elgglib.js

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var elgg = elgg || {};

elgg.assertTypeOf = function(type, val) {
    if (typeof val !== type) {
        throw new TypeError("Expecting param of " +
                            arguments.caller + "to be a(n) " + type + "." +
                            "  Was actually a(n) " + typeof val + ".");
    }
};

elgg.normalize_url = function(url) {
    url = url || '';
    elgg.assertTypeOf('string', url);

    function validate(url) {
        url = elgg.parse_url(url);
        if (url.scheme) {
            url.scheme = url.scheme.toLowerCase();
        }
        if (url.scheme == 'http' || url.scheme == 'https') {
            if (!url.host) {
                return false;
            }
            /* hostname labels may contain only alphanumeric characters, dots and hypens. */
            if (!(new RegExp("^([a-zA-Z0-9][a-zA-Z0-9\\-\\.]*)$", "i")).test(url.host) || url.host.charAt(-1) == '.') {
                return false;
            }
        }
        /* some schemas allow the host to be empty */
        if (!url.scheme || !url.host && url.scheme != 'mailto' && url.scheme != 'news' && url.scheme != 'file') {
            return false;
        }
        return true;
    };

    // ignore anything with a recognized scheme
    if (url.indexOf('http:') === 0 || url.indexOf('https:') === 0 || url.indexOf('javascript:') === 0 || url.indexOf('mailto:') === 0 ) {
        return url;
    } else if (validate(url)) {
        // all normal URLs including mailto:
        return url;
    } else if ((new RegExp("^(\\#|\\?|//)", "i")).test(url)) {
        // '//example.com' (Shortcut for protocol.)
        // '?query=test', #target
        return url;
    } else if ((new RegExp("^[^\/]*\\.php(\\?.*)?$", "i")).test(url)) {
        // watch those double escapes in JS.
        // 'install.php', 'install.php?step=step'
        if (url.indexOf('/') === 0) {
            url = url.substring(1);
        }
        
        return elgg.config.wwwroot + url;
    } else if ((new RegExp("^[^/\\?\\#]*\\.", "i")).test(url)) {
        // 'example.com', 'example.com/subpage'
        return 'http://' + url;
    } else {
        // 'page/handler', 'mod/plugin/file.php'
        // trim off any leading / because the site URL is stored
        // with a trailing /
        if (url.indexOf('/') === 0) {
            url = url.substring(1);
        }
        
        return elgg.config.wwwroot + url;
    }
};

elgg.deprecated_notice = function(msg, dep_version) {
    if (elgg.is_admin_logged_in()) {
        msg = "Deprecated in Elgg " + dep_version + ": " + msg;
        if (typeof console !== "undefined") {
            console.info(msg);
        }
    }
};

elgg.forward = function(url) {
    var dest = elgg.normalize_url(url);

    if (dest == location.href) {
        location.reload();
    }

    // in case the href set below just changes the hash, we want to reload. There's sadly
    // no way to force a reload and set a different hash at the same time.
    $(window).on('hashchange', function () {
        location.reload();
    });

    location.href = dest;
};

elgg.parse_url = function(url, component, expand) {
    // Adapted from http://blog.stevenlevithan.com/archives/parseuri
    // which was release under the MIT
    // It was modified to fix mailto: and javascript: support.
    expand = expand || false;
    component = component || false;
    
    var re_str =
        // scheme (and user@ testing)
        '^(?:(?![^:@]+:[^:@/]*@)([^:/?#.]+):)?(?://)?'
        // possibly a user[:password]@
        + '((?:(([^:@]*)(?::([^:@]*))?)?@)?'
        // host and port
        + '([^:/?#]*)(?::(\\d*))?)'
        // path
        + '(((/(?:[^?#](?![^?#/]*\\.[^?#/.]+(?:[?#]|$)))*/?)?([^?#/]*))'
        // query string
        + '(?:\\?([^#]*))?'
        // fragment
        + '(?:#(.*))?)';
    var keys = {
        1: "scheme",
        4: "user",
        5: "pass",
        6: "host",
        7: "port",
        9: "path",
        12: "query",
        13: "fragment"
    };
    var results = {};

    if (url.indexOf('mailto:') === 0) {
        results['scheme'] = 'mailto';
        results['path'] = url.replace('mailto:', '');
        return results;
    }

    if (url.indexOf('javascript:') === 0) {
        results['scheme'] = 'javascript';
        results['path'] = url.replace('javascript:', '');
        return results;
    }

    var re = new RegExp(re_str);
    var matches = re.exec(url);

    for (var i in keys) {
        if (matches[i]) {
            results[keys[i]] = matches[i];
        }
    }

    if (expand && typeof(results['query']) != 'undefined') {
        results['query'] = elgg.parse_str(results['query']);
    }

    if (component) {
        if (typeof(results[component]) != 'undefined') {
            return results[component];
        } else {
            return false;
        }
    }
    return results;
};

elgg.parse_str = function(string) {
    var params = {},
        result,
        key,
        value,
        re = /([^&=]+)=?([^&]*)/g,
        re2 = /\[\]$/;

    // assignment intentional
    while (result = re.exec(string)) {
        key = decodeURIComponent(result[1].replace(/\+/g, ' '));
        value = decodeURIComponent(result[2].replace(/\+/g, ' '));

        if (re2.test(key)) {
            key = key.replace(re2, '');
            if (!params[key]) {
                params[key] = [];
            }
            params[key].push(value);
        } else {
            params[key] = value;
        }
    }
    
    return params;
};

elgg.getSelectorFromUrlFragment = function(url) {
    var fragment = url.split('#')[1];

    if (fragment) {
        // this is a .class or a tag.class
        if (fragment.indexOf('.') > -1) {
            return fragment;
        } else {
            // this is an id
            return '#' + fragment;
        }
    }
    return '';
};

elgg.get_logged_in_user_guid = function() {
    return elgg.user ? elgg.user.guid : 0;
};

elgg.is_logged_in = function() {
    return elgg.get_logged_in_user_guid() > 0;
};

elgg.is_admin_logged_in = function() {
    return elgg.user ? elgg.user.admin : false;
};

elgg.get_site_url = function() {
    return elgg.config.wwwroot;
};

elgg.get_simplecache_url = function(view, subview) {
    elgg.assertTypeOf('string', view);
    
    var lastcache, path;

    if (elgg.config.simplecache_enabled) {
        lastcache = elgg.config.lastcache;
    } else {
        lastcache = 0;
    }

    if (!subview) {
        path = '/cache/' + lastcache + '/' + elgg.config.viewtype + '/' + view;
    } else {
        elgg.assertTypeOf('string', subview);
        
        if ((view === 'js' || view === 'css') && 0 === subview.indexOf(view + '/')) {
            subview = subview.substr(view.length + 1);
        }
        path = '/cache/' + lastcache + '/' + elgg.config.viewtype + '/' + view + '/' + subview;
    }

    return elgg.normalize_url(path);
};