| /* |
| * 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. |
| */ |
| |
| package android.webkit; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import android.net.Uri; |
| import android.net.ParseException; |
| import android.net.WebAddress; |
| import android.util.Log; |
| |
| public final class URLUtil { |
| |
| private static final String LOGTAG = "webkit"; |
| |
| // to refer to bar.png under your package's asset/foo/ directory, use |
| // "file:///android_asset/foo/bar.png". |
| static final String ASSET_BASE = "file:///android_asset/"; |
| // to refer to bar.png under your package's res/drawable/ directory, use |
| // "file:///android_res/drawable/bar.png". Use "drawable" to refer to |
| // "drawable-hdpi" directory as well. |
| static final String RESOURCE_BASE = "file:///android_res/"; |
| static final String FILE_BASE = "file://"; |
| static final String PROXY_BASE = "file:///cookieless_proxy/"; |
| |
| /** |
| * Cleans up (if possible) user-entered web addresses |
| */ |
| public static String guessUrl(String inUrl) { |
| |
| String retVal = inUrl; |
| WebAddress webAddress; |
| |
| if (DebugFlags.URL_UTIL) Log.v(LOGTAG, "guessURL before queueRequest: " + inUrl); |
| |
| if (inUrl.length() == 0) return inUrl; |
| if (inUrl.startsWith("about:")) return inUrl; |
| // Do not try to interpret data scheme URLs |
| if (inUrl.startsWith("data:")) return inUrl; |
| // Do not try to interpret file scheme URLs |
| if (inUrl.startsWith("file:")) return inUrl; |
| // Do not try to interpret javascript scheme URLs |
| if (inUrl.startsWith("javascript:")) return inUrl; |
| |
| // bug 762454: strip period off end of url |
| if (inUrl.endsWith(".") == true) { |
| inUrl = inUrl.substring(0, inUrl.length() - 1); |
| } |
| |
| try { |
| webAddress = new WebAddress(inUrl); |
| } catch (ParseException ex) { |
| |
| if (DebugFlags.URL_UTIL) { |
| Log.v(LOGTAG, "smartUrlFilter: failed to parse url = " + inUrl); |
| } |
| return retVal; |
| } |
| |
| // Check host |
| if (webAddress.getHost().indexOf('.') == -1) { |
| // no dot: user probably entered a bare domain. try .com |
| webAddress.setHost("www." + webAddress.getHost() + ".com"); |
| } |
| return webAddress.toString(); |
| } |
| |
| public static String composeSearchUrl(String inQuery, String template, |
| String queryPlaceHolder) { |
| int placeHolderIndex = template.indexOf(queryPlaceHolder); |
| if (placeHolderIndex < 0) { |
| return null; |
| } |
| |
| String query; |
| StringBuilder buffer = new StringBuilder(); |
| buffer.append(template.substring(0, placeHolderIndex)); |
| |
| try { |
| query = java.net.URLEncoder.encode(inQuery, "utf-8"); |
| buffer.append(query); |
| } catch (UnsupportedEncodingException ex) { |
| return null; |
| } |
| |
| buffer.append(template.substring( |
| placeHolderIndex + queryPlaceHolder.length())); |
| |
| return buffer.toString(); |
| } |
| |
| public static byte[] decode(byte[] url) throws IllegalArgumentException { |
| if (url.length == 0) { |
| return new byte[0]; |
| } |
| |
| // Create a new byte array with the same length to ensure capacity |
| byte[] tempData = new byte[url.length]; |
| |
| int tempCount = 0; |
| for (int i = 0; i < url.length; i++) { |
| byte b = url[i]; |
| if (b == '%') { |
| if (url.length - i > 2) { |
| b = (byte) (parseHex(url[i + 1]) * 16 |
| + parseHex(url[i + 2])); |
| i += 2; |
| } else { |
| throw new IllegalArgumentException("Invalid format"); |
| } |
| } |
| tempData[tempCount++] = b; |
| } |
| byte[] retData = new byte[tempCount]; |
| System.arraycopy(tempData, 0, retData, 0, tempCount); |
| return retData; |
| } |
| |
| /** |
| * @return True iff the url is correctly URL encoded |
| */ |
| static boolean verifyURLEncoding(String url) { |
| int count = url.length(); |
| if (count == 0) { |
| return false; |
| } |
| |
| int index = url.indexOf('%'); |
| while (index >= 0 && index < count) { |
| if (index < count - 2) { |
| try { |
| parseHex((byte) url.charAt(++index)); |
| parseHex((byte) url.charAt(++index)); |
| } catch (IllegalArgumentException e) { |
| return false; |
| } |
| } else { |
| return false; |
| } |
| index = url.indexOf('%', index + 1); |
| } |
| return true; |
| } |
| |
| private static int parseHex(byte b) { |
| if (b >= '0' && b <= '9') return (b - '0'); |
| if (b >= 'A' && b <= 'F') return (b - 'A' + 10); |
| if (b >= 'a' && b <= 'f') return (b - 'a' + 10); |
| |
| throw new IllegalArgumentException("Invalid hex char '" + b + "'"); |
| } |
| |
| /** |
| * @return True iff the url is an asset file. |
| */ |
| public static boolean isAssetUrl(String url) { |
| return (null != url) && url.startsWith(ASSET_BASE); |
| } |
| |
| /** |
| * @return True iff the url is a resource file. |
| * @hide |
| */ |
