Global Accessibility Awareness Day widget plugin for WordPress | MIT License - https://github.com/nfreear/gaad-widget ~ http://globalaccessibilityawarenessday.org

wordpress.gaad-widget-plugin.php

<?php namespace Nfreear\WordPress\Plugins\GAAD;

/**
 * Plugin Name: Global Accessibility Awareness Day widget
 * Plugin URI:  https://github.com/nfreear/gaad-widget
 * Description: Shortcode and functionality to embed the GAAD widget ~ http://globalaccessibilityawarenessday.org
 * Author:      Nick Freear
 * Author URI:  https://twitter.com/nfreear
 * Version:     2.2-alpha
 *
 * @license     https://nfreear.mit-license.org MIT License
 * @copyright   © 2017 Nick Freear, 14-May-2017.
 * @link        https://gist.github.com/nfreear/e5520adbb930e537ef5fe2e0aab231d1#
 * @link        http://globalaccessibilityawarenessday.org/
 */

class GAAD_Widget_Plugin {

    const SHORTCODE = 'GAAD';
    const TEMPLATE  = "<div id='id-gaad'></div>";
    const VERSION   = '2.1-beta';
    const SCRIPT_URL= 'https://cdn.rawgit.com/nfreear/gaad-widget/%s/build/GAAD.widget.js';

    private $wp_head = false;

    public function __construct() {
        $this->wp_head = self::get_option( 'gaad_widget_wp_head' );

        add_shortcode( self::SHORTCODE, [ &$this, 'shortcode' ] );
        add_action( 'wp_enqueue_scripts', [ &$this, 'enqueue_scripts' ] );
        add_filter( 'script_loader_tag', [ &$this, 'script_loader_tag' ], 10, 2 );

        if ( $this->wp_head ) {
            add_action( 'wp_head', [ &$this, 'wp_head' ] );
        }
    }

    public function wp_head( $name ) {
        self::debug([ __FUNCTION__, $name ]);

        echo self::TEMPLATE;
    }

    public function shortcode( $attrs = [], $content = null ) {
        $inp = (object) shortcode_atts( [
            'days_before' => self::get_option( 'gaad_widget_days_before', 15 ),
            'days_after'  => self::get_option( 'gaad_widget_days_after', 10 ),
        ], $attrs );

        return self::TEMPLATE . $content;
    }

    public function enqueue_scripts() {
        $version = self::get_option( 'gaad_widget_version', self::VERSION );
        $script_url = sprintf( self::SCRIPT_URL, $version );

        self::debug([ 'fn' => __FUNCTION__, 'gaad_widget_version' => $version, 'wp_default_theme' => self::get_option( 'wp_default_theme' ) ]);

        $result = wp_enqueue_script( 'gaad-widget', $script_url, [ 'jquery' ], $ver = null, $in_footer = true );

        if ( ! $this->wp_head ) {
            $tpl = addslashes( self::TEMPLATE );
            // wp_enqueue_script( 'gaad-widget-inj', '_404_#-gaad-widget-xxx.js', [ 'jquery' ], $ver = false, $in_footer = true );
            wp_add_inline_script( 'gaad-widget', "jQuery('#masthead').after('$tpl');console.warn('WP:gaad-widget')", $position = 'before' );
        }
        return $result;
    }

    public function script_loader_tag( $tag, $handle ) {
        if ( $handle === 'gaad-widget' ) {
            $json_opt = json_encode([
                'days_before' => self::get_option( 'gaad_widget_days_before', 15 ),
                'days_after'  => self::get_option( 'gaad_widget_days_after', 10 ),
                'theme' => self::get_option( 'gaad_widget_theme', 'blue' ),
                'client' => 'WordPress',
            ]);

            return str_replace( '></sc', " data-gaad='$json_opt'><\/sc", $tag );
            // return str_replace( '<script', "<script data-gaad='$json_opt'", $tag );
        }
        return $tag;
    }

    public static function get_option( $option, $default = false ) {
        $OPT = strtoupper( $option );
        $default = defined( $OPT ) ? constant( $OPT ) : $default;
        return get_option( $option, $default );
    }

    public static function debug( $obj ) {
        static $count = 0;
        $str = sprintf( 'X-gaad-widget-plugin-%02d: %s', $count, json_encode( $obj ) );
        if (headers_sent()) {
            echo "<!-- $str -->";
        } else {
            header($str);
        }
        $count++;
    }
}

$wp_plugin = new GAAD_Widget_Plugin();

// End.