fox-send/public/download.js

128 lines
3.8 KiB
JavaScript

function download() {
var xhr = new XMLHttpRequest();
xhr.open("get", "/assets" + location.pathname.slice(0, -1), true);
xhr.responseType = "blob";
var li = document.createElement("li");
var progress = document.createElement("p");
li.appendChild(progress);
document.getElementById("downloaded_files").appendChild(li);
xhr.addEventListener("progress", returnBindedLI(li, progress));
xhr.onload = function(e) {
// maybe send a separate request before this one to get the filename?
// maybe render the html itself with the filename, since it's generated server side
// after a get request with the unique id
var name = document.createElement("p");
name.innerHTML = xhr.getResponseHeader("Content-Disposition").match(/filename="(.+)"/)[1];
li.insertBefore(name, li.firstChild);
if (this.status == 200) {
let self = this;
var blob = new Blob([this.response]);
var arrayBuffer;
var fileReader = new FileReader();
fileReader.onload = function() {
arrayBuffer = this.result;
var array = new Uint8Array(arrayBuffer);
salt = strToIv(location.pathname.slice(10, -1));
window.crypto.subtle.importKey(
"jwk",
{
kty: "oct",
k: location.hash.slice(1),
alg: "A128CBC",
ext: true,
},
{
name: "AES-CBC",
},
true,
["encrypt", "decrypt"])
.then(function(key){
window.crypto.subtle.decrypt(
{
name: "AES-CBC",
iv: salt,
},
key,
array)
.then(function(decrypted){
var dataView = new DataView(decrypted);
var blob = new Blob([dataView]);
var downloadUrl = URL.createObjectURL(blob);
var a = document.createElement("a");
a.href = downloadUrl;
a.download = xhr.getResponseHeader("Content-Disposition").match(/filename="(.+)"/)[1];
document.body.appendChild(a);
a.click();
})
.catch(function(err){
alert("This link is either invalid or has expired, or the uploader has deleted the file.");
console.error(err);
});
})
.catch(function(err){
console.error(err);
});
};
fileReader.readAsArrayBuffer(blob);
} else {
alert("This link is either invalid or has expired, or the uploader has deleted the file.")
}
};
xhr.send();
}
function ivToStr(iv) {
let hexStr = "";
for (var i in iv) {
if (iv[i] < 16) {
hexStr += "0" + iv[i].toString(16);
} else {
hexStr += iv[i].toString(16);
}
}
window.hexStr = hexStr;
return hexStr;
}
function strToIv(str) {
var iv = new Uint8Array(16);
for (var i = 0; i < str.length; i += 2) {
iv[i/2] = parseInt((str.charAt(i) + str.charAt(i + 1)), 16);
}
return iv;
}
function returnBindedLI(li, progress) {
return function updateProgress(e) {
if (e.lengthComputable) {
var percentComplete = Math.floor((e.loaded / e.total) * 100);
progress.innerHTML = "Progress: " + percentComplete + "%";
}
if (percentComplete === 100) {
var finished = document.createElement("p");
finished.innerHTML = "Your download has finished.";
li.appendChild(finished);
var close = document.createElement("button");
close.innerHTML = "Ok";
close.addEventListener("click", function() {
document.getElementById("downloaded_files").removeChild(li);
});
li.appendChild(close);
}
}
}