=begin = xmlrpc/server.rb Copyright (C) 2001, 2002, 2003, 2005 by Michael Neumann (mneumann@ntecs.de) Released under the same term of license as Ruby. = Classes * (()) * (()) * (()) * (()) * (()) = XMLRPC::BasicServer == Description Is the base class for all XML-RPC server-types (CGI, standalone). You can add handler and set a default handler. Do not use this server, as this is/should be an abstract class. === How the method to call is found The arity (number of accepted arguments) of a handler (method or (({Proc})) object) is compared to the given arguments submitted by the client for a RPC ((-Remote Procedure Call-)). A handler is only called if it accepts the number of arguments, otherwise the search for another handler will go on. When at the end no handler was found, the (()) will be called. With this technique it is possible to do overloading by number of parameters, but only for (({Proc})) handler, because you cannot define two methods of the same name in the same class. == Class Methods --- XMLRPC::BasicServer.new( class_delim="." ) Creates a new (({XMLRPC::BasicServer})) instance, which should not be done, because (({XMLRPC::BasicServer})) is an abstract class. This method should be called from a subclass indirectly by a (({super})) call in the method (({initialize})). The paramter ((|class_delim|)) is used in (()) when an object is added as handler, to delimit the object-prefix and the method-name. == Instance Methods --- XMLRPC::BasicServer#add_handler( name, signature=nil, help=nil ) { aBlock } Adds ((|aBlock|)) to the list of handlers, with ((|name|)) as the name of the method. Parameters ((|signature|)) and ((|help|)) are used by the Introspection method if specified, where ((|signature|)) is either an Array containing strings each representing a type of it's signature (the first is the return value) or an Array of Arrays if the method has multiple signatures. Value type-names are "int, boolean, double, string, dateTime.iso8601, base64, array, struct". Parameter ((|help|)) is a String with informations about how to call this method etc. A handler method or code-block can return the types listed at (()). When a method fails, it can tell it the client by throwing an (({XMLRPC::FaultException})) like in this example: s.add_handler("michael.div") do |a,b| if b == 0 raise XMLRPC::FaultException.new(1, "division by zero") else a / b end end The client gets in the case of (({b==0})) an object back of type (({XMLRPC::FaultException})) that has a ((|faultCode|)) and ((|faultString|)) field. --- XMLRPC::BasicServer#add_handler( prefix, obj ) This is the second form of (()). To add an object write: server.add_handler("michael", MyHandlerClass.new) All public methods of (({MyHandlerClass})) are accessible to the XML-RPC clients by (('michael."name of method"')). This is where the ((|class_delim|)) in (()) has it's role, a XML-RPC method-name is defined by ((|prefix|)) + ((|class_delim|)) + (('"name of method"')). --- XMLRPC::BasicServer#add_handler( interface, obj ) This is the third form of (()). Use (({XMLRPC::interface})) to generate an ServiceInterface object, which represents an interface (with signature and help text) for a handler class. Parameter ((|interface|)) must be of type (({XMLRPC::ServiceInterface})). Adds all methods of ((|obj|)) which are defined in ((|interface|)) to the server. This is the recommended way of adding services to a server! --- XMLRPC::BasicServer#get_default_handler Returns the default-handler, which is called when no handler for a method-name is found. It is a (({Proc})) object or (({nil})). --- XMLRPC::BasicServer#set_default_handler ( &handler ) Sets ((|handler|)) as the default-handler, which is called when no handler for a method-name is found. ((|handler|)) is a code-block. The default-handler is called with the (XML-RPC) method-name as first argument, and the other arguments are the parameters given by the client-call. If no block is specified the default of (({XMLRPC::BasicServer})) is used, which raises a XMLRPC::FaultException saying "method missing". --- XMLRPC::BasicServer#set_writer( writer ) Sets the XML writer to use for generating XML output. Should be an instance of a class from module (({XMLRPC::XMLWriter})). If this method is not called, then (({XMLRPC::Config::DEFAULT_WRITER})) is used. --- XMLRPC::BasicServer#set_parser( parser ) Sets the XML parser to use for parsing XML documents. Should be an instance of a class from module (({XMLRPC::XMLParser})). If this method is not called, then (({XMLRPC::Config::DEFAULT_PARSER})) is