Introduce BackendHandler trait and impl

src/domain/handler.rs

@@ -0,0 +1,49 @@
+use crate::infra::configuration::Configuration;
+use anyhow::{bail, Result};
+use sqlx::any::AnyPool;
+
+pub struct BindRequest {
+    pub name: String,
+    pub password: String,
+}
+
+pub struct SearchRequest {}
+
+pub struct SearchResponse {}
+
+pub trait BackendHandler: Clone + Send {
+    fn bind(&mut self, request: BindRequest) -> Result<()>;
+    fn search(&mut self, request: SearchRequest) -> Result<SearchResponse>;
+}
+
+#[derive(Debug, Clone)]
+pub struct SqlBackendHandler {
+    config: Configuration,
+    sql_pool: AnyPool,
+    authenticated: bool,
+}
+
+impl SqlBackendHandler {
+    pub fn new(config: Configuration, sql_pool: AnyPool) -> Self {
+        SqlBackendHandler {
+            config,
+            sql_pool,
+            authenticated: false,
+        }
+    }
+}
+
+impl BackendHandler for SqlBackendHandler {
+    fn bind(&mut self, request: BindRequest) -> Result<()> {
+        if request.name == self.config.admin_dn && request.password == self.config.admin_password {
+            self.authenticated = true;
+            Ok(())
+        } else {
+            bail!(r#"Authentication error for "{}""#, request.name)
+        }
+    }
+
+    fn search(&mut self, request: SearchRequest) -> Result<SearchResponse> {
+        Ok(SearchResponse {})
+    }
+}