LibWeb/IDB: Implement IDBObjectStore::deleteIndex

Author: https://github.com/stelar7
Commit: 718c805e95
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4178
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/AtkinsSJ

Libraries/LibWeb/IndexedDB/IDBObjectStore.cpp

@@ -189,4 +189,37 @@ WebIDL::ExceptionOr<GC::Ref<IDBIndex>> IDBObjectStore::index(String const& name)
     return IDBIndex::create(realm(), *index, *this);
 }
 
+// https://w3c.github.io/IndexedDB/#dom-idbobjectstore-deleteindex
+WebIDL::ExceptionOr<void> IDBObjectStore::delete_index(String const& name)
+{
+    // 1. Let transaction be this’s transaction.
+    auto transaction = this->transaction();
+
+    // 2. Let store be this’s object store.
+    auto store = this->store();
+
+    // 3. If transaction is not an upgrade transaction, throw an "InvalidStateError" DOMException.
+    if (transaction->mode() != Bindings::IDBTransactionMode::Versionchange)
+        return WebIDL::InvalidStateError::create(realm(), "Transaction is not an upgrade transaction"_string);
+
+    // FIXME: 4. If store has been deleted, throw an "InvalidStateError" DOMException.
+
+    // 5. If transaction’s state is not active, then throw a "TransactionInactiveError" DOMException.
+    if (transaction->state() != IDBTransaction::TransactionState::Active)
+        return WebIDL::TransactionInactiveError::create(realm(), "Transaction is not active"_string);
+
+    // 6. Let index be the index named name in store if one exists, or throw a "NotFoundError" DOMException otherwise.
+    auto index = m_indexes.get(name);
+    if (!index.has_value())
+        return WebIDL::NotFoundError::create(realm(), "Index not found"_string);
+
+    // 7. Remove index from this’s index set.
+    m_indexes.remove(name);
+
+    // 8. Destroy index.
+    store->index_set().remove(name);
+
+    return {};
+}
+
 }