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<?php |
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/** |
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* User Content Link Redirection |
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* |
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* The purpose of this file is to track and redirect user content links in emails. |
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* This renders an iframe pointing to subscribe.wordpress.com which will track and |
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* return the destination url for the iframe parent to redirect to. |
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* |
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* @package automattic/jetpack |
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*/ |
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|
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use Automattic\Jetpack\Connection\Manager as Connection_Manager; |
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|
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/** |
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* Render a page with an iframe to track and redirect user content links in emails. |
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* |
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* Hooked to the `init` action, this function renders a page with an iframe pointing to |
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* subscribe.wordpress.com to track and return the destination URL for redirection. |
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* |
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* Redirects to the site's home page if required parameters are missing. |
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* Returns a 400 error if the request's `blog_id` doesn't match the actual `blog_id`. |
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* |
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* @return never |
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*/ |
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function jetpack_user_content_link_redirection() { |
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended |
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if ( empty( $_SERVER['QUERY_STRING'] ) || empty( $_SERVER['HTTP_HOST'] ) || empty( $_GET['blog_id'] ) ) { |
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wp_safe_redirect( get_home_url() ); |
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exit( 0 ); |
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} |
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|
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended |
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$request_blog_id = intval( sanitize_text_field( wp_unslash( $_GET['blog_id'] ) ) ); |
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$actual_blog_id = Connection_Manager::get_site_id( true ); |
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|
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if ( $actual_blog_id !== $request_blog_id ) { |
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wp_die( esc_html__( 'Invalid link.', 'jetpack' ), 400 ); |
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exit( 0 ); |
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} |
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|
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$query_params = sanitize_text_field( wp_unslash( $_SERVER['QUERY_STRING'] ) ); |
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$iframe_url = "https://subscribe.wordpress.com/?$query_params"; |
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|
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echo <<<'EOF' |
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<!DOCTYPE html> |
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<html> |
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<head> |
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<script> |
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let messageReceived = false; |
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window.addEventListener( 'message', function(event) { |
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if ( event.origin !== 'https://subscribe.wordpress.com' || messageReceived ) { |
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return; |
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} |
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if ( event.data.redirectUrl ) { |
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messageReceived = true; |
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window.location.href = event.data.redirectUrl; |
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} |
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} ); |
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</script> |
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</head> |
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<body> |
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EOF; |
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echo '<iframe id="user-content-link-redirection" hidden aria-hidden="true" tabindex="-1" width="0" height="0" style="display: none" src="' . esc_url( $iframe_url ) . '"></iframe>'; |
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echo <<<'EOF' |
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</body> |
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</html> |
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EOF; |
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exit( 0 ); |
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} |
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|
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// The WPCOM_USER_CONTENT_LINK_REDIRECTION flag prevents this redirection logic from running |
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// on Atomic in case we'd like to override the redirection logic on the Atomic end. |
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|
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended |
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if ( ! defined( 'WPCOM_USER_CONTENT_LINK_REDIRECTION' ) && isset( $_GET['action'] ) && $_GET['action'] === 'user_content_redirect' ) { |
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add_action( 'init', 'jetpack_user_content_link_redirection' ); |
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} |
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|
