Jigsaw Hacked Client Download

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What is Jigsaw ?

Using Jigsaw

  • How do I tie a resource to a directory not under my server root? [Sirilyan sirilyan@io.com]

Technical stuff

Using Servlets

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You think your question about Jigsaw is worth entering this list,you have a better formulation for some of the answers ? Mail tojigsaw@w3.org !

What's the purpose of Jigsaw ?

Jigsaw is the new W3C reference server. Its main purpose is to demonstratenew protocol features as they are defined (such asHTTP/1.1 orPICS), and to provide the basis for experimentationsin the field of server software (such as the provided MUX prototypicalimplementation).

Where can I get Jigsaw ?

You can download Jigsaw distribution file in various formats, andusing either ftp or http:

Windows zip files (1.5Mo)
UNIX gzip tar file (700Ko)

Why is Jigsaw written in Java ?

Java has a number of advantages thatfit well with our purposes. It provides portable threads and garbage collection,allows for a very dynamic server architecture. It's ability to move codearound may be use in future development to experiment with the mobile codeconcept.

Jigsaw is written in Java, it must be really slow..

No so true ! Check out theperformanceevaluation of Jigsaw, which indicates that it performs at leastas well as the CERN server.

What is this indexing thing all about ?

To a normal HTTP web-admin, Jigsaw's configuration process might lookreally strange..Jigsaw's designemphasis two different processing stage in serving documents:

Indexing stage
When documents enter the Web
Serving stage
When documents are served to clients

In short the rationale for separating these two stages is to make theserving stage as efficient as possible, by having the indexingstage prepare as much as possible the work. A document enter theWEB space the first time Jigsaw serves it; this happen behind thescene most of the time, and consist in creating a resource for thedocument to be served by querying a resource factory. The currentresource factory can be configured to create various kind of resources basedeither on the file name extensions, or (in case of a directory) based onits name.

However, once a resource is created, it no longer reflects the settings ofthe resource factory (available resp. as /Admin/Extensions and/Admin/Directories); in some sense the information getscompiled so that at serving time, processing overhead is reduced asmuch as possible.

What are all these information in the form based resource editor ?

The current version of the generic resource editor is rather terse. At thispoint, the resource editor will present all the declared resource attributevalues and some ways to edit them. All the attributes are declared in eachresource referencemanual.

Resource editors is an area in which you can expect big improvement in thenext release. Right now, it is recommended that you use two browser windows,one displaying the form based editor, and the other one displaying theappropriate reference manual for the resource being edited (which describedall the attributes semantics).

How do I setup authentication ?

Setting up authentication through the form based interface requires you torun through the following stages:

  1. Create an authentication realm, if required. This is done through the Realms resource, usually available as /Admin/Realms. You can of course reuse authentication realms to protect different areas of the server.
  2. Setup an authentication filter on the appropriate resource. The target of the filter can be either a directory resource (in which case the filter will protect all the area defined by the sub-resources of this directory resource), or any other filtered resource (hence allowing you to protect a single resource). Setting up an authentication filter is done by editing the target resource, through the generic resource editor. If you want to protect, say the /protected directory resource, then you have to bring up its editor, which will usually be available as /Admin/Editor/protected.
  3. Setup the authentication filter parameters. Once the filter is plugged in, you can edit its attribute by clicking on the appropriate link in the bottom of the target resource editor.

That's it ! For more information, you may want to read through theconfigurationtutorial.

How do I tie a resource to a directory not under my server root?
Contributed by Sirilyan <sirilyan@io.com>

CERN server implemented this through the Pass directive, which let you mapa server path to an absolute path on your file system. Jigsaw uses thew3c.jigsaw.resources.PassDirectory resource.

COOKBOOK METHOD: Create a new resource with Add resources in the Editorat the location you want the new server path to exist. Assign whatever nameyou desire to the new resource, and assignw3c.jigsaw.resources.PassDirectoryfor the class. Edit this new resource to change the pass-target attributeto the absolute path to the directory you want to serve.

You may want to change the name attribute of the 'index' file in that directoryto Overview.html. name and filename are two separate attributes in Jigsaw;this is also a poor man's (or a Win95/NT user's) symlink.

Serving directories outside your server root may be a security risk.

How do I setup CGI scripts ?

They are two ways to setup CGI scripts. The manual way requires that youdescribe each script to the server. Let's say your script's path relativeto the server root is WWW/cgi-bin/myscript. You will first haveto create an appropriatew3c.jigsaw.forms.CgiResourceinstance to wrap your script, by pointing your browser to the/Admin/Editor/cgi-bin/ directory resource. Click the Add resourcelink, and enter the name under which you wish your script to be seen, andthew3c.jigsaw.forms.CgiResourceas the resource class.

