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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/net/HttpURLConnection.java
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+/* HttpURLConnection.java -- Subclass of communications links using
+ Hypertext Transfer Protocol.
+ Copyright (C) 1998, 1999, 2000, 2002, 2003 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+package java.net;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.PushbackInputStream;
+import java.security.Permission;
+
+
+/*
+ * Written using on-line Java Platform 1.2 API Specification, as well
+ * as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998).
+ * Status: Believed complete and correct.
+ */
+
+/**
+ * This class provides a common abstract implementation for those
+ * URL connection classes that will connect using the HTTP protocol.
+ * In addition to the functionality provided by the URLConnection
+ * class, it defines constants for HTTP return code values and
+ * methods for setting the HTTP request method and determining whether
+ * or not to follow redirects.
+ *
+ * @since 1.1
+ *
+ * @author Warren Levy (warrenl@cygnus.com)
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ */
+public abstract class HttpURLConnection extends URLConnection
+{
+ /* HTTP Success Response Codes */
+
+ /**
+ * Indicates that the client may continue with its request. This value
+ * is specified as part of RFC 2068 but was not included in Sun's JDK, so
+ * beware of using this value
+ */
+ static final int HTTP_CONTINUE = 100;
+
+ /**
+ * Indicates the request succeeded.
+ */
+ public static final int HTTP_OK = 200;
+
+ /**
+ * The requested resource has been created.
+ */
+ public static final int HTTP_CREATED = 201;
+
+ /**
+ * The request has been accepted for processing but has not completed.
+ * There is no guarantee that the requested action will actually ever
+ * be completed succesfully, but everything is ok so far.
+ */
+ public static final int HTTP_ACCEPTED = 202;
+
+ /**
+ * The meta-information returned in the header is not the actual data
+ * from the original server, but may be from a local or other copy.
+ * Normally this still indicates a successful completion.
+ */
+ public static final int HTTP_NOT_AUTHORITATIVE = 203;
+
+ /**
+ * The server performed the request, but there is no data to send
+ * back. This indicates that the user's display should not be changed.
+ */
+ public static final int HTTP_NO_CONTENT = 204;
+
+ /**
+ * The server performed the request, but there is no data to sent back,
+ * however, the user's display should be "reset" to clear out any form
+ * fields entered.
+ */
+ public static final int HTTP_RESET = 205;
+
+ /**
+ * The server completed the partial GET request for the resource.
+ */
+ public static final int HTTP_PARTIAL = 206;
+
+ /* HTTP Redirection Response Codes */
+
+ /**
+ * There is a list of choices available for the requested resource.
+ */
+ public static final int HTTP_MULT_CHOICE = 300;
+
+ /**
+ * The resource has been permanently moved to a new location.
+ */
+ public static final int HTTP_MOVED_PERM = 301;
+
+ /**
+ * The resource requested has been temporarily moved to a new location.
+ */
+ public static final int HTTP_MOVED_TEMP = 302;
+
+ /**
+ * The response to the request issued is available at another location.
+ */
+ public static final int HTTP_SEE_OTHER = 303;
+
+ /**
+ * The document has not been modified since the criteria specified in
+ * a conditional GET.
+ */
+ public static final int HTTP_NOT_MODIFIED = 304;
+
+ /**
+ * The requested resource needs to be accessed through a proxy.
+ */
+ public static final int HTTP_USE_PROXY = 305;
+
+ /* HTTP Client Error Response Codes */
+
+ /**
+ * The request was misformed or could not be understood.
+ */
+ public static final int HTTP_BAD_REQUEST = 400;
+
+ /**
+ * The request made requires user authorization. Try again with
+ * a correct authentication header.
+ */
+ public static final int HTTP_UNAUTHORIZED = 401;
+
+ /**
+ * Code reserved for future use - I hope way in the future.
+ */
+ public static final int HTTP_PAYMENT_REQUIRED = 402;
+
+ /**
+ * There is no permission to access the requested resource.
+ */
+ public static final int HTTP_FORBIDDEN = 403;
+
+ /**
+ * The requested resource was not found.
+ */
+ public static final int HTTP_NOT_FOUND = 404;
+
+ /**
+ * The specified request method is not allowed for this resource.
+ */
+ public static final int HTTP_BAD_METHOD = 405;
+
+ /**
+ * Based on the input headers sent, the resource returned in response
+ * to the request would not be acceptable to the client.
+ */
+ public static final int HTTP_NOT_ACCEPTABLE = 406;
+
+ /**
+ * The client must authenticate with a proxy prior to attempting this
+ * request.
+ */
+ public static final int HTTP_PROXY_AUTH = 407;
+
+ /**
+ * The request timed out.
+ */
+ public static final int HTTP_CLIENT_TIMEOUT = 408;
+
+ /**
+ * There is a conflict between the current state of the resource and the
+ * requested action.
+ */
+ public static final int HTTP_CONFLICT = 409;
+
+ /**
+ * The requested resource is no longer available. This ususally indicates
+ * a permanent condition.
