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 */
16package eu.siacs.conversations.utils;
17
18import android.content.Context;
19import android.database.Cursor;
20import android.net.Uri;
21import android.provider.OpenableColumns;
22import android.util.Log;
23
24import com.google.common.base.Strings;
25import com.google.common.collect.ImmutableList;
26
27import java.io.File;
28import java.io.FileInputStream;
29import java.io.IOException;
30import java.io.InputStream;
31import java.util.Arrays;
32import java.util.Collection;
33import java.util.HashMap;
34import java.util.List;
35import java.util.Map;
36import java.util.Properties;
37
38import eu.siacs.conversations.Config;
39import eu.siacs.conversations.entities.Transferable;
40import eu.siacs.conversations.worker.ExportBackupWorker;
41
42/**
43 * Utilities for dealing with MIME types.
44 * Used to implement java.net.URLConnection and android.webkit.MimeTypeMap.
45 */
46public final class MimeUtils {
47
48 public static final List<String> AMBIGUOUS_CONTAINER_FORMATS = ImmutableList.of(
49 "application/ogg",
50 "video/3gpp", // .3gp files can contain audio, video or both
51 "video/3gpp2"
52 );
53
54 private static final Map<String, String> mimeTypeToExtensionMap = new HashMap<>();
55 private static final Map<String, String> extensionToMimeTypeMap = new HashMap<>();
56
57 static {
58 // The following table is based on /etc/mime.types data minus
59 // chemical/* MIME types and MIME types that don't map to any
60 // file extensions. We also exclude top-level domain names to
61 // deal with cases like:
62 //
63 // mail.google.com/a/google.com
64 //
65 // and "active" MIME types (due to potential security issues).
66 // Note that this list is _not_ in alphabetical order and must not be sorted.
67 // The "most popular" extension must come first, so that it's the one returned
68 // by guessExtensionFromMimeType.
69 add("application/andrew-inset", "ez");
70 add("application/dsptype", "tsp");
71 add("application/json", "json");
72 add("application/epub+zip", "epub");
73 add("application/gpx+xml", "gpx");
74 add("application/hta", "hta");
75 add("application/mac-binhex40", "hqx");
76 add("application/mathematica", "nb");
77 add("application/msaccess", "mdb");
78 add("application/oda", "oda");
79 add("application/ogg", "ogg");
80 add("application/pdf", "pdf");
81 add("application/pgp-keys", "key");
82 add("application/pgp-signature", "pgp");
83 add("application/pics-rules", "prf");
84 add("application/pkix-cert", "cer");
85 add("application/rar", "rar");
86 add("application/rdf+xml", "rdf");
87 add("application/rss+xml", "rss");
88 add("application/zip", "zip");
89 add("application/vnd.amazon.mobi8-ebook", "azw3");
90 add("application/vnd.amazon.mobi8-ebook", "azw");
91 add("application/vnd.amazon.mobi8-ebook", "kfx");
92 add("application/vnd.android.package-archive", "apk");
93 add("application/vnd.cinderella", "cdy");
94 add(ExportBackupWorker.MIME_TYPE, "ceb");
95 add("application/vnd.ms-pki.stl", "stl");
96 add("application/vnd.oasis.opendocument.database", "odb");
97 add("application/vnd.oasis.opendocument.formula", "odf");
98 add("application/vnd.oasis.opendocument.graphics", "odg");
99 add("application/vnd.oasis.opendocument.graphics-template", "otg");
100 add("application/vnd.oasis.opendocument.image", "odi");
101 add("application/vnd.oasis.opendocument.spreadsheet", "ods");
102 add("application/vnd.oasis.opendocument.spreadsheet-template", "ots");
