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    Refer to SVN documentation for syntax of the authz file. Groups are
    supported.

    As the fine-grained permissions brought by this permission policy are
    often used in complement of the other permission policies (like the
    `DefaultPermissionPolicy`), there's no need to redefine all the
    permissions here. Only additional rights or restrictions should be added.

    === Installation ===
    Enabling this policy requires listing it in `trac.ini`::

      {{{
      [trac]
      permission_policies = AuthzPolicy, DefaultPermissionPolicy

      [authz_policy]
      authz_file = conf/authzpolicy.conf
      }}}

    This means that the `AuthzPolicy` permissions will be checked first, and
    only if no rule is found will the `DefaultPermissionPolicy` be used.


    === Configuration ===
    The `authzpolicy.conf` file is a `.ini` style configuration file.

     - Each section of the config is a glob pattern used to match against a
       Trac resource descriptor. These descriptors are in the form::

         {{{
         <realm>:<id>@<version>[/<realm>:<id>@<version> ...]
         }}}

       Resources are ordered left to right, from parent to child. If any
       component is inapplicable, `*` is substituted. If the version pattern is
       not specified explicitely, all versions (`@*`) is added implicitly

       Example: Match the WikiStart page::

         {{{
         [wiki:*]
         [wiki:WikiStart*]
         [wiki:WikiStart@*]
         [wiki:WikiStart]
         }}}

       Example: Match the attachment
       ``wiki:WikiStart@117/attachment/FOO.JPG@*`` on WikiStart::

         {{{
         [wiki:*]
         [wiki:WikiStart*]
         [wiki:WikiStart@*]
         [wiki:WikiStart@*/attachment/*]
         [wiki:WikiStart@117/attachment/FOO.JPG]
         }}}

     - Sections are checked against the current Trac resource '''IN ORDER''' of
       appearance in the configuration file. '''ORDER IS CRITICAL'''.

     - Once a section matches, the current username is matched, '''IN ORDER''',
       against the keys of the section. If a key is prefixed with a `@`, it is
       treated as a group. If a key is prefixed with a `!`, the permission is
       denied rather than granted. The username will match any of 'anonymous',
       'authenticated', <username> or '*', using normal Trac permission rules.

    Example configuration::

      {{{
      [groups]
      administrators = athomas

      [*/attachment:*]
      * = WIKI_VIEW, TICKET_VIEW

      [wiki:WikiStart@*]
      @administrators = WIKI_ADMIN
      anonymous = WIKI_VIEW
      * = WIKI_VIEW

      # Deny access to page templates
      [wiki:PageTemplates/*]
      * =

      # Match everything else
      [*]
      @administrators = TRAC_ADMIN
      anonymous = BROWSER_VIEW, CHANGESET_VIEW, FILE_VIEW, LOG_VIEW,
          MILESTONE_VIEW, POLL_VIEW, REPORT_SQL_VIEW, REPORT_VIEW,
          ROADMAP_VIEW, SEARCH_VIEW, TICKET_CREATE, TICKET_MODIFY,
          TICKET_VIEW, TIMELINE_VIEW,
          WIKI_CREATE, WIKI_MODIFY, WIKI_VIEW
      # Give authenticated users some extra permissions
      authenticated = REPO_SEARCH, XML_RPC
      }}}

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