feat: multi-module iteration

apps/mini-user/src/lib/redeem-qr.ts

@@ -0,0 +1,42 @@
+import './text-encoding-polyfill';
+import QRCode from 'qrcode';
+
+const QR_SIZE = 240;
+const QR_OPTIONS = {
+  width: QR_SIZE * 2,
+  margin: 0,
+  color: { dark: '#1f1a17', light: '#ffffff' },
+} as const;
+
+/** 在 2d Canvas 上绘制二维码（小程序 / H5 通用） */
+export function drawRedeemQrOnCanvas(
+  ctx: CanvasRenderingContext2D,
+  token: string,
+  sizePx = QR_SIZE,
+) {
+  const qr = QRCode.create(token, { errorCorrectionLevel: 'M' });
+  const count = qr.modules.size;
+  const cell = sizePx / count;
+
+  ctx.fillStyle = '#ffffff';
+  ctx.fillRect(0, 0, sizePx, sizePx);
+  ctx.fillStyle = '#1f1a17';
+  for (let row = 0; row < count; row++) {
+    for (let col = 0; col < count; col++) {
+      if (qr.modules.get(row, col)) {
+        ctx.fillRect(col * cell, row * cell, cell, cell);
+      }
+    }
+  }
+}
+
+/** H5：Data URL；失败时回退到与 h5-user 相同的外部 QR 服务 */
+export async function buildRedeemQrDataUrl(token: string): Promise<string> {
+  try {
+    return await QRCode.toDataURL(token, QR_OPTIONS);
+  } catch {
+    return `https://api.qrserver.com/v1/create-qr-code/?size=${QR_SIZE * 2}x${QR_SIZE * 2}&data=${encodeURIComponent(token)}`;
+  }
+}
+
+export const REDEEM_QR_DISPLAY_SIZE = QR_SIZE;