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<?php

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namespace Smush\Core\Webp;

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class Webp_Nginx {

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/**

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* Code to use on Nginx servers.

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* @param bool $marker whether to wrap code with marker comment lines.

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* @return string

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public function get_rewrite_rules( $marker = true ) {

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$webp_dir = new Webp_Dir();

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$upload_relpath = $webp_dir->get_upload_rel_path();

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$webp_path = trailingslashit( $webp_dir->get_webp_path() );

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$webp_rel_path = trailingslashit( $webp_dir->get_webp_rel_path() );

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$base = trailingslashit( dirname( $upload_relpath ) );

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$directory = trailingslashit( basename( $upload_relpath ) );

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$regex_base = ltrim( $base, '/\\' ) . '(' . $directory . ')';

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$regex_base = str_replace( '/', '\/', $regex_base );

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/**

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* We often need to remove WebP file extension from Nginx cache rule in order to make Smush WebP work,

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* so always add expiry header rule for Nginx.

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* @since 3.9.8

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* @see https://incsub.atlassian.net/browse/SMUSH-1072

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$code = <<<WEBP_RULES

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location ~* "{$regex_base}(.*\.(?:png|jpe?g))" {

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add_header Vary Accept;

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set \$image_path \$2;

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if (-f "{$webp_path}disable_smush_webp") {

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break;

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}

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if (\$http_accept !~* "webp") {

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break;

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}

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expires max;

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try_files {$webp_rel_path}\$image_path.webp \$uri =404;

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}

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WEBP_RULES;

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if ( true === $marker ) {

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$code = "# BEGIN SMUSH-WEBP\n" . $code;

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$code .= "\n# END SMUSH-WEBP";

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}

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return apply_filters( 'smush_nginx_webp_rules', $code );

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}

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}

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