Creating a Bucket

Scenarios

A bucket is a container that stores objects in OBS. You need to create a bucket before storing data in OBS.

The following describes how to call the API for creating a bucket in a specified region. For details about how to call an API, see Calling APIs.

Prerequisites

  • You have obtained the AK and SK. For details about how to obtain the AK and SK, see Obtaining Access Keys (AK/SK).

  • You have planned the region where you want to create a bucket and obtained the endpoint required for API calls. For details, see Regions and Endpoints.

Once a region is determined, it cannot be modified after the bucket is created.

Creating a Bucket Named bucket001 in the a1 Region

In this example, an Apache HttpClient is used.

package com.obsclient;

import java.io.*;

import org.apache.http.Header;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

public class TestMain {

    public static String accessKey = "UDSIAMSTUBTEST000012"; //The value of this parameter is the AK obtained.
     public static String securityKey = "Udsiamstubtest000000UDSIAMSTUBTEST000012";  //The value of this parameter is the SK obtained.
    public static String region = "a1"; // The value is the region where the planned bucket resides.
    public static String createBucketTemplate =
            "<CreateBucketConfiguration " +
            "xmlns=\"http://obs.a1.example.com/doc/2015-06-30/\">\n" +
            "<Location>" + region + "</Location>\n" +
            "</CreateBucketConfiguration>";

    public static void main(String[] str) {

         createBucket();

    }

    private static void createBucket() {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        String requesttime = DateUtils.formatDate(System.currentTimeMillis());
        String contentType = "application/xml";
        HttpPut httpPut = new HttpPut("http://bucket001.obs.a1.example.com");
        httpPut.addHeader("Date", requesttime);
        httpPut.addHeader("Content-Type", contentType);

        /**Calculate the signature based on the request.**/
        String contentMD5 = "";
        String canonicalizedHeaders = "";
        String canonicalizedResource = "/bucket001/";
        // Content-MD5 and Content-Type fields do not contain line breaks. The data format is RFC 1123, which is the same as the time in the request.
        String canonicalString = "PUT" + "\n" + contentMD5 + "\n" + contentType + "\n" + requesttime + "\n" + canonicalizedHeaders + canonicalizedResource;
        System.out.println("StringToSign:[" + canonicalString + "]");
        String signature = null;
        CloseableHttpResponse httpResponse = null;
        try {
            signature = Signature.signWithHmacSha1(securityKey, canonicalString);

             // Added the Authorization: OBS AccessKeyID:signature field to the header.
            httpPut.addHeader("Authorization", "OBS " + accessKey + ":" + signature);

            // Add a body.
            httpPut.setEntity(new StringEntity(createBucketTemplate));

            httpResponse = httpClient.execute(httpPut);

            // Prints the sending request information and the received response message.
            System.out.println("Request Message:");
            System.out.println(httpPut.getRequestLine());
            for (Header header : httpPut.getAllHeaders()) {
                System.out.println(header.getName() + ":" + header.getValue());
            }

            System.out.println("Response Message:");
            System.out.println(httpResponse.getStatusLine());
            for (Header header : httpResponse.getAllHeaders()) {
                System.out.println(header.getName() + ":" + header.getValue());
            }
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    httpResponse.getEntity().getContent()));

            String inputLine;
            StringBuffer response = new StringBuffer();

            while ((inputLine = reader.readLine()) != null) {
                response.append(inputLine);
            }
            reader.close();

            // print result
            System.out.println(response.toString());
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

}

The format of the Date header field DateUtils is as follows:

package com.obsclient;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Locale;
import java.util.TimeZone;

public class DateUtils {

    public static String formatDate(long time)
    {
        DateFormat serverDateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.ENGLISH);
        serverDateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
        return serverDateFormat.format(time);
    }
}

The method of calculating the signature character string is as follows:

package com.obsclient;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.NoSuchAlgorithmException;
import java.security.InvalidKeyException;
import java.util.Base64;

public class Signature {
    public static String signWithHmacSha1(String sk, String canonicalString) throws UnsupportedEncodingException {

        try {
            SecretKeySpec signingKey = new SecretKeySpec(sk.getBytes("UTF-8"), "HmacSHA1");
            Mac mac = Mac.getInstance("HmacSHA1");
            mac.init(signingKey);
            return Base64.getEncoder().encodeToString(mac.doFinal(canonicalString.getBytes("UTF-8")));
        } catch (NoSuchAlgorithmException | InvalidKeyException | UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }
}