The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 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 | |
| 17 | package android.webkit; |
| 18 | |
Elliott Hughes | 0f116961 | 2010-08-02 13:37:48 -0700 | [diff] [blame] | 19 | import android.text.TextUtils; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 20 | import java.util.regex.Pattern; |
Elliott Hughes | 0f116961 | 2010-08-02 13:37:48 -0700 | [diff] [blame] | 21 | import libcore.net.MimeUtils; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 22 | |
| 23 | /** |
| 24 | * Two-way map that maps MIME-types to file extensions and vice versa. |
Elliott Hughes | 0f116961 | 2010-08-02 13:37:48 -0700 | [diff] [blame] | 25 | * |
| 26 | * <p>See also {@link java.net.URLConnection#guessContentTypeFromName} |
| 27 | * and {@link java.net.URLConnection#guessContentTypeFromStream}. This |
| 28 | * class and {@code URLConnection} share the same MIME-type database. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 29 | */ |
Patrick Scott | 9f61732 | 2009-07-21 13:39:45 -0400 | [diff] [blame] | 30 | public class MimeTypeMap { |
Elliott Hughes | 0f116961 | 2010-08-02 13:37:48 -0700 | [diff] [blame] | 31 | private static final MimeTypeMap sMimeTypeMap = new MimeTypeMap(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 32 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 33 | private MimeTypeMap() { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 34 | } |
| 35 | |
| 36 | /** |
| 37 | * Returns the file extension or an empty string iff there is no |
Patrick Scott | 9f61732 | 2009-07-21 13:39:45 -0400 | [diff] [blame] | 38 | * extension. This method is a convenience method for obtaining the |
| 39 | * extension of a url and has undefined results for other Strings. |
| 40 | * @param url |
| 41 | * @return The file extension of the given url. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 42 | */ |
| 43 | public static String getFileExtensionFromUrl(String url) { |
Elliott Hughes | 0f116961 | 2010-08-02 13:37:48 -0700 | [diff] [blame] | 44 | if (!TextUtils.isEmpty(url)) { |
Ben Murdoch | 1870015 | 2010-12-14 16:36:03 +0000 | [diff] [blame] | 45 | int fragment = url.lastIndexOf('#'); |
| 46 | if (fragment > 0) { |
| 47 | url = url.substring(0, fragment); |
| 48 | } |
| 49 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 50 | int query = url.lastIndexOf('?'); |
| 51 | if (query > 0) { |
| 52 | url = url.substring(0, query); |
| 53 | } |
Ben Murdoch | 1870015 | 2010-12-14 16:36:03 +0000 | [diff] [blame] | 54 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 55 | int filenamePos = url.lastIndexOf('/'); |
| 56 | String filename = |
| 57 | 0 <= filenamePos ? url.substring(filenamePos + 1) : url; |
| 58 | |
| 59 | // if the filename contains special characters, we don't |
| 60 | // consider it valid for our matching purposes: |
Elliott Hughes | 0f116961 | 2010-08-02 13:37:48 -0700 | [diff] [blame] | 61 | if (!filename.isEmpty() && |
Melanie Clements | f19670a | 2010-05-01 22:48:20 -0400 | [diff] [blame] | 62 | Pattern.matches("[a-zA-Z_0-9\\.\\-\\(\\)\\%]+", filename)) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 63 | int dotPos = filename.lastIndexOf('.'); |
| 64 | if (0 <= dotPos) { |
| 65 | return filename.substring(dotPos + 1); |
| 66 | } |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | return ""; |
| 71 | } |
| 72 | |
| 73 | /** |
Patrick Scott | 9f61732 | 2009-07-21 13:39:45 -0400 | [diff] [blame] | 74 | * Return true if the given MIME type has an entry in the map. |
| 75 | * @param mimeType A MIME type (i.e. text/plain) |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 76 | * @return True iff there is a mimeType entry in the map. |
| 77 | */ |
| 78 | public boolean hasMimeType(String mimeType) { |
Elliott Hughes | 0f116961 | 2010-08-02 13:37:48 -0700 | [diff] [blame] | 79 | return MimeUtils.hasMimeType(mimeType); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | /** |
Patrick Scott | 9f61732 | 2009-07-21 13:39:45 -0400 | [diff] [blame] | 83 | * Return the MIME type for the given extension. |
| 84 | * @param extension A file extension without the leading '.' |
| 85 | * @return The MIME type for the given extension or null iff there is none. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 86 | */ |
| 87 | public String getMimeTypeFromExtension(String extension) { |
