MimeUtils.java revision 7b3ebefcdf79a251cf2a5619dd2354952fc67665
1/* 2 * Copyright (C) 2010 The Android Open Source Project 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 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package libcore.net; 18 19import java.io.File; 20import java.io.FileInputStream; 21import java.io.IOException; 22import java.io.InputStream; 23import java.security.AccessController; 24import java.security.PrivilegedAction; 25import java.util.HashMap; 26import java.util.Map; 27import java.util.Properties; 28 29/** 30 * Utilities for dealing with MIME types. 31 * Used to implement java.net.URLConnection and android.webkit.MimeTypeMap. 32 */ 33public final class MimeUtils { 34 private static final Map<String, String> mimeTypeToExtensionMap = new HashMap<String, String>(); 35 36 private static final Map<String, String> extensionToMimeTypeMap = new HashMap<String, String>(); 37 38 static { 39 // The following table is based on /etc/mime.types data minus 40 // chemical/* MIME types and MIME types that don't map to any 41 // file extensions. We also exclude top-level domain names to 42 // deal with cases like: 43 // 44 // mail.google.com/a/google.com 45 // 46 // and "active" MIME types (due to potential security issues). 47 48 add("application/andrew-inset", "ez"); 49 add("application/dsptype", "tsp"); 50 add("application/futuresplash", "spl"); 51 add("application/hta", "hta"); 52 add("application/mac-binhex40", "hqx"); 53 add("application/mac-compactpro", "cpt"); 54 add("application/mathematica", "nb"); 55 add("application/msaccess", "mdb"); 56 add("application/oda", "oda"); 57 add("application/ogg", "ogg"); 58 add("application/pdf", "pdf"); 59 add("application/pgp-keys", "key"); 60 add("application/pgp-signature", "pgp"); 61 add("application/pics-rules", "prf"); 62 add("application/rar", "rar"); 63 add("application/rdf+xml", "rdf"); 64 add("application/rss+xml", "rss"); 65 add("application/zip", "zip"); 66 add("application/vnd.android.package-archive", "apk"); 67 add("application/vnd.cinderella", "cdy"); 68 add("application/vnd.ms-pki.stl", "stl"); 69 add("application/vnd.oasis.opendocument.database", "odb"); 70 add("application/vnd.oasis.opendocument.formula", "odf"); 71 add("application/vnd.oasis.opendocument.graphics", "odg"); 72 add("application/vnd.oasis.opendocument.graphics-template", "otg"); 73 add("application/vnd.oasis.opendocument.image", "odi"); 74 add("application/vnd.oasis.opendocument.spreadsheet", "ods"); 75 add("application/vnd.oasis.opendocument.spreadsheet-template", "ots"); 76 add("application/vnd.oasis.opendocument.text", "odt"); 77 add("application/vnd.oasis.opendocument.text-master", "odm"); 78 add("application/vnd.oasis.opendocument.text-template", "ott"); 79 add("application/vnd.oasis.opendocument.text-web", "oth"); 80 add("application/msword", "doc"); 81 add("application/msword", "dot"); 82 add("application/vnd.openxmlformats-officedocument.wordprocessingml.document", "docx"); 83 add("application/vnd.openxmlformats-officedocument.wordprocessingml.template", "dotx"); 84 add("application/vnd.ms-excel", "xls"); 85 add("application/vnd.ms-excel", "xlt"); 86 add("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "xlsx"); 87 add("application/vnd.openxmlformats-officedocument.spreadsheetml.template", "xltx"); 88 add("application/vnd.ms-powerpoint", "ppt"); 89 add("application/vnd.ms-powerpoint", "pot"); 90 add("application/vnd.ms-powerpoint", "pps"); 91 add("application/vnd.openxmlformats-officedocument.presentationml.presentation", "pptx"); 