Remove magic strings

Author: Ndpnt

src/collection-api/routes/metadata.js

@@ -6,6 +6,9 @@ import yaml from 'js-yaml';
 
 import Service from '../../archivist/services/service.js';
 
+const METADATA_FILENAME = 'metadata.yml';
+const PACKAGE_JSON_PATH = '../../../package.json';
+
 /**
  * @swagger
  * tags:
@@ -130,8 +133,8 @@ import Service from '../../archivist/services/service.js';
 export default async function metadataRouter(collectionPath, services) {
   const router = express.Router();
 
-  const STATIC_METADATA = yaml.load(await fs.readFile(path.join(collectionPath, '/metadata.yml'), 'utf8'));
-  const { version: engineVersion } = JSON.parse(await fs.readFile(new URL('../../../package.json', import.meta.url)));
+  const STATIC_METADATA = yaml.load(await fs.readFile(path.join(collectionPath, METADATA_FILENAME), 'utf8'));
+  const { version: engineVersion } = JSON.parse(await fs.readFile(new URL(PACKAGE_JSON_PATH, import.meta.url)));
 
   /**
    * @swagger