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<?php |
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/** |
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* PDF Receipt Generator. |
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* |
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* Generates PDF donation receipts using the mPDF library. |
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* |
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* @package SureDonation |
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*/ |
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|
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namespace SureDonation\Inc\Pdf; |
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|
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use SureDonation\Inc\Database\Tables\Donations; |
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use SureDonation\Inc\Database\Tables\Donors; |
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use SureDonation\Inc\Helper; |
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use SureDonation\Inc\Payments\Payment_Helper; |
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|
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// Exit if accessed directly. |
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; |
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} |
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|
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/** |
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* Receipt_Generator class. |
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* |
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* @since 1.0.0 |
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*/ |
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class Receipt_Generator { |
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/** |
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* Get an existing receipt PDF or generate a new one. |
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* |
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* @param int $donation_id Donation ID. |
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* @return string|false File path on success, false on failure. |
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* @since 1.0.0 |
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*/ |
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public static function get_or_generate( $donation_id ) { |
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$donation = Donations::get( $donation_id ); |
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|
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if ( ! $donation ) { |
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return false; |
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} |
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|
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if ( ! self::should_generate( $donation ) ) { |
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return false; |
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} |
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|
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// Check if a cached PDF exists. |
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$existing_relative = $donation['receipt_pdf_url'] ?? ''; |
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|
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if ( ! empty( $existing_relative ) ) { |
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$existing_path = self::relative_to_path( Helper::get_string_value( $existing_relative ) ); |
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|
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if ( $existing_path && file_exists( $existing_path ) ) { |
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return $existing_path; |
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} |
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} |
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|
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return self::generate( $donation_id ); |
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} |
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|
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/** |
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* Generate a PDF receipt for a donation. |
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* |
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* @param int $donation_id Donation ID. |
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* @return string|false File path on success, false on failure. |
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* @since 1.0.0 |
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*/ |
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public static function generate( $donation_id ) { |
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if ( ! Pdf_Utils::check_if_library_exists() || ! Pdf_Utils::is_php_compatible() ) { |
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return false; |
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} |
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|
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// Load the mPDF autoloader. |
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require_once Pdf_Utils::get_library_path() . '/vendor/autoload.php'; |
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|
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$donation = Donations::get( $donation_id ); |
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|
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if ( ! $donation ) { |
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return false; |
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} |
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|
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if ( ! self::should_generate( $donation ) ) { |
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return false; |
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} |
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|
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$donor_id = Helper::get_integer_value( $donation['donor_id'] ?? 0 ); |
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$donor = $donor_id ? Donors::get( $donor_id ) : null; |
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|
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$campaign_id = Helper::get_integer_value( $donation['campaign_id'] ?? 0 ); |
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$campaign_title = $campaign_id ? (string) get_the_title( $campaign_id ) : ''; |
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|
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// Build the receipt HTML. |
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$html = self::build_receipt_html( $donation, $donor, $campaign_title ); |
