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"
}
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.

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"
  },
  "rls-services" => {
    :xmlns => "urn:ietf:params:xml:ns:rls-services",
    :mime_type => "application/rls-services+xml"
  }
}

@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 100

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 with a document "index".
  @applications["xcap-caps"] = Application.new("xcap-caps", {
    :xmlns => "urn:ietf:params:xml:ns:xcap-caps",
    :mime_type => "application/xcap-caps+xml"
  })
  @applications["xcap-caps"].add_document("index", :global)

  # 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 50

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 50

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 50

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 50

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 50

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 50

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 50

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 183

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 189

def applications
  @applications
end

#check_connection ⇒ Object

Checks the TCP connection with the XCAP server.



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# File 'lib/xcapclient/client.rb', line 164

def check_connection
  begin
    Timeout.timeout(HTTP_TIMEOUT) do
      TCPSocket.open @xcap_root.host, @xcap_root.port
    end
  rescue Timeout::Error
    raise Timeout::Error, "cannot connect the XCAP server within #{HTTP_TIMEOUT} seconds"
  rescue => e
    raise e.class, "cannot connect the XCAP server (#{e.message})"
  end
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 258

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 423

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 is deleted (as the document has changed).

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



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# File 'lib/xcapclient/client.rb', line 338

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 as we have modified it.
  document.plain = nil

   # Update ETag.
  document.etag = response.header["ETag"].first

  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 205

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 367

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 283

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 465

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 490

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 508

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 526

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 235

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 395

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 is deleted (as the document has changed).

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



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# File 'lib/xcapclient/client.rb', line 309

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 as we have modified it.
  document.plain = nil

  # Update ETag.
  document.etag = response.header["ETag"].first

  return true

end