Middleware+View+UserState: Add toast messages

Sources/App/UserState/ToastState.swift

@@ -0,0 +1,15 @@
+public struct ToastState: Sendable {
+
+    enum Level: String {
+        case success = "success"
+        case error = "danger"
+        case warning = "warning"
+        case info = "info"
+        case verbose = "secondary"
+    }
+
+    var message: String = ""
+    var title: String = ""
+    var level: Level = Level.verbose
+
+}

Sources/App/UserState/UserState.swift

@@ -0,0 +1,32 @@
+import Vapor
+
+// -----------------------------------------
+
+public final class UserState: @unchecked Sendable {
+	var toast: ToastState = ToastState()
+}
+
+// -----------------------------------------
+
+struct UserStateKey: StorageKey {
+    typealias Value = UserState
+}
+
+struct UserStateManager: Sendable {
+	var states: [String: UserState] = [:]
+}
+
+struct UserStateManagerKey : StorageKey {
+	typealias Value = UserStateManager
+}
+
+extension Application {
+    var manager: UserStateManager {
+        get {
+            self.storage[UserStateManagerKey.self]!
+        }
+        set {
+            self.storage[UserStateManagerKey.self] = newValue
+        }
+    }
+}