| 1 |
<?php |
| 2 |
/** |
| 3 |
* Renders HTML to PDF bytes via the prefixed Dompdf library. |
| 4 |
* |
| 5 |
* Thin wrapper around WCPOS\Vendor\Dompdf\Dompdf. Remote/PHP/JS are disabled for |
| 6 |
* safety; local WordPress/plugin images are embedded as data URIs before Dompdf |
| 7 |
* sees the HTML. Dompdf's writable font cache and temp dir are pointed at a |
| 8 |
* WCPOS-owned subdirectory of the system temp so nothing is written into the |
| 9 |
* read-only, committed vendor_prefixed/ tree. |
| 10 |
* |
| 11 |
* @package WCPOS\WooCommercePOS\Services |
| 12 |
*/ |
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|
| 14 |
namespace WCPOS\WooCommercePOS\Services; |
| 15 |
|
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use WCPOS\Vendor\Dompdf\Dompdf; |
| 17 |
use WCPOS\Vendor\Dompdf\Options; |
| 18 |
|
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/** |
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* Pdf_Renderer class. |
| 21 |
*/ |
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class Pdf_Renderer { |
| 23 |
/** |
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* Tall probe page height used when fitting continuous-roll receipt PDFs. |
| 25 |
*/ |
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private const FIT_HEIGHT_PROBE_PT = 14000.0; |
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|
| 28 |
/** |
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* Bottom breathing room added to the fitted receipt PDF page. |
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*/ |
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private const FIT_HEIGHT_MARGIN_PT = 12.0; |
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|
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/** |
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* Binary-search render passes for the smallest single-page height. |
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*/ |
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private const FIT_HEIGHT_SEARCH_STEPS = 18; |
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|
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/** |
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* Render an HTML document to PDF bytes. |
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* |
| 41 |
* @param string $html HTML document to render. |
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* @param array $opts Optional: 'paper' (size name or [x0,y0,x1,y1]), 'orientation' |
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* ('portrait'|'landscape'), 'default_font', 'fit_height', |
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* 'receipt_layout' (rewrite receipt flex/grid markup for Dompdf |
| 45 |
* and lift the root padding into @page margins). |
| 46 |
* |
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* @return string The PDF document bytes (begins with '%PDF-'). |
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*/ |
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public function render_html( string $html, array $opts = array() ): string { |
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$html = $this->prepare_html_for_render( $html, $opts ); |
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|
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$paper = isset( $opts['paper'] ) ? $opts['paper'] : 'A4'; |
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if ( ! empty( $opts['fit_height'] ) && \is_array( $paper ) ) { |
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$opts['paper'] = $this->fit_height_paper( $html, $opts, $paper ); |
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} |
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|
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return (string) $this->build( $html, $opts )->output(); |
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} |
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|
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/** |
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* Prepare receipt HTML for Dompdf's locked-down render environment. |
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* |
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* @param string $html HTML document to render. |
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* @param array $opts Render options. |
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* |
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* @return string Prepared HTML. |
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*/ |
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private function prepare_html_for_render( string $html, array $opts ): string { |
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// Opt-in: the rewrite encodes receipt-layout knowledge (including legacy |
| 70 |
// template class names), so it is only applied when the caller asks for it |
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// (receipt rendering) rather than for every generic HTML document. |
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if ( ! empty( $opts['receipt_layout'] ) ) { |
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$preprocessor = new Pdf_Layout_Preprocessor(); |
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$html = $preprocessor->process( $html ); |
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|
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// The preprocessor owns full-document detection so the two sides |
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// can never disagree about which treatment an input received. |
