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) => { const xhr = new XMLHttpRequest(); xhr.onprogress = event => { if (event.lengthComputable) { const percentComplete = Math.floor( event.loaded / event.total * 100 ); this.emit('progress', percentComplete); } }; xhr.onload = function(event) { if (xhr.status === 404) { reject( new Error('The file has expired, or has already been deleted.') ); return; } const blob = new Blob([this.response]); const fileReader = new FileReader(); fileReader.onload = function() { resolve({ data: this.result, fname: xhr .getResponseHeader('Content-Disposition') .match(/=(.+)/)[1] }); }; fileReader.readAsArrayBuffer(blob); }; 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'] ) ]).then(([fdata, key]) => { const salt = this.salt; return Promise.all([ window.crypto.subtle.decrypt( { name: 'AES-CBC', iv: salt }, key, fdata.data ), new Promise((resolve, reject) => { resolve(fdata.fname); }) ]); }); } } module.exports = FileReceiver;