Tuesday, 4 February 2014

Safari: Setting third party iframe cookies

Safari is known to be strict about permissions in iframes, especially when the domain of the iframe page is different from the domain of the parent page. Some would even say paranoically strict.

Safari will block you from setting cookies for the third-party domain (the different domain in the iframe), unless you already have cookies set for that domain.

Here's a snippet of javascript I pulled together last week that as a way to get around the iframe cookie security. It works great if your page is nice and light and loads fast, otherwise it can feel pretty clunky with the triple loading...

window.onload=function(){
 if(navigator.userAgent.indexOf('Safari')!=-1&&navigator.userAgent.indexOf('Chrome')==-1){
  var cookies=document.cookie;
  if(top.location!=document.location){
   if(!cookies){
    href=document.location.href;
    href=(href.indexOf('?')==-1)?href+'?':href+'&';
    top.location.href =href+'reref='+encodeURIComponent(document.referrer);
   }
  } else {
   ts=new Date().getTime();document.cookie='ts='+ts;
   rerefidx=document.location.href.indexOf('reref=');
   if(rerefidx!=-1){
    href=decodeURIComponent(document.location.href.substr(rerefidx+6));
    window.location.replace(href);
   }
  }
 }
}

Here's what it basically does:
  • The javascript is placed in the page loaded inside the iframe. 
  • If the JS is run inside the iframe and the browser is Safari and there are no cookies set, then we frame-burst the page to take over the window and append the original parent page URL as a parameter. 
  • If the JS is run not inside a frame and the browser is Safari, then we set a timestamp cookie (now that we are out of the iframe) and if a reref param exists we redirect back to the original page.
  • If the JS is run inside the iframe and the browser is Safari and there ARE cookies set, then we do nothing.

And one more time in pseudo-code

if(browser is Safari){
 if(we are in an iframe){
  if(no cookies){
   set window_url = iframe_url + reref=iframe_parent_url;
  }
 } else {
  set a timestamp cookie;
  if(reref exists in url){
   redirect to original url so we have iframe again
  }
 }
}

161 comments:

  1. This comment has been removed by the author.

    ReplyDelete
  2. I am testing out your code. I am assuming that the part that I have to edit is the one with the interrogation marks inside single quotes?

    Do you know if this works with IE9+? Because I have this issue with IE9.

    ReplyDelete
    Replies
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  3. I can't get this to work.

    If I have domainA.com with iframe loading domainB.com. The javascript above should be in domainB.com, right?

    This is what I have: http://pastie.org/9280470

    ReplyDelete
  4. Thank you. This made a world of difference! :) It worked beautifully!

    ReplyDelete
  5. I am facing issue with triple loading ?Please help me out to avoid that

    ReplyDelete
  6. Thanks.. it works!!

    ReplyDelete
  7. Thank you, it was very helpful!

    ReplyDelete
  8. Since this was geared towards normal GET requests, is there a way that this could be easily modified to handle POST requests?

    I have a web app where the top frame POSTs into the iframe. So the initial call into the iframe is a POST request. Might be hard to carry those POST variables throughout the various redirects.

    ReplyDelete
  9. Hello the JavaScript must be placed into the page where the iframe is referring to ?

    ReplyDelete
  10. This comment has been removed by a blog administrator.

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  12. This comment has been removed by the author.

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  13. Hello and omg, it to hard to understand those complicated settings such as for me. Better to download latest https://yepdownload.com/safari safari windows 8.1 from the begining, than try to understand those codes. I like this browser, from that moment when I start use the iphone, before I applied the chrome every day, but now only safari browser. For me here is convenient the read mode and the confidential system is very high.

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