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

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const EventEmitter = require('events');
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const { hexToArray } = require('./utils');
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class FileReceiver extends EventEmitter {
constructor() {
super();
}
download() {
return Promise.all([
new Promise((resolve, reject) => {
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const xhr = new XMLHttpRequest();
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xhr.onprogress = event => {
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if (event.lengthComputable && event.target.status !== 404) {
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this.emit('progress', [event.loaded, event.total]);
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}
};
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xhr.onload = function(event) {
if (xhr.status === 404) {
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reject(
new Error('The file has expired, or has already been deleted.')
);
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return;
}
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const blob = new Blob([this.response]);
const fileReader = new FileReader();
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fileReader.onload = function() {
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const meta = JSON.parse(xhr.getResponseHeader('X-File-Metadata'));
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resolve({
data: this.result,
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aad: meta.aad,
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filename: meta.filename,
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iv: meta.id
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});
};
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fileReader.readAsArrayBuffer(blob);
};
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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),
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alg: 'A128GCM',
ext: true
},
{
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name: 'AES-GCM'
},
true,
['encrypt', 'decrypt']
)
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])
.then(([fdata, key]) => {
this.emit('decrypting', true);
return Promise.all([
window.crypto.subtle
.decrypt(
{
name: 'AES-GCM',
iv: hexToArray(fdata.iv),
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additionalData: hexToArray(fdata.aad),
tagLength: 128
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},
key,
fdata.data
)
.then(decrypted => {
this.emit('decrypting', false);
return Promise.resolve(decrypted);
}),
fdata.filename,
hexToArray(fdata.aad)
]);
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})
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.then(([decrypted, fname, proposedHash]) => {
this.emit('hashing', true);
return window.crypto.subtle
.digest('SHA-256', decrypted)
.then(calculatedHash => {
this.emit('hashing', false);
const integrity =
new Uint8Array(calculatedHash).toString() ===
proposedHash.toString();
if (!integrity) {
this.emit('unsafe', true);
return Promise.reject();
} else {
this.emit('safe', true);
return Promise.all([decrypted, decodeURIComponent(fname)]);
}
});
});
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}
}
module.exports = FileReceiver;