mod_perl-2.0.11::docs::api::Apache2::CmdParms(3)

NAME
Apache2::CmdParms - Perl API for Apache command parameters object

Synopsis
  use Apache2::CmdParms ();
  use Apache2::Module ();
  use Apache2::Const -compile => qw(NOT_IN_LOCATION);

  my @directives = (
    {
      name => 'MyDirective',
      cmd_data => 'some extra data',
    },
  );

  Apache2::Module::add(__PACKAGE__, \@directives);

  sub MyDirective {
      my ($self, $parms, $args) = @_;

      # push config
      $parms->add_config(['ServerTokens off']);

      # this command's command object
      $cmd = $parms->cmd;

      # check the current command's context
      $error = $parms->check_cmd_context(Apache2::Const::NOT_IN_LOCATION);

      # this command's context
      $context = $parms->context;

      # this command's directive object
      $directive = $parms->directive;

      # the extra information passed thru cmd_data to
      # Apache2::Module::add()
      $info = $parms->info;

      # which methods are <Limit>ed ?
      $is_limited = $parms->method_is_limited('GET');

      # which allow-override bits are set
      $override = $parms->override;

      # which Options are allowed by AllowOverride (since Apache 2.2)
      $override = $parms->override_opts;

      # the path this command is being invoked in
      $path = $parms->path;

      # this command's pool
      $p = $parms->pool;

      # this command's configuration time pool
      $p = $parms->temp_pool;
  }

Description
"Apache2::CmdParms" provides the Perl API for Apache command parameters object.

API
"Apache2::CmdParms" provides the following functions and/or methods:

  "add_config"
Dynamically add Apache configuration at request processing runtime:

  $parms->add_config($lines);

obj: $parms ( "Apache2::CmdParms object" )
arg1: $lines (ARRAY ref)
    An ARRAY reference containing configuration lines per element, without the new line terminators.

ret: no return value
since: 2.0.00

See also: "$s->add_config", "$r->add_config"

  "check_cmd_context"
Check the current command against a context bitmask of forbidden contexts.

  $error = $parms->check_cmd_context($check);

obj: $parms ( "Apache2::CmdParms object" )
arg1: $check ( "Apache2::Const :context constant" )
    the context to check against.

ret: $error ( string / undef )
    If the context is forbidden, this method returns a textual description of why it was forbidden. If the context is permitted, this method returns "undef".

since: 2.0.00

For example here is how to check whether a command is allowed in the "<Location>" container:

  use Apache2::Const -compile qw(NOT_IN_LOCATION);
  if (my $error = $parms->check_cmd_context(Apache2::Const::NOT_IN_LOCATION)) {
      die "directive ... not allowed in <Location> context"
  }

  "cmd"
This module's command information

  $cmd = $parms->cmd();

obj: $parms ( "Apache2::CmdParms object" )
ret: $cmd ( "Apache2::Command object" )
since: 2.0.00

  "directive"
This command's directive object in the configuration tree

  $directive = $parms->directive;

obj: $parms ( "Apache2::CmdParms object" )
ret: $directive ( "Apache2::Directive object" )
    The current directive node in the configuration tree

since: 2.0.00

  "info"
The extra information passed through "cmd_data" in "Apache2::Module::add()".

  $info = $parms->info;

obj: $parms ( "Apache2::CmdParms object" )
ret: $info ( string )
    The string passed in "cmd_data"

since: 2.0.00

For example here is how to pass arbitrary information to a directive subroutine:

  my @directives = (
    {
      name => 'MyDirective1',
      func => \&MyDirective,
      cmd_data => 'One',
    },
    {
      name => 'MyDirective2',
      func => \&MyDirective,
      cmd_data => 'Two',
    },
  );
  Apache2::Module::add(__PACKAGE__, \@directives);

  sub MyDirective {
    my ($self, $parms, $args) = @_;
    my $info = $parms->info;
  }

In this example $info will either be 'One' or 'Two' depending on whether the directive was called as MyDirective1 or MyDirective2.

  "method_is_limited"
Discover if a method is <Limit>ed in the current scope

  $is_limited = $parms->method_is_limited($method);

obj: $parms ( "Apache2::CmdParms object" )
arg1: $method (string)
    The name of the method to check for

ret: $is_limited ( boolean )
since: 2.0.00

For example, to check if the "GET" method is being "<Limit>"ed in the current scope, do:

  if ($parms->method_is_limited('GET') {
      die "...";
  }

  "override"
Which allow-override bits are set ("AllowOverride" directive)

  $override = $parms->override;

obj: $parms ( "Apache2::CmdParms object" )
ret: $override ( bitmask )
    the allow-override bits bitmask, which can be tested against "Apache2::Const :override constants".

since: 2.0.00

For example to check that the "AllowOverride"'s "AuthConfig" and "FileInfo" options are enabled for this command, do:

  use Apache2::Const -compile qw(:override);
  $wanted = Apache2::Const::OR_AUTHCFG | Apache2::Const::OR_FILEINFO;
  $masked = $parms->override & $wanted;
  unless ($wanted == $masked) {
      die "...";
  }

  "override_opts"
Which options are allowed to be overridden by ".htaccess" files. This is set by "AllowOverride Options=...".

  $override_opts = $parms->override_opts;

Enabling single options was introduced with Apache 2.2. For Apache 2.0 this function simply returns a bitmask with all options allowed.

obj: $parms ( "Apache2::CmdParms object" )
ret: $override_opts ( bitmask )
    the bitmask, which can be tested against "Apache2::Const :options constants".

since: 2.0.3

  "path"
The current pathname/location/match of the block this command is in

  $path = $parms->path;

obj: $parms ( "Apache2::CmdParms object" )
ret: $path ( string / "undef" )
    If configuring for a block like <Location>, <LocationMatch>, <Directory>, etc., the pathname part of that directive. Otherwise, "undef" is returned.

since: 2.0.00

For example for a container block:

  <Location /foo>
  ...
  </Location>

'/foo' will be returned.

  "pool"
Pool associated with this command

  $p = $parms->pool;

obj: $parms ( "Apache2::CmdParms object" )
ret: $p ( "APR::Pool object" )
since: 2.0.00

  "server"
The (vhost) server this command was defined in httpd.conf

  $s = $parms->server;

obj: $parms ( "Apache2::CmdParms object" )
ret: $s ( "Apache2::Server object" )
since: 2.0.00

  "temp_pool"
Pool for scratch memory; persists during configuration, but destroyed before the first request is served.

  $temp_pool = $parms->temp_pool;

obj: $parms ( "Apache2::CmdParms object" )
ret: $temp_pool ( "APR::Pool object" )
since: 2.0.00

Most likely you shouldn't use this pool object, unless you know what you are doing. Use "$parms->pool" instead.

Unsupported API
"Apache2::CmdParms" also provides auto-generated Perl interface for a few other methods which aren't tested at the moment and therefore their API is a subject to change. These methods will be finalized later as a need arises. If you want to rely on any of the following methods please contact the the mod_perl development mailing list so we can help each other take the steps necessary to shift the method to an officially supported API.

  "context"
Get context containing pointers to modules' per-dir config structures.

  $context = $parms->context;

obj: $parms ( "Apache2::CmdParms object" )
ret: $newval ( "Apache2::ConfVector object" )
    Returns the commands' per-dir config structures

since: 2.0.00

See Also
mod_perl 2.0 documentation.

Copyright
mod_perl 2.0 and its core modules are copyrighted under The Apache Software License, Version 2.0.

Authors
The mod_perl development team and numerous contributors.