Untitled

<?php
/*
Plugin Name: Show Content Only
Plugin URI: https://katz.co/content-only/
Description: Display only the post's content, without a theme, scripts or stylesheets.
Author: Katz Web Services, Inc.
Author URI: http://www.katzwebservices.com
Version: 1.3.1
Text Domain: show-content-only
*/

/*  Copyright 2014  Katz Web Services, Inc.  (email : info@katzwebdesign.com)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

class ShowContentOnly {

    function __construct() {
        add_action( 'init', array( $this, 'languages' ) );
        add_action( 'wp', array( $this, 'keyword' ) );
        add_action( 'admin_menu', array( $this, 'meta_box' ) );
    }

    function languages() {
        load_plugin_textdomain( 'show-content-only', false, untrailingslashit( basename( dirname( __FILE__ ) ) ) . '/languages' );
    }

    function keyword() {
        global $post;

        if ( isset( $_GET['rand'] )) {
            foreach ( get_posts ( array( 'numberposts' => 1, 'orderby' => 'rand' ) ) as $post ) {
                header('Location: ' . get_permalink ( $post->ID ));
                exit;
            }

        }

        if ( isset( $_GET['content-only'] ) && is_singular() ) {
            the_post();
            echo '<html><head><meta name="robots" value="noindex,nofollow" />';
            echo "<h1>";
            the_title();
            echo "</h1>";
            if ( ! empty( $_GET['js'] ) ) {
                wp_print_scripts();
            }
            if ( ! empty( $_GET['css'] ) ) {
                wp_head();
                wp_print_styles();
                if ( function_exists( 'post_class' ) ) {
                    echo '</head><body ';
                    post_class();
                    echo '>';
                } else {
                    echo '</head><body>';
                }
            } else {

            }

            if ( isset( $_GET['plain'] ) ) {
                echo $this->get_the_content();
            } else {
                $this->the_content();
            }

            if ( isset( $_GET['tags'] ) ) {
                the_tags( '<ul><li>', '</li><li>', '</li></ul>' );
            }

            if ( isset( $_GET['categories'] ) ) {
                the_category();
            }
            echo '</body></html>';
            die();
        }
    }

    function meta_box() {
        $args = array(
            'public' => true
        );
        $types = get_post_types( $args );
        foreach ( $types as $type ) {
        add_meta_box( 'contentonly', __( 'Show Content Only Links', 'show-content-only' ), array(
                $this,
                'links'
            ), $type, 'side', 'high' );
        }
    }

    // Meta box content
    function links() {
        global $post;
        if ( isset( $post->ID ) && $post->ID != 0 ) {
            $p     = $post->post_type == 'page' ? 'page_id' : 'p';
            $links = array(
                __('Content only', 'show-content-only') => array(
                    $p             => $post->ID,
                    'content-only' => true
                ),
                __('Content + Styles', 'show-content-only')           => array(
                    $p             => $post->ID,
                    'content-only' => true,
                    'css'          => true
                ),
                __('Content + Tags', 'show-content-only')             => array(
                    $p             => $post->ID,
                    'content-only' => true,
                    'tags'         => true
                ),
                __('Content + Categories', 'show-content-only')       => array(
                    $p             => $post->ID,
                    'content-only' => true,
                    'categories'   => true
                ),
                __('Content, Tags & Categories', 'show-content-only') => array(
                    $p             => $post->ID,
                    'content-only' => true,
                    'categories'   => true,
                    'tags'         => true
                ),
            );
            if ( $links ) {
                echo '<ul>';
                foreach ( $links as $name => $link ) {
                    $link = htmlentities( add_query_arg( $link, get_option( 'home' ) . '/' ) );
                    echo '<li><a href="' . $link . '" class="button button-small">' . esc_html( $name ) . '</a></li>';
                }
                echo '</ul>';
            }
        } else {
            echo '<p>' . esc_html__( 'You must publish or save this post before Show Content Only links become available.', 'show-content-only' ) . '</p>';
        }
    }

    /**
     * Display the post content.
     *
     * @since 0.71
     *
     * @param string $more_link_text Optional. Content for when there is more text.
     * @param string $stripteaser Optional. Teaser content before the more text.
     * @param string $more_file Optional. Not used.
     */
    function the_content( $more_link_text = null, $stripteaser = 0, $more_file = '' ) {
        $content = $this->get_the_content( $more_link_text, $stripteaser, $more_file );
        $content = apply_filters( 'the_content', $content );
        $content = str_replace( ']]>', ']]&gt;', $content );
        echo $content;
    }

    /**
     * Retrieve the post content.
     *
     * @since 0.71
     *
     * @param string $more_link_text Optional. Content for when there is more text.
     * @param string $stripteaser Optional. Teaser content before the more text.
     * @param string $more_file Optional. Not used.
     *
     * @return string
     */
    function get_the_content( $more_link_text = null, $stripteaser = 0, $more_file = '' ) {
        global $id, $post, $more, $page, $pages, $multipage, $preview, $pagenow;

        if ( null === $more_link_text ) {
            $more_link_text = __( '(more...)', 'show-content-only' );
        }

        $output    = '';
        $hasTeaser = false;

        // If post password required and it doesn't match the cookie.
        if ( post_password_required( $post ) ) {
            $output = get_the_password_form();

            return $output;
        }

        if ( $more_file != '' ) {
            $file = $more_file;
        } else {
            $file = $pagenow;
        } //$_SERVER['PHP_SELF'];

        if ( $page > count( $pages ) ) // if the requested page doesn't exist
        {
            $page = count( $pages );
        } // give them the highest numbered page that DOES exist

        $content = $pages[ $page - 1 ];
        if ( preg_match( '/<!--more(.*?)?-->/', $content, $matches ) ) {
            $content = explode( $matches[0], $content, 2 );
            if ( ! empty( $matches[1] ) && ! empty( $more_link_text ) ) {
                $more_link_text = strip_tags( wp_kses_no_null( trim( $matches[1] ) ) );
            }

            $hasTeaser = true;
        } else {
            $content = array( $content );
        }
        if ( ( false !== strpos( $post->post_content, '<!--noteaser-->' ) && ( ( ! $multipage ) || ( $page == 1 ) ) ) ) {
            $stripteaser = 1;
        }
        $teaser = $content[0];
        if ( ( $more ) && ( $stripteaser ) && ( $hasTeaser ) ) {
            $teaser = '';
        }
        $output .= $teaser;
        if ( count( $content ) > 1 ) {
            if ( $more ) {
                $output .= '<span id="more-' . $id . '"></span>' . $content[1];
            } else {
                if ( ! empty( $more_link_text ) ) {
                    $output .= apply_filters( 'the_content_more_link', ' <a href="' . get_permalink() . "#more-$id\" class=\"more-link\" rel=\"nofollow\">$more_link_text</a>", $more_link_text );
                }
                $output = force_balance_tags( $output );
            }

        }
        if ( $preview ) // preview fix for javascript bug with foreign languages
        {
            $output = preg_replace_callback( '/\%u([0-9A-F]{4})/', create_function( '$match', 'return "&#" . base_convert($match[1], 16, 10) . ";";' ), $output );
        }

        $output = do_shortcode( $output );

        return $output;
    }
}

new ShowContentOnly;