feat(permissions): add webdav permissions parser

Signed-off-by: John Molakvoæ <skjnldsv@protonmail.com>

__tests__/permissions.spec.js

@@ -0,0 +1,27 @@
+import { parseWebdavPermissions, Permission } from '../lib/permissions'
+
+const dataSet = [
+	{ input: '-', permissions: Permission.NONE },
+	{ input: 'C', permissions: Permission.CREATE },
+	{ input: 'K', permissions: Permission.CREATE },
+	{ input: 'G', permissions: Permission.READ },
+	{ input: 'W', permissions: Permission.UPDATE },
+	{ input: 'N', permissions: Permission.UPDATE },
+	{ input: 'V', permissions: Permission.UPDATE },
+	{ input: 'D', permissions: Permission.DELETE },
+	{ input: 'R', permissions: Permission.SHARE },
+	{ input: 'CKGW', permissions: Permission.CREATE | Permission.READ | Permission.UPDATE },
+	{ input: 'GR', permissions: Permission.READ | Permission.SHARE },
+	{ input: 'GD', permissions: Permission.READ | Permission.DELETE },
+	{ input: 'RGDNVW', permissions: Permission.UPDATE | Permission.READ | Permission.DELETE | Permission.SHARE },
+	{ input: 'RGDNVCK', permissions: Permission.UPDATE | Permission.READ | Permission.DELETE | Permission.CREATE | Permission.SHARE },
+]
+
+describe('parseWebdavPermissions', () => {
+
+	dataSet.forEach(({ input, permissions }) => {
+		it(`expect ${input} to be ${permissions}`, () => {
+			expect(parseWebdavPermissions(input)).toBe(permissions)
+		})
+	})
+})

lib/permissions.ts

@@ -30,3 +30,28 @@ export enum Permission {
 	SHARE = 16,
 	ALL = 31,
 }
+
+/**
+ * Parse the webdav permission string to a permission enum
+ * @see https://github.com/nextcloud/server/blob/71f698649f578db19a22457cb9d420fb62c10382/lib/public/Files/DavUtil.php#L58-L88
+ */
+export const parseWebdavPermissions = function(permString: string = 'CK'): number {
+	let permissions = Permission.NONE
+
+	if (permString.includes('C') || permString.includes('K'))
+		permissions |= Permission.CREATE
+
+	if (permString.includes('G'))
+		permissions |= Permission.READ
+
+	if (permString.includes('W') || permString.includes('N') || permString.includes('V'))
+		permissions |= Permission.UPDATE
+
+	if (permString.includes('D'))
+		permissions |= Permission.DELETE
+
+	if (permString.includes('R'))
+		permissions |= Permission.SHARE
+
+	return permissions
+}