import * as Evaporate from 'evaporate';
import * as crypto from "crypto-js";

Evaporate.create({
  aws_key: <ACCESS_KEY>,
  bucket: 'my-bucket',
  awsRegion: 'eu-west',
  computeContentMd5: true,
  cryptoMd5Method: data => crypto.algo.MD5.create().update(String.fromCharCode.apply(null, new Uint32Array(data))).finalize().toString(crypto.enc.Base64),
  cryptoHexEncodedHash256: (data) => crypto.algo.SHA256.create().update(data as string).finalize().toString(crypto.enc.Hex),
  logging: true,
  maxConcurrentParts: 5,  
  customAuthMethod: (signParams: object, signHeaders: object, stringToSign: string, signatureDateTime: string, canonicalRequest: string): Promise<string> => {
      const stringToSignDecoded = decodeURIComponent(stringToSign)
      const requestScope = stringToSignDecoded.split("\n")[2];
      const [date, region, service, signatureType] = requestScope.split("/");
      const round1 = crypto.HmacSHA256(`AWS4${signParams['secret_key']}`, date);
      const round2 = crypto.HmacSHA256(round1, region);
      const round3 = crypto.HmacSHA256(round2, service);
      const round4 = crypto.HmacSHA256(round3, signatureType);
      const final = crypto.HmacSHA256(round4, stringToSignDecoded);
      return Promise.resolve(final.toString(crypto.enc.Hex));
  },
  signParams: { secretKey: <SECRET_KEY> },
  partSize: 1024 * 1024 * 6
}).then((evaporate) => {
      evaporate.add({
          name: 'my-key',
          file: file, // file from <input type="file" />
          xAmzHeadersCommon: { 'x-amz-security-token': <SECURITY_TOKEN> },
          xAmzHeadersAtInitiate: { 'x-amz-security-token': <SECURITY_TOKEN> },
       }).then(() => console.log('complete'));
  },
     (error) => console.error(error)
);