show error message if no camera is present

Dockerfile

@@ -0,0 +1,58 @@
+# Based on https://github.com/vercel/next.js/tree/canary/examples/with-docker
+
+FROM node:24-alpine AS base
+
+# Install dependencies only when needed
+FROM base AS deps
+# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+
+# Install dependencies based on the preferred package manager
+COPY package.json package-lock.json* ./
+RUN npm ci
+
+# Rebuild the source code only when needed
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# Next.js collects completely anonymous telemetry data about general usage.
+# Learn more here: https://nextjs.org/telemetry
+# Uncomment the following line in case you want to disable telemetry during the build.
+ENV NEXT_TELEMETRY_DISABLED 1
+
+RUN npm run build
+
+# Production image, copy all the files and run next
+FROM base AS runner
+WORKDIR /app
+
+ENV NODE_ENV production
+# Uncomment the following line in case you want to disable telemetry during runtime.
+ENV NEXT_TELEMETRY_DISABLED 1
+
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+
+# Set the correct permission for prerender cache
+RUN mkdir .next
+RUN chown nextjs:nodejs .next
+
+# Automatically leverage output traces to reduce image size
+# https://nextjs.org/docs/advanced-features/output-file-tracing
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+
+EXPOSE 3000
+
+ENV PORT=3000
+
+# server.js is created by next build from the standalone output
+# https://nextjs.org/docs/pages/api-reference/next-config-js/output
+CMD HOSTNAME="0.0.0.0" node server.js

src/components/Scanner.tsx

@@ -138,6 +138,14 @@ export default function Scanner({ onScan }: ScannerProps) {
 
   return (
     <div className="w-full max-w-2xl mx-auto">
+      {hasCamera === false ? (
+        <div className="p-4 text-center">
+          <p className="text-red-600 text-lg">
+            Denne nettsiden krever tilgang til et kamera.
+          </p>
+        </div>
+      ) : (
+        <>
           <div className={getVideoContainerClass()}>
             <video
               ref={videoRef}
@@ -270,6 +278,9 @@ export default function Scanner({ onScan }: ScannerProps) {
               )}
             </div>
           </div>
+        </>
+      )}
+
       <style jsx>{`
         /* Responsive video container for mobile portrait */
         @media (max-width: 768px) and (orientation: portrait) {