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Editing: Course_Duplicator.php

<?php

namespace TUTOR_PRO;

use TUTOR\Input;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class Course_Duplicator {
	private $necessary_post_columns = array(
		'post_author',
		'post_content',
		'post_title',
		'post_excerpt',
		'post_status',
		'comment_status',
		'ping_status',
		'post_password',
		'post_name',
		'to_ping',
		'pinged',
		'post_content_filtered',
		'menu_order',
		'post_type',
		'post_mime_type',
	);

private $necessary_child_types = array(
		'topics',
		'lesson',
		'tutor_quiz',
		// 'tutor_announcements', // Announcment is probably not necessary in duplicated course since there is no student yet in the new one
		'tutor_assignments',
	);

private $allowed_user_role = array(
		'administrator',
		'editor',
		'tutor_instructor',
	);

// Store duplicated IDs here to avoid accidental infinity recursion.
	private $duplicated_post_ids = array();

function __construct( $register_hooks = true ) {
		if ( $register_hooks ) {
			add_action( 'wp_loaded', array( $this, 'init_duplicator' ) );
			add_filter( 'post_row_actions', array( $this, 'register_duplicate_button' ), 10, 2 );
			add_action( 'tutor_course_dashboard_actions_after', array( $this, 'duplicate_button_in_dashboard' ) );
		}
		add_action( 'tutor_admin_middle_course_list_action', array( $this, 'add_course_duplicate_menu' ) );
	}

private function get_duplicator_html( $course_id, bool $is_wp_admin, $class = '' ) {
		return '<a class="' . $class . '" href="?tutor_action=duplicate_course&is_wp_admin=' . ( $is_wp_admin ? 'yes' : 'no' ) . '&course_id=' . $course_id . '" aria-label="' . __( 'Duplicate', 'tutor-pro' ) . '">
                ' . __( 'Duplicate', 'tutor-pro' ) . '
            </a>';
	}

private function get_course_edit_link( $course_id, bool $is_admin ) {
		return $is_admin ? get_edit_post_link( $course_id, null ) : tutor_utils()->get_tutor_dashboard_page_permalink( 'create-course/?course_ID=' . $course_id );
	}

public function duplicate_button_in_dashboard( $course_id ) {

echo $this->get_duplicator_html( $course_id, false, 'tutor-mycourse-edit' );
	}

public function register_duplicate_button( $actions, $post ) {
		if ( $post->post_type == tutor()->course_post_type ) {
			$actions[] = $this->get_duplicator_html( $post->ID, true );
		}

return $actions;
	}

/**
	 * Handle Course duplicate for WP Admin and Frontend Dashboard
	 *
	 * @return void
	 * 
	 * @since 2.0.0
	 */
	public function init_duplicator() {
		$action = Input::get( 'tutor_action' );
		$id     = Input::get( 'course_id', 0, Input::TYPE_INT );

if ( 'duplicate_course' !== $action || 0 === $id ) {
			// This request is for something else or invalid
			return;
		}

if ( $this->is_valid_user_role() ) {
			// Duplicate the post.
			$new_post_id = $this->duplicate_post( $id );

if ( $new_post_id ) {
				$is_wp_admin	= is_admin();
				$flash_message	= __( 'Course Duplicated Successfully!', 'tutor-pro' );
				if ( $is_wp_admin ) {
					$link = admin_url( 'admin.php?page=tutor' );
				} else {
					$link = tutor_utils()->tutor_dashboard_url( 'my-courses/draft-courses' );
				}

tutor_utils()->redirect_to( $link, $flash_message );
				exit;
			}
		}

exit( 'You are not allowed for this action.' );
	}

private function is_valid_user_role() {
		$current_user = wp_get_current_user();

if ( is_object( $current_user ) && property_exists( $current_user, 'roles' ) ) {
			$roles            = (array) $current_user->roles;
			$different        = array_diff( $this->allowed_user_role, $roles );
			$exist_in_allowed = count( $different ) < count( $this->allowed_user_role );

