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fix(android): Respect "filename*" parameter in the field Content-Disp…
…osition when detecting filenames for downloading. (react-native-webview#2767)
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android/src/main/java/com/reactnativecommunity/webview/URLUtil.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,179 @@ | ||
| /* | ||
| * Copyright (C) 2006 The Android Open Source Project | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| /* | ||
| * The source code is obtained from the Android SDK Sources (API level 31), | ||
| * and modified by UNIDY2002 <UNIDY2002@outlook.com>. | ||
| * | ||
| * Change list: | ||
| * - Remove all unused class members except guessFileName, | ||
| * CONTENT_DISPOSITION_PATTERN and parseContentDisposition | ||
| * - Improve CONTENT_DISPOSITION_PATTERN and parseContentDisposition to add | ||
| * support for the "filename*" parameter in content disposition | ||
| */ | ||
|
|
||
| package com.reactnativecommunity.webview; | ||
|
|
||
| import android.net.Uri; | ||
| import android.webkit.MimeTypeMap; | ||
| import androidx.annotation.Nullable; | ||
|
|
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| import java.io.UnsupportedEncodingException; | ||
| import java.net.URLDecoder; | ||
| import java.util.Locale; | ||
| import java.util.regex.Matcher; | ||
| import java.util.regex.Pattern; | ||
|
|
||
| public final class URLUtil { | ||
| /** | ||
| * Guesses canonical filename that a download would have, using | ||
| * the URL and contentDisposition. File extension, if not defined, | ||
| * is added based on the mimetype | ||
| * @param url Url to the content | ||
| * @param contentDisposition Content-Disposition HTTP header or {@code null} | ||
| * @param mimeType Mime-type of the content or {@code null} | ||
| * | ||
| * @return suggested filename | ||
| */ | ||
| public static final String guessFileName( | ||
| String url, | ||
| @Nullable String contentDisposition, | ||
| @Nullable String mimeType) { | ||
| String filename = null; | ||
| String extension = null; | ||
|
|
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| // If we couldn't do anything with the hint, move toward the content disposition | ||
| if (filename == null && contentDisposition != null) { | ||
| filename = parseContentDisposition(contentDisposition); | ||
| if (filename != null) { | ||
| int index = filename.lastIndexOf('/') + 1; | ||
| if (index > 0) { | ||
| filename = filename.substring(index); | ||
| } | ||
| } | ||
| } | ||
|
|
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| // If all the other http-related approaches failed, use the plain uri | ||
| if (filename == null) { | ||
| String decodedUrl = Uri.decode(url); | ||
| if (decodedUrl != null) { | ||
| int queryIndex = decodedUrl.indexOf('?'); | ||
| // If there is a query string strip it, same as desktop browsers | ||
| if (queryIndex > 0) { | ||
| decodedUrl = decodedUrl.substring(0, queryIndex); | ||
| } | ||
| if (!decodedUrl.endsWith("/")) { | ||
| int index = decodedUrl.lastIndexOf('/') + 1; | ||
| if (index > 0) { | ||
| filename = decodedUrl.substring(index); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| // Finally, if couldn't get filename from URI, get a generic filename | ||
| if (filename == null) { | ||
| filename = "downloadfile"; | ||
| } | ||
|
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| // Split filename between base and extension | ||
| // Add an extension if filename does not have one | ||
| int dotIndex = filename.indexOf('.'); | ||
| if (dotIndex < 0) { | ||
| if (mimeType != null) { | ||
| extension = MimeTypeMap.getSingleton().getExtensionFromMimeType(mimeType); | ||
| if (extension != null) { | ||
| extension = "." + extension; | ||
| } | ||
| } | ||
| if (extension == null) { | ||
| if (mimeType != null && mimeType.toLowerCase(Locale.ROOT).startsWith("text/")) { | ||
| if (mimeType.equalsIgnoreCase("text/html")) { | ||
| extension = ".html"; | ||
| } else { | ||
| extension = ".txt"; | ||
| } | ||
| } else { | ||
| extension = ".bin"; | ||
| } | ||
| } | ||
| } else { | ||
| if (mimeType != null) { | ||
| // Compare the last segment of the extension against the mime type. | ||
| // If there's a mismatch, discard the entire extension. | ||
| int lastDotIndex = filename.lastIndexOf('.'); | ||
| String typeFromExt = MimeTypeMap.getSingleton().getMimeTypeFromExtension( | ||
| filename.substring(lastDotIndex + 1)); | ||
| if (typeFromExt != null && !typeFromExt.equalsIgnoreCase(mimeType)) { | ||
| extension = MimeTypeMap.getSingleton().getExtensionFromMimeType(mimeType); | ||
| if (extension != null) { | ||
| extension = "." + extension; | ||
| } | ||
| } | ||
| } | ||
| if (extension == null) { | ||
| extension = filename.substring(dotIndex); | ||
| } | ||
| filename = filename.substring(0, dotIndex); | ||
| } | ||
|
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| return filename + extension; | ||
| } | ||
|
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| /** Regex used to parse content-disposition headers */ | ||
| private static final Pattern CONTENT_DISPOSITION_PATTERN = | ||
| Pattern.compile("attachment(?:;\\s*filename\\s*=\\s*(\"?)([^\"]*)\\1)?(?:;\\s*filename\\s*\\*\\s*=\\s*([^']*)'[^']*'([^']*))?\\s*$", | ||
| Pattern.CASE_INSENSITIVE); | ||
|
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| /** | ||
| * Parse the Content-Disposition HTTP Header. The format of the header | ||
| * is defined here: <a href="https://www.rfc-editor.org/rfc/rfc6266">RFC 6266</a> | ||
| * This header provides a filename for content that is going to be | ||
| * downloaded to the file system. We only support the attachment type. | ||
| */ | ||
| static String parseContentDisposition(String contentDisposition) { | ||
| try { | ||
| // The regex attempts to match the following pattern: | ||
| // attachment; filename="(Group 2)"; filename*=(Group 3)'(lang)'(Group 4) | ||
| // Group 4 refers to the percent-encoded filename, and the charset | ||
| // is specified in Group 3. | ||
| // Group 2 is the fallback filename. | ||
| // Group 1 refers to the quotation marks around Group 2. | ||
| // | ||
| // Test cases can be found at http://test.greenbytes.de/tech/tc2231/ | ||
| // Examples can be found at https://www.rfc-editor.org/rfc/rfc6266#section-5 | ||
| // There are a few known limitations: | ||
| // - any Content Disposition value that does not have parameters | ||
| // arranged in the order of "attachment...filename...filename*" | ||
| // or contains extra parameters shall fail to be parsed | ||
| // - any filename that contains " shall fail to be parsed | ||
| Matcher m = CONTENT_DISPOSITION_PATTERN.matcher(contentDisposition); | ||
| if (m.find()) { | ||
| if (m.group(3) != null && m.group(4) != null) { | ||
| try { | ||
| return URLDecoder.decode(m.group(4), m.group(3).isEmpty() ? "UTF-8" : m.group(3)); | ||
| } catch (UnsupportedEncodingException e) { | ||
| // Skip the ext-parameter as the encoding is unsupported | ||
| } | ||
| } | ||
| return m.group(2); | ||
| } | ||
| } catch (IllegalStateException ex) { | ||
| // This function is defined as returning null when it can't parse the header | ||
| } | ||
| return null; | ||
| } | ||
| } |
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