[6380] | 1 | // License: GPL. For details, see LICENSE file.
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[906] | 2 | package org.openstreetmap.josm.io;
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| 3 |
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[2832] | 4 | import static org.openstreetmap.josm.tools.I18n.tr;
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| 5 |
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[906] | 6 | import java.io.BufferedInputStream;
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[9411] | 7 | import java.io.BufferedReader;
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| 8 | import java.io.Closeable;
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[906] | 9 | import java.io.File;
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| 10 | import java.io.FileInputStream;
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[2017] | 11 | import java.io.IOException;
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[906] | 12 | import java.io.InputStream;
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[4262] | 13 | import java.net.HttpURLConnection;
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| 14 | import java.net.MalformedURLException;
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[906] | 15 | import java.net.URL;
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[7089] | 16 | import java.nio.charset.StandardCharsets;
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[9280] | 17 | import java.nio.file.Files;
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| 18 | import java.nio.file.StandardCopyOption;
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[4612] | 19 | import java.util.ArrayList;
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[4022] | 20 | import java.util.Arrays;
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[2889] | 21 | import java.util.Enumeration;
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[4612] | 22 | import java.util.List;
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[8568] | 23 | import java.util.Map;
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| 24 | import java.util.concurrent.ConcurrentHashMap;
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[2889] | 25 | import java.util.zip.ZipEntry;
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| 26 | import java.util.zip.ZipFile;
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[906] | 27 |
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| 28 | import org.openstreetmap.josm.Main;
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[9168] | 29 | import org.openstreetmap.josm.tools.HttpClient;
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[6148] | 30 | import org.openstreetmap.josm.tools.Pair;
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[4812] | 31 | import org.openstreetmap.josm.tools.Utils;
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[906] | 32 |
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| 33 | /**
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[7248] | 34 | * Downloads a file and caches it on disk in order to reduce network load.
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[7434] | 35 | *
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[7248] | 36 | * Supports URLs, local files, and a custom scheme (<code>resource:</code>) to get
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| 37 | * resources from the current *.jar file. (Local caching is only done for URLs.)
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[906] | 38 | * <p>
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[7248] | 39 | * The mirrored file is only downloaded if it has been more than 7 days since
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| 40 | * last download. (Time can be configured.)
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| 41 | * <p>
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| 42 | * The file content is normally accessed with {@link #getInputStream()}, but
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| 43 | * you can also get the mirrored copy with {@link #getFile()}.
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[906] | 44 | */
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[9411] | 45 | public class CachedFile implements Closeable {
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[7248] | 46 |
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[7242] | 47 | /**
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| 48 | * Caching strategy.
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| 49 | */
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| 50 | public enum CachingStrategy {
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| 51 | /**
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| 52 | * If cached file on disk is older than a certain time (7 days by default),
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| 53 | * consider the cache stale and try to download the file again.
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| 54 | */
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[7434] | 55 | MaxAge,
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[7242] | 56 | /**
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| 57 | * Similar to MaxAge, considers the cache stale when a certain age is
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| 58 | * exceeded. In addition, a If-Modified-Since HTTP header is added.
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| 59 | * When the server replies "304 Not Modified", this is considered the same
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| 60 | * as a full download.
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| 61 | */
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[7434] | 62 | IfModifiedSince
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[7242] | 63 | }
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[8510] | 64 |
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[7248] | 65 | protected String name;
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| 66 | protected long maxAge;
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| 67 | protected String destDir;
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| 68 | protected String httpAccept;
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| 69 | protected CachingStrategy cachingStrategy;
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[7434] | 70 |
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[9414] | 71 | private transient boolean fastFail;
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[9411] | 72 | private transient HttpClient activeConnection;
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[8840] | 73 | protected File cacheFile;
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| 74 | protected boolean initialized;
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[4262] | 75 |
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[6889] | 76 | public static final long DEFAULT_MAXTIME = -1L;
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[7242] | 77 | public static final long DAYS = 24*60*60; // factor to get caching time in days
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[906] | 78 |
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[9078] | 79 | private final Map<String, String> httpHeaders = new ConcurrentHashMap<>();
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[8568] | 80 |
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[6867] | 81 | /**
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[7248] | 82 | * Constructs a CachedFile object from a given filename, URL or internal resource.
