root/tags/1.3/wp-admin/import/rss.php

<?php

class RSS_Import {

    var $posts = array ();
    var $file;

    function header() {
        echo '<div class="wrap">';
        echo '<h2>'.__('Import RSS').'</h2>';
    }

    function footer() {
        echo '</div>';
    }

    function unhtmlentities($string) { // From php.net for < 4.3 compat
        $trans_tbl = get_html_translation_table(HTML_ENTITIES);
        $trans_tbl = array_flip($trans_tbl);
        return strtr($string, $trans_tbl);
    }

    function greet() {
        echo '<div class="narrow">';
        echo '<p>'.__('Howdy! This importer allows you to extract posts from an RSS 2.0 file into your blog. This is useful if you want to import your posts from a system that is not handled by a custom import tool. Pick an RSS file to upload and click Import.').'</p>';
        wp_import_upload_form("admin.php?import=rss&amp;step=1");
        echo '</div>';
    }

    function get_posts() {
        global $wpdb;

        set_magic_quotes_runtime(0);
        $datalines = file($this->file); // Read the file into an array
        $importdata = implode('', $datalines); // squish it
        $importdata = str_replace(array ("\r\n", "\r"), "\n", $importdata);

        preg_match_all('|<item>(.*?)</item>|is', $importdata, $this->posts);
        $this->posts = $this->posts[1];
        $index = 0;
        foreach ($this->posts as $post) {
            preg_match('|<title>(.*?)</title>|is', $post, $post_title);
            $post_title = str_replace(array('<![CDATA[', ']]>'), '', $wpdb->escape( trim($post_title[1]) ));

            preg_match('|<pubdate>(.*?)</pubdate>|is', $post, $post_date_gmt);

            if ($post_date_gmt) {
                $post_date_gmt = strtotime($post_date_gmt[1]);
            } else {
                // if we don't already have something from pubDate
                preg_match('|<dc:date>(.*?)</dc:date>|is', $post, $post_date_gmt);
                $post_date_gmt = preg_replace('|([-+])([0-9]+):([0-9]+)$|', '\1\2\3', $post_date_gmt[1]);
                $post_date_gmt = str_replace('T', ' ', $post_date_gmt);
                $post_date_gmt = strtotime($post_date_gmt);
            }

            $post_date_gmt = gmdate('Y-m-d H:i:s', $post_date_gmt);
            $post_date = get_date_from_gmt( $post_date_gmt );

            preg_match_all('|<category>(.*?)</category>|is', $post, $categories);
            $categories = $categories[1];

            if (!$categories) {
                preg_match_all('|<dc:subject>(.*?)</dc:subject>|is', $post, $categories);
                $categories = $categories[1];
            }

            $cat_index = 0;
            foreach ($categories as $category) {
                $categories[$cat_index] = $wpdb->escape($this->unhtmlentities($category));
                $cat_index++;
            }

            preg_match('|<guid.+?>(.*?)</guid>|is', $post, $guid);
            if ($guid)
                $guid = $wpdb->escape(trim($guid[1]));
            else
                $guid = '';

            preg_match('|<content:encoded>(.*?)</content:encoded>|is', $post, $post_content);
            $post_content = str_replace(array ('<![CDATA[', ']]>'), '', $wpdb->escape(trim($post_content[1])));

            if (!$post_content) {
                // This is for feeds that put content in description
                preg_match('|<description>(.*?)</description>|is', $post, $post_content);
                $post_content = $wpdb->escape($this->unhtmlentities(trim($post_content[1])));
            }

            // Clean up content
            $post_content = preg_replace('|<(/?[A-Z]+)|e', "'<' . strtolower('$1')", $post_content);
            $post_content = str_replace('<br>', '<br />', $post_content);
            $post_content = str_replace('<hr>', '<hr />', $post_content);

            $post_author = 1;
            $post_status = 'publish';
            $this->posts[$index] = compact('post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_title', 'post_status', 'guid', 'categories');
            $index++;
        }
    }

    function import_posts() {
        echo '<ol>';

        foreach ($this->posts as $post) {
            echo "<li>".__('Importing post...');

            extract($post);

            if ($post_id = post_exists($post_title, $post_content, $post_date)) {
                _e('Post already imported');
            } else {
                $post_id = wp_insert_post($post);
                if ( is_wp_error( $post_id ) )
                    return $post_id;
                if (!$post_id) {
                    _e("Couldn't get post ID");
                    return;
                }

                if (0 != count($categories))
                    wp_create_categories($categories, $post_id);
                _e('Done !');
            }
            echo '</li>';
        }

        echo '</ol>';

    }

    function import() {
        $file = wp_import_handle_upload();
        if ( isset($file['error']) ) {
            echo $file['error'];
            return;
        }

        $this->file = $file['file'];
        $this->get_posts();
        $result = $this->import_posts();
        if ( is_wp_error( $result ) )
            return $result;
        wp_import_cleanup($file['id']);

        echo '<h3>';
        printf(__('All done. <a href="%s">Have fun!</a>'), get_option('home'));
        echo '</h3>';
    }

    function dispatch() {
        if (empty ($_GET['step']))
            $step = 0;
        else
            $step = (int) $_GET['step'];

        $this->header();

        switch ($step) {
            case 0 :
                $this->greet();
                break;
            case 1 :
                check_admin_referer('import-upload');
                $result = $this->import();
                if ( is_wp_error( $result ) )
                    echo $result->get_error_message();
                break;
        }

        $this->footer();
    }

    function RSS_Import() {
        // Nothing.
    }
}

$rss_import = new RSS_Import();

register_importer('rss', __('RSS'), __('Import posts from an RSS feed'), array ($rss_import, 'dispatch'));
?>