GeniXML.pm.in 22.4 KB
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#!/usr/bin/perl -w
#
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# Copyright (c) 2010-2012 University of Utah and the Flux Group.
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# 
# {{{GENIPUBLIC-LICENSE
# 
# GENI Public License
# 
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and/or hardware specification (the "Work") to
# deal in the Work without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Work, and to permit persons to whom the Work
# is furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Work.
# 
# THE WORK IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE WORK OR THE USE OR OTHER DEALINGS
# IN THE WORK.
# 
# }}}
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#
package GeniXML;

use strict;
use Exporter;
use vars qw(@ISA @EXPORT);

@ISA = "Exporter";
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@EXPORT = qw(Parse ParseFile GetXmlVersion IsVersion0 FindNodes FindNodesNS
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FindFirst FindElement FindAttr GetNodeByVirtualId GetLinkByVirtualId
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IsLanNode IsLocalNode IsTunnel GetExpires GetBandwidth GetIp GetVnodeId
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GetNodeId GetVirtualId GetInterfaceId GetInterfaceNodeId GetSliverId
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GetManagerId GetColocate GetSubnodeOf GetStartupCommand GetTarball
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GetVirtualizationType SetVirtualizationSubtype GetVirtualizationSubtype
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GetExclusive SetExclusive GetLinkManager SetText GetText Serialize
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CreateDocument AddElement RemoveChild PolicyExists GetMask
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GetDiskImage IsUntaggedLan IsTaggedLan);
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use English;
use XML::LibXML;
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use XML::LibXML::XPathContext;
use XML::LibXML::NodeList;
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use GeniHRN;
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use GeniUtil;
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use Carp qw(cluck carp);

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use vars qw($RSPEC_0_1 $RSPEC_0_2 $RSPEC_2 $RSPEC_3
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            $RSPEC_0_1_NS $RSPEC_0_2_NS $RSPEC_2_NS
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            $EMULAB_NS $XSI_NS $STITCH_NS $SHAREDVLAN_NS
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            $REQUEST_2_URL $MANIFEST_2_URL
            $REQUEST_3_URL $MANIFEST_3_URL);
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$RSPEC_0_1 = "0.1";
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$RSPEC_0_2 = "0.2";
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$RSPEC_2 = "2";
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$RSPEC_3 = "3";
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our $RSPEC_0_1_NS = "http://www.protogeni.net/resources/rspec/0.1";
our $RSPEC_0_2_NS = "http://www.protogeni.net/resources/rspec/0.2";
our $RSPEC_2_NS = "http://www.protogeni.net/resources/rspec/2";
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our $RSPEC_3_NS = "http://www.geni.net/resources/rspec/3";
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our $EMULAB_NS = "http://www.protogeni.net/resources/rspec/ext/emulab/1";
our $XSI_NS = "http://www.w3.org/2001/XMLSchema-instance";
our $STITCH_NS = "http://hpn.east.isi.edu/rspec/ext/stitch/0.1/";
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our $SHAREDVLAN_NS = "http://www.geni.net/resources/rspec/ext/shared-vlan/1";
our $SHAREDVLAN_PG_NS = "http://www.protogeni.net/resources/rspec/ext/shared-vlan/1";
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$REQUEST_2_URL = "http://www.protogeni.net/resources/rspec/2/request.xsd";
$MANIFEST_2_URL = "http://www.protogeni.net/resources/rspec/2/manifest.xsd";
$REQUEST_3_URL = "http://www.geni.net/resources/rspec/3/request.xsd";
$MANIFEST_3_URL = "http://www.geni.net/resources/rspec/3/manifest.xsd";
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# Configure variables
my $TB		   = "@prefix@";
my $TBOPS          = "@TBOPSEMAIL@";

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# Name Space stuff
my $DELAY_NS = "http://www.protogeni.net/resources/rspec/ext/delay/1";

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# Returns the document element by parsing a given string. If the
# string fails to parse, returns undefined.
sub Parse($)
{
    my ($xml) = @_;
    my $parser = XML::LibXML->new;
    my $doc;
    eval {
        $doc = $parser->parse_string($xml);
    };
    if ($@) {
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	carp("Failed to parse xml string: $@\nXML: $xml\n\n");
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	return undef;
    } else {
	return $doc->documentElement();
    }
}

sub ParseFile($)
{
    my ($file) = @_;
    my $parser = XML::LibXML->new;
    my $doc;
    eval {
        $doc = $parser->parse_file($file);
    };
    if ($@) {
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	carp("Failed to parse xml string: $@");
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	return undef;
    } else {
	return $doc->documentElement();
    }
}