return $exist_in_allowed;
		}
	}

/**
	 * Duplicate post by using recursive mechanism
	 *
	 * @param int $post_id  post id that need to be duplicated.
	 * @param int $absolute_course_id optional.
	 * @param int $new_parent_id optional.
	 * @param int $new_id optional.
	 *
	 * @return void
	 */
	public function duplicate_post( $post_id, $absolute_course_id = null, $new_parent_id = 0, $new_id = null ) {

if ( ! $post_id || ! is_numeric( $post_id ) ) {
			return;
		}

$post = get_post( $post_id );
		$post = is_object( $post ) ? (array) $post : null;

if ( ! $post ) {
			// Return right from here.
			return false;
		}

// Create new post using the old values.
		$post                = $this->strip_unnecessary_columns( $post );
		$post['post_author'] = get_current_user_id();
		$post['post_parent'] = $new_parent_id;
		$post['post_status'] = $new_parent_id > 0 ? 'publish' : 'draft';
		$post['post_name']   = tutor_utils()->get_unique_slug( sanitize_title( $post['post_name'], 'untitled-course' ) );
		! $new_id ? $new_id  = wp_insert_post( $post ) : 0;

/**
		 * Add meta flag for duplicate number
		 * For ex: Copy 1 ,Copy 2, so that it can be identified how many
		 * times a course has been duplicated
		 *
		 * @since v2.0.0
		 */
		if ( $new_id ) {
			$has_duplicator_of_post = get_post_meta( $post_id, 'tutor-course-duplicate-' . $post_id, true );
			if ( $has_duplicator_of_post ) {
				update_post_meta( $post_id, 'tutor-course-duplicate-' . $post_id, (int) ++$has_duplicator_of_post );
			} else {
				update_post_meta( $post_id, 'tutor-course-duplicate-' . $post_id, 1 );
			}

/**
			 * Show copy text only for course
			 *
			 * @since 2.1.7
			 */
			$copy_text = '';
			if ( tutor()->course_post_type === $post['post_type'] ) {
				$copy_text = ' (' . __( 'Copy ', 'tutor-pro' ) . get_post_meta( $post_id, 'tutor-course-duplicate-' . $post_id, 1 ) . ')';
			}

self::update_course( array( 'ID' => $new_id ), array( 'post_title' => $post['post_title'] . $copy_text ) );
		}

// Duplicate post meta.
		$this->duplicate_post_meta( $post_id, $new_id, $absolute_course_id );

// Assign taxonomy.
		$this->assign_post_taxonomy( $post_id, $new_id, 'course-category' );
		$this->assign_post_taxonomy( $post_id, $new_id, 'course-tag' );

// Duplicate quiz question if it is quiz post type.
		'tutor_quiz' === $post['post_type'] ? $this->duplicate_quiz_dependency( $post_id, $new_id, false ) : 0;

// Set it as done.
		$this->duplicated_post_ids[] = (int) $post_id;

// Now duplicate childs like topic, lesson, etc.
		$childs = $this->get_child_post_ids( $post_id );

foreach ( $childs as $child_id ) {
			if ( in_array( (int) $child_id, $this->duplicated_post_ids ) ) {
				// Avoid accidental infinity recursion.
				continue;
			}

$this->duplicate_post( $child_id, ( $absolute_course_id ? $absolute_course_id : $new_id ), $new_id );
		}

return $new_id;
	}

/**
	 * Duplicate post meta
	 *
	 * @param int $old_id  main post id.
	 * @param int $new_id  new duplicated post id.
	 * @param int $absolute_course_id course id.
	 *
	 * @return void
	 */
	private function duplicate_post_meta( $old_id, $new_id, $absolute_course_id ) {

// Get existing meta from old post.
		$meta_array                             = get_post_meta( $old_id );
		! is_array( $meta_array ) ? $meta_array = array() : 0;

// Add these meta to newly created post.
		foreach ( $meta_array as $name => $value ) {

// Convert to singular value from second level array.
			$value = is_array( $value ) ? ( isset( $value[0] ) ? $value[0] : '' ) : '';
			$value = is_serialized( $value ) ? unserialize( $value ) : $value;

