output.php

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<?php
function parse_urls($text) {

    // URI specification: http://www.ietf.org/rfc/rfc3986.txt
    // This varies from the specification in the following ways:
    //  * Supports non-ascii characters
    //  * Does not allow parentheses and single quotes
    //  * Cuts off commas, exclamation points, and periods off as last character

    // @todo this causes problems with <attr = "val">
    // must be in <attr="val"> format (no space).
    // By default htmlawed rewrites tags to this format.
    // if PHP supported conditional negative lookbehinds we could use this:
    // $r = preg_replace_callback('/(?<!=)(?<![ ])?(?<!["\'])((ht|f)tps?:\/\/[^\s\r\n\t<>"\'\!\(\),]+)/i',
    $r = preg_replace_callback('/(?<![=\/"\'])((ht|f)tps?:\/\/[^\s\r\n\t<>"\']+)/i',
    create_function(
        '$matches',
        '
            $url = $matches[1];
            $punc = "";
            $last = substr($url, -1, 1);
            if (in_array($last, array(".", "!", ",", "(", ")"))) {
                $punc = $last;
                $url = rtrim($url, ".!,()");
            }
            $urltext = str_replace("/", "/<wbr />", $url);
            return "<a href=\"$url\" rel=\"nofollow\">$urltext</a>$punc";
        '
    ), $text);

    return $r;
}

function elgg_autop($string) {
    return _elgg_services()->autoP->process($string);
}

function elgg_get_excerpt($text, $num_chars = 250) {
    $text = trim(elgg_strip_tags($text));
    $string_length = elgg_strlen($text);

    if ($string_length <= $num_chars) {
        return $text;
    }

    // handle cases
    $excerpt = elgg_substr($text, 0, $num_chars);
    $space = elgg_strrpos($excerpt, ' ', 0);

    // don't crop if can't find a space.
    if ($space === false) {
        $space = $num_chars;
    }
    $excerpt = trim(elgg_substr($excerpt, 0, $space));

    if ($string_length != elgg_strlen($excerpt)) {
        $excerpt .= '...';
    }

    return $excerpt;
}

function elgg_format_url($url) {
    return preg_replace('/&(?!amp;)/', '&amp;', $url);
}

function elgg_format_attributes(array $attrs = array()) {
    if (!is_array($attrs) || !count($attrs)) {
        return '';
    }

    $attrs = _elgg_clean_vars($attrs);
    $attributes = array();

    if (isset($attrs['js'])) {
        elgg_deprecated_notice('Use associative array of attr => val pairs instead of $vars[\'js\']', 1.8);

        if (!empty($attrs['js'])) {
            $attributes[] = $attrs['js'];
        }

        unset($attrs['js']);
    }

    foreach ($attrs as $attr => $val) {
        $attr = strtolower($attr);

        if ($val === true) {
            $val = $attr; //e.g. checked => true ==> checked="checked"
        }

        if ($val !== NULL && $val !== false && (is_array($val) || !is_object($val))) {
            if (is_array($val)) {
                $val = implode(' ', $val);
            }

            $val = htmlspecialchars($val, ENT_QUOTES, 'UTF-8', false);
            $attributes[] = "$attr=\"$val\"";
        }
    }

    return implode(' ', $attributes);
}

function elgg_format_element($tag_name, array $attributes = array(), $text = '', array $options = array()) {
    if (!is_string($tag_name)) {
        throw new InvalidArgumentException('$tag_name is required');
    }

    if (isset($options['is_void'])) {
        $is_void = $options['is_void'];
    } else {
        // from http://www.w3.org/TR/html-markup/syntax.html#syntax-elements
        $is_void = in_array(strtolower($tag_name), array(
            'area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input', 'keygen', 'link', 'menuitem',
            'meta', 'param', 'source', 'track', 'wbr'
        ));
    }

