Develop Reference

Can not encrypt a signature using Topaz SigWeb API

I am trying to integrate SigWeb API into my application. I want to use the digital signature in all modern browsers. Now it works only in IE, using ActiveX object. The problem is that I can not use the encryption key.
Let me explain:
Old version js code looks like:
SigPlus1.AutoKeyStart();
SigPlus1.AutoKeyData = "Some Key Data";
SigPlus1.AutoKeyFinish();
SigPlus1.EncryptionMode = 2;
SigPlus1.SigCompressionMode = 1;
var strSignature = SigPlus1.SigString;
New version (using SigWebTablet.js):
AutoKeyStart();
SetAutoKeyData("Some Key Data");
AutoKeyFinish();
SetEncryptionMode(2);
SetSigCompressionMode(1);
var strSignature = GetSigString();
The value of strSignature is passed to the server and converted to .jpg file. On the server side (java) I am using following code:
ClassLoader firma = (com.topaz.sigplus.SigPlus.class).getClassLoader();
sigObj = (SigPlus)Beans.instantiate(firma, "com.topaz.sigplus.SigPlus");
sigObj.autoKeyStart();
sigObj.setAutoKeyData("Some Key Data"); // the same data in front-end
sigObj.autoKeyFinish();
sigObj.setEncryptionMode (2);
sigObj.setSigCompressionMode(1);
sigObj.setSigString(strSignature);
The problem in setSigString method - it doesn't set the new value (with the old code SigPlus1.SigString works), but if I disable setAutoKeyData - it works fine.
The tablet model: T-LBK766SE-BHSB-R

I have found a solution which works for me. Before signature capture it needs to reset the encryption mode, i.e. to call SetEncryptionMode(0)
UPD (05/03/2017). Guys from dev support recommended me to use AutoKeyAddData function instead AutoKeyStart and AutoKeyFinish functions. I have tested and it works for me. I think this better solution of this issue.
http://www.sigplusweb.com/sigwebtablet_autokeydemo.htm

What is wrong with my javascript for a browser I would like to create?

I know you people will think I am insane, and thus an idiot, but I really have a serious question, well at least to me. What is wrong with my javascript for a browser I would like to create?It will not open the URL in the iframe. I am creating an html source file with some javascript to split a "get" url,and echo the resulting variable into an iFrame. I wanna use Webkit as the rendering engine, so I'm using Google Chrome to create an application shortcut. Yes, I know it will require google chrome, but this is just a test.
function goTo(){
var urlb = window.location.href;
var urla = urlb.split('localhost/browser.html?url=');
var urlc = urla[1];
var urld = urlc.replace("+"," ");
var urle = urld.replace("%3A ",":");
var urlg = urle.replace("%2F","/");
var url = urlg;
document.getElementByID('url').innerHTML="<iframe src=' . url . "'width='100%'
height='90%'></iframe> Opened:" . url ."</div>";
}
This is the javscript function to open the url. I am pretty sure you would think that the html is just a simple input form and the blank Iframe, which it is.
Please help me if you can.

When you are trying to get the URL, you want to use decodeURIComponent(). Don't make up your own function to unescape the data. Also, get the query string parameters properly. See this StackOverflow post: https://stackoverflow.com/a/901144/362536
Now that you have the proper URL, don't simply inject it into your HTML. You're opening yourself up to security troubles, and a broken browser when you run into characters you don't expect. Create the iframe, then set its attributes programmatically. https://stackoverflow.com/a/710347/362536
Finally, fix your syntax errors.

Do we need a web server (like Apache) to access a .json file?

I was trying to read an info.json file, using the jQuery API. Please find the code below, which is part of test.html.
$.getJSON('info.json', function(data) {
var items = [];
$.each(data, function(key, val) {
items.push('<li id="' + key + '">' + val + '</li>');
});
The test.html file resides on my local machine and when I try to open it in the browser, the Ajax call is not getting triggered and the info.json file is not read.
Is it not working because I don't have a web server? Or am I doing anything wrong in the code? (I don't see any errors in the Firebug console though).
Thanks in advance.

You will always have to host your site from where you are making AJAX call. Otherwise it will throw this exception.
origin null is not allowed by access-control-allow-origin
Host your page on localhost server and I guess everything will work nicely.

While technically you don't need a web server for this, some of the libraries you use to abstract network access may not work with local files and some browsers don't let local files do a lot, so something like a little test web server for static files would be very useful for your development and testing.

Install a small webserver like http://jetty.codehaus.org/jetty/
easy to install, and small download ;)

By putting your JSON string into a text file and loading it in a iframe, you can extrapolate the data. (Most browsers can load .txt files in iframes.)
var frame = document.createElement("IFRAME"); //Create new iframe
var body = document.body;
frame.onload = function() { //Extrapolate JSON once loaded
data = JSON.parse(frame.contentDocument.documentElement.innerText); //Loads as a global.
body.removeChild(frame); //Removes the frame once no longer necessary.
}
frame.style.display = "none"; //Because the frame will have to be appended to the body.
body.appendChild(frame);
frame.src = "your JSON.txt"; //Select source after the onload function is set.

javascript or jquery fileSize

I was looking all over the web how i can get the file size on the client side
so i found a few examples
the first example was
$(this)[0].files[0].fileSize
but unfortunately it does not working in ie
so i found this example
function getSize(){
var myFSO = new ActiveXObject("Scripting.FileSystemObject");
var filepath = document.upload.file.value;
var thefile = myFSO.getFile(filepath);
var size = thefile.size;
alert(size + " bytes");
}
which is suppose to work in ie but i heard it has security problems and i don't know if it work in all browsers..
so , i need to know what i can use in javascript client side to get the file size..
e.g : file from input type file
thank you for helping.

