Javascript injection in WKWebView

FixVideoLinksToHttps.js

var videoTags = document.getElementsByTagName('video');

var result = [];

result.push('====\n')
for (var i = 0; i < videoTags.length; i++)
{
    // result.push("====singleVideoTag \n");
    
    var singleVideoTag = videoTags[i];
    var sourceChildTags = singleVideoTag.getElementsByTagName('source');
    
    for (var j = 0; j < sourceChildTags.length; j++)
    {
        // result.push("==singleSourceTag \n");
        var singleSourceTag = sourceChildTags[j];
        
        var videoSourceUrl =
            singleSourceTag.getAttribute('src')
                           .toString()
                           .trim()
                           .toLowerCase();
         result.push(videoSourceUrl);
        
        
        var isHttp = videoSourceUrl.startsWith('http://');
        
        if (isHttp)
        {
            var httpsSourceUrl = videoSourceUrl.replace('http://', 'https://');
            result.push(httpsSourceUrl);
            
            singleSourceTag.setAttribute('src', httpsSourceUrl);
        }
        else
        {
            result.push('http scheme not found');
        }
        
    }
}
result.push('====\n')

result.toString();