如何检查用户是否通过API登录到他的谷歌帐户？ [英] How to check whether a user is logged into his google account through API?

问题描述

我正在开发一个页面来显示用户可访问的文档预览。

预览我使用的是iframe，其中src = https://docs.google.com/viewer?authuser=0&srcid= {a document id}

这里的问题是当用户没有登录时显示一个空白的iframe。

如果当前用户没有登录，我想将用户重定向到Google登录页面，然后显示预览文档的页面。

对于此功能，我将首先检查用户是否使用Google登录。

我认为google在iframe的情况下有一些限制，所以它不会重定向到登录页面。

我怎样才能通过API实现它？

解决方案

如果您使用App Engine，请执行以下操作：

要查看显示谷歌文档的页面必须已经检查您是否已经登录。

只要con请指出Google用户-API。一切都在这里描述：

https://developers.google.com/appengine/docs/java/users/overview

并在web.xml中设置安全限制
https://developers.google.com/appengine/docs/java / config / webxml＃Security_and_Authentication

 < security-constraint> 
< web-resource-collection> 
< url-pattern> / page_shows_google_doc< / url-pattern> 
< / web-resource-collection> 
< auth-constraint> 
<角色名称> *< /角色名称> 
< / auth-constraint> 
< / security-constraint> 
  

I am developing a page to show preview of documents accessible to a user.

For previewing I am using an Iframe with src = https://docs.google.com/viewer?authuser=0&srcid={a document id}

The problem here is that when the user is not logged in it shows a blank iframe.

I want to redirect the user to google login page if the current user is not logged in and then display the page previewing the document.

For this functionality I will have to check first that whether the user is logged in with google or not.

I think google has some restrictions imposed in case of iframe so it not redirecting to the login page.

How can I implement it through API?

解决方案

If you use App Engine do it like this:

To view the page which is showing the google doc must already be checking if you are logged in.

Just configure the Google Users-API. Everything is described here:

https://developers.google.com/appengine/docs/java/users/overview

And set the security constraints in web.xml https://developers.google.com/appengine/docs/java/config/webxml#Security_and_Authentication

<security-constraint>
    <web-resource-collection>
        <url-pattern>/page_shows_google_doc</url-pattern>
    </web-resource-collection>
    <auth-constraint>
        <role-name>*</role-name>
    </auth-constraint>
</security-constraint>

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