/*
* 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.Locale;
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";
private static final boolean TRACE = false;
// 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/";
static final String CONTENT_BASE = "content:";
/**
* Cleans up (if possible) user-entered web addresses
*/
public static String guessUrl(String inUrl) {
String retVal = inUrl;
WebAddress webAddress;
if (TRACE) 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 (TRACE) {
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_BASE);
}
/**
* @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(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);
}
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;
}
}
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