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|
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/** |
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* Filter the receipt HTML before PDF generation. |
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* |
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* SECURITY NOTE: The returned HTML is passed directly to mPDF's |
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* WriteHTML(). Resource fetching is blocked at the mPDF level by the |
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* empty 'whitelistStreamWrappers' in self::get_mpdf_config(), so an |
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* `<img src>` cannot reach a remote host or a local file — but that is |
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* the only guarantee. Everything else about the returned markup is |
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* trusted, so only ever return escaped content. |
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* |
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* @param string $html Receipt HTML. |
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* @param array $donation Donation data. |
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* @param array|null $donor Donor data. |
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* @since 1.0.0 |
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*/ |
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$html = apply_filters( 'suredonation_receipt_html', $html, $donation, $donor ); |
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|
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// Ensure receipts directory exists. |
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Pdf_Utils::ensure_receipts_dir(); |
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|
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$receipts_dir = Pdf_Utils::get_receipts_dir(); |
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$default_filename = sprintf( 'suredonation-receipt-%d-%s.pdf', $donation_id, wp_generate_password( 8, false ) ); |
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|
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/** |
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* Filter the receipt PDF filename. |
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* |
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* The default filename carries a random suffix; the receipts directory |
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* is access-protected, but the suffix keeps individual filenames |
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* unguessable as defense in depth. The filtered value is passed through |
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* sanitize_file_name() and forced to a .pdf extension; an empty result |
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* falls back to the default. |
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* |
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* @param string $default_filename Generated filename. |
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* @param array<string, mixed> $donation Donation data. |
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* @param array<string, mixed>|null $donor Donor data. |
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* @since 1.5.0 |
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*/ |
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$filename = apply_filters( 'suredonation_receipt_filename', $default_filename, $donation, $donor ); |
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$filename = sanitize_file_name( Helper::get_string_value( $filename ) ); |
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|
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if ( '' === $filename ) { |
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$filename = $default_filename; |
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} elseif ( 'pdf' !== strtolower( pathinfo( $filename, PATHINFO_EXTENSION ) ) ) { |
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$filename .= '.pdf'; |
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} |
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|
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$filepath = $receipts_dir . '/' . $filename; |
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|
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try { |
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$mpdf = new \Mpdf\Mpdf( self::get_mpdf_config( $donation, $donor ) ); |
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|
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/** |
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* Fires after the mPDF instance is created, before the receipt HTML is written. |
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* |
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* Allows instance-level configuration the constructor config cannot |
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* express — e.g. SetProtection() for password-protected receipts or |
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* SetTitle()/SetAuthor() document metadata. |
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* |
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* @param \Mpdf\Mpdf $mpdf mPDF instance. |
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* @param array<string, mixed> $donation Donation data. |
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* @param array<string, mixed>|null $donor Donor data. |
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* @since 1.5.0 |
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*/ |
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do_action( 'suredonation_receipt_mpdf_instance', $mpdf, $donation, $donor ); |
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|
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$mpdf->WriteHTML( $html ); |
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$mpdf->Output( $filepath, \Mpdf\Output\Destination::FILE ); |
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} catch ( \Exception $e ) { |
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return false; |
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} |
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|
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// Store the relative path in the donation record (portable across domain changes). |
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$upload_dir = wp_upload_dir(); |
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$relative_path = str_replace( $upload_dir['basedir'] . '/', '', $filepath ); |
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Donations::update( $donation_id, [ 'receipt_pdf_url' => $relative_path ] ); |
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|