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[7089] | 83 | *
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[6867] | 84 | * @param name can be:<ul>
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| 85 | * <li>relative or absolute file name</li>
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| 86 | * <li>{@code file:///SOME/FILE} the same as above</li>
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[8401] | 87 | * <li>{@code http://...} a URL. It will be cached on disk.</li>
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[6867] | 88 | * <li>{@code resource://SOME/FILE} file from the classpath (usually in the current *.jar)</li>
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[8401] | 89 | * <li>{@code josmdir://SOME/FILE} file inside josm user data directory (since r7058)</li>
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[7835] | 90 | * <li>{@code josmplugindir://SOME/FILE} file inside josm plugin directory (since r7834)</li></ul>
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[6867] | 91 | */
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[7248] | 92 | public CachedFile(String name) {
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| 93 | this.name = name;
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[1169] | 94 | }
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[906] | 95 |
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[6867] | 96 | /**
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[7248] | 97 | * Set the name of the resource.
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[6867] | 98 | * @param name can be:<ul>
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| 99 | * <li>relative or absolute file name</li>
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| 100 | * <li>{@code file:///SOME/FILE} the same as above</li>
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[8401] | 101 | * <li>{@code http://...} a URL. It will be cached on disk.</li>
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[6867] | 102 | * <li>{@code resource://SOME/FILE} file from the classpath (usually in the current *.jar)</li>
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[8401] | 103 | * <li>{@code josmdir://SOME/FILE} file inside josm user data directory (since r7058)</li>
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[7835] | 104 | * <li>{@code josmplugindir://SOME/FILE} file inside josm plugin directory (since r7834)</li></ul>
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[7248] | 105 | * @return this object
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[6867] | 106 | */
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[7248] | 107 | public CachedFile setName(String name) {
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| 108 | this.name = name;
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| 109 | return this;
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[1169] | 110 | }
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[7434] | 111 |
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[7248] | 112 | /**
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| 113 | * Set maximum age of cache file. Only applies to URLs.
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| 114 | * When this time has passed after the last download of the file, the
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| 115 | * cache is considered stale and a new download will be attempted.
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| 116 | * @param maxAge the maximum cache age in seconds
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| 117 | * @return this object
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| 118 | */
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| 119 | public CachedFile setMaxAge(long maxAge) {
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| 120 | this.maxAge = maxAge;
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| 121 | return this;
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| 122 | }
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[906] | 123 |
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[6867] | 124 | /**
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[7248] | 125 | * Set the destination directory for the cache file. Only applies to URLs.
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| 126 | * @param destDir the destination directory
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| 127 | * @return this object
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[6867] | 128 | */
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[7248] | 129 | public CachedFile setDestDir(String destDir) {
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| 130 | this.destDir = destDir;
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| 131 | return this;
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[1711] | 132 | }
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| 133 |
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[3695] | 134 | /**
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[7248] | 135 | * Set the accepted MIME types sent in the HTTP Accept header. Only applies to URLs.
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| 136 | * @param httpAccept the accepted MIME types
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| 137 | * @return this object
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[3695] | 138 | */
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[7248] | 139 | public CachedFile setHttpAccept(String httpAccept) {
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| 140 | this.httpAccept = httpAccept;
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| 141 | return this;
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[6867] | 142 | }
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| 143 |
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| 144 | /**
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[7248] | 145 | * Set the caching strategy. Only applies to URLs.
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[8470] | 146 | * @param cachingStrategy caching strategy
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[7248] | 147 | * @return this object
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[6867] | 148 | */
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[7248] | 149 | public CachedFile setCachingStrategy(CachingStrategy cachingStrategy) {
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| 150 | this.cachingStrategy = cachingStrategy;
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| 151 | return this;
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[6867] | 152 | }
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| 153 |
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[8568] | 154 | /**
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| 155 | * Sets the http headers. Only applies to URL pointing to http or https resources
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| 156 | * @param headers that should be sent together with request
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| 157 | * @return this object
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| 158 | */
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| 159 | public CachedFile setHttpHeaders(Map<String, String> headers) {
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| 160 | this.httpHeaders.putAll(headers);
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| 161 | return this;
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| 162 | }
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| 163 |
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[9414] | 164 | /**
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| 165 | * Sets whether opening HTTP connections should fail fast, i.e., whether a
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| 166 | * {@link HttpClient#setConnectTimeout(int) low connect timeout} should be used.
