It will be easier to get the logic from inside the URLSteamHandler than to try to mimic it
1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/emul/src/main/java/java/net/URLStreamHandler.java Sun Dec 16 20:13:00 2012 +0100
1.3 @@ -0,0 +1,590 @@
1.4 +/*
1.5 + * Copyright (c) 1995, 2006, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package java.net;
1.30 +
1.31 +import java.io.IOException;
1.32 +import java.io.InputStream;
1.33 +import java.io.File;
1.34 +import java.io.OutputStream;
1.35 +import java.util.Hashtable;
1.36 +import sun.net.util.IPAddressUtil;
1.37 +import sun.net.www.ParseUtil;
1.38 +
1.39 +/**
1.40 + * The abstract class <code>URLStreamHandler</code> is the common
1.41 + * superclass for all stream protocol handlers. A stream protocol
1.42 + * handler knows how to make a connection for a particular protocol
1.43 + * type, such as <code>http</code>, <code>ftp</code>, or
1.44 + * <code>gopher</code>.
1.45 + * <p>
1.46 + * In most cases, an instance of a <code>URLStreamHandler</code>
1.47 + * subclass is not created directly by an application. Rather, the
1.48 + * first time a protocol name is encountered when constructing a
1.49 + * <code>URL</code>, the appropriate stream protocol handler is
1.50 + * automatically loaded.
1.51 + *
1.52 + * @author James Gosling
1.53 + * @see java.net.URL#URL(java.lang.String, java.lang.String, int, java.lang.String)
1.54 + * @since JDK1.0
1.55 + */
1.56 +public abstract class URLStreamHandler {
1.57 + /**
1.58 + * Opens a connection to the object referenced by the
1.59 + * <code>URL</code> argument.
1.60 + * This method should be overridden by a subclass.
1.61 + *
1.62 + * <p>If for the handler's protocol (such as HTTP or JAR), there
1.63 + * exists a public, specialized URLConnection subclass belonging
1.64 + * to one of the following packages or one of their subpackages:
1.65 + * java.lang, java.io, java.util, java.net, the connection
1.66 + * returned will be of that subclass. For example, for HTTP an
1.67 + * HttpURLConnection will be returned, and for JAR a
1.68 + * JarURLConnection will be returned.
1.69 + *
1.70 + * @param u the URL that this connects to.
1.71 + * @return a <code>URLConnection</code> object for the <code>URL</code>.
1.72 + * @exception IOException if an I/O error occurs while opening the
1.73 + * connection.
1.74 + */
1.75 + abstract protected URLConnection openConnection(URL u) throws IOException;
1.76 +
1.77 + /**
1.78 + * Same as openConnection(URL), except that the connection will be
1.79 + * made through the specified proxy; Protocol handlers that do not
1.80 + * support proxying will ignore the proxy parameter and make a
1.81 + * normal connection.
1.82 + *
1.83 + * Calling this method preempts the system's default ProxySelector
1.84 + * settings.
1.85 + *
1.86 + * @param u the URL that this connects to.
1.87 + * @param p the proxy through which the connection will be made.
1.88 + * If direct connection is desired, Proxy.NO_PROXY
1.89 + * should be specified.
1.90 + * @return a <code>URLConnection</code> object for the <code>URL</code>.
1.91 + * @exception IOException if an I/O error occurs while opening the
1.92 + * connection.
1.93 + * @exception IllegalArgumentException if either u or p is null,
1.94 + * or p has the wrong type.
1.95 + * @exception UnsupportedOperationException if the subclass that
1.96 + * implements the protocol doesn't support this method.
1.97 + * @since 1.5
1.98 + */
1.99 + protected URLConnection openConnection(URL u, Proxy p) throws IOException {
1.100 + throw new UnsupportedOperationException("Method not implemented.");
1.101 + }
1.102 +
1.103 + /**
1.104 + * Parses the string representation of a <code>URL</code> into a
1.105 + * <code>URL</code> object.
