如何在授权后正确重定向到Facebook页面选项卡URL

Question

我改变了我的Facebook页面标签应用程序要求权限的方式.

我正在使用FB Dialog的javascript方法,现在我正在使用重定向方法(其中用户被重定向到FB页面,其中要求权限,然后被重定向回到Facebook页面选项卡).

改变的原因是我相信这种方法比使用javascript对话框会带来更少的错误和问题.

使用重定向方法时,我需要指定在提供权限后用户将被重定向的URL.我想这个网址是安装了应用程序的Facebook页面标签的网址.

构建重定向的URL时,我知道当前的page_id和我的app_id.有了这些信息,我需要构建facebook页面选项卡url,它应该如下所示:

https://www.facebook.com/pages/PAGE-SLUG/ {#APP_ID}？sk = app _ {#APPL_ID}

问题是我不知道什么是PAGE-SLUG.我用上面的url运行的测试(使用PAGE-SLUG作为任何东西)最终重定向到正确的URL.但是,知道Facebook是一个非常不稳定的平台,我想知道有更好的方法来构建这个重定向网址.

编辑:上述方法有问题.默认情况下,当facebook用户不使用SSL时,重定向会丢失SSL协议并使用HTTP链接.

Answer 1

实际上非常简单,您可以使用PHP调用Graph API,如下所示:

$facebook->api("/{PAGE_ID}"); 
// change {PAGE_ID} to the page id you are redirecting back to

返回值是一个带有"link"的json数组 - >这是你要查找的URL :-)

示例返回:

{
  "id": "XXXXXXXXX", 
  "name": "My Demo Page", 
  "picture": "", 
  "link": "https://www.facebook.com/pages/My-Demo-Page/XXXXXXXXX", 
  "likes": 123456, 
  "category": "Product/service", 
  "can_post": true, 
  "type": "page"
}

如果您知道,也可以按页面名称查询,例如:

通过以下方式查询Graph API:

$facebook->api("/coca-cola"); 

将导致:

{
  "id": "40796308305", 
  "name": "Coca-Cola", 
  "picture": "https://fbcdn-profile-a.akamaihd.net/hprofile-ak-snc4/174560_40796308305_2093137831_s.jpg", 
  "link": "https://www.facebook.com/coca-cola", 
  "likes": 40680159, 
  "cover": {
    "cover_id": "10150682306963306", 
    "source": "https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-snc7/s720x720/416803_10150682306963306_40796308305_9337341_812683101_n.jpg", 
    "offset_y": 0
  }, 
  "category": "Food/beverages", 
  "is_published": true, 
  "website": "http://www.coca-cola.com", 
  "username": "coca-cola", 
  "founded": "1886", 
  "description": "Created in 1886 in Atlanta, Georgia, by Dr. John S. Pemberton, Coca-Cola was first offered as a fountain beverage at Jacob's Pharmacy by mixing Coca-Cola syrup with carbonated water. \n\nCoca-Cola was patented in 1887, registered as a trademark in 1893 and by 1895 it was being sold in every state and territory in the United States. In 1899, The Coca-Cola Company began franchised bottling operations in the United States. \n\nCoca-Cola might owe its origins to the United States, but its popularity has made it truly universal. Today, you can find Coca-Cola in virtually every part of the world.", 
  "about": "The Coca-Cola Facebook Page is a collection of your stories showing how people from around the world have helped make Coke into what it is today.", 
  "location": {
    "latitude": -33.816989983333, 
    "longitude": 150.84844081667
  }, 
  "can_post": true, 
  "checkins": 80, 
  "talking_about_count": 297576, 
  "type": "page"
}

编辑:

一个更清楚的解释:

1. 使用当前页面ID调用Graph API.
2. 如果结果为false,则redirect_uri将是从调用返回的链接.否则,redirect_uri应该是yourdomain.com/middle-page.php?page_id=XXX
3. 如果用户接受应用程序并且redirect_uri是中间页面,则再次调用Graph API,但这次,您使用从Facebook收到的访问令牌.现在您应该拥有真正的页面网址,并且可以添加所需的任何其他详细信息(例如？sk_app = APP_ID)

根据Facebook自己的文档,如果用户决定不接受该应用程序,则不清楚会发生什么.我认为用户将重定向回redirect_uri,然后您可以检查signed_request中是否有"user_id",但我不是100%确定... 创建一个简单的应用程序演示并检查:-)