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<?php

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namespace Smush\Core\Transform;

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use Smush\Core\Array_Utils;

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use Smush\Core\Parser\Page_Parser;

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use Smush\Core\Parser\Parser;

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use Smush\Core\Settings;

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class Transformer {

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/**

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* @var Array_Utils

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private $array_utils;

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/**

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* @var Transform[]

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private $transforms;

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/**

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* @var Parser

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private $parser;

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/**

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* @var Settings|null

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private $settings;

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public function __construct() {

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$this->array_utils = new Array_Utils();

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$this->parser = new Parser();

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$this->settings = Settings::get_instance();

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}

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public function transform_content( $page_markup, $page_url ) {

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if ( empty( $page_markup ) || ! is_string( $page_markup ) ) {

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return $page_markup;

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}

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$transforms = $this->get_transforms();

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if ( empty( $transforms ) ) {

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// Nothing to do

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return $page_markup;

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}

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foreach ( $transforms as $transform ) {

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$page_markup = $this->apply_transform_to_content( $transform, $page_markup, $page_url );

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}

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return $page_markup;

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}

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private function apply_transform_to_content( $transform, $page_markup, $page_url ) {

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$parser = new Page_Parser( $page_url, $page_markup );

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$parsed_page = $parser->parse_page();

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$transform->transform_page( $parsed_page );

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return $parsed_page->has_updates()

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? $parsed_page->get_updated_markup()

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: $parsed_page->get_page_markup();

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}

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/**

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* @param $response array

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* @param $request \WP_REST_Request

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* @return array The $response with content replaced.

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public function transform_rest_response( $response, $request ) {

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if ( empty( $this->get_transforms() ) ) {

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return $response;

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}

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if ( wp_is_numeric_array( $response ) ) {

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foreach ( $response as $index => $item ) {

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$response[ $index ] = $this->transform_single_rest_item( $item, $request );

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}

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} else {

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$response = $this->transform_single_rest_item( $response, $request );

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}

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return apply_filters( 'wp_smush_transform_rest_response', $response, $request, $this );

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}

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private function transform_single_rest_item( $item, $request ) {

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if (

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$request->get_method() === 'GET'

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&& str_starts_with( $request->get_route(), '/wp/v2/media' )

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) {

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return $this->transform_rest_media_response( $item );

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}

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$item = $this->transform_rest_content_fields( $item );

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return apply_filters( 'wp_smush_transform_rest_response_item', $item, $request, $this );

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}

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/**

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* @param array $response

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* @return array

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private function transform_rest_content_fields( $response ) {

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if ( ! $this->is_array_post_like( $response ) ) {

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return $response;

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}

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foreach ( $this->get_rest_content_fields() as $rest_content_field ) {

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$response = $this->transform_rest_content_field( $rest_content_field, $response );

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}

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return $response;

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}

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private function transform_rest_content_field( $field, $response ) {

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if ( empty( $response[ $field ] ) ) {

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return $response;

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}

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$keys = array( $field );

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$value = $response[ $field ];

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if ( isset( $value['rendered'] ) ) {

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$value = $value['rendered'];

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$keys[] = 'rendered';

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}

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if ( ! is_string( $value ) ) {

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return $response;

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}

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$link = empty( $response['link'] ) ? '' : $response['link'];

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$this->array_utils->put_array_value(

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$response,

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$this->transform_content( $value, $link ),

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$keys

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);

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return $response;

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}

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private function get_rest_content_fields() {

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$fields = apply_filters( 'wp_smush_rest_content_fields', array( 'excerpt', 'content' ) );

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return array_unique( $fields );

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}

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private function is_array_post_like( $array ) {

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return is_array( $array )

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&& isset( $array['id'] )

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&& isset( $array['title'] )

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&& isset( $array['slug'] );

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}

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private function transform_rest_media_response( $response ) {

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$sizes = $this->array_utils->get_array_value( $response, array( 'media_details', 'sizes' ) );

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if ( ! empty( $sizes ) ) {

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foreach ( $sizes as $size_key => $size ) {

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if ( ! empty( $size['source_url'] ) ) {

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$response['media_details']['sizes'][ $size_key ]['source_url'] = $this->transform_url( $size['source_url'] );

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}

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}

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}

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if ( ! empty( $response['source_url'] ) ) {

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$response['source_url'] = $this->transform_url( $response['source_url'] );

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}

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return $this->transform_rest_content_field( 'description', $response );

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}

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public function transform_url( $url ) {

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foreach ( $this->get_transforms() as $transform ) {

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$url = $transform->transform_image_url( $url );

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}

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return $url;

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}

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/**

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* @return Transform[]

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public function get_transforms() {

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if ( is_null( $this->transforms ) ) {

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$this->transforms = $this->prepare_transforms();

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}

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return $this->transforms;

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}

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private function prepare_transforms() {

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$transforms = $this->array_utils->ensure_array( apply_filters( 'wp_smush_content_transforms', array() ) );

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$filtered = array();

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foreach ( $transforms as $key => $transform ) {

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if ( is_a( $transform, '\Smush\Core\Transform\Transform' ) && $transform->should_transform() ) {

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$filtered[ $key ] = $transform;

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}

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}

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return $filtered;

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}

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}

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