Structural changes, move auth to separate module .

src/auth/apikey.rs

@@ -0,0 +1,16 @@
+use crate::auth::types::AuthValidator;
+use pingora_proxy::Session;
+use subtle::ConstantTimeEq;
+
+pub struct ApiKeyAuth<'a>(pub(crate) &'a str);
+#[async_trait::async_trait]
+impl AuthValidator for ApiKeyAuth<'_> {
+    async fn validate(&self, session: &mut Session) -> bool {
+        if let Some(header) = session.get_header("x-api-key") {
+            if let Ok(h) = header.to_str() {
+                return h.as_bytes().ct_eq(self.0.as_bytes()).into();
+            }
+        }
+        false
+    }
+}