1.106 + * <p>
1.107 + * If there is any inherited context, then it has already been
1.108 + * copied into the <code>URL</code> argument.
1.109 + * <p>
1.110 + * The <code>parseURL</code> method of <code>URLStreamHandler</code>
1.111 + * parses the string representation as if it were an
1.112 + * <code>http</code> specification. Most URL protocol families have a
1.113 + * similar parsing. A stream protocol handler for a protocol that has
1.114 + * a different syntax must override this routine.
1.115 + *
1.116 + * @param u the <code>URL</code> to receive the result of parsing
1.117 + * the spec.
1.118 + * @param spec the <code>String</code> representing the URL that
1.119 + * must be parsed.
1.120 + * @param start the character index at which to begin parsing. This is
1.121 + * just past the '<code>:</code>' (if there is one) that
1.122 + * specifies the determination of the protocol name.
1.123 + * @param limit the character position to stop parsing at. This is the
1.124 + * end of the string or the position of the
1.125 + * "<code>#</code>" character, if present. All information
1.126 + * after the sharp sign indicates an anchor.
1.127 + */
1.128 + protected void parseURL(URL u, String spec, int start, int limit) {
1.129 + // These fields may receive context content if this was relative URL
1.130 + String protocol = u.getProtocol();
1.131 + String authority = u.getAuthority();
1.132 + String userInfo = u.getUserInfo();
1.133 + String host = u.getHost();
1.134 + int port = u.getPort();
1.135 + String path = u.getPath();
1.136 + String query = u.getQuery();
1.137 +
1.138 + // This field has already been parsed
1.139 + String ref = u.getRef();
1.140 +
1.141 + boolean isRelPath = false;
1.142 + boolean queryOnly = false;
1.143 +
1.144 +// FIX: should not assume query if opaque
1.145 + // Strip off the query part
1.146 + if (start < limit) {
1.147 + int queryStart = spec.indexOf('?');
1.148 + queryOnly = queryStart == start;
1.149 + if ((queryStart != -1) && (queryStart < limit)) {
1.150 + query = spec.substring(queryStart+1, limit);
1.151 + if (limit > queryStart)
1.152 + limit = queryStart;
1.153 + spec = spec.substring(0, queryStart);
1.154 + }
1.155 + }
1.156 +
1.157 + int i = 0;
1.158 + // Parse the authority part if any
1.159 + boolean isUNCName = (start <= limit - 4) &&
1.160 + (spec.charAt(start) == '/') &&
1.161 + (spec.charAt(start + 1) == '/') &&
1.162 + (spec.charAt(start + 2) == '/') &&
1.163 + (spec.charAt(start + 3) == '/');
1.164 + if (!isUNCName && (start <= limit - 2) && (spec.charAt(start) == '/') &&
1.165 + (spec.charAt(start + 1) == '/')) {
1.166 + start += 2;
1.167 + i = spec.indexOf('/', start);
1.168 + if (i < 0) {
1.169 + i = spec.indexOf('?', start);
1.170 + if (i < 0)
1.171 + i = limit;
1.172 + }
1.173 +
1.174 + host = authority = spec.substring(start, i);
1.175 +
1.176 + int ind = authority.indexOf('@');
1.177 + if (ind != -1) {
1.178 + userInfo = authority.substring(0, ind);
1.179 + host = authority.substring(ind+1);
1.180 + } else {
1.181 + userInfo = null;
1.182 + }
1.183 + if (host != null) {
1.184 + // If the host is surrounded by [ and ] then its an IPv6
1.185 + // literal address as specified in RFC2732
1.186 + if (host.length()>0 && (host.charAt(0) == '[')) {
1.187 + if ((ind = host.indexOf(']')) > 2) {
1.188 +
1.189 + String nhost = host ;
1.190 + host = nhost.substring(0,ind+1);
1.191 + if (!IPAddressUtil.