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/** |
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* Fires after a receipt PDF has been generated and stored. |
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* |
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* @param int $donation_id Donation ID. |
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* @param string $filepath Absolute path to the generated PDF. |
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* @param array<string, mixed> $donation Donation data. |
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* @since 1.5.0 |
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*/ |
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do_action( 'suredonation_receipt_generated', $donation_id, $filepath, $donation ); |
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|
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return $filepath; |
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} |
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|
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/** |
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* Whether a receipt should be generated or served for a donation. |
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* |
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* @param array<string, mixed> $donation Donation data. |
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* @return bool |
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* @since 1.5.0 |
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*/ |
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private static function should_generate( $donation ) { |
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/** |
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* Short-circuit filter to disable receipt generation for a donation. |
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* |
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* Return false to prevent generating a new receipt PDF and to stop a |
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* previously cached one from being served. Lets extensions disable |
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* receipts selectively — e.g. a per-form "disable PDF receipt" |
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* setting keyed on the donation's form_id. |
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* |
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* @param bool $should_generate Whether to generate/serve the receipt. Default true. |
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* @param array<string, mixed> $donation Donation data. |
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* @since 1.5.0 |
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*/ |
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return (bool) apply_filters( 'suredonation_should_generate_receipt', true, $donation ); |
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} |
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|
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/** |
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* Delete a receipt PDF file by its stored uploads-relative path. |
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* |
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* Used by the personal-data eraser: the receipt is generated from the donor's |
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* name/email/address, so an erasure must remove the file from disk, not just |
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* the database columns. |
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* |
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* @since 1.2.0 |
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* @param string $relative_path Relative path within the uploads directory. |
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* @return bool True when no file remains (deleted or never existed), false when it survived deletion. |
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*/ |
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public static function delete_receipt( $relative_path ) { |
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$filepath = self::relative_to_path( $relative_path ); |
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|
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if ( false === $filepath || ! file_exists( $filepath ) ) { |
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return true; |
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} |
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|
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wp_delete_file( $filepath ); |
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|
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// Re-check with is_file() (not file_exists()) — wp_delete_file() has a |
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// filesystem side effect PHPStan can't see, so re-calling the already |
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// narrowed file_exists() reads as always-false to it. |
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clearstatcache( true, $filepath ); |
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|
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return ! is_file( $filepath ); |
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} |
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|
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/** |
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* Get the mPDF configuration. |
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* |
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* @param array<string, mixed> $donation Donation data. |
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* @param array<string, mixed>|null $donor Donor data. |
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* @return array<string,mixed> |
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* @since 1.0.0 |
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*/ |
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private static function get_mpdf_config( $donation = [], $donor = null ) { |
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$config = [ |
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'mode' => 'utf-8', |
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'format' => 'A4', |
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'orientation' => 'P', |
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'margin_left' => 15, |
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'margin_right' => 15, |
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'margin_top' => 15, |
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'margin_bottom' => 15, |
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'default_font' => 'dejavusans', |
