File Coverage

blib/lib/Config/General/Interpolated.pm

Criterion	Covered	Total	%
statement	59	85	69.4
branch	16	34	47.0
condition			n/a
subroutine	10	13	76.9
pod	1	1	100.0
total	86	133	64.6

#
# Config::General::Interpolated - special Class based on Config::General
#
# Copyright (c) 2001 by Wei-Hon Chen .
# Copyright (c) 2000-2022 by Thomas Linden .
# All Rights Reserved. Std. disclaimer applies.
# Licensed under the terms of the Artistic License 2.0.
#

package Config::General::Interpolated;
$Config::General::Interpolated::VERSION = "2.16";

use strict;
use Carp;
use Config::General;
use Exporter ();


# Import stuff from Config::General
use vars qw(@ISA @EXPORT);
@ISA = qw(Config::General Exporter);


sub new {
  #
  # overwrite new() with our own version
  # and call the parent class new()
  #

  croak "Deprecated method Config::General::Interpolated::new() called.\n"
       ."Use Config::General::new() instead and set the -InterPolateVars flag.\n";
}



sub _set_regex {
  #
  # set the regex for finding vars
  #

  # the following regex is provided by Autrijus Tang
  # , and I made some modifications.
  # thanx, autrijus. :)
  my $regex = qr{
		 (^|\G|[^\\])   # $1: can be the beginning of the line
		                #     or the beginning of next match
		                #     but can't begin with a '\'
		 \$		# dollar sign
		 (\{)?		# $2: optional opening curly
         ([a-zA-Z0-9][a-zA-Z0-9_\-\.:\+]*) # $3: capturing variable name (fix of #33447+118746)
		 (?(2)		# $4: if there's the opening curly...
		 \}		#     ... match closing curly
		)
	       }x;
  return $regex;
}


sub _interpolate  {
  #
  # interpolate a scalar value and keep the result
  # on the varstack.
  #
  # called directly by Config::General::_parse_value()
  #
  my ($this, $config, $key, $value) = @_;
  my $quote_counter = 100;

  # some dirty trick to circumvent single quoted vars to be interpolated
  # we remove all quotes and replace them with unique random literals,
  # which will be replaced after interpolation with the original quotes
  # fixes bug rt#35766
  my %quotes;

  if(! $this->{AllowSingleQuoteInterpolation} ) {
    $value =~ s/(\'[^\']+?\')/
      my $key = "QUOTE" . ($quote_counter++) . "QUOTE";
      $quotes{ $key } = $1;
      $key;
    /gex;
  }

  $value =~ s{$this->{regex}}{
    my $con = $1;
    my $var = $3;
    my $var_lc = $this->{LowerCaseNames} ? lc($var) : $var;

    if (exists $config->{__stack}->{$var_lc}) {
      $con . $config->{__stack}->{$var_lc};
    }
    elsif ($this->{InterPolateEnv}) {
      # may lead to vulnerabilities, by default flag turned off
      if (defined($ENV{$var})) {
	$con . $ENV{$var};
      }
      else {
	$con;
      }
    }
    elsif ($this->{StrictVars}) {
      croak "Use of uninitialized variable (\$$var) while loading config entry: $key = $value\n";
    }
    else {
      # be cool
      $con;
    }
  }egx;

  # re-insert unaltered quotes
  # fixes bug rt#35766
  foreach my $quote (keys %quotes) {
    $value =~ s/$quote/$quotes{$quote}/;
  }

  return $value;
};


sub _interpolate_hash {
  #
  # interpolate a complete hash and keep the results
  # on the varstack.
  #
  # called directly by Config::General::new()
  #
  my ($this, $config) = @_;

  # bugfix rt.cpan.org#46184, moved code from _interpolate() to here.
  if ($this->{InterPolateEnv}) {
    # may lead to vulnerabilities, by default flag turned off
    for my $key (keys %ENV){
      $config->{__stack}->{$key}=$ENV{$key};
    }
  }

  $config = $this->_var_hash_stacker($config);

  return $config;
}

sub _var_hash_stacker {
  #
  # build a varstack of a given hash ref
  #
  my ($this, $config) = @_;

  foreach my $key (keys %{$config}) {
    next if($key eq "__stack");
    if (ref($config->{$key}) eq "ARRAY" ) {
      $config->{$key} = $this->_var_array_stacker($config->{$key}, $key);
    }
    elsif (ref($config->{$key}) eq "HASH") {
      my $tmphash = $config->{$key};
      $tmphash->{__stack} = $config->{__stack};
      $config->{$key} = $this->_var_hash_stacker($tmphash);
    }
    else {
      # SCALAR
      $config->{__stack}->{$key} = $config->{$key};
    }
  }

  return $config;
}


sub _var_array_stacker {
  #
  # same as _var_hash_stacker but for arrayrefs
  #
  my ($this, $config, $key) = @_;

  my @new;

  foreach my $entry (@{$config}) {
    if (ref($entry) eq "HASH") {
      $entry = $this->_var_hash_stacker($entry);
    }
    elsif (ref($entry) eq "ARRAY") {
      # ignore this. Arrays of Arrays cannot be created/supported
      # with Config::General, because they are not accessible by
      # any key (anonymous array-ref)
      next;
    }
    else {
      #### $config->{__stack}->{$key} = $config->{$key};
      # removed. a array of scalars (eg: option = [1,2,3]) cannot
      # be used for interpolation (which one shall we use?!), so
      # we ignore those types of lists.
      # found by fbicknel, fixes rt.cpan.org#41570
    }
    push @new, $entry;
  }

  return  \@new;
}

sub _clean_stack {
  #
  # recursively empty the variable stack
  #
  my ($this, $config) = @_;
  #return $config; # DEBUG
  foreach my $key (keys %{$config}) {
    if ($key eq "__stack") {
      delete $config->{__stack};
      next;
    }
    if (ref($config->{$key}) eq "ARRAY" ) {
      $config->{$key} = $this->_clean_array_stack($config->{$key});
    }
    elsif (ref($config->{$key}) eq "HASH") {
      $config->{$key} = $this->_clean_stack($config->{$key});
    }
  }
  return $config;
}


sub _clean_array_stack {
  #
  # same as _var_hash_stacker but for arrayrefs
  #
  my ($this, $config) = @_;

  my @new;

  foreach my $entry (@{$config}) {
    if (ref($entry) eq "HASH") {
      $entry = $this->_clean_stack($entry);
    }
    elsif (ref($entry) eq "ARRAY") {
      # ignore this. Arrays of Arrays cannot be created/supported
      # with Config::General, because they are not accessible by
      # any key (anonymous array-ref)
      next;
    }
    push @new, $entry;
  }

  return  \@new;
}

1;

__END__