1.192 + isIPv6LiteralAddress(host.substring(1, ind))) {
1.193 + throw new IllegalArgumentException(
1.194 + "Invalid host: "+ host);
1.195 + }
1.196 +
1.197 + port = -1 ;
1.198 + if (nhost.length() > ind+1) {
1.199 + if (nhost.charAt(ind+1) == ':') {
1.200 + ++ind ;
1.201 + // port can be null according to RFC2396
1.202 + if (nhost.length() > (ind + 1)) {
1.203 + port = Integer.parseInt(nhost.substring(ind+1));
1.204 + }
1.205 + } else {
1.206 + throw new IllegalArgumentException(
1.207 + "Invalid authority field: " + authority);
1.208 + }
1.209 + }
1.210 + } else {
1.211 + throw new IllegalArgumentException(
1.212 + "Invalid authority field: " + authority);
1.213 + }
1.214 + } else {
1.215 + ind = host.indexOf(':');
1.216 + port = -1;
1.217 + if (ind >= 0) {
1.218 + // port can be null according to RFC2396
1.219 + if (host.length() > (ind + 1)) {
1.220 + port = Integer.parseInt(host.substring(ind + 1));
1.221 + }
1.222 + host = host.substring(0, ind);
1.223 + }
1.224 + }
1.225 + } else {
1.226 + host = "";
1.227 + }
1.228 + if (port < -1)
1.229 + throw new IllegalArgumentException("Invalid port number :" +
1.230 + port);
1.231 + start = i;
1.232 + // If the authority is defined then the path is defined by the
1.233 + // spec only; See RFC 2396 Section 5.2.4.
1.234 + if (authority != null && authority.length() > 0)
1.235 + path = "";
1.236 + }
1.237 +
1.238 + if (host == null) {
1.239 + host = "";
1.240 + }
1.241 +
1.242 + // Parse the file path if any
1.243 + if (start < limit) {
1.244 + if (spec.charAt(start) == '/') {
1.245 + path = spec.substring(start, limit);
1.246 + } else if (path != null && path.length() > 0) {
1.247 + isRelPath = true;
1.248 + int ind = path.lastIndexOf('/');
1.249 + String seperator = "";
1.250 + if (ind == -1 && authority != null)
1.251 + seperator = "/";
1.252 + path = path.substring(0, ind + 1) + seperator +
1.253 + spec.substring(start, limit);
1.254 +
1.255 + } else {
1.256 + String seperator = (authority != null) ? "/" : "";
1.257 + path = seperator + spec.substring(start, limit);
1.258 + }
1.259 + } else if (queryOnly && path != null) {
1.260 + int ind = path.lastIndexOf('/');
1.261 + if (ind < 0)
1.262 + ind = 0;
1.263 + path = path.substring(0, ind) + "/";
1.264 + }
1.265 + if (path == null)
1.266 + path = "";
1.267 +
1.268 + if (isRelPath) {
1.269 + // Remove embedded /./
1.270 + while ((i = path.indexOf("/./")) >= 0) {
1.271 + path = path.substring(0, i) + path.substring(i + 2);
1.272 + }
1.273 + // Remove embedded /../ if possible
1.274 + i = 0;
1.275 + while ((i = path.indexOf("/../", i)) >= 0) {
1.276 + /*
1.277 + * A "/../" will cancel the previous segment and itself,
1.278 + * unless that segment is a "/../" itself
1.279 + * i.e. "/a/b/../c" becomes "/a/c"
1.280 + * but "/../../a" should stay unchanged
1.281 + */
1.282 + if (i > 0 && (limit = path.lastIndexOf('/', i - 1)) >= 0 &&
1.283 + (path.indexOf("/../", limit) != 0)) {
1.284 + path = path.substring(0, limit) + path.substring(i + 3);
1.285 + i = 0;
1.286 + } else {
1.287 + i = i + 3;
1.288 + }
1.289 + }
1.290 + // Remove trailing .. if possible
1.291 + while (path.endsWith("/..")) {
1.292 + i = path.indexOf("/..");
1.293 + if ((limit = path.lastIndexOf('/', i - 1)) >= 0) {
1.294 + path = path.substring(0, limit+1);
1.295 + } else {
1.296 + break;
1.297 + }
1.298 + }
1.299 + // Remove starting .