103 add("application/vnd.oasis.opendocument.text", "odt");
104 add("application/vnd.oasis.opendocument.text-master", "odm");
105 add("application/vnd.oasis.opendocument.text-template", "ott");
106 add("application/vnd.oasis.opendocument.text-web", "oth");
107 add("application/vnd.google-earth.kml+xml", "kml");
108 add("application/vnd.google-earth.kmz", "kmz");
109 add("application/msword", "doc");
110 add("application/msword", "dot");
111 add("application/vnd.openxmlformats-officedocument.wordprocessingml.document", "docx");
112 add("application/vnd.openxmlformats-officedocument.wordprocessingml.template", "dotx");
113 add("application/vnd.ms-excel", "xls");
114 add("application/vnd.ms-excel", "xlt");
115 add("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "xlsx");
116 add("application/vnd.openxmlformats-officedocument.spreadsheetml.template", "xltx");
117 add("application/vnd.ms-powerpoint", "ppt");
118 add("application/vnd.ms-powerpoint", "pot");
119 add("application/vnd.ms-powerpoint", "pps");
120 add("application/vnd.openxmlformats-officedocument.presentationml.presentation", "pptx");
121 add("application/vnd.openxmlformats-officedocument.presentationml.template", "potx");
122 add("application/vnd.openxmlformats-officedocument.presentationml.slideshow", "ppsx");
123 add("application/vnd.rim.cod", "cod");
124 add("application/vnd.smaf", "mmf");
125 add("application/vnd.stardivision.calc", "sdc");
126 add("application/vnd.stardivision.draw", "sda");
127 add("application/vnd.stardivision.impress", "sdd");
128 add("application/vnd.stardivision.impress", "sdp");
129 add("application/vnd.stardivision.math", "smf");
130 add("application/vnd.stardivision.writer", "sdw");
131 add("application/vnd.stardivision.writer", "vor");
132 add("application/vnd.stardivision.writer-global", "sgl");
133 add("application/vnd.sun.xml.calc", "sxc");
134 add("application/vnd.sun.xml.calc.template", "stc");
135 add("application/vnd.sun.xml.draw", "sxd");
136 add("application/vnd.sun.xml.draw.template", "std");
137 add("application/vnd.sun.xml.impress", "sxi");
138 add("application/vnd.sun.xml.impress.template", "sti");
139 add("application/vnd.sun.xml.math", "sxm");
140 add("application/vnd.sun.xml.writer", "sxw");
141 add("application/vnd.sun.xml.writer.global", "sxg");
142 add("application/vnd.sun.xml.writer.template", "stw");
143 add("application/vnd.visio", "vsd");
144 add("application/x-abiword", "abw");
145 add("application/x-apple-diskimage", "dmg");
146 add("application/x-bcpio", "bcpio");
147 add("application/x-bittorrent", "torrent");
148 add("application/x-cdf", "cdf");
149 add("application/x-cdlink", "vcd");
150 add("application/x-chess-pgn", "pgn");
151 add("application/x-cpio", "cpio");
152 add("application/x-debian-package", "deb");
153 add("application/x-debian-package", "udeb");
154 add("application/x-director", "dcr");
155 add("application/x-director", "dir");
156 add("application/x-director", "dxr");
157 add("application/x-dms", "dms");
158 add("application/x-doom", "wad");
159 add("application/x-dvi", "dvi");
160 add("application/x-font", "pfa");
161 add("application/x-font", "pfb");
162 add("application/x-font", "gsf");
163 add("application/x-font", "pcf");
164 add("application/x-font", "pcf.Z");
165 add("application/x-freemind", "mm");
166 // application/futuresplash isn't IANA, so application/x-futuresplash should come first.
