add jsaccess - download and decrypt files in the browser

1 files changed, 71 insertions, 0 deletions

diff --git a/jsaccess/jsa/jsa.js b/jsaccess/jsa/jsa.js
new file mode 100644
index 0000000..67b55b9
--- /dev/null
+++ b/jsaccess/jsa/jsa.js
@@ -0,0 +1,71 @@
+/* jsaccess - download and decrypt files in the browser
+ * 2013, Laurent Ghigonis <laurent@gouloum.fr> */
+
+/* Reference code */
+//console.log(JSON.stringify(xhr));
+
+/* Called on "body" load */
+function jsainit() {
+	/* XXX get content of jsa/files/ directory to present
+	   a list to the user */
+}
+
+/* Called on "Download" click */
+function jsadl() {
+	document.getElementById('status').innerHTML = "";
+	var pass = document.getElementById('password').value;
+	var file = $('input[name=files]:checked').val();
+	
+	obj = _dl(file, pass);
+}
+
+function _dl(file, pass) {
+	window.URL = window.URL || window.webkitURL;
+	_status("Downloading \""+file+"\" ...");
+
+	dlreq = $.ajax({
+		url: 'files/' + file,
+		beforeSend: function ( xhr ) {
+			xhr.overrideMimeType("application/base64");
+		}
+	}).done(function ( data ) {
+		_status("Download complete, decrypting ...");
+		_decrypt(data, pass, file);
+	});
+}
+
+function hex2a(hex) {
+    var str = '';
+    for (var i = 0; i < hex.length; i += 2)
+        str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
+    return str;
+}
+
+function _decrypt(obj, pass, name) {
+	try {
+		var decrypted = GibberishAES.dec(obj, pass);
+	} catch(err) {
+		_status(err.toString());
+	}
+	out = $.base64.decode(decrypted.toString());
+	_status("Decrypted successfuly, saving ...");
+	_save(out, name);
+}
+
+function _save(obj, name) {
+	var ab = new ArrayBuffer(obj.length);
+	var ia = new Uint8Array(ab);
+	for (var i = 0; i < obj.length; i++) {
+		ia[i] = obj.charCodeAt(i);
+	}
+	var blob = new Blob([ia], {type:"application/octet-binary"});
+	saveAs(blob, name);
+	_status("File \""+name+"\" saved.");
+	_status("Have a good day.");
+}
+
+function _status(txt) {
+	var div = document.getElementById('status');
+	div.innerHTML = div.innerHTML + '<br/>' + txt;
+}
+