Oauth重定向返回没有'Access-Control-Allow-Origin'标头出现在请求的资源上

Question

我目前正在我的React and Play应用程序中使用LinkedIn实现OAuth登录,并且在尝试重定向到我的开发环境中的授权页面时遇到了CORS错误:

XMLHttpRequest cannot load https://www.linkedin.com/oauth/v2/authorization?response_type=code&client_i…basicprofile&redirect_uri=http%3A%2F%2Flocalhost%3A9000%2Fusers%2Flinkedin. Redirect from 'https://www.linkedin.com/oauth/v2/authorization?response_type=code&client_i…basicprofile&redirect_uri=http%3A%2F%2Flocalhost%3A9000%2Fusers%2Flinkedin' to 'https://www.linkedin.com/uas/login?session_redirect=%2Foauth%2Fv2%2Flogin-s…' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.

我有以下设置:

• 在localhost:9000上运行的播放服务器
• 在localhost:3000运行的React app(通过create-react-app创建)

我的JS代码调用/auth/linkedin端点,实现如下:

Action { implicit req: RequestHeader =>
  val csrfToken = CSRF.getToken.get.value
  Redirect(linkedinUrl(oauthConfig.linkedinClientId, csrfToken)).withSession("state" -> csrfToken)
}

我将Play应用程序设置为适当地处理CORS.

我的反应应用程序只是通过Axios向上述端点发出请求:

axios.get('/auth/linkedin')

这回复303并重定向到LinkedIn auth页面然后给我错误.

如何在此开发设置中正确使用CORS策略？我已经尝试将以下内容添加到我的package.json中,因为create-react-app文档建议:

"proxy": "http://localhost:9000",

我还尝试"Access-Control-Allow-Origin" : "*"在Play服务器的重定向上设置请求标头但没有成功.

请注意,转到localhost:9000/auth/linkedin可以正确重定向.

Answer 1

https://www.linkedin.com/oauth/v2/authorization响应显然不包含Access-Control-Allow-Origin响应标头,因为它们没有,您的浏览器阻止您的前端JavaScript代码访问响应.

您无法对自己的前端JavaScript代码或后端配置设置进行任何更改,这些设置将允许您的前端JavaScript代码以您直接尝试https://www.linkedin.com/oauth/v2/authorization并成功获得响应的方式发出请求.

https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS更详细地解释,但它的要点是,对于CORS,请求发送到的服务器必须配置为发送Access-Control-Allow-Origin响应标头,也不是你自己的后端服务器.

无论如何https://developer.linkedin.com/docs/getting-started-js-sdk有官方文档解释如何请求用户跨域的授权,这似乎是这样的:

<script type="text/javascript" src="//platform.linkedin.com/in.js">
    api_key:   [API_KEY]
    onLoad:    [ONLOAD]
    authorize: [AUTHORIZE]
    lang:      [LANG_LOCALE]

IN.User.authorize(callbackFunction, callbackScope);
</script>

并且https://developer.linkedin.com/docs/signin-with-linkedin还有其他auth流的文档:

<script type="in/Login"></script> <!-- Create the "Sign In with LinkedIn" button-->

<!-- Handle async authentication & retrieve basic member data -->
<script type="text/javascript">

    // Setup an event listener to make an API call once auth is complete
    function onLinkedInLoad() {
        IN.Event.on(IN, "auth", getProfileData);
    }

    // Handle the successful return from the API call
    function onSuccess(data) {
        console.log(data);
    }

    // Handle an error response from the API call
    function onError(error) {
        console.log(error);
    }

    // Use the API call wrapper to request the member's basic profile data
    function getProfileData() {
        IN.API.Raw("/people/~").result(onSuccess).error(onError);
    }

</script>