used. --- XMLRPC::BasicServer#add_introspection Adds the introspection handlers "system.listMethods", "system.methodSignature" and "system.methodHelp", where only the first one works. --- XMLRPC::BasicServer#add_multicall Adds the multi-call handler "system.multicall". --- XMLRPC::BasicServer#get_service_hook Returns the service-hook, which is called on each service request (RPC) unless it's (({nil})). --- XMLRPC::BasicServer#set_service_hook ( &handler ) A service-hook is called for each service request (RPC). You can use a service-hook for example to wrap existing methods and catch exceptions of them or convert values to values recognized by XMLRPC. You can disable it by passing (({nil})) as parameter ((|handler|)) . The service-hook is called with a (({Proc})) object and with the parameters for this (({Proc})). An example: server.set_service_hook {|obj, *args| begin ret = obj.call(*args) # call the original service-method # could convert the return value rescue # rescue exceptions end } =end require "xmlrpc/parser" require "xmlrpc/create" require "xmlrpc/config" require "xmlrpc/utils" # ParserWriterChooseMixin module XMLRPC class BasicServer include ParserWriterChooseMixin include ParseContentType ERR_METHOD_MISSING = 1 ERR_UNCAUGHT_EXCEPTION = 2 ERR_MC_WRONG_PARAM = 3 ERR_MC_MISSING_PARAMS = 4 ERR_MC_MISSING_METHNAME = 5 ERR_MC_RECURSIVE_CALL = 6 ERR_MC_WRONG_PARAM_PARAMS = 7 ERR_MC_EXPECTED_STRUCT = 8 def initialize(class_delim=".") @handler = [] @default_handler = nil @service_hook = nil @class_delim = class_delim @create = nil @parser = nil add_multicall if Config::ENABLE_MULTICALL add_introspection if Config::ENABLE_INTROSPECTION end def add_handler(prefix, obj_or_signature=nil, help=nil, &block) if block_given? # proc-handler @handler << [prefix, block, obj_or_signature, help] else if prefix.kind_of? String # class-handler raise ArgumentError, "Expected non-nil value" if obj_or_signature.nil? @handler << [prefix + @class_delim, obj_or_signature] elsif prefix.kind_of? XMLRPC::Service::BasicInterface # class-handler with interface # add all methods @handler += prefix.get_methods(obj_or_signature, @class_delim) else raise ArgumentError, "Wrong type for parameter 'prefix'" end end self end def get_service_hook @service_hook end def set_service_hook(&handler) @service_hook = handler self end def get_default_handler @default_handler end def set_default_handler (&handler) @default_handler = handler self end def add_multicall add_handler("system.multicall", %w(array array), "Multicall Extension") do |arrStructs| unless arrStructs.is_a? Array raise XMLRPC::FaultException.new(ERR_MC_WRONG_PARAM, "system.multicall expects an array") end arrStructs.collect {|call| if call.is_a? Hash methodName = call["methodName"] params = call["params"] if params.nil? multicall_fault(ERR_MC_MISSING_PARAMS, "Missing params") elsif methodName.nil? multicall_fault(ERR_MC_MISSING_METHNAME, "Missing methodName") else if methodName == "system.multicall" multicall_fault(ERR_MC_RECURSIVE_CALL, "Recursive system.multicall forbidden") else unless params.is_a? Array multicall_fault(ERR_MC_WRONG_PARAM_PARAMS, "Parameter params have to be an Array") else ok, val = call_method(methodName, *params) if ok # correct return value [val] else # exception multicall_fault(val.faultCode, val.faultString) end end end end else multicall_fault(ERR_MC_EXPECTED_STRUCT, "system.multicall expected struct") end } end # end add_handler self end def add_introspection add_handler("system.listMethods",%w(array), "List methods available on this XML-RPC server") do methods = [] @handler.each do |name, obj| if obj.kind_of? Proc methods << name else obj.class.public_instance_methods(false).each do |meth| methods << "#{name}#{meth}" end end end methods end add_handler("system.methodSignature", %w(array string), "Returns method signature") do |meth| sigs = [] @handler.each do |name, obj, sig| if obj.kind_of? Proc and sig != nil and name == meth if sig[0].kind_of? Array # sig contains multiple signatures, e.g. [["array"], ["array", "string"]] sig.each {|s| sigs << s} else # sig is a single signature, e.g. ["array"] sigs << sig end end end sigs.uniq! || sigs # remove eventually duplicated signatures end add_handler("system.methodHelp", %w(string string), "Returns help on using this method") do |meth| help = nil @handler.each do |name, obj, sig, hlp| if obj.kind_of? Proc and name == meth help = hlp break end end help || "" end self end def process(data) method, params = parser().parseMethodCall(data) handle(method, *params) end private # -------------------------------------------------------------- def multicall_fault(nr, str) {"faultCode" => nr, "faultString" => str} end # # method dispatch # def dispatch(methodname, *args) for name, obj in @handler if obj.kind_of? Proc next unless methodname == name else next unless methodname =~ /^#{name}(.