434 lines
14 KiB
JavaScript
434 lines
14 KiB
JavaScript
(function(name, definition) {
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if (typeof module !== 'undefined') { module.exports = definition(); }
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else if (typeof define === 'function' && typeof define.amd === 'object') { define(definition); }
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else { this[name] = definition(); }
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}('MediaTag', function() {
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var cache;
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var cypherChunkLength = 131088;
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// Save a blob on the file system
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var saveFile = function (blob, url, fileName) {
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if (window.navigator && window.navigator.msSaveOrOpenBlob) {
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window.navigator.msSaveOrOpenBlob(blob, fileName);
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} else {
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// We want to be able to download the file with a name, so we need an "a" tag with
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// a download attribute
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var a = document.createElement("a");
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a.href = url;
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a.download = fileName;
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// It's not in the DOM, so we can't use a.click();
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var event = new MouseEvent("click");
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a.dispatchEvent(event);
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}
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};
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var fixHTML = function (str) {
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if (!str) { return ''; }
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return str.replace(/[<>&"']/g, function (x) {
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return ({ "<": "<", ">": ">", "&": "&", '"': """, "'": "'" })[x];
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});
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};
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// Default config, can be overriden per media-tag call
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var config = {
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allowed: [
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'image/png',
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'image/jpeg',
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'image/jpg',
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'image/gif',
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'audio/mp3',
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'audio/ogg',
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'audio/wav',
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'audio/webm',
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'video/mp4',
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'video/ogg',
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'video/webm',
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'application/pdf',
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//'application/dash+xml', // FIXME?
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'download'
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],
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pdf: {},
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download: {
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text: "Download"
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},
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Plugins: {
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image: function (metadata, url, content, cfg, cb) {
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var img = document.createElement('img');
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img.setAttribute('src', url);
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img.blob = content;
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cb(void 0, img);
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},
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video: function (metadata, url, content, cfg, cb) {
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var video = document.createElement('video');
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video.setAttribute('src', url);
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video.setAttribute('controls', true);
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cb(void 0, video);
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},
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audio: function (metadata, url, content, cfg, cb) {
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var audio = document.createElement('audio');
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audio.setAttribute('src', url);
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audio.setAttribute('controls', true);
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cb(void 0, audio);
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},
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pdf: function (metadata, url, content, cfg, cb) {
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var iframe = document.createElement('iframe');
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if (cfg.pdf.viewer) { // PDFJS
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var viewerUrl = cfg.pdf.viewer + '?file=' + url;
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iframe.src = viewerUrl + '#' + window.encodeURIComponent(metadata.name);
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return void cb (void 0, iframe);
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}
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iframe.src = url + '#' + window.encodeURIComponent(metadata.name);
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return void cb (void 0, iframe);
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},
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download: function (metadata, url, content, cfg, cb) {
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var btn = document.createElement('button');
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btn.setAttribute('class', 'btn btn-success');
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btn.innerHTML = cfg.download.text + '<br>' +
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(metadata.name ? '<b>' + fixHTML(metadata.name) + '</b>' : '');
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btn.addEventListener('click', function () {
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saveFile(content, url, metadata.name);
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});
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cb(void 0, btn);
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}
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}
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};
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// Download a blob from href
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var download = function (src, _cb) {
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var cb = function (e, res) {
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_cb(e, res);
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cb = function () {};
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};
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var xhr = new XMLHttpRequest();
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xhr.open('GET', src, true);
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xhr.responseType = 'arraybuffer';
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xhr.onerror = function () { return void cb("XHR_ERROR"); };
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xhr.onload = function () {
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// Error?
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if (/^4/.test('' + this.status)) { return void cb("XHR_ERROR " + this.status); }
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var arrayBuffer = xhr.response;
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if (arrayBuffer) { cb(null, new Uint8Array(arrayBuffer)); }
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};
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xhr.send(null);
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};
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// Decryption tools
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var Decrypt = {
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// Create a nonce
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createNonce: function () {
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var n = new Uint8Array(24);
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for (var i = 0; i < 24; i++) { n[i] = 0; }
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return n;
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},
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// Increment a nonce
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increment: function (N) {
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var l = N.length;
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while (l-- > 1) {
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/* .jshint probably suspects this is unsafe because we lack types
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but as long as this is only used on nonces, it should be safe */
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if (N[l] !== 255) { return void N[l]++; } // jshint ignore:line
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// you don't need to worry about this running out.
