feat(notification): add plugin (#326)

plugins/notification/src/models.rs

@@ -0,0 +1,48 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+use std::fmt::Display;
+
+use serde::{de::Error as DeError, Deserialize, Deserializer, Serialize, Serializer};
+
+/// Permission state.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum PermissionState {
+    /// Permission access has been granted.
+    Granted,
+    /// Permission access has been denied.
+    Denied,
+}
+
+impl Display for PermissionState {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::Granted => write!(f, "granted"),
+            Self::Denied => write!(f, "denied"),
+        }
+    }
+}
+
+impl Serialize for PermissionState {
+    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(self.to_string().as_ref())
+    }
+}
+
+impl<'de> Deserialize<'de> for PermissionState {
+    fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let s = String::deserialize(deserializer)?;
+        match s.to_lowercase().as_str() {
+            "granted" => Ok(Self::Granted),
+            "denied" => Ok(Self::Denied),
+            _ => Err(DeError::custom(format!("unknown permission state '{s}'"))),
+        }
+    }
+}