Package com.google.gwt.user.server.rpc

Class RPCServletUtils

java.lang.Object
com.google.gwt.user.server.rpc.RPCServletUtils
public class RPCServletUtils extends Object
Utility class containing helper methods used by servlets that integrate with the RPC system.

  • Field Details

  • Method Details

    • acceptsGzipEncoding

      public static boolean acceptsGzipEncoding(javax.servlet.http.HttpServletRequest request)
      Returns true if the HttpServletRequest accepts Gzip encoding. This is done by checking that the accept-encoding header specifies gzip as a supported encoding.
      Parameters:
      request - the request instance to test for gzip encoding acceptance
      Returns:
      true if the HttpServletRequest accepts Gzip encoding

    • exceedsUncompressedContentLengthLimit

      public static boolean exceedsUncompressedContentLengthLimit(String content)
      Returns true if the response content's estimated UTF-8 byte length exceeds 256 bytes.
      Parameters:
      content - the contents of the response
      Returns:
      true if the response content's estimated UTF-8 byte length exceeds 256 bytes

    • getCharset

      public static Charset getCharset(String encoding)
      Get the Charset for a named character set. Caches Charsets to work around a concurrency bottleneck in FastCharsetProvider. See http://code.google.com/p/google-web-toolkit/issues/detail?id=6398
      Parameters:
      encoding - the name of the Charset to get. If this is null the default UTF-8 character set will be returned.
      Returns:
      the named Charset.

    • isExpectedException

      public static boolean isExpectedException(Method serviceIntfMethod, Throwable cause)
      Returns true if the Method definition on the service is specified to throw the exception contained in the InvocationTargetException or false otherwise. NOTE we do not check that the type is serializable here. We assume that it must be otherwise the application would never have been allowed to run.
      Parameters:
      serviceIntfMethod - the method from the RPC request
      cause - the exception that the method threw
      Returns:
      true if the exception's type is in the method's signature

    • readContent

      public static String readContent(javax.servlet.http.HttpServletRequest request, String expectedContentType, String expectedCharSet) throws IOException, javax.servlet.ServletException
      Returns the content of an HttpServletRequest by decoding it using expectedCharSet, or UTF-8 if expectedCharSet is null.
      Parameters:
      request - the servlet request whose content we want to read
      expectedContentType - the expected content (i.e. 'type/subtype' only) in the Content-Type request header, or null if no validation is to be performed, and you are willing to allow for some types of cross type security attacks
      expectedCharSet - the expected request charset, or null if no charset validation is to be performed and UTF-8 should be assumed
      Returns:
      the content of an HttpServletRequest by decoding it using expectedCharSet, or UTF-8 if expectedCharSet is null
      Throws:
      IOException - if the request's input stream cannot be accessed, read from or closed
      javax.servlet.ServletException - if the request's content type does not equal the supplied expectedContentType or expectedCharSet

    • readContentAsGwtRpc

      public static String readContentAsGwtRpc(javax.servlet.http.HttpServletRequest request) throws IOException, javax.servlet.ServletException
      Returns the content of an HttpServletRequest, after verifying a gwt/x-gwt-rpc; charset=utf-8 content type.
      Parameters:
      request - the servlet request whose content we want to read
      Returns:
      the content of an HttpServletRequest by decoding it using UTF-8
      Throws:
      IOException - if the request's input stream cannot be accessed, read from or closed
      javax.servlet.ServletException - if the request's content type is not gwt/x-gwt-rpc; charset=utf-8, ignoring case

    • readContentAsUtf8

      @Deprecated public static String readContentAsUtf8(javax.servlet.http.HttpServletRequest request) throws IOException, javax.servlet.ServletException
      Deprecated.
      Use readContent(javax.servlet.http.HttpServletRequest, java.lang.String, java.lang.String) instead.
      Returns the content of an HttpServletRequest by decoding it using the UTF-8 charset.
      Parameters:
      request - the servlet request whose content we want to read
      Returns:
      the content of an HttpServletRequest by decoding it using the UTF-8 charset
      Throws:
      IOException - if the requests input stream cannot be accessed, read from or closed
      javax.servlet.ServletException - if the content length of the request is not specified of if the request's content type is not 'text/x-gwt-rpc' and 'charset=utf-8'

    • readContentAsUtf8

      @Deprecated public static String readContentAsUtf8(javax.servlet.http.HttpServletRequest request, boolean checkHeaders) throws IOException, javax.servlet.ServletException
      Deprecated.
      Use readContent(javax.servlet.http.HttpServletRequest, java.lang.String, java.lang.String) instead.
      Returns the content of an HttpServletRequest by decoding it using the UTF-8 charset.
      Parameters:
      request - the servlet request whose content we want to read
      checkHeaders - Specify 'true' to check the Content-Type header to see that it matches the expected value 'text/x-gwt-rpc' and the content encoding is UTF-8. Disabling this check may allow some types of cross type security attacks.
      Returns:
      the content of an HttpServletRequest by decoding it using the UTF-8 charset
      Throws:
      IOException - if the requests input stream cannot be accessed, read from or closed
      javax.servlet.ServletException - if the content length of the request is not specified of if the request's content type is not 'text/x-gwt-rpc' and 'charset=utf-8'

    • setGzipEncodingHeader

      public static void setGzipEncodingHeader(javax.servlet.http.HttpServletResponse response)
      Sets the correct header to indicate that a response is gzipped.

    • shouldGzipResponseContent

      public static boolean shouldGzipResponseContent(javax.servlet.http.HttpServletRequest request, String responseContent)
      Returns true if the request accepts gzip encoding and the response content's estimated UTF-8 byte length exceeds 256 bytes.
      Parameters:
      request - the request associated with the response content
      responseContent - a string that will be
      Returns:
      true if the request accepts gzip encoding and the response content's estimated UTF-8 byte length exceeds 256 bytes

    • writeResponse

      public static void writeResponse(javax.servlet.ServletContext servletContext, javax.servlet.http.HttpServletResponse response, String responseContent, boolean gzipResponse) throws IOException
      Write the response content into the HttpServletResponse. If gzipResponse is true, the response content will be gzipped prior to being written into the response.
      Parameters:
      servletContext - servlet context for this response
      response - response instance
      responseContent - a string containing the response content
      gzipResponse - if true the response content will be gzip encoded before being written into the response
      Throws:
      IOException - if reading, writing, or closing the response's output stream fails

    • writeResponseForUnexpectedFailure

      public static void writeResponseForUnexpectedFailure(javax.servlet.ServletContext servletContext, javax.servlet.http.HttpServletResponse response, Throwable failure)
      Called when the servlet itself has a problem, rather than the invoked third-party method. It writes a simple 500 message back to the client.
      Parameters:
      servletContext -
      response -
      failure -