Class: XCAPClient::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/xcapclient/client.rb

Overview

The base class of the library. A program using this library must instantiate it.

Common notes for methods get*, put* and delete*

Shared parameters

auid: String, the auid of the application. Example:“pres-rules”.

document: nil by default. It can be:

* String, so the application must contain a document called as it.
* XCAPClient::Document object.
* nil, so the application default document is selected.

check_etag: true by default. If true the client adds the header “If-None-Match” or “If-Match” to the HTTP request containing the last ETag received.

selector: Document/node selector. The path that identifies the XML document or node within the XCAP root URL. It’s automatically converted to ASCII and percent encoded if needed. Example:

'/cp:ruleset/cp:rule/cp:conditions/cp:identity/cp:one[@id="sip:[email protected]"]'

xml_namespaces: nil by default. It’s a hash containing the prefixes and namespaces used in the query. Example:

{"pr"=>"urn:ietf:params:xml:ns:pres-rules", "cp"=>"urn:ietf:params:xml:ns:common-policy"}

Exceptions

If these methods receive a non HTTP 2XX response they generate an exception. Check ERRORS.rdoc for detailed info.

Access to the full response

In any case, the HTTP response is stored in the document last_response attribute as an :Message object. To get it:

@xcapclient.application("pres-rules").document.last_response

Constant Summary collapse

USER_AGENT = 
"Ruby-XCAPClient"
COMMON_HEADERS = 
{
	"User-Agent" => "#{USER_AGENT}/#{VERSION}",
	"Connection" => "close"
}
GLOBAL_XUI = 
"global"
XCAP_CAPS_XMLNS = 
"urn:ietf:params:xml:ns:xcap-caps"
HTTP_TIMEOUT = 
6
CONF_PARAMETERS = 
[:xcap_root, :user, :auth_user, :password, :identity_header, :identity_user, :ssl_verify_cert]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(conf = {}, applications = {}) ⇒ Client

Create a new XCAP client. It requires two parameters:

  • conf: A hash containing settings related to the server:

    • xcap_root: The URL where the documents hold.

    • user: The client username. Depending on the server it could look like “sip:[email protected]”, “[email protected]”, “alice”, “tel:+12345678”…

    • auth_user: Username, SIP URI or TEL URI for HTTP Digest authentication (if required). If not set it takes the value of user field.

    • identity_header: Header required in some XCAP networks containing the user identity (i.e. “X-XCAP-Preferred-Identity”).

    • identity_user: Value for the identity_header. It could be a SIP or TEL URI. If not set it takes teh value of user field.

    • ssl_verify_cert: If true and the server uses SSL, the certificate is inspected (expiration time, signature…).

  • applications: A hash of hashes containing each XCAP application available for the client. Each application is an entry of the hash containing a key whose value is the “auid” of the application and whose value is a hast with the following fields:

    • xmlns: The XML namespace uri of the application.

    • document_name: The name of the default document for this application (“index” if not set).

    • scope: Can be :user or :global (:user if not set).

      • :user: Each user has his own document(s) for this application.

      • :global: The document(s) is shared for all the users.

Example:

xcap_conf = {
  :xcap_root => "https://xcap.domain.org/xcap-root",
  :user => "sip:[email protected]",
  :auth_user => "alice",
  :password => "1234",
  :ssl_verify_cert => false
}
xcap_apps = {
  "pres-rules" => {
    :xmlns => "urn:ietf:params:xml:ns:pres-rules",
    :mime_type => "application/auth-policy+xml",
    :document_name => "index",
    :scope => :user
  },
  "rls-services" => {
    :xmlns => "urn:ietf:params:xml:ns:rls-services",
    :mime_type => "application/rls-services+xml",
    :document_name => "index",
    :scope => :user
  }
}

@client = Client.new(xcap_conf, xcap_apps)

Example:

xcap_conf = {
  :xcap_root => "https://xcap.domain.net",
  :user => "tel:+12345678",
  :auth_user => "tel:+12345678",
  :password => "1234",
  :identity_header => "X-XCAP-Preferred-Identity",
  :ssl_verify_cert => true
}

A XCAP application called “xcap-caps” is automatically added to the list of applications of the new client. This application is defined in the RFC 4825.

