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<?php /** * Class Output_Buffer * * @link https://github.com/googleforcreators/web-stories-wp * * @copyright 2021 Google LLC * @license https://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0 */ /** * Copyright 2021 Google LLC * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * https://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ declare(strict_types = 1); namespace Google\Web_Stories\AMP; use Google\Web_Stories\Context; use Google\Web_Stories\Exception\SanitizationException; use Google\Web_Stories\Infrastructure\Conditional; use Google\Web_Stories\Service_Base; use Google\Web_Stories_Dependencies\AmpProject\Dom\Document; use Throwable; /** * Output buffer class. * * Largely copied from AMP_Theme_Support. * * @since 1.10.0 * * @see \AMP_Theme_Support */ class Output_Buffer extends Service_Base implements Conditional { /** * Whether output buffering has started. */ protected bool $is_output_buffering = false; /** * Sanitization instance. * * @var Sanitization Sanitization instance. */ private Sanitization $sanitization; /** * Optimization instance. * * @var Optimization Optimization instance. */ private Optimization $optimization; /** * Context instance. * * @var Context Context instance. */ private Context $context; /** * Output_Buffer constructor. * * @since 1.10.0 * * @param Sanitization $sanitization Sanitization instance. * @param Optimization $optimization Optimization instance. * @param Context $context Context instance. */ public function __construct( Sanitization $sanitization, Optimization $optimization, Context $context ) { $this->sanitization = $sanitization; $this->optimization = $optimization; $this->context = $context; } /** * Runs on instantiation. * * @since 1.10.0 */ public function register(): void { /* * Start output buffering at very low priority for sake of plugins and themes that use template_redirect * instead of template_include. */ $this->start_output_buffering(); } /** * Get the action to use for registering the service. * * @since 1.10.0 * * @return string Registration action to use. */ public static function get_registration_action(): string { return 'template_redirect'; } /** * Get the action priority to use for registering the service. * * @since 1.10.0 * * @return int Registration action priority to use. */ public static function get_registration_action_priority(): int { return PHP_INT_MIN; } /** * Check whether the conditional object is currently needed. * * If the AMP plugin is installed and available in a version >= than ours, * all sanitization and optimization should be delegated to the AMP plugin. * But ONLY if AMP logic has not been disabled through any of its available filters. * * @since 1.10.0 * * @return bool Whether the conditional object is needed. */ public static function is_needed(): bool { $current_post = get_post(); $has_old_amp_version = ! \defined( '\AMP__VERSION' ) || ( \defined( '\AMP__VERSION' ) && version_compare( \AMP__VERSION, WEBSTORIES_AMP_VERSION, '<' ) ); $amp_available = \function_exists( 'amp_is_available' ) && amp_is_available(); $amp_enabled = \function_exists( 'amp_is_enabled' ) && amp_is_enabled(); // Technically an internal method. $amp_initialized = did_action( 'amp_init' ) > 0; $amp_supported_post = \function_exists( 'amp_is_post_supported' ) && amp_is_post_supported( $current_post->ID ?? 0 ); return $has_old_amp_version || ! $amp_available || ! $amp_enabled || ! $amp_initialized || ! $amp_supported_post; } /** * Start output buffering. * * @since 1.10.0 * * @see Output_Buffer::finish_output_buffering() */ public function start_output_buffering(): void { if ( ! $this->context->is_web_story() ) { return; } ob_start( [ $this, 'finish_output_buffering' ] ); $this->is_output_buffering = true; } /** * Determine whether output buffering has started. * * @since 1.10.0 * * @see Output_Buffer::start_output_buffering() * @see Output_Buffer::finish_output_buffering() * * @return bool Whether output buffering has started. */ public function is_output_buffering(): bool { return $this->is_output_buffering; } /** * Finish output buffering. * * @since 1.10.0 * * @see Output_Buffer::start_output_buffering() * * @param string $response Buffered Response. * @return string Processed Response. */ public function finish_output_buffering( string $response ): string { $this->is_output_buffering = false; try { $response = $this->prepare_response( $response ); } catch ( \Error $error ) { // Only PHP 7+. $response = $this->render_error_page( $error ); } catch ( \Exception $exception ) { $response = $this->render_error_page( $exception ); } return $response; } /** * Process response to ensure AMP validity. * * @since 1.10.0 * * @param string $response HTML document response. By default it expects a complete document. * @return string AMP document response. */ public function prepare_response( string $response ): string { // Enforce UTF-8 encoding as it is a requirement for AMP. if ( ! headers_sent() ) { header( 'Content-Type: text/html; charset=utf-8' ); } $dom = Document::fromHtml( $response ); if ( ! $dom instanceof Document ) { return $this->render_error_page( SanitizationException::from_document_parse_error() ); } $this->sanitization->sanitize_document( $dom ); $this->optimization->optimize_document( $dom ); return $dom->saveHTML(); } /** * Render error page. * * @since 1.10.0 * * @param Throwable $throwable Exception or (as of PHP7) Error. * @return string Error page. */ private function render_error_page( Throwable $throwable ): string { return esc_html__( 'There was an error generating the web story, probably because of a server misconfiguration. Try contacting your hosting provider or open a new support request.', 'web-stories' ) . "\n" . "\n" . // translators: 1: error message. 2: location. sprintf( esc_html__( 'Error message: %1$s (%2$s)', 'web-stories' ), $throwable->getMessage(), $throwable->getFile() . ':' . $throwable->getLine() ); } }
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