How to post a request to Amazon MWS / GetMatchingProductForId

Question

I want to get the details (Price, sorting ...) of the products that I have been querying for a long time from amazon. But I was only able to generate the following answer with the following koc. The problems I encountered are as follows;

1- I am getting timestamp error.

2- I was unable to POST the message below.

Can you help me with these two issues?

Note: I am using Anypoint Studio 7.11.1. I can post the answer in java with https reqeuest connector.

Java Code:

package com.amazonservices.mws.products;

import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLEncoder;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SignatureException;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
import java.util.TimeZone;
import java.util.Date;

public class signature {
    private static final String CHARACTER_ENCODING = "UTF-8";
    final static String ALGORITHM = "HmacSHA256";
  
    
    public static void main() throws Exception {
        String secretKey = "***";
        String serviceUrl = "https://mws.amazonservices.com/";

        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
        df.setTimeZone(TimeZone.getTimeZone("UTC"));
        Date date = new Date();  
        String timestamp = df.format(date); 
        
        HashMap parameters = new HashMap();

        parameters.put("AWSAccessKeyId", urlEncode("***"));
        parameters.put("Action", urlEncode("GetMatchingProductForId"));
        parameters.put("IdList.Id.1", urlEncode("9781933988665"));
        parameters.put("IdType", urlEncode("EAN"));
        parameters.put("SellerId", urlEncode("***"));
        parameters.put("SignatureMethod", urlEncode(ALGORITHM));
        parameters.put("SignatureVersion", urlEncode("2"));
        parameters.put("Timestamp", urlEncode(timestamp));
        parameters.put("Version", urlEncode("2011-10-01"));


        String formattedParameters = calculateStringToSignV2(parameters,
            serviceUrl);

        String signature = sign(formattedParameters, secretKey);

        // Add signature to the parameters and display final results
        parameters.put("Signature", urlEncode(signature));      
        
        System.out.println(calculateStringToSignV2(parameters,
            serviceUrl));
    }


    private static String calculateStringToSignV2(
        Map parameters, String serviceUrl)
            throws SignatureException, URISyntaxException {
        // Sort the parameters alphabetically by storing
        // in TreeMap structure
        Map sorted = new TreeMap();
        sorted.putAll(parameters);

        // Set endpoint value
        URI endpoint = new URI(serviceUrl.toLowerCase());

        // Create flattened (String) representation
        StringBuilder data = new StringBuilder();
        //data.append("POST
");
        data.append(endpoint.getHost());
        data.append("
/Products/2011-10-01");
        data.append("
");

        Iterator> pairs =
          sorted.entrySet().iterator();
        while (pairs.hasNext()) {
            Map.Entry pair = pairs.next();
            if (pair.getValue() != null) {
                data.append( pair.getKey() + "=" + pair.getValue());
            }
            else {
                data.append( pair.getKey() + "=");
            }

            // Delimit parameters with ampersand (&)
            if (pairs.hasNext()) {
                data.append( "&");
            }
        }

        return data.toString();
    }

    /*
     * Sign the text with the given secret key and convert to base64
     */
    private static String sign(String data, String secretKey)
            throws NoSuchAlgorithmException, InvalidKeyException,
                   IllegalStateException, UnsupportedEncodingException {
        Mac mac = Mac.getInstance(ALGORITHM);
        mac.init(new SecretKeySpec(secretKey.getBytes(CHARACTER_ENCODING),
            ALGORITHM));
        byte[] signature = mac.doFinal(data.getBytes(CHARACTER_ENCODING));
        String signatureBase64 = new String(Base64.encodeBase64(signature),
            CHARACTER_ENCODING);
        return new String(signatureBase64);
    }

    private static String urlEncode(String rawValue) {
        String value = (rawValue == null) ? "" : rawValue;
        String encoded = null;

        try {
            encoded = URLEncoder.encode(value, CHARACTER_ENCODING)
                .replace("+", "%20")
                .replace("*", "%2A")
                .replace("%7E","~");                ;
        } catch (UnsupportedEncodingException e) {
            System.err.println("Unknown encoding: " + CHARACTER_ENCODING);
            e.printStackTrace();
        }

        return encoded;
    }
  }

Code Output:

AWSAccessKeyId=&Action=GetMatchingProductForId&SellerId=&Signature=ehjKNnTB5vhrOW3J1yWSz2T7c%3D&SignatureMethod=HmacSHA256&SignatureVersion=2&SubmittedFromDate=2013-05-01T12%3A00%3A00Z&Timestamp=2013-05-02T16%3A00%3A00Z&Version=2011-10-01

Mulesoft Version: 7.11.1

Application XML Detail:




    
        
            
                
            
        
        
            
            
            
                > "UTC") as String {format: "YYYY-MM-dd"} ++ "T" ++ (now() >> "UTC") as String {format: "HH:mm:ss"} ++ "Z"
---
{
    myDate:"mws.amazonservices.com/Products/2011-10-01?AWSAccessKeyId=AKIAI56GX43PIHX4C7XA&Action=GetMatchingProductForId&IdList.Id.1=9781933988665&IdType=EAN&MarketplaceId=ATVPDKIKX0DER&SellerId=A28MSXET37R4N7&SignatureMethod=HmacSHA256&SignatureVersion=2&Version=2011-10-01&Timestamp=" ++ getFormattedDate() replace (':') with ('%3A')
}]]>

Thanks.

How to post a request to Amazon MWS / GetMatchingProductForId

Answers (1)

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