Add Authorizer Api with NoopAuthorizer.

Author: G8XSU

rust/api/src/auth.rs

@@ -0,0 +1,35 @@
+use crate::error::VssError;
+use async_trait::async_trait;
+use std::collections::HashMap;
+use std::string::ToString;
+
+/// Response returned for [`Authorizer`] request if user is authenticated and authorized.
+#[derive(Debug, Clone)]
+pub struct AuthResponse {
+	/// A `user_token` identifying the authenticated and authorized user.
+	pub user_token: String,
+}
+
+/// Interface for authorizer that is run before executing every request.
+#[async_trait]
+pub trait Authorizer: Send + Sync {
+	/// Verifies authentication and authorization based on request headers.
+	/// Returns [`AuthResponse`] for an authenticated and authorized user or [`VssError::AuthError`]
+	/// for an unauthorized request.
+	async fn verify(&self, headers_map: &HashMap<String, String>)
+		-> Result<AuthResponse, VssError>;
+}
+
+/// A no-operation authorizer, which 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() })
+	}
+}

rust/api/src/lib.rs

@@ -9,6 +9,8 @@
 #![deny(rustdoc::private_intra_doc_links)]
 #![deny(missing_docs)]
 
+/// Contains interface for authorizer that is run before every request, and its corresponding implementations.
+pub mod auth;
 /// Implements the error type ([`error::VssError`]) which is eventually converted to [`ErrorResponse`] and returned to the client.
 ///
 /// [`ErrorResponse`]: types::ErrorResponse