function url_block_callback(details)
{
    if (details.requestBody)
    {
	if (details.requestBody.formData)
	{
	    for (var key in details.requestBody.formData)
	    {
		for(var idx in details.requestBody.formData[key])
		{
		    value = details.requestBody.formData[key][idx];
		    if (value.startsWith("@@") ||
			value.startsWith("@_"))
			return {cancel: true};
		}
	    }
	}

	/*
	// Analyse POST parameters
	if (details.method == "POST" && details.requestBody.raw)
	{
	    alert(details.requestBody.raw);
	    var postedString = decodeURIComponent(String.fromCharCode.apply(null,
                                      new Uint8Array(details.requestBody.raw[0].bytes)));
	    if (postedString.indexOf("=@@") != -1 ||
		postedString.indexOf("=@_") != -1)
		return {cancel: true};
	}
*/
    }

    return {cancel: false};
}

browser.runtime.onMessage.addListener(
    function(request) {

	if (request.type == "notification")
	{
	    options = {
		type: "basic",
		title : "gPass",
		message : request.options.message,
		iconUrl:browser.extension.getURL("icons/gpass_icon_64.png")
	    };

	    browser.notifications.create("gPass", options);

	    window.setTimeout(function() {browser.notifications.clear("gPass")}, 2000);
	}
	else if (request.type == "block_url")
	{
	    browser.tabs.getCurrent().then(
	    	function onGot(tab) {
	    	    if (tab)
	    	    {
	    		browser.webRequest.onBeforeRequest.addListener(
	    		    url_block_callback,
	    		    {urls:[request.options.url],
	    		     "types":["main_frame"],
	    		     "tabId":tab.id,
	    		     "windowId":tab.windowId
	    		    },
	    		    ["blocking", "requestBody"]);
	    	    }
	    	    else
	    	    {
			browser.webRequest.onBeforeRequest.addListener(
			    url_block_callback,
			    {urls:[request.options.url], types:["main_frame"]},
			    ["blocking", "requestBody"]);
		    }		    
		});
	}
    });