Then edit the newly created resource, and setup it's command line (the commandline the server will use to run your script). Each line of the text fieldshould represent one argument, the first one being the script full path.

You can also register files of a given extension as scripts, by using the/Admin/Extensions extension editor. Say you want to have all.pl files to be exported as perl scripts. Register the extension,and map it to thew3c.jigsaw.forms.CgiResource;when required, you can even specify the interpreter to be run to executethe script (for example, under Windows 95, or NT).

Hacked

How do I setup Jigsaw as a proxy ?

Running Jigsaw as a proxy involves the following steps:

  • Create an instance of the w3c.jigsaw.proxy.ProxyDirectory resource in the root resource store, by pointing your browser to /Admin/Editor and selecting the Add resource link. Type in the name of the resource (ie proxy), and its class (w3c.jigsaw.proxy.ProxyDirectory).
    At this point, you will need to edit this resource's attributes. To do so, select the Existing Resources link which will display a list of resources including the newly created proxy. Follow the proxy link to display an editable list of attributes of the proxy resource. You should set the local-root attribute to the old root resource (ie root under the default configuration) and select OK. This will make sure that requests targeted to the proxy itself will be served by the normal server, allowing for access to the configuration.
  • Once the new resource is created, set it as the root resource of your server, by pointing your browser to /Admin/Properties/general and setting the root resource's name property (w3c.jigsaw.root.name) to proxy. Then select OK.
    Now point your browser to /Admin/Properties and select the Save Properties link.
  • Jigsaw is now running as a proxy reconfigure your browser to run it..and have fun !

How can I extend Jigsaw ?

Jigsaw can be extended in a number of ways. Here are just three possiblethings you can play with, from the simplest to the complex ones:

  • Writing new resource classes: you may want to read the tutorial on this subject before getting any further. You can think of this as being a n efficient replacement for CGI scripts, although this is a much more powerful environment to extend the server.
  • Writing new filter classes: if you want to experiment with specific authentication needs, or if you require special logging formats. A tutorial on writing new filters is also available.
  • Hacking Jigsaw. Right now you can just override any of the Jigsaw classes to replace its implementation. In the future, most of the interesting things that you can do this way will be turned into specific interfaces (as is already the case for logging right now).

Why does Jigsaw implement its own persistence mechanism

JigsawInner city big fun acapella download sites. implements its own persistence mechanism while RMI alreadyprovides a way to serialize objects, why is it so, will it change ? WhatJigsaw implements in the w3c.tools.store package is morethen persistence. It provides both a way of serializing objects anda way of describing what and how the object will be dumped. The availablemeta-description of objects (that you can obtain through thegetAttributes method of resources), is a central part ofJigsaw architecture, since it offers the ability to create genericresource editors. This is not likely to disappear.

However, Jigsaw persistence mechanism may be merged in the futureto the RMI interface, just by providing an implementation of thereadObject and writeObject method through its existingmechanism.

How can I use HotJava on top of Jigsaw's HTTP client API ?

HotJava is Sun'sJava based browser. If you want to experience an HTTP/1.1 compliant browser,you can run this browser on top of Jigsaw's HTTP/1.1 compliant HTTPclient API. To do so, you need to define thejava.protocol.handler.pkgs property to w3c.www.protocolbefore launching HotJava. The best way to do so is to edit the HotJavaproperty files.

Jigsaw's HTTP client API defines a number of other properties, ifyou are planing to use this setting, you should read theHttpManagerdocumentation to get the complete list of available properties. These willallow you to add caching, authentication, proxying and more toHotJava !

Running Jigsaw on port 80 under UNIX

As of release 1.0alpha5, Jigsaw can now run on port 80, without runningas the root user. To implement that you need to install the relevantpiece of native code. This C code has been compiled and tested under Solaris,porting it to a different platform/architecture should be pretty easy.

Follow the normal installation procedure, and try to run Jigsaw ona port greater than 1024. Once this work, stop Jigsaw (through/Admin/Exit), Make sure your LD_LIBRARY_PATH variable includes thedirectory containing libUnix.so (this is the Jigsaw/libdirectory under the standard release).

Select the user and group you want Jigsaw to run as. Make sure thatuser has read/write access to the entire config directory. Then,you just need to run Jigsaw through that special command line:

java w3c.jigsaw.Main -user user -group group<other-options>

Where user and group should provide (resp.) the user and thegroup you want Jigsaw to run as.