92 add("application/vnd.openxmlformats-officedocument.presentationml.template", "potx"); 93 add("application/vnd.openxmlformats-officedocument.presentationml.slideshow", "ppsx"); 94 add("application/vnd.rim.cod", "cod"); 95 add("application/vnd.smaf", "mmf"); 96 add("application/vnd.stardivision.calc", "sdc"); 97 add("application/vnd.stardivision.draw", "sda"); 98 add("application/vnd.stardivision.impress", "sdd"); 99 add("application/vnd.stardivision.impress", "sdp"); 100 add("application/vnd.stardivision.math", "smf"); 101 add("application/vnd.stardivision.writer", "sdw"); 102 add("application/vnd.stardivision.writer", "vor"); 103 add("application/vnd.stardivision.writer-global", "sgl"); 104 add("application/vnd.sun.xml.calc", "sxc"); 105 add("application/vnd.sun.xml.calc.template", "stc"); 106 add("application/vnd.sun.xml.draw", "sxd"); 107 add("application/vnd.sun.xml.draw.template", "std"); 108 add("application/vnd.sun.xml.impress", "sxi"); 109 add("application/vnd.sun.xml.impress.template", "sti"); 110 add("application/vnd.sun.xml.math", "sxm"); 111 add("application/vnd.sun.xml.writer", "sxw"); 112 add("application/vnd.sun.xml.writer.global", "sxg"); 113 add("application/vnd.sun.xml.writer.template", "stw"); 114 add("application/vnd.visio", "vsd"); 115 add("application/x-abiword", "abw"); 116 add("application/x-apple-diskimage", "dmg"); 117 add("application/x-bcpio", "bcpio"); 118 add("application/x-bittorrent", "torrent"); 119 add("application/x-cdf", "cdf"); 120 add("application/x-cdlink", "vcd"); 121 add("application/x-chess-pgn", "pgn"); 122 add("application/x-cpio", "cpio"); 123 add("application/x-debian-package", "deb"); 124 add("application/x-debian-package", "udeb"); 125 add("application/x-director", "dcr"); 126 add("application/x-director", "dir"); 127 add("application/x-director", "dxr"); 128 add("application/x-dms", "dms"); 129 add("application/x-doom", "wad"); 130 add("application/x-dvi", "dvi"); 131 add("application/x-flac", "flac"); 132 add("application/x-font", "pfa"); 133 add("application/x-font", "pfb"); 134 add("application/x-font", "gsf"); 135 add("application/x-font", "pcf"); 136 add("application/x-font", "pcf.Z"); 137 add("application/x-freemind", "mm"); 138 add("application/x-futuresplash", "spl"); 139 add("application/x-gnumeric", "gnumeric"); 140 add("application/x-go-sgf", "sgf"); 141 add("application/x-graphing-calculator", "gcf"); 142 add("application/x-gtar", "gtar"); 143 add("application/x-gtar", "tgz"); 144 add("application/x-gtar", "taz"); 145 add("application/x-hdf", "hdf"); 146 add("application/x-ica", "ica"); 147 add("application/x-internet-signup", "ins"); 148 add("application/x-internet-signup", "isp"); 149 add("application/x-iphone", "iii"); 150 add("application/x-iso9660-image", "iso"); 151 add("application/x-jmol", "jmz"); 152 add("application/x-kchart", "chrt"); 153 add("application/x-killustrator", "kil"); 154 add("application/x-koan", "skp"); 155 add("application/x-koan", "skd"); 156 add("application/x-koan", "skt"); 157 add("application/x-koan", "skm"); 158 add("application/x-kpresenter", "kpr"); 159 add("application/x-kpresenter", "kpt"); 160 add("application/x-kspread", "ksp"); 161 add("application/x-kword", "kwd"); 162 add("application/x-kword", "kwt"); 163 add("application/x-latex", "latex"); 164 add("application/x-lha", "lha"); 165 add("application/x-lzh", "lzh"); 166 add("application/x-lzx", "lzx"); 167 add("application/x-maker", "frm"); 168 add("application/x-maker", "maker"); 169 