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if ( $preprocessor->is_full_document() ) { |
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// Full HTML documents (the legacy-php receipt template) keep |
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// their own <head> stylesheet, charset and Dompdf's default |
| 81 |
// page margins; the preprocessor rewrote their flex containers |
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// (inline-styled and known legacy classes) in place. |
| 83 |
return $this->embed_local_images( $html ); |
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} |
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|
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// Match the browser preview: the template's own root padding is |
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// the only whitespace around the receipt, so it replaces Dompdf's |
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// default 1.2cm page margin (and keeps later pages consistent |
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// with page one). |
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$margins = $preprocessor->get_page_margins_pt(); |
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|
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$page_style = '<style>@page { margin: ' |
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. implode( |
| 94 |
' ', |
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array_map( |
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static function ( float $pt ): string { |
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return self::css_number( $pt ) . 'pt'; |
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}, |
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$margins |
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) |
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) |
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. '; } body { margin: 0; padding: 0; }</style>'; |
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|
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// Receipts are UTF-8 fragments with no charset declaration; |
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// without one Dompdf sniffs the encoding and mostly-ASCII |
| 106 |
// receipts with a stray multibyte character (e.g. an em dash) |
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// get mis-decoded. |
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$charset_meta = '<meta http-equiv="Content-Type" content="text/html; charset=utf-8">'; |
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|
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$html = $this->inject_head_styles( $html, $charset_meta . $page_style ); |
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} |
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|
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return $this->embed_local_images( $html ); |
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} |
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|
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/** |
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* Format a float for CSS output, immune to LC_NUMERIC comma locales. |
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* |
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* @param float $value The value to format. |
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* |
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* @return string The formatted number. |
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*/ |
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private static function css_number( float $value ): string { |
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$formatted = rtrim( rtrim( number_format( $value, 2, '.', '' ), '0' ), '.' ); |
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|
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return '' === $formatted ? '0' : $formatted; |
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} |
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|
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/** |
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* Prepend compatibility stylesheets to the receipt HTML. |
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* |
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* Inserted just before `</head>` when the HTML is a full document, otherwise |
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* prepended to the fragment (Dompdf wraps loose markup in html/body itself). |
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* Placing the stylesheet last in the head lets its `!important` rules win the |
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* cascade over template styles. |
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* |
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* @param string $html The receipt HTML. |
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* @param string $styles The <style> block(s) to inject. |
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* |
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* @return string The HTML with the stylesheets injected. |
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*/ |
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private function inject_head_styles( string $html, string $styles ): string { |
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$head_close = stripos( $html, '</head>' ); |