JavaScript cannot access any information about local files. This is done deliberately for security reasons.
ActiveXObject("Scripting.FileSystemObject"); is an IE-only construct and will not work across browsers.

Mozilla (Firefox, Thunderbird) Extension: How to get extension id (from install.rdf)?

If you are developing an extension for one of the mozilla applications (e.g. Firefox, Thunderbird, etc.) you define a extension id in the install.rdf.
If for some reason you need to know the extension id e.g. to retrieve the extension dir in local file system (1) or if you want to send it to a webservice (useage statistic) etc. it would be nice to get it from the install.rdf in favour to have it hardcoded in your javascript code.
But how to access the extension id from within my extension?
1) example code:
var extId = "myspecialthunderbirdextid#mydomain.com";
var filename = "install.rdf";
var file = extManager.getInstallLocation(extId).getItemFile(extId, filename);
var fullPathToFile = file.path;

I'm fairly sure the 'hard-coded ID' should never change throughout the lifetime of an extension. That's the entire purpose of the ID: it's unique to that extension, permanently. Just store it as a constant and use that constant in your libraries. There's nothing wrong with that.
What IS bad practice is using the install.rdf, which exists for the sole purpose of... well, installing. Once the extension is developed, the install.rdf file's state is irrelevant and could well be inconsistent.
"An Install Manifest is the file an Add-on Manager-enabled XUL application uses to determine information about an add-on as it is being installed" [1]
To give it an analogy, it's like accessing the memory of a deleted object from an overflow. That object still exists in memory but it's not logically longer relevant and using its data is a really, really bad idea.
[1] https://developer.mozilla.org/en/install_manifests

Like lwburk, I don't think its available through Mozilla's API's, but I have an idea which works, but it seems like a complex hack. The basic steps are:
Set up a custom resource url to point to your extension's base directory
Read the file and parse it into XML
Pull the id out using XPath
Add the following line to your chrome.manifest file
resource packagename-base-dir chrome/../
Then we can grab and parse the file with the following code:
function myId(){
var req = new XMLHttpRequest();
// synchronous request
req.open('GET', "resource://packagename-base-dir/install.rdf", false);
req.send(null);
if( req.status !== 0){
throw("file not found");
}
var data = req.responseText;
// this is so that we can query xpath with namespaces
var nsResolver = function(prefix){
var ns = {
"rdf" : "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
"em" : "http://www.mozilla.org/2004/em-rdf#"
};
return ns[prefix] || null;
};
var parser = CCIN("#mozilla.org/xmlextras/domparser;1", Ci.nsIDOMParser);
var doc = parser.parseFromString(data, "text/xml");
// you might have to change this xpath expression a bit to fit your setup
var myExtId = doc.evaluate("//em:targetApplication//em:id", doc, nsResolver,
Ci.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE, null);
return myExtId.singleNodeValue.textContent;
}
I chose to use a XMLHttpRequest(as opposed to simply reading from a file) to retrieve the contents since in Firefox 4, extensions aren't necessarily unzipped. However, XMLHttpRequest will still work if the extension remains packed (haven't tested this, but have read about it).
Please note that resource URL's are shared by all installed extensions, so if packagename-base-dir isn't unique, you'll run into problems. You might be able to leverage Programmatically adding aliases to solve this problem.
This question prompted me to join StackOverflow tonight, and I'm looking forward participating more... I'll be seeing you guys around!

As Firefox now just uses Chrome's WebExtension API, you can use #serg's answer at How to get my extension's id from JavaScript?:
You can get it like this (no extra permissions required) in two
different ways:
Using runtime api: var myid = chrome.runtime.id;
Using i18n api: var myid = chrome.i18n.getMessage("##extension_id");

I can't prove a negative, but I've done some research and I don't think this is possible. Evidence:
This question, which shows that
the nsIExtensionManager interface
expects you to retrieve extension
information by ID
The full nsIExtensionManager interface
description, which shows no
method that helps
The interface does allow you to retrieve a full list of installed extensions, so it's possible to retrieve information about your extension using something other than the ID. See this code, for example:
var em = Cc['#mozilla.org/extensions/manager;1']
.getService(Ci.nsIExtensionManager);
const nsIUpdateItem = Ci.nsIUpdateItem;
var extension_type = nsIUpdateItem.TYPE_EXTENSION;
items = em.getItemList(extension_type, {});
items.forEach(function(item, index, array) {
alert(item.name + " / " + item.id + " version: " + item.version);
});
But you'd still be relying on hardcoded properties, of which the ID is the only one guaranteed to be unique.

Take a look on this add-on, maybe its author could help you, or yourself can figure out:
[Extension Manager] Extended is very
simple to use. After installing, just
open the extension manager by going to
Tools and the clicking Extensions. You
will now see next to each extension
the id of that extension.
(Not compatible yet with Firefox 4.0)
https://addons.mozilla.org/firefox/addon/2195