    if (!empty($options['encode_text'])) {
        $double_encode = empty($options['double_encode']) ? false : true;
        $text = htmlspecialchars($text, ENT_QUOTES, 'UTF-8', $double_encode);
    }

    if ($attributes) {
        $attrs = elgg_format_attributes($attributes);
        if ($attrs !== '') {
            $attrs = " $attrs";
        }
    } else {
        $attrs = '';
    }

    if ($is_void) {
        return empty($options['is_xml']) ? "<{$tag_name}{$attrs}>" : "<{$tag_name}{$attrs} />";
    } else {
        return "<{$tag_name}{$attrs}>$text</$tag_name>";
    }
}

function _elgg_clean_vars(array $vars = array()) {
    unset($vars['config']);
    unset($vars['url']);
    unset($vars['user']);

    // backwards compatibility code
    if (isset($vars['internalname'])) {
        if (!isset($vars['__ignoreInternalname'])) {
            $vars['name'] = $vars['internalname'];
        }
        unset($vars['internalname']);
    }

    if (isset($vars['internalid'])) {
        if (!isset($vars['__ignoreInternalid'])) {
            $vars['id'] = $vars['internalid'];
        }
        unset($vars['internalid']);
    }

    if (isset($vars['__ignoreInternalid'])) {
        unset($vars['__ignoreInternalid']);
    }

    if (isset($vars['__ignoreInternalname'])) {
        unset($vars['__ignoreInternalname']);
    }

    return $vars;
}

function elgg_normalize_url($url) {
    // see https://bugs.php.net/bug.php?id=51192
    // from the bookmarks save action.
    $php_5_2_13_and_below = version_compare(PHP_VERSION, '5.2.14', '<');
    $php_5_3_0_to_5_3_2 = version_compare(PHP_VERSION, '5.3.0', '>=') &&
            version_compare(PHP_VERSION, '5.3.3', '<');

    if ($php_5_2_13_and_below || $php_5_3_0_to_5_3_2) {
        $tmp_address = str_replace("-", "", $url);
        $validated = filter_var($tmp_address, FILTER_VALIDATE_URL);
    } else {
        $validated = filter_var($url, FILTER_VALIDATE_URL);
    }

    // work around for handling absoluate IRIs (RFC 3987) - see #4190
    if (!$validated && (strpos($url, 'http:') === 0) || (strpos($url, 'https:') === 0)) {
        $validated = true;
    }

    if ($validated) {
        // all normal URLs including mailto:
        return $url;

    } elseif (preg_match("#^(\#|\?|//)#i", $url)) {
        // '//example.com' (Shortcut for protocol.)
        // '?query=test', #target
        return $url;

    } elseif (stripos($url, 'javascript:') === 0 || stripos($url, 'mailto:') === 0) {
        // 'javascript:' and 'mailto:'
        // Not covered in FILTER_VALIDATE_URL
        return $url;

    } elseif (preg_match("#^[^/]*\.php(\?.*)?$#i", $url)) {
        // 'install.php', 'install.php?step=step'
        return elgg_get_site_url() . $url;

    } elseif (preg_match("#^[^/?]*\.#i", $url)) {
        // 'example.com', 'example.com/subpage'
        return "http://$url";

    } else {
        // 'page/handler', 'mod/plugin/file.php'

        // trim off any leading / because the site URL is stored
        // with a trailing /
        return elgg_get_site_url() . ltrim($url, '/');
    }
}

function elgg_get_friendly_title($title) {

    // return a URL friendly title to short circuit normal title formatting
    $params = array('title' => $title);
    $result = elgg_trigger_plugin_hook('format', 'friendly:title', $params, null);
    if ($result) {
        return $result;
    }

    // titles are often stored HTML encoded
    $title = html_entity_decode($title, ENT_QUOTES, 'UTF-8');

