auth: add safari-auth plugin for iOS OAuth (#433)

* auth: add safari-auth plugin for iOS OAuth

* fix: temporarily disable email auth provider for iOS

apps/readest-app/src-tauri/plugins/tauri-plugin-safari-auth/src/commands.rs

@@ -0,0 +1,13 @@
+use tauri::{command, AppHandle, Runtime};
+
+use crate::models::*;
+use crate::Result;
+use crate::SafariAuthExt;
+
+#[command]
+pub(crate) async fn auth_with_safari<R: Runtime>(
+    app: AppHandle<R>,
+    payload: SafariAuthRequest,
+) -> Result<SafariAuthResponse> {
+    app.safari_auth().auth_with_safari(payload)
+}

apps/readest-app/src-tauri/plugins/tauri-plugin-safari-auth/src/desktop.rs

@@ -0,0 +1,23 @@
+use serde::de::DeserializeOwned;
+use tauri::{plugin::PluginApi, AppHandle, Runtime};
+
+use crate::models::*;
+
+pub fn init<R: Runtime, C: DeserializeOwned>(
+    app: &AppHandle<R>,
+    _api: PluginApi<R, C>,
+) -> crate::Result<SafariAuth<R>> {
+    Ok(SafariAuth(app.clone()))
+}
+
+/// Access to the safari-auth APIs.
+pub struct SafariAuth<R: Runtime>(AppHandle<R>);
+
+impl<R: Runtime> SafariAuth<R> {
+    pub fn auth_with_safari(
+        &self,
+        _payload: SafariAuthRequest,
+    ) -> crate::Result<SafariAuthResponse> {
+        Err(crate::Error::UnsupportedPlatformError)
+    }
+}

apps/readest-app/src-tauri/plugins/tauri-plugin-safari-auth/src/error.rs

@@ -0,0 +1,23 @@
+use serde::{ser::Serializer, Serialize};
+
+pub type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("Unsupported platform for this plugin")]
+    UnsupportedPlatformError,
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+    #[cfg(mobile)]
+    #[error(transparent)]
+    PluginInvoke(#[from] tauri::plugin::mobile::PluginInvokeError),
+}
+
+impl Serialize for Error {
+    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(self.to_string().as_ref())
+    }
+}

apps/readest-app/src-tauri/plugins/tauri-plugin-safari-auth/src/lib.rs

@@ -0,0 +1,48 @@
+use tauri::{
+    plugin::{Builder, TauriPlugin},
+    Manager, Runtime,
+};
+
+pub use models::*;
+
+#[cfg(desktop)]
+mod desktop;
+#[cfg(mobile)]
+mod mobile;
+
+mod commands;
+mod error;
+mod models;
+
+pub use error::{Error, Result};
+
+#[cfg(desktop)]
+use desktop::SafariAuth;
+#[cfg(mobile)]
+use mobile::SafariAuth;
+
+/// Extensions to [`tauri::App`], [`tauri::AppHandle`] and [`tauri::Window`] to access the safari-auth APIs.
+pub trait SafariAuthExt<R: Runtime> {
+    fn safari_auth(&self) -> &SafariAuth<R>;
+}
+
+impl<R: Runtime, T: Manager<R>> crate::SafariAuthExt<R> for T {
+    fn safari_auth(&self) -> &SafariAuth<R> {
+        self.state::<SafariAuth<R>>().inner()
+    }
+}
+
+/// Initializes the plugin.
+pub fn init<R: Runtime>() -> TauriPlugin<R> {
+    Builder::new("safari-auth")
+        .invoke_handler(tauri::generate_handler![commands::auth_with_safari])
+        .setup(|app, api| {
+            #[cfg(mobile)]
+            let safari_auth = mobile::init(app, api)?;
+            #[cfg(desktop)]
+            let safari_auth = desktop::init(app, api)?;
+            app.manage(safari_auth);
+            Ok(())
+        })
+        .build()
+}

apps/readest-app/src-tauri/plugins/tauri-plugin-safari-auth/src/mobile.rs

@@ -0,0 +1,34 @@
+use serde::de::DeserializeOwned;
+use tauri::{
+    plugin::{PluginApi, PluginHandle},
+    AppHandle, Runtime,
+};
+
+use crate::models::*;
+
+#[cfg(target_os = "ios")]
+tauri::ios_plugin_binding!(init_plugin_safari_auth);
+
+// initializes the Kotlin or Swift plugin classes
+pub fn init<R: Runtime, C: DeserializeOwned>(
+    _app: &AppHandle<R>,
+    api: PluginApi<R, C>,
+) -> crate::Result<SafariAuth<R>> {
+    #[cfg(target_os = "ios")]
+    let handle = api.register_ios_plugin(init_plugin_safari_auth)?;
+    Ok(SafariAuth(handle))
+}
+
+/// Access to the safari-auth APIs.
+pub struct SafariAuth<R: Runtime>(PluginHandle<R>);
+
+impl<R: Runtime> SafariAuth<R> {
+    pub fn auth_with_safari(
+        &self,
+        payload: SafariAuthRequest,
+    ) -> crate::Result<SafariAuthResponse> {
+        self.0
+            .run_mobile_plugin("auth_with_safari", payload)
+            .map_err(Into::into)
+    }
+}

apps/readest-app/src-tauri/plugins/tauri-plugin-safari-auth/src/models.rs

@@ -0,0 +1,13 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SafariAuthRequest {
+    pub auth_url: String,
+}
+
+#[derive(Debug, Clone, Default, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SafariAuthResponse {
+    pub redirect_url: String,
+}