+)$/ next unless obj.respond_to? $1 obj = obj.method($1) end if check_arity(obj, args.size) if @service_hook.nil? return obj.call(*args) else return @service_hook.call(obj, *args) end end end if @default_handler.nil? raise XMLRPC::FaultException.new(ERR_METHOD_MISSING, "Method #{methodname} missing or wrong number of parameters!") else @default_handler.call(methodname, *args) end end # # returns true, if the arity of "obj" matches # def check_arity(obj, n_args) ary = obj.arity if ary >= 0 n_args == ary else n_args >= (ary+1).abs end end def call_method(methodname, *args) begin [true, dispatch(methodname, *args)] rescue XMLRPC::FaultException => e [false, e] rescue Exception => e [false, XMLRPC::FaultException.new(ERR_UNCAUGHT_EXCEPTION, "Uncaught exception #{e.message} in method #{methodname}")] end end # # # def handle(methodname, *args) create().methodResponse(*call_method(methodname, *args)) end end =begin = XMLRPC::CGIServer == Synopsis require "xmlrpc/server" s = XMLRPC::CGIServer.new s.add_handler("michael.add") do |a,b| a + b end s.add_handler("michael.div") do |a,b| if b == 0 raise XMLRPC::FaultException.new(1, "division by zero") else a / b end end s.set_default_handler do |name, *args| raise XMLRPC::FaultException.new(-99, "Method #{name} missing" + " or wrong number of parameters!") end s.serve == Description Implements a CGI-based XML-RPC server. == Superclass (()) == Class Methods --- XMLRPC::CGIServer.new( *a ) Creates a new (({XMLRPC::CGIServer})) instance. All parameters given are by-passed to (()). You can only create ((*one*)) (({XMLRPC::CGIServer})) instance, because more than one makes no sense. == Instance Methods --- XMLRPC::CGIServer#serve Call this after you have added all you handlers to the server. This method processes a XML-RPC methodCall and sends the answer back to the client. Make sure that you don't write to standard-output in a handler, or in any other part of your program, this would case a CGI-based server to fail! =end class CGIServer < BasicServer @@obj = nil def CGIServer.new(*a) @@obj = super(*a) if @@obj.nil? @@obj end def initialize(*a) super(*a) end def serve catch(:exit_serve) { length = ENV['CONTENT_LENGTH'].to_i http_error(405, "Method Not Allowed") unless ENV['REQUEST_METHOD'] == "POST" http_error(400, "Bad Request") unless parse_content_type(ENV['CONTENT_TYPE']).first == "text/xml" http_error(411, "Length Required") unless length > 0 # TODO: do we need a call to binmode? $stdin.binmode if $stdin.respond_to? :binmode data = $stdin.read(length) http_error(400, "Bad Request") if data.nil? or data.size != length http_write(process(data), "Content-type" => "text/xml; charset=utf-8") } end private def http_error(status, message) err = "#{status} #{message}" msg = <<-"MSGEND" #{err}

#{err}

Unexpected error occured while processing XML-RPC request!

MSGEND http_write(msg, "Status" => err, "Content-type" => "text/html") throw :exit_serve # exit from the #serve method end def http_write(body, header) h = {} header.each {|key, value| h[key.to_s.capitalize] = value} h['Status'] ||= "200 OK" h['Content-length'] ||= body.size.to_s str = "" h.each {|key, value| str << "#{key}: #{value}\r\n"} str << "\r\n#{body}" print str end end =begin = XMLRPC::ModRubyServer == Description Implements a XML-RPC server, which works with Apache mod_ruby. Use it in the same way as CGIServer! == Superclass (()) =end class ModRubyServer < BasicServer def initialize(*a) @ap = Apache::request super(*a) end def serve catch(:exit_serve) { header = {} @ap.headers_in.each {|key, value| header[key.capitalize] = value} length = header['Content-length'].to_i http_error(405, "Method Not Allowed") unless @ap.request_method == "POST" http_error(400, "Bad Request") unless parse_content_type(header['Content-type']).first == "text/xml" http_error(411, "Length Required") unless length > 0 # TODO: do we need a call to binmode? @ap.binmode data = @ap.read(length) http_error(400, "Bad Request") if data.nil? or data.size != length http_write(process(data), 200, "Content-type" => "text/xml; charset=utf-8") } end private def http_error(status, message) err = "#{status} #{message}" msg = <<-"MSGEND" #{err}

#{err}

Unexpected error occured while processing XML-RPC request!