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| 167 | * @param fastFail whether opening HTTP connections should fail fast
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| 168 | */
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| 169 | public void setFastFail(boolean fastFail) {
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| 170 | this.fastFail = fastFail;
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| 171 | }
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| 172 |
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[7248] | 173 | public String getName() {
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| 174 | return name;
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| 175 | }
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| 176 |
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| 177 | public long getMaxAge() {
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| 178 | return maxAge;
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| 179 | }
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| 180 |
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| 181 | public String getDestDir() {
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| 182 | return destDir;
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| 183 | }
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| 184 |
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| 185 | public String getHttpAccept() {
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| 186 | return httpAccept;
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| 187 | }
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| 188 |
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| 189 | public CachingStrategy getCachingStrategy() {
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| 190 | return cachingStrategy;
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| 191 | }
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| 192 |
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[6867] | 193 | /**
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[7248] | 194 | * Get InputStream to the requested resource.
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| 195 | * @return the InputStream
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[6867] | 196 | * @throws IOException when the resource with the given name could not be retrieved
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| 197 | */
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[7248] | 198 | public InputStream getInputStream() throws IOException {
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| 199 | File file = getFile();
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| 200 | if (file == null) {
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| 201 | if (name.startsWith("resource://")) {
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| 202 | InputStream is = getClass().getResourceAsStream(
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| 203 | name.substring("resource:/".length()));
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| 204 | if (is == null)
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| 205 | throw new IOException(tr("Failed to open input stream for resource ''{0}''", name));
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| 206 | return is;
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[7853] | 207 | } else {
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[7890] | 208 | throw new IOException("No file found for: "+name);
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[7853] | 209 | }
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[7248] | 210 | }
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| 211 | return new FileInputStream(file);
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[7242] | 212 | }
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| 213 |
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| 214 | /**
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[9411] | 215 | * Returns {@link #getInputStream()} wrapped in a buffered reader.
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[9545] | 216 | * <p>
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[9411] | 217 | * Detects Unicode charset in use utilizing {@link UTFInputStreamReader}.
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| 218 | *
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| 219 | * @return buffered reader
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| 220 | * @throws IOException if any I/O error occurs
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| 221 | * @since 9411
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| 222 | */
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| 223 | public BufferedReader getContentReader() throws IOException {
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| 224 | return new BufferedReader(UTFInputStreamReader.create(getInputStream()));
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| 225 | }
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| 226 |
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| 227 | /**
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[7248] | 228 | * Get local file for the requested resource.
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| 229 | * @return The local cache file for URLs. If the resource is a local file,
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| 230 | * returns just that file.
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[7242] | 231 | * @throws IOException when the resource with the given name could not be retrieved
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| 232 | */
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[7853] | 233 | public synchronized File getFile() throws IOException {
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[7248] | 234 | if (initialized)
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| 235 | return cacheFile;
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| 236 | initialized = true;
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[1169] | 237 | URL url;
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[1523] | 238 | try {
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[1169] | 239 | url = new URL(name);
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[7012] | 240 | if ("file".equals(url.getProtocol())) {
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[8596] | 241 | cacheFile = new File(name.substring("file:/".length() - 1));
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[7248] | 242 | if (!cacheFile.exists()) {
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[8596] | 243 | cacheFile = new File(name.substring("file://".length() - 1));
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[2832] | 244 | }
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[1523] | 245 | } else {
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[7248] | 246 | cacheFile = checkLocal(url);
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[1169] | 247 | }
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[7434] | 248 | } catch (MalformedURLException e) {
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[4812] | 249 | if (name.startsWith("resource://")) {
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[7248] | 250 | return null;
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[7058] | 251 | } else if (name.startsWith("josmdir://")) {
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[7834] | 252 | cacheFile = new File(Main.pref.getUserDataDirectory(), name.substring("josmdir://".length()));
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| 253 | } else if (name.startsWith("josmplugindir://")) {
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| 254 | cacheFile = new File(Main.pref.getPluginsDirectory(), name.substring("josmplugindir://".length()));
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[7058] | 255 | } else {
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[7248] | 256 | cacheFile = new File(name);
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[1169] | 257 | }
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| 258 | }
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[7248] | 259 | if (cacheFile == null)
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[7434] | 260 | throw new IOException("Unable to get cache file for "+name);
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[7248] | 261 | return cacheFile;
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[1169] | 262 | }
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[7434] | 263 |
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[3007] | 264 | /**
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[6148] | 265 | * Looks for a certain entry inside a zip file and returns the entry path.
