url rewrite - varnish

[Paul A. Procacci]

On Tue, Feb 05, 2013 at 10:29:03AM +0000, nic?e lenny bessay wrote:
> Hi Sir,
>
> I'm having problem rewriting the request from varnish to query the backend.
>
> Here is what varnish receive ==>
>
>
> http://cmsfoqua:8180/vgnExtTemplating/stresource?SecurityKey=lVPNsLcf&SiteName=axabanque&ServiceName=DetailLAB&Language=fr&ResourceName=Entete&TTL=3600&CIBLAGE=
>
> And I would like varnish to rewrite the url like this (http://cmsfoqua/xml/DetailLABEntete.xml) , then call the backend.
>
> Here is my rule in vcl_recv subroutine:
>
> set req.url = regsub(req.url, "^/vgnExtTemplating/stresource.([&?]SecurityKey=([a-zA-Z0-9])|[&?]SiteName=([a-zA-Z])|[&?]ServiceName=([a-zA-Z])|[&?]Language=([a-zA-Z])|[&?]ResourceName=([a-zA-Z])|[&?]TTL=([0-9])|[&?]CIBLAGE=([a-zA-Z]))*", "/xml/\1\2\4.xml");
>
> Here is actually what the backend get : /xml/.xml
>
> Please, Help!!!!
>

I'm not entirely sure if you can chain regsub's together as I've never done so (you probably can),
but the following (or similar) can pull the values you need from the url.

if(req.url ~ "^/vgnExtTemplating/stresource\?"){
  set req.url = "/xml/" + regsub(req.url, ".*SecurityKey=([^&]+).*", "\1") + regsub(req.url, ".*SiteName=([^&]+).*", "\1") + regsub(req.url, ".*Language=([^&]+).*", "\1") + ".xml";
}

If that doesn't work, you can do something similar to the following:

if(req.url ~ "^/vgnExtTemplating/stresource\?"){
  set req.http.X-SecurityKey = regsub(req.url, ".*SecurityKey=([^&]+).*", "\1");
  set req.http.X-SiteName = regsub(req.url, ".*SiteName=([^&]+).*", "\1");
  set req.http.X-Language = regsub(req.url, ".*Language=([^&]+).*", "\1");
  set req.url = "/xml/" + req.http.X-SecurityKey + req.http.X-SiteName + req.http.X-Language + ".xml";
  remove req.http.X-SecurityKey;
  remove req.http.X-SiteName;
  remove req.http.X-Language
}

Once variable negative lookbehind assertions are implemented in PCRE, you'd be able to
accomplish this with a one-liner.  Hope that helps.

~Paul

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