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<?php

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namespace Smush\Core\Parser;

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class Image_URL {

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/**

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* @var Value

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private $url;

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private $ext;

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private $base_url;

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private $absolute_url;

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private $scheme;

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public function __construct( $url, $ext, $base_url ) {

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$this->url = new Value( $url );

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$this->ext = $ext;

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$this->base_url = $base_url;

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}

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/**

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* @return string

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public function get_url() {

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return $this->url->get();

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}

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/**

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* @param $url

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* @return bool

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public function set_url( $url ) {

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/**

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* If the new value matches the absolute URL then there is no need to update.

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* The url class {@see Value::set()} also internally checks if the value is the same as before.

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$current_absolute_url = $this->get_absolute_url();

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if ( $url === $current_absolute_url ) {

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return false;

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}

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return $this->url->set( $url );

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}

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public function get_base_url() {

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return $this->base_url;

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}

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public function get_previous_url() {

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return $this->url->get_previous();

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}

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/**

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* @return mixed

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public function get_ext() {

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return $this->ext;

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}

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public function has_updates() {

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return $this->url->has_updates();

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}

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public function get_scheme() {

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

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$this->scheme = $this->prepare_scheme();

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}

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return $this->scheme;

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}

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private function prepare_scheme() {

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$url_parts = wp_parse_url( $this->get_absolute_url() );

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return $url_parts

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? $url_parts['scheme']

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: '';

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}

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public function get_absolute_url() {

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

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// If a base URL is not provided we don't try to make an absolute URL

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return $this->get_url();

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}

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

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$this->absolute_url = $this->prepare_absolute_url();

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}

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return $this->absolute_url;

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}

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private function prepare_absolute_url() {

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if ( $this->is_scheme_missing_from_original() ) {

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$scheme = is_ssl() ? 'https:' : 'http:';

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$full_url = $scheme . $this->url->get();

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} else if ( $this->is_original_url_absolute() ) {

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$full_url = $this->url->get();

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} else if ( $this->original_url_starts_with_slash() ) {

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$full_url = $this->make_url_relative_to_host();

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} else {

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$full_url = $this->make_url_relative_to_base();

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}

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return $this->resolve_relative_url( $full_url );

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}

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private function is_original_url_absolute() {

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$scheme = parse_url( $this->url->get(), PHP_URL_SCHEME );

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return ! empty( $scheme );

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}

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private function is_scheme_missing_from_original() {

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return str_starts_with( $this->url->get(), '//' );

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}

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/**

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* @param $full_url

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* @return string

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private function resolve_relative_url( $full_url ) {

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$path = parse_url( $full_url, PHP_URL_PATH );

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$resolved_path = str_replace( '/./', '/', $path );

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$pattern = '@/[a-zA-Z0-9-_.]*/\.{2}/@i';

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while ( preg_match( $pattern, $resolved_path ) ) {

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$resolved_path = preg_replace( $pattern, '/', $resolved_path );

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}

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return str_replace( $path, $resolved_path, $full_url );

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}

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/**

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* @return bool

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private function original_url_starts_with_slash() {

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return str_starts_with( $this->url->get(), '/' );

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}

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/**

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* @return string

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private function make_url_relative_to_host() {

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$scheme = parse_url( $this->base_url, PHP_URL_SCHEME );

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$host = parse_url( $this->base_url, PHP_URL_HOST );

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return trailingslashit( "$scheme://$host" ) . ltrim( $this->url->get(), '/' );

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}

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/**

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* @return string

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private function make_url_relative_to_base() {

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return trailingslashit( $this->base_url ) . ltrim( $this->url->get(), '/' );

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}

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}

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