#7 - QR Codes & payments

2026-06-16 19:33:55 +02:00
parent cfbdca238c
commit df5f9b1df4
11 changed files with 251 additions and 72 deletions
@@ -0,0 +1,90 @@
+<?php
+
+namespace Reservair\Templating\Elements;
+
+use Reservair\Templating\RsvTemplateElement;
+use Reservair\Templating\RsvTemplateSymbols;
+use chillerlan\QRCode\Output\QRGdImagePNG;
+use chillerlan\QRCode\QRCode;
+use chillerlan\QRCode\Data\QRMatrix;
+use chillerlan\QRCode\QROptions;
+use chillerlan\QRCode\Output\QROutputInterface;
+
+/** Renders a QR payment code for the form's total price into an email body. */
+class RsvQrPaymentElement implements RsvTemplateElement {
+
+    public function render(RsvTemplateSymbols $symbols): string {
+        $account = trim((string) $symbols->get('account', ''));
+        if ($account === '') {
+            return ''; // No payee account configured — nothing to render.
+        }
+
+        $payload = $this->spayd(
+            $account,
+            (float)  $symbols->get('price', 0),
+            (string) $symbols->get('currency', 'CZK'),
+            (string) $symbols->get('message', ''),
+            (string) $symbols->get('variable_symbol', '')
+        );
+
+        $src = $this->image_url($payload);
+        if ($src === '') {
+            return ''; // Image could not be written.
+        }
+
+        return '<img class="rsv-qr-payment" alt="' . esc_attr__('QR platba', 'reservair')
+            . '" src="' . esc_url($src) . '" />';
+    }
+
+    public function symbols(): array {
+        return ['account', 'currency', 'message', 'variable_symbol'];
+    }
+
+    /** Builds a SPAYD string (Czech QR payment). '*' is the field delimiter. */
+    private function spayd(string $account, float $price, string $currency, string $message, string $vs): string {
+        $parts = [
+            'SPD*1.0',
+            'ACC:' . $account,
+            'AM:'  . number_format($price, 2, '.', ''),
+            'CC:'  . $currency,
+        ];
+        if ($message !== '') {
+            $parts[] = 'MSG:' . str_replace('*', ' ', $message);
+        }
+        if ($vs !== '') {
+            $parts[] = 'X-VS:' . preg_replace('/\D/', '', $vs);
+        }
+        return implode('*', $parts);
+    }
+
+    /**
+     * Writes the QR PNG under uploads (deduped by payload hash) and returns its
+     * public URL, or '' if it could not be written.
+     */
+    private function image_url(string $payload): string {
+        $uploads = wp_upload_dir();
+        $dir     = $uploads['basedir'] . '/reservair-qr';
+        $name    = hash('sha256', $payload) . '.png';
+        $path    = $dir . '/' . $name;
+
+        if (!file_exists($path)) {
+            wp_mkdir_p($dir);
+            if (file_put_contents($path, $this->png($payload)) === false) {
+                return '';
+            }
+        }
+
+        return $uploads['baseurl'] . '/reservair-qr/' . $name;
+    }
+
+    private function png(string $payload): string {
+        $options = new QROptions();
+        $options->version             = 7;
+        $options->outputInterface     = QRGdImagePNG::class;
+        $options->scale               = 4;
+        $options->outputBase64        = false;
+        $options->bgColor             = [200, 150, 200];
+
+        return (string) (new QRCode($options))->render($payload);
+    }
+}