HTTPS redirector thing

gistfile1.txt

Components.utils.import("resource://gre/modules/Services.jsm");

let redirects;

let pref = {
	name: "extensions.something.pref",
	init: function() {
		this.readPref();
		Services.prefs.addObserver(this.name, this, false);
	},
	destroy: function() {
		Services.prefs.removeObserver(this.name, this);
	},
	readPref: function() {
		let pref = [];
		try {
			pref = JSON.parse(Services.prefs.getCharPref(this.name));
		} catch(ex) {
		}
		redirects = pref.map(s => {
			if (s[0] == ".") {
				return new RegExp("(^|\\.)" + s.substring(1).replace(/\./, "\\.") + "$");
			}
			return s;
		});
	},
	observe: function() {
		this.readPref();
	}
};

let observer = {
	observe: function(channel) {
		if (!(channel instanceof Components.interfaces.nsIHttpChannel)) return;

		let uri = channel.URI;
		if (!uri.schemeIs("http")) return;

		if (redirects.some(
			(p) => (typeof p == "string" && uri.host == p) || (p instanceof RegExp && p.test(uri.host))
		)) {
			// Services.console.logStringMessage("redirecting " + uri.spec);
			channel.redirectTo(Services.io.newURI(uri.spec.replace(/^http:/, "https:"), null, null));
		}
	}
};

function install() {
}
function uninstall() {
}
function startup() {
	pref.init();
	Services.obs.addObserver(observer, "http-on-modify-request", false);
}
function shutdown() {
	pref.destroy();
	Services.obs.removeObserver(observer, "http-on-modify-request");
}