我正在尝试测试这样的XML文档(在本例中为SAML):
<saml2p:LogoutRequest xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion" ID="_bbcf6cc5-8832-4567-9a52-7baef04676d7" Version="2.0" IssueInstant="2014-10-21T13:24:54.1397367Z" NotOnOrAfter="2014-10-21T13:34:54.1397367Z">
<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
<SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
<Reference URI="#_bbcf6cc5-8832-4567-9a52-7baef04676d7">
<Transforms>
<Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
<Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
</Transforms>
<DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
<DigestValue>DigestValueGoesHere!</DigestValue>
</Reference>
</SignedInfo>
<SignatureValue>SignatureValueGoesHere!
</SignatureValue>
<KeyInfo>
<X509Data>
<X509Certificate>X509CertificateGoesHere!</X509Certificate>
</X509Data>
</KeyInfo>
</Signature>
</saml2p:LogoutRequest>
为此目的,我已经创建了一些我试图用来测试XML的扩展:
public static class XmlExtensions
{
public static XmlNode Signature(this XmlDocument document)
{
return document.SelectSingleNodeFromDocumentRoot(@"/saml2p:LogoutRequest/Signature");
}
private static XmlNode SelectSingleNodeFromDocumentRoot(this XmlDocument document, string path)
{
var ns = new XmlNamespaceManager(document.NameTable);
ns.AddNamespace("saml2", @"urn:oasis:names:tc:SAML:2.0:assertion");
ns.AddNamespace("saml2p", @"urn:oasis:names:tc:SAML:2.0:protocol");
ns.AddNamespace("ns1", @"http://www.w3.org/2000/09/xmldsig#");
var result = document.SelectSingleNode(path, ns);
return result;
}
}
在我的一个测试中,我正在尝试检索/saml2p:LogoutRequest/Signature
元素,但是我的扩展名返回null。为什么?我以为我应该使用添加了xml命名空间的提供的ns管理器?请注意,查询路径在XPath Visualizer Tool中完美无缺。
答案 0 :(得分:3)
Signature
位于命名空间xmlns="http://www.w3.org/2000/09/xmldsig#"
中,因此您需要调整:
return document.SelectSingleNodeFromDocumentRoot(@"/saml2p:LogoutRequest/ns1:Signature");