/*
* @(#)URLStreamHandler.java 1.53 05/03/12
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package com.sun.perseus.platform;
/**
* The abstract class <code>URLStreamHandler</code> is the common
* superclass for all stream protocol handlers. A stream protocol
* handler knows how to make a connection for a particular protocol
* type, such as <code>http</code>.
* <p>
* In most cases, an instance of a <code>URLStreamHandler</code>
* subclass is not created directly by an application. Rather, the
* first time a protocol name is encountered when constructing a
* <code>URL</code>, the appropriate stream protocol handler is
* automatically loaded.
*
*/
class PURLStreamHandler {
/**
* Converts a <code>URL</code> of a specific protocol to a
* <code>String</code>.
*
* @param u the URL.
* @return a string representation of the <code>URL</code> argument.
*/
protected static String toExternalForm(PURL u) {
// pre-compute length of StringBuffer
int len = u.getProtocol().length() + 1;
if (u.getAuthority() != null && u.getAuthority().length() > 0)
len += 2 + u.getAuthority().length();
if (u.getPath() != null) {
len += u.getPath().length();
}
if (u.getQuery() != null) {
len += 1 + u.getQuery().length();
}
if (u.getRef() != null)
len += 1 + u.getRef().length();
StringBuffer result = new StringBuffer(len);
result.append(u.getProtocol());
result.append(":");
if (u.getAuthority() != null && u.getAuthority().length() > 0) {
result.append("//");
result.append(u.getAuthority());
}
if (u.getPath() != null) {
result.append(u.getPath());
}
if (u.getQuery() != null) {
result.append('?');
result.append(u.getQuery());
}
if (u.getRef() != null) {
result.append("#");
result.append(u.getRef());
}
return result.toString();
}
/**
* Sets the fields of the <code>URL</code> argument to the indicated values.
* Only classes derived from URLStreamHandler are supposed to be able
* to call the set method on a URL.
*
* @param u the URL to modify.
* @param protocol the protocol name.
* @param host the remote host value for the URL.
* @param port the port on the remote machine.
* @param authority the authority part for the URL.
* @param userInfo the userInfo part of the URL.
* @param path the path component of the URL.
* @param query the query part for the URL.
* @param ref the reference.
* @exception SecurityException if the protocol handler of the URL is
* different from this one
* @see java.net.URL#set(java.lang.String, java.lang.String, int, java.lang.String, java.lang.String)
*/
protected static void setURL(PURL u, String protocol, String host, int port,
String authority, String userInfo, String path,
String query, String ref) {
// ensure that no one can reset the protocol on a given URL.
u.set(u.getProtocol(), host, port, authority, userInfo, path, query, ref);
}
/**
* Parses the string representation of a <code>URL</code> into a
* <code>URL</code> object.
* <p>
* If there is any inherited context, then it has already been
* copied into the <code>URL</code> argument.
* <p>
* The <code>parseURL</code> method of <code>URLStreamHandler</code>
* parses the string representation as if it were an
* <code>http</code> specification. Most URL protocol families have a
* similar parsing. A stream protocol handler for a protocol that has
* a different syntax must override this routine.
*
* @param u the <code>URL</code> to receive the result of parsing
* the spec.
* @param spec the <code>String</code> representing the URL that
* must be parsed.
* @param start the character index at which to begin parsing. This is
* just past the '<code>:</code>' (if there is one) that
* specifies the determination of the protocol name.
* @param limit the character position to stop parsing at. This is the
* end of the string or the position of the
* "<code>#</code>" character, if present. All information
* after the sharp sign indicates an anchor.
*/
public static void parseURL(PURL u, String spec, int start, int limit) {
// These fields may receive context content if this was relative URL
String protocol = u.getProtocol();
String authority = u.getAuthority();
String userInfo = u.getUserInfo();
String host = u.getHost();
int port = u.getPort();
String path = u.getPath();
String query = u.getQuery();
// This field has already been parsed
String ref = u.getRef();
boolean isRelPath = false;
boolean queryOnly = false;
// FIX: should not assume query if opaque
// Strip off the query part
if (start < limit) {
int queryStart = spec.indexOf('?');
queryOnly = queryStart == start;
if ((queryStart != -1) && (queryStart < limit)) {
query = spec.substring(queryStart+1, limit);
if (limit > queryStart)
limit = queryStart;
spec = spec.substring(0, queryStart);
}
}
int i = 0;
// Parse the authority part if any
if ((start <= limit - 2) && (spec.charAt(start) == '/') &&
(spec.charAt(start + 1) == '/')) {
start += 2;
i = spec.indexOf('/', start);
if (i < 0) {
i = spec.indexOf('?', start);
if (i < 0)
i = limit;
}
host = authority = spec.substring(start, i);
int ind = authority.indexOf('@');
if (ind != -1) {
userInfo = authority.substring(0, ind);
host = authority.substring(ind+1);
} else {
userInfo = null;
}
if (host != null) {
// If the host is surrounded by [ and ] then its an IPv6
// literal address as specified in RFC2732
if (host.length()>0 && (host.charAt(0) == '[')) {
//PURLStreamHandler has been modified - it does not
//handle IPV6 addresses
//this is an ipv6 address
throw new Error("Can't handle IPv6 addresses!");
} else {
ind = host.indexOf(':');
port = -1;
if (ind >= 0) {
// port can be null according to RFC2396
if (host.length() > (ind + 1)) {
port = Integer.parseInt(host.substring(ind + 1));
}
host = host.substring(0, ind);
}
}
} else {
host = "";
}
if (port < -1)
throw new IllegalArgumentException("Invalid port number :" +
port);
start = i;
// If the authority is defined then the path is defined by the
// spec only; See RFC 2396 Section 5.2.4.
if (authority != null && authority.length() > 0)
path = "";
}
if (host == null) {
host = "";
}
// Parse the file path if any
if (start < limit) {
if (spec.charAt(start) == '/') {
path = spec.substring(start, limit);
} else if (path != null && path.length() > 0) {
isRelPath = true;
int ind = path.lastIndexOf('/');
String seperator = "";
if (ind == -1 && authority != null)
seperator = "/";
path = path.substring(0, ind + 1) + seperator +
spec.substring(start, limit);
} else {
String seperator = (authority != null) ? "/" : "";
path = seperator + spec.substring(start, limit);
}
} else if (queryOnly && path != null) {
int ind = path.lastIndexOf('/');
if (ind < 0)
ind = 0;
path = path.substring(0, ind) + "/";
}
if (path == null)
path = "";
if (isRelPath) {
// Remove embedded /./
while ((i = path.indexOf("/./")) >= 0) {
path = path.substring(0, i) + path.substring(i + 2);
}
// Remove embedded /../ if possible
i = 0;
while ((i = path.indexOf("/../", i)) > 0) {
if ((limit = path.lastIndexOf('/', i - 1)) >= 0) {
path = path.substring(0, limit) + path.substring(i + 3);
i = 0;
} else {
i = i + 3;
}
}
// Remove trailing .. if possible
while (path.endsWith("/..")) {
i = path.indexOf("/..");
if ((limit = path.lastIndexOf('/', i - 1)) >= 0) {
path = path.substring(0, limit+1);
} else {
break;
}
}
// Remove starting .
if (path.startsWith("./") && path.length() > 2)
path = path.substring(2);
// Remove trailing .
if (path.endsWith("/."))
path = path.substring(0, path.length() -1);
}
setURL(u, protocol, host, port, authority, userInfo, path, query, ref);
}
}
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