R2 storage from env + filename normalization

src/modules/media/index.ts

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+export { normalizeFilename, normalizeFilenameHook } from './normalizeFilename.js'

src/modules/media/normalizeFilename.ts

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+import type { CollectionBeforeOperationHook } from 'payload'
+import slugify from 'slugify'
+
+/**
+ * Normalizes a filename: slugifies the NAME part (diacritics, spaces, case)
+ * while preserving the extension. Keeps uploaded media URLs clean and portable.
+ *
+ *   "Zdjęcie jeden nad morzem.jpg"  → "zdjecie-jeden-nad-morzem.jpg"
+ *   "Faktura #12 (2024).PDF"        → "faktura-12-2024.pdf"
+ *   "already-clean.webp"            → "already-clean.webp"
+ *
+ * Why not toSlug(): toSlug uses strict:true, which would strip the dot and
+ * merge name+extension. Here we split on the LAST dot, slug the stem, lowercase
+ * the extension, and rejoin.
+ */
+export function normalizeFilename(filename: string): string {
+  const lastDot = filename.lastIndexOf('.')
+
+  // No extension (or leading-dot dotfile) → slug the whole thing.
+  if (lastDot <= 0) {
+    return slugify(filename, { lower: true, strict: true, trim: true })
+  }
+
+  const stem = filename.slice(0, lastDot)
+  const ext = filename.slice(lastDot + 1).toLowerCase()
+
+  const cleanStem = slugify(stem, { lower: true, strict: true, trim: true })
+  const cleanExt = slugify(ext, { lower: true, strict: true, trim: true })
+
+  // Stem could slug to empty (e.g. filename was all symbols) — fall back so we
+  // never produce a nameless file.
+  const safeStem = cleanStem || 'plik'
+
+  return cleanExt ? `${safeStem}.${cleanExt}` : safeStem
+}
+
+/**
+ * beforeOperation hook for an upload collection (e.g. Media). Rewrites the
+ * incoming file's name to its normalized form before Payload stores it, so both
+ * the stored file and its DB filename are clean. Works with local disk and with
+ * cloud storage adapters (R2/S3) — it runs before the storage layer.
+ *
+ * Wire into your Media collection:
+ *   import { normalizeFilenameHook } from '@intecion/ipal-kit'
+ *   hooks: { beforeOperation: [normalizeFilenameHook] }
+ */
+export const normalizeFilenameHook: CollectionBeforeOperationHook = ({ req, operation }) => {
+  if (operation !== 'create' && operation !== 'update') return
+  const file = req.file
+  if (file?.name) {
+    file.name = normalizeFilename(file.name)
+  }
+}