feat: copy & download qr code as png (#2521)

* copy & download qr code as png

* i18n, accessibility

* improve error handling

src/app/components/Clients/QRCodeDialog.vue

@@ -5,10 +5,24 @@
     </template>
     <template #description>
       <div class="bg-white">
-        <img :src="qrCode" />
+        <img ref="img" :src="qrCode" />
       </div>
     </template>
     <template #actions>
+      <BaseSecondaryButton
+        class="flex items-center gap-2"
+        :title="$t('client.copyPng')"
+        @click="copyPng"
+      >
+        <IconsCopy class="size-5" /> PNG
+      </BaseSecondaryButton>
+      <BaseSecondaryButton
+        class="flex items-center gap-2"
+        :title="$t('client.downloadPng')"
+        @click="downloadPng"
+      >
+        <IconsDownload class="size-5" /> PNG
+      </BaseSecondaryButton>
       <DialogClose as-child>
         <BaseSecondaryButton>{{ $t('dialog.cancel') }}</BaseSecondaryButton>
       </DialogClose>
@@ -18,4 +32,87 @@
 
 <script setup lang="ts">
 defineProps<{ qrCode: string }>();
+
+const toast = useToast();
+const img = useTemplateRef('img');
+
+async function svgToPng() {
+  if (!img.value || !img.value.complete || img.value.naturalWidth === 0) {
+    throw new Error('image is not loaded');
+  }
+
+  const width = 1000;
+  const height = 1000;
+
+  const canvas = document.createElement('canvas');
+  canvas.width = width;
+  canvas.height = height;
+  const ctx = canvas.getContext('2d');
+  if (!ctx) {
+    throw new Error('was not able to create 2d context');
+  }
+  ctx.drawImage(img.value!, 0, 0, width, height);
+
+  return new Promise<Blob>((res, rej) => {
+    canvas.toBlob((blob) => {
+      if (!blob) {
+        return rej(new Error('was not able to create blob'));
+      }
+      return res(blob);
+    }, 'image/png');
+  });
+}
+
+async function downloadPng() {
+  try {
+    const blob = await svgToPng();
+
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement('a');
+    a.href = url;
+    a.download = 'client-config.png';
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    URL.revokeObjectURL(url);
+  } catch (e) {
+    console.error('failed to download png', e);
+    toast.showToast({
+      type: 'error',
+      message: $t('toast.unknown'),
+    });
+  }
+}
+
+async function copyPng() {
+  const blob = await svgToPng().catch((e) => {
+    console.error('failed to convert svg to png', e);
+    toast.showToast({
+      type: 'error',
+      message: $t('toast.unknown'),
+    });
+  });
+  if (!blob) {
+    return;
+  }
+
+  try {
+    await navigator.clipboard.write([
+      new ClipboardItem({
+        [blob.type]: blob,
+      }),
+    ]);
+
+    toast.showToast({
+      type: 'success',
+      message: $t('copy.copied'),
+    });
+  } catch (e) {
+    console.error('failed to copy png', e);
+    toast.showToast({
+      type: 'error',
+      message: $t('copy.failed'),
+    });
+  }
+}
 </script>