Zyndoras

function rotate(srcBase64, degrees, callback) {
  const canvas = document.createElement('canvas');
  const ctx    = canvas.getContext('2d');
  const image  = new Image();

  image.onload = function () {
    canvas.width  = degrees % 180 === 0 ? image.width : image.height;
    canvas.height = degrees % 180 === 0 ? image.height : image.width;

    ctx.translate(canvas.width / 2, canvas.height / 2);