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# Determines the rspec version of a node by examining is namespace URI
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sub GetXmlVersion($)
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{
    my ($node) = @_;
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    my $result = undef;
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    my $ns = $node->namespaceURI();
    if (defined($ns)) {
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	if ($ns =~ /protogeni.net\/resources\/rspec\/0.1$/) {
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	    $result = $RSPEC_0_1;
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	} elsif ($ns =~ /protogeni.net\/resources\/rspec\/0.2$/) {
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	    $result = $RSPEC_0_2;
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	} elsif ($ns =~ /protogeni.net\/resources\/rspec\/2$/) {
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	    $result = $RSPEC_2;
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	} elsif ($ns =~ /geni.net\/resources\/rspec\/3$/) {
	    $result = $RSPEC_3;
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	} else {
	    carp("Unknown rspec namespace: " . $ns);
	    $result = $RSPEC_0_1;
	}
    }
    return $result;
}

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sub IsVersion0($)
{
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    my $version = GetXmlVersion($_[0]);
    return defined($version)
	&& ($version eq $RSPEC_0_1 || $version eq $RSPEC_0_2);
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}

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# Returns a NodeList for a given XPath using a given node as
# context. 'n' is defined to be the prefix for the namespace of the
# node.
sub FindNodes($$)
{
    my ($path, $node) = @_;
    my $result = undef;
    my $ns = undef;
    eval {
	my $xc = XML::LibXML::XPathContext->new();
	$ns = $node->namespaceURI();
	if (defined($ns)) {
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	    $xc->registerNs('n', $ns);
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	} else {
	    $path =~ s/\bn://g;
	}
	$result = $xc->findnodes($path, $node);
    };
    if ($@) {
	if (! defined($ns)) {
	    $ns = "undefined";
	}
        cluck "Failed to find nodes using XPath path='$path', ns='$ns': $@\n";
	return XML::LibXML::NodeList->new();
    } else {
	return $result;
    }
}

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# Returns a NodeList for a given XPath using a given namespace as
# context. 'n' is defined to be the prefix for the given namespace.
sub FindNodesNS($$$)
{
    my ($path, $node, $nsURI) = @_;
    my $result = undef;
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    return XML::LibXML::NodeList->new()
        if (!defined($node));
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    eval { 
  my $xc = XML::LibXML::XPathContext->new();
  if (defined($nsURI)) {
      $xc->registerNs('n', $nsURI);
  } else {
      $path =~ s/\bn://g;
  }
  $result = $xc->findnodes($path, $node);
    };
    if ($@) {
  if (! defined($nsURI)) {
      $nsURI = "undefined";
  }
        cluck "Failed to find nodes using XPath path='$path', nsURI='$nsURI': $@\n";        
  return XML::LibXML::NodeList->new();
    } else { 
  return $result;
    } 
}


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# Returns the first Node which matches a given XPath against a given
# node. If that node is not of the specified type, returns
# undefined. Works like FindNodes.
sub FindNodeType($$$)
{
    my ($path, $node, $type) = @_;
    my $result = FindNodes($path, $node)->pop();
    if (defined($result) && $result->nodeType() != $type) {
	$result = undef;
    }
    return $result;
}

# Returns the first Node which matches a given XPath.
sub FindFirst($$)
{
    my ($path, $node) = @_;
    return FindNodes($path, $node)->pop();
}

# Returns the first Element which matches a given XPath.
sub FindElement($$)
{
    my ($path, $node) = @_;
    return FindNodeType($path, $node, XML_ELEMENT_NODE);
}

# Returns the first Attribute which matches a given XPath.
sub FindAttr($$)
{
    my ($path, $node) = @_;
    return FindNodeType($path, $node, XML_ATTRIBUTE_NODE);
}

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sub GetElementByVirtualId($$$)
{
    my ($name, $type, $node) = @_;
    my @list = FindNodes('n:'.$type.'[@virtual_id = "'.$name.'"]',
			 $node)->get_nodelist();
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    if (scalar(@list) == 0) {
	@list = FindNodes('n:'.$type.'[@nickname = "'.$name.'"]',
			  $node)->get_nodelist();
    }
    if (scalar(@list) == 0) {
	@list = FindNodes('n:'.$type.'[@client_id = "'.$name.'"]',
			  $node)->get_nodelist();
    }
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    my $result = undef;
    if (scalar(@list) > 0)
    {
	$result = $list[0];
    }
    if (scalar(@list) > 1)
    {
	cluck("WARNING: Multiple $type with virtual_id $name found");
    }
    return $result;
}

sub GetNodeByVirtualId($$)
{
    my ($name, $node) = @_;
    return GetElementByVirtualId($name, 'node', $node);
}

sub GetLinkByVirtualId($$)
{
    my ($name, $node) = @_;
    return GetElementByVirtualId($name, 'link', $node);    
}

