如何通过API检查用户是否登录了他的谷歌账户? [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以访问的文档的预览.

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

为了预览，我使用的是 src = https://docs.google.com/viewer?authuser=0&srcid={文档ID}

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

这里的问题是，当用户未登录时，它会显示一个空白 iframe.

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

如果当前用户未登录，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.

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.

对于这个功能，我必须首先检查用户是否使用谷歌登录.

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

我认为谷歌在 iframe 的情况下施加了一些限制，因此它不会重定向到登录页面.

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

如何通过API实现?

推荐答案

如果您使用 App Engine，请这样做:

If you use App Engine do it like this:

要查看显示 google 文档的页面，您必须已经在检查您是否已登录.

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

只需配置 Google 用户 API.一切都在这里描述:

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

https://developers.google.com/appengine/docs/java/用户/概述

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

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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