add("application/x-maker", "frame"); 170 add("application/x-maker", "fb"); 171 add("application/x-maker", "book"); 172 add("application/x-maker", "fbdoc"); 173 add("application/x-mif", "mif"); 174 add("application/x-ms-wmd", "wmd"); 175 add("application/x-ms-wmz", "wmz"); 176 add("application/x-msi", "msi"); 177 add("application/x-ns-proxy-autoconfig", "pac"); 178 add("application/x-nwc", "nwc"); 179 add("application/x-object", "o"); 180 add("application/x-oz-application", "oza"); 181 add("application/x-pkcs12", "p12"); 182 add("application/x-pkcs7-certreqresp", "p7r"); 183 add("application/x-pkcs7-crl", "crl"); 184 add("application/x-quicktimeplayer", "qtl"); 185 add("application/x-shar", "shar"); 186 add("application/x-shockwave-flash", "swf"); 187 add("application/x-stuffit", "sit"); 188 add("application/x-sv4cpio", "sv4cpio"); 189 add("application/x-sv4crc", "sv4crc"); 190 add("application/x-tar", "tar"); 191 add("application/x-texinfo", "texinfo"); 192 add("application/x-texinfo", "texi"); 193 add("application/x-troff", "t"); 194 add("application/x-troff", "roff"); 195 add("application/x-troff-man", "man"); 196 add("application/x-ustar", "ustar"); 197 add("application/x-wais-source", "src"); 198 add("application/x-wingz", "wz"); 199 add("application/x-webarchive", "webarchive"); 200 add("application/x-webarchive-xml", "webarchivexml"); 201 add("application/x-x509-ca-cert", "crt"); 202 add("application/x-x509-user-cert", "crt"); 203 add("application/x-xcf", "xcf"); 204 add("application/x-xfig", "fig"); 205 add("application/xhtml+xml", "xhtml"); 206 add("audio/3gpp", "3gpp"); 207 add("audio/amr", "amr"); 208 add("audio/basic", "snd"); 209 add("audio/midi", "mid"); 210 add("audio/midi", "midi"); 211 add("audio/midi", "kar"); 212 add("audio/midi", "xmf"); 213 add("audio/mobile-xmf", "mxmf"); 214 add("audio/mpeg", "mpga"); 215 add("audio/mpeg", "mpega"); 216 add("audio/mpeg", "mp2"); 217 add("audio/mpeg", "mp3"); 218 add("audio/mpeg", "m4a"); 219 add("audio/mpegurl", "m3u"); 220 add("audio/prs.sid", "sid"); 221 add("audio/x-aiff", "aif"); 222 add("audio/x-aiff", "aiff"); 223 add("audio/x-aiff", "aifc"); 224 add("audio/x-gsm", "gsm"); 225 add("audio/x-mpegurl", "m3u"); 226 add("audio/x-ms-wma", "wma"); 227 add("audio/x-ms-wax", "wax"); 228 add("audio/x-pn-realaudio", "ra"); 229 add("audio/x-pn-realaudio", "rm"); 230 add("audio/x-pn-realaudio", "ram"); 231 add("audio/x-realaudio", "ra"); 232 add("audio/x-scpls", "pls"); 233 add("audio/x-sd2", "sd2"); 234 add("audio/x-wav", "wav"); 235 add("image/bmp", "bmp"); 236 add("image/gif", "gif"); 237 add("image/ico", "cur"); 238 add("image/ico", "ico"); 239 add("image/ief", "ief"); 240 add("image/jpeg", "jpeg"); 241 add("image/jpeg", "jpg"); 242 add("image/jpeg", "jpe"); 243 add("image/pcx", "pcx"); 244 add("image/png", "png"); 245 add("image/svg+xml", "svg"); 246 add("image/svg+xml", "svgz"); 247 add("image/tiff", "tiff"); 248 add("image/tiff", "tif"); 249 add("image/vnd.djvu", "djvu"); 250 add("image/vnd.djvu", "djv"); 251 add("image/vnd.wap.wbmp", "wbmp"); 252 add("image/x-cmu-raster", "ras"); 253 add("image/x-coreldraw", "cdr"); 254 add("image/x-coreldrawpattern", "pat"); 255 add("image/x-coreldrawtemplate", "cdt"); 256 add("image/x-corelphotopaint", "cpt"); 257 add("image/x-icon", "ico"); 258 add("image/x-jg", "art"); 259 add("image/x-jng", "jng"); 260 add("image/x-ms-bmp", "bmp"); 261 add("image/x-photoshop", "psd"); 262 add("image/x-portable-anymap", "pnm"); 263 add("image/x-portable-bitmap", "pbm"); 264 