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# Returns true if a given XML Node is an RSpec node and is of type lan
sub IsLanNode($)
{
    my ($node) = @_;
    my $result = 0;
    if (defined($node) && $node->localname() eq "node") {
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	foreach my $lan (FindNodes("n:hardware_type",
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				   $node)->get_nodelist()) {
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	    my $typeName = GetFirstText($lan, "type_name", "name");
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	    if (defined($typeName) && $typeName eq "lan") {
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		$result = 1;
		last;
	    }
	}
    }
    return $result;
}

# Returns true if a given XML Node is an RSpec node and either has
# the current CM as a 'component_manager_urn' or
# 'component_manager_uuid or no component_manager defined.
sub IsLocalNode($)
{
    my ($node) = @_;
    my $result = 0;
    if (defined($node) && $node->localname() eq "node") {
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	my $manager_uuid  = GetManagerId($node);
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	if (! defined($manager_uuid) ||
	    GeniHRN::Equal($manager_uuid, $ENV{'MYURN'}) ||
	    $manager_uuid eq $ENV{'MYUUID'}) {

	    $result = 1;
	}
    }
    return $result;
}

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sub IsTunnel($)
{
    my ($link) = @_;
    my $result = 0;
    if (IsVersion0($link)) {
	my $link_type = GetText("link_type", $link);
	$result = (defined($link_type) && $link_type eq "tunnel");
    } else {
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	my @types = FindNodes("n:link_type", $link)->get_nodelist();
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	foreach my $current (@types) {
	    my $name = GetText("name", $current);
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	    if (defined($name) && $name eq "gre-tunnel") {
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		$result = 1;
		last;
	    }
	}
    }
    return $result;
}

sub GetExpires($)
{
    my ($node) = @_;
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    return GetFirstText($node, "valid_until", "expires");
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}

sub SetExpires($$)
{
    my ($node, $arg) = @_;
    if (IsVersion0($node)) {
	SetText("valid_until", $node, $arg);
    } else {
	SetText("expires", $node, $arg);
    }
}

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sub GetBandwidth($)
{
    my ($link) = @_;
    my $result = undef;
    if (IsVersion0($link)) {
	$result = GeniXML::GetText("bandwidth", $link);
    } else {
	my $prop = FindFirst("n:property", $link);
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	if (defined($prop)) {
	    $result = GeniXML::GetText("capacity", $prop);
	}
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    }
    return $result;
}

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sub GetMask($$)
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{
    my ($ifaceref, $node) = @_;
    my $result = undef;
    if (IsVersion0($ifaceref)) {
	$result = GetText("tunnel_ip", $ifaceref);
    } else {
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	my $id = GetInterfaceId($ifaceref);
	my @ifaces = FindNodes("n:interface", $node)->get_nodelist();
	foreach my $iface (@ifaces) {
	    my $testid = GetInterfaceId($iface);
	    if (defined($id) && defined($testid) && $testid eq $id) {
		my $ip = FindFirst("n:ip", $iface);
		if (defined($ip)) {
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		    $result = GetFirstText($ip, "netmask", "mask");
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		}
		last;
	    }
	}
    }
    return $result;
}

sub GetIp($$)
{
    my ($ifaceref, $node) = @_;
    my $result = undef;
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    if (IsVersion0($ifaceref)) {
	$result = GetText("tunnel_ip", $ifaceref);
    } else {
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	my $id = GetInterfaceId($ifaceref);
	my @ifaces = FindNodes("n:interface", $node)->get_nodelist();
	foreach my $iface (@ifaces) {
	    my $testid = GetInterfaceId($iface);
	    if (defined($id) && defined($testid) && $testid eq $id) {
		my $ip = FindFirst("n:ip", $iface);
		if (defined($ip)) {
		    $result = GetText("address", $ip);
		}
		last;
	    }
	}
    }
    return $result;
}