167 add("application/x-futuresplash", "spl");
168 add("application/futuresplash", "spl");
169 add("application/x-gnumeric", "gnumeric");
170 add("application/x-go-sgf", "sgf");
171 add("application/x-graphing-calculator", "gcf");
172 add("application/x-gtar", "tgz");
173 add("application/x-gtar", "gtar");
174 add("application/x-gtar", "taz");
175 add("application/x-hdf", "hdf");
176 add("application/x-ica", "ica");
177 add("application/x-internet-signup", "ins");
178 add("application/x-internet-signup", "isp");
179 add("application/x-iphone", "iii");
180 add("application/x-iso9660-image", "iso");
181 add("application/x-jmol", "jmz");
182 add("application/x-kchart", "chrt");
183 add("application/x-killustrator", "kil");
184 add("application/x-koan", "skp");
185 add("application/x-koan", "skd");
186 add("application/x-koan", "skt");
187 add("application/x-koan", "skm");
188 add("application/x-kpresenter", "kpr");
189 add("application/x-kpresenter", "kpt");
190 add("application/x-kspread", "ksp");
191 add("application/x-kword", "kwd");
192 add("application/x-kword", "kwt");
193 add("application/x-latex", "latex");
194 add("application/x-lha", "lha");
195 add("application/x-lzh", "lzh");
196 add("application/x-lzx", "lzx");
197 add("application/x-maker", "frm");
198 add("application/x-maker", "maker");
199 add("application/x-maker", "frame");
200 add("application/x-maker", "fb");
201 add("application/x-maker", "book");
202 add("application/x-maker", "fbdoc");
203 add("application/x-mif", "mif");
204 add("application/x-mobipocket-ebook", "mobi");
205 add("application/x-ms-wmd", "wmd");
206 add("application/x-ms-wmz", "wmz");
207 add("application/x-msi", "msi");
208 add("application/x-ns-proxy-autoconfig", "pac");
209 add("application/x-nwc", "nwc");
210 add("application/x-object", "o");
211 add("application/x-oz-application", "oza");
212 add("application/x-pem-file", "pem");
213 add("application/x-pkcs12", "p12");
214 add("application/x-pkcs12", "pfx");
215 add("application/x-pkcs7-certreqresp", "p7r");
216 add("application/x-pkcs7-crl", "crl");
217 add("application/x-quicktimeplayer", "qtl");
218 add("application/x-shar", "shar");
219 add("application/x-shockwave-flash", "swf");
220 add("application/x-stuffit", "sit");
221 add("application/x-sv4cpio", "sv4cpio");
222 add("application/x-sv4crc", "sv4crc");
223 add("application/x-tar", "tar");
224 add("application/x-texinfo", "texinfo");
225 add("application/x-texinfo", "texi");
226 add("application/x-troff", "t");
227 add("application/x-troff", "roff");
228 add("application/x-troff-man", "man");
229 add("application/x-ustar", "ustar");
230 add("application/x-wais-source", "src");
231 add("application/x-wingz", "wz");
232 add("application/x-webarchive", "webarchive");
233 add("application/x-webarchive-xml", "webarchivexml");
234 add("application/x-x509-ca-cert", "crt");
235 add("application/x-x509-user-cert", "crt");
236 add("application/x-x509-server-cert", "crt");
237 add("application/x-xcf", "xcf");
238 add("application/x-xfig", "fig");
239 add("application/xdc+zip", "xdc");
240 add("application/xhtml+xml", "xhtml");
241 add("video/3gpp", "3gpp");
242 add("video/3gpp", "3gp");
243 add("video/3gpp2", "3gpp2");
244 add("video/3gpp2", "3g2");
245 add("audio/3gpp", "3gpp");
246 add("audio/3gpp", "3gp");
247 add("audio/aac", "aac");
248 add("audio/aac-adts", "aac");
249 add("audio/amr", "amr");
