1 files changed, 71 insertions, 0 deletions
diff --git a/apps/files/src/actions/moveOrCopyActionUtils.ts b/apps/files/src/actions/moveOrCopyActionUtils.ts
new file mode 100644
index 00000000000..0372e8f4bc7
--- /dev/null
+++ b/apps/files/src/actions/moveOrCopyActionUtils.ts
@@ -0,0 +1,71 @@
+/**
+ * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+import type { Folder, Node } from '@nextcloud/files'
+import type { ShareAttribute } from '../../../files_sharing/src/sharing'
+
+import { Permission } from '@nextcloud/files'
+import { isPublicShare } from '@nextcloud/sharing/public'
+import PQueue from 'p-queue'
+import { loadState } from '@nextcloud/initial-state'
+
+const sharePermissions = loadState<number>('files_sharing', 'sharePermissions', Permission.NONE)
+
+// This is the processing queue. We only want to allow 3 concurrent requests
+let queue: PQueue
+
+// Maximum number of concurrent operations
+const MAX_CONCURRENCY = 5
+
+/**
+ * Get the processing queue
+ */
+export const getQueue = () => {
+	if (!queue) {
+		queue = new PQueue({ concurrency: MAX_CONCURRENCY })
+	}
+	return queue
+}
+
+export enum MoveCopyAction {
+	MOVE = 'Move',
+	COPY = 'Copy',
+	MOVE_OR_COPY = 'move-or-copy',
+}
+
+export type MoveCopyResult = {
+	destination: Folder
+	action: MoveCopyAction.COPY | MoveCopyAction.MOVE
+}
+
+export const canMove = (nodes: Node[]) => {
+	const minPermission = nodes.reduce((min, node) => Math.min(min, node.permissions), Permission.ALL)
+	return Boolean(minPermission & Permission.DELETE)
+}
+
+export const canDownload = (nodes: Node[]) => {
+	return nodes.every(node => {
+		const shareAttributes = JSON.parse(node.attributes?.['share-attributes'] ?? '[]') as Array<ShareAttribute>
+		return !shareAttributes.some(attribute => attribute.scope === 'permissions' && attribute.value === false && attribute.key === 'download')
+
+	})
+}
+
+export const canCopy = (nodes: Node[]) => {
+	// a shared file cannot be copied if the download is disabled
+	if (!canDownload(nodes)) {
+		return false
+	}
+	// it cannot be copied if the user has only view permissions
+	if (nodes.some((node) => node.permissions === Permission.NONE)) {
+		return false
+	}
+	// on public shares all files have the same permission so copy is only possible if write permission is granted
+	if (isPublicShare()) {
+		return Boolean(sharePermissions & Permission.CREATE)
+	}
+	// otherwise permission is granted
+	return true
+}