Puppet users - Oct 2011 - ERB: apache2 vhost template - iterating over array writing out mod_rewrite rules

Hi guys,

I''m having a problem and maybe somebody might be able to help out with
that. I have a plain simple erb template which I''m basically using for
writing out my vhost files for apache2. Using mod_rewrite I want to control
the redirect based on aliaes assigned to the vhost:

-------------------------------8<---------------------------------
RewriteCond %{HTTP_HOST}   ^vhost\.alias1\.tld [OR]
RewriteCond %{HTTP_HOST}   ^vhost\.alias2\.tld
RewriteRule ^/(.*)         http://target.website.tld/$1 [L,R=301]
------------------------------->8---------------------------------

Using this snippet works just fine but trying to cover it within an erb
template while iterating over an array of possible aliases turned out to be
much more complex then I first thought... ;)

Using the following erb snippet ...

-------------------------------8<---------------------------------
[...]
  <% if has_variable?("vhostaliaes_regex") then %>
  <% vhostaliases_regex.each do |Alias| %>
  RewriteCond %{HTTP_HOST}  <%= Alias %> [OR] <% end %>
  RewriteRule ^/(.*)  http://<%= servername %>/$1 [L,R=301]
  <% end %>
[...]
------------------------------->8---------------------------------

... will result in the following output:

-------------------------------8<---------------------------------
RewriteCond %{HTTP_HOST}   ^vhost\.alias1\.tld [OR]
RewriteCond %{HTTP_HOST}   ^vhost\.alias2\.tld [OR]
RewriteRule ^/(.*)         http://target.website.tld/$1 [L,R=301]
------------------------------->8---------------------------------

Because of the additional ''[OR]'' parameter at the end of the
second line an
endless loop is being created crashing all vhosts. Does anybody have an
idea on how to deal with this?

Thanks :)

Cheers
- Jan

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On Tue, Oct 25, 2011 at 5:38 PM, jayd <jan@agetty.de>
wrote:
> Hi guys,
>
> I''m having a problem and maybe somebody might be able to help out
with
> that. I have a plain simple erb template which I''m basically using
for
> writing out my vhost files for apache2. Using mod_rewrite I want to control
> the redirect based on aliaes assigned to the vhost:
>
> -------------------------------8<---------------------------------
> RewriteCond %{HTTP_HOST}   ^vhost\.alias1\.tld [OR]
> RewriteCond %{HTTP_HOST}   ^vhost\.alias2\.tld
> RewriteRule ^/(.*)         http://target.website.tld/$1 [L,R=301]
> ------------------------------->8---------------------------------
>
> Using this snippet works just fine but trying to cover it within an erb
> template while iterating over an array of possible aliases turned out to be
> much more complex then I first thought... ;)
>
> Using the following erb snippet ...
>
> -------------------------------8<---------------------------------
> [...]
>  <% if has_variable?("vhostaliaes_regex") then %>
>  <% vhostaliases_regex.each do |Alias| %>
>  RewriteCond %{HTTP_HOST}  <%= Alias %> [OR] <% end %>
>  RewriteRule ^/(.*)  http://<%= servername %>/$1 [L,R=301]
>  <% end %>
> [...]
> ------------------------------->8---------------------------------
>
> ... will result in the following output:
>
> -------------------------------8<---------------------------------
> RewriteCond %{HTTP_HOST}   ^vhost\.alias1\.tld [OR]
> RewriteCond %{HTTP_HOST}   ^vhost\.alias2\.tld [OR]
> RewriteRule ^/(.*)         http://target.website.tld/$1 [L,R=301]
> ------------------------------->8---------------------------------
>
> Because of the additional ''[OR]'' parameter at the end of
the second line an
> endless loop is being created crashing all vhosts. Does anybody have an
> idea on how to deal with this?
Try vhostaliases_regex.collect{ |val| "RewriteCond %{HTTP_HOST}
#{val}"}.join(" [OR]\n")
> vhostaliases_regex = [''alias1'',
''alias2'']
=> ["alias1", "alias2"]
> val = vhostaliases_regex.collect{ |val| "RewriteCond %{HTTP_HOST}
#{val}"}.join(" [OR]\n")
=> "RewriteCond %{HTTP_HOST} alias1 [OR]\nRewriteCond %{HTTP_HOST}
alias2"
> puts val
RewriteCond %{HTTP_HOST} alias1 [OR]
RewriteCond %{HTTP_HOST} alias2
=> nil

Thanks,

Nan

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Hi Nan,

On 10/25/2011 07:57 PM Nan Liu wrote:

[...]
>> Because of the additional ''[OR]'' parameter at the end
of the second line an
>> endless loop is being created crashing all vhosts. Does anybody have an
>> idea on how to deal with this?
> 
> Try vhostaliases_regex.collect{ |val| "RewriteCond %{HTTP_HOST}
> #{val}"}.join(" [OR]\n")
> 
>> vhostaliases_regex = [''alias1'',
''alias2'']
> => ["alias1", "alias2"]
>> val = vhostaliases_regex.collect{ |val| "RewriteCond %{HTTP_HOST}
#{val}"}.join(" [OR]\n")
> => "RewriteCond %{HTTP_HOST} alias1 [OR]\nRewriteCond %{HTTP_HOST}
alias2"
>> puts val
> RewriteCond %{HTTP_HOST} alias1 [OR]
> RewriteCond %{HTTP_HOST} alias2
> => nil
why things cannot be always that easy.. that''s the snippet of erb code
I
made up:

--------------------------------8<---------------------------------------
<% if vhostaliases_regex != "" then -%>
<% vhostaliases_new = vhostaliases_regex.collect{ |val| "RewriteCond
%{HTTP_HOST} #{val}"}.join(" [OR]\n  ") %>
<% vhostaliases_new.each do |Alias| %><%= Alias %><% end %>
RewriteRule ^/(.*)  http://<%= servername %>/$1 [L,R=301]
<% end -%>
-------------------------------->8---------------------------------------

Thanks :)

- Jan