在服务器端验证应用内购买 Android/Google答案

【问题标题】：Validate In-App-Purchase Android/Google on Server side在服务器端验证应用内购买 Android/Google
【发布时间】：2013-08-14 11:19:23
【问题描述】：

我想在 Android 应用中使用应用内购买中的购买令牌来验证它到我自己服务器上的谷歌服务器。

使用以下代码，我可以验证令牌，但我每次都必须使用我的 OAuth 凭据对自己进行身份验证：

class GooglePlayVerification
  require 'google/api_client'

  # Refer:
  # https://code.google.com/p/google-api-ruby-client/issues/detail?id=72
  # and
  # http://jonathanotto.com/blog/google_oauth2_api_quick_tutorial.html
  # and
  # http://milancermak.wordpress.com/2012/08/24/server-side-verification-of-google-play-subsc/
  GOOGLE_KEY = 'xxx.apps.googleusercontent.com'
  GOOGLE_SECRET = 'xxxx'
  APP_NAME = 'xx.xx.xx'
  SCOPE = "https://www.googleapis.com/auth/androidpublisher"

  def self.token
    @@token ||= begin
      require 'oauth2'
      raise "Missing client_id variable" if GOOGLE_KEY.to_s.empty?
      raise "Missing client_secret variable" if GOOGLE_SECRET.to_s.empty?
      raise "Missing scope variable" if SCOPE.to_s.empty?

      redirect_uri = 'https://localhost/oauth2callback'

      auth_client_obj = OAuth2::Client.new(GOOGLE_KEY, GOOGLE_SECRET, {:site => 'https://accounts.google.com', :authorize_url => "/o/oauth2/auth", :token_url => "/o/oauth2/token"})

      puts "1) Paste this URL into your browser where you are logged in to the relevant Google account\n\n"
      puts auth_client_obj.auth_code.authorize_url(:scope => SCOPE, :access_type => "offline", :redirect_uri => redirect_uri, :approval_prompt => 'force')

      puts "\n\n\n2) Accept the authorization request from Google in your browser:"

      puts "\n\n\n3) Google will redirect you to localhost, but just copy the code parameter out of the URL they redirect you to, paste it here and hit enter:\n"
      code = gets.chomp.strip

      access_token_obj = auth_client_obj.auth_code.get_token(code, {:redirect_uri => redirect_uri, :token_method => :post})
      puts "Result: #{access_token_obj.inspect}\n\n"
      puts "Token is: #{access_token_obj.token}"
      puts "Refresh token is: #{access_token_obj.refresh_token}"

      {
          :access_token => access_token_obj.token,
          :refresh_token => access_token_obj.refresh_token,
          :expires_in => access_token_obj.expires_in,
          :expires_at => access_token_obj.expires_at
      }
    end
  end

  def self.refresh_token
    refresh_client_obj = OAuth2::Client.new(GOOGLE_KEY, GOOGLE_SECRET, {:site => 'https://accounts.google.com', :authorize_url => '/o/oauth2/auth', :token_url => '/o/oauth2/token'})
    refresh_access_token_obj = OAuth2::AccessToken.new(refresh_client_obj, token[:access_token], {refresh_token: token[:refresh_token]})
    refresh_access_token_obj.refresh!
    puts "refresh token: #{refresh_access_token_obj.inspect}"
    @@token = {
        :access_token => refresh_access_token_obj.token,
        :refresh_token => refresh_access_token_obj.refresh_token,
        :expires_in => refresh_access_token_obj.expires_in,
        :expires_at => refresh_access_token_obj.expires_at
    }
  end


  # ie. https://developers.google.com/android-publisher/v1/
  # eg.
  # @subscription_id com.stocklight.stocklight.standardsubscription
  # @purchase_token  xxx
  def self.verify_subscription(subscription_id, purchase_token)
    response = RestClient.get "https://www.googleapis.com/androidpublisher/v1.1/applications/#{APP_NAME}/inapp/#{subscription_id}/purchases/#{purchase_token}?access_token=#{token[:access_token]}"
    puts "Respnse \n #{response.inspect}"
    puts response.code == 200
    puts JSON.parse(response)

    return response.code == 200 && JSON.parse(response)['kind'] =='androidpublisher#inappPurchase'
  rescue
    return false
  end

end

有没有人知道如何在没有像服务器上的 OAuth 这样的东西的情况下对服务器进行身份验证？是否有其他身份验证的可能性？

谢谢！

【问题讨论】：

好的，我现在知道，这可能不是验证购买的最佳策略。有谁知道如何使用私钥验证购买？我从消费调用中得到响应：{"purchaseToken":"xx.yy-xx-aa--bb-aa","packageName":"de.aa.app","signature":"xxxx","purchaseState":0,"orderId":"xxx.xxxx","purchaseTime":xxxx,"productId":"product_test"} 如何使用来自服务器的公钥验证此请求？感谢您的帮助！
类似问题：stackoverflow.com/questions/5971031/…

标签： ruby oauth-2.0 in-app-purchase google-play google-play-services

【解决方案1】：

这是我的红宝石代码：

def self.verify_subscription(subscription_id, transaction_id)
    json = JSON.parse(transaction_id)
    order = ["orderId", "packageName", "productId", "purchaseTime", "purchaseState", "purchaseToken"]
    signature = json["signature"]
    data = {}
    order.each do |o|
      data[o] = json[o]
    end
    key = OpenSSL::PKey::RSA.new(Base64.decode64(GOOGLE_PUBLIC_KEY))
    verified = key.verify(OpenSSL::Digest::SHA1.new, Base64.decode64(signature), data.to_json)
    verified
end

【讨论】：