CAUTION: This e-mail originated outside the University of Southampton.

Hi Jens,
I'm glad it helped a bit - even if it wasn't a solution. A few more musings below. I think there must be a way to make it work.

The key is possibly in the PerlOutputFilterHandler. 

In a cgi script, something like (entirely untested! Just thinking out loud...):

##############

use Apache2::Filter;

use Apache2::SSI;

my $r = $repo->get_request;

$r->add_output_filter(\&Apache2::SSI::handler);

# do stuff, return page

##############

If you get it working, and you wanted it to apply to all cgi requests, you could put something similar in a URL rewrite trigger that matches 'cgi'.

Make sure the rewrite trigger does not​ set a return code - so the normal handlers will then process the actual request.

Cheers,

John

From: jens.witzel@uzh.ch <jens.witzel@uzh.ch>
Sent: 07 May 2021 13:28
To: John Salter <J.Salter@leeds.ac.uk>
Cc: eprints-tech@ecs.soton.ac.uk <eprints-tech@ecs.soton.ac.uk>; jens.witzel@uzh.ch <jens.witzel@uzh.ch>
Subject: Antwort: RE: [EP-tech] Short question about SSI in dynamic CGI output

Dear John

thank you for your thoughts on the topic. You're right: after testing a lot it really looks like the request for a CGI script does not trigger the SSI handler. We've got to go the perl-based way rather than SSI.

Kind regards
Jens

--
Jens Witzel
Zentrale Informatik
Universität Zürich
Stampfenbachstrasse 73
CH-8006 Zürich

mail:  jens.witzel@uzh.ch
phone: +41 44 63 56777
http://www.zi.uzh.ch

"John Salter" ---20.04.2021 18:11:15---Hmmm, good question! If you print an SSI instruction directly from the CGI script, does that get con

Von: "John Salter" <J.Salter@leeds.ac.uk>
An: "eprints-tech@ecs.soton.ac.uk" <eprints-tech@ecs.soton.ac.uk>, "jens.witzel@uzh.ch" <jens.witzel@uzh.ch>
Datum: 20.04.2021 18:11
Betreff: RE: [EP-tech] Short question about SSI in dynamic CGI output

---

Hmmm, good question!

If you print an SSI instruction directly from the CGI script, does that get converted as expected? E.g. does
print '<!--#echo var="DATE_LOCAL" -->';
output a date, or '<!--#echo…'?
 
I haven't used SSIs alongside EPrints, but if the above doesn't interpret the SSI instruction my guess would be the PerlResponseHandler used for CGI scripts within EPrints::Apache::Rewrite module.

I find the diagram here: https://perl.apache.org/docs/2.0/user/handlers/http.html#HTTP_Request_Cycle_Phases useful to try and work out what the difference might be between e.g. a static page+template being served compared to a cgi script.

The request for a CGI script might not trigger the SSI handler - but you may be able to add it to the stack, or a different phase (or even the output handlers).
 
The start of this page: https://wiki.eprints.org/w/How_to_enable_server_side_includes indicates that someone has been down this path before:
"If you want to add dynamic content to the template you should do this via a template part in cfg.d/dynamic_template.pl"

They possibly included a maintenance.ssi file using perl-based methods rather than SSI methods?
 
Cheers,
John
 
From: eprints-tech-bounces@ecs.soton.ac.uk [mailto:eprints-tech-bounces@ecs.soton.ac.uk] On Behalf Of jens.witzel--- via Eprints-tech
Sent: 20 April 2021 16:06
To: eprints-tech@ecs.soton.ac.uk
Subject: [EP-tech] Short question about SSI in dynamic CGI output
 
CAUTION: This e-mail originated outside the University of Southampton.

Hi out there

maybe stupid. maybe simple, maybe offtopic, maybe not:

We found out, that Server Side Includes (SSI) inside phrase dynamic.xml or templates will not be interpreted by cgi-scripts like cgi/stats/report.
Scenario: We generate static code, push it into a simple textfile.ssi and try to include it in the template with  <!--#include virtual="/maintenance.ssi" -->

So, in a nutshell: HowTo tell CGIs/Apache to use SSI after CGI has done? We thought, we tried out everything in Apache conf.
Any hint is appreciated #-)

Kind regards
Jens

--
Jens Witzel
Zentrale Informatik
Universität Zürich
Stampfenbachstrasse 73
CH-8006 Zürich

mail:  jens.witzel@uzh.ch
phone: +41 44 63 56777
http://www.zi.uzh.ch