refactor-config: Implements builder pattern for AuthConfig struct

Signed-off-by: Harsh1s <thisishraj@gmail.com>

crates/utils/src/config/auth.rs

@@ -17,13 +17,42 @@ pub struct AuthConfig {
 }
 
 impl AuthConfig {
-    /// Generate a new `AuthConfig` object
-    #[must_use]
-    #[inline]
-    pub fn new(auth_public_key: Option<PathBuf>, auth_private_key: Option<PathBuf>) -> Self {
-        Self {
-            auth_public_key,
-            auth_private_key,
+    /// Creates a new `AuthConfigBuilder` for building `AuthConfig` objects.
+    pub fn new() -> AuthConfigBuilder {
+        AuthConfigBuilder {
+            auth_public_key: None,
+            auth_private_key: None,
+        }
+    }
+}
+
+/// `AuthConfigBuilder` is a builder for `AuthConfig` objects.
+#[derive(Debug)]
+pub struct AuthConfigBuilder {
+    /// The public key file
+    auth_public_key: Option<PathBuf>,
+    /// The private key file
+    auth_private_key: Option<PathBuf>,
+}
+
+impl AuthConfigBuilder {
+    /// Sets the public key file path for the `AuthConfig`.
+    pub fn auth_public_key(&mut self, path: PathBuf) -> &mut Self {
+        self.auth_public_key = Some(path);
+        self
+    }
+
+    /// Sets the private key file path for the `AuthConfig`.
+    pub fn auth_private_key(&mut self, path: PathBuf) -> &mut Self {
+        self.auth_private_key = Some(path);
+        self
+    }
+
+    /// Builds the `AuthConfig` object with the provided configurations.
+    pub fn build(&mut self) -> AuthConfig {
+        AuthConfig {
+            auth_public_key: self.auth_public_key.take(),
+            auth_private_key: self.auth_private_key.take(),
         }
     }
 }

crates/xline/src/utils/args.rs

@@ -317,7 +317,10 @@ impl From<ServerArgs> for XlineServerConfig {
             args.jaeger_output_dir,
             args.jaeger_level,
         );
-        let auth = AuthConfig::new(args.auth_public_key, args.auth_private_key);
+        let auth = AuthConfig::new()
+            .auth_public_key(args.auth_public_key.unwrap())
+            .auth_private_key(args.auth_private_key.unwrap())
+            .build();
         let auto_compactor_cfg = if let Some(mode) = args.auto_compact_mode {
             match mode.as_str() {
                 "periodic" => {