feat: implement RFS client with authentication and file management APIs

packages/clients/rfsclient/examples/authentication.rs

@@ -0,0 +1,42 @@
+use sal_rfs_client::RfsClient;
+use sal_rfs_client::types::{ClientConfig, Credentials};
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Create a client with authentication credentials
+    let config = ClientConfig {
+        base_url: "http://localhost:8080".to_string(),
+        credentials: Some(Credentials {
+            username: "user".to_string(),
+            password: "password".to_string(),
+        }),
+        timeout_seconds: 30,
+    };
+    
+    let mut client = RfsClient::new(config);
+    println!("Client created with authentication credentials");
+    
+    // Authenticate with the server
+    client.authenticate().await?;
+    if client.is_authenticated() {
+        println!("Authentication successful");
+    } else {
+        println!("Authentication failed");
+    }
+
+    // Create a client without authentication
+    let config_no_auth = ClientConfig {
+        base_url: "http://localhost:8080".to_string(),
+        credentials: None,
+        timeout_seconds: 30,
+    };
+    
+    let client_no_auth = RfsClient::new(config_no_auth);
+    println!("Client created without authentication credentials");
+    
+    // Check health endpoint (doesn't require authentication)
+    let health = client_no_auth.health_check().await?;
+    println!("Server health: {:?}", health);
+    
+    Ok(())
+}