| 144 |
if ( false !== $head_close ) { |
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return substr_replace( $html, $styles, $head_close, 0 ); |
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} |
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|
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return $styles . $html; |
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} |
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|
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/** |
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* Embed local WordPress image URLs as data URIs. |
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* |
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* Dompdf remote loading and local file access are intentionally disabled, so |
| 155 |
* receipt logos and bundled assets must be inlined. Only URLs that resolve to |
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* known local WordPress/plugin paths are embedded; external URLs are left |
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* untouched. |
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* |
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* @param string $html HTML document. |
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* |
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* @return string HTML with local image sources embedded. |
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*/ |
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private function embed_local_images( string $html ): string { |
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return (string) preg_replace_callback( |
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'/(<img\b[^>]*\bsrc\s*=\s*["\'])([^"\']+)(["\'][^>]*>)/i', |
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function ( array $matches ): string { |
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$data_uri = $this->image_src_to_data_uri( html_entity_decode( $matches[2], ENT_QUOTES, 'UTF-8' ) ); |
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if ( null === $data_uri ) { |
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return $matches[0]; |
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} |
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|
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return $matches[1] . esc_attr( $data_uri ) . $matches[3]; |
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}, |
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$html |
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); |
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} |
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|
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/** |
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* Convert a local image source to a data URI. |
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* |
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* @param string $src Image source. |
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* |
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* @return string|null Data URI, or null when the source is not embeddable. |
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*/ |
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private function image_src_to_data_uri( string $src ): ?string { |
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if ( '' === $src || 0 === strpos( $src, 'data:' ) ) { |
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return null; |
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} |
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|
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$path = $this->local_image_path_from_src( $src ); |
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if ( null === $path || ! is_readable( $path ) || ! is_file( $path ) ) { |
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return null; |
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} |
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|
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$bytes = file_get_contents( $path ); |
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if ( false === $bytes || '' === $bytes ) { |
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return null; |
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} |
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|
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$mime = $this->image_mime_type( $path ); |
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if ( null === $mime ) { |
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return null; |
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} |
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|
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return 'data:' . $mime . ';base64,' . base64_encode( $bytes ); |
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} |
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|
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/** |
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* Resolve an image src to a safe local filesystem path. |
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* |
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* @param string $src Image source. |
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* |
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* @return string|null Local path, or null when the src is external/unknown. |
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*/ |