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| 266 | *
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| 267 | * Replies a file in the top level directory of the ZIP file which has an
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| 268 | * extension <code>extension</code>. If more than one files have this
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| 269 | * extension, the last file whose name includes <code>namepart</code>
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[3007] | 270 | * is opened.
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[3321] | 271 | *
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[3007] | 272 | * @param extension the extension of the file we're looking for
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| 273 | * @param namepart the name part
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[7248] | 274 | * @return The zip entry path of the matching file. Null if this cached file
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| 275 | * doesn't represent a zip file or if there was no matching
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[6148] | 276 | * file in the ZIP file.
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[3007] | 277 | */
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[6148] | 278 | public String findZipEntryPath(String extension, String namepart) {
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| 279 | Pair<String, InputStream> ze = findZipEntryImpl(extension, namepart);
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| 280 | if (ze == null) return null;
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| 281 | return ze.a;
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| 282 | }
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| 283 |
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| 284 | /**
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| 285 | * Like {@link #findZipEntryPath}, but returns the corresponding InputStream.
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[7248] | 286 | * @param extension the extension of the file we're looking for
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| 287 | * @param namepart the name part
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| 288 | * @return InputStream to the matching file. Null if this cached file
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| 289 | * doesn't represent a zip file or if there was no matching
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| 290 | * file in the ZIP file.
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[6985] | 291 | * @since 6148
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[6148] | 292 | */
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| 293 | public InputStream findZipEntryInputStream(String extension, String namepart) {
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| 294 | Pair<String, InputStream> ze = findZipEntryImpl(extension, namepart);
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| 295 | if (ze == null) return null;
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| 296 | return ze.b;
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| 297 | }
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| 298 |
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| 299 | private Pair<String, InputStream> findZipEntryImpl(String extension, String namepart) {
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[7248] | 300 | File file = null;
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| 301 | try {
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| 302 | file = getFile();
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| 303 | } catch (IOException ex) {
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[8073] | 304 | Main.warn(ex, false);
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[7248] | 305 | }
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[3011] | 306 | if (file == null)
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| 307 | return null;
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[6148] | 308 | Pair<String, InputStream> res = null;
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[2889] | 309 | try {
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[7089] | 310 | ZipFile zipFile = new ZipFile(file, StandardCharsets.UTF_8);
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[3007] | 311 | ZipEntry resentry = null;
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| 312 | Enumeration<? extends ZipEntry> entries = zipFile.entries();
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| 313 | while (entries.hasMoreElements()) {
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| 314 | ZipEntry entry = entries.nextElement();
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[8846] | 315 | if (entry.getName().endsWith('.' + extension)) {
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[3007] | 316 | /* choose any file with correct extension. When more than
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[2889] | 317 | one file, prefer the one which matches namepart */
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[3007] | 318 | if (resentry == null || entry.getName().indexOf(namepart) >= 0) {
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| 319 | resentry = entry;
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[2889] | 320 | }
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| 321 | }
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| 322 | }
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[3007] | 323 | if (resentry != null) {
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[6148] | 324 | InputStream is = zipFile.getInputStream(resentry);
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| 325 | res = Pair.create(resentry.getName(), is);
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[3007] | 326 | } else {
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[5874] | 327 | Utils.close(zipFile);
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[3007] | 328 | }
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[2889] | 329 | } catch (Exception e) {
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[6248] | 330 | if (file.getName().endsWith(".zip")) {
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| 331 | Main.warn(tr("Failed to open file with extension ''{2}'' and namepart ''{3}'' in zip file ''{0}''. Exception was: {1}",
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[3321] | 332 | file.getName(), e.toString(), extension, namepart));
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[3041] | 333 | }
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[2889] | 334 | }
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| 335 | return res;
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| 336 | }
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| 337 |
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[7081] | 338 | /**
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[7248] | 339 | * Clear the cache for the given resource.
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| 340 | * This forces a fresh download.
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[7434] | 341 | * @param name the URL
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[7081] | 342 | */
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[6310] | 343 | public static void cleanup(String name) {
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[2832] | 344 | cleanup(name, null);
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[1747] | 345 | }
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[7089] | 346 |
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[7248] | 347 | /**
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| 348 | * Clear the cache for the given resource.
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| 349 | * This forces a fresh download.
