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