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# -*- Mode: perl; indent-tabs-mode: nil -*-
#
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is the Bugzilla Bug Tracking System.
#
# The Initial Developer of the Original Code is Everything Solved, Inc.
# Portions created by the Initial Developer are Copyright (C) 2008
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
# Max Kanat-Alexander <mkanat@bugzilla.org>
package Bugzilla::WebService::Util;
use strict;
use base qw(Exporter);
# We have to "require", not "use" this, because otherwise it tries to
# use features of Test::More during import().
require Test::Taint;
our @EXPORT_OK = qw(
filter
filter_wants
taint_data
validate
);
sub filter ($$;$) {
my ($params, $hash, $prefix) = @_;
my %newhash = %$hash;
foreach my $key (keys %$hash) {
delete $newhash{$key} if !filter_wants($params, $key, $prefix);
}
return \%newhash;
}
sub filter_wants ($$;$) {
my ($params, $field, $prefix) = @_;
my %include = map { $_ => 1 } @{ $params->{'include_fields'} || [] };
my %exclude = map { $_ => 1 } @{ $params->{'exclude_fields'} || [] };
$field = "${prefix}.${field}" if $prefix;
if (defined $params->{exclude_fields} && $exclude{$field}) {
return 0;
}
if (defined $params->{include_fields} && !$include{$field}) {
if ($prefix) {
# Include the field if the parent is include (and this one is not excluded)
return 0 if !$include{$prefix};
}
else {
# We want to include this if one of the sub keys is included
my $key = $field . '.';
my $len = length($key);
return 0 if ! grep { substr($_, 0, $len) eq $key } keys %include;
}
}
return 1;
}
sub taint_data {
my @params = @_;
return if !@params;
# Though this is a private function, it hasn't changed since 2004 and
# should be safe to use, and prevents us from having to write it ourselves
# or require another module to do it.
Test::Taint::_deeply_traverse(\&_delete_bad_keys, \@params);
Test::Taint::taint_deeply(\@params);
}
sub _delete_bad_keys {
foreach my $item (@_) {
next if ref $item ne 'HASH';
foreach my $key (keys %$item) {
# Making something a hash key always untaints it, in Perl.
# However, we need to validate our argument names in some way.
# We know that all hash keys passed in to the WebService will
# match \w+, so we delete any key that doesn't match that.
if ($key !~ /^\w+$/) {
delete $item->{$key};
}
}
}
return @_;
}
sub validate {
my ($self, $params, @keys) = @_;
# If $params is defined but not a reference, then we weren't
# sent any parameters at all, and we're getting @keys where
# $params should be.
return ($self, undef) if (defined $params and !ref $params);
# If @keys is not empty then we convert any named
# parameters that have scalar values to arrayrefs
# that match.
foreach my $key (@keys) {
if (exists $params->{$key}) {
$params->{$key} = ref $params->{$key}
? $params->{$key}
: [ $params->{$key} ];
}
}
return ($self, $params);
}
__END__
=head1 NAME
Bugzilla::WebService::Util - Utility functions used inside of the WebService
code. These are B<not> functions that can be called via the WebService.
=head1 DESCRIPTION
This is somewhat like L<Bugzilla::Util>, but these functions are only used
internally in the WebService code.
=head1 SYNOPSIS
filter({ include_fields => ['id', 'name'],
exclude_fields => ['name'] }, $hash);
my $wants = filter_wants $params, 'field_name';
validate(@_, 'ids');
=head1 METHODS
=head2 filter
This helps implement the C<include_fields> and C<exclude_fields> arguments
of WebService methods. Given a hash (the second argument to this subroutine),
this will remove any keys that are I<not> in C<include_fields> and then remove
any keys that I<are> in C<exclude_fields>.
An optional third option can be passed that prefixes the field name to allow
filtering of data two or more levels deep.
For example, if you want to filter out the C<id> key/value in components returned
by Product.get, you would use the value C<component.id> in your C<exclude_fields>
list.
=head2 filter_wants
Returns C<1> if a filter would preserve the specified field when passing
a hash to L</filter>, C<0> otherwise.
=head2 validate
This helps in the validation of parameters passed into the WebService
methods. Currently it converts listed parameters into an array reference
if the client only passed a single scalar value. It modifies the parameters
hash in place so other parameters should be unaltered.
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