refactor: Reuse typed LDAP attributes in search results

src/ldap/op/search.rs

@@ -148,30 +148,42 @@ pub async fn search_success(
 
 fn search_entry_from_user(user: &User, req_attrs: &[String]) -> LdapSearchResultEntry {
     let mut res: Vec<LdapPartialAttribute> = vec![];
-    for attr in req_attrs {
-        if let Some(attr_values) = match attr.as_str() {
-            "uid" => Some(vec![user.username.clone()]),
-            "cn" | "mail" => Some(vec![user.mail.clone()]),
-            // TODO: group membership
-            "memberof" => Some(vec![]),
-            // Copied from lldap output, not sure if we want to add/remove some classes depending on context
-            "objectclass" => Some(
-                vec!["inetOrgPerson", "posixAccount", "mailAccount", "person"]
-                    .into_iter()
-                    .map(String::from)
-                    .collect(),
-            ),
-            _ => {
-                tracing::warn!("Ignoring unknown attr in search query: {attr}");
-                None
+    for attr_str in req_attrs {
+        // We keep a copy of the requested attribute so that we can answer as it was requested,
+        // eg. `CN` => `CN` (instead of normalizing to `cn`).
+        let Some(attr) = LdapAttribute::from_str(attr_str)
+            .inspect_err(|e| tracing::debug!("Unknown attribute in request: {e}"))
+            .ok()
+        else {
+            continue;
+        };
+
+        let str_values = match attr {
+            // TODO: should we normalize the value some more here?
+            LdapAttribute::Uid => vec![user.username.clone()],
+            // TODO: should CN be different than the mail?
+            // TODO: should we normalize values some more here?
+            LdapAttribute::CommonName | LdapAttribute::Mail | LdapAttribute::MailAlias => {
+                vec![user.mail.clone()]
             }
-        } {
-            res.push(LdapPartialAttribute {
-                atype: attr.clone(),
-                // LDAP response expects raw byte vec for each value
-                vals: attr_values.into_iter().map(Vec::from).collect(),
-            });
-        }
+            // TODO: group membership
+            LdapAttribute::MemberOf => vec![],
+            // TODO: if we introduce mail permission, we need to remove mailaccount from here
+            LdapAttribute::ObjectClass => vec![
+                "inetOrgPerson".to_string(),
+                "posixAccount".to_string(),
+                "mailAccount".to_string(),
+                "person".to_string(),
+            ],
+        };
+
+        res.push(LdapPartialAttribute {
+            // Reuse the requested attribute name, not the normalized form
+            // we would otherwise produce.
+            atype: attr_str.clone(),
+            // LDAP response expects raw byte vec for each value
+            vals: str_values.into_iter().map(Vec::from).collect(),
+        });
     }
 
     LdapSearchResultEntry {