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*
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* [2002] - [2007] Adobe Systems Incorporated
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* if any. The intellectual and technical concepts contained
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package flex.messaging.services.http.proxy;
import org.apache.commons.httpclient.Cookie;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.StatusLine;
import org.apache.commons.httpclient.HttpMethodBase;
import org.apache.commons.httpclient.methods.OptionsMethod;
import flex.messaging.io.MessageIOConstants;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Enumeration;
import java.util.List;
import flex.messaging.FlexContext;
import flex.messaging.services.HTTPProxyService;
import flex.messaging.log.Log;
/**
* Send the response to the client, including custom copying of headers and cookies
*
* @author Brian Deitte
*/
public class ResponseFilter extends ProxyFilter
{
// NOTE: any changes to this class should also be made to the corresponding version in the .NET.
// The corresponding class is in src/dotNet/libs/FlexASPlib/Aspx/Proxy
public static int RESPONSE_CHUNK = 4096;
private static final int STATUS_ERROR = 10708;
private static final int NULL_RESPONSE_STREAM = 10709;
private static final int CANNOT_STREAM_NOT_HTTP = 10710;
private static final int ERROR_WRITING_RESPONSE = 10711;
public void invoke(ProxyContext context)
{
if (next != null)
{
next.invoke(context);
}
checkStatusCode(context);
copyCookiesFromEndpoint(context);
copyHeadersFromEndpoint(context);
recordResponseHeaders(context);
setupResponse(context);
}
protected void checkStatusCode(ProxyContext context)
{
int statusCode = context.getStatusCode();
if (statusCode >= 400 && statusCode != 401 & statusCode != 403)
{
//FIXME: Why do this only for HTTP Proxy? Why not WebServices?
if (!context.isSoapRequest())
{
StatusLine statusLine = context.getHttpMethod().getStatusLine();
String reason = null;
if (statusLine != null)
{
reason = statusLine.toString();
}
if (reason == null || "".equals(reason))
{
reason = "" + statusCode;
}
ProxyException pe = new ProxyException();
pe.setMessage(STATUS_ERROR, new Object[] { reason });
pe.setCode("Server.Proxy.Request.Failed");
pe.setDetails(STATUS_ERROR, "1", new Object[] { reason });
throw pe;
}
}
}
protected void copyCookiesFromEndpoint(ProxyContext context)
{
HttpServletResponse clientResponse = FlexContext.getHttpResponse();
if (clientResponse != null)
{
Cookie[] cookies = context.getHttpClient().getState().getCookies();
for (int i = 0; i < cookies.length; i++)
{
String domain = cookies[i].getDomain();
String path = cookies[i].getPath();
String name = cookies[i].getName();
String value = cookies[i].getValue();
String clientName = ResponseUtil.getCookieName(context, path, name, domain);
if (Log.isInfo())
{
String str = "-- Cookie in response: domain = '" + domain + "', path = '" + path +
"', client name = '" + clientName + "', endpoint name = '" + name + "', value = '" + value;
Log.getLogger(HTTPProxyService.LOG_CATEGORY).debug(str);
}
javax.servlet.http.Cookie cookie = new javax.servlet.http.Cookie(clientName, value);
Date expiry = cookies[i].getExpiryDate();
if (expiry != null)
{
int maxAge = (int)((expiry.getTime() - System.currentTimeMillis()) / 1000);
cookie.setMaxAge(maxAge);
}
cookie.setSecure(cookies[i].getSecure());
cookie.setPath("/");
clientResponse.addCookie(cookie);
}
}
}
protected void copyHeadersFromEndpoint(ProxyContext context)
{
HttpServletResponse clientResponse = FlexContext.getHttpResponse();
if (clientResponse != null)
{
Header[] headers = context.getHttpMethod().getResponseHeaders();
for (int i = 0; i < headers.length; i++)
{
Header header = headers[i];
String name = header.getName();
String value = header.getValue();
if (ResponseUtil.ignoreHeader(name, context))
{
continue;
}
if ((name != null) && (value != null))
{
clientResponse.addHeader(name, value);
if (Log.isInfo())
{
Log.getLogger(HTTPProxyService.LOG_CATEGORY).debug("-- Header in response: " + name + " : " + value);
}
}
}
// set Pragma needed for ATG on HTTPS
clientResponse.setHeader("Pragma", "public");
}
}
protected void recordResponseHeaders(ProxyContext context)
{
String method = context.getMethod();
if (context.getRecordHeaders() || ProxyConstants.METHOD_HEAD.equals(method))
{
Header[] headers = context.getHttpMethod().getResponseHeaders();
HashMap responseHeaders = new HashMap();
for (int i = 0; i < headers.length; i++)
{
Header header = headers[i];
responseHeaders.put(header.getName(), header.getValue());
}
context.setResponseHeaders(responseHeaders);
}
}
protected void setupResponse(ProxyContext context)
{
String method = context.getMethod();
HttpMethodBase httpMethod = context.getHttpMethod();
if (MessageIOConstants.METHOD_POST.equals(method))
{
writeResponse(context);
}
else if (ProxyConstants.METHOD_GET.equals(method))
{
writeResponse(context);
}
else if (ProxyConstants.METHOD_OPTIONS.equals(method))
{
OptionsMethod optionsMethod = (OptionsMethod)httpMethod;
Enumeration options = optionsMethod.getAllowedMethods();
if (options != null)
{
List ops = new ArrayList();
while (options.hasMoreElements())
{
Object option = options.nextElement();
ops.add(option);
}
Object[] o = ops.toArray();
context.setResponse(o);
}
}
else if (ProxyConstants.METHOD_TRACE.equals(method))
{
writeResponse(context);
}
else if (ProxyConstants.METHOD_DELETE.equals(method))
{
// TODO: QUESTION: Pete For now, do nothing, but note we may need to convert 201, 204,
// and other non-200 responses for flash client...