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// you'd need a REAAAALLY big file
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if (l === 0) { throw new Error('E_NONCE_TOO_LARGE'); }
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N[l] = 0;
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}
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},
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decodePrefix: function (A) {
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return (A[0] << 8) | A[1];
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},
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joinChunks: function (chunks) {
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return new Blob(chunks);
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},
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// Convert a Uint8Array into Array.
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slice: function (u8) {
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return Array.prototype.slice.call(u8);
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},
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// Gets the key from the key string.
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getKeyFromStr: function (str) {
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return window.nacl.util.decodeBase64(str);
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}
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};
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// Decrypts a Uint8Array with the given key.
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var decrypt = function (u8, strKey, done, progressCb) {
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var Nacl = window.nacl;
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var progress = function (offset) {
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progressCb((offset / u8.length) * 100);
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};
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var key = Decrypt.getKeyFromStr(strKey);
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var nonce = Decrypt.createNonce();
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var i = 0;
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var prefix = u8.subarray(0, 2);
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var metadataLength = Decrypt.decodePrefix(prefix);
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var res = { metadata: undefined };
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// Get metadata
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var metaBox = new Uint8Array(u8.subarray(2, 2 + metadataLength));
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var metaChunk = Nacl.secretbox.open(metaBox, nonce, key);
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Decrypt.increment(nonce);
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try { res.metadata = JSON.parse(Nacl.util.encodeUTF8(metaChunk)); }
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catch (e) { return void done('E_METADATA_DECRYPTION'); }
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if (!res.metadata) { return void done('NO_METADATA'); }
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var takeChunk = function (cb) {
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setTimeout(function () {
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var start = i * cypherChunkLength + 2 + metadataLength;
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var end = start + cypherChunkLength;
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i++;
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// Get the chunk
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var box = new Uint8Array(u8.subarray(start, end));
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// Decrypt the chunk
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var plaintext = Nacl.secretbox.open(box, nonce, key);
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Decrypt.increment(nonce);
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if (!plaintext) { return void cb('DECRYPTION_FAILURE'); }
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progress(Math.min(end, u8.length));
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cb(void 0, plaintext);
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});
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};
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var chunks = [];
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// decrypt file contents
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var again = function () {
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takeChunk(function (e, plaintext) {
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if (e) { return setTimeout(function () { done(e); }); }
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if (plaintext) {
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if ((i * cypherChunkLength + 2 + metadataLength) < u8.length) { // not done
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chunks.push(plaintext);
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return again();
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}
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chunks.push(plaintext);
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res.content = Decrypt.joinChunks(chunks);
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return void done(void 0, res);
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}
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done('UNEXPECTED_ENDING');
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});
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};
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again();
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};
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// Get type
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var getType = function (mediaObject, metadata, cfg) {
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var mime = metadata.type;
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var s = metadata.type.split('/');
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var type = s[0];
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var extension = s[1];
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mediaObject.name = metadata.name;
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if (mime && cfg.allowed.indexOf(mime) !== -1) {
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mediaObject.type = type;
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mediaObject.extension = extension;
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mediaObject.mime = mime;
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return type;
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} else if (cfg.allowed.indexOf('download') !== -1) {
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mediaObject.type = type;
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mediaObject.extension = extension;
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mediaObject.mime = mime;
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return 'download';
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} else {
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return;
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}
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};
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// Copy attributes
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var copyAttributes = function (origin, dest) {
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Object.keys(origin.attributes).forEach(function (i) {
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if (!/^data-attr/.test(origin.attributes[i].name)) { return; }
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var name = origin.attributes[i].name.slice(10);
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var value = origin.attributes[i].value;
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dest.setAttribute(name, value);
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});
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};
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// Process
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var process = function (mediaObject, decrypted, cfg, cb) {
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var metadata = decrypted.metadata;
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var blob = decrypted.content;
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var mediaType = getType(mediaObject, metadata, cfg);
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if (mediaType === 'application') {
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mediaType = mediaObject.extension;
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}
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if (!mediaType || !cfg.Plugins[mediaType]) {
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return void cb('NO_PLUGIN_FOUND');
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}
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// Get blob URL
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var url = decrypted.url;
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if (!url && window.URL) {
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url = decrypted.url = window.URL.createObjectURL(new Blob([blob], {
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type: metadata.type
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}));
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}
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cfg.Plugins[mediaType](metadata, url, blob, cfg, function (err, el) {