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private function local_image_path_from_src( string $src ): ?string { |
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$src = trim( $src ); |
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$src = explode( '#', $src, 2 )[0]; |
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$src = explode( '?', $src, 2 )[0]; |
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|
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if ( 0 === strpos( $src, '/' ) && 0 !== strpos( $src, '//' ) && \defined( 'ABSPATH' ) ) { |
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$path = wp_normalize_path( ABSPATH . ltrim( $src, '/' ) ); |
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return $this->is_allowed_local_image_path( $path ) ? $path : null; |
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} |
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|
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$mappings = $this->local_url_path_mappings(); |
| 226 |
foreach ( $mappings as $url_base => $path_base ) { |
| 227 |
if ( 0 !== strpos( $src, $url_base ) ) { |
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continue; |
| 229 |
} |
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|
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$relative = ltrim( substr( $src, \strlen( $url_base ) ), '/\\' ); |
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$path = wp_normalize_path( trailingslashit( $path_base ) . $relative ); |
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|
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return $this->is_allowed_local_image_path( $path ) ? $path : null; |
| 235 |
} |
| 236 |
|
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return null; |
| 238 |
} |
| 239 |
|
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/** |
| 241 |
* Build URL-to-path mappings for local WordPress assets. |
| 242 |
* |
| 243 |
* @return array<string,string> |
| 244 |
*/ |
| 245 |
private function local_url_path_mappings(): array { |
| 246 |
$uploads = wp_upload_dir(); |
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$plugin = dirname( __DIR__, 2 ); |
| 248 |
|
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$mappings = array( |
| 250 |
$uploads['baseurl'] => $uploads['basedir'], |
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content_url() => \defined( 'WP_CONTENT_DIR' ) ? WP_CONTENT_DIR : '', |
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plugins_url( '', $plugin . '/woocommerce-pos.php' ) => $plugin, |
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); |
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|
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$normalized = array(); |
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foreach ( $mappings as $url => $path ) { |
| 257 |
if ( '' === $url || '' === $path ) { |
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continue; |
| 259 |
} |
| 260 |
|
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$normalized[ trailingslashit( $url ) ] = wp_normalize_path( $path ); |
| 262 |
} |
| 263 |
|
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uksort( |
| 265 |
$normalized, |
| 266 |
static function ( string $a, string $b ): int { |
| 267 |
return \strlen( $b ) <=> \strlen( $a ); |
| 268 |
} |
| 269 |
); |
| 270 |
|
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return $normalized; |
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} |
| 273 |
|
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/** |
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* Check that a resolved path stays within known local asset roots. |
| 276 |
* |
| 277 |
* @param string $path Resolved path. |
| 278 |
* |
| 279 |
* @return bool |
| 280 |
*/ |
| 281 |
private function is_allowed_local_image_path( string $path ): bool { |
| 282 |
$real_path = realpath( $path ); |
| 283 |
if ( false === $real_path ) { |
| 284 |
return false; |
| 285 |
} |
| 286 |
|
| 287 |
$real_path = wp_normalize_path( $real_path ); |
| 288 |
foreach ( $this->allowed_local_image_roots() as $root ) { |
| 289 |
if ( 0 === strpos( $real_path, trailingslashit( $root ) ) || $real_path === $root ) { |
| 290 |
return true; |
| 291 |
} |
| 292 |
} |
| 293 |
|
| 294 |
return false; |
| 295 |
} |
| 296 |
|
| 297 |
/** |
| 298 |
* Allowed local image roots. |
| 299 |
* |
| 300 |
* @return string[] |
| 301 |
*/ |
| 302 |
private function allowed_local_image_roots(): array { |
| 303 |
$uploads = wp_upload_dir(); |
| 304 |
$roots = array( |
| 305 |
$uploads['basedir'], |
| 306 |
\defined( 'WP_CONTENT_DIR' ) ? WP_CONTENT_DIR : '', |
| 307 |
dirname( __DIR__, 2 ), |
| 308 |
); |
| 309 |
|
| 310 |
return array_values( |
| 311 |
array_filter( |
| 312 |
array_map( |
| 313 |
static function ( string $root ): string { |
| 314 |
$real = realpath( $root ); |
| 315 |
return false === $real ? '' : wp_normalize_path( $real ); |
| 316 |
}, |
| 317 |
$roots |
| 318 |
) |
| 319 |
) |
| 320 |
); |
| 321 |
} |
| 322 |
|
| 323 |
/** |
| 324 |
* Determine a supported image MIME type from path. |
| 325 |
* |
| 326 |
* @param string $path Local image path. |
| 327 |
* |
| 328 |
* @return string|null MIME type. |
| 329 |
*/ |
| 330 |
private function image_mime_type( string $path ): ?string { |
| 331 |
$type = wp_check_filetype( $path ); |
| 332 |
$mime = false !== $type['type'] ? (string) $type['type'] : ''; |
| 333 |
|
| 334 |
if ( '' === $mime ) { |
| 335 |
$extension = strtolower( pathinfo( $path, PATHINFO_EXTENSION ) ); |
| 336 |
$mime = array( |
| 337 |
'gif' => 'image/gif', |
