我如何使用OAuth 2.0授权使用Ruby谷歌的predictive API？

问题描述：

我想简单地发送给谷歌的托管模式sample.sentiment的请求。我无法弄清楚如何通过谷歌使用OAuth 2.0认证，而且我得到无尽的金额小时。如果你能提供给我的code到这将是有益的。以下是我工作过的。

I am trying to simply send a request to google's hosted model sample.sentiment. I cannot figure out how to authorize with Oauth 2.0 via google, and I am getting endless amounts of hours. If you could provide me the code to this is would be helpful. Here is what I am working off of.

client = Google::APIClient.new({:application_name => "CCE",:application_version => "1.0"} )
plus = client.discovered_api('prediction')

# Initialize OAuth 2.0 client    
client.authorization.client_id = 'my client id'
client.authorization.client_secret = 'my client secret'
client.authorization.redirect_uri = 'my callback url'

client.authorization.scope = 'https://www.googleapis.com/auth/prediction'

# Request authorization
redirect_uri = client.authorization.authorization_uri

# Wait for authorization code then exchange for token
client.authorization.code = '....'
client.authorization.fetch_access_token!

# Make an API call
 result = client.execute(
   :api_method => plus.activities.list,
   :parameters => {'hostedModelName' => 'sample.sentiment', 'userId' => ''})

答

好了，在网络上的例子可能会有点混乱，但如果你想利用一台服务器 - 服务器通信 - 这意味着没有最终用户也没有浏览器是参与，那么下面code应该为你工作：

Well, the examples on the web may be a little confusing, but if you want to utilize a server-server communication - meaning that no end-user and no browser is involved, then the following code should work for you:

在prerequisites：

The prerequisites:

您应该产生在你的谷歌API控制台服务帐户键。它会提示你下载一个私钥，你应该在一些地方保存在磁盘上，例如 client.p12 （或使用原来的名字，但为了清楚起见我将使用较短的一个）。

you should generate a "service account" key in your Google API Console. It will prompt you to download a private key, which you should store somewhere on your disk, for example as client.p12 (or use the original name, but for clarity I'll use the shorter one).

client = Google::APIClient.new(
  :application_name => "CCE",
  :application_version => "1.0"
)
prediction = client.discovered_api('prediction', 'v1.5')

key = Google::APIClient::KeyUtils.load_from_pkcs12('client.p12', 'notasecret')

client.authorization = Signet::OAuth2::Client.new(
  :token_credential_uri => 'https://accounts.google.com/o/oauth2/token',
  :audience => 'https://accounts.google.com/o/oauth2/token',
  :scope => 'https://www.googleapis.com/auth/prediction',
  :issuer => '..put here your developer email address from Google API Console..',
  :signing_key => key,
)
client.authorization.fetch_access_token!

# Now you can make the API calls
result = client.execute(...

值得注意的是， client.discovered_api 通话似乎需要的版本号。否则可能会抛出异常'NOTFOUND。

Worth noting is that client.discovered_api call seems to require the version number. otherwise it may be throwing an exception 'NotFound'.

该密码是真正的字符串' notasecret '！

The passphrase is really the string 'notasecret'!

另一件事：在API调用确保您调用适当的方法 - 托管模式，我相信你可以调用的唯一方法就是：的api_method =＆GT; prediction.hostedmodels。predict 或这样的事情。我没有用托管的模型呢。的（详见API文档）

Another thing: in API call make sure that you call the proper method - for hosted models I believe the only method you can call is :api_method => prediction.hostedmodels.predict or something like this. I've not used hosted models yet. (see the API docs for details)

在结果的 client.execute 调用返回的可能是有趣的字段是：

The possibly interesting fields of the result returned by the client.execute call are:

result.status
result.data['error']['errors'].map{|e| e['message']} # if they exist
JSON.parse(result.body)

如果您检查他们，他们可能会显著帮助你在调试任何问题。

If you inspect them, they will probably help you significantly in debugging any problems.

我如何使用OAuth 2.0授权使用Ruby谷歌的predictive API？

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