Add Authorizer Api with NoopAuthorizer.

Author: G8XSU

rust/api/src/auth.rs

@@ -0,0 +1,30 @@
+use crate::error::VssError;
+use async_trait::async_trait;
+use std::collections::HashMap;
+use std::string::ToString;
+
+#[derive(Debug, Clone)]
+pub struct AuthResponse {
+	pub user_token: String,
+}
+
+// Interface for authorizer that is run before every request.
+#[async_trait]
+pub trait Authorizer: Send + Sync {
+	async fn verify(&self, headers_map: &HashMap<String, String>)
+		-> Result<AuthResponse, VssError>;
+}
+
+// A no-operation authorizer, that lets any user-request go through.
+pub struct NoopAuthorizer {}
+
+const UNAUTHENTICATED_USER: &str = "unauth-user";
+
+#[async_trait]
+impl Authorizer for NoopAuthorizer {
+	async fn verify(
+		&self, _headers_map: &HashMap<String, String>,
+	) -> Result<AuthResponse, VssError> {
+		Ok(AuthResponse { user_token: UNAUTHENTICATED_USER.to_string().clone() })
+	}
+}

rust/api/src/lib.rs

@@ -1,3 +1,4 @@
+pub mod auth;
 pub mod error;
 pub mod kv_store;
 pub mod types;