Evaluate Javascript code in swift without a webview

Question

so I am writing a radio station app that dynamically loads ads. The original solution was to go to https://cdn.azureradio.com/invocation/clearwater/iOS/the_beat.html in a WebView and then I used Swift Soup and souped the webview for the variables I needed. However, I recently found out that Web Views do not load requests in the background, IE: if the device is locked.

This obviously poses an issue. With that said, I decided on making an HTTP request. I called the url and got a Javascript string. I need to know of a way to run the javascript code and put the html that it generates into a variable so that I can soup the variable. Currently, the Javascript code that I get is

<!-- Azure Spot Server Javascript Tag - Generated with Revive Adserver v5.0.5 -->
<script type='text/javascript'><!--//<![CDATA[
   var m3_u = (location.protocol=='https:'?'https://azureradio.com/ads/www/delivery/ajs.php':'http://azureradio.com/ads/www/delivery/ajs.php');
   var m3_r = Math.floor(Math.random()*99999999999);
   if (!document.MAX_used) document.MAX_used = ',';
   document.write ("<scr"+"ipt type='text/javascript' src='"+m3_u);
   document.write ("?zoneid=7&amp;target=_top");
   document.write ('&amp;cb=' + m3_r);
   if (document.MAX_used != ',') document.write ("&amp;exclude=" + document.MAX_used);
   document.write (document.charset ? '&amp;charset='+document.charset : (document.characterSet ? '&amp;charset='+document.characterSet : ''));
   document.write ("&amp;loc=" + escape(window.location));
   if (document.referrer) document.write ("&amp;referer=" + escape(document.referrer));
   if (document.context) document.write ("&context=" + escape(document.context));
   if (document.mmm_fo) document.write ("&amp;mmm_fo=1");
   document.write ("'><\/scr"+"ipt>");
//]]>--></script>

I have no idea how to run this code in swift to generate a URL without using webView.evaluateJavaScript("document.documentElement.outerHTML.toString()") Thank you very much.

Does this answer your question? Run javascript without UIWebView possible? — timbre timbre
– timbre timbre, Commented May 2, 2020 at 20:32

jshapy8 · Accepted Answer · 2020-05-03 08:11:44Z

3

You can use JavaScriptCore, which is a way to directly access WebKit's JavaScript engine without actually using an instance of a web view.

import JavaScriptCore

let context = JSContext()!
let value = context.evaluateScript(yourJavaScriptString)
print(value)

The value that is returned is the value of the last element that was evaluated.

answered May 3, 2020 at 8:11

jshapy8

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4 Comments

Brian Becker Over a year ago

So I used let context = JSContext()! let value = context.evaluateScript(contents) print(value!) and the issue is it prints undefined, then says "Could not cast value of type 'JSValue' (0x1dec940c8) to 'NSString' (0x1debc2018)."

jshapy8 Over a year ago

@BrianBecker Try to use value.toString() developer.apple.com/documentation/javascriptcore/jsvalue/…

Brian Becker Over a year ago

It is still undefined.

Brian Becker Over a year ago

I decided to put the sleep(4) to allow time for the Javascript to run.

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