/*
* $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/util/URIUtil.java,v 1.21 2003/06/29 21:34:06 olegk Exp $
* $Revision: 1.21 $
* $Date: 2003/06/29 21:34:06 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* ====================================================================
*
* This software consists of voluntary contributions made by many
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* information on the Apache Software Foundation, please see
* .
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.commons.httpclient.util;
import java.io.UnsupportedEncodingException;
import java.util.BitSet;
import org.apache.commons.httpclient.URI;
import org.apache.commons.httpclient.URIException;
/**
* The URI escape and character encoding and decoding utility.
* It's compatible with {@link org.apache.commons.httpclient.HttpURL} rather
* than {@link org.apache.commons.httpclient.URI}.
*
* @author Sung-Gu
* @version $Revision: 1.21 $ $Date: 2002/03/14 15:14:01
*/
public class URIUtil {
// ----------------------------------------------------- Instance variables
protected static final BitSet empty = new BitSet(1);
// ---------------------------------------------------------- URI utilities
/**
* Get the basename of an URI. It's possibly an empty string.
*
* @param uri a string regarded an URI
* @return the basename string; an empty string if the path ends with slash
*/
public static String getName(String uri) {
if (uri == null || uri.length() == 0) { return uri; }
String path = URIUtil.getPath(uri);
int at = path.lastIndexOf("/");
int to = path.length();
return (at >= 0) ? path.substring(at + 1, to) : path;
}
/**
* Get the query of an URI.
*
* @param uri a string regarded an URI
* @return the query string; null if empty or undefined
*/
public static String getQuery(String uri) {
if (uri == null || uri.length() == 0) { return null; }
// consider of net_path
int at = uri.indexOf("//");
int from = uri.indexOf(
"/",
at >= 0 ? (uri.lastIndexOf("/", at - 1) >= 0 ? 0 : at + 2) : 0
);
// the authority part of URI ignored
int to = uri.length();
// reuse the at and from variables to consider the query
at = uri.indexOf("?", from);
if (at >= 0) {
from = at + 1;
} else {
return null;
}
// check the fragment
if (uri.lastIndexOf("#") > from) {
to = uri.lastIndexOf("#");
}
// get the path and query.
return (from < 0 || from == to) ? null : uri.substring(from, to);
}
/**
* Get the path of an URI.
*
* @param uri a string regarded an URI
* @return the path string
*/
public static String getPath(String uri) {
if (uri == null) {
return null;
}
// consider of net_path
int at = uri.indexOf("//");
int from = uri.indexOf(
"/",
at >= 0 ? (uri.lastIndexOf("/", at - 1) >= 0 ? 0 : at + 2) : 0
);
// the authority part of URI ignored
int to = uri.length();
// check the query
if (uri.indexOf('?', from) != -1) {
to = uri.indexOf('?', from);
}
// check the fragment
if (uri.lastIndexOf("#") > from && uri.lastIndexOf("#") < to) {
to = uri.lastIndexOf("#");
}
// get only the path.
return (from < 0) ? (at >= 0 ? "/" : uri) : uri.substring(from, to);
}
/**
* Get the path and query of an URI.
*
* @param uri a string regarded an URI
* @return the path and query string
*/
public static String getPathQuery(String uri) {
if (uri == null) {
return null;
}
// consider of net_path
int at = uri.indexOf("//");
int from = uri.indexOf(
"/",
at >= 0 ? (uri.lastIndexOf("/", at - 1) >= 0 ? 0 : at + 2) : 0
);
// the authority part of URI ignored
int to = uri.length();
// Ignore the '?' mark so to ignore the query.
// check the fragment
if (uri.lastIndexOf("#") > from) {
to = uri.lastIndexOf("#");
}
// get the path and query.
return (from < 0) ? (at >= 0 ? "/" : uri) : uri.substring(from, to);
}
/**
* Get the path of an URI and its rest part.
*
* @param uri a string regarded an URI
* @return the string from the path part
*/
public static String getFromPath(String uri) {
if (uri == null) {
return null;
}
// consider of net_path
int at = uri.indexOf("//");
int from = uri.indexOf(
"/",
at >= 0 ? (uri.lastIndexOf("/", at - 1) >= 0 ? 0 : at + 2) : 0
);
// get the path and its rest.
return (from < 0) ? (at >= 0 ? "/" : uri) : uri.substring(from);
}
// ----------------------------------------------------- Encoding utilities
/**
* Get the all escaped and encoded string with the default protocl charset.
* It's the same function to use encode(String unescaped, Bitset
* empty, URI.getDefaultProtocolCharset()).
