send/frontend/src/fileReceiver.js

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const EventEmitter = require('events');
const { strToIv } = require('./utils');
class FileReceiver extends EventEmitter {
constructor() {
super();
this.salt = strToIv(location.pathname.slice(10, -1));
}
download() {
return Promise.all([
new Promise((resolve, reject) => {
let xhr = new XMLHttpRequest();
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xhr.onprogress = e => {
if (e.lengthComputable) {
let percentComplete = Math.floor(e.loaded / e.total * 100);
this.emit('progress', percentComplete);
}
};
xhr.onload = function(e) {
if (xhr.status === 404) {
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reject(
new Error('The file has expired, or has already been deleted.')
);
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return;
}
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let blob = new Blob([this.response]);
let fileReader = new FileReader();
fileReader.onload = function() {
resolve({
data: this.result,
fname: xhr
.getResponseHeader('Content-Disposition')
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.match(/=(.+)/)[1]
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});
};
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fileReader.readAsArrayBuffer(blob);
};
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xhr.open('get', '/assets' + location.pathname.slice(0, -1), true);
xhr.responseType = 'blob';
xhr.send();
}),
window.crypto.subtle.importKey(
'jwk',
{
kty: 'oct',
k: location.hash.slice(1),
alg: 'A128CBC',
ext: true
},
{
name: 'AES-CBC'
},
true,
['encrypt', 'decrypt']
)
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]).then(([fdata, key]) => {
let salt = this.salt;
return Promise.all([
window.crypto.subtle.decrypt(
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{
name: 'AES-CBC',
iv: salt
},
key,
fdata.data
),
new Promise((resolve, reject) => {
resolve(fdata.fname);
})
]);
});
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}
}
module.exports = FileReceiver;