Raises:



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# File 'lib/xcapclient/client.rb', line 108

def initialize(conf={}, applications={})
	
	# Check conf hash.
	raise ConfigError, "`conf' must be a hash" unless (Hash === conf)
	
	# Check non existing parameter names.
	conf.each_key do |key|
		raise ConfigError, "Uknown parameter name '#{key}' in `conf' hash" unless CONF_PARAMETERS.include?(key)
	end
	
	# Check xcap_root parameter.
	@xcap_root = ( conf[:xcap_root] =~ /\/$/ ) ? URI.parse(conf[:xcap_root][0..-2]) : URI.parse(conf[:xcap_root])
	raise ConfigError, "`xcap_root' must be http or https URI" unless [URI::HTTP, URI::HTTPS].include?(@xcap_root.class)
	
	# Check user.
	@user = conf[:user].freeze
	raise ConfigError, "`user' must be a non empty string" unless (String === @user && ! @user.empty?)
	
	@auth_user = conf[:auth_user].freeze || @user
	@password = conf[:password].freeze
	
	@identity_header = conf[:identity_header].freeze
	@identity_user = ( conf[:identity_user].freeze || @user )  if @identity_header
	COMMON_HEADERS[@identity_header] = '"' + @identity_user + '"'  if @identity_header
	
	# Initialize the HTTP client.
	@http_client = HTTPClient.new
	@http_client.set_auth(@xcap_root, @auth_user, @password)
	@http_client.protocol_retry_count = 3  ### TODO: Set an appropiate value (min 2 for 401).
	@http_client.connect_timeout = HTTP_TIMEOUT
	@http_client.send_timeout = HTTP_TIMEOUT
	@http_client.receive_timeout = HTTP_TIMEOUT
	
	@xcap_root.freeze  # Freeze now as it has been modified in @http_client.set_auth.
	
	# Check ssl_verify_cert parameter.
	if URI::HTTPS === @xcap_root
		@ssl_verify_cert = conf[:ssl_verify_cert] || false
		raise ConfigError, "`ssl_verify_cert' must be true or false" unless [TrueClass, FalseClass].include?(@ssl_verify_cert.class)
		@http_client.ssl_config.verify_mode = ( @ssl_verify_cert ? 3 : 0 )
	end
	
	# Generate applications.
	@applications = {}
	
	# Add the "xcap-caps" application.
	@applications["xcap-caps"] = Application.new("xcap-caps", {
		:xmlns => "urn:ietf:params:xml:ns:xcap-caps",
		:mime_type => "application/xcap-caps+xml",
		:scope => :global,
		:document_name => "index"
	})
	
	# Add custom applications.
	applications.each do |auid, data|
		@applications[auid] = Application.new(auid, data)
	end
	
	@applications.freeze
	
end

Instance Attribute Details

#auth_user ⇒ Object (readonly)

Returns the value of attribute auth_user.



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# File 'lib/xcapclient/client.rb', line 51

def auth_user
  @auth_user
end

#identity_header ⇒ Object (readonly)

Returns the value of attribute identity_header.



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# File 'lib/xcapclient/client.rb', line 51

def identity_header
  @identity_header
end

#identity_user ⇒ Object (readonly)

Returns the value of attribute identity_user.



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# File 'lib/xcapclient/client.rb', line 51

def identity_user
  @identity_user
end

#password ⇒ Object (readonly)

Returns the value of attribute password.



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# File 'lib/xcapclient/client.rb', line 51

def password
  @password
end

#ssl_verify_cert ⇒ Object (readonly)

Returns the value of attribute ssl_verify_cert.



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# File 'lib/xcapclient/client.rb', line 51

def ssl_verify_cert
  @ssl_verify_cert
end

#user ⇒ Object (readonly)

Returns the value of attribute user.



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# File 'lib/xcapclient/client.rb', line 51

def user
  @user
end

#xcap_root ⇒ Object (readonly)

Returns the value of attribute xcap_root.



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# File 'lib/xcapclient/client.rb', line 51

def xcap_root
  @xcap_root
end

Instance Method Details

#application(auid) ⇒ Object

Returns the XCAPClient::Application whose auid mathes the auid parameter.

