Module: Spid::Saml::Request

Included in:
LogoutRequest, LogoutResponse
Defined in:
lib/spid/ruby-saml/request.rb

Constant Summary collapse

HTTP_POST =

a few symbols for SAML class names

"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
HTTP_GET = 
"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect"

Instance Method Summary collapse

Instance Method Details

#binding_select(service) ⇒ Object

get the IdP metadata, and select the appropriate SSO binding that we can support. Currently this is HTTP-Redirect and HTTP-POST but more could be added in the future



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# File 'lib/spid/ruby-saml/request.rb', line 14

def binding_select(service)
	# first check if we're still using the old hard coded method for 
	# backwards compatability
	if @settings.idp_metadata == nil && @settings.idp_sso_target_url != nil
		@URL = @settings.idp_sso_target_url
		return "GET", content_get
	end
	# grab the metadata
	metadata = Metadata::new
	meta_doc = metadata.get_idp_metadata(@settings)
	
	# first try POST
	sso_element = REXML::XPath.first(meta_doc,
		"/EntityDescriptor/IDPSSODescriptor/#{service}[@Binding='#{HTTP_POST}']")
	if sso_element 
		@URL = sso_element.attributes["Location"]
		#Logging.debug "binding_select: POST to #{@URL}"
		return "POST", content_post
	end
	
	# next try GET
	sso_element = REXML::XPath.first(meta_doc,
		"/EntityDescriptor/IDPSSODescriptor/#{service}[@Binding='#{HTTP_GET}']")
	if sso_element 
		@URL = sso_element.attributes["Location"]
		Logging.debug "binding_select: GET from #{@URL}"
		return "GET", content_get
	end
	# other types we might want to add in the future:  SOAP, Artifact
end

#content_get ⇒ Object

construct the the parameter list on the URL and return



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# File 'lib/spid/ruby-saml/request.rb', line 46

def content_get
	# compress GET requests to try and stay under that 8KB request limit
	deflated_request  = Zlib::Deflate.deflate(@request, 9)[2..-5]
	# strict_encode64() isn't available?  sub out the newlines
	@request_params["SAMLRequest"] = Base64.encode64(deflated_request).gsub(/\n/, "")
	
	Logging.debug "SAMLRequest=#{@request_params["SAMLRequest"]}"
	uri = Addressable::URI.parse(@URL)
	uri.query_values = @request_params
	url = uri.to_s
	#url = @URL + "?SAMLRequest=" + @request_params["SAMLRequest"]
	Logging.debug "Sending to URL #{url}"
	return url
end

#content_post ⇒ Object

construct an HTML form (POST) and return the content



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# File 'lib/spid/ruby-saml/request.rb', line 61

def content_post
	# POST requests seem to bomb out when they're deflated
	# and they probably don't need to be compressed anyway
	@request_params["SAMLRequest"] = Base64.encode64(@request).gsub(/\n/, "")
	
	#Logging.debug "SAMLRequest=#{@request_params["SAMLRequest"]}"
	# kind of a cheesy method of building an HTML, form since we can't rely on Rails too much,
	# and REXML doesn't work well with quote characters
	str = "<html><body onLoad=\"document.getElementById('form').submit();\">\n"
	str += "<form id='form' name='form' method='POST' action=\"#{@URL}\">\n"
	# we could change this in the future to associate a temp auth session ID
	str += "<input name='RelayState' value='ruby-saml' type='hidden' />\n"
	@request_params.each_pair do |key, value|
		str += "<input name=\"#{key}\" value=\"#{value}\" type='hidden' />\n"
	end
	str += "</form></body></html>\n"
	#Logging.debug "Created form:\n#{str}"
	return str
end