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# Returns the vnode id in the emulab extension or failing that the component_id
sub GetVnodeId($)
{
    my ($node) = @_;
    my $result = undef;
    if (IsVersion0($node)) {
	$result = GetNodeId($node);
    } else {
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	my $vnoderef = GeniXML::FindNodesNS("n:vnode", $node,
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					    $EMULAB_NS)->pop();
	if (defined($vnoderef)) {
	    $result = GetText("name", $vnoderef);
	}
	if (! defined($result)) {
	    $result = GetNodeId($node);
	}
    }
    return $result;
}

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# Returns the uuid or urn of an RSpec node or undef if it is not a node.
sub GetNodeId($)
{
    my ($node) = @_;
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    my $result = GetFirstText($node, "component_urn", "component_id",
			      "component_uuid", "uuid");
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    if (defined($result) && $result eq "") {
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	$result = undef;
    }
    return $result;
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}

sub GetVirtualId($)
{
    my ($node) = @_;
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    return GetFirstText($node, "virtual_id", "nickname", "client_id");
}

sub GetInterfaceId($)
{
    my ($node) = @_;
    return GetFirstText($node, "virtual_interface_id", "iface_name",
			"client_id", "virtual_port_id", "virtual_id");
}

sub GetInterfaceNodeId($)
{
    my ($node) = @_;
    return GetFirstText($node, "virtual_node_id", "node_nickname");
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}

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sub GetSliverId($)
{
    my ($node) = @_;
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    return GetFirstText($node, "sliver_urn", "sliver_id");
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}

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sub GetManagerId($)
{
    my ($node) = @_;
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    my $result = GetFirstText($node, "component_manager_urn",
			      "component_manager_id",
			      "component_manager_uuid");
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    if (defined($result) && $result eq "") {
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	$result = undef;
    }
    return $result;
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}

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sub GetColocate($)
{
    my ($node) = @_;
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    my $result = GetFirstText($node, "colocate", "phys_nickname");
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    return $result;
}

sub GetSubnodeOf($)
{
    my ($node) = @_;
    my $result = undef;
    if (IsVersion0($node)) {
	$result = GetText("subnode_of", $node);
    } else {
	my @relations = FindNodes("n:relation", $node)->get_nodelist();
	foreach my $current (@relations) {
	    if (GetText("type", $current) == "subnode_of") {
		$result = GetText("client_id", $current);
		last;
	    }
	}
    }
    return $result;
}

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sub GetServices($)
{
    my ($node) = @_;
    my @result = ();
    my @services = FindNodes("n:services", $node)->get_nodelist();

    foreach my $service (@services) {
	foreach my $current ($service->childNodes()) {
	    my $item;
	    my $type = $current->nodeName();
	
	    if ($type eq "execute") {
		$type = "execute";
		my $cmd  = GetText("command", $current);
		my $shell= GetText("shell", $current);
		$item = {"type"   => $type,
			 "cmd"    => $cmd,
			 "shell"  => $shell};
	    }
	    elsif ($type eq "install") {
		$type = "install";
		my $dir = GetText("install_path", $current);
		my $url = GetText("url", $current);
		$item = {"type"   => $type,
			 "dir"    => $dir,
			 "url"    => $url};
	    }
	    else {
		next;
	    }
	    push(@result, $item);
	}
    }
    return @result;
}

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sub GetStartupCommand($)
{
    my ($node) = @_;
    my $result = undef;
    if (IsVersion0($node)) {
        $result = GetText("startup_command", $node);
    } else {
	my $execute = FindFirst("n:services/n:execute", $node);
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	if (defined($execute)) {
	    $result = GetText("command", $execute);
	}
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    }
    return $result;
}

sub GetTarball($)
{
    my ($node) = @_;
    my $result = undef;
    if (IsVersion0($node)) {
        $result = GetText("tarfiles", $node);
    } else {
	$result = "";
	my @tarlist = FindNodes("n:services/n:install",
				$node)->get_nodelist();
	foreach my $current (@tarlist) {
	    my $url = GetText("url", $current);
	    my $install = GetText("install_path", $current);
	    if (defined($url) && defined($install)) {
		# TODO: Make sure url/install don't have semicolons or spaces
		# TODO: Flag an error if either one is not defined
		if ($result ne "") {
		    $result .= ";";
		}
		$result .= $install . " " . $url;
	    }
	}
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	if (defined($result) && $result eq "") {
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	    $result = undef;
	}
    }
    return $result;
}

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sub GetVirtualizationType($)
{
    my ($node) = @_;
    my $result = "emulab-vnode";
    if (IsVersion0($node)) {
	$result = GetText("virtualization_type", $node);
    }
    return $result;
}

