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