add("image/x-portable-graymap", "pgm"); 265 add("image/x-portable-pixmap", "ppm"); 266 add("image/x-rgb", "rgb"); 267 add("image/x-xbitmap", "xbm"); 268 add("image/x-xpixmap", "xpm"); 269 add("image/x-xwindowdump", "xwd"); 270 add("model/iges", "igs"); 271 add("model/iges", "iges"); 272 add("model/mesh", "msh"); 273 add("model/mesh", "mesh"); 274 add("model/mesh", "silo"); 275 add("text/calendar", "ics"); 276 add("text/calendar", "icz"); 277 add("text/comma-separated-values", "csv"); 278 add("text/css", "css"); 279 add("text/html", "htm"); 280 add("text/html", "html"); 281 add("text/h323", "323"); 282 add("text/iuls", "uls"); 283 add("text/mathml", "mml"); 284 // add ".txt" first so it will be the default for ExtensionFromMimeType 285 add("text/plain", "txt"); 286 add("text/plain", "asc"); 287 add("text/plain", "text"); 288 add("text/plain", "diff"); 289 add("text/plain", "po"); // reserve "pot" for vnd.ms-powerpoint 290 add("text/richtext", "rtx"); 291 add("text/rtf", "rtf"); 292 add("text/texmacs", "ts"); 293 add("text/text", "phps"); 294 add("text/tab-separated-values", "tsv"); 295 add("text/xml", "xml"); 296 add("text/x-bibtex", "bib"); 297 add("text/x-boo", "boo"); 298 add("text/x-c++hdr", "h++"); 299 add("text/x-c++hdr", "hpp"); 300 add("text/x-c++hdr", "hxx"); 301 add("text/x-c++hdr", "hh"); 302 add("text/x-c++src", "c++"); 303 add("text/x-c++src", "cpp"); 304 add("text/x-c++src", "cxx"); 305 add("text/x-chdr", "h"); 306 add("text/x-component", "htc"); 307 add("text/x-csh", "csh"); 308 add("text/x-csrc", "c"); 309 add("text/x-dsrc", "d"); 310 add("text/x-haskell", "hs"); 311 add("text/x-java", "java"); 312 add("text/x-literate-haskell", "lhs"); 313 add("text/x-moc", "moc"); 314 add("text/x-pascal", "p"); 315 add("text/x-pascal", "pas"); 316 add("text/x-pcs-gcd", "gcd"); 317 add("text/x-setext", "etx"); 318 add("text/x-tcl", "tcl"); 319 add("text/x-tex", "tex"); 320 add("text/x-tex", "ltx"); 321 add("text/x-tex", "sty"); 322 add("text/x-tex", "cls"); 323 add("text/x-vcalendar", "vcs"); 324 add("text/x-vcard", "vcf"); 325 add("video/3gpp", "3gpp"); 326 add("video/3gpp", "3gp"); 327 add("video/3gpp", "3g2"); 328 add("video/dl", "dl"); 329 add("video/dv", "dif"); 330 add("video/dv", "dv"); 331 add("video/fli", "fli"); 332 add("video/m4v", "m4v"); 333 add("video/mpeg", "mpeg"); 334 add("video/mpeg", "mpg"); 335 add("video/mpeg", "mpe"); 336 add("video/mp4", "mp4"); 337 add("video/mpeg", "VOB"); 338 add("video/quicktime", "qt"); 339 add("video/quicktime", "mov"); 340 add("video/vnd.mpegurl", "mxu"); 341 add("video/x-la-asf", "lsf"); 342 add("video/x-la-asf", "lsx"); 343 add("video/x-mng", "mng"); 344 add("video/x-ms-asf", "asf"); 345 add("video/x-ms-asf", "asx"); 346 add("video/x-ms-wm", "wm"); 347 add("video/x-ms-wmv", "wmv"); 348 add("video/x-ms-wmx", "wmx"); 349 add("video/x-ms-wvx", "wvx"); 350 add("video/x-msvideo", "avi"); 351 add("video/x-sgi-movie", "movie"); 352 add("x-conference/x-cooltalk", "ice"); 353 add("x-epoc/x-sisx-app", "sisx"); 354 applyOverrides(); 355 } 356 357 private static void add(String mimeType, String extension) { 358 // 359 // if we have an existing x --> y mapping, we do not want to 360 // override it with another mapping x --> ? 361 // this is mostly because of the way the mime-type map below 362 // is constructed (if a mime type maps to several extensions 363 // the first extension is considered the most popular and is 364 // added first; we do not want to overwrite it later). 