fix(ui): restrict file picking via upload config mimetypes (#8710)

Fixes #8673

This PR restricts inputs with `type="file"` to only those mimetypes
specified in collection upload configs. This also works for the input in
`bulkUpload` and drag-and-drop capabilities by omitting dropped files if
they do not conform to the upload config mimetypes. This PR also assumes
that an upload config with an empty mimetype array should accept all
files since the negation of that statement makes an upload collection
redundant.

packages/ui/src/elements/BulkUpload/AddFilesView/index.tsx

@@ -11,10 +11,11 @@ import './index.scss'
 const baseClass = 'bulk-upload--add-files'
 
 type Props = {
+  readonly acceptMimeTypes?: string
   readonly onCancel: () => void
   readonly onDrop: (acceptedFiles: FileList) => void
 }
-export function AddFilesView({ onCancel, onDrop }: Props) {
+export function AddFilesView({ acceptMimeTypes, onCancel, onDrop }: Props) {
   const { t } = useTranslation()
 
   const inputRef = React.useRef(null)
@@ -37,6 +38,7 @@ export function AddFilesView({ onCancel, onDrop }: Props) {
             {t('upload:selectFile')}
           </Button>
           <input
+            accept={acceptMimeTypes}
             aria-hidden="true"
             className={`${baseClass}__hidden-input`}
             hidden

packages/ui/src/elements/BulkUpload/index.tsx

@@ -5,6 +5,7 @@ import type { JsonObject } from 'payload'
 import { useModal } from '@faceless-ui/modal'
 import React from 'react'
 
+import { useConfig } from '../../providers/Config/index.js'
 import { EditDepthProvider, useEditDepth } from '../../providers/EditDepth/index.js'
 import { Drawer } from '../Drawer/index.js'
 import { AddFilesView } from './AddFilesView/index.js'
@@ -17,12 +18,27 @@ function DrawerContent() {
   const { addFiles, forms, isInitializing } = useFormsManager()
   const { closeModal } = useModal()
   const { collectionSlug, drawerSlug } = useBulkUpload()
+  const { config } = useConfig()
+
+  const uploadCollection = config.collections.find((col) => col.slug === collectionSlug)
+  const uploadConfig = uploadCollection.upload
+  const uploadMimeTypes = uploadConfig.mimeTypes
 
   const onDrop = React.useCallback(
     (acceptedFiles: FileList) => {
-      void addFiles(acceptedFiles)
+      const fileTransfer = new DataTransfer()
+      for (const candidateFile of acceptedFiles) {
+        if (
+          uploadMimeTypes === undefined ||
+          uploadMimeTypes.length === 0 ||
+          uploadMimeTypes?.includes(candidateFile.type)
+        ) {
+          fileTransfer.items.add(candidateFile)
+        }
+      }
+      void addFiles(fileTransfer.files)
     },
-    [addFiles],
+    [addFiles, uploadMimeTypes],
   )
 
   if (!collectionSlug) {
@@ -30,7 +46,13 @@ function DrawerContent() {
   }
 
   if (!forms.length && !isInitializing) {
-    return <AddFilesView onCancel={() => closeModal(drawerSlug)} onDrop={onDrop} />
+    return (
+      <AddFilesView
+        acceptMimeTypes={uploadMimeTypes?.join(', ')}
+        onCancel={() => closeModal(drawerSlug)}
+        onDrop={onDrop}
+      />
+    )
   } else {
     return <AddingFilesView />
   }