protected static function normalize_content( $content ) {
        $text = wp_strip_all_tags( (string) $content );
        $text = preg_replace( '/\s+/u', ' ', $text );
        $text = trim( $text );
        if ( function_exists( 'mb_substr' ) ) {
            return mb_substr( $text, 0, 500, 'UTF-8' );
        }
        return substr( $text, 0, 500 );
    }

    protected static function hash( $value ) {
        return md5( (string) $value );
    }
}

/* -------------------------------------------------------------------------
 * Image processor (download, skip SVG, resize, compress)
 * ---------------------------------------------------------------------- */

class NB24_Image_Processor {

    const ALLOWED_MIME = array( 'image/jpeg', 'image/png', 'image/gif', 'image/webp' );
    const MIN_QUALITY  = 30;

    public static function import( $url, $post_title = '' ) {
        $settings = nb24_get_settings();

        $valid = self::validate_url( $url );
        if ( is_wp_error( $valid ) ) {
            return $valid;
        }

        $tmp = download_url( $url, 45 );
        if ( is_wp_error( $tmp ) ) {
            NB24_Error_Logger::error( 'ছবি ডাউনলোড ব্যর্থ: ' . $tmp->get_error_message(), array( 'url' => $url ) );
            return $tmp;
        }
        $tmp_path = $tmp;

        $mime = self::detect_mime( $tmp_path );
        if ( ! in_array( $mime, self::ALLOWED_MIME, true ) ) {
            @unlink( $tmp_path );
            $msg = 'অনুমোদিত নয় এমন ছবি (সম্ভবত SVG) বাদ দেওয়া হয়েছে।';
            NB24_Error_Logger::warning( $msg, array( 'url' => $url, 'mime' => $mime ) );
            return new WP_Error( 'nb24_bad_mime', $msg );
        }

        $target_w = absint( $settings['img_width'] ) ?: 750;
        $target_h = absint( $settings['img_height'] ) ?: 400;
        $max_kb   = absint( $settings['img_max_kb'] ) ?: 40;

        $final_path = self::resize_and_compress( $tmp_path, $mime, $target_w, $target_h, $max_kb );
        if ( is_wp_error( $final_path ) ) {
            @unlink( $tmp_path );
            return $final_path;
        }

        $ext  = self::ext_for_mime( $mime );
        $name = self::build_filename( $post_title, $ext );

        $file_array = array(
            'name'     => $name,
            'tmp_name' => $final_path,
        );

        $attachment_id = media_handle_sideload( $file_array, 0, $post_title );
        if ( file_exists( $tmp_path ) ) {
            @unlink( $tmp_path );
        }
        if ( is_wp_error( $attachment_id ) ) {
            NB24_Error_Logger::error( 'ছবি মিডিয়া লাইব্রেরিতে যোগ ব্যর্থ: ' . $attachment_id->get_error_message(), array( 'url' => $url ) );
            return $attachment_id;
        }

        NB24_Error_Logger::info( 'ছবি ইমপোর্ট সফল', array( 'url' => $url, 'attachment_id' => $attachment_id ) );
        return (int) $attachment_id;
    }

    public static function validate_url( $url ) {
        if ( empty( $url ) || ! filter_var( $url, FILTER_VALIDATE_URL ) ) {
            return new WP_Error( 'nb24_bad_url', 'অবৈধ ছবির URL।' );
        }
        $parts = wp_parse_url( $url );
        if ( empty( $parts['scheme'] ) || ! in_array( strtolower( $parts['scheme'] ), array( 'http', 'https' ), true ) ) {
            return new WP_Error( 'nb24_bad_scheme', 'শুধু http/https ছবি গ্রহণযোগ্য।' );
        }
        if ( empty( $parts['host'] ) ) {
            return new WP_Error( 'nb24_bad_host', 'ছবির হোস্ট পাওয়া যায়নি।' );
        }
        $ip = gethostbyname( $parts['host'] );
        if ( $ip === $parts['host'] ) {
            return new WP_Error( 'nb24_dns_fail', 'ছবির ডোমেইন রিজলভ করা যায়নি।' );
        }
        $is_private = (bool) filter_var( $ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE ) === false;
        if ( $is_private ) {
            return new WP_Error( 'nb24_private_ip', 'অভ্যন্তরীণ/প্রাইভেট ঠিকানার ছবি গ্রহণযোগ্য নয়।' );
        }
        return true;
    }<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
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