java.net.URLStreamHandler Maven / Gradle / Ivy
/*
* Copyright 2016 Carlos Ballesteros Velasco
*
* 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 java.net;
public abstract class URLStreamHandler {
//abstract protected URLConnection openConnection(URL u) throws IOException;
//
//protected URLConnection openConnection(URL u, Proxy p) throws IOException {
// throw new UnsupportedOperationException("Method not implemented.");
//}
protected void parseURL(URL 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
boolean isUNCName = (start <= limit - 4) &&
(spec.charAt(start) == '/') &&
(spec.charAt(start + 1) == '/') &&
(spec.charAt(start + 2) == '/') &&
(spec.charAt(start + 3) == '/');
if (!isUNCName && (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 (host.length() > 0 && (host.charAt(0) == '[')) {
if ((ind = host.indexOf(']')) > 2) {
String nhost = host;
host = nhost.substring(0, ind + 1);
port = -1;
if (nhost.length() > ind + 1) {
if (nhost.charAt(ind + 1) == ':') {
++ind;
// port can be null according to RFC2396
if (nhost.length() > (ind + 1)) {
port = Integer.parseInt(nhost.substring(ind + 1));
}
} else {
throw new IllegalArgumentException(
"Invalid authority field: " + authority);
}
}
} else {
throw new IllegalArgumentException(
"Invalid authority field: " + authority);
}
} 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) {
/*
* A "/../" will cancel the previous segment and itself,
* unless that segment is a "/../" itself
* i.e. "/a/b/../c" becomes "/a/c"
* but "/../../a" should stay unchanged
*/
if (i > 0 && (limit = path.lastIndexOf('/', i - 1)) >= 0 &&
(path.indexOf("/../", limit) != 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;
}
}
if (path.startsWith("./") && path.length() > 2) path = path.substring(2);
if (path.endsWith("/.")) path = path.substring(0, path.length() - 1);
}
setURL(u, protocol, host, port, authority, userInfo, path, query, ref);
}
protected int getDefaultPort() {
return -1;
}
protected boolean equals(URL u1, URL u2) {
String ref1 = u1.getRef();
String ref2 = u2.getRef();
return (ref1 == ref2 || (ref1 != null && ref1.equals(ref2))) &&
sameFile(u1, u2);
}
protected int hashCode(URL u) {
int h = 0;
// Generate the protocol part.
String protocol = u.getProtocol();
if (protocol != null)
h += protocol.hashCode();
// Generate the host part.
InetAddress addr = getHostAddress(u);
if (addr != null) {
h += addr.hashCode();
} else {
String host = u.getHost();
if (host != null)
h += host.toLowerCase().hashCode();
}
// Generate the file part.
String file = u.getFile();
if (file != null)
h += file.hashCode();
// Generate the port part.
if (u.getPort() == -1)
h += getDefaultPort();
else
h += u.getPort();
// Generate the ref part.
String ref = u.getRef();
if (ref != null)
h += ref.hashCode();
return h;
}
protected boolean sameFile(URL u1, URL u2) {
// Compare the protocols.
if (!((u1.getProtocol() == u2.getProtocol()) ||
(u1.getProtocol() != null &&
u1.getProtocol().equalsIgnoreCase(u2.getProtocol()))))
return false;
// Compare the files.
if (!(u1.getFile() == u2.getFile() ||
(u1.getFile() != null && u1.getFile().equals(u2.getFile()))))
return false;
// Compare the ports.
int port1, port2;
port1 = (u1.getPort() != -1) ? u1.getPort() : u1.handler.getDefaultPort();
port2 = (u2.getPort() != -1) ? u2.getPort() : u2.handler.getDefaultPort();
if (port1 != port2)
return false;
// Compare the hosts.
if (!hostsEqual(u1, u2))
return false;
return true;
}
protected synchronized InetAddress getHostAddress(URL u) {
if (u.hostAddress != null)
return u.hostAddress;
String host = u.getHost();
if (host == null || host.equals("")) {
return null;
} else {
try {
u.hostAddress = InetAddress.getByName(host);
} catch (UnknownHostException ex) {
return null;
} catch (SecurityException se) {
return null;
}
}
return u.hostAddress;
}
protected boolean hostsEqual(URL u1, URL u2) {
InetAddress a1 = getHostAddress(u1);
InetAddress a2 = getHostAddress(u2);
// if we have internet address for both, compare them
if (a1 != null && a2 != null) {
return a1.equals(a2);
// else, if both have host names, compare them
} else if (u1.getHost() != null && u2.getHost() != null)
return u1.getHost().equalsIgnoreCase(u2.getHost());
else
return u1.getHost() == null && u2.getHost() == null;
}
protected String toExternalForm(URL 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();
}
protected void setURL(URL u, String protocol, String host, int port, String authority, String userInfo, String path, String query, String ref) {
if (this != u.handler) {
throw new SecurityException("handler for url different from " +
"this handler");
}
// ensure that no one can reset the protocol on a given URL.
u.set(u.getProtocol(), host, port, authority, userInfo, path, query, ref);
}
@Deprecated
protected void setURL(URL u, String protocol, String host, int port, String file, String ref) {
String authority = null;
String userInfo = null;
if (host != null && host.length() != 0) {
authority = (port == -1) ? host : host + ":" + port;
int at = host.lastIndexOf('@');
if (at != -1) {
userInfo = host.substring(0, at);
host = host.substring(at + 1);
}
}
String path = null;
String query = null;
if (file != null) {
int q = file.lastIndexOf('?');
if (q != -1) {
query = file.substring(q + 1);
path = file.substring(0, q);
} else {
path = file;
}
}
setURL(u, protocol, host, port, authority, userInfo, path, query, ref);
}
}
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