drop.chapril.org-firefoxsend/frontend/src/fileSender.js

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