On server config route, add OIDC config

geneit_backend/src/controllers/server_controller.rs

@@ -0,0 +1,30 @@
+use crate::app_config::{AppConfig, OIDCProvider};
+use crate::constants::StaticConstraints;
+use actix_web::{HttpResponse, Responder};
+
+/// Default hello route
+pub async fn home() -> impl Responder {
+    HttpResponse::Ok().json("GeneIT API service.")
+}
+
+#[derive(Debug, Clone, serde::Serialize)]
+struct ServerConfig {
+    constraints: StaticConstraints,
+    mail: &'static str,
+    oidc_providers: Vec<OIDCProvider>,
+}
+
+impl Default for ServerConfig {
+    fn default() -> Self {
+        Self {
+            mail: AppConfig::get().mail_sender.as_str(),
+            constraints: StaticConstraints::default(),
+            oidc_providers: AppConfig::get().openid_providers(),
+        }
+    }
+}
+
+/// Get server configuration
+pub async fn server_config() -> impl Responder {
+    HttpResponse::Ok().json(ServerConfig::default())
+}