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annotate mxtool/URLConnectionDownload.java @ 21972:ff6f34159b8a

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Providing package-info for most of API packages. Feel free to provide your package-info.java for anything that has API in its name.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Tue, 23 Jun 2015 12:44:41 +0200
parents 07462ba5a12a
children
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 import java.io.*;
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24 import java.net.*;
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25 import java.util.*;
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26 import java.util.regex.*;
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27
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28 /**
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29 * Downloads content from a given URL to a given file.
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30 *
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31 * @param path where to write the content
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32 * @param urls the URLs to try, stopping after the first successful one
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33 */
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34 public class URLConnectionDownload {
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35 /**
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36 * Iterate over list of environment variable to find one that correctly specify an proxy.
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37 *
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38 * @param propPrefix indicates which proxy property to set (i.e., http or https)
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39 * @param proxyEnvVariableNames list of environment variable
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40 * @return a string specifying the proxy url
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41 */
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42 private static String setProxy(String[] proxyEnvVariableNames, String propPrefix) {
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43 String proxy = null;
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44 String proxyEnvVar = "";
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45 for (String envvar : proxyEnvVariableNames) {
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46 proxy = System.getenv(envvar);
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47 if (proxy != null) {
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48 proxyEnvVar = envvar;
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49 break;
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50 }
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51 }
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52 if (proxy != null) {
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53 Pattern p = Pattern.compile("(?:http://)?([^:]+)(:\\d+)?");
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54 Matcher m = p.matcher(proxy);
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55 if (m.matches()) {
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56 String host = m.group(1);
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57 String port = m.group(2);
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58 System.setProperty(propPrefix + ".proxyHost", host);
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59 if (port != null) {
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60 port = port.substring(1); // strip ':'
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61 System.setProperty(propPrefix + ".proxyPort", port);
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62 }
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63 return proxy;
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64 } else {
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65 System.err.println("Value of " + proxyEnvVar + " is not valid: " + proxy);
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66 }
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67 } else {
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68 System.err.println("** If behind a firewall without direct internet access, use the " + proxyEnvVariableNames[0] + " environment variable (e.g. 'env " + proxyEnvVariableNames[0] +
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69 "=proxy.company.com:80 max ...') or download manually with a web browser.");
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70 }
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71 return "";
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72 }
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73
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74 /**
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75 * Downloads content from a given URL to a given file.
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76 *
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77 * @param args arg[0] is the path where to write the content. The remainder of args are the URLs
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78 * to try, stopping after the first successful one
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79 */
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80 public static void main(String[] args) {
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81 File path = new File(args[0]);
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82 boolean verbose = args[1].equals("-v");
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83 int offset = verbose ? 2 : 1;
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84 String[] urls = new String[args.length - offset];
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85 System.arraycopy(args, offset, urls, 0, urls.length);
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86
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87 File parent = path.getParentFile();
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88 makeDirectory(parent);
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89
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90 // Enable use of system proxies
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91 System.setProperty("java.net.useSystemProxies", "true");
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92
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93 // Set standard proxy if any
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94 String proxy = setProxy(new String[]{"HTTP_PROXY", "http_proxy"}, "http");
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95 // Set proxy for secure http if explicitely set, default to http proxy otherwise
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96 String secureProxy = setProxy(new String[]{"HTTPS_PROXY", "https_proxy", "HTTP_PROXY", "http_proxy"}, "https");
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97 String proxyMsg = "";
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98 if (secureProxy.length() > 0 && proxy.length() > 0 && !secureProxy.equals(proxy)) {
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99 proxyMsg = " via " + proxy + " / " + secureProxy;
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100 } else if (proxy.length() > 0) {
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101 proxyMsg = " via " + proxy;
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102 } else if (secureProxy.length() > 0) {
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103 proxyMsg = " via " + secureProxy;
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104 }
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105
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106 for (String s : urls) {
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107 try {
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108 while (true) {
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109 System.err.println("Downloading " + s + " to " + path + proxyMsg);
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110 URL url = new URL(s);
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111 URLConnection conn = url.openConnection();
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112 // 10 second timeout to establish connection
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113 conn.setConnectTimeout(10000);
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114
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115 if (conn instanceof HttpURLConnection) {
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116 // HttpURLConnection per default follows redirections,
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117 // but not if it changes the protocol (e.g. http ->
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118 // https). While this is a sane default, in our
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119 // situation it's okay to follow a protocol transition.
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120 HttpURLConnection httpconn = (HttpURLConnection) conn;
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121 switch (httpconn.getResponseCode()) {
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122 case HttpURLConnection.HTTP_MOVED_PERM:
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123 case HttpURLConnection.HTTP_MOVED_TEMP:
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124 System.err.println("follow redirect...");
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125 s = httpconn.getHeaderField("Location");
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126 continue;
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127 }
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128 }
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129 InputStream in = conn.getInputStream();
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130 int size = conn.getContentLength();
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131 FileOutputStream out = new FileOutputStream(path);
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132 int read = 0;
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133 byte[] buf = new byte[8192];
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134 int n = 0;
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135 while ((read = in.read(buf)) != -1) {
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136 n += read;
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137 if (verbose) {
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138 long percent = ((long) n * 100 / size);
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139 System.err.print("\r " + n + " bytes " + (size == -1 ? "" : " (" + percent + "%)"));
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140 }
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141 out.write(buf, 0, read);
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142 }
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143 System.err.println();
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144 out.close();
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145 in.close();
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146 return;
3723
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147 }
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148 } catch (MalformedURLException e) {
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149 throw new Error("Error in URL " + s, e);
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150 } catch (IOException e) {
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151 System.err.println("Error reading from " + s + ": " + e);
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152 path.delete();
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153 }
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154 }
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155 throw new Error("Could not download content to " + path + " from " + Arrays.toString(urls));
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156 }
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157
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158 private static void makeDirectory(File directory) {
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159 if (!directory.exists() && !directory.mkdirs()) {
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160 throw new Error("Could not make directory " + directory);
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161 }
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162 }
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163 }