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'tempDir' => Pdf_Utils::get_temp_dir(), |
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// mPDF resolves `<img src>` and CSS url() through stream wrappers, |
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// and its default whitelist is ['http', 'https', 'file'] — so out of |
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// the box a src can reach an internal host (SSRF) or read a local |
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// file into the PDF (LFI). The receipt HTML is server-templated with |
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// escaped fields, but the suredonation_receipt_html filter and the |
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// Pro receipt templates both put author-controlled HTML through |
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// WriteHTML(), and wp_kses_post() permits <img src="http(s)://…">. |
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// |
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// Emptying the whitelist is the actual control: Mpdf\File\ |
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// StreamWrapperChecker then rejects every `scheme://` src before a |
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// fetch happens. Nothing legitimate needs one — the logo is |
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// embedded as a data: URI (no `://`, so the check never fires) and |
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// local font/temp paths are plain paths. A blocked <img> degrades to |
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// mPDF's own imageError() handling rather than failing the render. |
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'whitelistStreamWrappers' => [], |
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// Kept as defence in depth: if a filter callback ever re-whitelists |
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// http(s), requests still verify SSL. This is not what stops the |
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// fetch — the whitelist above is. |
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'curlAllowUnsafeSslRequests' => false, |
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]; |
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|
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/** |
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* Filter the mPDF configuration used for receipt generation. |
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* |
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* SECURITY NOTE: 'whitelistStreamWrappers' is emptied deliberately. |
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* Restoring any entry lets HTML that reaches WriteHTML() fetch that |
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* scheme, which is SSRF for http(s) and LFI for file://. It is |
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* force-reset to [] after this filter runs, so callbacks cannot widen |
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* it; resolve trusted assets (e.g. a logo attachment) to a data: URI or |
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* a validated local path server-side instead. |
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* |
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* @param array<string, mixed> $config mPDF configuration. |
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* @param array<string, mixed> $donation Donation data. |
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* @param array<string, mixed>|null $donor Donor data. |
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* @since 1.5.0 |
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*/ |
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$config = apply_filters( 'suredonation_receipt_mpdf_config', $config, $donation, $donor ); |
| 290 |
$config = is_array( $config ) ? $config : []; |
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|
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// Enforced post-filter: an empty stream-wrapper whitelist is what gates |
| 293 |
// LFI/SSRF in mPDF, so it stays empty regardless of what filter |
| 294 |
// callbacks return. |
| 295 |
$config['whitelistStreamWrappers'] = []; |
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$config['curlAllowUnsafeSslRequests'] = false; |
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|
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return $config; |
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} |
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|
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/** |
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* Build the receipt HTML template. |
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* |
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* @param array<string, mixed> $donation Donation data. |
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* @param array<string, mixed>|null $donor Donor data. |
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* @param string $campaign_title Campaign title. |
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* @return string HTML content. |
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* @since 1.0.0 |
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*/ |
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private static function build_receipt_html( $donation, $donor, $campaign_title ) { |
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$site_name = esc_html( get_bloginfo( 'name' ) ); |
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$site_url = esc_url( site_url() ); |
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|
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$donation_id = Helper::get_integer_value( $donation['id'] ?? 0 ); |
| 315 |
// Prefer the name captured on this specific donation — it is the correct |
| 316 |
// identity for a tax receipt and is unaffected by the donor record being |
| 317 |
// set-once. Fall back to the donor record only when the donation itself |
| 318 |
// carries no name. |
| 319 |
$donation_donor_name = Helper::get_string_value( $donation['donor_name'] ?? '' ); |
| 320 |
$donor_name = esc_html( '' !== $donation_donor_name ? $donation_donor_name : Helper::get_string_value( $donor['name'] ?? '' ) ); |
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$donor_email = esc_html( Helper::get_string_value( $donor['email'] ?? '' ) ); |
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$payment_status = esc_html( ucfirst( Helper::get_string_value( $donation['payment_status'] ?? '' ) ) ); |
| 323 |
$payment_method = esc_html( ucfirst( Helper::get_string_value( $donation['gateway'] ?? '' ) ) ); |
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$transaction_id = esc_html( Helper::get_string_value( $donation['transaction_id'] ?? '' ) ); |
| 325 |
