rel posts

<?php
/*
Plugin Name: WordPress Related Posts
Version: 2.4
Plugin URI: http://wordpress.org/extend/plugins/wordpress-23-related-posts-plugin/
Description: Quickly increase your readers' engagement with your posts by adding Related Posts in the footer of your content.
Author: Zemanta Ltd.
Author URI: http://www.zemanta.com
*/

define('WP_RP_VERSION', '2.4');

include_once(dirname(__FILE__) . '/config.php');
include_once(dirname(__FILE__) . '/lib/stemmer.php');

include_once(dirname(__FILE__) . '/admin_notices.php');
include_once(dirname(__FILE__) . '/notifications.php');
include_once(dirname(__FILE__) . '/widget.php');
include_once(dirname(__FILE__) . '/thumbnailer.php');
include_once(dirname(__FILE__) . '/settings.php');
include_once(dirname(__FILE__) . '/recommendations.php');
include_once(dirname(__FILE__) . '/dashboard_widget.php');
include_once(dirname(__FILE__) . '/compatibility.php');

register_activation_hook(__FILE__, 'wp_rp_activate_hook');
register_deactivation_hook(__FILE__, 'wp_rp_deactivate_hook');

add_action('wp_head', 'wp_rp_head_resources');
add_action('wp_before_admin_bar_render', 'wp_rp_extend_adminbar');

function wp_rp_extend_adminbar() {
    global $wp_admin_bar;

    if(!is_super_admin() || !is_admin_bar_showing())
        return;

    $wp_admin_bar->add_menu(array(
        'id' => 'wp_rp_adminbar_menu',
        'title' => __('Related Posts', 'wp_related_posts'),
        'href' => admin_url('admin.php?page=wordpress-related-posts&ref=adminbar')
    ));
}

global $wp_rp_output;
$wp_rp_output = array();
function wp_rp_add_related_posts_hook($content) {
    global $wp_rp_output, $post;
    $options = wp_rp_get_options();

    if ($post->post_type === 'post' && ($options["on_single_post"] || (is_feed() && $options["on_rss"]))) {
        if (!isset($wp_rp_output[$post->ID])) {
            $wp_rp_output[$post->ID] = wp_rp_get_related_posts();
        }
        $content = str_replace('%RELATEDPOSTS%', '', $content); // used for gp
        $content = $content . $wp_rp_output[$post->ID];
    }

    return $content;
}
add_filter('the_content', 'wp_rp_add_related_posts_hook', 101);

function wp_rp_append_posts(&$related_posts, $fetch_function_name) {
    $options = wp_rp_get_options();

    $limit = $options['max_related_posts'];

    $len = sizeof($related_posts);
    $num_missing_posts = $limit - $len;
    if ($num_missing_posts > 0) {
        $exclude_ids = array_map(create_function('$p', 'return $p->ID;'), $related_posts);

        $posts = call_user_func($fetch_function_name, $num_missing_posts, $exclude_ids);
        if ($posts) {
            $related_posts = array_merge($related_posts, $posts);
        }
    }
}

function wp_rp_fetch_posts_and_title() {
    $options = wp_rp_get_options();

    $limit = $options['max_related_posts'];
    $title = $options["related_posts_title"];

    $related_posts = array();

    wp_rp_append_posts($related_posts, 'wp_rp_fetch_related_posts_v2');
    wp_rp_append_posts($related_posts, 'wp_rp_fetch_related_posts');
    wp_rp_append_posts($related_posts, 'wp_rp_fetch_random_posts');

    if(function_exists('qtrans_postsFilter')) {
        $related_posts = qtrans_postsFilter($related_posts);
    }

    return array(
        "posts" => $related_posts,
        "title" => $title
    );
}

function wp_rp_generate_related_posts_list_items($related_posts) {
    $options = wp_rp_get_options();
    $output = "";
    $i = 0;

    $statistics_enabled = $options['ctr_dashboard_enabled'];

    foreach ($related_posts as $related_post ) {
        $data_attrs = '';
        if ($statistics_enabled) {
            $data_attrs .= 'data-position="' . $i++ . '" data-poid="in-' . $related_post->ID . '" ';
        }

        $output .= '<li ' . $data_attrs . '>';

