feat: add asset variants endpoint

apps/web/app/api/assets/[id]/variants/route.ts

@@ -0,0 +1,43 @@
+import { z } from "zod";
+
+import { getDb } from "@tline/db";
+
+import { shapeVariants } from "./shape";
+
+export const runtime = "nodejs";
+
+const paramsSchema = z.object({
+  id: z.string().uuid(),
+});
+
+export async function GET(
+  _request: Request,
+  context: { params: Promise<{ id: string }> },
+): Promise<Response> {
+  const rawParams = await context.params;
+  const paramsParsed = paramsSchema.safeParse(rawParams);
+  if (!paramsParsed.success) {
+    return Response.json(
+      { error: "invalid_params", issues: paramsParsed.error.issues },
+      { status: 400 },
+    );
+  }
+
+  const db = getDb();
+  const rows = await db<
+    {
+      kind: string;
+      size: number;
+      key: string;
+      mime_type: string;
+      width: number | null;
+      height: number | null;
+    }[]
+  >`
+    select kind, size, key, mime_type, width, height
+    from asset_variants
+    where asset_id = ${paramsParsed.data.id}
+  `;
+
+  return Response.json(shapeVariants(rows));
+}