+ */
+ public static final int HTTP_GONE = 410;
+
+ /**
+ * A Content-Length header is required for this request, but was not
+ * supplied.
+ */
+ public static final int HTTP_LENGTH_REQUIRED = 411;
+
+ /**
+ * A client specified pre-condition was not met on the server.
+ */
+ public static final int HTTP_PRECON_FAILED = 412;
+
+ /**
+ * The request sent was too large for the server to handle.
+ */
+ public static final int HTTP_ENTITY_TOO_LARGE = 413;
+
+ /**
+ * The name of the resource specified was too long.
+ */
+ public static final int HTTP_REQ_TOO_LONG = 414;
+
+ /**
+ * The request is in a format not supported by the requested resource.
+ */
+ public static final int HTTP_UNSUPPORTED_TYPE = 415;
+
+ /* HTTP Server Error Response Codes */
+
+ /**
+ * This error code indicates that some sort of server error occurred.
+ *
+ * @deprecated
+ */
+ public static final int HTTP_SERVER_ERROR = 500;
+
+ /**
+ * The server encountered an unexpected error (such as a CGI script crash)
+ * that prevents the request from being fulfilled.
+ */
+ public static final int HTTP_INTERNAL_ERROR = 500;
+
+ /**
+ * The server does not support the requested functionality.
+ * @since 1.3
+ */
+ public static final int HTTP_NOT_IMPLEMENTED = 501;
+
+ /**
+ * The proxy encountered a bad response from the server it was proxy-ing for
+ */
+ public static final int HTTP_BAD_GATEWAY = 502;
+
+ /**
+ * The HTTP service is not availalble, such as because it is overloaded
+ * and does not want additional requests.
+ */
+ public static final int HTTP_UNAVAILABLE = 503;
+
+ /**
+ * The proxy timed out getting a reply from the remote server it was
+ * proxy-ing for.
+ */
+ public static final int HTTP_GATEWAY_TIMEOUT = 504;
+
+ /**
+ * This server does not support the protocol version requested.
+ */
+ public static final int HTTP_VERSION = 505;
+
+ // Non-HTTP response static variables
+
+ /**
+ * Flag to indicate whether or not redirects should be automatically
+ * followed by default.
+ */
+ private static boolean followRedirects = true;
+
+ /**
+ * This is a list of valid request methods, separated by "|" characters.
+ */
+ private static final String valid_methods =
+ "|GET|POST|HEAD|OPTIONS|PUT|DELETE|TRACE|";
+
+ // Instance Variables
+
+ /**
+ * The requested method in use for this connection. Default is GET.
+ */
+ protected String method = "GET";
+
+ /**
+ * The response code received from the server
+ */
+ protected int responseCode = -1;
+
+ /**
+ * The response message string received from the server.
+ */
+ protected String responseMessage;
+
+ /**
+ * If this instance should follow redirect requests.
+ */
+ protected boolean instanceFollowRedirects = followRedirects;
+
+ /**
+ * Whether we already got a valid response code for this connection.
+ * Used by <code>getResponseCode()</code> and
+ * <code>getResponseMessage()</code>.
+ */
+ private boolean gotResponseVals;
+
+ /**
+ * Create an HttpURLConnection for the specified URL
+ *
+ * @param url The URL to create this connection for.
+ */
+ protected HttpURLConnection(URL url)
+ {
+ super(url);
+ }
+
+ /**
+ * Closes the connection to the server.
+ */
+ public abstract void disconnect();
+
+ /**
+ * Returns a boolean indicating whether or not this connection is going
+ * through a proxy
+ *
+ * @return true if through a proxy, false otherwise
+ */
+ public abstract boolean usingProxy();
+
+ /**
+ * Sets whether HTTP redirects (requests with response code 3xx) should be
+ * automatically followed by this class. True by default
+ *
+ * @param set true if redirects should be followed, false otherwis.
+ *
+ * @exception SecurityException If a security manager exists and its
+ * checkSetFactory method doesn't allow the operation
+ */
+ public static void setFollowRedirects(boolean set)
+ {
+ // Throw an exception if an extant security mgr precludes
+ // setting the factory.
+ SecurityManager s = System.getSecurityManager();
+ if (s != null)
+ s.checkSetFactory();
+
+ followRedirects = set;
+ }
+
+ /**
+ * Returns a boolean indicating whether or not HTTP redirects will
+ * automatically be followed or not.
