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| 1 | +/* |
| 2 | + * Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"). |
| 5 | + * You may not use this file except in compliance with the License. |
| 6 | + * A copy of the License is located at |
| 7 | + * |
| 8 | + * http://aws.amazon.com/apache2.0 |
| 9 | + * |
| 10 | + * or in the "license" file accompanying this file. This file is distributed |
| 11 | + * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either |
| 12 | + * express or implied. See the License for the specific language governing |
| 13 | + * permissions and limitations under the License. |
| 14 | + */ |
| 15 | +package com.amazonaws.eclipse.core; |
| 16 | + |
| 17 | +import java.io.IOException; |
| 18 | +import java.io.InputStream; |
| 19 | +import java.io.OutputStream; |
| 20 | +import java.text.ParseException; |
| 21 | +import java.text.SimpleDateFormat; |
| 22 | +import java.util.Date; |
| 23 | + |
| 24 | +import org.apache.http.Header; |
| 25 | +import org.apache.http.HttpEntity; |
| 26 | +import org.apache.http.HttpHost; |
| 27 | +import org.apache.http.HttpResponse; |
| 28 | +import org.apache.http.client.ClientProtocolException; |
| 29 | +import org.apache.http.client.CredentialsProvider; |
| 30 | +import org.apache.http.client.HttpClient; |
| 31 | +import org.apache.http.client.config.RequestConfig; |
| 32 | +import org.apache.http.client.config.RequestConfig.Builder; |
| 33 | +import org.apache.http.client.methods.HttpGet; |
| 34 | +import org.apache.http.client.methods.HttpHead; |
| 35 | +import org.apache.http.impl.client.DefaultHttpRequestRetryHandler; |
| 36 | +import org.apache.http.impl.client.HttpClientBuilder; |
| 37 | + |
| 38 | +public class AwsToolkitHttpClient { |
| 39 | + private final HttpClient httpClient; |
| 40 | + |
| 41 | + private AwsToolkitHttpClient( |
| 42 | + Integer connectionTimeout, |
| 43 | + Integer socketTimeout, |
| 44 | + String userAgent, |
| 45 | + HttpHost proxy, |
| 46 | + CredentialsProvider credentialsProvider) { |
| 47 | + |
| 48 | + Builder requestConfigBuilder = RequestConfig.custom(); |
| 49 | + if (connectionTimeout != null) { |
| 50 | + requestConfigBuilder.setConnectionRequestTimeout(connectionTimeout); |
| 51 | + } |
| 52 | + if (socketTimeout != null) { |
| 53 | + requestConfigBuilder.setSocketTimeout(socketTimeout); |
| 54 | + } |
| 55 | + |
| 56 | + HttpClientBuilder builder = HttpClientBuilder.create() |
| 57 | + .setDefaultRequestConfig(requestConfigBuilder.build()) |
| 58 | + .setUserAgent(userAgent); |
| 59 | + if (proxy != null) { |
| 60 | + builder.setProxy(proxy); |
| 61 | + if (credentialsProvider != null) { |
| 62 | + builder.setDefaultCredentialsProvider(credentialsProvider); |
| 63 | + } |
| 64 | + } |
| 65 | + httpClient = builder |
| 66 | + .setRetryHandler(new DefaultHttpRequestRetryHandler(3, true)) |
| 67 | + .build(); |
| 68 | + } |
| 69 | + |
| 70 | + /** |
| 71 | + * Head the given URL for the last modified date. |
| 72 | + * |
| 73 | + * @param url The target URL resource. |
| 74 | + * @return The last modified date give the URL, or null if the date cannot be retrieved |
| 75 | + * @throws ClientProtocolException |
| 76 | + * @throws IOException |
| 77 | + */ |
| 78 | + public Date getLastModifiedDate(String url) throws ClientProtocolException, IOException { |
| 79 | + HttpHead headMethod = new HttpHead(url); |
| 80 | + HttpResponse response = httpClient.execute(headMethod); |
| 81 | + Header header = response.getFirstHeader("Last-Modified"); |
| 82 | + if (header != null) { |
| 83 | + String lastModifiedDateString = header.getValue(); |
| 84 | + SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz"); |
| 85 | + try { |
| 86 | + return dateFormat.parse(lastModifiedDateString); |
| 87 | + } catch (ParseException e) { |
| 88 | + return null; |
| 89 | + } |