*
* @param unescaped an unescaped string
* @return the escaped string
*
* @throws URIException if the default protocol charset is not supported
*
* @see URI#getDefaultProtocolCharset
* @see #encode
*/
public static String encodeAll(String unescaped) throws URIException {
return encodeAll(unescaped, URI.getDefaultProtocolCharset());
}
/**
* Get the all escaped and encoded string with a given charset.
* It's the same function to use encode(String unescaped, Bitset
* empty, String charset).
*
* @param unescaped an unescaped string
* @param charset the charset
* @return the escaped string
*
* @throws URIException if the charset is not supported
*
* @see #encode
*/
public static String encodeAll(String unescaped, String charset)
throws URIException {
return encode(unescaped, empty, charset);
}
/**
* Escape and encode a string regarded as within the authority component of
* an URI with the default protocol charset.
* Within the authority component, the characters ";", ":", "@", "?", and
* "/" are reserved.
*
* @param unescaped an unescaped string
* @return the escaped string
*
* @throws URIException if the default protocol charset is not supported
*
* @see URI#getDefaultProtocolCharset
* @see #encode
*/
public static String encodeWithinAuthority(String unescaped)
throws URIException {
return encodeWithinAuthority(unescaped, URI.getDefaultProtocolCharset());
}
/**
* Escape and encode a string regarded as within the authority component of
* an URI with a given charset.
* Within the authority component, the characters ";", ":", "@", "?", and
* "/" are reserved.
*
* @param unescaped an unescaped string
* @param charset the charset
* @return the escaped string
*
* @throws URIException if the charset is not supported
*
* @see #encode
*/
public static String encodeWithinAuthority(String unescaped, String charset)
throws URIException {
return encode(unescaped, URI.allowed_within_authority, charset);
}
/**
* Escape and encode a string regarded as the path and query components of
* an URI with the default protocol charset.
*
* @param unescaped an unescaped string
* @return the escaped string
*
* @throws URIException if the default protocol charset is not supported
*
* @see URI#getDefaultProtocolCharset
* @see #encode
*/
public static String encodePathQuery(String unescaped) throws URIException {
return encodePathQuery(unescaped, URI.getDefaultProtocolCharset());
}
/**
* Escape and encode a string regarded as the path and query components of
* an URI with a given charset.
*
* @param unescaped an unescaped string
* @param charset the charset
* @return the escaped string
*
* @throws URIException if the charset is not supported
*
* @see #encode
*/
public static String encodePathQuery(String unescaped, String charset)
throws URIException {
int at = unescaped.indexOf('?');
if (at < 0) {
return encode(unescaped, URI.allowed_abs_path, charset);
}
// else
return encode(unescaped.substring(0, at), URI.allowed_abs_path, charset)
+ '?' + encode(unescaped.substring(at + 1), URI.allowed_query, charset);
}
/**
* Escape and encode a string regarded as within the path component of an
* URI with the default protocol charset.
* The path may consist of a sequence of path segments separated by a
* single slash "/" character. Within a path segment, the characters
* "/", ";", "=", and "?" are reserved.
*
* @param unescaped an unescaped string
* @return the escaped string
*
* @throws URIException if the default protocol charset is not supported
*
* @see URI#getDefaultProtocolCharset
* @see #encode
*/
public static String encodeWithinPath(String unescaped)
throws URIException {
return encodeWithinPath(unescaped, URI.getDefaultProtocolCharset());
}
/**
* Escape and encode a string regarded as within the path component of an
* URI with a given charset.
* The path may consist of a sequence of path segments separated by a
* single slash "/" character. Within a path segment, the characters
* "/", ";", "=", and "?" are reserved.
*
* @param unescaped an unescaped string
* @param charset the charset
* @return the escaped string
*
* @throws URIException if the charset is not supported
*
* @see #encode
*/
public static String encodeWithinPath(String unescaped, String charset)
throws URIException {
return encode(unescaped, URI.allowed_within_path, charset);
}
/**
* Escape and encode a string regarded as the path component of an URI with
* the default protocol charset.
*
* @param unescaped an unescaped string
* @return the escaped string
*
* @throws URIException if the default protocol charset is not supported
*
* @see URI#getDefaultProtocolCharset
* @see #encode
*/
public static String encodePath(String unescaped) throws URIException {
return encodePath(unescaped, URI.getDefaultProtocolCharset());
}
/**
* Escape and encode a string regarded as the path component of an URI with
* a given charset.
