fox-send/frontend/src/fileSender.js

119 lines
3.2 KiB
JavaScript

import EventEmitter from 'events';
import { arrayToHex } from './utils';
export default 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();
}
};
xhr.send(JSON.stringify({ delete_token: token }));
});
}
cancel() {
this.uploadXHR.abort();
}
upload() {
const self = this;
self.emit('loading');
return Promise.all([
window.crypto.subtle.generateKey(
{
name: 'AES-GCM',
length: 128
},
true,
['encrypt', 'decrypt']
),
new Promise((resolve, reject) => {
const reader = new FileReader();
reader.readAsArrayBuffer(this.file);
reader.onload = function(event) {
const plaintext = new Uint8Array(this.result);
resolve(plaintext);
};
reader.onerror = function(err) {
reject(err);
};
})
])
.then(([secretKey, plaintext]) => {
self.emit('encrypting');
return Promise.all([
window.crypto.subtle.encrypt(
{
name: 'AES-GCM',
iv: this.iv,
tagLength: 128
},
secretKey,
plaintext
),
window.crypto.subtle.exportKey('jwk', secretKey)
]);
})
.then(([encrypted, keydata]) => {
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) {
if (xhr.status === 200) {
const responseObj = JSON.parse(xhr.responseText);
return resolve({
url: responseObj.url,
fileId: responseObj.id,
secretKey: keydata.k,
deleteToken: responseObj.delete
});
}
reject(xhr.status);
}
};
xhr.open('post', '/upload', true);
xhr.setRequestHeader(
'X-File-Metadata',
JSON.stringify({
id: fileId,
filename: encodeURIComponent(file.name)
})
);
xhr.send(fd);
});
});
}
}