250 add("audio/amr-wb", "awb");
251 add("audio/basic", "snd");
252 add("audio/flac", "flac");
253 add("application/x-flac", "flac");
254 add("audio/imelody", "imy");
255 add("audio/midi", "mid");
256 add("audio/midi", "midi");
257 add("audio/midi", "ota");
258 add("audio/midi", "kar");
259 add("audio/midi", "rtttl");
260 add("audio/midi", "xmf");
261 add("audio/mobile-xmf", "mxmf");
262 // add ".mp3" first so it will be the default for guessExtensionFromMimeType
263 add("audio/mpeg", "mp3");
264 add("audio/mpeg", "mpga");
265 add("audio/mpeg", "mpega");
266 add("audio/mpeg", "mp2");
267 add("audio/mp4", "m4a");
268 add("audio/x-m4b", "m4b");
269 add("audio/mpegurl", "m3u");
270 add("audio/ogg", "oga");
271 add("audio/ogg; codecs=opus", "opus"); // opus in ogg container
272 add("audio/opus", "opus"); // audio/opus for containerless opus
273 add("audio/prs.sid", "sid");
274 add("audio/x-aiff", "aif");
275 add("audio/x-aiff", "aiff");
276 add("audio/x-aiff", "aifc");
277 add("audio/x-gsm", "gsm");
278 add("audio/x-matroska", "mka");
279 add("audio/x-mpegurl", "m3u");
280 add("audio/x-ms-wma", "wma");
281 add("audio/x-ms-wax", "wax");
282 add("audio/x-pn-realaudio", "ra");
283 add("audio/x-pn-realaudio", "rm");
284 add("audio/x-pn-realaudio", "ram");
285 add("audio/x-realaudio", "ra");
286 add("audio/x-scpls", "pls");
287 add("audio/x-sd2", "sd2");
288 add("audio/x-wav", "wav");
289 // image/bmp isn't IANA, so image/x-ms-bmp should come first.
290 add("image/x-ms-bmp", "bmp");
291 add("image/bmp", "bmp");
292 add("image/gif", "gif");
293 // image/ico isn't IANA, so image/x-icon should come first.
294 add("image/x-icon", "ico");
295 add("image/ico", "cur");
296 add("image/ico", "ico");
297 add("image/ief", "ief");
298 add("image/heic", "heic");
299 add("image/heif", "heif");
300 add("image/avif", "avif");
301 // add ".jpg" first so it will be the default for guessExtensionFromMimeType
302 add("image/jpeg", "jpg");
303 add("image/jpeg", "jpeg");
304 add("image/jpeg", "jpe");
305 add("image/jpeg", "jfif");
306 add("image/jpeg", "jif");
307 add("image/pcx", "pcx");
308 add("image/png", "png");
309 add("image/svg+xml", "svg");
310 add("image/svg+xml", "svgz");
311 add("image/tiff", "tiff");
312 add("image/tiff", "tif");
313 add("image/vnd.djvu", "djvu");
314 add("image/vnd.djvu", "djv");
315 add("image/vnd.wap.wbmp", "wbmp");
316 add("image/webp", "webp");
317 add("image/x-cmu-raster", "ras");
318 add("image/x-coreldraw", "cdr");
319 add("image/x-coreldrawpattern", "pat");
320 add("image/x-coreldrawtemplate", "cdt");
321 add("image/x-corelphotopaint", "cpt");
322 add("image/x-jg", "art");
323 add("image/x-jng", "jng");
324 add("image/x-photoshop", "psd");
325 add("image/x-portable-anymap", "pnm");
326 add("image/x-portable-bitmap", "pbm");
327 add("image/x-portable-graymap", "pgm");
328 add("image/x-portable-pixmap", "ppm");
329 add("image/x-rgb", "rgb");
330 add("image/x-xbitmap", "xbm");
331 add("image/x-xpixmap", "xpm");
332 add("image/x-xwindowdump", "xwd");
333 add("message/rfc822","eml");
334 add("message/rfc822","mime");
335 add("model/iges", "igs");
336 add("model/iges", "iges");
337 add("model/mesh", "msh");
338 add("model/mesh", "mesh");
339 add("model/mesh", "silo");
340 add("text/calendar", "ics");
341 add("text/calendar", "icz");
342 add("text/comma-separated-values", "csv");
343 add("text/css", "css");
344 add("text/html", "htm");
