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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Class with static back-end methods used by the file type tool.
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*
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* @package tool_filetypes
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* @copyright 2014 The Open University
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace tool_filetypes;
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defined('MOODLE_INTERNAL') || die();
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/**
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* Class with static back-end methods used by the file type tool.
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*
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* @package tool_filetypes
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* @copyright 2014 The Open University
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class utils {
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/**
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* Checks if the given file type extension is invalid.
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* The added file type extension must be unique and must not begin with a dot.
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*
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* @param string $extension Extension of the file type to add
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* @param string $oldextension Extension prior to update (empty string if adding new type)
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* @return bool True if it the file type trying to add already exists
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*/
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public static function is_extension_invalid($extension, $oldextension = '') {
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$extension = trim($extension);
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if ($extension === '' || $extension[0] === '.') {
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return true;
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}
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$mimeinfo = get_mimetypes_array();
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if ($oldextension !== '') {
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unset($mimeinfo[$oldextension]);
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}
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return array_key_exists($extension, $mimeinfo);
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}
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/**
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* Checks if we are allowed to turn on the 'default icon' option. You can
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* only have one of these for a given MIME type.
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*
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* @param string $mimetype MIME type
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* @param string $oldextension File extension name (before any change)
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*/
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public static function is_defaulticon_allowed($mimetype, $oldextension = '') {
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$mimeinfo = get_mimetypes_array();
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if ($oldextension !== '') {
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unset($mimeinfo[$oldextension]);
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}
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foreach ($mimeinfo as $extension => $values) {
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if ($values['type'] !== $mimetype) {
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continue;
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}
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if (!empty($values['defaulticon'])) {
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return false;
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}
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}
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return true;
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}
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/**
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* Gets all unique file type icons from a specific path, not including
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* sub-directories.
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*
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* Icon files such as pdf.png, pdf-24.png and pdf-36.png etc. are counted as
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* the same icon type.
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*
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* The resultant array has both key and value set to the icon name prefix,
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* such as 'pdf' => 'pdf'.
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*
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* @param string $path The path of the icon path
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* @return array An array of unique file icons within the given path
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*/
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public static function get_icons_from_path($path) {
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$icons = array();
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if ($handle = @opendir($path)) {
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while (($file = readdir($handle)) !== false) {
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$matches = array();
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if (preg_match('~(.+?)(?:-24|-32|-48|-64|-72|-80|-96|-128|-256)?\.(?:svg|gif|png)$~',
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$file, $matches)) {
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$key = $matches[1];
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$icons[$key] = $key;
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}
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}
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closedir($handle);
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}
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ksort($icons);
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return $icons;
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}
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/**
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* Gets unique file type icons from pix/f folder.
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*
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* @return array An array of unique file type icons e.g. 'pdf' => 'pdf'
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*/
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public static function get_file_icons() {
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global $CFG;
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$path = $CFG->dirroot . '/pix/f';
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return self::get_icons_from_path($path);
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}
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}
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