| public static boolean isResourceUrl(String url) { |
| return (null != url) && url.startsWith(RESOURCE_BASE); |
| } |
| |
| /** |
| * @return True iff the url is a proxy url to allow cookieless network |
| * requests from a file url. |
| * @deprecated Cookieless proxy is no longer supported. |
| */ |
| @Deprecated |
| public static boolean isCookielessProxyUrl(String url) { |
| return (null != url) && url.startsWith(PROXY_BASE); |
| } |
| |
| /** |
| * @return True iff the url is a local file. |
| */ |
| public static boolean isFileUrl(String url) { |
| return (null != url) && (url.startsWith(FILE_BASE) && |
| !url.startsWith(ASSET_BASE) && |
| !url.startsWith(PROXY_BASE)); |
| } |
| |
| /** |
| * @return True iff the url is an about: url. |
| */ |
| public static boolean isAboutUrl(String url) { |
| return (null != url) && url.startsWith("about:"); |
| } |
| |
| /** |
| * @return True iff the url is a data: url. |
| */ |
| public static boolean isDataUrl(String url) { |
| return (null != url) && url.startsWith("data:"); |
| } |
| |
| /** |
| * @return True iff the url is a javascript: url. |
| */ |
| public static boolean isJavaScriptUrl(String url) { |
| return (null != url) && url.startsWith("javascript:"); |
| } |
| |
| /** |
| * @return True iff the url is an http: url. |
| */ |
| public static boolean isHttpUrl(String url) { |
| return (null != url) && |
| (url.length() > 6) && |
| url.substring(0, 7).equalsIgnoreCase("http://"); |
| } |
| |
| /** |
| * @return True iff the url is an https: url. |
| */ |
| public static boolean isHttpsUrl(String url) { |
| return (null != url) && |
| (url.length() > 7) && |
| url.substring(0, 8).equalsIgnoreCase("https://"); |
| } |
| |
| /** |
| * @return True iff the url is a network url. |
| */ |
| public static boolean isNetworkUrl(String url) { |
| if (url == null || url.length() == 0) { |
| return false; |
| } |
| return isHttpUrl(url) || isHttpsUrl(url); |
| } |
| |
| /** |
| * @return True iff the url is a content: url. |
| */ |
| public static boolean isContentUrl(String url) { |
| return (null != url) && url.startsWith("content:"); |
| } |
| |
| /** |
| * @return True iff the url is valid. |
| */ |
| public static boolean isValidUrl(String url) { |
| if (url == null || url.length() == 0) { |
| return false; |
| } |
| |
| return (isAssetUrl(url) || |
| isResourceUrl(url) || |
| isFileUrl(url) || |
| isAboutUrl(url) || |
| isHttpUrl(url) || |
| isHttpsUrl(url) || |
| isJavaScriptUrl(url) || |
| isContentUrl(url)); |
| } |
| |
| /** |
| * Strips the url of the anchor. |
| */ |
| public static String stripAnchor(String url) { |
| int anchorIndex = url.indexOf('#'); |
| if (anchorIndex != -1) { |
| return url.substring(0, anchorIndex); |
| } |
| return url; |
| } |
| |
| /** |
| * 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 null |
| * @param mimeType Mime-type of the content or null |
| * |
| * @return suggested filename |
| */ |
| public static final String guessFileName( |
| String url, |
| String contentDisposition, |
| String mimeType) { |
| String filename = null; |
| String extension = null; |
| |
| // 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); |
| } |
| } |
| } |
| |
| // 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); |
| } |
| } |
| } |
| } |
| |
| // Finally, if couldn't get filename from URI, get a generic filename |
| if (filename == null) { |
| filename = "downloadfile"; |
| } |
| |
| // 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().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); |
| } |
| |
| return filename + extension; |
| } |
| |
| /** Regex used to parse content-disposition headers */ |
| private static final Pattern CONTENT_DISPOSITION_PATTERN = |
| Pattern.compile("attachment;\\s*filename\\s*=\\s*(\"?)([^\"]*)\\1\\s*$", |
| Pattern.CASE_INSENSITIVE); |
| |
| /* |
| * Parse the Content-Disposition HTTP Header. The format of the header |
| * is defined here: http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html |
| * This header provides a filename for content that is going to be |
| * downloaded to the file system. We only support the attachment type. |
| * Note that RFC 2616 specifies the filename value must be double-quoted. |
| * Unfortunately some servers do not quote the value so to maintain |
| * consistent behaviour with other browsers, we allow unquoted values too. |
| */ |
| static String parseContentDisposition(String contentDisposition) { |
| try { |
| Matcher m = CONTENT_DISPOSITION_PATTERN.matcher(contentDisposition); |
| if (m.find()) { |
| return m.group(2); |
| } |
| } catch (IllegalStateException ex) { |
| // This function is defined as returning null when it can't parse the header |
| } |
| return null; |
| } |
| } |