Facebook SDK：有时电子邮件字段返回null（带有“电子邮件”权限集） [英] Facebook SDK : sometimes email field return null ( with "email" permission set )

问题描述

我有一个用PHP编写的Facebook应用程序。被要求用户的电子邮件权限。我注意到，我获得了用户电子邮件地址的 90％，但不是某些。

我知道电子邮件权限允许Facebook App获取主要电子邮件地址在用户个人资料中说明，但为什么SDK有时会返回 null ？

解决方案

email是允许用户在允许应用时不需要给予的扩展权限。如果您需要用户在继续使用应用程序之前授予电子邮件权限，则需要在允许用户在身份验证之后继续工作流程时检查该权限。

您需要使用的图形API端点是/ me / permissions

这是一种方法我使用这样做：

权限是一个表示所请求权限的字符串数组。

  hasPermissions（[email]，function（hasPerms）{
 alert（hasPerms）; 
 }）; 
 
函数hasPermissions（权限，回调）{
 console.log（perms requested）; 
 console.log（permissions）; 
 FB.api（/ me / permissions，function（response）{
 var hasPerms = true; 
 console.log（perms getsd）; 
 console.log （响应）; 
为（var i in permissions）{
 console.log（[permissions [i]] + - + response [data] [0] [permissions [i]] ）
 hasPerms = hasPerms&& response [data] [0] [permissions [i]] == 1; 
} 
 if（typeof callback ==function {
 callback（hasPerms）; 
} 
}）; 
} 
  

I have a Facebook App written in PHP. Asked for user's "email" permission. I noticed that I obtained 90% of user's email address, but not some.

I know that the email permission allows Facebook App to get the primary email address stated in user's profile, but why does the SDK sometimes return null?

解决方案

"email" is an extended permission that users are not required to give when allowing an application. If you need your users to grant the "email" permission before continuing in your app, you need to check that that permission is present before allowing the user to continue his workflow after authentication.

the graph API endpoint you need to use is "/me/permissions"

Here is a method that I use to do just that:

permissions is an array of strings that represent the permissions requested.

hasPermissions(["email"], function(hasPerms){
     alert(hasPerms);
 });

function hasPermissions(permissions, callback){
    console.log("perms requested");
    console.log(permissions);
    FB.api("/me/permissions", function(response){
        var hasPerms = true;
        console.log("perms obtaind");
        console.log(response);
        for(var i in permissions){
            console.log([permissions[i]] + " - " + response["data"][0][permissions[i]])
            hasPerms = hasPerms && response["data"][0][permissions[i]] == 1;
        }
        if(typeof callback == "function"){
            callback(hasPerms);     
        }       
    });
}

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