feat: support isBinary for GCP (#353)

* feat: support isBinary for GCP

Fixes #352

Signed-off-by: Pete Muir <[email protected]>

* chore: jsdoc

Co-authored-by: Markus Maga <[email protected]>

Author: pmuir

lib/backends/gcp-secrets-manager-backend.js

@@ -17,14 +17,19 @@ class GCPSecretsManagerBackend extends KVBackend {
   /**
    * Get secret property value from GCP Secrets Manager.
    * @param {string} key - Key used to store secret property value in GCP Secrets Manager.
+   * @param {boolean} keyOptions.isBinary - Is the secret base64 encoded? Set to true to handle as binary.
    * @returns {Promise} Promise object representing secret property value.
    */
-  async _get ({ key }) {
+  async _get ({ key, keyOptions }) {
     this._logger.info(`fetching secret ${key} from GCP Secret Manager`)
     const version = await this._client.accessSecretVersion({
       name: key
     })
     const secret = { value: version[0].payload.data.toString('utf8') }
+    // Handle binary files - this is useful when you've stored a base64 encoded string
+    if (keyOptions && keyOptions.isBinary) {
+      return Buffer.from(secret.value, 'base64')
+    }
     return JSON.stringify(secret)
   }
 }