来自Java/Scala的OAuth2授权，使用google gdata client API

Question

您将如何使用等效的Java api执行与Google .Net示例相同的流程，该小节"执行OAuth 2.0"？

我尝试使用 Java api 模仿的 .Net 示例似乎适合发送 api 请求以创建授权 URL，然后假设我会在浏览器中使用该 URL 来获取访问代码......从而允许服务器端代码此后为该一个Google帐户使用Google Spreadsheets API。

我发现的壁橱Google Java api类是OAuthHelper，但它似乎需要在实例化时userAuthorizationUrl，这实际上是我希望通过自己的createUserAuthorizationUrl方法从它那里获得的，在我设法实例化它之后 - 对我来说有点循环难题。这似乎表明我的假设中缺少一些东西，可能这不是用于模拟 .Net 代码示例的正确类。

非常感谢您的帮助。

Answer 1

看起来 http://soatutorials.blogspot.co.at/2013/08/google-spreadsheet-api-connecting-with.html 有它适用于Java。

Scala 解决方案代码，由 http://javatoscala.com/提供：

package com.articlio.googleApi
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import com.google.gdata.client.GoogleService;
import com.google.gdata.client.authn.oauth.GoogleOAuthHelper;
import com.google.gdata.client.authn.oauth.GoogleOAuthParameters;
import com.google.gdata.client.authn.oauth.OAuthException;
import com.google.gdata.client.authn.oauth.OAuthHmacSha1Signer;
import com.google.gdata.client.authn.oauth.OAuthRsaSha1Signer;
import com.google.gdata.client.authn.oauth.OAuthSigner;
import com.google.gdata.client.spreadsheet.SpreadsheetService;
import com.google.gdata.data.spreadsheet.SpreadsheetFeed
import com.google.gdata.data.BaseEntry;
import com.google.gdata.data.BaseFeed;
import com.google.gdata.data.Feed;
import com.google.gdata.util.AuthenticationException;
import com.google.gdata.util.ServiceException;
//remove if not needed
import scala.collection.JavaConversions._
object OAuth2Sample {
  def loginOAuth2(clientID: String, clientSecret: String) {
    val SCOPES = "https://docs.google.com/feeds https://spreadsheets.google.com/feeds"
    val oauthParameters = new GoogleOAuthParameters
    oauthParameters.setOAuthConsumerKey(clientID) //
    var signer: OAuthSigner = null
    oauthParameters.setOAuthConsumerSecret(clientSecret) //
    signer = new OAuthHmacSha1Signer()
    val oauthHelper = new GoogleOAuthHelper(signer)
    oauthParameters.setScope(SCOPES)
    try {
      oauthHelper.getUnauthorizedRequestToken(oauthParameters)
    } catch {
      case e: OAuthException => e.printStackTrace()
    }
    val requestUrl = oauthHelper.createUserAuthorizationUrl(oauthParameters)
    println(requestUrl)
    println("Please visit the URL above to authorize your OAuth " + 
      "request token.  Once that is complete, press any key to " + 
      "continue...")
    try {
      System.in.read()
    } catch {
      case e: IOException => e.printStackTrace()
    }
    var token: String = null
    try {
      token = oauthHelper.getAccessToken(oauthParameters)
    } catch {
      case e: OAuthException => e.printStackTrace()
    }
    println("OAuth Access Token: " + token)
    println()
    var feedUrl: URL = null
    try {
      feedUrl = new URL("https://spreadsheets.google.com/feeds/spreadsheets/private/full")
    } catch {
      case e: MalformedURLException => e.printStackTrace()
    }
    println("Sending request to " + feedUrl.toString)
    println()
    val googleService = new SpreadsheetService("oauth-sample-app")
    try {
      googleService.setOAuthCredentials(oauthParameters, signer)
    } catch {
      case e: OAuthException => e.printStackTrace()
    }
    val feed = googleService.getFeed(feedUrl, classOf[SpreadsheetFeed])
    val spreadsheets = feed.getEntries
    println("Response Data:")
    println("=====================================================")
    if (spreadsheets != null) {
      for (spreadsheet <- spreadsheets) {
        println(spreadsheet.getTitle.getPlainText)
      }
    }
    println("=====================================================")
    println()
    println("Revoking OAuth Token...")
    try {
      oauthHelper.revokeToken(oauthParameters)
    } catch {
      case e: OAuthException => e.printStackTrace()
    }
    println("OAuth Token revoked...")
  }
}

但是，对于 scala，您目前还需要应用这个...