Implement almost all previous features

crates/frontend/src/oidc_user_store.rs

@@ -0,0 +1,37 @@
+use std::sync::Arc;
+
+use async_trait::async_trait;
+use rustical_oidc::UserStore;
+use rustical_store::auth::{AuthenticationProvider, User};
+
+pub struct OidcUserStore<AP: AuthenticationProvider>(pub Arc<AP>);
+
+impl<AP: AuthenticationProvider> Clone for OidcUserStore<AP> {
+    fn clone(&self) -> Self {
+        Self(self.0.clone())
+    }
+}
+
+#[async_trait]
+impl<AP: AuthenticationProvider> UserStore for OidcUserStore<AP> {
+    type Error = rustical_store::Error;
+
+    async fn user_exists(&self, id: &str) -> Result<bool, Self::Error> {
+        Ok(self.0.get_principal(id).await?.is_some())
+    }
+
+    async fn insert_user(&self, id: &str) -> Result<(), Self::Error> {
+        self.0
+            .insert_principal(
+                User {
+                    id: id.to_owned(),
+                    displayname: None,
+                    principal_type: Default::default(),
+                    password: None,
+                    memberships: vec![],
+                },
+                false,
+            )
+            .await
+    }
+}