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<?php |
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abstract class AMP_Base_Sanitizer { |
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const FALLBACK_HEIGHT = 400; |
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protected $DEFAULT_ARGS = array(); |
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protected $dom; |
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protected $args; |
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protected $did_convert_elements = false; |
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public function __construct( $dom, $args = array() ) { |
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$this->dom = $dom; |
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$this->args = array_merge( $this->DEFAULT_ARGS, $args ); |
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} |
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abstract public function sanitize(); |
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public function get_scripts() { |
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return array(); |
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} |
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public function get_styles() { |
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return array(); |
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} |
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protected function get_body_node() { |
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return $this->dom->getElementsByTagName( 'body' )->item( 0 ); |
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} |
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public function sanitize_dimension( $value, $dimension ) { |
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if ( empty( $value ) ) { |
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return $value; |
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} |
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if ( false !== filter_var( $value, FILTER_VALIDATE_INT ) ) { |
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return absint( $value ); |
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} |
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if ( AMP_String_Utils::endswith( $value, 'px' ) ) { |
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return absint( $value ); |
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} |
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if ( AMP_String_Utils::endswith( $value, '%' ) ) { |
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if ( 'width' === $dimension && isset( $this->args[ 'content_max_width'] ) ) { |
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$percentage = absint( $value ) / 100; |
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return round( $percentage * $this->args[ 'content_max_width'] ); |
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} |
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} |
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return ''; |
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} |
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public function enforce_fixed_height( $attributes ) { |
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if ( empty( $attributes['height'] ) ) { |
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unset( $attributes['width'] ); |
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$attributes['height'] = self::FALLBACK_HEIGHT; |
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} |
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if ( empty( $attributes['width'] ) ) { |
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$attributes['layout'] = 'fixed-height'; |
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} |
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return $attributes; |
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} |
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/** |
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* This is our workaround to enforce max sizing with layout=responsive. |
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* |
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* We want elements to not grow beyond their width and shrink to fill the screen on viewports smaller than their width. |
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* |
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* See https://github.com/ampproject/amphtml/issues/1280#issuecomment-171533526 |
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* See https://github.com/Automattic/amp-wp/issues/101 |
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*/ |
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public function enforce_sizes_attribute( $attributes ) { |
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if ( ! isset( $attributes['width'], $attributes['height'] ) ) { |
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return $attributes; |
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} |
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$max_width = $attributes['width']; |
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if ( isset( $this->args['content_max_width'] ) && $max_width >= $this->args['content_max_width'] ) { |
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$max_width = $this->args['content_max_width']; |
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} |
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$attributes['sizes'] = sprintf( '(min-width: %1$dpx) %1$dpx, 100vw', absint( $max_width ) ); |
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$this->add_or_append_attribute( $attributes, 'class', 'amp-wp-enforced-sizes' ); |
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return $attributes; |
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} |
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public function add_or_append_attribute( &$attributes, $key, $value, $separator = ' ' ) { |
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if ( isset( $attributes[ $key ] ) ) { |
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$attributes[ $key ] .= $separator . $value; |
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} else { |
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$attributes[ $key ] = $value; |
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} |
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} |
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/** |
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* Decide if we should remove a src attribute if https is required. |
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* If not required, the implementing class may want to try and force https instead. |
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* |
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* @param string $src |
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* @param boolean $force_https |
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* @return string |
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*/ |
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public function maybe_enforce_https_src( $src, $force_https = false ) { |
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$protocol = strtok( $src, ':' ); |
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if ( 'https' !== $protocol ) { |
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// Check if https is required |
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if ( isset( $this->args['require_https_src'] ) && true === $this->args['require_https_src'] ) { |
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// Remove the src. Let the implementing class decide what do from here. |
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$src = ''; |
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} elseif ( ( ! isset( $this->args['require_https_src'] ) || false === $this->args['require_https_src'] ) |
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&& true === $force_https ) { |
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// Don't remove the src, but force https instead |
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$src = set_url_scheme( $src, 'https' ); |
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} |
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} |
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return $src; |
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} |
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} |
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Automattic /
jetpack