| 90 | + } |
| 91 | + return null; |
| 92 | + } |
| 93 | + |
| 94 | + /** |
| 95 | + * Fetch the content of the target URL and redirect to the output stream. |
| 96 | + * If no content is fetched, do nothing. |
| 97 | + * |
| 98 | + * @param url The target URL |
| 99 | + * @param output The OutputStream |
| 100 | + * @throws ClientProtocolException |
| 101 | + * @throws IOException |
| 102 | + */ |
| 103 | + public void outputEntityContent(String url, OutputStream output) throws ClientProtocolException, IOException { |
| 104 | + try (InputStream inputStream = getEntityContent(url)) { |
| 105 | + if (inputStream == null) { |
| 106 | + return; |
| 107 | + } |
| 108 | + int length; |
| 109 | + byte[] buffer = new byte[2048]; |
| 110 | + while ((length = inputStream.read(buffer)) != -1) { |
| 111 | + output.write(buffer, 0, length); |
| 112 | + } |
| 113 | + } |
| 114 | + } |
| 115 | + |
| 116 | + /** |
| 117 | + * Return the input stream of the underlying resource in the target URL. |
| 118 | + * @param url The target URL |
| 119 | + * @return The underlying input stream, or null if it doesn't have entity |
| 120 | + * @throws ClientProtocolException |
| 121 | + * @throws IOException |
| 122 | + */ |
| 123 | + public InputStream getEntityContent(String url) throws ClientProtocolException, IOException { |
| 124 | + HttpGet getMethod = new HttpGet(url); |
| 125 | + HttpResponse response = httpClient.execute(getMethod); |
| 126 | + HttpEntity entity = response.getEntity(); |
| 127 | + return entity == null ? null : entity.getContent(); |
| 128 | + } |
| 129 | + |
| 130 | + static AwsToolkitHttpClientBuilder builder() { |
| 131 | + return new AwsToolkitHttpClientBuilder(); |
| 132 | + } |
| 133 | + |
| 134 | + static final class AwsToolkitHttpClientBuilder { |
| 135 | + private Integer connectionTimeout; |
| 136 | + private Integer socketTimeout; |
| 137 | + private String userAgent; |
| 138 | + private HttpHost proxy; |
| 139 | + private CredentialsProvider credentialsProvider; |
| 140 | + |
| 141 | + private AwsToolkitHttpClientBuilder() {} |
| 142 | + |
| 143 | + public AwsToolkitHttpClient build() { |
| 144 | + return new AwsToolkitHttpClient(connectionTimeout, socketTimeout, userAgent, proxy, credentialsProvider); |
| 145 | + } |
| 146 | + |
| 147 | + public Integer getConnectionTimeout() { |
| 148 | + return connectionTimeout; |
| 149 | + } |
| 150 | + |
| 151 | + public AwsToolkitHttpClientBuilder setConnectionTimeout(Integer connectionTimeout) { |
| 152 | + this.connectionTimeout = connectionTimeout; |
| 153 | + return this; |
| 154 | + } |
| 155 | + |
| 156 | + public Integer getSocketTimeout() { |
| 157 | + return socketTimeout; |
| 158 | + } |
| 159 | + |
| 160 | + public AwsToolkitHttpClientBuilder setSocketTimeout(Integer socketTimeout) { |
| 161 | + this.socketTimeout = socketTimeout; |
| 162 | + return this; |
| 163 | + } |
| 164 | + |
| 165 | + public String getUserAgent() { |
| 166 | + return userAgent; |
| 167 | + } |
| 168 | + |
| 169 | + public AwsToolkitHttpClientBuilder setUserAgent(String userAgent) { |
| 170 | + this.userAgent = userAgent; |
| 171 | + return this; |
| 172 | + } |
| 173 | + |
| 174 | + public HttpHost getProxy() { |
| 175 | + return proxy; |
| 176 | + } |
| 177 | + |
| 178 | + public AwsToolkitHttpClientBuilder setProxy(HttpHost proxy) { |
| 179 | + this.proxy = proxy; |
| 180 | + return this; |
| 181 | + } |
| 182 | + |
| 183 | + public CredentialsProvider getCredentialsProvider() { |
| 184 | + return credentialsProvider; |
| 185 | + } |
| 186 | + |
| 187 | + public AwsToolkitHttpClientBuilder setCredentialsProvider(CredentialsProvider credentialsProvider) { |
| 188 | + this.credentialsProvider = credentialsProvider; |
| 189 | + return this; |
| 190 | + } |
| 191 | + } |
| 192 | +} |
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