feat: sitemap

- also compress missing.svg
- add missing environment variable to .env.example

src/app/sitemap.ts

@@ -0,0 +1,77 @@
+import { prisma } from "@/lib/prisma";
+import type { MetadataRoute } from "next";
+
+type SitemapRoute = MetadataRoute.Sitemap[0];
+
+export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
+	const baseUrl = process.env.BASE_URL;
+	if (!baseUrl) {
+		console.error("BASE_URL environment variable missing");
+		return [];
+	}
+
+	const miis = await prisma.mii.findMany({
+		select: {
+			id: true,
+			createdAt: true,
+		},
+	});
+
+	const users = await prisma.user.findMany({
+		select: {
+			id: true,
+			updatedAt: true,
+		},
+	});
+
+	const dynamicRoutes: MetadataRoute.Sitemap = [
+		...miis.map(
+			(mii) =>
+				({
+					url: `${baseUrl}/mii/${mii.id}`,
+					lastModified: mii.createdAt,
+					changeFrequency: "weekly",
+					priority: 0.7,
+				} as SitemapRoute)
+		),
+		...users.map(
+			(user) =>
+				({
+					url: `${baseUrl}/profile/${user.id}`,
+					lastModified: user.updatedAt,
+					changeFrequency: "weekly",
+					priority: 0.7,
+				} as SitemapRoute)
+		),
+	];
+
+	const lastModified = new Date();
+
+	return [
+		{
+			url: baseUrl,
+			lastModified,
+			changeFrequency: "always",
+			priority: 1,
+		},
+		{
+			url: `${baseUrl}/login`,
+			lastModified,
+			changeFrequency: "monthly",
+			priority: 0.6,
+		},
+		{
+			url: `${baseUrl}/privacy`,
+			lastModified,
+			changeFrequency: "yearly",
+			priority: 0.4,
+		},
+		{
+			url: `${baseUrl}/terms-of-service`,
+			lastModified,
+			changeFrequency: "yearly",
+			priority: 0.4,
+		},
+		...dynamicRoutes,
+	];
+}