kaiwa/clientapp/helpers/fetchAvatar.js

/*global app*/
"use strict";
var crypto = require('crypto');


function fallback(jid) {
    var gID = crypto.createHash('md5').update(jid).digest('hex');
    return {
        uri: 'https://gravatar.com/avatar/' + gID + '?s=80&d=mm'
    };
}


module.exports = function (jid, id, type, cb) {
    if (!id) {
        return cb(fallback(jid));
    }

    app.storage.avatars.get(id, function (err, avatar) {
        if (!err) {
            return cb(avatar);
        }

        if (!type) {
            return cb(fallback(jid));
        }

        app.whenConnected(function () {
            app.api.getAvatar(jid, id, function (err, resp) {
                if (err) {
                    return cb(fallback(jid));
                }

                resp = resp.toJSON();
                var data = resp.pubsub.retrieve.item.avatarData;
                var uri = 'data:' + type + ';base64,' + data;

                avatar = {
                    id: id,
                    type: type,
                    uri: uri
                };

                app.storage.avatars.add(avatar);
                return cb(avatar);
            });
        });
    });
};