1.300 + if (path.startsWith("./") && path.length() > 2)
1.301 + path = path.substring(2);
1.302 +
1.303 + // Remove trailing .
1.304 + if (path.endsWith("/."))
1.305 + path = path.substring(0, path.length() -1);
1.306 + }
1.307 +
1.308 + setURL(u, protocol, host, port, authority, userInfo, path, query, ref);
1.309 + }
1.310 +
1.311 + /**
1.312 + * Returns the default port for a URL parsed by this handler. This method
1.313 + * is meant to be overidden by handlers with default port numbers.
1.314 + * @return the default port for a <code>URL</code> parsed by this handler.
1.315 + * @since 1.3
1.316 + */
1.317 + protected int getDefaultPort() {
1.318 + return -1;
1.319 + }
1.320 +
1.321 + /**
1.322 + * Provides the default equals calculation. May be overidden by handlers
1.323 + * for other protocols that have different requirements for equals().
1.324 + * This method requires that none of its arguments is null. This is
1.325 + * guaranteed by the fact that it is only called by java.net.URL class.
1.326 + * @param u1 a URL object
1.327 + * @param u2 a URL object
1.328 + * @return <tt>true</tt> if the two urls are
1.329 + * considered equal, ie. they refer to the same
1.330 + * fragment in the same file.
1.331 + * @since 1.3
1.332 + */
1.333 + protected boolean equals(URL u1, URL u2) {
1.334 + String ref1 = u1.getRef();
1.335 + String ref2 = u2.getRef();
1.336 + return (ref1 == ref2 || (ref1 != null && ref1.equals(ref2))) &&
1.337 + sameFile(u1, u2);
1.338 + }
1.339 +
1.340 + /**
1.341 + * Provides the default hash calculation. May be overidden by handlers for
1.342 + * other protocols that have different requirements for hashCode
1.343 + * calculation.
1.344 + * @param u a URL object
1.345 + * @return an <tt>int</tt> suitable for hash table indexing
1.346 + * @since 1.3
1.347 + */
1.348 + protected int hashCode(URL u) {
1.349 + int h = 0;
1.350 +
1.351 + // Generate the protocol part.
1.352 + String protocol = u.getProtocol();
1.353 + if (protocol != null)
1.354 + h += protocol.hashCode();
1.355 +
1.356 + // Generate the host part.
1.357 + InetAddress addr = getHostAddress(u);
1.358 + if (addr != null) {
1.359 + h += addr.hashCode();
1.360 + } else {
1.361 + String host = u.getHost();
1.362 + if (host != null)
1.363 + h += host.toLowerCase().hashCode();
1.364 + }
1.365 +
1.366 + // Generate the file part.
1.367 + String file = u.getFile();
1.368 + if (file != null)
1.369 + h += file.hashCode();
1.370 +
1.371 + // Generate the port part.
1.372 + if (u.getPort() == -1)
1.373 + h += getDefaultPort();
1.374 + else
1.375 + h += u.getPort();
1.376 +
1.377 + // Generate the ref part.
1.378 + String ref = u.getRef();
1.379 + if (ref != null)
1.380 + h += ref.hashCode();
1.381 +
1.382 + return h;
1.383 + }
1.384 +
1.385 + /**
1.386 + * Compare two urls to see whether they refer to the same file,
1.387 + * i.e., having the same protocol, host, port, and path.
1.388 + * This method requires that none of its arguments is null. This is
1.389 + * guaranteed by the fact that it is only called indirectly
1.390 + * by java.net.URL class.
1.391 + * @param u1 a URL object
1.392 + * @param u2 a URL object
1.393 + * @return true if u1 and u2 refer to the same file
1.394 + * @since 1.3
1.395 + */
1.396 + protected boolean sameFile(URL u1, URL u2) {
1.397 + // Compare the protocols.