Elliott Hughes | 0f116961 | 2010-08-02 13:37:48 -0700 | [diff] [blame] | 88 | return MimeUtils.guessMimeTypeFromExtension(extension); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 89 | } |
| 90 | |
Patrick Scott | 021b7b4 | 2010-01-13 14:12:43 -0500 | [diff] [blame] | 91 | // Static method called by jni. |
| 92 | private static String mimeTypeFromExtension(String extension) { |
Elliott Hughes | 0f116961 | 2010-08-02 13:37:48 -0700 | [diff] [blame] | 93 | return MimeUtils.guessMimeTypeFromExtension(extension); |
Patrick Scott | 021b7b4 | 2010-01-13 14:12:43 -0500 | [diff] [blame] | 94 | } |
| 95 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 96 | /** |
Patrick Scott | 9f61732 | 2009-07-21 13:39:45 -0400 | [diff] [blame] | 97 | * Return true if the given extension has a registered MIME type. |
| 98 | * @param extension A file extension without the leading '.' |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 99 | * @return True iff there is an extension entry in the map. |
| 100 | */ |
| 101 | public boolean hasExtension(String extension) { |
Elliott Hughes | 0f116961 | 2010-08-02 13:37:48 -0700 | [diff] [blame] | 102 | return MimeUtils.hasExtension(extension); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | /** |
Patrick Scott | 9f61732 | 2009-07-21 13:39:45 -0400 | [diff] [blame] | 106 | * Return the registered extension for the given MIME type. Note that some |
| 107 | * MIME types map to multiple extensions. This call will return the most |
| 108 | * common extension for the given MIME type. |
| 109 | * @param mimeType A MIME type (i.e. text/plain) |
| 110 | * @return The extension for the given MIME type or null iff there is none. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 111 | */ |
| 112 | public String getExtensionFromMimeType(String mimeType) { |
Elliott Hughes | 0f116961 | 2010-08-02 13:37:48 -0700 | [diff] [blame] | 113 | return MimeUtils.guessExtensionFromMimeType(mimeType); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | /** |
Iain Merrick | d77f9b7 | 2010-10-18 18:22:25 +0100 | [diff] [blame] | 117 | * If the given MIME type is null, or one of the "generic" types (text/plain |
| 118 | * or application/octet-stream) map it to a type that Android can deal with. |
| 119 | * If the given type is not generic, return it unchanged. |
| 120 | * |
| 121 | * @param mimeType MIME type provided by the server. |
| 122 | * @param url URL of the data being loaded. |
| 123 | * @param contentDisposition Content-disposition header given by the server. |
| 124 | * @return The MIME type that should be used for this data. |
| 125 | */ |
| 126 | /* package */ String remapGenericMimeType(String mimeType, String url, |
| 127 | String contentDisposition) { |
| 128 | // If we have one of "generic" MIME types, try to deduce |
| 129 | // the right MIME type from the file extension (if any): |
| 130 | if ("text/plain".equals(mimeType) || |
| 131 | "application/octet-stream".equals(mimeType)) { |
| 132 | |
| 133 | // for attachment, use the filename in the Content-Disposition |
| 134 | // to guess the mimetype |
| 135 | String filename = null; |
| 136 | if (contentDisposition != null) { |
| 137 | filename = URLUtil.parseContentDisposition(contentDisposition); |
| 138 | } |
| 139 | if (filename != null) { |
| 140 | url = filename; |
| 141 | } |
| 142 | String extension = getFileExtensionFromUrl(url); |
| 143 | String newMimeType = getMimeTypeFromExtension(extension); |
| 144 | if (newMimeType != null) { |
| 145 | mimeType = newMimeType; |
| 146 | } |
| 147 | } else if ("text/vnd.wap.wml".equals(mimeType)) { |
| 148 | // As we don't support wml, render it as plain text |
| 149 | mimeType = "text/plain"; |
| 150 | } else { |
| 151 | // It seems that xhtml+xml and vnd.wap.xhtml+xml mime |
| 152 | // subtypes are used interchangeably. So treat them the same. |
| 153 | if ("application/vnd.wap.xhtml+xml".equals(mimeType)) { |
| 154 | mimeType = "application/xhtml+xml"; |
| 155 | } |
| 156 | } |
| 157 | return mimeType; |
| 158 | } |
| 159 | |
| 160 | /** |
Patrick Scott | 9f61732 | 2009-07-21 13:39:45 -0400 | [diff] [blame] | 161 | * Get the singleton instance of MimeTypeMap. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 162 | * @return The singleton instance of the MIME-type map. |
| 163 | */ |
| 164 | public static MimeTypeMap getSingleton() { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 165 | return sMimeTypeMap; |
| 166 | } |
| 167 | } |