Interesting webpage injection scripts

PAGE-SCRIPTS.md

Youtube -> Imgur Screenshot Helper (copy and paste into your browser console when on a video site)

var clientId = ''; // insert your imgur application client id here
var videos = document.getElementsByTagName('video'), canvas = document.createElement('canvas'), context = canvas.getContext('2d'), http = new XMLHttpRequest();
canvas.width = videos[0].videoWidth; canvas.height = videos[0].videoHeight;
context.drawImage(videos[0], 0, 0);

var data = JSON.stringify({
  image: canvas.toDataURL('image/jpeg', 0.9).split(',')[1]
});

//Send the proper header information along with the request
http.open('POST', 'https://api.imgur.com/3/image', true);
http.setRequestHeader('Content-type','application/json; charset=utf-8');
// http.setRequestHeader('Content-length', data.length);
http.setRequestHeader('Authorization', 'Client-ID ' + clientId);
// http.setRequestHeader('Connection', "close");

http.onreadystatechange = function() {//Call a function when the state changes.
    if(http.readyState == 4 && http.status == 200) {
       try {
          console.log(JSON.parse(http.responseText).data.link);
       }
       catch (e) {
       }
    }
}

http.send(data);

Get a the base64 image/jpeg data for an image that you've inspected from a site. Need to make sure that the image has been served from the same domain as the page. Basically, inspect the element and then copy and paste this code into devtools console in chrome.

var canvas = document.createElement('canvas');
var maxCharsPerLine = 74;

canvas.width = $0.width;
canvas.height = $0.height;

var context = canvas.getContext('2d');
context.drawImage($0, 0, 0);

var dataURL = canvas.toDataURL('image/jpeg', 0.8);
var lines = [];

while (dataURL.length > maxCharsPerLine) {
  lines.push(dataURL.slice(0, maxCharsPerLine));
  dataURL = dataURL.slice(maxCharsPerLine);
}

if (dataURL.length > 0) {
  lines.push(dataURL);
}

copy('module.exports = [\n\t\'' + lines.join('\',\n\t\'') + '\'\n].join(\'\');');
console.log('testImage variable string copied to the clipboard');