Warning: As the underlying UNIX process will change personnality rightafter acquiring the socket, the form based restart button (availablefrom the properties editor) will no longer work, since the process will nolonger be able to allocate a socket on port 80.
Under such a setting, the only way to restart Jigsaw is to kill it(through /Admin/Exit) and restart it manually.

Chrooting Jigsaw under UNIX

As of release 1.0alpha5, Jigsaw can now - under UNIX - be chroot'ed.If you try to do so, you are supposed to have some experiences with chroot'ingprograms. We will assume that you already have a correct root to run a standardHTTP server and that you have read and understood the Running Jigsaw onport 80 FAQ entry.

You need to install Java in that root (using whatever prefered way you want).To install Jigsaw, I would recommend using the following directorystructure:

/usr/local/jigsaw/classes
Should contain Jigsaw's current distribution jigsaw.zip class file
/usr/local/jigsaw/extensions
Is used to add extensions to the server while running, and should be included in your CLASSPATH, before you start Jigsaw.
/usr/local/jigsaw/lib
Should contain Jigsaw's native code support - ie libUnix.so -(to make the appropriate UNIX system calls)

Given that (don't forget to symlink the real /usr/local/jigsaw to the chroot'ed one), you should be ableto reuse that script:

What are servlets ?

Servlets are server-side extensions programmed against theServletAPI. This interface is philosophically equivalent to the old CGIinterface, but is both more powerfull and extremely more efficient. Moreinformation is available atjeeves.javasoft.com.

How do I compile Jigsaw to use the servlets ?

NOTE: The default version of jigsaw has been compiled with servlet support,to use

Be sure to have a recent version of the servlet classes. Update your CLASSPATHto use those classes. Modify the Makefile in src/classes/w3c/jigsaw and addthe servlet package at the end of the PACKAGES list, like this:

contrib
upgrade
servlet

Then, uncomment the line 144 of w3c/jigsaw/ssi/DefaultCommandRegistry.javalike this:

new w3c.jigsaw.ssi.servlets.ServletCommand()

and adds the servlets package in the Makefile of the w3c.jigsaw.ssi package,like this:

PACKAGES =
jdbc
servlets

Now, you can recompile jigsaw.

How do I install a servlet ?

Installing a servlet is pretty easy !

First of all, you have to choose where you want to place your servlets inyour filesystem; this will usually be a single directory, typically somehtinglike servlets under your server's WWW directory. Once you havecreated the filsystem directory, create a Jigsaww3c.jigsaw.servlet.ServletDirectoryto export it. That resource will act as a context for all the servletsunder it (Jigsaw can handle multiple servlet contexts within a single server).You can now add servlets into this special directory. Each servlet is managedby aw3c.jigsaw.servlet.ServletWrapper,to add a servlet you just have to create a ServletWrapper and in theservlet-class field put the class name of the servlet witch must bein the directory relative to the ServletDirectory resource.

Example :

You want to install the DateServlet in the WWW/servlets directory:

  1. Create the directory servlets under WWW
  2. Start the JigAdmin program and unfold all the nodes down to the space node.
  3. Select the space node, and activate the Resources editor helper. Enter the ServletDirectory identifier (ie servlets) and the class of the resource (ie w3c.jigsaw.servlet.ServletDirectory)
  4. Put the servlet class (ie DateServlet.class) in WWW/servlets.
  5. Create a ServletWrapper to the ServletDirectory and call it DateServlet for example.
  6. Set the servlet-class field of the ServletWrapper to DateServlet
  7. Commit your changes

Now DateServlet is reachable athttp://your-server-host/servlets/DateServlet.

How does Jigsaw load local servlet classes ?

Jigsaw use a ServletClassLoader to load servlet classes from theServletDirectory. If a servlet class is modified when jigsaw is running,the ClassLoader look at the last modified date of the class in memory andthe class on the disk and reload the classe if its necessary.

How can I load remote servlets ?

You can use remote servlets by using a RemoteServletWrapper instead of theServletWrapper.

Example : Add the remote servlethttp://www.servlet.com/RemoteServlet.class to jigsaw.

  1. Create the RemoteServletWrapper in the ServletDirectory.
  2. Set its 'servlet-base' field to http://www.servlet.com
  3. Set its 'servlet-class' field to 'RemoteServlet' (without .class)
  4. Commit changes.

Note : the url http://www.servlet.com/RemoteServlet.class mustbe a Java compliant class file.

Jigsaw Team
$Id: FAQ.html,v 1.28 1998/05/27 13:00:32 yves Exp $