fox-send/public/download.js

136 lines
3.8 KiB
JavaScript

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