*
* @param unescaped an unescaped string
* @param charset the charset
* @return the escaped string
*
* @throws URIException if the charset is not supported
*
* @see #encode
*/
public static String encodePath(String unescaped, String charset)
throws URIException {
return encode(unescaped, URI.allowed_abs_path, charset);
}
/**
* Escape and encode a string regarded as within the query component of an
* URI with the default protocol charset.
* When a query comprise the name and value pairs, it is used in order
* to encode each name and value string. The reserved special characters
* within a query component are being included in encoding the query.
*
* @param unescaped an unescaped string
* @return the escaped string
*
* @throws URIException if the default protocol charset is not supported
*
* @see URI#getDefaultProtocolCharset
* @see #encode
*/
public static String encodeWithinQuery(String unescaped)
throws URIException {
return encodeWithinQuery(unescaped, URI.getDefaultProtocolCharset());
}
/**
* Escape and encode a string regarded as within the query component of an
* URI with a given charset.
* When a query comprise the name and value pairs, it is used in order
* to encode each name and value string. The reserved special characters
* within a query component are being included in encoding the query.
*
* @param unescaped an unescaped string
* @param charset the charset
* @return the escaped string
*
* @throws URIException if the charset is not supported
*
* @see #encode
*/
public static String encodeWithinQuery(String unescaped, String charset)
throws URIException {
return encode(unescaped, URI.allowed_within_query, charset);
}
/**
* Escape and encode a string regarded as the query component of an URI with
* the default protocol charset.
* When a query string is not misunderstood the reserved special characters
* ("&", "=", "+", ",", and "$") within a query component, this method
* is recommended to use in encoding the whole query.
*
* @param unescaped an unescaped string
* @return the escaped string
*
* @throws URIException if the default protocol charset is not supported
*
* @see URI#getDefaultProtocolCharset
* @see #encode
*/
public static String encodeQuery(String unescaped) throws URIException {
return encodeQuery(unescaped, URI.getDefaultProtocolCharset());
}
/**
* Escape and encode a string regarded as the query component of an URI with
* a given charset.
* When a query string is not misunderstood the reserved special characters
* ("&", "=", "+", ",", and "$") within a query component, this method
* is recommended to use in encoding the whole query.
*
* @param unescaped an unescaped string
* @param charset the charset
* @return the escaped string
*
* @throws URIException if the charset is not supported
*
* @see #encode
*/
public static String encodeQuery(String unescaped, String charset)
throws URIException {
return encode(unescaped, URI.allowed_query, charset);
}
/**
* Escape and encode a given string with allowed characters not to be
* escaped and the default protocol charset.
*
* @param unescaped a string
* @param allowed allowed characters not to be escaped
* @return the escaped string
*
* @throws URIException if the default protocol charset is not supported
*
* @see URI#getDefaultProtocolCharset
* @see Coder#encode
*/
public static String encode(String unescaped, BitSet allowed)
throws URIException {
return encode(unescaped, allowed, URI.getDefaultProtocolCharset());
}
/**
* Escape and encode a given string with allowed characters not to be
* escaped and a given charset.
*
* @param unescaped a string
* @param allowed allowed characters not to be escaped
* @param charset the charset
* @return the escaped string
*
* @throws URIException if the charset is not supported
*
* @see Coder#encode
*/
public static String encode(String unescaped, BitSet allowed,
String charset) throws URIException {
return new String(Coder.encode(unescaped, allowed, charset));
}
/**
* Unescape and decode a given string regarded as an escaped string with the
* default protocol charset.
*
* @param escaped a string
* @return the unescaped string
*
* @throws URIException if the default protocol charset is not supported
*
* @see URI#getDefaultProtocolCharset
* @see Coder#decode
*/
public static String decode(String escaped) throws URIException {
return Coder.decode(escaped.toCharArray(), URI.getDefaultProtocolCharset());
}
/**
* Unescape and decode a given string regarded as an escaped string.
*
* @param escaped a string
* @param charset the charset
* @return the unescaped string
*
* @throws URIException if the charset is not supported
*
* @see Coder#decode
*/
public static String decode(String escaped, String charset)
throws URIException {
return Coder.decode(escaped.toCharArray(), charset);
}
// --------------------------------- transforming a string between charsets
/**
* Convert a target string to the specified character encoded string with
* the default protocol charset.
*
* @param target a target string
* @return the protocol character encoded string
*
* @throws URIException if the default protocol charset is not supported
*
* @see URI#getDefaultProtocolCharset
*
* @deprecated Do not use. To be removed
*/
public static String toProtocolCharset(String target) throws URIException {
return toUsingCharset(
target,
URI.getDefaultDocumentCharset(),
URI.getDefaultProtocolCharset());
}
/**
* Convert a target string to the specified character encoded string with
* a given protocol charset.
