113 lines
3.1 KiB
JavaScript
113 lines
3.1 KiB
JavaScript
const EventEmitter = require('events');
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const { ivToStr } = require('./utils');
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const Raven = window.Raven;
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class FileSender extends EventEmitter {
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constructor(file) {
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super();
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this.file = file;
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this.iv = window.crypto.getRandomValues(new Uint8Array(16));
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}
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static delete(fileId, token) {
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return new Promise((resolve, reject) => {
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if (!fileId || !token) {
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return reject();
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}
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const xhr = new XMLHttpRequest();
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xhr.open('post', '/delete/' + fileId, true);
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xhr.setRequestHeader('Content-Type', 'application/json');
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xhr.onreadystatechange = () => {
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if (xhr.readyState === XMLHttpRequest.DONE) {
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resolve();
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}
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if (xhr.status === 200) {
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console.log('The file was successfully deleted.');
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} else {
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console.log('The file has expired, or has already been deleted.');
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}
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};
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xhr.send(JSON.stringify({ delete_token: token }));
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});
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}
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upload() {
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return Promise.all([
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window.crypto.subtle.generateKey(
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{
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name: 'AES-CBC',
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length: 128
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},
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true,
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['encrypt', 'decrypt']
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),
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new Promise((resolve, reject) => {
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const reader = new FileReader();
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reader.readAsArrayBuffer(this.file);
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reader.onload = function(event) {
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resolve(new Uint8Array(this.result));
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};
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})
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])
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.then(([secretKey, plaintext]) => {
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return Promise.all([
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window.crypto.subtle.encrypt(
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{
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name: 'AES-CBC',
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iv: this.iv
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},
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secretKey,
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plaintext
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),
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window.crypto.subtle.exportKey('jwk', secretKey)
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]);
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})
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.then(([encrypted, keydata]) => {
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return new Promise((resolve, reject) => {
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const file = this.file;
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const fileId = ivToStr(this.iv);
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const dataView = new DataView(encrypted);
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const blob = new Blob([dataView], { type: file.type });
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const fd = new FormData();
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fd.append('fname', file.name);
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fd.append('data', blob, file.name);
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const xhr = new XMLHttpRequest();
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xhr.upload.addEventListener('progress', e => {
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if (e.lengthComputable) {
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const percentComplete = Math.floor(e.loaded / e.total * 100);
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this.emit('progress', percentComplete);
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}
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});
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xhr.onreadystatechange = () => {
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if (xhr.readyState === XMLHttpRequest.DONE) {
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// uuid field and url field
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const responseObj = JSON.parse(xhr.responseText);
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resolve({
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url: responseObj.url,
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fileId: fileId,
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secretKey: keydata.k,
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deleteToken: responseObj.uuid
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});
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}
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};
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xhr.open('post', '/upload/' + fileId, true);
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xhr.send(fd);
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});
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})
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.catch(err => {
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Raven.captureException(err);
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return Promise.reject(err);
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});
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}
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}
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module.exports = FileSender;
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