Class ProxyPropertiesHandler

  • All Implemented Interfaces:
    Handler

    public class ProxyPropertiesHandler
    extends GenericProxyHandler
    implements Handler
    Obtain properties format content from remote websites, and add it to the current request properties. Many of the handlers are designed to produce side effects, by inserting values into the request properties (see PropertiesHandler). If they are instead configured to produce the properties in java properties format, then this handler will read their output, and place the result in the request object on their behalf. This capability allows certain handlers to be run on other web sites, yet behave as if they are in the handler chain. The following request properties are used:
    type
    The document type for files to process as java properties (defaults to text/plain)
    prepend
    The prefix that should be prepended to each property before it is inserted into the request properties
    url
    The url that should be used to fetch the remote content. If not specified, the curent url is used instead. Any ${...} constructs in the url are evaluated at each request.
    NOTE: This capability should be generalized.
    Version:
    2.2, 04/08/30
    Author:
    Stephen Uhler
    • Constructor Detail

      • ProxyPropertiesHandler

        public ProxyPropertiesHandler()
    • Method Detail

      • init

        public boolean init​(Server server,
                            java.lang.String prefix)
        Description copied from class: GenericProxyHandler
        Do one-time setup. get and process the handler properties. we can contact the server identified by the host parameter.
        Specified by:
        init in interface Handler
        Overrides:
        init in class GenericProxyHandler
        Parameters:
        server - The HTTP server that created this Handler. Typical Handlers will use Server.props to obtain run-time configuration information.
        prefix - The handlers name. The string this Handler may prepend to all of the keys that it uses to extract configuration information from Server.props. This is set (by the Server and ChainHandler) to help avoid configuration parameter namespace collisions.
        Returns:
        true if this Handler initialized successfully, false otherwise. If false is returned, this Handler should not be used.
      • respond

        public boolean respond​(Request request)
                        throws java.io.IOException
        Description copied from class: GenericProxyHandler
        If this is one of "our" url's, fetch the document from the destination server, and return it as if it was local.
        Specified by:
        respond in interface Handler
        Overrides:
        respond in class GenericProxyHandler
        Parameters:
        request - The Request object that represents the HTTP request.
        Returns:
        true if the request was handled. A request was handled if a response was supplied to the client, typically by calling Request.sendResponse() or Request.sendError.
        Throws:
        java.io.IOException - if there was an I/O error while sending the response to the client. Typically, in that case, the Server will (try to) send an error message to the client and then close the client's connection.

        The IOException should not be used to silently ignore problems such as being unable to access some server-side resource (for example getting a FileNotFoundException due to not being able to open a file). In that case, the Handler's duty is to turn that IOException into a HTTP response indicating, in this case, that a file could not be found.

      • shouldFilter

        protected boolean shouldFilter​(MimeHeaders headers)
        See if the content needs to be filtered Return "true" if "modifyContent" should be called
        Overrides:
        shouldFilter in class GenericProxyHandler
        Parameters:
        headers - mime headers for data to proxy
      • modifyContent

        public byte[] modifyContent​(Request request,
                                    byte[] content)
        Description copied from class: GenericProxyHandler
        Rewrite the links in an html file so they resolve correctly in proxy mode.
        Overrides:
        modifyContent in class GenericProxyHandler
        Parameters:
        request - The original request to this "proxy"
        Returns:
        true if the headers and content should be sent to the client, false otherwise Modifies "headers" as a side effect