# Read from file, announce on the web, irc, xml-rpc
from twisted.application import internet, service, strports
from twisted.internet import protocol, reactor, defer, endpoints
from twisted.words.protocols import irc
from twisted.protocols import basic
from twisted.web import resource, server, static, xmlrpc
import cgi

class FingerProtocol(basic.LineReceiver):
    def lineReceived(self, user):
        d = self.factory.getUser(user)

        def onError(err):
            return 'Internal error in server'
        d.addErrback(onError)

        def writeResponse(message):
            self.transport.write(message + '\r\n')
            self.transport.loseConnection()
        d.addCallback(writeResponse)


class IRCReplyBot(irc.IRCClient):
    def connectionMade(self):
        self.nickname = self.factory.nickname
        irc.IRCClient.connectionMade(self)

    def privmsg(self, user, channel, msg):
        user = user.split('!')[0]
        if self.nickname.lower() == channel.lower():
            d = self.factory.getUser(msg)

            def onError(err):
                return 'Internal error in server'
            d.addErrback(onError)

            def writeResponse(message):
                irc.IRCClient.msg(self, user, msg+': '+message)
            d.addCallback(writeResponse)


class FingerService(service.Service):
    def __init__(self, filename):
        self.filename = filename
        self.users = {}

    def _read(self):
        self.users.clear()
        with open(self.filename) as f:
            for line in f:
                user, status = line.split(':', 1)
                user = user.strip()
                status = status.strip()
                self.users[user] = status
        self.call = reactor.callLater(30, self._read)

    def getUser(self, user):
        return defer.succeed(self.users.get(user, "No such user"))

    def getFingerFactory(self):
        f = protocol.ServerFactory()
        f.protocol = FingerProtocol
        f.getUser = self.getUser
        return f

    def getResource(self):
        r = resource.Resource()
        r.getChild = (lambda path, request:
                      static.Data('<h1>%s</h1><p>%s</p>' %
                      tuple(map(cgi.escape,
                      [path,self.users.get(path, "No such user")])),
                      'text/html'))
        x = xmlrpc.XMLRPC()
        x.xmlrpc_getUser = self.getUser
        r.putChild('RPC2', x)
        return r

    def getIRCBot(self, nickname):
        f = protocol.ClientFactory()
        f.protocol = IRCReplyBot
        f.nickname = nickname
        f.getUser = self.getUser
        return f

    def startService(self):
        self._read()
        service.Service.startService(self)

    def stopService(self):
        service.Service.stopService(self)
        self.call.cancel()


application = service.Application('finger', uid=1, gid=1)
f = FingerService('/etc/users')
serviceCollection = service.IServiceCollection(application)
f.setServiceParent(serviceCollection)
strports.service("tcp:79", f.getFingerFactory()
                   ).setServiceParent(serviceCollection)
strports.service("tcp:8000", server.Site(f.getResource())
                   ).setServiceParent(serviceCollection)
internet.ClientService(
    endpoints.clientFromString(reactor, "tcp:irc.freenode.org:6667"),
    f.getIRCBot('fingerbot')).setServiceParent(serviceCollection)