    $title = Elgg_Translit::urlize($title);

    return $title;
}

function elgg_get_friendly_time($time, $current_time = null) {

    if (!$current_time) {
        $current_time = time();
    }

    // return a time string to short circuit normal time formatting
    $params = array('time' => $time, 'current_time' => $current_time);
    $result = elgg_trigger_plugin_hook('format', 'friendly:time', $params, null);
    if ($result) {
        return $result;
    }

    $diff = abs((int)$current_time - (int)$time);

    $minute = 60;
    $hour = $minute * 60;
    $day = $hour * 24;

    if ($diff < $minute) {
        return elgg_echo("friendlytime:justnow");
    }

    if ($diff < $hour) {
        $granularity = ':minutes';
        $diff = round($diff / $minute);
    } else if ($diff < $day) {
        $granularity = ':hours';
        $diff = round($diff / $hour);
    } else {
        $granularity = ':days';
        $diff = round($diff / $day);
    }

    if ($diff == 0) {
        $diff = 1;
    }

    $future = ((int)$current_time - (int)$time < 0) ? ':future' : '';
    $singular = ($diff == 1) ? ':singular' : '';

    return elgg_echo("friendlytime{$future}{$granularity}{$singular}", array($diff));
}

function elgg_get_friendly_upload_error($error_code) {
    switch ($error_code) {
        case UPLOAD_ERR_OK:
            return '';

        case UPLOAD_ERR_INI_SIZE:
            $key = 'ini_size';
            break;

        case UPLOAD_ERR_FORM_SIZE:
            $key = 'form_size';
            break;

        case UPLOAD_ERR_PARTIAL:
            $key = 'partial';
            break;

        case UPLOAD_ERR_NO_FILE:
            $key = 'no_file';
            break;

        case UPLOAD_ERR_NO_TMP_DIR:
            $key = 'no_tmp_dir';
            break;

        case UPLOAD_ERR_CANT_WRITE:
            $key = 'cant_write';
            break;

        case UPLOAD_ERR_EXTENSION:
            $key = 'extension';
            break;

        default:
            $key = 'unknown';
            break;
    }

    return elgg_echo("upload:error:$key");
}


function elgg_strip_tags($string, $allowable_tags = null) {
    $params['original_string'] = $string;
    $params['allowable_tags'] = $allowable_tags;

    $string = strip_tags($string, $allowable_tags);
    $string = elgg_trigger_plugin_hook('format', 'strip_tags', $params, $string);

    return $string;
}

function _elgg_html_decode($string) {
    $string = str_replace(
        array('&gt;', '&lt;', '&amp;', '&quot;', '&#039;'),
        array('&amp;gt;', '&amp;lt;', '&amp;amp;', '&amp;quot;', '&amp;#039;'),
        $string
    );
    $string = html_entity_decode($string, ENT_NOQUOTES, 'UTF-8');
    $string = str_replace(
        array('&amp;gt;', '&amp;lt;', '&amp;amp;', '&amp;quot;', '&amp;#039;'),
        array('&gt;', '&lt;', '&amp;', '&quot;', '&#039;'),
        $string
    );
    return $string;
}

function _elgg_get_display_query($string) {
    //encode <,>,&, quotes and characters above 127
    if (function_exists('mb_convert_encoding')) {
        $display_query = mb_convert_encoding($string, 'HTML-ENTITIES', 'UTF-8');
    } else {
        // if no mbstring extension, we just strip characters
        $display_query = preg_replace("/[^\x01-\x7F]/", "", $string);
    }
    return htmlspecialchars($display_query, ENT_QUOTES, 'UTF-8', false);
}

function _elgg_output_unit_test($hook, $type, $value, $params) {
    global $CONFIG;
    $value[] = "{$CONFIG->path}engine/tests/ElggCoreOutputAutoPTest.php";
    return $value;
}

function _elgg_output_init() {
    elgg_register_plugin_hook_handler('unit_test', 'system', '_elgg_output_unit_test');
}

elgg_register_event_handler('init', 'system', '_elgg_output_init');