feat(media): add type-specific upload preset validation

packages/content/src/media.ts

@@ -9,6 +9,56 @@ export const mediaAssetTypeSchema = z.enum([
   "generic",
 ])
 
+export type MediaUploadRule = {
+  maxBytes: number
+  allowedMimePrefix?: string
+  allowedMimeExact?: string[]
+}
+
+export const mediaUploadRulesByType: Record<MediaAssetType, MediaUploadRule> = {
+  artwork: {
+    maxBytes: 40 * 1024 * 1024,
+    allowedMimePrefix: "image/",
+  },
+  banner: {
+    maxBytes: 20 * 1024 * 1024,
+    allowedMimePrefix: "image/",
+  },
+  promotion: {
+    maxBytes: 20 * 1024 * 1024,
+    allowedMimePrefix: "image/",
+  },
+  video: {
+    maxBytes: 250 * 1024 * 1024,
+    allowedMimePrefix: "video/",
+  },
+  gif: {
+    maxBytes: 40 * 1024 * 1024,
+    allowedMimeExact: ["image/gif"],
+  },
+  generic: {
+    maxBytes: 50 * 1024 * 1024,
+  },
+}
+
+export function isMimeAllowedForMediaType(type: MediaAssetType, mimeType: string): boolean {
+  const rule = mediaUploadRulesByType[type]
+
+  if (rule.allowedMimeExact?.includes(mimeType)) {
+    return true
+  }
+
+  if (rule.allowedMimePrefix) {
+    return mimeType.startsWith(rule.allowedMimePrefix)
+  }
+
+  return true
+}
+
+export function getMediaUploadMaxBytes(type: MediaAssetType): number {
+  return mediaUploadRulesByType[type].maxBytes
+}
+
 export const artworkRenditionSlotSchema = z.enum(["thumbnail", "card", "full", "retina", "custom"])
 
 export const createMediaAssetInputSchema = z.object({