        $img = wp_rp_get_post_thumbnail_img($related_post);
        if ($img) {
            $output .=  '<a href="' . get_permalink($related_post->ID) . '" class="wp_rp_thumbnail">' . $img . '</a>';
        }

        if (!$options["display_thumbnail"] || ($options["display_thumbnail"] && ($options["thumbnail_display_title"] || !$img))) {
            if ($options["display_publish_date"]){
                $dateformat = get_option('date_format');
                $output .= mysql2date($dateformat, $related_post->post_date) . " -- ";
            }

            $output .= '<a href="' . get_permalink($related_post->ID) . '" class="wp_rp_title">' . wptexturize($related_post->post_title) . '</a>';

            if ($options["display_comment_count"]){
                $output .=  " (" . $related_post->comment_count . ")";
            }

            if ($options["display_excerpt"]){
                $excerpt_max_length = $options["excerpt_max_length"];
                if($related_post->post_excerpt){
                    $output .= '<br /><small>' . (mb_substr(strip_shortcodes(strip_tags($related_post->post_excerpt)), 0, $excerpt_max_length)) . '...</small>';
                } else {
                    $output .= '<br /><small>' . (mb_substr(strip_shortcodes(strip_tags($related_post->post_content)), 0, $excerpt_max_length)) . '...</small>';
                }
            }
        }
        $output .=  '</li>';
    }

    return $output;
}

function wp_rp_should_exclude() {
    global $wpdb, $post;

    if (!$post || !$post->ID) {
        return true;
    }

    $options = wp_rp_get_options();

    if(!$options['exclude_categories']) { return false; }

    $q = 'SELECT COUNT(tt.term_id) FROM '. $wpdb->term_taxonomy.' tt, ' . $wpdb->term_relationships.' tr WHERE tt.taxonomy = \'category\' AND tt.term_taxonomy_id = tr.term_taxonomy_id AND tr.object_id = '. $post->ID . ' AND tt.term_id IN (' . $options['exclude_categories'] . ')';

    $result = $wpdb->get_col($q);

    $count = (int) $result[0];

    return $count > 0;
}

function wp_rp_ajax_blogger_network_blacklist_callback() {
    if (!current_user_can('delete_users')) {
        die();
    }

    $sourcefeed = (int) $_GET['sourcefeed'];

    $meta = wp_rp_get_meta();

    $blog_id = $meta['blog_id'];
    $auth_key = $meta['auth_key'];
    $req_options = array(
        'timeout' => 5
    );
    $url = WP_RP_CTR_DASHBOARD_URL . "blacklist/?blog_id=$blog_id&auth_key=$auth_key&sfid=$sourcefeed";
    $response = wp_remote_get($url, $req_options);

    if (wp_remote_retrieve_response_code($response) == 200) {
        $body = wp_remote_retrieve_body($response);
        if ($body) {
            $doc = json_decode($body);
            if ($doc && $doc->status === 'ok') {
                header_remove();
                header('Content-Type: text/javascript');
                echo "if(window['_wp_rp_blacklist_callback$sourcefeed']) window._wp_rp_blacklist_callback$sourcefeed();";
            }
        }
    }
    die();
}

add_action('wp_ajax_rp_blogger_network_blacklist', 'wp_rp_ajax_blogger_network_blacklist_callback');

function wp_rp_head_resources() {
    global $post, $wpdb;

    if (wp_rp_should_exclude()) {
        return;
    }

    $meta = wp_rp_get_meta();
    $options = wp_rp_get_options();
    $statistics_enabled = false;
    $remote_recommendations = false;
    $output = '';

    if (is_single()) {
        $statistics_enabled = $options['ctr_dashboard_enabled'] && $meta['blog_id'] && $meta['auth_key'];
        $remote_recommendations = $meta['remote_recommendations'] && $statistics_enabled;
    }

    if ($statistics_enabled) {
        $tags = $wpdb->get_col("SELECT label FROM " . $wpdb->prefix . "wp_rp_tags WHERE post_id=$post->ID ORDER BY weight desc;", 0);
        if (!empty($tags)) {
            $post_tags = '[' . implode(', ', array_map(create_function('$v', 'return "\'" . urlencode(substr($v, strpos($v, \'_\') + 1)) . "\'";'), $tags)) . ']';
        } else {
            $post_tags = '[]';
        }

