Image::Size and Location

[Joachim Zobel <nc...@netcologne.de>]

Hi.

I would like to use Image::Size based on a Location instead of using it
on a file. Is there a way to do URI trans. (and may be content
negotiation) without doing a subrequest? What is the best way to do
this, if not?

Thanx,
Joachim

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koennen."                            - Bertolt Brecht - Leben des
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Re: Image::Size and Location

["Randy J. Ray" <rj...@tellme.com>]

> I would like to use Image::Size based on a Location instead of using it
> on a file. Is there a way to do URI trans. (and may be content
> negotiation) without doing a subrequest? What is the best way to do
> this, if not?

(A better first step would have been to write me at the maintainer address in 
the documentation. Luckily, I read this list as well. :-)

The main reason that I've never put anything like this directly into the API 
is that the specification of things like the document root differ across 
different http servers. And even under Apache, the ultimate path can be 
affected by aliases, rewrite rules, etc.

My recommendation to users under mod_perl is to use the sub-request mechanism. 
Citing from the Apache(1) manpage:

SUB REQUESTS
        Apache provides a sub-request mechanism to lookup a uri or
        filename, performing all access checks, etc., without
        actually running the response phase of the given request.
        Notice, we have dropped the "sub_req_" prefix here.  The
        "request_rec*" returned by the lookup methods is blessed
        into the Apache::SubRequest class.  This way,
        "destroy_sub_request()" is called automatically during
        "Apache::SubRequest->DESTROY" when the object goes out of
        scope.  The Apache::SubRequest class inherits all the
        methods from the Apache class.

        $r->lookup_uri($uri)
               my $subr = $r->lookup_uri($uri);
               my $filename = $subr->filename;

               unless(-e $filename) {
                   warn "can't stat $filename!\n";
               }

        $r->lookup_file($filename)
               my $subr = $r->lookup_file($filename);

(Which of the two you use would depend on your circumstances.)

Hope this helps.

Randy
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