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Editing: class-amp-form-sanitizer.php

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<?php
/**
 * Class AMP_Form_Sanitizer.
 *
 * @package AMP
 * @since 0.7
 */

use AmpProject\AmpWP\ValidationExemption;
use AmpProject\DevMode;
use AmpProject\Dom\Document\Filter\MustacheScriptTemplates;
use AmpProject\Dom\Element;
use AmpProject\Html\Attribute;

/**
 * Class AMP_Form_Sanitizer
 *
 * Strips and corrects attributes in forms.
 *
 * @since 0.7
 * @internal
 */
class AMP_Form_Sanitizer extends AMP_Base_Sanitizer {

/**
	 * Validation error code emitted when there is a POST form with action-xhr but only native POST forms are used.
	 *
	 * @var string
	 */
	const POST_FORM_HAS_ACTION_XHR_WHEN_NATIVE_USED = 'POST_FORM_HAS_ACTION_XHR_WHEN_NATIVE_USED';

/**
	 * Placeholder for default args, to be set in child classes.
	 *
	 * @var array
	 */
	protected $DEFAULT_ARGS = [
		'native_post_forms_allowed' => 'never',
	];

/**
	 * Array of flags used to control sanitization.
	 *
	 * @var array {
	 *      @type string $native_post_forms_allowed Whether to convert POST forms to use action-xhr instead. Can be 'never', 'always', or 'conditionally' (if more than comments form).
	 * }
	 */
	protected $args;

/**
	 * Tag.
	 *
	 * @var string HTML <form> tag to identify and process.
	 *
	 * @since 0.7
	 */
	public static $tag = 'form';

/**
	 * Sanitize the <form> elements from the HTML contained in this instance's Dom\Document.
	 *
	 * @link https://www.ampproject.org/docs/reference/components/amp-form
	 * @since 0.7
	 */
	public function sanitize() {
		$form_elements = $this->dom->getElementsByTagName( self::$tag );
		if ( 0 === $form_elements->length ) {
			return;
		}

/** @var Element[] $post_form_elements */
		$post_form_elements = [];

foreach ( $form_elements as $form_element ) {
			if ( ! $form_element instanceof Element || DevMode::hasExemptionForNode( $form_element ) ) {
				continue;
			}

// Normalize the method.
			$method = 'get';
			if ( $form_element->getAttribute( Attribute::METHOD ) ) {
				$method = strtolower( $form_element->getAttribute( Attribute::METHOD ) );
			} else {
				$form_element->setAttribute( Attribute::METHOD, $method );
			}

if ( 'get' === $method ) {
				$this->normalize_action_attribute( $form_element );
				$this->normalize_target_attribute( $form_element );
			} elseif ( 'post' === $method ) {
				$post_form_elements[] = $form_element;
			}
		}

// Convert post forms to use action-xhr if post forms are never allowed or if native forms are conditionally
		// allowed but the only form is the comments form which we are able to safely convert to use action-xhr.
		if (
			'never' === $this->args['native_post_forms_allowed']
			||
			(
				'conditionally' === $this->args['native_post_forms_allowed']
				&&
				count( $post_form_elements ) === 1
				&&
				$this->is_comments_form_element( $post_form_elements[0] )
			)
		) {
			foreach ( $post_form_elements as $post_form_element ) {
				$this->normalize_target_attribute( $post_form_element );
				$this->convert_post_form_to_action_xhr( $post_form_element );
			}
		} else {
			foreach ( $post_form_elements as $post_form_element ) {
				$this->handle_native_post_form( $post_form_element );
			}
		}
	}

/**
	 * Convert post form to use action-xhr.
	 *
	 * @param Element $post_form_element Post form.
	 */
	protected function convert_post_form_to_action_xhr( Element $post_form_element ) {
		$action_url = $this->normalize_action_attribute( $post_form_element );
		$action_xhr = $post_form_element->getAttribute( Attribute::ACTION_XHR );

$post_form_element->removeAttribute( Attribute::ACTION );
		if ( ! $action_xhr ) {
			// Record that action was converted to action-xhr.
			$action_url = add_query_arg( AMP_HTTP::ACTION_XHR_CONVERTED_QUERY_VAR, 1, $action_url );
			$post_form_element->setAttribute( Attribute::ACTION_XHR, $action_url );
			// Append success/error handlers if not found.
			$this->ensure_response_message_elements( $post_form_element );
		} elseif ( 'http://' === substr( $action_xhr, 0, 7 ) ) {
			$post_form_element->setAttribute( Attribute::ACTION_XHR, substr( $action_xhr, 5 ) );
		}
	}