365 // 366 if (!mimeTypeToExtensionMap.containsKey(mimeType)) { 367 mimeTypeToExtensionMap.put(mimeType, extension); 368 } 369 extensionToMimeTypeMap.put(extension, mimeType); 370 } 371 372 /** 373 * This isn't what the RI does. The RI doesn't have hard-coded defaults, so supplying your 374 * own "content.types.user.table" means you don't get any of the built-ins, and the built-ins 375 * come from "$JAVA_HOME/lib/content-types.properties". 376 */ 377 private static void applyOverrides() { 378 // Get the appropriate InputStream to read overrides from, if any. 379 InputStream stream = AccessController.doPrivileged(new PrivilegedAction<InputStream>() { 380 public InputStream run() { 381 // User override? 382 String userTable = System.getProperty("content.types.user.table"); 383 if (userTable != null) { 384 File f = new File(userTable); 385 if (f.exists()) { 386 try { 387 return new FileInputStream(f); 388 } catch (IOException ignored) { 389 } 390 } 391 } 392 393 // Standard location? 394 File f = new File(System.getProperty("java.home"), 395 "lib" + File.separator + "content-types.properties"); 396 if (f.exists()) { 397 try { 398 return new FileInputStream(f); 399 } catch (IOException ignored) { 400 } 401 } 402 403 return null; 404 } 405 }); 406 407 if (stream == null) { 408 return; 409 } 410 411 try { 412 try { 413 // Read the properties file... 414 Properties overrides = new Properties(); 415 overrides.load(stream); 416 // And translate its mapping to ours... 417 for (Map.Entry<Object, Object> entry : overrides.entrySet()) { 418 String extension = (String) entry.getKey(); 419 String mimeType = (String) entry.getValue(); 420 add(mimeType, extension); 421 } 422 } finally { 423 stream.close(); 424 } 425 } catch (IOException ignored) { 426 } 427 } 428 429 private MimeUtils() { 430 } 431 432 /** 433 * Returns true if the given MIME type has an entry in the map. 434 * @param mimeType A MIME type (i.e. text/plain) 435 * @return True iff there is a mimeType entry in the map. 436 */ 437 public static boolean hasMimeType(String mimeType) { 438 if (mimeType == null || mimeType.isEmpty()) { 439 return false; 440 } 441 return mimeTypeToExtensionMap.containsKey(mimeType); 442 } 443 444 /** 445 * Returns the MIME type for the given extension. 446 * @param extension A file extension without the leading '.' 447 * @return The MIME type for the given extension or null iff there is none. 448 */ 449 public static String guessMimeTypeFromExtension(String extension) { 450 if (extension == null || extension.isEmpty()) { 451 return null; 452 } 453 return extensionToMimeTypeMap.get(extension); 454 } 455 456 /** 457 * Returns true if the given extension has a registered MIME type. 458 * @param extension A file extension without the leading '.' 459 * @return True iff there is an extension entry in the map. 460 */ 461 public static boolean hasExtension(String extension) { 462 if (extension == null || extension.isEmpty()) { 463 return false; 464 } 465 return extensionToMimeTypeMap.containsKey(extension); 466 } 467 468 /** 469 * Returns the registered extension for the given MIME type. Note that some 470 * MIME types map to multiple extensions. This call will return the most 471 * common extension for the given MIME type. 472 * @param mimeType A MIME type (i.e. text/plain) 473 * @return The extension for the given MIME type or null iff there is none. 474 */ 475 public static String guessExtensionFromMimeType(String mimeType) { 476 if (mimeType == null || mimeType.isEmpty()) { 477 return null; 478 } 479 return mimeTypeToExtensionMap.get(mimeType); 480 } 481} 482