NoMethodError: undefined method `at_xpath' for nil:NilClass

[aitherios]

I'm probably missing something.

Assuming I have the file example.xml with the content:

<?xml version="1.0"?>
<tag>test</tag>

Then I followed your example, and executed the code (replacing the cert, key files and password):

require "signer"

signer = Signer.new(File.read("example.xml"))
signer.cert = OpenSSL::X509::Certificate.new(File.read("cert.pem"))
signer.private_key = OpenSSL::PKey::RSA.new(File.read("key.pem"), "password")

signer.document.xpath("//u:Timestamp", { "u" => "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" }).each do |node|
  signer.digest!(node)
end

signer.document.xpath("//a:To", { "a" => "http://www.w3.org/2005/08/addressing" }).each do |node|
  signer.digest!(node)
end

signer.sign!(:security_token => true)

but I get NoMethodError: undefined method 'at_xpath' for nil:NilClass

[Envek]

By default signer expects a SOAP message with soap:Body, soap:Header tags and oasis:Security tags already present.

But signing of simple XMLs is possible too. Look in this test for inspiration: signer_spec.rb#L91-L110

Probably we should rewrite README a bit.

[swelther]

I had the same problem but the spec helped me. Thanks, rewritten README would be awesome :)

[luis-cbqa]

This line is required to avoid the above error

signer.security_node = signer.document.root

[bindzus]

This line is required to avoid the above error

signer.security_node = signer.document.root

Actually, it doesn't have to be the root node, it depends entirely on where in the XML document you want to insert the signature.