/*
* Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.aws.impl;
import com.hazelcast.aws.security.EC2RequestSigner;
import com.hazelcast.aws.utility.CloudyUtility;
import com.hazelcast.config.AwsConfig;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.TimeZone;
import static com.hazelcast.aws.impl.Constants.DOC_VERSION;
import static com.hazelcast.aws.impl.Constants.GET;
import static com.hazelcast.aws.impl.Constants.SIGNATURE_METHOD;
import static com.hazelcast.aws.impl.Constants.SIGNATURE_VERSION;
public class DescribeInstances {
private final EC2RequestSigner rs;
private final AwsConfig awsConfig;
private Map<String, String> attributes = new HashMap<String, String>();
public DescribeInstances(AwsConfig awsConfig) {
if (awsConfig == null) {
throw new IllegalArgumentException("AwsConfig is required!");
}
if (awsConfig.getAccessKey() == null) {
throw new IllegalArgumentException("AWS access key is required!");
}
rs = new EC2RequestSigner(awsConfig.getSecretKey());
attributes.put("Action", this.getClass().getSimpleName());
attributes.put("Version", DOC_VERSION);
attributes.put("SignatureVersion", SIGNATURE_VERSION);
attributes.put("SignatureMethod", SIGNATURE_METHOD);
attributes.put("AWSAccessKeyId", awsConfig.getAccessKey());
attributes.put("Timestamp", getFormattedTimestamp());
this.awsConfig = awsConfig;
}
/**
* Formats date as ISO 8601 timestamp
*/
private String getFormattedTimestamp() {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
df.setTimeZone(TimeZone.getTimeZone("UTC"));
return df.format(new Date());
}
public String getQueryString() {
return CloudyUtility.getQueryString(attributes);
}
public Map<String, String> getAttributes() {
return attributes;
}
public void putSignature(String value) {
attributes.put("Signature", value);
}
public Map<String, String> execute(String endpoint) throws Exception {
rs.sign(this, endpoint);
InputStream stream = callService(endpoint);
return CloudyUtility.unmarshalTheResponse(stream, awsConfig);
}
private InputStream callService(String endpoint) throws Exception {
String query = getQueryString();
URL url = new URL("https", endpoint, -1, "/" + query);
HttpURLConnection httpConnection = (HttpURLConnection) (url.openConnection());
httpConnection.setRequestMethod(GET);
httpConnection.setDoOutput(true);
httpConnection.connect();
return httpConnection.getInputStream();
}
}