*
* @param target a target string
* @param charset the transformed protocol charset
* @return the protocol character encoded string
*
* @throws URIException if the charset is not supported
*
* @deprecated Do not use. To be removed
*/
public static String toProtocolCharset(String target, String charset)
throws URIException {
return toUsingCharset(target, URI.getDefaultDocumentCharset(), charset);
}
/**
* Convert a target string to the specified character encoded string with
* the default document charset.
*
* @param target a target string
* @return the document character encoded string
*
* @throws URIException if the default protocol charset is not supported
*
* @see URI#getDefaultDocumentCharset
*
* @deprecated Do not use. To be removed
*/
public static String toDocumentCharset(String target) throws URIException {
return toUsingCharset(target, URI.getDefaultProtocolCharset(),
URI.getDefaultDocumentCharset());
}
/**
* Convert a target string to the specified character encoded string with
* a given document charset.
*
* @param target a target string
* @param charset the transformed document charset
* @return the document character encoded string
*
* @throws URIException if the charset is not supported
*
* @deprecated Do not use. To be removed
*/
public static String toDocumentCharset(String target, String charset)
throws URIException {
return toUsingCharset(target, URI.getDefaultProtocolCharset(), charset);
}
/**
* Convert a target string from the fromCharset charset to
* the toCharset charset.
*
* What if the document charset is ISO-8859-1 and the protocol charset is
* UTF-8, when it's read from the document part and is used in the protocol
* part, the use of the method will be toUsingCharset(the string,
* "ISO-8859-1", "UTF-8").
*
* @param target a target string
* @param fromCharset the previous charset
* @param toCharset the changing charset
* @return the document character encoded string
*
* @throws URIException if either of the charsets are not supported
*
* @deprecated Do not use. To be removed
*/
public static String toUsingCharset(String target, String fromCharset,
String toCharset) throws URIException {
try {
return new String(target.getBytes(fromCharset), toCharset);
} catch (UnsupportedEncodingException error) {
throw new URIException(URIException.UNSUPPORTED_ENCODING,
error.getMessage());
}
}
// ---------------------------------------------------------- Inner classes
/**
* The basic and internal utility for URI escape and character encoding and
* decoding.
*/
protected static class Coder extends URI {
/**
* Escape and encode a given string with allowed characters not to be
* escaped.
*
* @param unescapedComponent an unescaped component
* @param allowed allowed characters not to be escaped
* @param charset the charset to encode
* @return the escaped and encoded string
*
* @throws URIException if the charset is not supported
*/
public static char[] encode(String unescapedComponent, BitSet allowed, String charset)
throws URIException {
return URI.encode(unescapedComponent, allowed, charset);
}
/**
* Unescape and decode a given string.
*
* @param escapedComponent an being-unescaped component
* @param charset the charset to decode
* @return the escaped and encoded string
*
* @throws URIException if the charset is not supported
*/
public static String decode(char[] escapedComponent, String charset)
throws URIException {
return URI.decode(escapedComponent, charset);
}
/**
* Verify whether a given string is escaped or not
*
* @param original given characters
* @return true if the given character array is 7 bit ASCII-compatible.
*/
public static boolean verifyEscaped(char[] original) {
for (int i = 0; i < original.length; i++) {
int c = original[i];
if (c > 128) {
return false;
} else if (c == '%') {
if (Character.digit(original[++i], 16) == -1
|| Character.digit(original[++i], 16) == -1) {
return false;
}
}
}
return true;
}
/**
* Replace from a given character to given character in an array order
* for a given string.
*
* @param original a given string
* @param from a replacing character array
* @param to a replaced character array
* @return the replaced string
*/
public static String replace(String original, char[] from, char[] to) {
for (int i = from.length; i > 0; --i) {
original = replace(original, from[i], to[i]);
}
return original.toString();
}
/**
* Replace from a given character to given character for a given string.
*
* @param original a given string
* @param from a replacing character array
* @param to a replaced character array
* @return the replaced string
*/
public static String replace(String original, char from, char to) {
StringBuffer result = new StringBuffer(original.length());
int at, saved = 0;
do {
at = original.indexOf(from);
if (at >= 0) {
result.append(original.substring(0, at));
result.append(to);
} else {
result.append(original.substring(saved));
}
saved = at;
} while (at >= 0);
return result.toString();
}
}
}
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