[Koha-bugs] [Bug 12620] Proxy Add-on for Koha z39.50/SRU servers

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=12620

--- Comment #8 from David Cook <dcook at prosentient.com.au> ---
(In reply to Galen Charlton from comment #2)
> Depending on the nature of the proxy involved, it may not be necessary to
> use YAZProxy. In particular, the YAZ toolkit supports a special connection
> syntax to direct Z39.50 and SRU traffic through a proxy.
> 
> For example, suppose you have a Squid proxy running on localhost and
> listening on port 210, and further suppose that the proxy is configured to
> allow connecting to the target Z39.50 server(s).  In that case, with
> yaz-client you can do something like this:
> 
> yaz-client connect:localhost:3128,tcp:lx2.loc.gov:210/LCDB
> 
> and that will get you a proxied Z39.50 connection to the Library of Congress.

It took a bit of digging but I found some information about that syntax that
Galen mentioned:

https://github.com/indexdata/yaz/blob/master/NEWS#L2365

So in that case you'd be doing "yaz-client
connect:EDUPROXY:PROXYPORT,tcp:lx2.loc.gov:210/LCDB".

Now ZOOM doesn't explicitly mention support for this syntax
(https://metacpan.org/pod/distribution/Net-Z3950-ZOOM/lib/ZOOM.pod). Of course,
neither does yaz-client (https://linux.die.net/man/1/yaz-client). As I said,
the documentation leaves something to be desired.

I'm waiting to hear back from Adam Dickmeiss about that. 

But looking at C4::Breeding::_create_connection... it looks like Koha would
need a little patch to change how we pass in the connection string.

Instead of '$obj->connect( $server->{host}, $server->{port} )', we'd want to
use something like '$obj->connect($host)' where $host is constructed based on
whether or not there is a proxy. (See
https://metacpan.org/pod/distribution/Net-Z3950-ZOOM/lib/ZOOM.pod#new())

I could keep digging through source code but I think it'll just be easier to
wait for Adam's response.

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