Example:

@xcapclient.application("pres-rules")



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# File 'lib/xcapclient/client.rb', line 177

def application(auid)
	@applications[auid]
end

#applications ⇒ Object

Returns an Array with all the applications configured in the client.



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# File 'lib/xcapclient/client.rb', line 183

def applications
	@applications
end

#delete(auid, document = nil, check_etag = true) ⇒ Object

Delete a document in the server.

Example:

@xcapclient.delete("pres-rules")

If success:

  • The method returns true.

  • Local plain document and ETag are deleted.



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# File 'lib/xcapclient/client.rb', line 252

def delete(auid, document=nil, check_etag=true)
	
	application, document = get_app_doc(auid, document)
	response = send_request(:delete, application, document, nil, nil, nil, nil, check_etag)
	
	# Reset the local document.
	document.plain = nil
	document.etag = nil
	
	return true
	
end

#delete_attribute(auid, document, selector, attribute_name, xml_namespaces = nil, check_etag = true) ⇒ Object

Delete a node attribute in the document stored in the server.

Example, deleting the “name” attribute of the node with “id” = “sip:[email protected]”:

@xcapclient.delete_attribute("pres-rules", nil,
  'cp:ruleset/cp:rule[@id="pres_whitelist"]/cp:conditions/cp:identity/cp:one[@id="sip:[email protected]"]',
  "name",
  {"cp" => "urn:ietf:params:xml:ns:common-policy"})

If success:

  • The method returns true.

  • Local plain document and ETag are deleted (as the document has changed).



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# File 'lib/xcapclient/client.rb', line 411

def delete_attribute(auid, document, selector, attribute_name, xml_namespaces=nil, check_etag=true)
	
	application, document = get_app_doc(auid, document)
	response = send_request(:delete, application, document, selector + "/@#{attribute_name}", nil, xml_namespaces, nil, check_etag)
	
	# Reset local plain document and ETag as we have modified it
	document.plain = nil
	document.etag = nil
	
	return true
	
end

#delete_node(auid, document, selector, xml_namespaces = nil, check_etag = true) ⇒ Object

Delete a node in the document stored in the server.

Example, deleting the node with “id” = “sip:[email protected]”:

@xcapclient.delete_node("pres-rules", nil,
  'cp:ruleset/cp:rule[@id="pres_whitelist"]/cp:conditions/cp:identity/cp:one[@id="sip:[email protected]"]',
  {"cp" => "urn:ietf:params:xml:ns:common-policy"})

If success:

  • The method returns true.

  • Local plain document and ETag are deleted (as the document has changed).



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# File 'lib/xcapclient/client.rb', line 328

def delete_node(auid, document, selector, xml_namespaces=nil, check_etag=true)
	
	application, document = get_app_doc(auid, document)
	response = send_request(:delete, application, document, selector, nil, xml_namespaces, nil, check_etag)
	
	# Reset local plain document and ETag as we have modified it
	document.plain = nil
	document.etag = nil
	
	return true
	
end

#get(auid, document = nil, check_etag = true) ⇒ Object

Fetch a document from the server.

Example:

@xcapclient.get("pres-rules")

If success:

  • The method returns true.

  • Received XML plain document is stored in @xcapclient.application("pres-rules").document.plain (the default document).

  • Received ETag is stored in @xcapclient.application("pres-rules").document.etag.



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# File 'lib/xcapclient/client.rb', line 199

def get(auid, document=nil, check_etag=true)
	
	application, document = get_app_doc(auid, document)
	response = send_request(:get, application, document, nil, nil, nil, nil, check_etag)
	
	# Check Content-Type.
	check_content_type(response, application.mime_type)
	
	# Store the plain document.
	document.plain = response.body.content
	
	# Update ETag.
	document.etag = response.header["ETag"].first
	
	return true
	
end

#get_attribute(auid, document, selector, attribute_name, xml_namespaces = nil, check_etag = true) ⇒ Object

Fetch a node attribute from the document stored in the server.

