Support for AliasMatch directives

[antaflos]

Since the Alias directive does not support matching regular expressions using something like Alias ~ ^/git/(.*...)$ ... one has to use AliasMatch instead, which currently isn't supported by the puppetlabs-apache module:

Example:

AliasMatch ^/git/(.*/objects/[0-9a-f]{2}/[0-9a-f]{38})$          /srv/git/repositories/$1
AliasMatch ^/git/(.*/objects/pack/pack-[0-9a-f]{40}.(pack|idx))$ /srv/git/repositories/$1

[antaflos]

If I understand http://httpd.apache.org/docs/2.2/mod/mod_alias.html correctly the Alias and AliasMatch directives are equivalent, with the difference that AliasMatch allows for regular expressions. This means the order of processing does not differentiate between Alias and AliasMatch so these directives are processed in the order in which they appear in the configuration file.

Since the order of processing is important it follows that to support AliasMatch we have to extend https://github.com/puppetlabs/puppetlabs-apache#aliases and https://github.com/puppetlabs/puppetlabs-apache/blob/master/templates/vhost/_aliases.erb so that the template can create AliasMatch directives where requested.

I suppose this has to look like this (contrived) example in the end:

aliases => [
  { alias      => '/foo/bar',           path => '/baz' },
  { aliasmatch => '^/icons(.*)',        path => '/usr/local/apache/icons$1' },
  { alias      => '/foo',               path => '/gaq' },
  { aliasmatch => '^/image/(.*)\.gif$', path => '/files/gifs/$1.gif' },
  ...
]

The same goes for ScriptAlias support (issue #480).

[igalic]

This goes also for ProxyPass (and ProxyPassMatch).

[igalic]

Implemented by #483