}
else if (ProxyConstants.METHOD_HEAD.equals(method))
{
context.setResponse(context.getResponseHeaders());
}
else if (ProxyConstants.METHOD_PUT.equals(method))
{
// TODO: QUESTION: Pete For now, do nothing, but note we may need to convert 201, 204,
// and other non-200 responses for flash client...
}
else
{
//ProxyException pe = new ProxyException(INVALID_METHOD);
}
}
protected void writeResponse(ProxyContext context)
{
try
{
InputStream in = context.getHttpMethod().getResponseBodyAsStream();
if (in == null)
{
throw new ProxyException(NULL_RESPONSE_STREAM);
}
int length = (int)context.getHttpMethod().getResponseContentLength();
// Stream response directly to client
if (context.streamResponseToClient())
{
HttpServletResponse clientResponse = FlexContext.getHttpResponse();
if (clientResponse != null)
{
OutputStream out = clientResponse.getOutputStream();
if (length != -1)
{
clientResponse.setContentLength(length);
}
writeStreamedResponse(in, out, context);
}
else
{
throw new ProxyException(CANNOT_STREAM_NOT_HTTP);
}
}
else
{
writeResponseAsString(in, length, context);
}
}
catch (IOException ioe)
{
ProxyException pe = new ProxyException();
pe.setMessage(ERROR_WRITING_RESPONSE, new Object[] { ioe.getMessage() });
throw pe;
}
}
protected void writeStreamedResponse(InputStream inStream, OutputStream out, ProxyContext context) throws IOException
{
byte[] tmp = new byte[RESPONSE_CHUNK];
int i = 0;
while ((i = inStream.read(tmp)) >= 0)
{
out.write(tmp, 0, i);
}
}
protected void writeResponseAsString(InputStream inStream, int length, ProxyContext context)
throws IOException
{
char[] tmp = new char[RESPONSE_CHUNK];
//int i = 0;
StringBuffer sb = new StringBuffer( length < 0 ? 16 : length);
BufferedInputStream bufferedIn = new BufferedInputStream(inStream);
String charset = context.getHttpMethod().getResponseCharSet();
bufferedIn.mark(4);
// Check for BOM as InputStreamReader does not strip BOM in all cases.
boolean hasBOM = false;
int read = bufferedIn.read();
if (read > 0)
{
// UTF-8 BOM is EF BB BF
if (0xEF == (read & 0xFF))
{
read = bufferedIn.read();
if (0xBB == (read & 0xFF))
{
read = bufferedIn.read();
if (0xBF == (read & 0xFF))
{
hasBOM = true;
charset = "UTF-8";
}
}
}
// UTF-16 Little Endian BOM is FF FE
// UTF-32 Little Endian BOM is FF FE 00 00
else if (0xFF == (read & 0xFF))
{
read = bufferedIn.read();
if (0xFE == (read & 0xFF))
{
hasBOM = true;
charset = "UTF16-LE";
// Check two more bytes incase we have UTF-32
bufferedIn.mark(2);
read = bufferedIn.read();
if (0x00 == (read & 0xFF))
{
read = bufferedIn.read();
if (0x00 == (read & 0xFF))
{
charset = "UTF32-LE";
}
else
{
bufferedIn.reset();
}
}
else
{
bufferedIn.reset();
}
}
}
// UTF-16 Big Endian BOM is FE FF
else if (0xFE == (read & 0xFF))
{
read = bufferedIn.read();
if (0xFF == (read & 0xFF))
{
hasBOM = true;
charset = "UTF16-BE";
}
}
// UTF-32 Big Endian BOM is 00 00 FE FF
else if (0x00 == (read & 0xFF))
{
read = bufferedIn.read();
if (0x00 == (read & 0xFF))
{
read = bufferedIn.read();
if (0xFE == (read & 0xFF))
{
read = bufferedIn.read();
if (0xFF == (read & 0xFF))
{
hasBOM = true;
charset = "UTF32-BE";
}
}
}
}
// If we didn't find a BOM, all bytes should contribute to the content
if (!hasBOM)
bufferedIn.reset();
}
BufferedReader reader = new BufferedReader(new InputStreamReader(bufferedIn, charset));
int charactersRead = -1;
while ((charactersRead = reader.read(tmp, 0, tmp.length)) >= 0)
{
sb.append(new String(tmp, 0, charactersRead));
}
context.setResponse(sb.toString());
}
}