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| 350 | * @param name the URL
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| 351 | * @param destDir the destination directory (see {@link #setDestDir(java.lang.String)})
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| 352 | */
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[6310] | 353 | public static void cleanup(String name, String destDir) {
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[1747] | 354 | URL url;
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| 355 | try {
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| 356 | url = new URL(name);
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[7012] | 357 | if (!"file".equals(url.getProtocol())) {
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[3695] | 358 | String prefKey = getPrefKey(url, destDir);
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[7005] | 359 | List<String> localPath = new ArrayList<>(Main.pref.getCollection(prefKey));
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[4638] | 360 | if (localPath.size() == 2) {
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| 361 | File lfile = new File(localPath.get(1));
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[8510] | 362 | if (lfile.exists()) {
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[9296] | 363 | Utils.deleteFile(lfile);
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[2832] | 364 | }
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[1747] | 365 | }
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[4812] | 366 | Main.pref.putCollection(prefKey, null);
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[1747] | 367 | }
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[6310] | 368 | } catch (MalformedURLException e) {
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| 369 | Main.warn(e);
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| 370 | }
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[1747] | 371 | }
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| 372 |
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[3695] | 373 | /**
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[7248] | 374 | * Get preference key to store the location and age of the cached file.
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[3695] | 375 | * 2 resources that point to the same url, but that are to be stored in different
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| 376 | * directories will not share a cache file.
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[8929] | 377 | * @param url URL
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| 378 | * @param destDir destination directory
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| 379 | * @return Preference key
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[3695] | 380 | */
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| 381 | private static String getPrefKey(URL url, String destDir) {
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| 382 | StringBuilder prefKey = new StringBuilder("mirror.");
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| 383 | if (destDir != null) {
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[8390] | 384 | prefKey.append(destDir).append('.');
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[3695] | 385 | }
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| 386 | prefKey.append(url.toString());
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[8510] | 387 | return prefKey.toString().replaceAll("=", "_");
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[3695] | 388 | }
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| 389 |
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[7248] | 390 | private File checkLocal(URL url) throws IOException {
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[3695] | 391 | String prefKey = getPrefKey(url, destDir);
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[7434] | 392 | String urlStr = url.toExternalForm();
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[4128] | 393 | long age = 0L;
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[7248] | 394 | long lMaxAge = maxAge;
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[7242] | 395 | Long ifModifiedSince = null;
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[4262] | 396 | File localFile = null;
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[7005] | 397 | List<String> localPathEntry = new ArrayList<>(Main.pref.getCollection(prefKey));
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[7434] | 398 | boolean offline = false;
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| 399 | try {
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| 400 | checkOfflineAccess(urlStr);
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| 401 | } catch (OfflineAccessException e) {
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| 402 | offline = true;
|
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| 403 | }
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[4612] | 404 | if (localPathEntry.size() == 2) {
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| 405 | localFile = new File(localPathEntry.get(1));
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[7434] | 406 | if (!localFile.exists()) {
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[4262] | 407 | localFile = null;
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[7434] | 408 | } else {
