uri = client.authorization.authorization_uri
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# Wait for authorization code then exchange for token
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client.authorization.code = '....'
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client.authorization.fetch_access_token!
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# Make an API call
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result = client.execute(
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:api_method => plus.activities.list,
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:parameters => {'collection' => 'public', 'userId' => 'me'}
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)
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puts result.data
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## API Features
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### API Discovery
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To take full advantage of the client, load API definitions prior to use. To load an API:
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urlshortener = client.discovered_api('urlshortener')
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Specific versions of the API can be loaded as well:
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drive = client.discovered_api('drive', 'v2')
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Locally cached discovery documents may be used as well. To load an API from a local file:
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doc = File.read('my-api.json')
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my_api = client.register_discovery_document('myapi', 'v1', doc)
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### Authorization
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Most interactions with Google APIs require users to authorize applications via OAuth 2.0. The client library uses [Signet](https://github.com/google/signet) to handle most aspects of authorization. For additional details about Google's OAuth support, see [Google Developers](https://developers.google.com/accounts/docs/OAuth2).
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Credentials can be managed at the connection level, as shown, or supplied on a per-request basis when calling `execute`.
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For server-to-server interactions, like those between a web application and Google Cloud Storage, Prediction, or BigQuery APIs, use service accounts. Assertions for service accounts are made with `Google::APIClient::JWTAsserter`.
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client = Google::APIClient.new
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key = Google::APIClient::PKCS12.load_key('client.p12', 'notasecret')
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service_account = Google::APIClient::JWTAsserter(
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'123456-abcdef@developer.gserviceaccount.com',
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'https://www.googleapis.com/auth/prediction',
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key)
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client.authorization = service_account.authorize
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### Batching Requests
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Some Google APIs support batching requests into a single HTTP request. Use `Google::APIClient::BatchRequest`
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to bundle multiple requests together.
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Example:
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client = Google::APIClient.new
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urlshortener = client.discovered_api('urlshortner')
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batch = Google::APIClient::BatchRequest.new do |result|
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puts result.data
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end
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batch.add(:api_method=>urlshortener.url.insert,
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:body_object => { 'longUrl' => 'http://example.com/foo' })
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batch.add(:api_method=>urlshortener.url.insert,
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:body_object => { 'longUrl' => 'http://example.com/bar' })
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client.execute(batch)
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Blocks for handling responses can be specified either at the batch level or when adding an individual API call. For example:
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batch.add(:api_method=>urlshortener.url.insert, :body_object => { 'longUrl' => 'http://example.com/bar' }) do |result|
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puts result.data
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end
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### Media Upload
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For APIs that support file uploads, use `Google::APIClient::UploadIO` to load the stream. Both multipart and resumable
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uploads can be used. For example, to upload a file to Google Drive using multipart
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drive = client.discovered_api('drive', 'v2')
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media = Google::APIClient::UploadIO.new('mymovie.m4v', 'video/mp4')
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metadata = {
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'title' => 'My movie',
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'description' => 'The best home movie ever made'
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}
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client.execute(:api_method => drive.files.insert,
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:parameters => { 'uploadType' => 'multipart' },
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:body_object => metadata,
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:media => media )
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To use resumable uploads, change the `uploadType` parameter to `resumable`. To check the status of the upload
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and continue if necessary, check `result.resumable_upload`.
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client.execute(:api_method => drive.files.insert,
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:parameters => { 'uploadType' => 'resumable' },
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:body_object => metadata,
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:media => media )
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upload = result.resumable_upload
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# Resume if needed
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if upload.resumable?
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client.execute(upload)
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end
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