136 lines
3.8 KiB
JavaScript
136 lines
3.8 KiB
JavaScript
function download() {
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var xhr = new XMLHttpRequest();
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xhr.open('get', '/assets' + location.pathname.slice(0, -1), true);
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xhr.responseType = 'blob';
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var li = document.createElement('li');
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var progress = document.createElement('p');
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li.appendChild(progress);
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document.getElementById('downloaded_files').appendChild(li);
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xhr.addEventListener('progress', returnBindedLI(li, progress));
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xhr.onload = function(e) {
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// maybe send a separate request before this one to get the filename?
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// maybe render the html itself with the filename, since it's generated server side
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// after a get request with the unique id
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var name = document.createElement('p');
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name.innerHTML = xhr
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.getResponseHeader('Content-Disposition')
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.match(/filename="(.+)"/)[1];
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li.insertBefore(name, li.firstChild);
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if (this.status == 200) {
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let self = this;
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var blob = new Blob([this.response]);
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var arrayBuffer;
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var fileReader = new FileReader();
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fileReader.onload = function() {
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arrayBuffer = this.result;
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var array = new Uint8Array(arrayBuffer);
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salt = strToIv(location.pathname.slice(10, -1));
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window.crypto.subtle
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.importKey(
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'jwk',
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{
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kty: 'oct',
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k: location.hash.slice(1),
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alg: 'A128CBC',
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ext: true
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},
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{
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name: 'AES-CBC'
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},
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true,
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['encrypt', 'decrypt']
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)
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.then(function(key) {
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window.crypto.subtle
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.decrypt(
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{
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name: 'AES-CBC',
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iv: salt
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},
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key,
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array
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)
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.then(function(decrypted) {
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var dataView = new DataView(decrypted);
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var blob = new Blob([dataView]);
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var downloadUrl = URL.createObjectURL(blob);
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var a = document.createElement('a');
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a.href = downloadUrl;
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a.download = xhr
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.getResponseHeader('Content-Disposition')
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.match(/filename="(.+)"/)[1];
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document.body.appendChild(a);
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a.click();
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})
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.catch(function(err) {
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alert(
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'This link is either invalid or has expired, or the uploader has deleted the file.'
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);
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console.error(err);
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});
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})
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.catch(function(err) {
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console.error(err);
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});
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};
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fileReader.readAsArrayBuffer(blob);
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} else {
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alert(
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'This link is either invalid or has expired, or the uploader has deleted the file.'
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);
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}
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};
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xhr.send();
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}
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function ivToStr(iv) {
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let hexStr = '';
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for (var i in iv) {
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if (iv[i] < 16) {
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hexStr += '0' + iv[i].toString(16);
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} else {
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hexStr += iv[i].toString(16);
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}
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}
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window.hexStr = hexStr;
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return hexStr;
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}
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function strToIv(str) {
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var iv = new Uint8Array(16);
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for (var i = 0; i < str.length; i += 2) {
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iv[i / 2] = parseInt(str.charAt(i) + str.charAt(i + 1), 16);
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}
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return iv;
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}
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function returnBindedLI(li, progress) {
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return function updateProgress(e) {
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if (e.lengthComputable) {
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var percentComplete = Math.floor(e.loaded / e.total * 100);
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progress.innerHTML = 'Progress: ' + percentComplete + '%';
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}
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if (percentComplete === 100) {
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var finished = document.createElement('p');
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finished.innerHTML = 'Your download has finished.';
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li.appendChild(finished);
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var close = document.createElement('button');
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close.innerHTML = 'Ok';
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close.addEventListener('click', function() {
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document.getElementById('downloaded_files').removeChild(li);
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});
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li.appendChild(close);
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}
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};
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}
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