sqlite: check database state before calling SQLite

Check whether the database is open in enableLoadExtension() and
setAuthorizer() before passing the connection to SQLite. This prevents
calls after close() from terminating the process and makes them throw
ERR_INVALID_STATE instead.

Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: codex:gpt-5.6-sol

Author: trivikr

src/node_sqlite.cc

@@ -2396,7 +2396,10 @@ void DatabaseSync::EnableLoadExtension(
     const FunctionCallbackInfo<Value>& args) {
   DatabaseSync* db;
   ASSIGN_OR_RETURN_UNWRAP(&db, args.This());
-  auto isolate = args.GetIsolate();
+  Environment* env = Environment::GetCurrent(args);
+  THROW_AND_RETURN_ON_BAD_STATE(env, !db->IsOpen(), "database is not open");
+
+  Isolate* isolate = env->isolate();
   if (!args[0]->IsBoolean()) {
     THROW_ERR_INVALID_ARG_TYPE(isolate,
                                "The \"allow\" argument must be a boolean.");
@@ -2424,7 +2427,7 @@ void DatabaseSync::EnableDefensive(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
   THROW_AND_RETURN_ON_BAD_STATE(env, !db->IsOpen(), "database is not open");
 
-  auto isolate = args.GetIsolate();
+  Isolate* isolate = env->isolate();
   if (!args[0]->IsBoolean()) {
     THROW_ERR_INVALID_ARG_TYPE(isolate,
                                "The \"active\" argument must be a boolean.");
@@ -2475,6 +2478,8 @@ void DatabaseSync::SetAuthorizer(const FunctionCallbackInfo<Value>& args) {
   DatabaseSync* db;
   ASSIGN_OR_RETURN_UNWRAP(&db, args.This());
   Environment* env = Environment::GetCurrent(args);
+  THROW_AND_RETURN_ON_BAD_STATE(env, !db->IsOpen(), "database is not open");
+
   Isolate* isolate = env->isolate();
 
   if (args[0]->IsNull()) {

test/parallel/test-sqlite-authz.js

@@ -275,4 +275,16 @@ suite('DatabaseSync.prototype.setAuthorizer()', () => {
       message: /The "callback" argument must be a function/
     });
   });
+
+  it('throws if database is not open', () => {
+    const db = new DatabaseSync(':memory:');
+    db.close();
+
+    assert.throws(() => {
+      db.setAuthorizer(() => constants.SQLITE_OK);
+    }, {
+      code: 'ERR_INVALID_STATE',
+      message: 'database is not open',
+    });
+  });
 });

test/parallel/test-sqlite-config.js

@@ -61,3 +61,15 @@ test('throws if options.defensive is provided but is not a boolean', (t) => {
     message: 'The "options.defensive" argument must be a boolean.',
   });
 });
+
+test('enableLoadExtension() throws if database is not open', (t) => {
+  const db = new DatabaseSync(':memory:', { allowExtension: true });
+  db.close();
+
+  t.assert.throws(() => {
+    db.enableLoadExtension(false);
+  }, {
+    code: 'ERR_INVALID_STATE',
+    message: 'database is not open',
+  });
+});