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ruby/lib/xmlrpc/server.rb

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=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>))
* ((<XMLRPC::CGIServer>))
* ((<XMLRPC::ModRubyServer>))
* ((<XMLRPC::Server>))
* ((<XMLRPC::WEBrickServlet>))
= 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 ((<default_handler|XMLRPC::BasicServer#set_default_handler>)) 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 ((<add_handler|XMLRPC::BasicServer#add_handler>)) 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
((<XMLRPC::Client#call|URL:client.html#index:0>)).
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 ((<add_handler|XMLRPC::BasicServer#add_handler>)).
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 ((<new|XMLRPC::BasicServer.new>))
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 ((<add_handler|XMLRPC::BasicServer#add_handler>)).
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
((<XMLRPC::BasicServer>))
== Class Methods
--- XMLRPC::CGIServer.new( *a )
Creates a new (({XMLRPC::CGIServer})) instance. All parameters given
are by-passed to ((<XMLRPC::BasicServer.new>)). 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"
<html>
<head>
<title>#{err}</title>
</head>
<body>
<h1>#{err}</h1>
<p>Unexpected error occured while processing XML-RPC request!</p>
</body>
</html>
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
((<XMLRPC::BasicServer>))
=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"
<html>
<head>
<title>#{err}</title>
</head>
<body>
<h1>#{err}</h1>
<p>Unexpected error occured while processing XML-RPC request!</p>
</body>
</html>
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
((<XMLRPC::WEBrickServlet>))
== 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 ((<serve|XMLRPC::Server#serve>)).
Parameters ((|audit|)) and ((|debug|)) are obsolete!
All additionally given parameters in ((|*a|)) are by-passed to ((<XMLRPC::BasicServer.new>)).
== 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 ((<set_valid_ip|XMLRPC::Server#set_valid_ip>)) specified
valid IP addresses.
== Description
Implements a servlet for use with WEBrick, a pure Ruby (HTTP-) server framework.
== Superclass
((<XMLRPC::BasicServer>))
=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
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