Authorization request (add to roster) using strophe.js

Question

I use strophe.js library to send and receive XMPP messages in browser. It works fine, but only for users I already have in my contact list - roster.

I need to add someone (whose address I know) to my roster. How can I achieve this using strophe.js? This is important for me since gmail refuses sending messages to people I don't have in my roster. I'd like to get subscription: both, to be able to receive and send messages.

Hong

Answer 1

Send <presence to="[email protected]" type="subscribe"/>:

conn.send($pres({ to: "[email protected]", type: "subscribe" }));

When your friend accepts, they should send a subscribe to you also, which you can handle by setting a Strophe handler for incoming presence with type "subscribe":

function on_subscription_request(stanza)
{
    if(stanza.getAttribute("type") == "subscribe" && is_friend(stanza.getAttribute("from")))
    {
        // Send a 'subscribed' notification back to accept the incoming
        // subscription request
        conn.send($pres({ to: "[email protected]", type: "subscribed" }));
    }
    return true;
}
conn.addHandler(on_subscription_request, null, "presence", "subscribe");

Warfold

@Warfold and whit is_friend method, can you update code with it? – Aylesbury

@Aylesbury It depends on your application. It receives a JID and should true if the user wants to accept their request, or false if they do not. – Warfold

@MattJ, I understand what it does. But do you check it against roster? My question was more like how is_friend(jid) function looks like. – Aylesbury