| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 in the LICENSE file that |
| * accompanied this code). |
| * |
| * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.net; |
| |
| import java.io.IOException; |
| import java.util.Objects; |
| |
| import sun.net.util.IPAddressUtil; |
| |
| /** |
| * The abstract class {@code URLStreamHandler} 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} or {@code https}. |
| * <p> |
| * In most cases, an instance of a {@code URLStreamHandler} |
| * subclass is not created directly by an application. Rather, the |
| * first time a protocol name is encountered when constructing a |
| * {@code URL}, the appropriate stream protocol handler is |
| * automatically loaded. |
| * |
| * @author James Gosling |
| * @see java.net.URL#URL(java.lang.String, java.lang.String, int, java.lang.String) |
| * @since JDK1.0 |
| */ |
| public abstract class URLStreamHandler { |
| /** |
| * Opens a connection to the object referenced by the |
| * {@code URL} argument. |
| * This method should be overridden by a subclass. |
| * |
| * <p>If for the handler's protocol (such as HTTP or JAR), there |
| * exists a public, specialized URLConnection subclass belonging |
| * to one of the following packages or one of their subpackages: |
| * java.lang, java.io, java.util, java.net, the connection |
| * returned will be of that subclass. For example, for HTTP an |
| * HttpURLConnection will be returned, and for JAR a |
| * JarURLConnection will be returned. |
| * |
| * @param u the URL that this connects to. |
| * @return a {@code URLConnection} object for the {@code URL}. |
| * @exception IOException if an I/O error occurs while opening the |
| * connection. |
| */ |
| abstract protected URLConnection openConnection(URL u) throws IOException; |
| |
| /** |
| * Same as openConnection(URL), except that the connection will be |
| * made through the specified proxy; Protocol handlers that do not |
| * support proxying will ignore the proxy parameter and make a |
| * normal connection. |
| * |
| * Calling this method preempts the system's default ProxySelector |
| * settings. |
| * |
| * @param u the URL that this connects to. |
| * @param p the proxy through which the connection will be made. |
| * If direct connection is desired, Proxy.NO_PROXY |
| * should be specified. |
| * @return a {@code URLConnection} object for the {@code URL}. |
| * @exception IOException if an I/O error occurs while opening the |
| * connection. |
| * @exception IllegalArgumentException if either u or p is null, |
| * or p has the wrong type. |
| * @exception UnsupportedOperationException if the subclass that |
| * implements the protocol doesn't support this method. |
| * @since 1.5 |
| */ |
| protected URLConnection openConnection(URL u, Proxy p) throws IOException { |
| throw new UnsupportedOperationException("Method not implemented."); |
| } |
| |
| /** |
| * Parses the string representation of a {@code URL} into a |
| * {@code URL} object. |
| * <p> |
| * If there is any inherited context, then it has already been |
| * copied into the {@code URL} argument. |
| * <p> |
| * The {@code parseURL} method of {@code URLStreamHandler} |
| * parses the string representation as if it were an |
| * {@code http} 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} to receive the result of parsing |
| * the spec. |
| * @param spec the {@code String} representing the URL that |
| * must be parsed. |
| * @param start the character index at which to begin parsing. This is |
| * just past the '{@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 #}" character, if present. All information |
| * after the sharp sign indicates an anchor. |
| */ |
| 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; |
| // BEGIN Android-changed |
| boolean querySet = false; |
| // END Android-changed |
| |
| // 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); |
| // BEGIN Android-changed |
| querySet = true; |
| // END Android-changed |
| } |
| } |
| |
| int i = 0; |
| // Parse the authority part if any |
| // BEGIN Android-changed |
| // boolean isUNCName = (start <= limit - 4) && |
| // (spec.charAt(start) == '/') && |
| // (spec.charAt(start + 1) == '/') && |
