presscodes/maera

<?php

class Maera_Required_Plugins {

    private $plugins;

    function __construct( $plugins = array() ) {

        $this->plugins = $plugins;

        add_action( 'admin_notices', array( $this, 'required_plugins_notices' ) );

        add_filter( 'maera/plugins/required', array( $this, 'add_filter' ) );

    }

    function add_filter( $required_plugins ) {
        return array_merge( $required_plugins, $this->plugins );
    }

    /**
     * Test if all required plugins are active or not.
     * If they are not, returns true;
     */
    public function test_missing() {

        $plugins = apply_filters( 'maera/plugins/required', array() );
        $status  = get_transient( 'maera_required_plugins_status' );

        // If the transient exists and is set to 'ok' then no need to proceed.
        if ( false === $status && 'ok' == $status ) {
            return 'ok';
        }

        if ( ! function_exists( 'is_plugin_active' ) ) {
            include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
        }

        foreach ( $plugins as $plugin ) {
            if ( ! is_plugin_active( $plugin['slug'] . '/' . $plugin['file'] ) ) {
                return 'bad';
            }
        }

        // If we're good to go, set the transient value to 'ok' for 2 minutes
        set_transient( 'maera_required_plugins_status', 'ok', 60 * 2 );

        return 'ok';

    }

    /**
     * Add the admin notices for the required plugins
     */
    function required_plugins_notices() {

        $plugin_messages = array();

        include_once( ABSPATH . 'wp-admin/includes/plugin.php' );

        foreach ( $this->plugins as $plugin ) {
            $install_link = '<a href="' . esc_url( network_admin_url( 'plugin-install.php?tab=plugin-information&plugin=' . $plugin['slug'] . '&TB_iframe=true&width=600&height=550' ) ) . '" class="thickbox" title="More info about ' . $plugin['name'] . '">Install and activate ' . $plugin['name'] . '</a>';
            if ( ! is_plugin_active( $plugin['slug'] . '/' . $plugin['file'] ) ) {
                $plugin_url  = 'https://wordpress.org/plugins/' . $plugin['slug'] . '/';
                $install_url = self_admin_url( 'update.php?action=install-plugin&plugin=' . $plugin['slug'] . '&_wpnonce=install-plugin_' . $plugin['slug'] );
                $plugin_messages[] = 'This theme requires you to install and activate the ' . $plugin['name'] . ' plugin, ' . $install_link . '.';
            }
        }

        if ( 0 < count( $plugin_messages ) ) {
            echo '<div id="message" class="error maera-required-plugins">';

            foreach( $plugin_messages as $message ) {
                echo '<p>' . $message . '</p>';
            }

            echo '</div>';
        }

    }

}