React Native

S3 Upload String using AWS Signature Version 2

See more Amazon S3 (new) Examples

Example to upload the contents of a string to the Amazon S3 service, using the older AWS Signature Version 2. React Native

import { AuthAws, FileAccess, Rest } from '@chilkat/react-native'

async function chilkatExample() {
  // Demonstrates how to use older AWS S3 Signature Version 2 for uploading the contents
  // of a string variable to an object in a bucket.

  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  const rest = new Rest();

  // Connect to the Amazon AWS REST server.
  const bTls = true;
  const port = 443;
  const bAutoReconnect = true;
  // The file is uploaded to the bucket named "chilkat100", which becomes part of the domain:
  await rest.connectAsync('chilkat100.s3.amazonaws.com', port, bTls, bAutoReconnect);

  // ----------------------------------------------------------------------------
  // Important: For buckets created in regions outside us-east-1,
  // there are three important changes that need to be made.
  // See Working with S3 Buckets in Non-us-east-1 Regions for the details.
  // ----------------------------------------------------------------------------

  // Provide AWS credentials for the REST call.
  const authAws = new AuthAws();
  authAws.accessKey = 'AWS_ACCESS_KEY';
  authAws.secretKey = 'AWS_SECRET_KEY';
  authAws.serviceName = 's3';

  // For AWS Signature Version 2, the following two properties need to be set:
  authAws.signatureVersion = 2;
  // See http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#ConstructingTheCanonicalizedResourceElement
  // The bucket is "chilkat100", and the uriPath is "/hamlet_play.xml", which must match
  // the URI path passed to the FullRequestString method below.
  authAws.canonicalizedResourceV2 = '/chilkat100/hamlet_play.xml';

  rest.setAuthAws(authAws);

  // Load a text file into memory.
  const fac = new FileAccess();
  let fileContents: string;
  try {
    fileContents = fac.readEntireTextFile('qa_data/xml/hamlet.xml', 'utf-8');
  } catch {
    console.log(fac.lastErrorText);
    return;
  }

  // To send the file in gzip or deflate compressed format, set the Content-Encoding request
  // header to "gzip" or "deflate".  (this is optional)
  rest.addHeader('Content-Encoding', 'gzip');

  // Indicate the Content-Type of our upload.  (This is optional)
  rest.addHeader('Content-Type', 'text/xml');

  // We can add an "Expect: 100-continue" header so that if the request is rejected
  // by the server immediately after receiving the request header, it can respond
  // and the client (Chilkat) can avoid sending the file data.
  // (this is optional)
  rest.addHeader('Expect', '100-continue');

  // Upload the file to Amazon S3.
  let responseBodyStr: string;
  try {
    responseBodyStr = await rest.fullRequestStringAsync('PUT', '/hamlet_play.xml', fileContents);
  } catch {
    console.log(rest.lastErrorText);
    return;
  }

  // Did we get a 200 response indicating success?
  const statusCode = rest.responseStatusCode;
  if (statusCode !== 200) {
    console.log(`Error response: ${responseBodyStr}`);
    console.log(`Status code: ${statusCode}, Status text: ${rest.responseStatusText}`);
    return;
  }

  console.log('File successfully uploaded.');
}