| 338 |
'jpg' => 'image/jpeg', |
| 339 |
'jpeg' => 'image/jpeg', |
| 340 |
'png' => 'image/png', |
| 341 |
'svg' => 'image/svg+xml', |
| 342 |
'webp' => 'image/webp', |
| 343 |
)[ $extension ] ?? ''; |
| 344 |
} |
| 345 |
|
| 346 |
if ( 0 !== strpos( $mime, 'image/' ) ) { |
| 347 |
return null; |
| 348 |
} |
| 349 |
|
| 350 |
return $mime; |
| 351 |
} |
| 352 |
|
| 353 |
/** |
| 354 |
* Build and render a Dompdf instance. |
| 355 |
* |
| 356 |
* @param string $html HTML document to render. |
| 357 |
* @param array $opts Render options. |
| 358 |
* |
| 359 |
* @return mixed Rendered Dompdf instance. |
| 360 |
*/ |
| 361 |
private function build( string $html, array $opts ) { |
| 362 |
$temp_dir = $this->writable_dir(); |
| 363 |
|
| 364 |
$options = new Options(); |
| 365 |
$options->set( 'isRemoteEnabled', false ); |
| 366 |
$options->set( 'isPhpEnabled', false ); |
| 367 |
$options->set( 'isJavascriptEnabled', false ); |
| 368 |
$options->set( 'defaultFont', isset( $opts['default_font'] ) ? (string) $opts['default_font'] : 'dejavu sans' ); |
| 369 |
// Keep Dompdf's bundled fonts as the font source (default fontDir), but |
| 370 |
// direct its writable caches at a WCPOS-owned temp dir. |
| 371 |
$options->set( 'fontCache', $temp_dir ); |
| 372 |
$options->set( 'tempDir', $temp_dir ); |
| 373 |
// chroot only gates Dompdf's file:// local-URI access (e.g. <img src> / |
| 374 |
// @import to local paths); Dompdf still loads its bundled fonts from its |
| 375 |
// own rootDir/fontDir, so confining chroot to $temp_dir does not break |
| 376 |
// font rendering. With isRemoteEnabled false and images embedded as data |
| 377 |
// URIs, no local file access is needed anyway. |
| 378 |
$options->set( 'chroot', array( $temp_dir ) ); |
| 379 |
|
| 380 |
$dompdf = new Dompdf( $options ); |
| 381 |
$dompdf->loadHtml( $html ); |
| 382 |
|
| 383 |
$paper = isset( $opts['paper'] ) ? $opts['paper'] : 'A4'; |
| 384 |
$orientation = isset( $opts['orientation'] ) ? (string) $opts['orientation'] : 'portrait'; |
| 385 |
$dompdf->setPaper( $paper, $orientation ); |
| 386 |
|
| 387 |
$this->render_dompdf( $dompdf ); |
| 388 |
|
| 389 |
return $dompdf; |
| 390 |
} |
| 391 |
|
| 392 |
/** |
| 393 |
* Render a Dompdf instance while ignoring PHP 8.5 vendor deprecations. |
| 394 |
* |
| 395 |
* @param mixed $dompdf Dompdf instance. |
| 396 |
*/ |
| 397 |
private function render_dompdf( $dompdf ): void { |
| 398 |
$previous_handler = null; |
| 399 |
$previous_handler = set_error_handler( |
| 400 |
static function ( int $errno, string $errstr, string $errfile = '', int $errline = 0 ) use ( &$previous_handler ): bool { |
| 401 |
if ( |
| 402 |
0 !== ( $errno & ( E_DEPRECATED | E_USER_DEPRECATED ) ) |
| 403 |
&& false !== strpos( str_replace( '\\', '/', $errfile ), '/vendor_prefixed/' ) |
| 404 |
) { |
| 405 |
return true; |
| 406 |
} |
| 407 |
|
| 408 |
if ( \is_callable( $previous_handler ) ) { |
| 409 |
return (bool) \call_user_func( $previous_handler, $errno, $errstr, $errfile, $errline ); |
| 410 |
} |
| 411 |
|
| 412 |
return false; |
| 413 |
} |
| 414 |
); |
| 415 |
|
| 416 |
try { |
| 417 |
$dompdf->render(); |
| 418 |
} finally { |
| 419 |
restore_error_handler(); |
| 420 |
} |
| 421 |
} |
| 422 |
|
| 423 |
/** |
| 424 |
* Fit a custom paper box to the smallest height that keeps content on one page. |
| 425 |
* |
| 426 |
* The vendored Dompdf frame tree does not expose reliable post-render content |
| 427 |
* frames for this path, so use the documented Canvas page count as the signal. |
| 428 |
* |
| 429 |
* @param string $html HTML document to render. |
| 430 |
* @param array $opts Render options. |
| 431 |
* @param array $paper Custom paper box [x0,y0,x1,y1]. |
| 432 |
* |
| 433 |
* @return array Fitted custom paper box. |
| 434 |
*/ |
| 435 |
private function fit_height_paper( string $html, array $opts, array $paper ): array { |
| 436 |
$probe_paper = array( $paper[0], $paper[1], $paper[2], self::FIT_HEIGHT_PROBE_PT ); |
| 437 |
$probe_opts = $opts; |
| 438 |
unset( $probe_opts['fit_height'] ); |
| 439 |
$probe_opts['paper'] = $probe_paper; |
| 440 |
|
| 441 |
$high = self::FIT_HEIGHT_PROBE_PT; |
| 442 |
$low = 1.0; |
| 443 |
|
| 444 |
$probe = $this->build( $html, $probe_opts ); |
| 445 |
if ( $probe->getCanvas()->get_page_count() > 1 ) { |
| 446 |
return $probe_paper; |
| 447 |
} |
| 448 |
|
| 449 |
for ( $i = 0; $i < self::FIT_HEIGHT_SEARCH_STEPS; $i++ ) { |
| 450 |
$mid = ( $low + $high ) / 2; |
| 451 |
$test_opts = $probe_opts; |
| 452 |
$test_opts['paper'] = array( $paper[0], $paper[1], $paper[2], $mid ); |
| 453 |
|
| 454 |
if ( $this->build( $html, $test_opts )->getCanvas()->get_page_count() <= 1 ) { |
| 455 |
$high = $mid; |
| 456 |
} else { |
| 457 |
$low = $mid; |
| 458 |
} |
| 459 |
} |
| 460 |
|
| 461 |
return array( $paper[0], $paper[1], $paper[2], ceil( $high ) + self::FIT_HEIGHT_MARGIN_PT ); |
| 462 |
} |
| 463 |
|
| 464 |
/** |
| 465 |
* Resolve a writable directory for Dompdf's font cache and temp files. |
| 466 |
* |
| 467 |
* @return string Absolute path to a writable WCPOS-owned temp directory. |
| 468 |
*/ |
| 469 |
private function writable_dir(): string { |
| 470 |
$dir = rtrim( get_temp_dir(), '/\\' ) . '/wcpos-dompdf'; |
| 471 |
if ( ! is_dir( $dir ) ) { |
| 472 |
wp_mkdir_p( $dir ); |
| 473 |
// Restrict the freshly created cache dir to the owner; it holds |
| 474 |
// rendered font caches and temp PDFs that need not be world-readable. |
| 475 |
@chmod( $dir, 0700 ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged |
| 476 |
} |
| 477 |
|
| 478 |
return $dir; |
| 479 |
} |
| 480 |
} |
| 481 |
|