+ *
+ * @return true if redirects will be followed, false otherwise
+ */
+ public static boolean getFollowRedirects()
+ {
+ return followRedirects;
+ }
+
+ /**
+ * Returns the value of this HttpURLConnection's instanceFollowRedirects
+ * field
+ *
+ * @return true if following redirects is enabled, false otherwise
+ */
+ public boolean getInstanceFollowRedirects()
+ {
+ return instanceFollowRedirects;
+ }
+
+ /**
+ * Sets the value of this HttpURLConnection's instanceFollowRedirects field
+ *
+ * @param follow true to enable following redirects, false otherwise
+ */
+ public void setInstanceFollowRedirects(boolean follow)
+ {
+ instanceFollowRedirects = follow;
+ }
+
+ /**
+ * Set the method for the URL request, one of:
+ * GET POST HEAD OPTIONS PUT DELETE TRACE are legal
+ *
+ * @param method the method to use
+ *
+ * @exception ProtocolException If the method cannot be reset or if the
+ * requested method isn't valid for HTTP
+ */
+ public void setRequestMethod(String method) throws ProtocolException
+ {
+ if (connected)
+ throw new ProtocolException("Already connected");
+
+ method = method.toUpperCase();
+ if (valid_methods.indexOf("|" + method + "|") != -1)
+ this.method = method;
+ else
+ throw new ProtocolException("Invalid HTTP request method: " + method);
+ }
+
+ /**
+ * The request method currently in use for this connection.
+ *
+ * @return The request method
+ */
+ public String getRequestMethod()
+ {
+ return method;
+ }
+
+ /**
+ * Gets the status code from an HTTP response message, or -1 if
+ * the response code could not be determined.
+ * Note that all valid response codes have class variables
+ * defined for them in this class.
+ *
+ * @return The response code
+ *
+ * @exception IOException If an error occurs
+ */
+ public int getResponseCode() throws IOException
+ {
+ if (! gotResponseVals)
+ getResponseVals();
+ return responseCode;
+ }
+
+ /**
+ * Gets the HTTP response message, if any, returned along with the
+ * response code from a server. Null if no response message was set
+ * or an error occured while connecting.
+ *
+ * @return The response message
+ *
+ * @exception IOException If an error occurs
+ */
+ public String getResponseMessage() throws IOException
+ {
+ if (! gotResponseVals)
+ getResponseVals();
+ return responseMessage;
+ }
+
+ private void getResponseVals() throws IOException
+ {
+ // getHeaderField() will connect for us, but do it here first in
+ // order to pick up IOExceptions.
+ if (! connected)
+ connect();
+
+ gotResponseVals = true;
+
+ // If responseCode not yet explicitly set by subclass
+ if (responseCode == -1)
+ {
+ // Response is the first header received from the connection.
+ String respField = getHeaderField(0);
+
+ if (respField == null || ! respField.startsWith("HTTP/"))
+ {
+ // Set to default values on failure.
+ responseCode = -1;
+ responseMessage = null;
+ return;
+ }
+
+ int firstSpc;
+ int nextSpc;
+ firstSpc = respField.indexOf(' ');
+ nextSpc = respField.indexOf(' ', firstSpc + 1);
+ responseMessage = respField.substring(nextSpc + 1);
+ String codeStr = respField.substring(firstSpc + 1, nextSpc);
+ try
+ {
+ responseCode = Integer.parseInt(codeStr);
+ }
+ catch (NumberFormatException e)
+ {
+ // Set to default values on failure.
+ responseCode = -1;
+ responseMessage = null;
+ }
+ }
+ }
+
+ /**
+ * Returns a permission object representing the permission necessary to make
+ * the connection represented by this object
+ *
+ * @return the permission necessary for this connection
+ *
+ * @exception IOException If an error occurs
+ */
+ public Permission getPermission() throws IOException
+ {
+ URL url = getURL();
+ String host = url.getHost();
+ int port = url.getPort();
+ if (port == -1)
+ port = 80;
+
+ host = host + ":" + port;
+
+ return new SocketPermission(host, "connect");
+ }
+
+ /**
+ * This method allows the caller to retrieve any data that might have
+ * been sent despite the fact that an error occurred. For example, the
+ * HTML page sent along with a 404 File Not Found error. If the socket
+ * is not connected, or if no error occurred or no data was returned,
+ * this method returns <code>null</code>.
+ *
+ * @return An <code>InputStream</code> for reading error data.
+ */
+ public InputStream getErrorStream()
+ {
+ if (! connected)
+ return null;
+
+ int code;
+ try
+ {
+ code = getResponseCode();
+ }
+ catch (IOException e)
+ {
+ code = -1;
+ }
+
+ if (code == -1)
+ return null;
+
+ if (((code / 100) != 4) || ((code / 100) != 5))
+ return null;
+
+ try
+ {
+ PushbackInputStream pbis = new PushbackInputStream(getInputStream());
+
+ int i = pbis.read();
+ if (i == -1)
+ return null;
+
+ pbis.unread(i);
+ return pbis;
+ }
+ catch (IOException e)
+ {
+ return null;
+ }
+ }
+
+ /**
+ * Returns the value of the named field parsed as date
+ *
+ * @param key the key of the header field
+ * @param value the default value if the header field is not present
+ *
+ * @return the value of the header field
+ */
+ public long getHeaderFieldDate(String key, long value)
+ {
+ // FIXME: implement this correctly
+ // http://www.w3.org/Protocols/HTTP-NG/ng-notes.txt
+ return super.getHeaderFieldDate(key, value);
+ }
+}