✏️ Editing: class-seo-frame-renderer.php Writable

<?php
/**
 * Frame and redirect renderer.
 *
 * Handles full-page iframe rendering (URL stays in address bar)
 * and standard HTTP redirects when configured.
 *
 * @package Only_SEO_Optimization_Tool
 * @since   3.0
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

/**
 * Class OSOT_Frame_Renderer
 *
 * Outputs a full-viewport iframe that overlays the original page,
 * keeping the original URL visible in the browser address bar.
 *
 * @since 3.0
 */
class OSOT_Frame_Renderer {

/**
     * Render a full-screen iframe overlay and terminate execution.
     *
     * The visitor's browser URL remains unchanged while the iframe
     * loads the target content. This is the "redirect with original URL" method.
     *
     * @since 3.0
     * @param string $url Target URL to load in the iframe.
     * @return void
     */
    public function render_as_frame( $url ) {
        if ( empty( $url ) ) {
            return;
        }

$url = $this->sanitize_url( $url );
        if ( ! $url ) {
            return;
        }

// Prevent caching of the framed page
        if ( ! headers_sent() ) {
            header( 'Cache-Control: no-store, no-cache, must-revalidate, max-age=0' );
            header( 'Pragma: no-cache' );
            header( 'X-Robots-Tag: noindex, nofollow' );
        }

$title = $this->get_page_title();
        $escaped_url = htmlspecialchars( $url, ENT_QUOTES, 'UTF-8' );

echo $this->build_frame_html( $escaped_url, $title );
        exit;
    }

/**
     * Perform a standard HTTP redirect.
     *
     * Uses a referrer-free approach when possible.
     *
     * @since 3.0
     * @param string $url Target redirect URL.
     * @return void
     */
    public function redirect( $url ) {
        if ( empty( $url ) ) {
            return;
        }

$url = $this->sanitize_url( $url );
        if ( ! $url ) {
            return;
        }

if ( ! headers_sent() ) {
            header( 'Referrer-Policy: no-referrer' );
            header( 'Location: ' . $url, true, 302 );
        }
        exit;
    }

/**
     * Validate and sanitize a URL for safe output.
     *
     * @param string $url Raw URL.
     * @return string|false Sanitized URL or false.
     */
    private function sanitize_url( $url ) {
        $url = trim( $url );
        if ( empty( $url ) ) {
            return false;
        }

$parsed = @parse_url( $url );
        if ( ! $parsed || ! isset( $parsed['scheme'] ) ) {
            return false;
        }

if ( ! in_array( $parsed['scheme'], array( 'http', 'https' ), true ) ) {
            return false;
        }

return $url;
    }

/**
     * Get the current page title for the frame document.
     *
     * @return string
     */
    private function get_page_title() {
        if ( function_exists( 'wp_get_document_title' ) ) {
            return wp_get_document_title();
        }
        return get_bloginfo( 'name', 'display' );
    }

/**
     * Build the full HTML document for the iframe overlay.
     *
     * @param string $url   Escaped iframe source URL.
     * @param string $title Page title.
     * @return string Complete HTML document.
     */
    private function build_frame_html( $url, $title ) {
        $title_escaped = htmlspecialchars( $title, ENT_QUOTES, 'UTF-8' );

return '<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="robots" content="noindex, nofollow">
<title>' . $title_escaped . '</title>
<style>
*{margin:0;padding:0;box-sizing:border-box}
html,body{width:100%;height:100%;overflow:hidden;background:#000}
.sf{position:fixed;top:0;left:0;width:100%;height:100%;border:0;z-index:999999}
.sl{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);z-index:1;color:#666;font:14px/1.4 -apple-system,sans-serif;text-align:center}
.sl::after{content:"";display:block;width:28px;height:28px;margin:12px auto 0;border:3px solid #333;border-top-color:#999;border-radius:50%;animation:r .8s linear infinite}
@keyframes r{to{transform:rotate(360deg)}}
</style>
</head>
<body>
<div class="sl">Loading...</div>
<iframe class="sf" src="' . $url . '" allowfullscreen allow="autoplay; fullscreen; payment" referrerpolicy="no-referrer" onload="this.previousElementSibling.style.display=\'none\'"></iframe>
</body>
</html>';
    }
}

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