Google Translation plugin added (proof-of-concept) that translates incoming chat messages from English to French using Google Translate service.

Plugin object that registered new event is accessible in that event now, through self.plugin.

plugins/google_translation/__init__.py

@@ -0,0 +1 @@
+from plugin import GoogleTranslationPlugin

plugins/google_translation/plugin.py

@@ -0,0 +1,115 @@
+# -*- coding: utf-8 -*-
+##
+## This file is part of Gajim.
+##
+## Gajim is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published
+## by the Free Software Foundation; version 3 only.
+##
+## Gajim is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Gajim.  If not, see <http://www.gnu.org/licenses/>.
+##
+'''
+Google Translation plugin.
+
+Translates (currently only incoming) messages using Google Translate.
+
+:note: consider this as proof-of-concept
+:author: Mateusz Biliński <mateusz@bilinski.it>
+:since: 25th August 2008
+:copyright: Copyright (2008) Mateusz Biliński <mateusz@bilinski.it>
+:license: GPL
+'''
+
+import re
+import urllib2
+import new
+from pprint import pformat
+
+from common import helpers
+from common import gajim
+
+from plugins import GajimPlugin
+from plugins.helpers import log_calls, log
+from common import ged
+from common import nec
+
+class GoogleTranslationPlugin(GajimPlugin):
+	name = u'Google Translation'
+	short_name = u'google_translation'
+	version = u'0.1'
+	description = u'''Translates (currently only incoming) messages using Google Translate.'''
+	authors = [u'Mateusz Biliński <mateusz@bilinski.it>']
+	homepage = u'http://blog.bilinski.it'
+	
+	@log_calls('GoogleTranslationPlugin')
+	def init(self):
+		self.config_dialog = None
+		#self.gui_extension_points = {}
+		self.config_default_values = {'from_lang' : ('en', _('Language of text to be translated')),
+									  'to_lang' : ('fr', _('Language to which translation will be made')),
+									  'user_agent' : ('Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.12) Gecko/20080213 Firefox/2.0.0.11',
+													  _('User Agent data to be used with urllib2 when connecting to Google Translate service'))}
+		
+		#self.events_handlers = {}
+		
+		self.events = [GoogleTranslateMessageReceivedEvent]
+		
+		self.translated_text_re = \
+			re.compile(r'google.language.callbacks.id100\(\'22\',{"translatedText":"(?P<text>[^"]*)"}, 200, null, 200\)')
+		
+	def translate_text(self, text, from_lang, to_lang):
+		text = self.prepare_text_for_url(text)
+		headers = { 'User-Agent' : self.config['user_agent'] }
+		translation_url = 'http://www.google.com/uds/Gtranslate?callback=google.language.callbacks.id100&context=22&q=%(text)s&langpair=%(from_lang)s%%7C%(to_lang)s&key=notsupplied&v=1.0'%locals()
+		
+		request = urllib2.Request(translation_url, headers=headers)
+		response = urllib2.urlopen(request)
+		results = response.read()
+		
+		translated_text = self.translated_text_re.search(results).group('text')
+		
+		return translated_text
+	
+	def prepare_text_for_url(self, text):
+		'''
+		Converts text so it can be used within URL as query to Google Translate.
+		'''
+		
+		# There should be more replacements for plugin to work in any case:
+		char_replacements = { ' ' : '%20',
+							  '+' : '%2B'}
+		
+		for char, replacement in char_replacements.iteritems():
+			text = text.replace(char, replacement)
+			
+		return text
+		
+	def activate(self):
+		pass
+		
+	def deactivate(self):
+		pass
+	
+class GoogleTranslateMessageReceivedEvent(nec.NetworkIncomingEvent):
+	name = 'google-translate-message-received'
+	base_network_events = ['raw-message-received']
+	
+	def generate(self):
+		msg_type = self.base_event.xmpp_msg.attrs['type']
+		if msg_type == u'chat':
+			msg_text = "".join(self.base_event.xmpp_msg.kids[0].data)
+			if msg_text:
+				from_lang = self.plugin.config['from_lang']
+				to_lang = self.plugin.config['to_lang']
+				self.base_event.xmpp_msg.kids[0].setData(
+					self.plugin.translate_text(msg_text, from_lang, to_lang))
+			
+		return False 	# We only want to modify old event, not emit another,
+						# so we return False here.
+						

src/plugins/pluginmanager.py

@@ -256,6 +256,7 @@ class PluginManager(object):
 			
 	def _register_network_events_in_nec(self, plugin):
 		for event_class in plugin.events:
+			setattr(event_class, 'plugin', plugin)
 			if issubclass(event_class, nec.NetworkIncomingEvent):
 				gajim.nec.register_incoming_event(event_class)
 			elif issubclass(event_class, nec.NetworkOutgoingEvent):