org.eclipse.jetty.util.URIUtil Maven / Gradle / Ivy
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// ========================================================================
// Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
package org.eclipse.jetty.util;
import java.io.UnsupportedEncodingException;
/* ------------------------------------------------------------ */
/** URI Holder.
* This class assists with the decoding and encoding or HTTP URI's.
* It differs from the java.net.URL class as it does not provide
* communications ability, but it does assist with query string
* formatting.
* UTF-8 encoding is used by default for % encoded characters. This
* may be overridden with the org.eclipse.jetty.util.URI.charset system property.
* @see UrlEncoded
*
*/
public class URIUtil
implements Cloneable
{
public static final String SLASH="/";
public static final String HTTP="http";
public static final String HTTP_COLON="http:";
public static final String HTTPS="https";
public static final String HTTPS_COLON="https:";
// Use UTF-8 as per http://www.w3.org/TR/html40/appendix/notes.html#non-ascii-chars
public static final String __CHARSET=System.getProperty("org.eclipse.jetty.util.URI.charset",StringUtil.__UTF8);
private URIUtil()
{}
/* ------------------------------------------------------------ */
/** Encode a URI path.
* This is the same encoding offered by URLEncoder, except that
* the '/' character is not encoded.
* @param path The path the encode
* @return The encoded path
*/
public static String encodePath(String path)
{
if (path==null || path.length()==0)
return path;
StringBuilder buf = encodePath(null,path);
return buf==null?path:buf.toString();
}
/* ------------------------------------------------------------ */
/** Encode a URI path.
* @param path The path the encode
* @param buf StringBuilder to encode path into (or null)
* @return The StringBuilder or null if no substitutions required.
*/
public static StringBuilder encodePath(StringBuilder buf, String path)
{
if (buf==null)
{
loop:
for (int i=0;i':
case ' ':
buf=new StringBuilder(path.length()<<1);
break loop;
}
}
if (buf==null)
return null;
}
synchronized(buf)
{
for (int i=0;i':
buf.append("%3E");
continue;
case ' ':
buf.append("%20");
continue;
default:
buf.append(c);
continue;
}
}
}
return buf;
}
/* ------------------------------------------------------------ */
/** Encode a URI path.
* @param path The path the encode
* @param buf StringBuilder to encode path into (or null)
* @param encode String of characters to encode. % is always encoded.
* @return The StringBuilder or null if no substitutions required.
*/
public static StringBuilder encodeString(StringBuilder buf,
String path,
String encode)
{
if (buf==null)
{
loop:
for (int i=0;i=0)
{
buf=new StringBuilder(path.length()<<1);
break loop;
}
}
if (buf==null)
return null;
}
synchronized(buf)
{
for (int i=0;i=0)
{
buf.append('%');
StringUtil.append(buf,(byte)(0xff&c),16);
}
else
buf.append(c);
}
}
return buf;
}
/* ------------------------------------------------------------ */
/* Decode a URI path.
* @param path The path the encode
* @param buf StringBuilder to encode path into
*/
public static String decodePath(String path)
{
if (path==null)
return null;
char[] chars=null;
int n=0;
byte[] bytes=null;
int b=0;
int len=path.length();
for (int i=0;i0)
{
String s;
try
{
s=new String(bytes,0,b,__CHARSET);
}
catch (UnsupportedEncodingException e)
{
s=new String(bytes,0,b);
}
s.getChars(0,s.length(),chars,n);
n+=s.length();
b=0;
}
chars[n++]=c;
}
if (chars==null)
return path;
if (b>0)
{
String s;
try
{
s=new String(bytes,0,b,__CHARSET);
}
catch (UnsupportedEncodingException e)
{
s=new String(bytes,0,b);
}
s.getChars(0,s.length(),chars,n);
n+=s.length();
}
return new String(chars,0,n);
}
/* ------------------------------------------------------------ */
/* Decode a URI path.
* @param path The path the encode
* @param buf StringBuilder to encode path into
*/
public static String decodePath(byte[] buf, int offset, int length)
{
byte[] bytes=null;
int n=0;
for (int i=0;i=0)
return p.substring(0,slash+1);
return null;
}
/* ------------------------------------------------------------ */
/** Strip parameters from a path.
* Return path upto any semicolon parameters.
*/
public static String stripPath(String path)
{
if (path==null)
return null;
int semi=path.indexOf(';');
if (semi<0)
return path;
return path.substring(0,semi);
}
/* ------------------------------------------------------------ */
/** Convert a path to a cananonical form.
* All instances of "." and ".." are factored out. Null is returned
* if the path tries to .. above its root.
* @param path
* @return path or null.
*/
public static String canonicalPath(String path)
{
if (path==null || path.length()==0)
return path;
int end=path.length();
int start = path.lastIndexOf('/', end);
search:
while (end>0)
{
switch(end-start)
{
case 2: // possible single dot
if (path.charAt(start+1)!='.')
break;
break search;
case 3: // possible double dot
if (path.charAt(start+1)!='.' || path.charAt(start+2)!='.')
break;
break search;
}
end=start;
start=path.lastIndexOf('/',end-1);
}
// If we have checked the entire string
if (start>=end)
return path;
StringBuilder buf = new StringBuilder(path);
int delStart=-1;
int delEnd=-1;
int skip=0;
while (end>0)
{
switch(end-start)
{
case 2: // possible single dot
if (buf.charAt(start+1)!='.')
{
if (skip>0 && --skip==0)
{
delStart=start>=0?start:0;
if(delStart>0 && delEnd==buf.length() && buf.charAt(delEnd-1)=='.')
delStart++;
}
break;
}
if(start<0 && buf.length()>2 && buf.charAt(1)=='/' && buf.charAt(2)=='/')
break;
if(delEnd<0)
delEnd=end;
delStart=start;
if (delStart<0 || delStart==0&&buf.charAt(delStart)=='/')
{
delStart++;
if (delEnd=0 && buf.charAt(start)!='/')
start--;
continue;
case 3: // possible double dot
if (buf.charAt(start+1)!='.' || buf.charAt(start+2)!='.')
{
if (skip>0 && --skip==0)
{ delStart=start>=0?start:0;
if(delStart>0 && delEnd==buf.length() && buf.charAt(delEnd-1)=='.')
delStart++;
}
break;
}
delStart=start;
if (delEnd<0)
delEnd=end;
skip++;
end=start--;
while (start>=0 && buf.charAt(start)!='/')
start--;
continue;
default:
if (skip>0 && --skip==0)
{
delStart=start>=0?start:0;
if(delEnd==buf.length() && buf.charAt(delEnd-1)=='.')
delStart++;
}
}
// Do the delete
if (skip<=0 && delStart>=0 && delEnd>=delStart)
{
buf.delete(delStart,delEnd);
delStart=delEnd=-1;
if (skip>0)
delEnd=end;
}
end=start--;
while (start>=0 && buf.charAt(start)!='/')
start--;
}
// Too many ..
if (skip>0)
return null;
// Do the delete
if (delEnd>=0)
buf.delete(delStart,delEnd);
return buf.toString();
}
/* ------------------------------------------------------------ */
/** Convert a path to a compact form.
* All instances of "//" and "///" etc. are factored out to single "/"
* @param path
* @return path
*/
public static String compactPath(String path)
{
if (path==null || path.length()==0)
return path;
int state=0;
int end=path.length();
int i=0;
loop:
while (i='a'&&c<='z' ||
c>='A'&&c<='Z' ||
(i>0 &&(c>='0'&&c<='9' ||
c=='.' ||
c=='+' ||
c=='-'))
))
break;
}
return false;
}
}