feat(updater): add plugin (#350)

Co-authored-by: Fabian-Lars <fabianlars@fabianlars.de>

plugins/updater/src/lib.rs

@@ -0,0 +1,77 @@
+use tauri::{
+    plugin::{Builder as PluginBuilder, TauriPlugin},
+    Manager, Runtime,
+};
+
+use tokio::sync::Mutex;
+
+mod commands;
+mod error;
+mod updater;
+
+pub use error::Error;
+pub use updater::*;
+pub type Result<T> = std::result::Result<T, Error>;
+
+struct UpdaterState {
+    target: Option<String>,
+}
+
+struct PendingUpdate<R: Runtime>(Mutex<Option<UpdateResponse<R>>>);
+
+#[derive(Default)]
+pub struct Builder {
+    target: Option<String>,
+}
+
+/// Extension trait to use the updater on [`tauri::App`], [`tauri::AppHandle`] and [`tauri::Window`].
+pub trait UpdaterExt<R: Runtime> {
+    /// Gets the updater builder to manually check if an update is available.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use tauri_plugin_updater::UpdaterExt;
+    /// tauri::Builder::default()
+    ///   .setup(|app| {
+    ///     let handle = app.handle();
+    ///     tauri::async_runtime::spawn(async move {
+    ///         let response = handle.updater().check().await;
+    ///     });
+    ///     Ok(())
+    ///   });
+    /// ```
+    fn updater(&self) -> updater::UpdateBuilder<R>;
+}
+
+impl<R: Runtime, T: Manager<R>> UpdaterExt<R> for T {
+    fn updater(&self) -> updater::UpdateBuilder<R> {
+        updater::builder(self.app_handle())
+    }
+}
+
+impl Builder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn target(mut self, target: impl Into<String>) -> Self {
+        self.target.replace(target.into());
+        self
+    }
+
+    pub fn build<R: Runtime>(self) -> TauriPlugin<R> {
+        let target = self.target;
+        PluginBuilder::<R>::new("updater")
+            .setup(move |app, _api| {
+                app.manage(UpdaterState { target });
+                app.manage(PendingUpdate::<R>(Default::default()));
+                Ok(())
+            })
+            .invoke_handler(tauri::generate_handler![
+                commands::check,
+                commands::download_and_install
+            ])
+            .build()
+    }
+}