/**
	 * Handle native post form.
	 *
	 * If native post forms are used, then mark any POST forms as being unvalidated for AMP. Note that it is
	 * an all or nothing proposition with forms, where there cannot be some POST forms with [action] and
	 * others with [action-xhr]. The former is incompatible with the amp-form extension but the latter
	 * fundamentally depends on it. So it's one or the other.
	 *
	 * @param Element $post_form_element Post form.
	 */
	protected function handle_native_post_form( Element $post_form_element ) {
		if ( $post_form_element->hasAttribute( Attribute::ACTION_XHR ) ) {
			// @todo Consider rewriting action-xhr to action? Or include a shim which implements the amp-form functionality?
			$this->remove_invalid_child(
				$post_form_element,
				[ 'code' => self::POST_FORM_HAS_ACTION_XHR_WHEN_NATIVE_USED ]
			);
		} else {
			ValidationExemption::mark_node_as_px_verified( $post_form_element );
		}
	}

/**
	 * Normalize form target attribute.
	 *
	 * The target "indicates where to display the form response after submitting the form.
	 * The value must be _blank or _top". The _self and _parent values are treated
	 * as synonymous with _top, and anything else is treated like _blank.
	 *
	 * @param Element $form_element Form element.
	 */
	protected function normalize_target_attribute( Element $form_element ) {
		$target = $form_element->getAttribute( Attribute::TARGET );
		if ( '_top' !== $target ) {
			if ( ! $target || in_array( $target, [ '_self', '_parent' ], true ) ) {
				$form_element->setAttribute( Attribute::TARGET, '_top' );
			} elseif ( '_blank' !== $target ) {
				$form_element->setAttribute( Attribute::TARGET, '_blank' );
			}
		}
	}

/**
	 * Normalize form action attribute.
	 *
	 * @param Element $form_element Form element.
	 * @return string Normalized action URL.
	 */
	protected function normalize_action_attribute( Element $form_element ) {
		$action_url = $this->get_action_url( $form_element->getAttribute( Attribute::ACTION ) );
		$form_element->setAttribute( Attribute::ACTION, $action_url );
		return $action_url;
	}

/**
	 * Determine whether the form is for the comments.
	 *
	 * @param Element $form_element Form element.
	 * @return bool Is comments form.
	 */
	protected function is_comments_form_element( Element $form_element ) {
		return (
			'commentform' === $form_element->getAttribute( Attribute::ID )
			&&
			'wp-comments-post.php' === basename( wp_parse_url( $form_element->getAttribute( Attribute::ACTION ), PHP_URL_PATH ) )
		);
	}

/**
	 * Get the action URL for the form element.
	 *
	 * @see amp_get_current_url()
	 * @see AMP_HTTP::intercept_post_request_redirect()
	 * @param string $action_url Action URL.
	 * @return string Action URL.
	 */
	protected function get_action_url( $action_url ) {
		$parsed_home_url = wp_parse_url( home_url() );

/*
		 * In HTML, the default action is just the current URL that the page is served from.
		 * The action "specifies a server endpoint to handle the form input. The value must be an
		 * https URL and must not be a link to a CDN".
		 */
		if ( ! $action_url ) {
			$action_url = '//' . $parsed_home_url['host'];
			if ( isset( $parsed_home_url['port'] ) ) {
				$action_url .= ':' . $parsed_home_url['port'];
			}
			if ( isset( $_SERVER['REQUEST_URI'] ) ) {
				// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Sanitization is done below.
				$action_url .= wp_unslash( $_SERVER['REQUEST_URI'] );
			}

return esc_url_raw( $action_url );
		}

$parsed_url = wp_parse_url( $action_url );

if (
			// Ignore a malformed URL - it will be later sanitized.
			false === $parsed_url
			||
			// Ignore HTTPS URLs, because there is nothing left to do.
			( isset( $parsed_url['scheme'] ) && 'https' === $parsed_url['scheme'] )
			||
			// Ignore protocol-relative URLs, because there is also nothing left to do.
			( ! isset( $parsed_url['scheme'] ) && isset( $parsed_url['host'] ) )
		) {
			return $action_url;
		}

// Make URL protocol relative.
		$parsed_url['scheme'] = '//';

// Set an empty path if none is defined but there is a host.
		if ( ! isset( $parsed_url['path'] ) && isset( $parsed_url['host'] ) ) {
			$parsed_url['path'] = '';
		}

if ( ! isset( $parsed_url['host'] ) ) {
			$parsed_url['host'] = $parsed_home_url['host'];
		}

if ( ! isset( $parsed_url['port'] ) && isset( $parsed_home_url['port'] ) ) {
			$parsed_url['port'] = $parsed_home_url['port'];
		}

if ( ! isset( $parsed_url['path'] ) ) {
			// If there is action URL path, use the one from the request.
			// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.InputNotValidated
			$parsed_url['path'] = trailingslashit( wp_unslash( $_SERVER['REQUEST_URI'] ) );
		} elseif ( '' !== $parsed_url['path'] && '/' !== $parsed_url['path'][0] ) {
			// If the path is relative, append it to the current request path.
			// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.InputNotValidated
			$parsed_url['path'] = trailingslashit( wp_unslash( $_SERVER['REQUEST_URI'] ) ) . trailingslashit( $parsed_url['path'] );
		}

