refactor: extract isDatabaseConflictError to plugin api

Signed-off-by: Camila Belo <camilaibs@gmail.com>

packages/backend-plugin-api/src/services/index.ts

@@ -16,3 +16,4 @@
 
 export * from './definitions';
 export * from './system';
+export * from './utilities';

packages/backend-plugin-api/src/services/utilities/database.ts

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2021 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Tries to deduce whether a thrown error is a database conflict.
+ *
+ * @public
+ * @param e - A thrown error
+ * @returns True if the error looks like it was a conflict error thrown by a
+ *          known database engine
+ */
+export function isDatabaseConflictError(e: unknown) {
+  const message = (e as any)?.message;
+
+  return (
+    typeof message === 'string' &&
+    (/SQLITE_CONSTRAINT(?:_UNIQUE)?: UNIQUE/.test(message) ||
+      /UNIQUE constraint failed:/.test(message) ||
+      /unique constraint/.test(message) ||
+      /Duplicate entry/.test(message)) // MySQL uniqueness error msg
+  );
+}

packages/backend-plugin-api/src/services/utilities/index.ts

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2024 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export { isDatabaseConflictError } from './database';