// Replace old course ID meta with new one.
			'_tutor_course_price_type' === $name ? $value = 'free' : 0;

if ( '_tutor_course_product_id' === $name ) {
				continue;
			}

/**
			 * Course assignment linked with new duplicated course id
			 *
			 * @since v2.0.7
			 */
			if ( $name === '_tutor_course_id_for_assignments' ) {
				$value = $absolute_course_id;
			}
			update_post_meta( $new_id, $name, $value );
		}
	}

private function assign_post_taxonomy( $old_id, $new_id, $taxonomy ) {
		$old_terms                            = get_the_terms( $old_id, $taxonomy );
		! is_array( $old_terms ) ? $old_terms = array() : 0;

// Extract terms IDs
		$term_ids = array();
		foreach ( $old_terms as $term ) {
			$term_ids[] = $term->term_id;
		}

// Assign the terms
		count( $term_ids ) > 0 ? wp_set_post_terms( $new_id, $term_ids, $taxonomy ) : 0;
	}

private function duplicate_quiz_dependency( $old_context_id, $new_context_id, bool $is_answer ) {

$table_name     = $is_answer ? 'tutor_quiz_question_answers' : 'tutor_quiz_questions';
		$rel_id_column  = $is_answer ? 'belongs_question_id' : 'quiz_id';
		$base_id_column = $is_answer ? 'answer_id' : 'question_id';

global $wpdb, $table_prefix;
		$context_table = $table_prefix . $table_name;

// Get quiz quesions by quiz post ID
		$query  = 'SELECT * FROM ' . $context_table . ' WHERE ' . $rel_id_column . '=' . $old_context_id;
		$result = $wpdb->get_results( $query );

if ( is_array( $result ) && ! empty( $result ) ) {

// Loop through every question and duplicate
			foreach ( $result as $context ) {
				$context = (array) $context;

$old_stuff_id = $context[ $base_id_column ];

unset( $context[ $base_id_column ] );
				$context[ $rel_id_column ] = $new_context_id;

// Insert new row
				$wpdb->insert( $context_table, $context );

// Now copy quiz question answers
				! $is_answer ? $this->duplicate_quiz_dependency( $old_stuff_id, $wpdb->insert_id, true ) : 0;
			}
		}
	}

private function get_child_post_ids( $parent_id ) {

$children = get_children(
			array(
				'post_parent'    => $parent_id,
				'post_type'      => $this->necessary_child_types,
				'posts_per_page' => -1,
				'orderby'        => 'ID',
				'order'          => 'ASC',
			)
		);

! is_array( $children ) ? $children = array() : 0;

$child_ids = array();
		foreach ( $children as $child_post ) {
			is_object( $child_post ) ? $child_ids[] = (int) $child_post->ID : 0;
		}

return $child_ids;
	}

private function strip_unnecessary_columns( array $post ) {
		$new_array = array();

foreach ( $post as $column => $value ) {
			if ( in_array( $column, $this->necessary_post_columns ) ) {
				// Kepp only if it exist in ncessary column list
				$new_array[ $column ] = $value;
			}
		}

return $new_array;
	}

public function add_course_duplicate_menu( $id ) {
		$duplicate = '?tutor_action=duplicate_course&is_wp_admin=' . ( is_admin() ? 'yes' : 'no' ) . '&course_id=' . $id;
		?>
		<a class="tutor-dropdown-item" href="<?php echo esc_url( $duplicate ); ?>">
			<i class="tutor-icon-copy tutor-mr-8" area-hidden="true"></i>
			<span><?php esc_html_e( 'Duplicate', 'tutor' ); ?></span>
		</a>
		<?php
	}

/**
	 * Update course
	 *
	 * @param array $where | where condition required.
	 * @param array $data | data that need to be updated required.
	 *
	 * @return bool | true on success, false on failure.
	 *
	 * @since v2.0.0
	 */
	public static function update_course( array $where, array $data ) : bool {
		global $wpdb;
		$table  = $wpdb->posts;
		$update = $wpdb->update(
			$table,
			$data,
			$where
		);
		return $update ? true : false;
	}
}

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Editing: Course_Duplicator.php

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