Add command check-auth

src/server/authorization.rs

@@ -0,0 +1,33 @@
+use crate::{
+    core::{common::UnixUser, protocol::CheckAuthorizationError, types::DbOrUser},
+    server::input_sanitization::{validate_name, validate_ownership_by_unix_user},
+};
+
+pub async fn check_authorization(
+    dbs_or_users: Vec<DbOrUser>,
+    unix_user: &UnixUser,
+) -> std::collections::BTreeMap<DbOrUser, Result<(), CheckAuthorizationError>> {
+    let mut results = std::collections::BTreeMap::new();
+
+    for db_or_user in dbs_or_users {
+        if let Err(err) = validate_name(db_or_user.name()) {
+            results.insert(
+                db_or_user.clone(),
+                Err(CheckAuthorizationError::SanitizationError(err)),
+            );
+            continue;
+        }
+
+        if let Err(err) = validate_ownership_by_unix_user(db_or_user.name(), unix_user) {
+            results.insert(
+                db_or_user.clone(),
+                Err(CheckAuthorizationError::OwnershipError(err)),
+            );
+            continue;
+        }
+
+        results.insert(db_or_user.clone(), Ok(()));
+    }
+
+    results
+}