feat:update form

lib/cdn-images.ts

@@ -0,0 +1,29 @@
+export const MAX_FORM_ANSWER_IMAGE_BYTES = 50 * 1024 * 1024;
+
+const ALLOWED_IMAGE_MIME_TYPES = new Set([
+  "image/png",
+  "image/jpeg",
+  "image/webp",
+  "image/gif",
+]);
+
+const ALLOWED_IMAGE_EXTENSIONS = new Set(["png", "jpg", "jpeg", "webp", "gif"]);
+
+export function validateImageUploadFile(file: Pick<File, "name" | "type" | "size">) {
+  if (!ALLOWED_IMAGE_MIME_TYPES.has(file.type)) {
+    throw new Error("Only PNG, JPG, WebP, and GIF images are allowed");
+  }
+
+  if (file.size > MAX_FORM_ANSWER_IMAGE_BYTES) {
+    throw new Error("Image must be 50MB or smaller");
+  }
+
+  const extension = (file.name.split(".").pop() || "").toLowerCase();
+  if (!ALLOWED_IMAGE_EXTENSIONS.has(extension)) {
+    throw new Error("Invalid image extension");
+  }
+}
+
+export function cdnUrl(id: string | null | undefined) {
+  return id ? `/cdn/${id}` : "";
+}