1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
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2 | package org.openstreetmap.josm.io;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.io.BufferedInputStream;
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7 | import java.io.BufferedOutputStream;
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8 | import java.io.File;
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9 | import java.io.FileInputStream;
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10 | import java.io.FileOutputStream;
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11 | import java.io.IOException;
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12 | import java.io.InputStream;
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13 | import java.net.URL;
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14 | import java.net.URLConnection;
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15 |
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16 | import org.openstreetmap.josm.Main;
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17 |
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18 | /**
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19 | * Mirrors a file to a local file.
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20 | * <p>
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21 | * The file mirrored is only downloaded if it has been more than one day since last download
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22 | */
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23 | public class MirroredInputStream extends InputStream {
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24 | InputStream fs = null;
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25 | File file = null;
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26 |
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27 | public MirroredInputStream(String name) throws IOException {
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28 | this(name, null, -1L);
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29 | }
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30 |
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31 | public MirroredInputStream(String name, long maxTime) throws IOException {
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32 | this(name, null, maxTime);
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33 | }
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34 |
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35 | public MirroredInputStream(String name, String destDir) throws IOException {
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36 | this(name, destDir, -1L);
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37 | }
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38 |
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39 | public MirroredInputStream(String name, String destDir, long maxTime) throws IOException {
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40 | URL url;
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41 | try {
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42 | url = new URL(name);
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43 | if (url.getProtocol().equals("file")) {
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44 | file = new File(name.substring("file:/".length()));
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45 | if (!file.exists()) {
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46 | file = new File(name.substring("file://".length()));
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47 | }
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48 | } else {
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49 | file = checkLocal(url, destDir, maxTime);
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50 | }
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51 | } catch (java.net.MalformedURLException e) {
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52 | if(name.startsWith("resource://")) {
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53 | fs = getClass().getResourceAsStream(
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54 | name.substring("resource:/".length()));
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55 | if (fs == null)
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56 | throw new IOException(tr("Failed to open input stream for resource ''{0}''", name));
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57 | return;
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58 | }
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59 | file = new File(name);
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60 | }
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61 | if (file == null)
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62 | throw new IOException();
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63 | fs = new FileInputStream(file);
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64 | }
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65 |
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66 | public File getFile()
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67 | {
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68 | return file;
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69 | }
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70 |
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71 | static public void cleanup(String name)
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72 | {
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73 | cleanup(name, null);
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74 | }
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75 | static public void cleanup(String name, String destDir)
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76 | {
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77 | URL url;
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78 | try {
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79 | url = new URL(name);
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80 | if (!url.getProtocol().equals("file"))
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81 | {
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82 | String localPath = Main.pref.get("mirror." + url);
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83 | if (localPath != null && localPath.length() > 0)
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84 | {
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85 | String[] lp = localPath.split(";");
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86 | File lfile = new File(lp[1]);
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87 | if(lfile.exists()) {
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88 | lfile.delete();
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89 | }
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90 | }
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91 | Main.pref.put("mirror." + url, null);
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92 | }
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93 | } catch (java.net.MalformedURLException e) {}
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94 | }
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95 |
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96 | private File checkLocal(URL url, String destDir, long maxTime) {
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97 | String localPath = Main.pref.get("mirror." + url);
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98 | File file = null;
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99 | if (localPath != null && localPath.length() > 0) {
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100 | String[] lp = localPath.split(";");
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101 | file = new File(lp[1]);
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102 | if (maxTime <= 0) {
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103 | maxTime = Main.pref.getInteger("mirror.maxtime", 7*24*60*60);
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104 | }
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105 | if (System.currentTimeMillis() - Long.parseLong(lp[0]) < maxTime*1000) {
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106 | if(file.exists())
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107 | return file;
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108 | }
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109 | }
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110 | if(destDir == null) {
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111 | destDir = Main.pref.getPreferencesDir();
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112 | }
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113 |
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114 | File destDirFile = new File(destDir);
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115 | if (!destDirFile.exists()) {
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116 | destDirFile.mkdirs();
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117 | }
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118 |
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119 | String a = url.toString().replaceAll("[^A-Za-z0-9_.-]", "_");
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120 | localPath = "mirror_" + a;
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121 | destDirFile = new File(destDir, localPath + ".tmp");
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122 | BufferedOutputStream bos = null;
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123 | BufferedInputStream bis = null;
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124 | try {
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125 | URLConnection conn = url.openConnection();
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126 | conn.setConnectTimeout(5000);
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127 | bis = new BufferedInputStream(conn.getInputStream());
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128 | bos = new BufferedOutputStream( new FileOutputStream(destDirFile));
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129 | byte[] buffer = new byte[4096];
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130 | int length;
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131 | while ((length = bis.read(buffer)) > -1) {
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132 | bos.write(buffer, 0, length);
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133 | }
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134 | } catch(IOException ioe) {
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135 | if (file != null)
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136 | return file;
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137 | return null;
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138 | } finally {
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139 | if (bis != null) {
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140 | try {
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141 | bis.close();
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142 | } catch (IOException e) {
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143 | e.printStackTrace();
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144 | }
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145 | }
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146 | if (bos != null) {
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147 | try {
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148 | bos.close();
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149 | } catch (IOException e) {
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150 | e.printStackTrace();
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151 | }
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152 | }
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153 | file = new File(destDir, localPath);
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154 | destDirFile.renameTo(file);
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155 | Main.pref.put("mirror." + url, System.currentTimeMillis() + ";" + file);
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156 | }
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157 |
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158 | return file;
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159 | }
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160 | @Override
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161 | public int available() throws IOException
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162 | { return fs.available(); }
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163 | @Override
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164 | public void close() throws IOException
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165 | { fs.close(); }
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166 | @Override
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167 | public int read() throws IOException
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168 | { return fs.read(); }
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169 | @Override
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170 | public int read(byte[] b) throws IOException
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171 | { return fs.read(b); }
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172 | @Override
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173 | public int read(byte[] b, int off, int len) throws IOException
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174 | { return fs.read(b,off, len); }
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175 | @Override
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176 | public long skip(long n) throws IOException
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177 | { return fs.skip(n); }
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178 | }
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