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sub SetVirtualizationSubtype($$)
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{
    my ($node, $arg) = @_;
    my $result = 1;
    if (IsVersion0($node)) {
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	$result = SetText("virtualization_subtype", $node, $arg);
    } else {
	my $type = FindFirst("n:sliver_type", $node);
	if (! defined($type)) {
	    $type = AddElement("sliver_type", $node);
	}
	SetText("name", $type, $arg);
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    }
    return $result;
}

sub GetVirtualizationSubtype($)
{
    my ($node) = @_;
    my $result = undef;
    if (IsVersion0($node)) {
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	$result = GetText("virtualization_subtype", $node);
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    } else {
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	my $type = FindFirst("n:sliver_type", $node);
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	if (defined($type)) {
	    $result = GetText("name", $type);
	}
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    }
    return $result;
}

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sub GetDiskImage($)
{
    my ($node) = @_;
    my $result = undef;
    if (IsVersion0($node)) {
	$result = FindFirst("n:disk_image", $node);
    } else {
	my $type = FindFirst("n:sliver_type", $node);
	if (defined($type)) {
	    $result = FindFirst("n:disk_image", $type);
	}
    }
    return $result;
}

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sub GetExclusive($)
{
    my ($node) = @_;
    my $exclusive = GetText("exclusive", $node);
    my $result = $exclusive;
    if (defined($exclusive) && ! IsVersion0($node)) {
	$result = ($exclusive eq "true");
    }
    return $result;
}

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sub SetExclusive($$)
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{
    my ($node, $arg) = @_;
    my $result = 1;
    if (IsVersion0($node)) {
	$result = SetText("exclusive", $node, $arg);
    } else {
	my $textArg = "false";
	if ($arg) {
	    $textArg = "true";
	}
	$result = SetText("exclusive", $node, $textArg);
    }
    return $result;
}

sub GetLinkManager($)
{
    my ($link) = @_;
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    return GetFirstText($link, "id", "name");
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}

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sub GetDelayPipes($)
{
    my ($node) = @_;
    my @result = ();
    
    if (! IsVersion0($node)) {
	my $type = FindFirst("n:sliver_type", $node);
	if (defined($type)) {
	    my $name = GetText("name", $type);
	    if (defined($name) && $name eq "delay") {
		@result = FindNodesNS("n:sliver_type_shaping/n:pipe", $type,
				      $DELAY_NS)->get_nodelist();
	    }
	}
    }
    return @result;
}

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sub IsUntaggedLan($)
{
    my ($link) = @_;
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    my $result = 0;
    my @tagged = FindNodesNS("n:untagged_vlan", $link,
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			     $EMULAB_NS)->get_nodelist();
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    if (scalar(@tagged) > 0) {
	my $enabled = GetText("enabled", $tagged[0]);
	$result = defined($enabled) && $enabled eq "false";
    }
    return $result;
}

sub IsTaggedLan($)
{
    my ($link) = @_;
    my $result = 0;
    my @tagged = FindNodesNS("n:untagged_vlan", $link,
			     $EMULAB_NS)->get_nodelist();
    if (scalar(@tagged) > 0) {
	my $enabled = GetText("enabled", $tagged[0]);
	$result = defined($enabled) && $enabled eq "true";
    }
    return $result;
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}

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sub GetSharedLanName($)
{
    my ($iface) = @_;

    if (! IsVersion0($iface)) {
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	my $interface_name = FindNodesNS("n:link_shared_vlan", $iface,
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					 $SHAREDVLAN_NS)->pop();
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	if (! defined($interface_name)) {
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	    $interface_name = FindNodesNS("n:link_shared_vlan", $iface,
					  $SHAREDVLAN_PG_NS)->pop();
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	}
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	if (defined($interface_name)) {
	    my $name = GetText("name", $interface_name);
	    if (defined($name) and $name ne "") {
		return $name;
	    }
	}
    }
    return undef;
}