Example, fetching the “name” attribute of the node with “id” = “sip:[email protected]”:

@xcapclient.get_attribute("pres-rules", nil,
  'cp:ruleset/cp:rule[@id="pres_whitelist"]/cp:conditions/cp:identity/cp:one[@id="sip:[email protected]"]',
  "name",
  {"cp" => "urn:ietf:params:xml:ns:common-policy"})

If success:

  • The method returns the attribute as a String.



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# File 'lib/xcapclient/client.rb', line 355

def get_attribute(auid, document, selector, attribute_name, xml_namespaces=nil, check_etag=true)
	
	application, document = get_app_doc(auid, document)
	response = send_request(:get, application, document, selector + "/@#{attribute_name}", nil, xml_namespaces, nil, check_etag)
	
	# Check Content-Type.
	check_content_type(response, "application/xcap-att+xml")
	
	return response.body.content
	
end

#get_node(auid, document, selector, xml_namespaces = nil, check_etag = true) ⇒ Object

Fetch a node from the document stored in the server.

Example, fetching the node with “id” = “sip:[email protected]”:

@xcapclient.get_node("pres-rules", nil,
  'cp:ruleset/cp:rule[@id="pres_whitelist"]/cp:conditions/cp:identity/cp:one[@id="sip:[email protected]"]',
  {"cp" => "urn:ietf:params:xml:ns:common-policy"})

If success:

  • The method returns the node as a String.



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# File 'lib/xcapclient/client.rb', line 277

def get_node(auid, document, selector, xml_namespaces=nil, check_etag=true)
	
	application, document = get_app_doc(auid, document)
	response = send_request(:get, application, document, selector, nil, xml_namespaces, nil, check_etag)
	
	# Check Content-Type.
	check_content_type(response, "application/xcap-el+xml")
	
	return response.body.content
	
end

#get_node_namespaces(auid, document, selector, xml_namespaces = nil, check_etag = true) ⇒ Object

Fetch the namespace prefixes of a node.

If the client wants to create/replace a node, the body of the PUT request must use the same namespaces and prefixes as those used in the document stored in the server. This methods allows the client to fetch these namespaces and prefixes.

Related documentation: RFC 4825 section 7.10, RFC 4825 section 10

Example:

@xcapclient.get_node_namespaces("pres-rules", nil,
  'ccpp:ruleset/ccpp:rule[@id="pres_whitelist"]',
  { "ccpp" => "urn:ietf:params:xml:ns:common-policy" })

Assuming the server uses “cp” for that namespace, it would reply:

HTTP/1.1 200 OK
Content-Type: application/xcap-ns+xml

<cp:identity xmlns:pr="urn:ietf:params:xml:ns:pres-rules"
  xmlns:cp="urn:ietf:params:xml:ns:common-policy" />

If Nokogiri is available the method returns a hash:

{"pr"=>"urn:ietf:params:xml:ns:pres-rules", "cp"=>"urn:ietf:params:xml:ns:common-policy"}

If not, the method returns the response body as a String and the application must parse it.



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# File 'lib/xcapclient/client.rb', line 453

def get_node_namespaces(auid, document, selector, xml_namespaces=nil, check_etag=true)
	
	application, document = get_app_doc(auid, document)
	response = send_request(:get, application, document, selector + "/namespace::*", nil, xml_namespaces, nil, check_etag)
	
	# Check Content-Type.
	check_content_type(response, "application/xcap-ns+xml")
	
	return case NOKOGIRI_INSTALLED
		when true
			Nokogiri::XML.parse(response.body.content).namespaces
		when false
			response.body.content
		end
	
end

#get_xcap_auids ⇒ Object

Fetch the XCAP applications (auids) supported by the server.

Related documentation: RFC 4825 section 12

If Nokogiri is available the method returns an Array containing the auids. If not, the response body is returned as a String.



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# File 'lib/xcapclient/client.rb', line 478

def get_xcap_auids

	body = get_node("xcap-caps", nil, 'xcap-caps/auids')
	
	return case NOKOGIRI_INSTALLED
		when true
			parse(body).xpath("auids/auid", {"xmlns" => XCAP_CAPS_XMLNS}).map {|auid| auid.content}
		when false
			body
		end

end

#get_xcap_extensions ⇒ Object

Fetch the XCAP extensions supported by the server.

