@middy/s3-key-normalizer/index.js

S3 key normalizer middleware for the middy framework

"use strict";

const s3KeyNormalizerMiddleware = () => ({
  before: s3KeyNormalizerMiddlewareBefore
});

const s3KeyNormalizerMiddlewareBefore = async request => {
  parseEvent(request.event);
};

const parseEvent = event => {
  const records = event === null || event === void 0 ? void 0 : event.Records;
  if (!Array.isArray(records)) return;

  for (const record of records) {
    if (record.eventSource === 'aws:s3') {
      normalizeS3Key(record);
    } else if (record.EventSource === 'aws:sns') {
      parseEvent(record.Sns.Message);
    } else if (record.eventSource === 'aws:sqs') {
      parseEvent(record.body);
    }
  }
};

const normalizeS3KeyReplacePlus = /\+/g;

const normalizeS3Key = record => {
  var _record$s, _record$s$object;

  const eventVersion = Number.parseFloat(record.eventVersion);

  if (record !== null && record !== void 0 && (_record$s = record.s3) !== null && _record$s !== void 0 && (_record$s$object = _record$s.object) !== null && _record$s$object !== void 0 && _record$s$object.key && eventVersion >= 2 && eventVersion < 3) {
    record.s3.object.key = decodeURIComponent(record.s3.object.key.replace(normalizeS3KeyReplacePlus, ' '));
  }
};

module.exports = s3KeyNormalizerMiddleware;