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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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 * Content bank files repository helpers.
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 *
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 * @package    repository_contentbank
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 * @copyright  2020 Mihail Geshoski <mihail@moodle.com>
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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 repository_contentbank;
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use repository_contentbank\browser\contentbank_browser;
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/**
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 * Helper class for content bank files repository.
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 *
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 * @package    repository_contentbank
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 * @copyright  2020 Mihail Geshoski <mihail@moodle.com>
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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 helper {
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    /**
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     * Get the content bank repository browser for a certain context.
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     *
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     * @param \context $context The context
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     * @return \repository_contentbank\browser\contentbank_browser|null The content bank repository browser
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     */
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    public static function get_contentbank_browser(\context $context): ?contentbank_browser {
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        switch ($context->contextlevel) {
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            case CONTEXT_SYSTEM:
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                return new \repository_contentbank\browser\contentbank_browser_context_system($context);
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            case CONTEXT_COURSECAT:
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                return new \repository_contentbank\browser\contentbank_browser_context_coursecat($context);
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            case CONTEXT_COURSE:
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                return new \repository_contentbank\browser\contentbank_browser_context_course($context);
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        }
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        return null;
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    }
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    /**
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     * Create the context folder node.
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     *
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     * @param string $name The name of the context folder node
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     * @param string $path The path to the context folder node
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     * @return array The context folder node
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     */
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    public static function create_context_folder_node(string $name, string $path): array {
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        global $OUTPUT;
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        return [
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            'title' => $name,
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            'datemodified' => '',
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            'datecreated' => '',
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            'path' => $path,
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            'thumbnail' => $OUTPUT->image_url(file_folder_icon())->out(false),
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            'children' => []
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        ];
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    }
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    /**
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     * Create the content bank content node.
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     *
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     * @param \core_contentbank\content $content The content bank content
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     * @return array|null The content bank content node
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     */
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    public static function create_contentbank_content_node(\core_contentbank\content $content): ?array {
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        global $OUTPUT;
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        // Only content files are currently supported, but should be able to create content folder nodes in the future.
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        // Early return if the content is not a stored file.
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        if (!$file = $content->get_file()) {
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            return null;
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        }
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        $params = [
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            'contextid' => $file->get_contextid(),
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            'component' => $file->get_component(),
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            'filearea'  => $file->get_filearea(),
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            'itemid'    => $file->get_itemid(),
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            'filepath'  => $file->get_filepath(),
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            'filename'  => $file->get_filename()
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        ];
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        $contenttype = $content->get_content_type_instance();
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        $encodedpath = base64_encode(json_encode($params));
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        $node = [
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            'shorttitle' => $content->get_name(),
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            'title' => $file->get_filename(),
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            'datemodified' => $file->get_timemodified(),
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            'datecreated' => $file->get_timecreated(),
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            'author' => $file->get_author(),
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            'license' => $file->get_license(),
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            'isref' => $file->is_external_file(),
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            'size' => $file->get_filesize(),
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            'source' => $encodedpath,
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            'icon' => $contenttype->get_icon($content),
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            'thumbnail' => $contenttype->get_icon($content)
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        ];
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        if ($file->get_status() == 666) {
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            $node['originalmissing'] = true;
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        }
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        return $node;
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    }
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    /**
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     * Generate a navigation node.
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     *
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     * @param \context $context The context
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     * @return array The navigation node
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     */
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    public static function create_navigation_node(\context $context): array {
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        return [
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            'path' => base64_encode(json_encode(['contextid' => $context->id])),
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            'name' => $context->get_context_name(false)
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        ];
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    }
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}