1.398 + if (!((u1.getProtocol() == u2.getProtocol()) ||
1.399 + (u1.getProtocol() != null &&
1.400 + u1.getProtocol().equalsIgnoreCase(u2.getProtocol()))))
1.401 + return false;
1.402 +
1.403 + // Compare the files.
1.404 + if (!(u1.getFile() == u2.getFile() ||
1.405 + (u1.getFile() != null && u1.getFile().equals(u2.getFile()))))
1.406 + return false;
1.407 +
1.408 + // Compare the ports.
1.409 + int port1, port2;
1.410 + port1 = (u1.getPort() != -1) ? u1.getPort() : u1.handler.getDefaultPort();
1.411 + port2 = (u2.getPort() != -1) ? u2.getPort() : u2.handler.getDefaultPort();
1.412 + if (port1 != port2)
1.413 + return false;
1.414 +
1.415 + // Compare the hosts.
1.416 + if (!hostsEqual(u1, u2))
1.417 + return false;
1.418 +
1.419 + return true;
1.420 + }
1.421 +
1.422 + /**
1.423 + * Get the IP address of our host. An empty host field or a DNS failure
1.424 + * will result in a null return.
1.425 + *
1.426 + * @param u a URL object
1.427 + * @return an <code>InetAddress</code> representing the host
1.428 + * IP address.
1.429 + * @since 1.3
1.430 + */
1.431 + protected synchronized InetAddress getHostAddress(URL u) {
1.432 + if (u.hostAddress != null)
1.433 + return u.hostAddress;
1.434 +
1.435 + String host = u.getHost();
1.436 + if (host == null || host.equals("")) {
1.437 + return null;
1.438 + } else {
1.439 + try {
1.440 + u.hostAddress = InetAddress.getByName(host);
1.441 + } catch (UnknownHostException ex) {
1.442 + return null;
1.443 + } catch (SecurityException se) {
1.444 + return null;
1.445 + }
1.446 + }
1.447 + return u.hostAddress;
1.448 + }
1.449 +
1.450 + /**
1.451 + * Compares the host components of two URLs.
1.452 + * @param u1 the URL of the first host to compare
1.453 + * @param u2 the URL of the second host to compare
1.454 + * @return <tt>true</tt> if and only if they
1.455 + * are equal, <tt>false</tt> otherwise.
1.456 + * @since 1.3
1.457 + */
1.458 + protected boolean hostsEqual(URL u1, URL u2) {
1.459 + InetAddress a1 = getHostAddress(u1);
1.460 + InetAddress a2 = getHostAddress(u2);
1.461 + // if we have internet address for both, compare them
1.462 + if (a1 != null && a2 != null) {
1.463 + return a1.equals(a2);
1.464 + // else, if both have host names, compare them
1.465 + } else if (u1.getHost() != null && u2.getHost() != null)
1.466 + return u1.getHost().equalsIgnoreCase(u2.getHost());
1.467 + else
1.468 + return u1.getHost() == null && u2.getHost() == null;
1.469 + }
1.470 +
1.471 + /**
1.472 + * Converts a <code>URL</code> of a specific protocol to a
1.473 + * <code>String</code>.
1.474 + *
1.475 + * @param u the URL.
1.476 + * @return a string representation of the <code>URL</code> argument.
1.477 + */
1.478 + protected String toExternalForm(URL u) {
1.479 +
1.480 + // pre-compute length of StringBuffer
1.481 + int len = u.getProtocol().length() + 1;
1.482 + if (u.getAuthority() != null && u.getAuthority().length() > 0)
1.483 + len += 2 + u.getAuthority().length();
1.484 + if (u.getPath() != null) {
1.485 + len += u.getPath().length();
1.486 + }
1.487 + if (u.getQuery() != null) {
1.488 + len += 1 + u.getQuery().length();
1.489 + }
1.490 + if (u.getRef() != null)
1.491 + len += 1 + u.getRef().length();
1.492 +
1.493 + StringBuffer result = new StringBuffer(len);
1.494 + result.append(u.getProtocol());
1.495 + result.append(":");
1.496 + if (u.getAuthority() != null && u.getAuthority().length() > 0) {
1.497 + result.append("//");
1.498 + result.append(u.getAuthority());
1.499 + }
1.500 + if (u.getPath() != null) {
1.501 + result.append(u.getPath());
1.502 + }
1.503 + if (u.getQuery() != null) {
1.504 + result.append('?');
1.505 + result.append(u.getQuery());
1.506 + }
1.507 + if (u.getRef() != null) {
1.508 + result.append("#");
1.509 + result.append(u.getRef());
1.510 + }
1.511 + return result.toString();
1.512 + }
1.513 +
1.514 + /**
1.515 + * Sets the fields of the <code>URL</code> argument to the indicated values.
