LaTeX Web-Based LaTeX, Maxima, and R Software

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I am designing web software to interface to [itex]\LaTeX[/itex], Maxima and R.

What I wanted to get feedback about is:

1) Security issues which may arise from calling Maxima and R from the web. The interface is going to be a AJAX GUI and not a raw command-line input form so I will be able to filter malicious code. For the Maxima interface, I am disabling characters like the semi-colon and dollar-sign that may jeopardize the system and also heavily filter incoming data. It is a GUI so I can prevent unwanted commands from being executed.

2) The viability of keeping this a free site without any ads. I wanted to be able to cover the hosting cost involved with voluntary donations. I know Sage Notebook already exists but it doesn't have a GUI which I was planning to design. With the R version of the site users should be able to upload datasets to operate on. I am going to accomplish this with FileField in Drupal. I don't know many site that offer this kind of service so it is something unique I can provide.

The site already has some operational features:

1)Creating LaTeX images using a Javascript toolbar.

2)Allow users to Chat in a LaTeX based environment with capabilities to exchange graphs and sketches.

I wanted to post the url so that people could take a look and give feedback and comments, but wanted to get the OK since this may seem to violate advertising guidelines posted in the rules. The site is registered as a '.com', but I also own the '.net' version of the domain which points to the same place.

Any kind of feedback and direction is very much appreciated.

P. Magunia
 

Borek

Mentor
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After some backroom discussion Mentors tasked me with posting links to the site:

http://sharpermath.com/content/latex-image-generator" [Broken]

http://sharpermath.com/chat" [Broken]
 
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Thank you for posting the links Borek.

I wanted to mention something else notable. I've made progress with the web-based Maxima interface I mentioned in my earlier post.

Maxima is computer algebra system capable of computing floating points to arbitrary position and much more.

The interface I have designed allows computation of limits, derivatives, integrals and more. The default example I have is the the limit to compute [tex]e^x[/tex]. The Maxima output is Tex friendly and mimetex automatically renders the image to GIF.

If you wanted to compute [tex]2^{1000}[/tex] that is possible. Computations are not limited to Calculus.

Allowing public use of Maxima on a web server is a security concern, I know. Special characters and the semi-colon are not allowed. Users are also limited to 3 seconds of CPU time which I found to be plenty for even [tex]2^{100,000}[/tex] though I am not sure web addresses of that length are allowed by my web server. Insecure commands are also filtered out.

If nobody objects I would like to post the link here.
 
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I am guessing nobody is objecting.

http://sharpermath.com/content/maxima-interface" [Broken]

Also for calculations of limits the following page would be very useful. You can specifiy [tex]f(x)[/tex], [tex]c[/tex], the variable of interest, and the direction of the limit. Maxima constants used are 'inf' and 'minf'. The output is pure Tex.

http://sharpermath.com/content/maxima-limit-evaluate" [Broken]

These services are comparable to Wolfram's Integrator. I hope the community finds them useful.
 
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