Out of curiosity, I did a little looking at available modules on CPAN.

For handling URLs in user posted content, URL::Transform might be of use.

Though, you might want to look at how HTML::Copy modifies URLs.

For serving the images, you could, as Corion suggested, create a local proxy script. Maybe you could use HTTP::Proxy. It does provide a mechanism for defining filtering. It's not clear if there's a way to to make it use a LWP::UserAgent::Paranoid object instead of a plain LWP::UserAgent object. But, I think you could enhance the new method to allow specifying that LWP::UserAgent::Paranoid be used instead. (Then submit a patch to the author for your enhancement.)

However, given the Javascript problem Corion mentioned and other possible malicious content problems, I think it would be a better idea to not display user submitted links as inline images, rather just make them clickable links. (This is how many other forum sites work.)

In reply to Re: Basic Remote Image to SSL Server by RonW
in thread Basic Remote Image to SSL Server by Beaker

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.