Add oidc-provider-mock dev setup with docker-compose and dotenvy

- docker-compose.yml runs oidc-provider-mock on :9400 with predefined
  alice/bob users carrying preferred_username claims
- .env auto-loaded via dotenvy for zero-config local dev
- index route now redirects unauthenticated users to the login flow
  instead of returning 401

.env.example

@@ -1,9 +1,12 @@
-# Base URL of the OIDC provider (e.g. Keycloak realm URL)
-OIDC_PROVIDER_URL=http://localhost:8080
+# Base URL of the OIDC provider.
+# For local development, `docker-compose up -d` starts oidc-provider-mock
+# at http://localhost:9400 (accepts any client ID/secret).
+# For Keycloak use e.g. https://keycloak.example.com/realms/myrealm
+OIDC_PROVIDER_URL=http://localhost:9400
 
 # OAuth2 client credentials (required)
-OIDC_CLIENT_ID=your-client-id
-OIDC_CLIENT_SECRET=your-client-secret
+OIDC_CLIENT_ID=dev-client
+OIDC_CLIENT_SECRET=dev-secret
 
 # Full callback URL — must match the redirect URI configured at the provider
 OIDC_REDIRECT_URI=http://localhost:3000/auth/callback

Cargo.lock

@@ -216,6 +216,7 @@ dependencies = [
  "axum",
  "axum-oidc-client",
  "base64",
+ "dotenvy",
  "serde",
  "serde_json",
  "tokio",

Cargo.toml

@@ -11,3 +11,4 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 base64 = "0.22"
 anyhow = "1"
+dotenvy = "0.15"

docker-compose.yml

@@ -0,0 +1,10 @@
+services:
+  oidc:
+    image: ghcr.io/geigerzaehler/oidc-provider-mock:latest
+    ports:
+      - "9400:9400"
+    command:
+      - --user-claims
+      - '{"sub": "alice", "preferred_username": "alice", "email": "alice@example.com", "name": "Alice"}'
+      - --user-claims
+      - '{"sub": "bob", "preferred_username": "bob", "email": "bob@example.com", "name": "Bob"}'

src/main.rs

@@ -1,13 +1,20 @@
 use std::env;
 use std::sync::Arc;
 
-use axum::{http::StatusCode, response::Html, routing::get, Json, Router};
+use axum::{
+    extract::State,
+    http::StatusCode,
+    response::{Html, IntoResponse, Redirect, Response},
+    routing::get,
+    Json, Router,
+};
 use axum_oidc_client::authentication::AuthenticationLayer;
 use axum_oidc_client::authentication::builder::OAuthConfigurationBuilder;
 use axum_oidc_client::authentication::logout::handle_default_logout::DefaultLogoutHandler;
 use axum_oidc_client::auth_cache::AuthCache;
 use axum_oidc_client::auth_session::AuthSession;
 use axum_oidc_client::cache::{TwoTierAuthCache, config::TwoTierCacheConfig};
+use axum_oidc_client::extractors::OptionalAuthSession;
 use axum_oidc_client::sql_cache::{SqlAuthCache, SqlCacheConfig};
 use axum_oidc_client::authentication::CodeChallengeMethod;
 use base64::Engine;
@@ -78,12 +85,22 @@ async fn hello(session: AuthSession) -> Result<Json<HelloResponse>, StatusCode>
     Ok(Json(HelloResponse { preferred_username }))
 }
 
-async fn index(_session: AuthSession) -> Html<&'static str> {
-    Html(INDEX_HTML)
+#[derive(Clone)]
+struct AppState {
+    login_path: String,
+}
+
+async fn index(session: OptionalAuthSession, State(state): State<AppState>) -> Response {
+    match session.0 {
+        Some(_) => Html(INDEX_HTML).into_response(),
+        None => Redirect::to(&state.login_path).into_response(),
+    }
 }
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
+    dotenvy::dotenv().ok();
+
     let provider_url = env_required("OIDC_PROVIDER_URL");
     let client_id = env_required("OIDC_CLIENT_ID");
     let client_secret = env_required("OIDC_CLIENT_SECRET");
@@ -131,7 +148,10 @@ async fn main() -> anyhow::Result<()> {
             Arc::new(config),
             cache,
             logout_handler,
-        ));
+        ))
+        .with_state(AppState {
+            login_path: auth_base_path,
+        });
 
     let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await?;
     println!("Listening on http://0.0.0.0:3000");