# $Id$ # # This is free software, you may use it and distribute it under the same terms as # Perl itself. # # Copyright 2001-2009 AxKit.com Ltd. # # package XML::LibXSLT; use strict; use warnings; use 5.008; use vars qw($VERSION @ISA $USE_LIBXML_DATA_TYPES $MatchCB $ReadCB $OpenCB $CloseCB); sub REQUIRE_XML_LIBXML_ABI_VERSION { 2 } use XML::LibXML 1.70; use XML::LibXML::Literal; use XML::LibXML::Boolean; use XML::LibXML::Number; use XML::LibXML::NodeList; BEGIN { use Carp; require Exporter; $VERSION = '2.002001'; require DynaLoader; @ISA = qw(DynaLoader); # avoid possible shared library name conflict on Win32 # not using this trick on 5.10.0 (suffering from DynaLoader bug) local $DynaLoader::dl_dlext = "xs.$DynaLoader::dl_dlext" if ( ( $^O eq 'MSWin32' ) && ( $] ne '5.010000' ) ); bootstrap XML::LibXSLT $VERSION; # the following magic lets XML::LibXSLT internals know # where to register XML::LibXML proxy nodes INIT_THREAD_SUPPORT() if XML::LibXML::threads_shared_enabled(); $USE_LIBXML_DATA_TYPES = 0; } sub new { my $class = shift; my %options = @_; my $self = bless \%options, $class; return $self; } # ido - perl dispatcher sub perl_dispatcher { my $func = shift; my $owner_doc = shift; my @params = @_; my @perlParams; my $i = 0; while (@params) { my $type = shift(@params); if ( $type eq 'XML::LibXML::Literal' or $type eq 'XML::LibXML::Number' or $type eq 'XML::LibXML::Boolean' ) { my $val = shift(@params); unshift( @perlParams, $USE_LIBXML_DATA_TYPES ? $type->new($val) : $val ); } elsif ( $type eq 'XML::LibXML::NodeList' ) { my $node_count = shift(@params); my @nodes = splice( @params, 0, $node_count ); # warn($_->getName) for @nodes; unshift( @perlParams, $type->new(@nodes) ); } } $func = "main::$func" unless ref($func) || $func =~ /(.+)::/; no strict 'refs'; my $res = $func->(@perlParams); return $res; } sub xpath_to_string { my @results; while (@_) { my $value = shift(@_); $value = '' unless defined $value; push @results, $value; if ( @results % 2 ) { # key $results[-1] =~ s/:/_/g; # XSLT doesn't like names with colons } else { if ( $value =~ s/'/', "'", '/g ) { $results[-1] = "concat('$value')"; } else { $results[-1] = "'$results[-1]'"; } } } return @results; } #-------------------------------------------------------------------------# # callback functions # #-------------------------------------------------------------------------# sub security_callbacks { my $self = shift; my $scbclass = shift; if ( defined $scbclass ) { $self->{XML_LIBXSLT_SECPREFS} = $scbclass; } return $self->{XML_LIBXSLT_SECPREFS}; } sub input_callbacks { my $self = shift; my $icbclass = shift; if ( defined $icbclass ) { $self->{XML_LIBXSLT_CALLBACK_STACK} = $icbclass; } return $self->{XML_LIBXSLT_CALLBACK_STACK}; } sub match_callback { my $self = shift; if ( ref $self ) { if ( scalar @_ ) { $self->{XML_LIBXSLT_MATCH_CB} = shift; $self->{XML_LIBXSLT_CALLBACK_STACK} = undef; } return $self->{XML_LIBXSLT_MATCH_CB}; } else { $MatchCB = shift if scalar @_; return $MatchCB; } } sub read_callback { my $self = shift; if ( ref $self ) { if ( scalar @_ ) { $self->{XML_LIBXSLT_READ_CB} = shift; $self->{XML_LIBXSLT_CALLBACK_STACK} = undef; } return $self->{XML_LIBXSLT_READ_CB}; } else { $ReadCB = shift if scalar @_; return $ReadCB; } } sub close_callback { my $self = shift; if ( ref $self ) { if ( scalar @_ ) { $self->{XML_LIBXSLT_CLOSE_CB} = shift; $self->{XML_LIBXSLT_CALLBACK_STACK} = undef; } return $self->{XML_LIBXSLT_CLOSE_CB}; } else { $CloseCB = shift if scalar @_; return $CloseCB; } } sub open_callback { my $self = shift; if ( ref $self ) { if ( scalar @_ ) { $self->{XML_LIBXSLT_OPEN_CB} = shift; $self->{XML_LIBXSLT_CALLBACK_STACK} = undef; } return $self->{XML_LIBXSLT_OPEN_CB}; } else { $OpenCB = shift if scalar @_; return $OpenCB; } } sub callbacks { my $self = shift; if ( ref $self ) { if (@_) { my ( $match, $open, $read, $close ) = @_; @{$self}{ qw(XML_LIBXSLT_MATCH_CB XML_LIBXSLT_OPEN_CB XML_LIBXSLT_READ_CB XML_LIBXSLT_CLOSE_CB) } = ( $match, $open, $read, $close ); $self->{XML_LIBXSLT_CALLBACK_STACK} = undef; } else { return @{$self}{ qw(XML_LIBXSLT_MATCH_CB XML_LIBXSLT_OPEN_CB XML_LIBXSLT_READ_CB XML_LIBXSLT_CLOSE_CB) }; } } else { if (@_) { ( $MatchCB, $OpenCB, $ReadCB, $CloseCB ) = @_; } else { return ( $MatchCB, $OpenCB, $ReadCB, $CloseCB ); } } } sub _init_callbacks { my $self = shift; my $icb = $self->{XML_LIBXSLT_CALLBACK_STACK}; unless ( defined $icb ) { $self->{XML_LIBXSLT_CALLBACK_STACK} = XML::LibXML::InputCallback->new(); $icb = $self->{XML_LIBXSLT_CALLBACK_STACK}; } my $mcb = $self->match_callback(); my $ocb = $self->open_callback(); my $rcb = $self->read_callback(); my $ccb = $self->close_callback(); if ( defined $mcb and defined $ocb and defined $rcb and defined $ccb ) { $icb->register_callbacks( [ $mcb, $ocb, $rcb, $ccb ] ); } $icb->init_callbacks(); } sub _cleanup_callbacks { my $self = shift; $self->{XML_LIBXSLT_CALLBACK_STACK}->cleanup_callbacks(); my $mcb = $self->match_callback(); if ( defined $mcb ) { $self->{XML_LIBXSLT_CALLBACK_STACK}->unregister_callbacks( [$mcb] ); } } sub parse_stylesheet { my $self = shift; $self->_init_callbacks(); my $stylesheet; eval { $stylesheet = $self->_parse_stylesheet(@_); }; $self->_cleanup_callbacks(); my $err = $@; if ($err) { croak $err; } my $rv = { XML_LIBXSLT_STYLESHEET => $stylesheet, XML_LIBXSLT_CALLBACK_STACK => $self->{XML_LIBXSLT_CALLBACK_STACK}, XML_LIBXSLT_MATCH_CB => $self->{XML_LIBXSLT_MATCH_CB}, XML_LIBXSLT_OPEN_CB => $self->{XML_LIBXSLT_OPEN_CB}, XML_LIBXSLT_READ_CB => $self->{XML_LIBXSLT_READ_CB}, XML_LIBXSLT_CLOSE_CB => $self->{XML_LIBXSLT_CLOSE_CB}, XML_LIBXSLT_SECPREFS => $self->{XML_LIBXSLT_SECPREFS}, XML_LIBXSLT_FUNCTIONS => {}, XML_LIBXSLT_ELEMENTS => {}, }; return bless $rv, "XML::LibXSLT::StylesheetWrapper"; } sub parse_stylesheet_file { my $self = shift; $self->_init_callbacks(); my $stylesheet; eval { $stylesheet = $self->_parse_stylesheet_file(@_); }; $self->_cleanup_callbacks(); my $err = $@; if ($err) { croak $err; } my $rv = { XML_LIBXSLT_STYLESHEET => $stylesheet, XML_LIBXSLT_CALLBACK_STACK => $self->{XML_LIBXSLT_CALLBACK_STACK}, XML_LIBXSLT_MATCH_CB => $self->{XML_LIBXSLT_MATCH_CB}, XML_LIBXSLT_OPEN_CB => $self->{XML_LIBXSLT_OPEN_CB}, XML_LIBXSLT_READ_CB => $self->{XML_LIBXSLT_READ_CB}, XML_LIBXSLT_CLOSE_CB => $self->{XML_LIBXSLT_CLOSE_CB}, XML_LIBXSLT_SECPREFS => $self->{XML_LIBXSLT_SECPREFS}, XML_LIBXSLT_FUNCTIONS => {}, XML_LIBXSLT_ELEMENTS => {}, }; return bless $rv, "XML::LibXSLT::StylesheetWrapper"; } sub register_xslt_module { my $self = shift; my $module = shift; # Not implemented } 1; package XML::LibXSLT::StylesheetWrapper; use strict; use vars qw($MatchCB $ReadCB $OpenCB $CloseCB); use XML::LibXML; use Carp; sub security_callbacks { my $self = shift; my $scbclass = shift; if ( defined $scbclass ) { $self->{XML_LIBXSLT_SECPREFS} = $scbclass; } return $self->{XML_LIBXSLT_SECPREFS}; } sub input_callbacks { my $self = shift; my $icbclass = shift; if ( defined $icbclass ) { $self->{XML_LIBXSLT_CALLBACK_STACK} = $icbclass; } return $self->{XML_LIBXSLT_CALLBACK_STACK}; } sub match_callback { my $self = shift; if ( ref $self ) { if ( scalar @_ ) { $self->{XML_LIBXSLT_MATCH_CB} = shift; $self->{XML_LIBXSLT_CALLBACK_STACK} = undef; } return $self->{XML_LIBXSLT_MATCH_CB}; } else { $MatchCB = shift if scalar @_; return $MatchCB; } } sub read_callback { my $self = shift; if ( ref $self ) { if ( scalar @_ ) { $self->{XML_LIBXSLT_READ_CB} = shift; $self->{XML_LIBXSLT_CALLBACK_STACK} = undef; } return $self->{XML_LIBXSLT_READ_CB}; } else { $ReadCB = shift if scalar @_; return $ReadCB; } } sub close_callback { my $self = shift; if ( ref $self ) { if ( scalar @_ ) { $self->{XML_LIBXSLT_CLOSE_CB} = shift; $self->{XML_LIBXSLT_CALLBACK_STACK} = undef; } return $self->{XML_LIBXSLT_CLOSE_CB}; } else { $CloseCB = shift if scalar @_; return $CloseCB; } } sub open_callback { my $self = shift; if ( ref $self ) { if ( scalar @_ ) { $self->{XML_LIBXSLT_OPEN_CB} = shift; $self->{XML_LIBXSLT_CALLBACK_STACK} = undef; } return $self->{XML_LIBXSLT_OPEN_CB}; } else { $OpenCB = shift if scalar @_; return $OpenCB; } } sub callbacks { my $self = shift; if ( ref $self ) { if (@_) { my ( $match, $open, $read, $close ) = @_; @{$self}{ qw(XML_LIBXSLT_MATCH_CB XML_LIBXSLT_OPEN_CB XML_LIBXSLT_READ_CB XML_LIBXSLT_CLOSE_CB) } = ( $match, $open, $read, $close ); $self->{XML_LIBXSLT_CALLBACK_STACK} = undef; } else { return @{$self}{ qw(XML_LIBXSLT_MATCH_CB XML_LIBXSLT_OPEN_CB XML_LIBXSLT_READ_CB XML_LIBXSLT_CLOSE_CB) }; } } else { if (@_) { ( $MatchCB, $OpenCB, $ReadCB, $CloseCB ) = @_; } else { return ( $MatchCB, $OpenCB, $ReadCB, $CloseCB ); } } } sub _init_callbacks { my $self = shift; my $icb = $self->{XML_LIBXSLT_CALLBACK_STACK}; unless ( defined $icb ) { $self->{XML_LIBXSLT_CALLBACK_STACK} = XML::LibXML::InputCallback->new(); $icb = $self->{XML_LIBXSLT_CALLBACK_STACK}; } my $mcb = $self->match_callback(); my $ocb = $self->open_callback(); my $rcb = $self->read_callback(); my $ccb = $self->close_callback(); if ( defined $mcb and defined $ocb and defined $rcb and defined $ccb ) { $icb->register_callbacks( [ $mcb, $ocb, $rcb, $ccb ] ); } $icb->init_callbacks(); my $scb = $self->{XML_LIBXSLT_SECPREFS}; if ($scb) { $scb->init_callbacks(); } } sub _cleanup_callbacks { my $self = shift; $self->{XML_LIBXSLT_CALLBACK_STACK}->cleanup_callbacks(); my $mcb = $self->match_callback(); if ( defined $mcb ) { $self->{XML_LIBXSLT_CALLBACK_STACK}->unregister_callbacks( [$mcb] ); } my $scb = $self->{XML_LIBXSLT_SECPREFS}; if ($scb) { $scb->cleanup_callbacks(); } } sub transform_into_chars { my $self = shift; return $self->output_as_chars( $self->transform(@_) ); } sub transform { my $self = shift; my $doc; $self->_init_callbacks(); eval { $doc = $self->{XML_LIBXSLT_STYLESHEET}->transform( $self, @_ ); }; $self->_cleanup_callbacks(); my $err = $@; if ($err) { croak $err; } return $doc; } sub transform_file { my $self = shift; my $doc; $self->_init_callbacks(); eval { $doc = $self->{XML_LIBXSLT_STYLESHEET}->transform_file( $self, @_ ); }; $self->_cleanup_callbacks(); my $err = $@; if ($err) { croak $err; } return $doc; } sub register_function { my $self = shift; $self->{XML_LIBXSLT_FUNCTIONS}->{"{$_[0]}$_[1]"} = [ @_[ 0, 1, 2 ] ]; } sub register_element { my $self = shift; $self->{XML_LIBXSLT_ELEMENTS}->{"{$_[0]}$_[1]"} = [ @_[ 0, 1, 2 ] ]; } sub output_string { shift->{XML_LIBXSLT_STYLESHEET}->_output_string( $_[0], 0 ); } sub output_as_bytes { shift->{XML_LIBXSLT_STYLESHEET}->_output_string( $_[0], 1 ); } sub output_as_chars { shift->{XML_LIBXSLT_STYLESHEET}->_output_string( $_[0], 2 ); } sub output_fh { shift->{XML_LIBXSLT_STYLESHEET}->output_fh(@_) } sub output_file { shift->{XML_LIBXSLT_STYLESHEET}->output_file(@_) } sub media_type { shift->{XML_LIBXSLT_STYLESHEET}->media_type(@_) } sub output_method { shift->{XML_LIBXSLT_STYLESHEET}->output_method(@_) } sub output_encoding { shift->{XML_LIBXSLT_STYLESHEET}->output_encoding(@_) } 1; # XML::LibXSLT::Security Interface # #-------------------------------------------------------------------------# package XML::LibXSLT::Security; use strict; use Carp; use vars qw(%OPTION_MAP %_GLOBAL_CALLBACKS); # Maps the option names used in the perl interface to the numeric values # used by libxslt. my %OPTION_MAP = ( read_file => 1, write_file => 2, create_dir => 3, read_net => 4, write_net => 5, ); %_GLOBAL_CALLBACKS = (); #-------------------------------------------------------------------------# # global callback # #-------------------------------------------------------------------------# sub _security_check { my $option = shift; my $retval = 1; if ( $option == 3 ) { $retval = 0; # Default create_dir to no access } if ( exists $_GLOBAL_CALLBACKS{$option} ) { $retval = $_GLOBAL_CALLBACKS{$option}->(@_); } return $retval; } #-------------------------------------------------------------------------# # member functions and methods # #-------------------------------------------------------------------------# sub new { my $class = shift; return bless { '_CALLBACKS' => {} }, $class; } # Add a callback for the given security option (read_file, write_file, # create_dir, read_net, write_net). # # To register a callback that handle network read requests: # $scb->register_callback( read_net => \&callback ); sub register_callback { my $self = shift; my $option = shift; my $callback = shift; unless ( exists $OPTION_MAP{$option} ) { croak "Invalid security option '$option'. Must be one of: " . join( ', ', keys %OPTION_MAP ) . "."; } if ( ref $callback eq 'CODE' ) { $self->{_CALLBACKS}{ $OPTION_MAP{$option} } = $callback; } else { croak "Invalid argument. The callback must be a reference to a subroutine"; } } # Removes the callback for the given security option. Causes the given option # to use the default security handler (which always allows the action). sub unregister_callback { my $self = shift; my $option = shift; unless ( exists $OPTION_MAP{$option} ) { croak "Invalid security option '$option'. Must be one of: " . join( ', ', keys %OPTION_MAP ) . "."; } delete $self->{_CALLBACKS}{ $OPTION_MAP{$option} }; } # make it so libxslt can use the callbacks sub init_callbacks { my $self = shift; %_GLOBAL_CALLBACKS = %{ $self->{_CALLBACKS} }; } # reset libxslt callbacks sub cleanup_callbacks { my $self = shift; %_GLOBAL_CALLBACKS = (); } 1; __END__ =head1 NAME XML::LibXSLT - Interface to the GNOME libxslt library =head1 SYNOPSIS use XML::LibXSLT; use XML::LibXML; my $xslt = XML::LibXSLT->new(); my $source = XML::LibXML->load_xml(location => 'foo.xml'); my $style_doc = XML::LibXML->load_xml(location=>'bar.xsl', no_cdata=>1); my $stylesheet = $xslt->parse_stylesheet($style_doc); my $results = $stylesheet->transform($source); print $stylesheet->output_as_bytes($results); =head1 DESCRIPTION This module is an interface to the GNOME project's libxslt. This is an extremely good XSLT engine, highly compliant and also very fast. I have tests showing this to be more than twice as fast as Sablotron. =head1 OPTIONS XML::LibXSLT has some global options. Note that these are probably not thread or even fork safe - so only set them once per process. Each one of these options can be called either as class methods, or as instance methods. However either way you call them, it still sets global options. Each of the option methods returns its previous value, and can be called without a parameter to retrieve the current value. =over =item max_depth XML::LibXSLT->max_depth(1000); This option sets the maximum recursion depth for a stylesheet. See the very end of section 5.4 of the XSLT specification for more details on recursion and detecting it. If your stylesheet or XML file requires seriously deep recursion, this is the way to set it. Default value is 250. =item max_vars XML::LibXSLT->max_vars(100_000); This option sets the maximum number of variables for a stylesheet. If your stylesheet or XML file requires many variables, this is the way to increase their limit. Default value is system-specific and may vary. =item debug_callback XML::LibXSLT->debug_callback($subref); Sets a callback to be used for debug messages. If you don't set this, debug messages will be ignored. =item register_function XML::LibXSLT->register_function($uri, $name, $subref); $stylesheet->register_function($uri, $name, $subref); Registers an XSLT extension function mapped to the given URI. For example: XML::LibXSLT->register_function("urn:foo", "bar", sub { scalar localtime }); Will register a C function in the C namespace (which you have to define in your XSLT using C) that will return the current date and time as a string: The time is: Parameters can be in whatever format you like. If you pass in a nodelist it will be a XML::LibXML::NodeList object in your perl code, but ordinary values (strings, numbers and booleans) will be ordinary perl scalars. If you wish them to be C, C and C values respectively then set the variable C<$XML::LibXSLT::USE_LIBXML_DATA_TYPES> to a true value. Return values can be a nodelist or a plain value - the code will just do the right thing. But only a single return value is supported (a list is not converted to a nodelist). =item register_element $stylesheet->register_element($uri, $name, $subref) Registers an XSLT extension element $name mapped to the given URI. For example: $stylesheet->register_element("urn:foo", "hello", sub { my $name = $_[2]->getAttribute( "name" ); return XML::LibXML::Text->new( "Hello, $name!" ); }); Will register a C element in the C namespace that returns a "Hello, X!" text node. You must define this namespace in your XSLT and include its prefix in the C list: The callback is passed the input document node as $_[1] and the stylesheet node as $_[2]. $_[0] is reserved for future use. =back =head1 API The following methods are available on the new XML::LibXSLT object: =over =item parse_stylesheet($stylesheet_doc) C<$stylesheet_doc> here is an XML::LibXML::Document object (see L) representing an XSLT file. This method will return a XML::LibXSLT::Stylesheet object, or undef on failure. If the XSLT is invalid, an exception will be thrown, so wrap the call to parse_stylesheet in an eval{} block to trap this. IMPORTANT: C<$stylesheet_doc> should not contain CDATA sections, otherwise libxslt may misbehave. The best way to assure this is to load the stylesheet with no_cdata flag, e.g. my $stylesheet_doc = XML::LibXML->load_xml(location=>"some.xsl", no_cdata=>1); =item parse_stylesheet_file($filename) Exactly the same as the above, but parses the given filename directly. =back =head1 Input Callbacks To define XML::LibXSLT or XML::LibXSLT::Stylesheet specific input callbacks, reuse the XML::LibXML input callback API as described in L. =over 4 =item input_callbacks($icb) Enable the callbacks in C<$icb> only for this XML::LibXSLT object. C<$icb> should be a C object. This will call C and C automatically during parsing or transformation. =back =head1 Security Callbacks To create security preferences for the transformation see L. Once the security preferences have been defined you can apply them to an XML::LibXSLT or XML::LibXSLT::Stylesheet instance using the C method. =head1 XML::LibXSLT::Stylesheet The main API is on the stylesheet, though it is fairly minimal. One of the main advantages of XML::LibXSLT is that you have a generic stylesheet object which you call the transform() method passing in a document to transform. This allows you to have multiple transformations happen with one stylesheet without requiring a reparse. =over =item transform(doc, %params) my $results = $stylesheet->transform($doc, foo => "'bar'"); print $stylesheet->output_as_bytes($results); Transforms the passed in XML::LibXML::Document object, and returns a new XML::LibXML::Document. Extra hash entries are used as parameters. Be sure to keep in mind the caveat with regard to quotes explained in the section on L below. =item transform_file(filename, %params) my $results = $stylesheet->transform_file($filename, bar => "'baz'"); Note the string parameter caveat, detailed in the section on L below. =item output_as_bytes(result) Returns a scalar that is the XSLT rendering of the XML::LibXML::Document object using the desired output format (specified in the xsl:output tag in the stylesheet). Note that you can also call $result->toString, but that will *always* output the document in XML format which may not be what you asked for in the xsl:output tag. The scalar is a byte string encoded in the output encoding specified in the stylesheet. =item output_as_chars(result) Like C, but always return the output as (UTF-8 encoded) string of characters. =item output_string(result) DEPRECATED: This method is something between C and C: The scalar returned by this function appears to Perl as characters (UTF8 flag is on) if the output encoding specified in the XSLT stylesheet was UTF-8 and as bytes if no output encoding was specified or if the output encoding was other than UTF-8. Since the behavior of this function depends on the particular stylesheet, it is deprecated in favor of C and C. =item output_fh(result, fh) Outputs the result to the filehandle given in C<$fh>. =item output_file(result, filename) Outputs the result to the file named in C<$filename>. =item output_encoding() Returns the output encoding of the results. Defaults to "UTF-8". =item output_method() Returns the value of the C attribute from C (usually C, C or C). If this attribute is unspecified, the default value is initially C. If the L method is used to produce an HTML document, as per the L, the default value will change to C. To override this behavior completely, supply an C element in the stylesheet source document. =item media_type() Returns the value of the C attribute from C. If this attribute is unspecified, the default media type is initially C. This default changes to C under the same conditions as L. =item input_callbacks($icb) Enable the callbacks in C<$icb> only for this stylesheet. C<$icb> should be a C object. This will call C and C automatically during transformation. =item transform_into_chars(doc, %params) Combines C and C. (Added in version 2.0000 .) =back =cut =head1 Parameters LibXSLT expects parameters in XPath format. That is, if you wish to pass a string to the XSLT engine, you actually have to pass it as a quoted string: $stylesheet->transform($doc, param => "'string'"); Note the quotes within quotes there! Obviously this isn't much fun, so you can make it easy on yourself: $stylesheet->transform($doc, XML::LibXSLT::xpath_to_string( param => "string" )); The utility function does the right thing with respect to strings in XPath, including when you have quotes already embedded within your string. =head1 XML::LibXSLT::Security Provides an interface to the libxslt security framework by allowing callbacks to be defined that can restrict access to various resources (files or URLs) during a transformation. The libxslt security framework allows callbacks to be defined for certain actions that a stylesheet may attempt during a transformation. It may be desirable to restrict some of these actions (for example, writing a new file using exsl:document). The actions that may be restricted are: =over =item read_file Called when the stylesheet attempts to open a local file (ie: when using the document() function). =item write_file Called when an attempt is made to write a local file (ie: when using the exsl:document element). =item create_dir Called when a directory needs to be created in order to write a file. NOTE: By default, create_dir is not allowed. To enable it a callback must be registered. =item read_net Called when the stylesheet attempts to read from the network. =item write_net Called when the stylesheet attempts to write to the network. =back =head2 Using XML::LibXSLT::Security The interface for this module is similar to XML::LibXML::InputCallback. After creating a new instance you may register callbacks for each of the security options listed above. Then you apply the security preferences to the XML::LibXSLT or XML::LibXSLT::Stylesheet object using C. my $security = XML::LibXSLT::Security->new(); $security->register_callback( read_file => $read_cb ); $security->register_callback( write_file => $write_cb ); $security->register_callback( create_dir => $create_cb ); $security->register_callback( read_net => $read_net_cb ); $security->register_callback( write_net => $write_net_cb ); $xslt->security_callbacks( $security ); -OR- $stylesheet->security_callbacks( $security ); The registered callback functions are called when access to a resource is requested. If the access should be allowed the callback should return 1, if not it should return 0. The callback functions should accept the following arguments: =over =item $tctxt This is the transform context (XML::LibXSLT::TransformContext). You can use this to get the current XML::LibXSLT::Stylesheet object by calling C. my $stylesheet = $tctxt->stylesheet(); The stylesheet object can then be used to share contextual information between different calls to the security callbacks. =item $value This is the name of the resource (file or URI) that has been requested. =back If a particular option (except for C) doesn't have a registered callback, then the stylesheet will have full access for that action. =head2 Interface =over =item new() Creates a new XML::LibXSLT::Security object. =item register_callback( $option, $callback ) Registers a callback function for the given security option (listed above). =item unregister_callback( $option ) Removes the callback for the given option. This has the effect of allowing all access for the given option (except for C). =back =head1 BENCHMARK Included in the distribution is a simple benchmark script, which has two drivers - one for LibXSLT and one for Sablotron. The benchmark requires the testcases files from the XSLTMark distribution which you can find at http://www.datapower.com/XSLTMark/ Put the testcases directory in the directory created by this distribution, and then run: perl benchmark.pl -h to get a list of options. The benchmark requires XML::XPath at the moment, but I hope to factor that out of the equation fairly soon. It also requires Time::HiRes, which I could be persuaded to factor out, replacing it with Benchmark.pm, but I haven't done so yet. I would love to get drivers for XML::XSLT and XML::Transformiix, if you would like to contribute them. Also if you get this running on Win32, I'd love to get a driver for MSXSLT via OLE, to see what we can do against those Redmond boys! =head1 LIBRARY VERSIONS For debugging purposes, XML::LibXSLT provides version information about the libxslt C library (but do not confuse it with the version number of XML::LibXSLT module itself, i.e. with C<$XML::LibXSLT::VERSION>). XML::LibXSLT issues a warning if the runtime version of the library is less then the compile-time version. =over =item XML::LibXSLT::LIBXSLT_VERSION() Returns version number of libxslt library which was used to compile XML::LibXSLT as an integer. For example, for libxslt-1.1.18, it will return 10118. =item XML::LibXSLT::LIBXSLT_DOTTED_VERSION() Returns version number of libxslt library which was used to compile XML::LibXSLT as a string, e.g. "1.1.18". =item XML::LibXSLT::LIBXSLT_RUNTIME_VERSION() Returns version number of libxslt library to which XML::LibXSLT is linked at runtime (either dynamically or statically). For example, for example, for libxslt.so.1.1.18, it will return 10118. =item XML::LibXSLT::HAVE_EXLT() Returns 1 if the module was compiled with libexslt, 0 otherwise. =back =head1 LICENSE This is free software, you may use it and distribute it under the same terms as Perl itself. Copyright 2001-2009, AxKit.com Ltd. =head1 AUTHOR Matt Sergeant, matt@sergeant.org Security callbacks implementation contributed by Shane Corgatelli. Petr Pajas , pajas@matfyz.org =head1 MAINTAINER Shlomi Fish, L . =head1 BUGS Please report bugs via http://rt.cpan.org/NoAuth/Bugs.html?Dist=XML-LibXSLT =head1 SEE ALSO L , L . =cut