const EventEmitter = require('events'); const { arrayToHex } = require('./utils'); const Raven = window.Raven; class FileSender extends EventEmitter { constructor(file) { super(); this.file = file; this.iv = window.crypto.getRandomValues(new Uint8Array(12)); this.uploadXHR = new XMLHttpRequest(); } static delete(fileId, token) { return new Promise((resolve, reject) => { if (!fileId || !token) { return reject(); } const xhr = new XMLHttpRequest(); xhr.open('post', '/delete/' + fileId, true); xhr.setRequestHeader('Content-Type', 'application/json'); xhr.onreadystatechange = () => { if (xhr.readyState === XMLHttpRequest.DONE) { resolve(); } if (xhr.status === 200) { console.log('The file was successfully deleted.'); } else { console.log('The file has expired, or has already been deleted.'); } }; xhr.send(JSON.stringify({ delete_token: token })); }); } cancel() { this.uploadXHR.abort(); } upload() { const self = this; self.emit('loading', true); return Promise.all([ window.crypto.subtle .generateKey( { name: 'AES-GCM', length: 128 }, true, ['encrypt', 'decrypt'] ) .catch(err => console.log('There was an error generating a crypto key') ), new Promise((resolve, reject) => { const reader = new FileReader(); reader.readAsArrayBuffer(this.file); reader.onload = function(event) { self.emit('loading', false); self.emit('hashing', true); const plaintext = new Uint8Array(this.result); window.crypto.subtle.digest('SHA-256', plaintext).then(hash => { self.emit('hashing', false); self.emit('encrypting', true); resolve({ plaintext: plaintext, hash: new Uint8Array(hash) }); }); }; reader.onerror = function(err) { reject(err); }; }) ]) .then(([secretKey, file]) => { return Promise.all([ window.crypto.subtle .encrypt( { name: 'AES-GCM', iv: this.iv, additionalData: file.hash, tagLength: 128 }, secretKey, file.plaintext ) .then(encrypted => { self.emit('encrypting', false); return new Promise((resolve, reject) => { resolve(encrypted); }); }), window.crypto.subtle.exportKey('jwk', secretKey), new Promise((resolve, reject) => { resolve(file.hash); }) ]); }) .then(([encrypted, keydata, hash]) => { return new Promise((resolve, reject) => { const file = this.file; const fileId = arrayToHex(this.iv); const dataView = new DataView(encrypted); const blob = new Blob([dataView], { type: file.type }); const fd = new FormData(); fd.append('data', blob, file.name); const xhr = self.uploadXHR; xhr.upload.addEventListener('progress', e => { if (e.lengthComputable) { self.emit('progress', [e.loaded, e.total]); } }); xhr.onreadystatechange = () => { if (xhr.readyState === XMLHttpRequest.DONE) { // uuid field and url field const responseObj = JSON.parse(xhr.responseText); resolve({ url: responseObj.url, fileId: responseObj.id, secretKey: keydata.k, deleteToken: responseObj.delete }); } }; xhr.open('post', '/upload', true); xhr.setRequestHeader( 'X-File-Metadata', JSON.stringify({ aad: arrayToHex(hash), id: fileId, filename: encodeURIComponent(file.name) }) ); xhr.send(fd); }); }) .catch(err => { Raven.captureException(err); return Promise.reject(err); }); } } module.exports = FileSender;