Dart Requires Chilkat v11.0.0+

Walmart Partner API Authentication (Generate a Signature for a Request)

See more RSA Examples

Demonstrates how to generate a signature for a Walmart Partner REST API call. Dart

import 'package:chilkat/chilkat.dart';

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

  final consumerId = 'b68d2a72....';
  final baseUrl = 'https://marketplace.walmartapis.com/v2/feeds';
  // This is your Base64 encoded private key
  final privateEncodedStr = 'MIICeAIBADANBgkqhkiG9w0BAQEFAA......';
  final httpMethod = 'GET';

  // We need a timestamp in decimal string form representing the number of milliseconds since Jan 01 1970 UTC.
  final dt = CkDateTime();
  // Set bLocal = true for a timestamp in the local timezone.  Set bLocal = false for a UTC timestamp.
  final bLocal = false;
  // This gets the timestamp in seconds, not milliseconds.
  final timeStampVal = dt.getAsUnixTime(bLocal);

  // Build the string to sign.
  final sbStringToSign = CkStringBuilder();
  sbStringToSign.append(consumerId);
  sbStringToSign.append('\n');
  sbStringToSign.append(baseUrl);
  sbStringToSign.append('\n');
  sbStringToSign.append(httpMethod);
  sbStringToSign.append('\n');
  sbStringToSign.appendInt(timeStampVal);
  // We add three zero's so that the timestamp value is in milliseconds.
  // We don't care about accuracy down to less than a second.
  // All the server cares about is that the request was signed at the current date/time
  // within some reasonable margin of error (to account for systems having clocks
  // that may be slightly different).
  sbStringToSign.append('000\n');

  final privKey = CkPrivateKey();
  // Load the private key into a private key object.
  // Note: Technically the private key is not PEM because it lacks the header/footer strings
  // used for PEM.  However, the LoadPem method will still accept it and load it correctly.
  try {
    privKey.loadPem(privateEncodedStr);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final rsa = CkRsa();
  try {
    rsa.usePrivateKey(privKey);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // We want a base64 signature string.
  rsa.encodingMode = 'base64';

  final String signatureString;
  try {
    signatureString = rsa.signStringENC(sbStringToSign.getAsString(), 'SHA256');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Signature String: $signatureString');
}