Convert string to binary base64

问题:

Is there any way on how to convert a string to binary base64? I've seen many references but it didn't work in my end. For example I have this input file:

<RootElement xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
     <Data>
         <Binary>
               <RawData>This element should convert string to binary base64.</RawData>
         </Binary>
    </Data>
</RootElement>

I need to generate:

<RootElement xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Data>
    <Binary>
        <RawData>VGhpcyBlbGVtZW50IHNob3VsZCBjb252ZXJ0IHN0cmluZyB0byBiaW5hcnkgYmFzZTY0Lg==</RawData>
    </Binary>
</Data>

I created an xslt and used the namespace I've seen online:

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dp="http://www.datapower.com/extensions">
<xsl:output method="xml" version="1.0" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="@*|node()">
    <xsl:copy>
        <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
</xsl:template>
<xsl:template match="RawData">
    <xsl:element name="RawData">
        <xsl:value-of select="dp:encode(., 'base-64')"/>
    </xsl:element>
</xsl:template>
</xsl:stylesheet>

Thank you.

回答1:

There is a pure XSLT 1.0 solution that works for any XSLT processor: JAXP, Saxon, Xalan, Xsltproc, Microsoft:

1. Download base64.xsl
2. Download base64_binarydatamap.xml

3. Use XSLT 1.0:

   <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:b64="https://github.com/ilyakharlamov/xslt_base64">
       <xsl:output method="xml"/>
       <xsl:include href="base64.xsl"/>
       <xsl:template match="@*|node()">
           <xsl:copy>
               <xsl:apply-templates select="@*|node()" />
           </xsl:copy>
       </xsl:template>
       <xsl:template match="/RootElement/Data/Binary/RawData">
           <xsl:call-template name="b64:encode">
               <xsl:with-param name="asciiString" select="text()"/>
           </xsl:call-template>
       </xsl:template>
   </xsl:stylesheet>