$currency = Helper::get_string_value( $donation['currency'] ?? 'USD' ); |
| 326 |
$total = Helper::get_float_value( $donation['amount'] ?? 0 ); |
| 327 |
$fees_covered = Helper::get_float_value( $donation['fees_covered'] ?? 0 ); |
| 328 |
$amount = $total - $fees_covered; |
| 329 |
$date = Helper::get_string_value( $donation['created_at'] ?? '' ); |
| 330 |
|
| 331 |
if ( ! empty( $date ) ) { |
| 332 |
$date_format = Helper::get_string_value( get_option( 'date_format' ) ); |
| 333 |
$timestamp = strtotime( $date ); |
| 334 |
$formatted_date = false !== $timestamp ? wp_date( $date_format, $timestamp ) : false; |
| 335 |
$date = is_string( $formatted_date ) ? $formatted_date : $date; |
| 336 |
} |
| 337 |
|
| 338 |
$campaign_title = esc_html( $campaign_title ); |
| 339 |
|
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// Format amounts. |
| 341 |
$formatted_amount = self::format_currency( $amount, $currency ); |
| 342 |
$formatted_fees = self::format_currency( $fees_covered, $currency ); |
| 343 |
$formatted_total = self::format_currency( $total, $currency ); |
| 344 |
|
| 345 |
// Build transaction ID row. |
| 346 |
$transaction_row = ''; |
| 347 |
if ( ! empty( $transaction_id ) ) { |
| 348 |
$transaction_row = sprintf( |
| 349 |
'<tr><td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;color:#6b7280;font-size:13px;">%s</td> |
| 350 |
<td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;font-size:13px;color:#111827;">%s</td></tr>', |
| 351 |
esc_html__( 'Transaction ID', 'suredonation' ), |
| 352 |
$transaction_id |
| 353 |
); |
| 354 |
} |
| 355 |
|
| 356 |
// Build fees row. |
| 357 |
$fees_row = ''; |
| 358 |
if ( $fees_covered > 0 ) { |
| 359 |
$fees_row = sprintf( |
| 360 |
'<tr><td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;color:#6b7280;font-size:13px;">%s</td> |
| 361 |
<td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;font-size:13px;color:#111827;">%s</td></tr>', |
| 362 |
esc_html__( 'Fees Covered', 'suredonation' ), |
| 363 |
$formatted_fees |
| 364 |
); |
| 365 |
} |
| 366 |
|
| 367 |
return ' |
| 368 |
<div style="max-width:560px;margin:0 auto;font-family:DejaVu Sans,sans-serif;color:#111827;"> |
| 369 |
<div style="text-align:center;margin-bottom:24px;padding-bottom:20px;border-bottom:2px solid #e5e7eb;"> |
| 370 |
<h1 style="font-size:20px;margin:0 0 4px;color:#111827;">' . $site_name . '</h1> |
| 371 |
<p style="color:#6b7280;font-size:13px;margin:0;">' . esc_html__( 'Donation Receipt', 'suredonation' ) . '</p> |
| 372 |
</div> |
| 373 |
|
| 374 |
<p style="color:#6b7280;font-size:12px;margin:0 0 16px;text-align:right;">' |
| 375 |
. esc_html__( 'Receipt', 'suredonation' ) . ' #' . $donation_id . '</p> |
| 376 |
|
| 377 |
<table style="width:100%;border-collapse:collapse;margin-bottom:20px;border:1px solid #e5e7eb;border-radius:6px;"> |
| 378 |
<tr><td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;color:#6b7280;font-size:13px;width:40%;">' |
| 379 |
. esc_html__( 'Donor Name', 'suredonation' ) . '</td> |
| 380 |
<td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;font-size:13px;color:#111827;">' . $donor_name . '</td></tr> |
| 381 |
<tr><td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;color:#6b7280;font-size:13px;">' |
| 382 |
. esc_html__( 'Donor Email', 'suredonation' ) . '</td> |
| 383 |
<td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;font-size:13px;color:#111827;">' . $donor_email . '</td></tr> |
| 384 |
</table> |
| 385 |
|
| 386 |
<table style="width:100%;border-collapse:collapse;margin-bottom:20px;border:1px solid #e5e7eb;border-radius:6px;"> |
| 387 |
<tr><td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;color:#6b7280;font-size:13px;width:40%;">' |
| 388 |
. esc_html__( 'Campaign Name', 'suredonation' ) . '</td> |
| 389 |
<td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;font-size:13px;color:#111827;">' . $campaign_title . '</td></tr> |
| 390 |
<tr><td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;color:#6b7280;font-size:13px;">' |
| 391 |
. esc_html__( 'Payment Status', 'suredonation' ) . '</td> |
| 392 |
<td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;font-size:13px;color:#111827;">' . $payment_status . '</td></tr> |
| 393 |
<tr><td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;color:#6b7280;font-size:13px;">' |
| 394 |
. esc_html__( 'Payment Method', 'suredonation' ) . '</td> |
| 395 |
<td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;font-size:13px;color:#111827;">' . $payment_method . '</td></tr> |
| 396 |
' . $transaction_row . ' |
| 397 |
<tr><td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;color:#6b7280;font-size:13px;">' |
| 398 |
. esc_html__( 'Donation Amount', 'suredonation' ) . '</td> |
| 399 |
<td style="padding:10px 12px;border-bottom:1px solid #e5e7eb;font-size:13px;color:#111827;">' . $formatted_amount . '</td></tr> |
| 400 |
' . $fees_row . ' |
| 401 |
<tr><td style="padding:10px 12px;background:#f9fafb;font-weight:bold;color:#111827;font-size:13px;">' |
| 402 |
. esc_html__( 'Donation Total', 'suredonation' ) . '</td> |
| 403 |
<td style="padding:10px 12px;background:#f9fafb;font-weight:bold;font-size:13px;color:#111827;">' . $formatted_total . '</td></tr> |
| 404 |
</table> |
| 405 |
|
| 406 |
<p style="color:#6b7280;font-size:12px;margin:0 0 4px;">' |
| 407 |
. esc_html__( 'Date', 'suredonation' ) . ': ' . esc_html( $date ) . '</p> |
| 408 |
|
| 409 |
<div style="margin-top:30px;padding-top:16px;border-top:1px solid #e5e7eb;text-align:center;"> |
| 410 |
<p style="color:#9ca3af;font-size:11px;margin:0;">' |
| 411 |
. sprintf( |
| 412 |
/* translators: 1: Site name, 2: Site URL. */ |
| 413 |
esc_html__( 'Generated by %1$s · %2$s', 'suredonation' ), |
| 414 |
$site_name, |
| 415 |
$site_url |
| 416 |
) . '</p> |
| 417 |
</div> |
| 418 |
</div>'; |
| 419 |
} |
| 420 |
|
| 421 |
/** |
| 422 |
* Format a monetary amount with currency symbol. |
| 423 |
* |
| 424 |
* @param float $amount Amount to format. |
| 425 |
* @param string $currency Currency code. |
| 426 |
* @return string Formatted amount. |
| 427 |
* @since 1.0.0 |
| 428 |
*/ |
| 429 |
private static function format_currency( $amount, $currency = 'USD' ) { |
| 430 |
// Delegate to the single source of truth so the currency symbol, |
| 431 |
// decimal handling and sign position match every other surface |
| 432 |
// (this replaces a divergent local symbol map). |
| 433 |
return Payment_Helper::format_amount( $amount, $currency ); |
| 434 |
} |
| 435 |
|
| 436 |
/** |
| 437 |
* Convert a relative path to an absolute file path. |
| 438 |
* |
| 439 |
* @param string $relative_path Relative path within the uploads directory. |
| 440 |
* @return string|false Absolute file path or false. |
| 441 |
* @since 1.0.0 |
| 442 |
*/ |
| 443 |
private static function relative_to_path( $relative_path ) { |
| 444 |
if ( empty( $relative_path ) ) { |
| 445 |
return false; |
| 446 |
} |
| 447 |
|
| 448 |
$upload_dir = wp_upload_dir(); |
| 449 |
|
| 450 |
return $upload_dir['basedir'] . '/' . $relative_path; |
| 451 |
} |
| 452 |
} |
| 453 |
|
