feat(camera): add plugin for Android and iOS

plugins/camera/src/lib.rs

@@ -0,0 +1,60 @@
+// Copyright 2019-2022 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+#![cfg(mobile)]
+
+use tauri::{
+  plugin::{Builder, PluginHandle, TauriPlugin},
+  Manager, Runtime,
+};
+
+pub use models::*;
+mod error;
+pub mod models;
+pub use error::*;
+
+#[cfg(target_os = "android")]
+const PLUGIN_IDENTIFIER: &str = "app.tauri.camera";
+
+#[cfg(target_os = "ios")]
+extern "C" {
+  fn init_plugin_camera(webview: tauri::cocoa::base::id);
+}
+
+/// A helper class to access the mobile camera APIs.
+pub struct Camera<R: Runtime>(PluginHandle<R>);
+
+impl<R: Runtime> Camera<R> {
+  pub fn get_photo(&self, options: ImageOptions) -> Result<Image> {
+    self
+      .0
+      .run_mobile_plugin("getPhoto", options)
+      .map_err(Into::into)
+  }
+}
+
+/// Extensions to [`tauri::App`], [`tauri::AppHandle`] and [`tauri::Window`] to access the camera APIs.
+pub trait CameraExt<R: Runtime> {
+  fn camera(&self) -> &Camera<R>;
+}
+
+impl<R: Runtime, T: Manager<R>> CameraExt<R> for T {
+  fn camera(&self) -> &Camera<R> {
+    self.state::<Camera<R>>().inner()
+  }
+}
+
+/// Initializes the plugin.
+pub fn init<R: Runtime>() -> TauriPlugin<R> {
+  Builder::new("camera")
+    .setup(|app, api| {
+      #[cfg(target_os = "android")]
+      let handle = api.register_android_plugin(PLUGIN_IDENTIFIER, "CameraPlugin")?;
+      #[cfg(target_os = "ios")]
+      let handle = api.register_ios_plugin(init_plugin_camera)?;
+      app.manage(Camera(handle));
+      Ok(())
+    })
+    .build()
+}