コード例 #1
0
  /**
   * Attempts to send an internal server error HTTP error, if possible. Otherwise simply pushes the
   * exception message to the output stream.
   *
   * @param message Message to be printed to the logger and to the output stream.
   * @param t Exception that caused the error.
   */
  protected void filterError(String message, Throwable t) {
    log.error("XSLT filter error: " + message, t);
    if (false == origResponse.isCommitted()) {
      // Reset the buffer and previous status code.
      origResponse.reset();
      origResponse.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
      origResponse.setContentType("text/html; charset=UTF-8");
    }

    // Response committed. Just push the error to the output stream.
    try {
      final OutputStream os = origResponse.getOutputStream();
      final PrintWriter osw = new PrintWriter(new OutputStreamWriter(os, "iso8859-1"));
      osw.write("<html><body><!-- " + XSLTFilterConstants.ERROR_TOKEN + " -->");
      osw.write("<h1 style=\"color: red; margin-top: 1em;\">");
      osw.write("Internal server exception");
      osw.write("</h1>");
      osw.write("<b>URI</b>: " + origRequest.getRequestURI() + "\n<br/><br/>");
      serializeException(osw, t);
      if (t instanceof ServletException && ((ServletException) t).getRootCause() != null) {
        osw.write("<br/><br/><h2>ServletException root cause:</h2>");
        serializeException(osw, ((ServletException) t).getRootCause());
      }
      osw.write("</body></html>");
      osw.flush();
    } catch (IOException e) {
      // Not much to do in such case (connection broken most likely).
      log.debug("Filter error could not be returned to client.");
    }
  }
コード例 #2
0
  /**
   * Return the character output stream for this response. This is either the original stream or a
   * buffered stream.
   *
   * @exception IllegalStateException Thrown when byte stream has been already initialized ({@link
   *     #getOutputStream()}).
   */
  public PrintWriter getWriter() throws IOException {
    if (stream != null) {
      throw new IllegalStateException(
          "Byte stream has been already initialized. Use streams consequently.");
    }

    if (writer != null) {
      return writer;
    }

    if (passthrough) {
      writer = this.origResponse.getWriter();
      return writer;
    }

    /*
     * TODO: The character encoding should be extracted in {@link #setContentType()},
     * saved somewhere locally and used here. The response's character encoding may be
     * different (depends on the stylesheet).
     */
    final String charEnc = origResponse.getCharacterEncoding();

    this.stream = new DeferredOutputStream();
    if (charEnc != null) {
      writer = new PrintWriter(new OutputStreamWriter(stream, charEnc));
    } else {
      writer = new PrintWriter(stream);
    }

    return writer;
  }
コード例 #3
0
  /** We override this method to detect XML data streams. */
  public void setContentType(String contentType) {
    // Check if XSLT processing has been suppressed for this request.
    final boolean processingSuppressed = processingSuppressed(origRequest);

    if (processingSuppressed) {
      // Processing is suppressed.
      log.debug("XSLT processing disabled for the request.");
    }

    if (!processingSuppressed
        && (contentType.startsWith("text/xml") || contentType.startsWith("application/xml"))) {
      /*
       * We have an XML data stream. Set the real response to proper content type.
       * TODO: Should we make the encoding a configurable setting?
       */
      origResponse.setContentType("text/html; charset=UTF-8");
    } else {
      /*
       * The input is something we won't process anyway, so simply passthrough all
       * data directly to the output stream.
       */
      if (!processingSuppressed) {
        log.info(
            "Content type is not text/xml or application/xml (" + contentType + "), passthrough.");
      }

      origResponse.setContentType(contentType);
      passthrough = true;

      // If the output stream is already initialized, passthrough everything.
      if (stream != null && stream instanceof DeferredOutputStream) {
        try {
          ((DeferredOutputStream) stream).passthrough(origResponse.getOutputStream());
        } catch (IOException e) {
          ((DeferredOutputStream) stream).setExceptionOnNext(e);
        }
      }
    }
  }
コード例 #4
0
  /**
   * Return the byte output stream for this response. This is either the original stream or a
   * buffered stream.
   *
   * @exception IllegalStateException Thrown when character stream has been already initialized
   *     ({@link #getWriter()}).
   */
  public ServletOutputStream getOutputStream() throws IOException {
    if (writer != null) {
      throw new IllegalStateException(
          "Character stream has been already initialized. Use streams consequently.");
    }

    if (stream != null) {
      return stream;
    }

    if (passthrough) {
      stream = origResponse.getOutputStream();
    } else {
      stream = new DeferredOutputStream();
    }

    return stream;
  }
コード例 #5
0
  /**
   * This method must be invoked at the end of processing. The streams are closed and their content
   * is analyzed. Actual XSLT processing takes place here.
   */
  @SuppressWarnings("unchecked")
  void finishResponse() throws IOException {
    if (writer != null) {
      writer.close();
    } else {
      if (stream != null) stream.close();
    }

    /*
     * If we're not in passthrough mode, then we need to finalize XSLT transformation.
     */
    if (false == passthrough) {
      if (stream != null) {
        final byte[] bytes = ((DeferredOutputStream) stream).getBytes();
        final boolean processingSuppressed =
            (origRequest.getAttribute(XSLTFilterConstants.NO_XSLT_PROCESSING) != null)
                | (origRequest.getParameter(XSLTFilterConstants.NO_XSLT_PROCESSING) != null);

        if (processingSuppressed) {
          // Just copy the buffered data to the output directly.
          final OutputStream os = origResponse.getOutputStream();
          os.write(bytes);
          os.close();
        } else {
          // Otherwise apply XSLT transformation to it.
          try {
            processWithXslt(
                bytes,
                (Map<String, Object>) origRequest.getAttribute(XSLTFilterConstants.XSLT_PARAMS_MAP),
                origResponse);
          } catch (TransformerException e) {
            final Throwable t = unwrapCause(e);
            if (t instanceof IOException) {
              throw (IOException) t;
            }

            filterError("Error applying stylesheet.", e);
          }
        }
      }
    }
  }