345 add("text/html", "html");
346 add("text/h323", "323");
347 add("text/iuls", "uls");
348 add("text/javascript", "js");
349 add("text/mathml", "mml");
350 // add ".txt" first so it will be the default for guessExtensionFromMimeType
351 add("text/plain", "txt");
352 add("text/plain", "asc");
353 add("text/plain", "text");
354 add("text/plain", "diff");
355 add("text/plain", "po"); // reserve "pot" for vnd.ms-powerpoint
356 add("text/richtext", "rtx");
357 add("text/rtf", "rtf");
358 add("text/text", "phps");
359 add("text/tab-separated-values", "tsv");
360 add("text/xml", "xml");
361 add("text/x-bibtex", "bib");
362 add("text/x-boo", "boo");
363 add("text/x-c++hdr", "hpp");
364 add("text/x-c++hdr", "h++");
365 add("text/x-c++hdr", "hxx");
366 add("text/x-c++hdr", "hh");
367 add("text/x-c++src", "cpp");
368 add("text/x-c++src", "c++");
369 add("text/x-c++src", "cc");
370 add("text/x-c++src", "cxx");
371 add("text/x-chdr", "h");
372 add("text/x-component", "htc");
373 add("text/x-csh", "csh");
374 add("text/x-csrc", "c");
375 add("text/x-dsrc", "d");
376 add("text/x-haskell", "hs");
377 add("text/x-java", "java");
378 add("text/x-literate-haskell", "lhs");
379 add("text/x-moc", "moc");
380 add("text/x-pascal", "p");
381 add("text/x-pascal", "pas");
382 add("text/x-pcs-gcd", "gcd");
383 add("text/x-setext", "etx");
384 add("text/x-tcl", "tcl");
385 add("text/x-tex", "tex");
386 add("text/x-tex", "ltx");
387 add("text/x-tex", "sty");
388 add("text/x-tex", "cls");
389 add("text/x-vcalendar", "vcs");
390 add("text/x-vcard", "vcf");
391 add("video/avi", "avi");
392 add("video/dl", "dl");
393 add("video/dv", "dif");
394 add("video/dv", "dv");
395 add("video/fli", "fli");
396 add("video/m4v", "m4v");
397 add("video/mp2ts", "ts");
398 add("video/ogg", "ogv");
399 add("video/mpeg", "mpeg");
400 add("video/mpeg", "mpg");
401 add("video/mpeg", "mpe");
402 add("video/mp4", "mp4");
403 add("video/mpeg", "VOB");
404 add("video/quicktime", "qt");
405 add("video/quicktime", "mov");
406 add("video/vnd.mpegurl", "mxu");
407 add("video/webm", "webm");
408 add("video/x-la-asf", "lsf");
409 add("video/x-la-asf", "lsx");
410 add("video/x-matroska", "mkv");
411 add("video/x-mng", "mng");
412 add("video/x-ms-asf", "asf");
413 add("video/x-ms-asf", "asx");
414 add("video/x-ms-wm", "wm");
415 add("video/x-ms-wmv", "wmv");
416 add("video/x-ms-wmx", "wmx");
417 add("video/x-ms-wvx", "wvx");
418 add("video/x-sgi-movie", "movie");
419 add("video/x-webex", "wrf");
420 add("x-conference/x-cooltalk", "ice");
421 add("x-epoc/x-sisx-app", "sisx");
422 applyOverrides();
423 }
424
425 // mime types that are more reliant by path
426 private static final Collection<String> PATH_PRECEDENCE_MIME_TYPE = Arrays.asList("audio/x-m4b");
427
428 private static void add(String mimeType, String extension) {
429 // If we have an existing x -> y mapping, we do not want to
430 // override it with another mapping x -> y2.
431 // If a mime type maps to several extensions
432 // the first extension added is considered the most popular
433 // so we do not want to overwrite it later.
434 if (!mimeTypeToExtensionMap.containsKey(mimeType)) {
435 mimeTypeToExtensionMap.put(mimeType, extension);
436 }
437 if (!extensionToMimeTypeMap.containsKey(extension)) {
438 extensionToMimeTypeMap.put(extension, mimeType);
439 }
440 }
441
442 private static InputStream getContentTypesPropertiesStream() {
443 // User override?