| // (spec.charAt(start + 2) == '/') && |
| // (spec.charAt(start + 3) == '/'); |
| boolean isUNCName = false; |
| // END Android-changed |
| if (!isUNCName && (start <= limit - 2) && (spec.charAt(start) == '/') && |
| (spec.charAt(start + 1) == '/')) { |
| start += 2; |
| i = spec.indexOf('/', start); |
| if (i < 0 || i > limit) { |
| i = spec.indexOf('?', start); |
| if (i < 0 || i > limit) |
| i = limit; |
| } |
| |
| host = authority = spec.substring(start, i); |
| |
| int ind = authority.indexOf('@'); |
| if (ind != -1) { |
| if (ind != authority.lastIndexOf('@')) { |
| // more than one '@' in authority. This is not server based |
| userInfo = null; |
| host = null; |
| } else { |
| 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) == '[')) { |
| if ((ind = host.indexOf(']')) > 2) { |
| |
| String nhost = host ; |
| host = nhost.substring(0,ind+1); |
| if (!IPAddressUtil. |
| isIPv6LiteralAddress(host.substring(1, ind))) { |
| throw new IllegalArgumentException( |
| "Invalid host: "+ host); |
| } |
| |
| 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)) { |
| // BEGIN Android-changed |
| // port = Integer.parseInt(host.substring(ind + 1)); |
| char firstPortChar = host.charAt(ind+1); |
| if (firstPortChar >= '0' && firstPortChar <= '9') { |
| port = Integer.parseInt(host.substring(ind + 1)); |
| } else { |
| throw new IllegalArgumentException("invalid port: " + |
| host.substring(ind + 1)); |
| } |
| // END Android-changed |
| } |
| host = host.substring(0, ind); |
| } |
| } |
| } else { |
| host = ""; |
| } |
| if (port < -1) |
| throw new IllegalArgumentException("Invalid port number :" + |
| port); |
| start = i; |
| |
| // BEGIN Android-changed |
| // 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 = ""; |
| path = null; |
| if (!querySet) { |
| query = null; |
| } |
| // END Android-changed |
| } |
| |
| 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); |
| } |
| } |
| // BEGIN Android-changed |
| //else if (queryOnly && path != null) { |
| // int ind = path.lastIndexOf('/'); |
| // if (ind < 0) |
| // ind = 0; |
| // path = path.substring(0, ind) + "/"; |
| //} |
| // END Android-changed |
| if (path == null) |
| path = ""; |
| |
| // BEGIN Android-changed |
| //if (isRelPath) { |
| if (true) { |
| // END Android-changed |
| // 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) { |
| // BEGIN Android-changed |
| /* |
| * Trailing /../ |
| */ |
| if (i == 0) { |
| path = path.substring(i + 3); |
| i = 0; |
| // END Android-changed |
| /* |
| * 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 |
| */ |
| } else 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; |
| } |
| } |
| // Remove starting . |
| if (path.startsWith("./") && path.length() > 2) |
| path = path.substring(2); |
| |
| // Remove trailing . |
| if (path.endsWith("/.")) |
| path = path.substring(0, path.length() -1); |
| |
| // Remove trailing ? |
| if (path.endsWith("?")) |
| path = path.substring(0, path.length() -1); |
| } |
| |
| setURL(u, protocol, host, port, authority, userInfo, path, query, ref); |
| } |
| |
| /** |
| * Returns the default port for a URL parsed by this handler. This method |
| * is meant to be overidden by handlers with default port numbers. |
| * @return the default port for a {@code URL} parsed by this handler. |
| * @since 1.3 |
| */ |
| protected int getDefaultPort() { |
| return -1; |
| } |
| |
| /** |
| * Provides the default equals calculation. May be overidden by handlers |
| * for other protocols that have different requirements for equals(). |
| * This method requires that none of its arguments is null. This is |
| * guaranteed by the fact that it is only called by java.net.URL class. |
| * @param u1 a URL object |
| * @param u2 a URL object |
| * @return {@code true} if the two urls are |
| * considered equal, ie. they refer to the same |
| * fragment in the same file. |
| * @since 1.3 |
| */ |
| protected boolean equals(URL u1, URL u2) { |
| return Objects.equals(u1.getRef(), u2.getRef()) && |
| Objects.equals(u1.getQuery(), u2.getQuery()) && |
| // sameFile compares the protocol, file, port & host components of |
| // the URLs. |
| sameFile(u1, u2); |
| } |
| |
| /** |