// Rebuild the URL.
		$action_url = $parsed_url['scheme'];
		if ( isset( $parsed_url['user'] ) ) {
			$action_url .= $parsed_url['user'];
			if ( isset( $parsed_url['pass'] ) ) {
				$action_url .= ':' . $parsed_url['pass'];
			}
			$action_url .= '@';
		}
		$action_url .= $parsed_url['host'];
		if ( isset( $parsed_url['port'] ) ) {
			$action_url .= ':' . $parsed_url['port'];
		}
		$action_url .= $parsed_url['path'];
		if ( isset( $parsed_url['query'] ) ) {
			$action_url .= '?' . $parsed_url['query'];
		}
		if ( isset( $parsed_url['fragment'] ) ) {
			$action_url .= '#' . $parsed_url['fragment'];
		}

return esc_url_raw( $action_url );
	}

/**
	 * Ensure that the form has a submit-success and submit-error element templates.
	 *
	 * @link https://www.ampproject.org/docs/reference/components/amp-form#success/error-response-rendering
	 * @since 1.2
	 *
	 * @param DOMElement $form The form node to check.
	 */
	public function ensure_response_message_elements( $form ) {
		$elements = [
			'submit-error'   => null,
			'submit-success' => null,
			'submitting'     => null,
		];

$templates = $this->dom->xpath->query( MustacheScriptTemplates::XPATH_MUSTACHE_TEMPLATE_ELEMENTS_QUERY, $form );
		foreach ( $templates as $template ) {
			$parent = $template->parentNode;
			if ( $parent instanceof DOMElement ) {
				foreach ( array_keys( $elements ) as $attribute ) {
					if ( $parent->hasAttribute( $attribute ) ) {
						$elements[ $attribute ] = $parent;
					}
				}
			}
		}

foreach ( $elements as $attribute => $element ) {
			if ( $element ) {
				continue;
			}
			$div      = $this->dom->createElement( 'div' );
			$template = $this->dom->createElement( 'template' );
			$div->setAttribute( 'class', 'amp-wp-default-form-message' );
			if ( 'submitting' === $attribute ) {
				$p = $this->dom->createElement( 'p' );
				$p->appendChild( $this->dom->createTextNode( __( 'Submitting…', 'amp' ) ) );
				$template->appendChild( $p );
			} else {
				$p = $this->dom->createElement( 'p' );
				$p->setAttribute( 'class', '{{#redirecting}}amp-wp-form-redirecting{{/redirecting}}' );
				// phpcs:ignore WordPressVIPMinimum.Security.Mustache.OutputNotation -- Sanitization applied via amp-mustache.
				$p->appendChild( $this->dom->createTextNode( '{{#message}}{{{message}}}{{/message}}' ) );

// Show generic message for HTTP success/failure.
				$p->appendChild( $this->dom->createTextNode( '{{^message}}' ) );
				if ( 'submit-error' === $attribute ) {
					$p->appendChild( $this->dom->createTextNode( __( 'Your submission failed.', 'amp' ) ) );
					/* translators: %1$s: HTTP status text, %2$s: HTTP status code */
					$reason = sprintf( __( 'The server responded with %1$s (code %2$s).', 'amp' ), '{{status_text}}', '{{status_code}}' );
				} else {
					$p->appendChild( $this->dom->createTextNode( __( 'It appears your submission was successful.', 'amp' ) ) );
					$reason = __( 'Even though the server responded OK, it is possible the submission was not processed.', 'amp' );
				}
				$reason .= ' ' . __( 'Please contact the developer of this form processor to improve this message.', 'amp' );

$p->appendChild( $this->dom->createTextNode( ' ' ) );
				$small = $this->dom->createElement( 'small' );
				$small->appendChild( $this->dom->createTextNode( $reason ) );
				$small->appendChild( $this->dom->createTextNode( ' ' ) );
				$link = $this->dom->createElement( 'a' );
				$link->setAttribute( 'href', 'https://amp-wp.org/?p=5463' );
				$link->setAttribute( 'target', '_blank' );
				$link->setAttribute( 'rel', 'nofollow noreferrer noopener' );
				$link->appendChild( $this->dom->createTextNode( __( 'Learn More', 'amp' ) ) );
				$small->appendChild( $link );
				$p->appendChild( $small );

$p->appendChild( $this->dom->createTextNode( '{{/message}}' ) );
				$template->appendChild( $p );
			}
			$div->setAttribute( $attribute, '' );
			$template->setAttribute( 'type', 'amp-mustache' );
			$div->appendChild( $template );
			$form->appendChild( $div );
		}
	}
}

Editing: class-amp-form-sanitizer.php

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