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I'm writing a Chrome extension which should apply XSLT transform to certain XML documents on the fly. Just for testing I use the following XML and XSL files:
XML:
<?xml version="1.0" encoding="utf-8" ?>
<WebServiceMessage>
<status>timeout</status>
<message>Nameserver%2520not%2520registered.</message>
<stepName>Finish</stepName>
<stepNumber>11</stepNumber>
<maxStepNumber>11</maxStepNumber>
<percent>100</percent>
<session>2fc0f139b88a800151e5f21b9d747919</session>
</WebServiceMessage>
XSL:
<?xml version="1.0" ?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<html><head></head>
<body>
<xsl:apply-templates/>
</body>
</html>
</xsl:template>
<xsl:template match="*">
<xsl:for-each select="*">
<p><b><xsl:value-of select ="name(.)"/></b>:
<span><xsl:attribute name="id"><xsl:value-of select ="name(.)"/></xsl:attribute><xsl:value-of select="."/></span></p>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
The tranfromation works normally if it's linked inside a test XML file itself, that is via:
<?xml-stylesheet type="text/xsl" href="message.xsl"?>
The extension should inject the same xsl link into XML-files.
manifest.json:
{
"permissions": ["tabs", "<all_urls>"],
"content_scripts":
[
{
"matches": ["<all_urls>"],
"js" : ["contentscript.js"]
}
],
"web_accessible_resources":
[
"message.xsl"
],
"manifest_version": 2
}
contentscript.js:
(function()
{
if(document.xmlVersion != null)
{
var e = document.createProcessingInstruction(
"xml-stylesheet",
"type='text/xsl' href='" + chrome.extension.getURL("message.xsl") + "'");
document.insertBefore(e, document.firstChild);
}
})();
The problem
Chrome outputs the following error into console:
Unsafe attempt to load URL chrome-extension://ladfinoepkgipbeooknnklpakoknohjh/message.xsl from frame with URL http://localhost/out.xml. Domains, protocols and ports must match.
How to fix this? I saw some reports on the Internet related to similar errors, which seems like a bug in Chrome.
I placed the xsl-file on the web-server as well, and changed styleheet link to the web-server. Still the same error:
Unsafe attempt to load URL http://localhost/message.xsl from frame with URL http://localhost/out.xml. Domains, protocols and ports must match.
Apparently domains, protocols, and ports do match.
609
Here is a workaround I'm currently using:
function loadXMLtext(url)
{
xhttp = new XMLHttpRequest();
xhttp.open("GET", url, false);
xhttp.send();
if(xhttp.responseXML == undefined) throw "XHR failed for " + url;
return xhttp.responseXML;
}
function transformxml()
{
var xml = loadXMLtext(document.location.href);
var xsl = loadXMLtext(chrome.extension.getURL("message.xsl"));
var xsltPrs = new XSLTProcessor();
xsltPrs.importStylesheet(xsl);
var result = xsltPrs.transformToFragment(xml, document);
var xmlsrv = new XMLSerializer();
var plaintext = xmlsrv.serializeToString(result);
document.documentElement.innerHTML = plaintext;
}
transformxml();
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