Add 'CalendarrKit/' from commit '9ea1a8705d608b1aa476c0b35685c57466bb0c50'

git-subtree-dir: CalendarrKit
git-subtree-mainline: 8bc32faa7f
git-subtree-split: 9ea1a8705d

CalendarrKit/Sources/CalendarrCore/AppGroup.swift

@@ -0,0 +1,31 @@
+import Foundation
+
+/// The App Group the Calendarr apps share.
+///
+/// The identifier registered in the Apple Developer portal never changes. What
+/// changes is the string the *runtime* expects: macOS — including Mac Catalyst —
+/// requires the Team ID prefix, and iOS forbids it.
+///
+/// Getting this wrong fails silently. `containerURL(forSecurityApplication‑
+/// GroupIdentifier:)` returns nil, every read and write no-ops, and widgets show
+/// placeholder content forever with no error raised anywhere. `current` must
+/// therefore stay byte-identical to `com.apple.security.application-groups` in
+/// the entitlements file used for the platform being built.
+public enum CalendarrAppGroup {
+    /// As registered in the Apple Developer portal.
+    public static let unprefixed = "group.com.scarriffleservices.calendarr"
+
+    /// Team ID — the value `$(AppIdentifierPrefix)` expands to at build time.
+    public static let teamID = "PP34X97WS3"
+
+    /// The value to hand to `FileManager.containerURL(forSecurityApplicationGroupIdentifier:)`.
+    #if os(macOS) || targetEnvironment(macCatalyst)
+    public static let current = "\(teamID).\(unprefixed)"
+    #else
+    public static let current = unprefixed
+    #endif
+
+    /// Keychain access group shared across apps from this team. Requires
+    /// `keychain-access-groups` in the entitlements of every app that uses it.
+    public static let sharedKeychainGroup = "\(teamID).com.scarriffleservices.calendarr.shared"
+}