Geoblocking (#176)

* feat: initial pass at geoblocking

* initial blocked page

* fix: build

* feat: region support

* fix: add matcher to skip redirects to /blocked

* chore: better matcher

* chore: update copy

src/middleware.ts

@@ -0,0 +1,62 @@
+import { NextRequest, NextResponse } from 'next/server';
+
+export const config = {
+  matcher: ['/((?!blocked/_next/static/backgrounds/fonts/favicon).*)'],
+};
+
+const BLOCKED_COUNTRIES = [
+  'CU', // Cuba
+  'KP', // North Korea
+  'RU', // Russia
+  'AF', // Afghanistan
+  'BY', // Belarus
+  'BA', // Bosnia & Herzegovina
+  'CF', // Central African Republic
+  'CD', // Democratic Republic of the Congo
+  'GN', // Guinea
+  'GW', // Guinea-Bissau
+  'HT', // Haiti
+  'IQ', // Iraq
+  'LB', // Lebanon
+  'LY', // Libya
+  'ML', // Mali
+  'NI', // Nicaragua
+  'SO', // Somalia
+  'SS', // South Sudan
+  'SD', // Sudan
+  'VE', // Venezuela
+  'YE', // Yemen
+  'ZW', // Zimbabwe
+  'MM', // Myanmar
+  'SY', // Syria
+];
+
+const BLOCKED_REGIONS = [
+  {
+    country: 'UA', // Ukraine
+    regions: [
+      '43', // Crimea
+      '14', // Donetsk
+      '09', // Luhansk
+    ],
+  },
+];
+
+export function middleware(req: NextRequest) {
+  const country = req.geo?.country;
+  const region = req.geo?.region;
+
+  if (country && BLOCKED_COUNTRIES.includes(country)) {
+    return NextResponse.redirect('/blocked');
+  }
+
+  if (
+    country &&
+    region &&
+    BLOCKED_REGIONS.find((x) => x.country === country)?.regions.includes(region)
+  ) {
+    return NextResponse.redirect('/blocked');
+  }
+
+  return NextResponse.next();
+}

src/pages/blocked.tsx

@@ -0,0 +1,11 @@
+import { ErrorBoundary } from '../components/errors/ErrorBoundary';
+
+export default function Page() {
+  return (
+    <ErrorBoundary>
+      {(() => {
+        throw new Error('Your region has been blocked from accessing this service');
+      })()}
+    </ErrorBoundary>
+  );
+}