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if (err || !el) { return void cb(err || 'ERR_MEDIATAG_DISPLAY'); }
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copyAttributes(mediaObject.tag, el);
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mediaObject.tag.innerHTML = '';
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mediaObject.tag.appendChild(el);
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cb();
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});
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};
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var addMissingConfig = function (base, target) {
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Object.keys(target).forEach(function (k) {
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if (!target[k]) { return; }
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// Target is an object, fix it recursively
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if (typeof target[k] === "object" && !Array.isArray(target[k])) {
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// Sub-object
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if (base[k] && (typeof base[k] !== "object" || Array.isArray(base[k]))) { return; }
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else if (base[k]) { addMissingConfig(base[k], target[k]); }
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else {
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base[k] = {};
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addMissingConfig(base[k], target[k]);
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}
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}
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// Target is array or immutable, copy the value if it's missing
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if (!base[k]) {
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base[k] = Array.isArray(target[k]) ? JSON.parse(JSON.stringify(target[k]))
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: target[k];
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}
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});
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};
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// Initialize a media-tag
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var init = function (el, cfg) {
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cfg = cfg || {};
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addMissingConfig(cfg, config);
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// Handle jQuery elements
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if (typeof(el) === "object" && el.jQuery) { el = el[0]; }
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// Abort smoothly if the element is not a media-tag
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if (!el || el.nodeName !== "MEDIA-TAG") {
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console.error("Not a media-tag!");
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return {
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on: function () { return this; }
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};
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}
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var handlers = cfg.handlers || {
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'progress': [],
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'complete': [],
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'error': []
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};
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var mediaObject = el._mediaObject = {
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handlers: handlers,
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tag: el
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};
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var emit = function (ev, data) {
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// Check if the event name is valid
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if (Object.keys(handlers).indexOf(ev) === -1) {
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return void console.error("Invalid mediatag event");
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}
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// Call the handlers
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handlers[ev].forEach(function (h) {
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// Make sure a bad handler won't break the media-tag script
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try {
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h(data);
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} catch (err) {
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console.error(err);
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}
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});
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};
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mediaObject.on = function (ev, handler) {
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// Check if the event name is valid
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if (Object.keys(handlers).indexOf(ev) === -1) {
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console.error("Invalid mediatag event");
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return mediaObject;
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}
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// Check if the handler is valid
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if (typeof (handler) !== "function") {
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console.error("Handler is not a function!");
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return mediaObject;
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}
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// Add the handler
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handlers[ev].push(handler);
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return mediaObject;
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};
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var src = el.getAttribute('src');
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var strKey = el.getAttribute('data-crypto-key');
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if (/^cryptpad:/.test(strKey)) {
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strKey = strKey.slice(9);
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}
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var uid = [src, strKey].join('');
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// End media-tag rendering: display the tag and emit the event
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var end = function (decrypted) {
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process(mediaObject, decrypted, cfg, function (err) {
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if (err) { return void emit('error', err); }
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emit('complete', decrypted);
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});
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};
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// If we have the blob in our cache, don't download & decrypt it again, just display
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if (cache[uid]) {
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end(cache[uid]);
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return mediaObject;
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}
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// Download the encrypted blob
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download(src, function (err, u8Encrypted) {
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if (err) {
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return void emit('error', err);
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}
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// Decrypt the blob
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decrypt(u8Encrypted, strKey, function (errDecryption, u8Decrypted) {
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if (errDecryption) {
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return void emit('error', errDecryption);
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}
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// Cache and display the decrypted blob
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cache[uid] = u8Decrypted;
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end(u8Decrypted);
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}, function (progress) {
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emit('progress', {
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progress: progress
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});
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});
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});
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return mediaObject;
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};
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// Add the cache as a property of MediaTag
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cache = init.__Cryptpad_Cache = {};
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init.setDefaultConfig = function (key, value) {
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config[key] = value;
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};
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return init;
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}));
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