444 String userTable = System.getProperty("content.types.user.table");
445 if (userTable != null) {
446 File f = new File(userTable);
447 if (f.exists()) {
448 try {
449 return new FileInputStream(f);
450 } catch (IOException ignored) {
451 }
452 }
453 }
454 // Standard location?
455 File f = new File(System.getProperty("java.home"), "lib" + File.separator + "content-types.properties");
456 if (f.exists()) {
457 try {
458 return new FileInputStream(f);
459 } catch (IOException ignored) {
460 }
461 }
462 return null;
463 }
464
465 /**
466 * This isn't what the RI does. The RI doesn't have hard-coded defaults, so supplying your
467 * own "content.types.user.table" means you don't get any of the built-ins, and the built-ins
468 * come from "$JAVA_HOME/lib/content-types.properties".
469 */
470 private static void applyOverrides() {
471 // Get the appropriate InputStream to read overrides from, if any.
472 InputStream stream = getContentTypesPropertiesStream();
473 if (stream == null) {
474 return;
475 }
476 try {
477 try {
478 // Read the properties file...
479 Properties overrides = new Properties();
480 overrides.load(stream);
481 // And translate its mapping to ours...
482 for (Map.Entry<Object, Object> entry : overrides.entrySet()) {
483 String extension = (String) entry.getKey();
484 String mimeType = (String) entry.getValue();
485 add(mimeType, extension);
486 }
487 } finally {
488 stream.close();
489 }
490 } catch (IOException ignored) {
491 }
492 }
493
494 private MimeUtils() {
495 }
496
497 /**
498 * Returns true if the given MIME type has an entry in the map.
499 *
500 * @param mimeType A MIME type (i.e. text/plain)
501 * @return True iff there is a mimeType entry in the map.
502 */
503 public static boolean hasMimeType(String mimeType) {
504 if (mimeType == null || mimeType.isEmpty()) {
505 return false;
506 }
507 return mimeTypeToExtensionMap.containsKey(mimeType);
508 }
509
510 /**
511 * Returns the MIME type for the given extension.
512 *
513 * @param extension A file extension without the leading '.'
514 * @return The MIME type for the given extension or null iff there is none.
515 */
516 public static String guessMimeTypeFromExtension(String extension) {
517 if (extension == null || extension.isEmpty()) {
518 return null;
519 }
520 return extensionToMimeTypeMap.get(extension.toLowerCase());
521 }
522
523 /**
524 * Returns true if the given extension has a registered MIME type.
525 *
526 * @param extension A file extension without the leading '.'
527 * @return True iff there is an extension entry in the map.
528 */
529 public static boolean hasExtension(String extension) {
530 if (extension == null || extension.isEmpty()) {
531 return false;
532 }
533 return extensionToMimeTypeMap.containsKey(extension);
534 }
535
536 /**
537 * Returns the registered extension for the given MIME type. Note that some
538 * MIME types map to multiple extensions. This call will return the most
539 * common extension for the given MIME type.
540 *
541 * @param mimeType A MIME type (i.e. text/plain)
542 * @return The extension for the given MIME type or null iff there is none.