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[8443] | 409 | if (maxAge == DEFAULT_MAXTIME
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[7248] | 410 | || maxAge <= 0 // arbitrary value <= 0 is deprecated
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[4240] | 411 | ) {
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[7248] | 412 | lMaxAge = Main.pref.getInteger("mirror.maxtime", 7*24*60*60); // one week
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[3877] | 413 | }
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[4612] | 414 | age = System.currentTimeMillis() - Long.parseLong(localPathEntry.get(0));
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[7434] | 415 | if (offline || age < lMaxAge*1000) {
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[4262] | 416 | return localFile;
|
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[3877] | 417 | }
|
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[7248] | 418 | if (cachingStrategy == CachingStrategy.IfModifiedSince) {
|
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[8390] | 419 | ifModifiedSince = Long.valueOf(localPathEntry.get(0));
|
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[7242] | 420 | }
|
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[1169] | 421 | }
|
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| 422 | }
|
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[4812] | 423 | if (destDir == null) {
|
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| 424 | destDir = Main.pref.getCacheDirectory().getPath();
|
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[2832] | 425 | }
|
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[906] | 426 |
|
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[1169] | 427 | File destDirFile = new File(destDir);
|
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[2832] | 428 | if (!destDirFile.exists()) {
|
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[1169] | 429 | destDirFile.mkdirs();
|
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[2832] | 430 | }
|
---|
[7434] | 431 |
|
---|
| 432 | // No local file + offline => nothing to do
|
---|
| 433 | if (offline) {
|
---|
| 434 | return null;
|
---|
| 435 | }
|
---|
| 436 |
|
---|
| 437 | String a = urlStr.replaceAll("[^A-Za-z0-9_.-]", "_");
|
---|
[4022] | 438 | String localPath = "mirror_" + a;
|
---|
[1169] | 439 | destDirFile = new File(destDir, localPath + ".tmp");
|
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[1523] | 440 | try {
|
---|
[9411] | 441 | activeConnection = HttpClient.create(url)
|
---|
[9168] | 442 | .setAccept(httpAccept)
|
---|
| 443 | .setIfModifiedSince(ifModifiedSince == null ? 0L : ifModifiedSince)
|
---|
[9411] | 444 | .setHeaders(httpHeaders);
|
---|
[9414] | 445 | if (fastFail) {
|
---|
| 446 | activeConnection.setReadTimeout(1000);
|
---|
| 447 | }
|
---|
[9411] | 448 | final HttpClient.Response con = activeConnection.connect();
|
---|
[7242] | 449 | if (ifModifiedSince != null && con.getResponseCode() == HttpURLConnection.HTTP_NOT_MODIFIED) {
|
---|
[7434] | 450 | if (Main.isDebugEnabled()) {
|
---|
[8846] | 451 | Main.debug("304 Not Modified ("+urlStr+')');
|
---|
[7434] | 452 | }
|
---|
| 453 | if (localFile == null)
|
---|
| 454 | throw new AssertionError();
|
---|
| 455 | Main.pref.putCollection(prefKey,
|
---|
[7242] | 456 | Arrays.asList(Long.toString(System.currentTimeMillis()), localPathEntry.get(1)));
|
---|
| 457 | return localFile;
|
---|
[7434] | 458 | }
|
---|
[9280] | 459 | try (InputStream bis = new BufferedInputStream(con.getContent())) {
|
---|
| 460 | Files.copy(bis, destDirFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
|
---|
[2832] | 461 | }
|
---|
[9411] | 462 | activeConnection = null;
|
---|
[4262] | 463 | localFile = new File(destDir, localPath);
|
---|
[7434] | 464 | if (Main.platform.rename(destDirFile, localFile)) {
|
---|
| 465 | Main.pref.putCollection(prefKey,
|
---|
[7242] | 466 | Arrays.asList(Long.toString(System.currentTimeMillis()), localFile.toString()));
|
---|
[4145] | 467 | } else {
|
---|
[6248] | 468 | Main.warn(tr("Failed to rename file {0} to {1}.",
|
---|
[4262] | 469 | destDirFile.getPath(), localFile.getPath()));
|
---|
[4145] | 470 | }
|
---|
[4128] | 471 | } catch (IOException e) {
|
---|
[7248] | 472 | if (age >= lMaxAge*1000 && age < lMaxAge*1000*2) {
|
---|
[7434] | 473 | Main.warn(tr("Failed to load {0}, use cached file and retry next time: {1}", urlStr, e));
|
---|
[4262] | 474 | return localFile;
|
---|
[4128] | 475 | } else {
|
---|
| 476 | throw e;
|
---|
| 477 | }
|
---|
[1169] | 478 | }
|
---|
[906] | 479 |
|
---|
[4262] | 480 | return localFile;
|
---|
[1169] | 481 | }
|
---|
[4262] | 482 |
|
---|
[7434] | 483 | private static void checkOfflineAccess(String urlString) {
|
---|
| 484 | OnlineResource.JOSM_WEBSITE.checkOfflineAccess(urlString, Main.getJOSMWebsite());
|
---|
[9353] | 485 | OnlineResource.OSM_API.checkOfflineAccess(urlString, OsmApi.getOsmApi().getServerUrl());
|
---|
[7434] | 486 | }
|
---|
| 487 |
|
---|
[9411] | 488 | /**
|
---|
| 489 | * Attempts to disconnect an URL connection.
|
---|
| 490 | * @see HttpClient#disconnect()
|
---|
| 491 | * @since 9411
|
---|
| 492 | */
|
---|
| 493 | @Override
|
---|
| 494 | public void close() {
|
---|
| 495 | if (activeConnection != null) {
|
---|
| 496 | activeConnection.disconnect();
|
---|
| 497 | }
|
---|
| 498 | }
|
---|
[906] | 499 | }
|
---|