private async init()

in src/backend/deny-list/client.lambda-shared.ts [37:76]

31 lines of code
8 McCabe index (conditional complexity)


  private async init() {
    if (this._map) {
      throw new Error('init() cannot be called twice');
    }

    this._map = {};

    try {
      const params = {
        Bucket: this.bucketName,
        Key: this.objectKey,
      };

      const { Body: body } = await this.s3.getObject(params).promise();
      if (!body) {
        console.log(`WARNING: deny list body is empty at ${this.bucketName}/${this.objectKey}`);
        return;
      }

      const contents = body.toString('utf-8');

      // an empty string is a valid (empty) deny list
      if (contents.length === 0) {
        return;
      }

      const data = JSON.parse(contents) as DenyListMap;
      if (typeof(data) != 'object') {
        throw new Error(`Invalid format in deny list file at ${this.bucketName}/${this.objectKey}. Expecting a map`);
      }

      this._map = data;
    } catch (e) {
      if (e.code === 'NoSuchKey' || e.code === 'NoSuchBucket') {
        return;
      }

      throw new Error(`Unable to parse deny list file ${this.bucketName}/${this.objectKey}: ${e}`);
    }
  }