Same as XCAPClient::Client::get_xcap_auids but fetching the supported extensions.



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# File 'lib/xcapclient/client.rb', line 496

def get_xcap_extensions

	body = get_node("xcap-caps", nil, 'xcap-caps/extensions')
	
	return case NOKOGIRI_INSTALLED
		when true
			parse(body).xpath("extensions/extension", {"xmlns" => XCAP_CAPS_XMLNS}).map {|extension| extension.content}
		when false
			body
		end

end

#get_xcap_namespaces ⇒ Object

Fetch the XCAP namespaces supported by the server.

Same as XCAPClient::Client::get_xcap_auids but fetching the supported namespaces.



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# File 'lib/xcapclient/client.rb', line 514

def get_xcap_namespaces

	body = get_node("xcap-caps", nil, 'xcap-caps/namespaces')
	
	return case NOKOGIRI_INSTALLED
		when true
			parse(body).xpath("namespaces/namespace", {"xmlns" => XCAP_CAPS_XMLNS}).map {|namespace| namespace.content}
		when false
			body
		end

end

#put(auid, document = nil, check_etag = true) ⇒ Object

Create/replace a document in the server.

Example:

@xcapclient.put("pres-rules")

If success:

  • The method returns true.

  • Local plain document in @xcapclient.application("pres-rules").document.plain is uploaded to the server.

  • Received ETag is stored in @xcapclient.application("pres-rules").document.etag.



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# File 'lib/xcapclient/client.rb', line 229

def put(auid, document=nil, check_etag=true)
	
	application, document = get_app_doc(auid, document)
	response = send_request(:put, application, document, nil, nil, nil, application.mime_type, check_etag)
	
	# Update ETag.
	document.etag = response.header["ETag"].first
	
	return true
	
end

#put_attribute(auid, document, selector, attribute_name, attribute_value, xml_namespaces = nil, check_etag = true) ⇒ Object

Create/replace a node attribute in the document stored in the server.

Example, creating/replacing the “name” attribute of the node with “id” = “sip:[email protected]” with new value “Alice Yeah”:

@xcapclient.put_attribute("pres-rules", nil,
  'cp:ruleset/cp:rule[@id="pres_whitelist"]/cp:conditions/cp:identity/cp:one[@id="sip:[email protected]"]',
  "name",
  "Alice Yeah",
  {"cp" => "urn:ietf:params:xml:ns:common-policy"})

If success:

  • The method returns true.

  • Local plain document and ETag are deleted (as the document has changed).



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# File 'lib/xcapclient/client.rb', line 383

def put_attribute(auid, document, selector, attribute_name, attribute_value, xml_namespaces=nil, check_etag=true)
	
	application, document = get_app_doc(auid, document)
	response = send_request(:put, application, document, selector + "/@#{attribute_name}", attribute_value, xml_namespaces, "application/xcap-att+xml", check_etag)
	
	# Reset local plain document and ETag as we have modified it.
	document.plain = nil
	document.etag = nil
	
	return true
	
end

#put_node(auid, document, selector, selector_body, xml_namespaces = nil, check_etag = true) ⇒ Object

Create/replace a node in the document stored in the server.

Example, creating/replacing the node with “id” = “sip:[email protected]”:

@xcapclient.put_node("pres-rules", nil,
  'cp:ruleset/cp:rule[@id="pres_whitelist"]/cp:conditions/cp:identity/cp:one[@id="sip:[email protected]"]',
  '<cp:one id="sip:[email protected]"/>',
  {"cp"=>"urn:ietf:params:xml:ns:common-policy"})

If success:

  • The method returns true.

  • Local plain document and ETag are deleted (as the document has changed).



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# File 'lib/xcapclient/client.rb', line 302

def put_node(auid, document, selector, selector_body, xml_namespaces=nil, check_etag=true)
	
	application, document = get_app_doc(auid, document)
	response = send_request(:put, application, document, selector, selector_body, xml_namespaces, "application/xcap-el+xml", check_etag)
	
	# Reset local plain document and ETag as we have modified it.
	document.plain = nil
	document.etag = nil
	
	return true
	
end