        $output .= "<script type=\"text/javascript\">\n" .
            "\twindow._wp_rp_blog_id = '" . esc_js($meta['blog_id']) . "';\n" .
            "\twindow._wp_rp_ajax_img_src_url = '" . esc_js(WP_RP_CTR_REPORT_URL) . "';\n" .
            "\twindow._wp_rp_post_id = '" . esc_js($post->ID) . "';\n" .
            "\twindow._wp_rp_thumbnails = " . ($options['display_thumbnail'] ? 'true' : 'false') . ";\n" .
            "\twindow._wp_rp_post_title = '" . urlencode($post->post_title) . "';\n" .
            "\twindow._wp_rp_post_tags = {$post_tags};\n" .
            "\twindow._wp_rp_static_base_url = '" . esc_js(WP_RP_STATIC_BASE_URL) . "';\n" .
            "\twindow._wp_rp_promoted_content = " . ($options['promoted_content_enabled'] ? 'true' : 'false') . ";\n" .
            "\twindow._wp_rp_plugin_version = '" . WP_RP_VERSION . "';\n" .
            "\twindow._wp_rp_traffic_exchange = " . ($options['traffic_exchange_enabled'] ? 'true' : 'false') . ";\n" .
            (current_user_can('delete_users') ? "\twindow._wp_rp_admin_ajax_url = '" . admin_url('admin-ajax.php') . "';\n" : '') .
            "\twindow._wp_rp_num_rel_posts = '" . $options['max_related_posts'] . "';\n" .
            "</script>\n";
    }

    if ($remote_recommendations) {
        $output .= '<script type="text/javascript" src="' . WP_RP_STATIC_BASE_URL . WP_RP_STATIC_RECOMMENDATIONS_JS_FILE . '?version=' . WP_RP_VERSION . '"></script>' . "\n";
        $output .= '<link rel="stylesheet" href="' . WP_RP_STATIC_BASE_URL . WP_RP_STATIC_RECOMMENDATIONS_CSS_FILE . '?version=' . WP_RP_VERSION . '" />' . "\n";
    }

    if($statistics_enabled) {
        $output .= '<script type="text/javascript" src="' . WP_RP_STATIC_BASE_URL . WP_RP_STATIC_CTR_PAGEVIEW_FILE . '?version=' . WP_RP_VERSION . '" async></script>' . "\n";
    }

    if ($options['enable_themes']) {
        if ($options["display_thumbnail"]) {
            $theme_url = WP_RP_STATIC_BASE_URL . WP_RP_STATIC_THEMES_THUMBS_PATH;
        } else {
            $theme_url = WP_RP_STATIC_BASE_URL . WP_RP_STATIC_THEMES_PATH;
        }

        $output .= '<link rel="stylesheet" href="' . $theme_url . $options['theme_name'] . '?version=' . WP_RP_VERSION . '" />' . "\n";
        if ($options['custom_theme_enabled']) {
            $output .= '<style type="text/css">' . "\n" . $options['theme_custom_css'] . "</style>\n";
        }
    }

    echo $output;
}

function wp_rp_get_related_posts($before_title = '', $after_title = '') {
    if (wp_rp_should_exclude()) {
        return;
    }

    $options = wp_rp_get_options();
    $meta = wp_rp_get_meta();

    $statistics_enabled = $options['ctr_dashboard_enabled'] && $meta['blog_id'] && $meta['auth_key'];
    $remote_recommendations = is_single() && $meta['remote_recommendations'] && $statistics_enabled;

    $output = "";
    $promotional_link = '';

    $posts_and_title = wp_rp_fetch_posts_and_title();

    $related_posts = $posts_and_title['posts'];
    $title = $posts_and_title['title'];

    if (!$related_posts) {
        return;
    }

    $css_classes = 'related_post wp_rp';
    if ($options['enable_themes']) {
        $css_classes .= ' ' . str_replace(array('.css', '-'), array('', '_'), esc_attr('wp_rp_' . $options['theme_name']));
    }

    $output = wp_rp_generate_related_posts_list_items($related_posts);
    $output = '<ul class="' . $css_classes . '" style="visibility: ' . ($remote_recommendations ? 'hidden' : 'visible') . '">' . $output . '</ul>';
    if($remote_recommendations) {
        $output = $output . '<script type="text/javascript">window._wp_rp_callback_widget_exists && window._wp_rp_callback_widget_exists();</script>';
    }

    if ($title != '') {
        if ($before_title) {
            $output = $before_title . $title . $after_title . $output;
        } else {
            $title_tag = $options["related_posts_title_tag"];
            $output =  '<' . $title_tag . ' class="related_post_title">' . $title . $promotional_link . '</' . $title_tag . '>' . $output;
        }
    }

    return "\n" . $output . "\n";
}