feat: Nextcloud share permission OptionSet.

- Moved NKShare into dedicated source code file.
- Added documentation comments.
- Introduced OptionSet for bitmask operations in share permissions which previously were implemented in projects using this library.
- OptionSets are the conventional way to work with bit masks in Swift.

Signed-off-by: Iva Horn <iva.horn@nextcloud.com>

Author: i2h3

Sources/NextcloudKit/Models/NKShare.swift

@@ -0,0 +1,93 @@
+//  SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+//  SPDX-License-Identifier: GPL-3.0-or-later
+
+import Foundation
+
+///
+/// Represents a Nextcloud share with its associated properties and permissions.
+///
+public final class NKShare: NSObject {
+    ///
+    /// Bitmask values defining share permissions as used in ``NKShare\\permissions``.
+    ///
+    /// As defined in the [OCS Share API documentation](https://docs.nextcloud.com/server/latest/developer_manual/client_apis/OCS/ocs-share-api.html).
+    ///
+    public struct Permission: OptionSet {
+        public let rawValue: Int
+
+        public init(rawValue: Int) {
+            self.rawValue = rawValue
+        }
+
+        /// Access the shared item.
+        /// Default value for public shares.
+        public static let read = Permission(rawValue: 1)
+
+        /// Edit the shared items.
+        public static let update = Permission(rawValue: 2)
+
+        /// Create the shared items.
+        public static let create = Permission(rawValue: 4)
+
+        /// Delete the shared items.
+        public static let delete = Permission(rawValue: 8)
+
+        /// Reshare the shared items.
+        public static let share = Permission(rawValue: 16)
+
+        /// Default value except for public shares.
+        public static let all: Permission = [.read, .update, .create, .delete, .share]
+
+        /// Determine the default permission value based on the given type value.
+        public static func defaultPermission(for type: Int) -> Permission {
+            if type == 3 {
+                return .read
+            } else {
+                return .all
+            }
+        }
+    }
+
+    public var account = ""
+    public var canEdit: Bool = false
+    public var canDelete: Bool = false
+    public var date: Date?
+    public var displaynameFileOwner = ""
+    public var displaynameOwner = ""
+    public var expirationDate: NSDate?
+    public var fileParent: Int = 0
+    public var fileSource: Int = 0
+    public var fileTarget = ""
+    public var hideDownload: Bool = false
+    public var idShare: Int = 0
+    public var itemSource: Int = 0
+    public var itemType = ""
+    public var label = ""
+    public var mailSend: Bool = false
+    public var mimeType = ""
+    public var note = ""
+    public var parent = ""
+    public var password = ""
+    public var path = ""
+
+    ///
+    /// See ``Permission`` for possible bitmask values.
+    ///
+    public var permissions: Int = 0
+
+    public var sendPasswordByTalk: Bool = false
+    public var shareType: Int = 0
+    public var shareWith = ""
+    public var shareWithDisplayname = ""
+    public var storage: Int = 0
+    public var storageId = ""
+    public var token = ""
+    public var uidFileOwner = ""
+    public var uidOwner = ""
+    public var url = ""
+    public var userClearAt: Date?
+    public var userIcon = ""
+    public var userMessage = ""
+    public var userStatus = ""
+    public var attributes: String?
+}

Sources/NextcloudKit/NextcloudKit+Share.swift

@@ -690,43 +690,3 @@ public extension NextcloudKit {
         return share
     }
 }
-
-public class NKShare: NSObject {
-    public var account = ""
-    public var canEdit: Bool = false
-    public var canDelete: Bool = false
-    public var date: Date?
-    public var displaynameFileOwner = ""
-    public var displaynameOwner = ""
-    public var expirationDate: NSDate?
-    public var fileParent: Int = 0
-    public var fileSource: Int = 0
-    public var fileTarget = ""
-    public var hideDownload: Bool = false
-    public var idShare: Int = 0
-    public var itemSource: Int = 0
-    public var itemType = ""
-    public var label = ""
-    public var mailSend: Bool = false
-    public var mimeType = ""
-    public var note = ""
-    public var parent = ""
-    public var password = ""
-    public var path = ""
-    public var permissions: Int = 0
-    public var sendPasswordByTalk: Bool = false
-    public var shareType: Int = 0
-    public var shareWith = ""
-    public var shareWithDisplayname = ""
-    public var storage: Int = 0
-    public var storageId = ""
-    public var token = ""
-    public var uidFileOwner = ""
-    public var uidOwner = ""
-    public var url = ""
-    public var userClearAt: Date?
-    public var userIcon = ""
-    public var userMessage = ""
-    public var userStatus = ""
-    public var attributes: String?
-}