MSGEND http_write(msg, status, "Status" => err, "Content-type" => "text/html") throw :exit_serve # exit from the #serve method end def http_write(body, status, header) h = {} header.each {|key, value| h[key.to_s.capitalize] = value} h['Status'] ||= "200 OK" h['Content-length'] ||= body.size.to_s h.each {|key, value| @ap.headers_out[key] = value } @ap.content_type = h["Content-type"] @ap.status = status.to_i @ap.send_http_header @ap.print body end end =begin = XMLRPC::Server == Synopsis require "xmlrpc/server" s = XMLRPC::Server.new(8080) s.add_handler("michael.add") do |a,b| a + b end s.add_handler("michael.div") do |a,b| if b == 0 raise XMLRPC::FaultException.new(1, "division by zero") else a / b end end s.set_default_handler do |name, *args| raise XMLRPC::FaultException.new(-99, "Method #{name} missing" + " or wrong number of parameters!") end s.serve == Description Implements a standalone XML-RPC server. The method (({serve}))) is left if a SIGHUP is sent to the program. == Superclass (()) == Class Methods --- XMLRPC::Server.new( port=8080, host="127.0.0.1", maxConnections=4, stdlog=$stdout, audit=true, debug=true, *a ) Creates a new (({XMLRPC::Server})) instance, which is a XML-RPC server listening on port ((|port|)) and accepts requests for the host ((|host|)), which is by default only the localhost. The server is not started, to start it you have to call (()). Parameters ((|audit|)) and ((|debug|)) are obsolete! All additionally given parameters in ((|*a|)) are by-passed to (()). == Instance Methods --- XMLRPC::Server#serve Call this after you have added all you handlers to the server. This method starts the server to listen for XML-RPC requests and answer them. --- XMLRPC::Server#shutdown Stops and shuts the server down. =end class WEBrickServlet < BasicServer; end # forward declaration class Server < WEBrickServlet def initialize(port=8080, host="127.0.0.1", maxConnections=4, stdlog=$stdout, audit=true, debug=true, *a) super(*a) require 'webrick' @server = WEBrick::HTTPServer.new(:Port => port, :BindAddress => host, :MaxClients => maxConnections, :Logger => WEBrick::Log.new(stdlog)) @server.mount("/", self) end def serve signals = %w[INT TERM HUP] & Signal.list.keys signals.each { |signal| trap(signal) { @server.shutdown } } @server.start end def shutdown @server.shutdown end end =begin = XMLRPC::WEBrickServlet == Synopsis require "webrick" require "xmlrpc/server" s = XMLRPC::WEBrickServlet.new s.add_handler("michael.add") do |a,b| a + b end s.add_handler("michael.div") do |a,b| if b == 0 raise XMLRPC::FaultException.new(1, "division by zero") else a / b end end s.set_default_handler do |name, *args| raise XMLRPC::FaultException.new(-99, "Method #{name} missing" + " or wrong number of parameters!") end httpserver = WEBrick::HTTPServer.new(:Port => 8080) httpserver.mount("/RPC2", s) trap("HUP") { httpserver.shutdown } # use 1 instead of "HUP" on Windows httpserver.start == Instance Methods --- XMLRPC::WEBrickServlet#set_valid_ip( *ip_addr ) Specifies the valid IP addresses that are allowed to connect to the server. Each IP is either a (({String})) or a (({Regexp})). --- XMLRPC::WEBrickServlet#get_valid_ip Return the via method (()) specified valid IP addresses. == Description Implements a servlet for use with WEBrick, a pure Ruby (HTTP-) server framework. == Superclass (()) =end class WEBrickServlet < BasicServer def initialize(*a) super require "webrick/httpstatus" @valid_ip = nil end # deprecated from WEBrick/1.2.2. # but does not break anything. def require_path_info? false end def get_instance(config, *options) # TODO: set config & options self end def set_valid_ip(*ip_addr) if ip_addr.size == 1 and ip_addr[0].nil? @valid_ip = nil else @valid_ip = ip_addr end end def get_valid_ip @valid_ip end def service(request, response) if @valid_ip raise WEBrick::HTTPStatus::Forbidden unless @valid_ip.any? { |ip| request.peeraddr[3] =~ ip } end if request.request_method != "POST" raise WEBrick::HTTPStatus::MethodNotAllowed, "unsupported method `#{request.request_method}'." end if parse_content_type(request['Content-type']).first != "text/xml" raise WEBrick::HTTPStatus::BadRequest end length = (request['Content-length'] || 0).to_i raise WEBrick::HTTPStatus::LengthRequired unless length > 0 data = request.body if data.nil? or data.size != length raise WEBrick::HTTPStatus::BadRequest end resp = process(data) if resp.nil? or resp.size <= 0 raise WEBrick::HTTPStatus::InternalServerError end response.status = 200 response['Content-Length'] = resp.size response['Content-Type'] = "text/xml; charset=utf-8" response.body = resp end end end # module XMLRPC =begin = History $Id$ =end