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/**
* Class with static back-end methods used by the file type tool.
*
* @package tool_filetypes
* @copyright 2014 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace tool_filetypes;
defined('MOODLE_INTERNAL') || die();
/**
* Class with static back-end methods used by the file type tool.
*
* @package tool_filetypes
* @copyright 2014 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class utils {
/**
* Checks if the given file type extension is invalid.
* The added file type extension must be unique and must not begin with a dot.
*
* @param string $extension Extension of the file type to add
* @param string $oldextension Extension prior to update (empty string if adding new type)
* @return bool True if it the file type trying to add already exists
*/
public static function is_extension_invalid($extension, $oldextension = '') {
$extension = trim($extension);
if ($extension === '' || $extension[0] === '.') {
return true;
}
$mimeinfo = get_mimetypes_array();
if ($oldextension !== '') {
unset($mimeinfo[$oldextension]);
}
return array_key_exists($extension, $mimeinfo);
}
/**
* Checks if we are allowed to turn on the 'default icon' option. You can
* only have one of these for a given MIME type.
*
* @param string $mimetype MIME type
* @param string $oldextension File extension name (before any change)
*/
public static function is_defaulticon_allowed($mimetype, $oldextension = '') {
$mimeinfo = get_mimetypes_array();
if ($oldextension !== '') {
unset($mimeinfo[$oldextension]);
}
foreach ($mimeinfo as $extension => $values) {
if ($values['type'] !== $mimetype) {
continue;
}
if (!empty($values['defaulticon'])) {
return false;
}
}
return true;
}
/**
* Gets all unique file type icons from a specific path, not including
* sub-directories.
*
* Icon files such as pdf.png, pdf-24.png and pdf-36.png etc. are counted as
* the same icon type.
*
* The resultant array has both key and value set to the icon name prefix,
* such as 'pdf' => 'pdf'.
*
* @param string $path The path of the icon path
* @return array An array of unique file icons within the given path
*/
public static function get_icons_from_path($path) {
$icons = array();
if ($handle = @opendir($path)) {
while (($file = readdir($handle)) !== false) {
$matches = array();
if (preg_match('~(.+?)(?:-24|-32|-48|-64|-72|-80|-96|-128|-256)?\.(?:svg|gif|png)$~',
$file, $matches)) {
$key = $matches[1];
$icons[$key] = $key;
}
}
closedir($handle);
}
ksort($icons);
return $icons;
}
/**
* Gets unique file type icons from pix/f folder.
*
* @return array An array of unique file type icons e.g. 'pdf' => 'pdf'
*/
public static function get_file_icons() {
global $CFG;
$path = $CFG->dirroot . '/pix/f';
return self::get_icons_from_path($path);
}
}