Webadmin SOC2008

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Picture Frame.png This page contains the design document for an enhancement or feature. It is a work of collaborative development, and may not represent the final design. If you are not part of the development or design group, please post comments and suggestions on the talk page and not in the middle of the design.


I intend to construct a feature-complete web-based control interface for the BZFlag server during this project. Although there already exists a Javascript/HTML tool for generating config files, this, which you could call a reworking of `bzfs_conf.html`, will expand on the interface to allow other administration and configuration tasks. These include, among other things, saving the configuration on the server-side, reading and clearing logs, and controlling and checking the status of the daemon. Ideally, there would be a way to control every aspect of the server from a web browser. The primary focus in designing the interface will be ease of use, but only when not at the cost of security or portability.

An example feature lacking in `bzfs_conf.html` is the ability to edit and save the several other config-related files, like badwords and helpmsg, from within the browser. This is reasonable, since Javascript can't usually write to disk, but for this project, it's a necessity. It could be as simple as a text field, but a more sophisticated interface might be useful, such as a table of banned IP addresses with a custom input form and buttons to remove addresses from the list. Depending on the of complexity and layout of these, a separate page for the editing interface for each file might also be warranted. On the other hand, the daemon will overwrite a few files on exit for the things that can be changed by server commands, like the banlist, so a better option for those might be to let the user issue commands to the server from the web interface, which would give control over other parts of the server, as well.

I will allow the user to choose from plugins and maps in pre-defined folders, and upload custom maps. (Although it would be interesting to do the same for plugin files, I don't think that there would be any nice way of keeping it secure.) Depending on the relative difficulty, I may either try to validate maps on upload or let BZFS check them on startup. Map uploads are actually a high priority for me, because I think that they would add a great deal of flexibility in the way one manages a BZFS. One possible offshoot of this project, for example, would be to build a BZFS farm, where registered users can create and configure their own game servers entirely through their browsers. With an interface for map uploads, this could have a noticeable impact on the BZFlag community by giving them an open creative platform.

As I noted earlier, security is a large concern, along with portability. For instance, Javascript has a large potential to make the interface more human-friendly, validating input, greying out dependent options, etc. -- `bzfs_conf.html` uses Javascript liberally for such purposes. However, it's likely that not every user will enable Javascript in their browsers, so in addition to validating everything on server-side, I aim to make the interface as easy to use as possible even when user scripting is not available.

On the same note, there should be very few external tools used in this project, so that it can be deployed as widely as possible. It could be written in PHP or another common scripting language, but that would require whatever language I choose to be present on the host machine. Granted, PHP is very widely available, but since BZFlag is written in C++ already, I could write the interface in C or C++. This is the most likely outcome, because this would also allow it to be implemented as a plug-in, using the in-port HTTP feature of the BZFS API, which would make the interface more convenient to deploy. However, in order to ease development, I may use a scripting language to create a working prototype and use that as a blueprint to rewrite it in the lower-level language.

As for testing, I maintain a VPS at which I could set up a public BZFS server and BZFWeb interface for others to try and give suggestions. I will also be testing each component as it is added, hopefully with BZFlag developers ensuring that my unit tests are checking for the correct behavior, and that all of the edge cases are covered.

Finally, when all is done, I hope to be able to help the BZFlag team package BZFWeb along with the server distribution. I think it would improve the usability of the server, and could attract more users that were previously daunted by the process of setting up and maintaining a BZFS.