1.516 + * Only classes derived from URLStreamHandler are supposed to be able
1.517 + * to call the set method on a URL.
1.518 + *
1.519 + * @param u the URL to modify.
1.520 + * @param protocol the protocol name.
1.521 + * @param host the remote host value for the URL.
1.522 + * @param port the port on the remote machine.
1.523 + * @param authority the authority part for the URL.
1.524 + * @param userInfo the userInfo part of the URL.
1.525 + * @param path the path component of the URL.
1.526 + * @param query the query part for the URL.
1.527 + * @param ref the reference.
1.528 + * @exception SecurityException if the protocol handler of the URL is
1.529 + * different from this one
1.530 + * @see java.net.URL#set(java.lang.String, java.lang.String, int, java.lang.String, java.lang.String)
1.531 + * @since 1.3
1.532 + */
1.533 + protected void setURL(URL u, String protocol, String host, int port,
1.534 + String authority, String userInfo, String path,
1.535 + String query, String ref) {
1.536 + if (this != u.handler) {
1.537 + throw new SecurityException("handler for url different from " +
1.538 + "this handler");
1.539 + }
1.540 + // ensure that no one can reset the protocol on a given URL.
1.541 + u.set(u.getProtocol(), host, port, authority, userInfo, path, query, ref);
1.542 + }
1.543 +
1.544 + /**
1.545 + * Sets the fields of the <code>URL</code> argument to the indicated values.
1.546 + * Only classes derived from URLStreamHandler are supposed to be able
1.547 + * to call the set method on a URL.
1.548 + *
1.549 + * @param u the URL to modify.
1.550 + * @param protocol the protocol name. This value is ignored since 1.2.
1.551 + * @param host the remote host value for the URL.
1.552 + * @param port the port on the remote machine.
1.553 + * @param file the file.
1.554 + * @param ref the reference.
1.555 + * @exception SecurityException if the protocol handler of the URL is
1.556 + * different from this one
1.557 + * @deprecated Use setURL(URL, String, String, int, String, String, String,
1.558 + * String);
1.559 + */
1.560 + @Deprecated
1.561 + protected void setURL(URL u, String protocol, String host, int port,
1.562 + String file, String ref) {
1.563 + /*
1.564 + * Only old URL handlers call this, so assume that the host
1.565 + * field might contain "user:passwd@host". Fix as necessary.
1.566 + */
1.567 + String authority = null;
1.568 + String userInfo = null;
1.569 + if (host != null && host.length() != 0) {
1.570 + authority = (port == -1) ? host : host + ":" + port;
1.571 + int at = host.lastIndexOf('@');
1.572 + if (at != -1) {
1.573 + userInfo = host.substring(0, at);
1.574 + host = host.substring(at+1);
1.575 + }
1.576 + }
1.577 +
1.578 + /*
1.579 + * Assume file might contain query part. Fix as necessary.
1.580 + */
1.581 + String path = null;
1.582 + String query = null;
1.583 + if (file != null) {
1.584 + int q = file.lastIndexOf('?');
1.585 + if (q != -1) {
1.586 + query = file.substring(q+1);
1.587 + path = file.substring(0, q);
1.588 + } else
1.589 + path = file;
1.590 + }
1.591 + setURL(u, protocol, host, port, authority, userInfo, path, query, ref);
1.592 + }
1.593 +}