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# Takes an attribute/element name, *NOT AN XPATH* and a node and sets
# the text of that node to a particular value. If the node is an
# attribute, the value is set. If it is an element with just a text
# node child, that node is replaced.
# Returns 1 on success and 0 on failure.
sub SetText($$$)
{
    my ($name, $node, $text) = @_;
    my $result = 0;
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    my $child = FindFirst('@n:'.$name, $node);
    if (! defined($child)) {
	$child = FindFirst('@'.$name, $node);
    }
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    if (defined($child)) {
	if ($child->nodeType() == XML_ATTRIBUTE_NODE) {
	    $child->setValue($text);
	    $result = 1;
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	}
    } else {
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	$child = FindFirst('n:'.$name, $node);
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	if (defined($child)) {
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	    my @grand = $child->childNodes();
	    if (scalar(@grand) == 1
		&& $grand[0]->nodeType() == XML_TEXT_NODE) {
		$grand[0]->setData($text);
		$result = 1;
	    } elsif (scalar(@grand) == 0
		     && $child->nodeType() == XML_ELEMENT_NODE) {
		$child->appendText($text);
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		$result = 1;
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	    }
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	} elsif ($node->nodeType() == XML_ELEMENT_NODE) {
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	    my $ns = $node->namespaceURI();
	    if (defined($ns)) {
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# TODO: Submit bug report for the library. This call is bugged.
#		$node->setAttributeNS($ns, "rs:$name", $text);
		$node->setAttribute($name, $text);
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	    } else {
		$node->setAttribute($name, $text);
	    }
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	    $result = 1;
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	}
    }
    return $result;
}

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# Get the text contents of a child of a node with a particular
# name. This can be either an attribute or an element.
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sub GetText($$)
{
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    my ($name, $node) = @_;
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    my $result = undef;
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    my $child = FindFirst('@n:'.$name, $node);
    if (! defined($child)) {
	$child = FindFirst('@'.$name, $node);
    }
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    if (! defined($child)) {
	$child = FindFirst('n:'.$name, $node);
    }
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    if (defined($child)) {
	$result = $child->textContent();
    }
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    if (defined($result)) {
	$result =~ s/^\s*(.*)\s*$/$1/s;
    }
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    return $result;
}

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# Run GetText serially using the initial argument as an XML node
# reference and the remaining arguments as names and return the first
# defined result. Returns undefined if there are no names or if all
# GetText calls return undefined.
sub GetFirstText($@)
{
    my $node = shift(@_);
    my $result = undef;
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    foreach my $name (@_) {
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	$result = GetText($name, $node);
	if (defined($result)) {
	    last;
	}
    }
    return $result;
}

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# Converts the XML representation of a node to a UTF-8 string and
# outputs it as a complete XML document.
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sub Serialize($;$)
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{
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    my ($node, $format) = @_;
    $format = 0 if (!defined($format));
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    my $newnode = $node->cloneNode(1);
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    return $newnode->toString($format);
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}

# Create a new XML document with a given namespace URI and document
# element name.
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sub CreateDocument($$)
{
    my ($ns, $name) = @_;
    my $doc = XML::LibXML::Document->createDocument("1.0", "UTF-8");
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    my $root = $doc->createElementNS($ns, "$name");
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    $doc->setDocumentElement($root);
    return $doc;
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}

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# Add a new element to a node. The new element will have the given
# name and be otherwise empty.
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sub AddElement($$;$)
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{
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    my ($name, $node, $namespace) = @_;
    my $ns = $namespace;
    if (! defined($namespace)) {
	$ns = $node->namespaceURI();
    }
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    my $child = $node->addNewChild($ns, "rs:$name");
    return $child;
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}

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# Remove a node with a given name from a node. It will be removed
# whether it is an attribute or an element. The name is not an xpath.
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sub RemoveChild($$)
{
    my ($name, $node) = @_;
    my $child = FindFirst('@n:'.$name, $node);
    if (! defined($child)) {
	$child = FindFirst('n:'.$name, $node);
    }
    if (defined($child)) {
	$node->removeChild($child);
    }
}

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# Replaces a node (oldnode) with a copy of another node (newnode)
sub ReplaceNode($$)
{
    my ($oldnode, $newnode) = @_;
    my $copy = $newnode->cloneNode(1);
    $oldnode->replaceNode($copy);
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    return $copy;
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}

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# checks for the existense of policy in extensions of the given
# credential.
sub PolicyExists($$)
{
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    my ($policy, $credential) = @_;
    my $exists = 0;
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    return 0
        if (!ref($credential) or !defined($policy));
    my $extensions_elem = $credential->extensions();
    return 0
        if (!defined($extensions_elem));
    my $policies = GeniXML::FindNodesNS("//n:policy_exceptions/*",
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          $extensions_elem, $GeniUtil::EXTENSIONS_NS);
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    foreach my $epolicy ($policies->get_nodelist) {
        if ($policy eq $epolicy->string_value) {
            $exists = 1;
            last;
        }      
    }       
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    return $exists;
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}

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# _Always_ make sure that this 1 is at the end of the file...
1;