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Produce Metaschemas without XXEs (usnistgov#1665)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| <?xml version="1.0" encoding="UTF-8"?> | ||
| <!-- | ||
| Entity resolver for OSCAL Metaschemas | ||
| This stylesheet: | ||
| 1. Copies an input metaschema module, resolving all external entities | ||
| 2. Replace all import/@href's to match a given $importHrefSuffix parameter | ||
| --> | ||
| <xsl:stylesheet version="1.0" | ||
| xmlns:xsl="http://www.w3.org/1999/XSL/Transform" | ||
| xmlns:metaschema="http://csrc.nist.gov/ns/oscal/metaschema/1.0"> | ||
| <xsl:output omit-xml-declaration="no" indent="yes"/> | ||
|
|
||
| <xsl:param name="importHrefSuffix" select="'RESOLVED'"/> | ||
|
|
||
| <!-- | ||
| XSLT1.0 compatible string replacement | ||
| Via https://gist.github.com/ijy/6572481 | ||
| --> | ||
| <xsl:template name="string-replace"> | ||
| <xsl:param name="string" /> | ||
| <xsl:param name="replace" /> | ||
| <xsl:param name="with" /> | ||
|
|
||
| <xsl:choose> | ||
| <xsl:when test="contains($string, $replace)"> | ||
| <xsl:value-of select="substring-before($string, $replace)" /> | ||
| <xsl:value-of select="$with" /> | ||
| <xsl:call-template name="string-replace"> | ||
| <xsl:with-param name="string" select="substring-after($string,$replace)" /> | ||
| <xsl:with-param name="replace" select="$replace" /> | ||
| <xsl:with-param name="with" select="$with" /> | ||
| </xsl:call-template> | ||
| </xsl:when> | ||
| <xsl:otherwise> | ||
| <xsl:value-of select="$string" /> | ||
| </xsl:otherwise> | ||
| </xsl:choose> | ||
| </xsl:template> | ||
|
|
||
| <!-- Simple identity transform, resolving entities implicitly --> | ||
| <xsl:template match="@*|node()"> | ||
| <xsl:copy> | ||
| <xsl:apply-templates select="@*|node()"/> | ||
| </xsl:copy> | ||
| </xsl:template> | ||
|
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||
| <!-- Transform import/@href using $importHrefSuffix --> | ||
| <xsl:template match="metaschema:import/@href"> | ||
| <xsl:attribute name="href"> | ||
| <!-- oscal_poam_metaschema.xml => oscal_poam_metaschema_$importHrefSuffix.xml --> | ||
| <xsl:call-template name="string-replace"> | ||
| <xsl:with-param name="string" select="." /> | ||
| <xsl:with-param name="replace" select="'.xml'" /> | ||
| <xsl:with-param name="with" select="concat('_', $importHrefSuffix, '.xml')" /> | ||
| </xsl:call-template> | ||
| </xsl:attribute> | ||
| </xsl:template> | ||
| </xsl:stylesheet> |
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