543 */
544 public static String guessExtensionFromMimeType(String mimeType) {
545 if (mimeType == null || mimeType.isEmpty()) {
546 return null;
547 }
548 return mimeTypeToExtensionMap.get(mimeType.split(";")[0]);
549 }
550
551 public static String guessMimeTypeFromUriAndMime(final Context context, final Uri uri, final String mime) {
552 Log.d(Config.LOGTAG, "guessMimeTypeFromUriAndMime(" + uri + "," + mime+")");
553 final String mimeFromUri = guessMimeTypeFromUri(context, uri);
554 Log.d(Config.LOGTAG,"mimeFromUri:"+mimeFromUri);
555 if (PATH_PRECEDENCE_MIME_TYPE.contains(mimeFromUri)) {
556 return mimeFromUri;
557 } else if (mime == null || mime.equals("application/octet-stream")) {
558 return mimeFromUri;
559 } else {
560 return mime;
561 }
562 }
563
564 public static String guessMimeTypeFromUri(final Context context, final Uri uri) {
565 if ("data".equals(uri.getScheme())) {
566 String[] parts = uri.getSchemeSpecificPart().split(",", 2);
567 String[] parts2 = parts[0].split(";", 2);
568 if (parts2.length > 0) return parts2[0];
569 }
570 final String mimeTypeContentResolver = guessFromContentResolver(context, uri);
571 final String mimeTypeFromQueryParameter = uri.isHierarchical() ? uri.getQueryParameter("mimeType") : null;
572 final String name = "content".equals(uri.getScheme()) ? getDisplayName(context, uri) : null;
573 final String mimeTypeFromName = Strings.isNullOrEmpty(name) ? null : guessFromPath(name);
574 final String path = uri.getPath();
575 final String mimeTypeFromPath = Strings.isNullOrEmpty(path) ? null : guessFromPath(path);
576 if (PATH_PRECEDENCE_MIME_TYPE.contains(mimeTypeFromName)) {
577 return mimeTypeFromName;
578 }
579 if (PATH_PRECEDENCE_MIME_TYPE.contains(mimeTypeFromPath)) {
580 return mimeTypeFromPath;
581 }
582 if (mimeTypeContentResolver != null && !"application/octet-stream".equals(mimeTypeContentResolver)) {
583 return mimeTypeContentResolver;
584 }
585 if (mimeTypeFromName != null) {
586 return mimeTypeFromName;
587 }
588 if (mimeTypeFromQueryParameter != null) {
589 return mimeTypeFromQueryParameter;
590 }
591 return mimeTypeFromPath;
592 }
593
594 private static String guessFromContentResolver(final Context context, final Uri uri) {
595 try {
596 return context.getContentResolver().getType(uri);
597 } catch (final Throwable e) {
598 return null;
599 }
600 }
601
602 private static String getDisplayName(final Context context, final Uri uri) {
603 try (final Cursor cursor = context.getContentResolver().query(uri, null, null, null, null)) {
604 if (cursor != null && cursor.moveToFirst()) {
605 final int index = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
606 if (index == -1) {
607 return null;
608 }
609 return cursor.getString(index);
610 }
611 } catch (final Exception e) {
612 return null;
613 }
614 return null;
615 }
616
617 public static String guessFromPath(final String path) {
618 final int start = path.lastIndexOf('.') + 1;
619 if (start < path.length()) {
620 return MimeUtils.guessMimeTypeFromExtension(path.substring(start));
621 }
622 return null;
623 }
624
625 public static String extractRelevantExtension(final String path) {
626 return extractRelevantExtension(path, false);
627 }
628
629 public static String extractRelevantExtension(final String path, final boolean ignoreCryptoExtension) {
630 if (Strings.isNullOrEmpty(path)) {
631 return null;
632 }
633
634 final String filenameQueryAnchor = path.substring(path.lastIndexOf('/') + 1);
635 final String filenameQuery = cutBefore(filenameQueryAnchor, '#');
636 final String filename = cutBefore(filenameQuery, '?');
637 final int dotPosition = filename.lastIndexOf('.');
638
639 if (dotPosition == -1) {
640 return null;
641 }
642 final String extension = filename.substring(dotPosition + 1);
643 // we want the real file extension, not the crypto one
644 if (ignoreCryptoExtension && Transferable.VALID_CRYPTO_EXTENSIONS.contains(extension)) {
645 return extractRelevantExtension(filename.substring(0, dotPosition));
646 } else {
647 return extension;
648 }
649 }
650
651 private static String cutBefore(final String input, final char c) {
652 final int position = input.indexOf(c);
653 if (position > 0) {
654 return input.substring(0, position);
655 } else {
656 return input;
657 }
658 }
659}