| * Provides the default hash calculation. May be overidden by handlers for |
| * other protocols that have different requirements for hashCode |
| * calculation. |
| * @param u a URL object |
| * @return an {@code int} suitable for hash table indexing |
| * @since 1.3 |
| */ |
| protected int hashCode(URL u) { |
| // Hash on the same set of fields that we compare in equals(). |
| return Objects.hash( |
| u.getRef(), |
| u.getQuery(), |
| u.getProtocol(), |
| u.getFile(), |
| u.getHost(), |
| u.getPort()); |
| } |
| |
| /** |
| * Compare two urls to see whether they refer to the same file, |
| * i.e., having the same protocol, host, port, and path. |
| * This method requires that none of its arguments is null. This is |
| * guaranteed by the fact that it is only called indirectly |
| * by java.net.URL class. |
| * @param u1 a URL object |
| * @param u2 a URL object |
| * @return true if u1 and u2 refer to the same file |
| * @since 1.3 |
| */ |
| 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; |
| } |
| |
| /** |
| * Get the IP address of our host. An empty host field or a DNS failure |
| * will result in a null return. |
| * |
| * @param u a URL object |
| * @return an {@code InetAddress} representing the host |
| * IP address. |
| * @since 1.3 |
| */ |
| 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; |
| } |
| |
| /** |
| * Compares the host components of two URLs. |
| * @param u1 the URL of the first host to compare |
| * @param u2 the URL of the second host to compare |
| * @return {@code true} if and only if they |
| * are equal, {@code false} otherwise. |
| * @since 1.3 |
| */ |
| protected boolean hostsEqual(URL u1, URL u2) { |
| // Android-changed: Don't compare the InetAddresses of the hosts. |
| if (u1.getHost() != null && u2.getHost() != null) |
| return u1.getHost().equalsIgnoreCase(u2.getHost()); |
| else |
| return u1.getHost() == null && u2.getHost() == null; |
| } |
| |
| /** |
| * Converts a {@code URL} of a specific protocol to a |
| * {@code String}. |
| * |
| * @param u the URL. |
| * @return a string representation of the {@code URL} argument. |
| */ |
| 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(); |
| |
| StringBuilder result = new StringBuilder(len); |
| result.append(u.getProtocol()); |
| result.append(":"); |
| if (u.getAuthority() != null) {// ANDROID: && u.getAuthority().length() > 0) { |
| result.append("//"); |
| result.append(u.getAuthority()); |
| } |
| String fileAndQuery = u.getFile(); |
| if (fileAndQuery != null) { |
| result.append(fileAndQuery); |
| } |
| if (u.getRef() != null) { |
| result.append("#"); |
| result.append(u.getRef()); |
| } |
| return result.toString(); |
| } |
| |
| /** |
| * Sets the fields of the {@code URL} argument to the indicated values. |
| * Only classes derived from URLStreamHandler are able |
| * to use this method to set the values of the URL fields. |
| * |
| * @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) |
| * @since 1.3 |
| */ |
| 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); |
| } |
| |
| /** |
| * Sets the fields of the {@code URL} argument to the indicated values. |
| * Only classes derived from URLStreamHandler are able |
| * to use this method to set the values of the URL fields. |
| * |
| * @param u the URL to modify. |
| * @param protocol the protocol name. This value is ignored since 1.2. |
| * @param host the remote host value for the URL. |
| * @param port the port on the remote machine. |
| * @param file the file. |
| * @param ref the reference. |
| * @exception SecurityException if the protocol handler of the URL is |
| * different from this one |
| * @deprecated Use setURL(URL, String, String, int, String, String, String, |
| * String); |
| */ |
| @Deprecated |
| protected void setURL(URL u, String protocol, String host, int port, |
| String file, String ref) { |
| /* |
| * Only old URL handlers call this, so assume that the host |
| * field might contain "user:passwd@host". Fix as necessary. |
| */ |
| 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); |
| } |
| } |
| |
| /* |
| * Assume file might contain query part. Fix as necessary. |
| */ |
| 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); |
| } |
| } |
