adding new xmpp wikibot example

appengine/standard/xmpp_wikibot/README.md

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+# Uncyclobot example that can be run on Google Compute Engine
+
+This sample shows how to use the [SleekXMPP](http://sleekxmpp.com/index.html)
+client and [Flask](http://flask.pocoo.org/) to build a simple chatbot that can
+be run on [Google Compute Engine](https://cloud.google.com/compute/). The
+chatbot does two things:
+
+1. Sends messages to XMPP users via http get:
+	* The server is running on port 5000
+	* if running on virtual machine use: http://<MACHINE IP>:5000/send_message?recipient=<RECIPIENT ADDRESS>&message=<MSG>
+	* If running locally use: http://localhost:5000/send_message?recipient=<RECIPIENT ADDRESS>&message=<MSG>
+
+2. Responds to incoming messages with a Uncyclopedia page on the topic:
+	* Send a message with a topic (e.g., 'Hawaii') to the XMPP account the server is using
+	* It should respond with a Uncyclopedia page (when one exists)
+
+## Setup
+
+Follow the instructions at the 
+[Compute Engine Quickstart Guide](https://cloud.google.com/compute/docs/quickstart-linux)
+on how to create a project, create a virtual machine, and connect to your
+instance via SSH. Once you have done this, you may jump to 
+[Installing files and dependencies](#installing-files-and-dependencies).
+
+You should also download the [Google Cloud SDK](https://cloud.google.com/sdk/).
+It will allow you to access many of the features of Google Compute Engine via
+your local machine.
+
+**IMPORTANT** You must enable tcp traffic on port 5000 to send messages to the
+XMPP server. This can be done by running the following SDK commands:
+
+    gcloud config set project <YOUR PROJECT NAME>
+
+    gcloud compute firewall-rules create wikibot-server-rule --allow tcp:5000 --source-ranges=0.0.0.0/0
+
+Or you can create a new firewall rule via the UI in the 
+[Networks](https://console.cloud.google.com/networking/networks/list) section of
+the Google Cloud Console.
+
+### Installing files and dependencies
+
+First, install the `wikibot.py` and `requirements.txt` files onto your remote 
+instance. See the guide on
+[Transferring Files](https://cloud.google.com/compute/docs/instances/transfer-files)
+for more information on how to do this using the Mac file browser, `scp`, or
+the Google Cloud SDK.
+
+Before running or deploying this application, you must install the dependencies
+using [pip](http://pip.readthedocs.io/en/stable/):
+
+    pip install -r requirements.txt
+
+
+## Running the sample
+
+You'll need to have an XMPP account prior to actually running the sample.
+If you do not have one, you can easily create an account at one of the many
+XMPP servers such as [Jabber.at](https://jabber.at/account/register/).
+Once you have an account, run the following command:
+
+    python wikibot.py -j '<YOUR XMPP USERNAME>' -p '<PASSWORD>'
+
+Where the username (e.g., '[email protected]') and password for the account that
+you'd like to use for your chatbot are passed in as arguments.
+
+Enter control-Z to stop the server
+
+
+### Running on your local machine
+
+You may also run the sample locally by simply copying `wikibot.py` to a project
+directory and installing all python dependencies there.

appengine/standard/xmpp_wikibot/requirements.txt

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+Flask==0.11.1
+requests==2.11.1
+sleekxmpp==1.3.1

appengine/standard/xmpp_wikibot/wikibot.py

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+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Uncyclobot server example using SleekXMPP client library"""
+
+import json
+import logging
+from optparse import OptionParser
+import sys
+import threading
+import urllib
+
+from flask import Flask, request
+import requests
+import sleekxmpp
+
+# Python versions before 3.0 do not use UTF-8 encoding
+# by default. To ensure that Unicode is handled properly
+# throughout SleekXMPP, we will set the default encoding
+# ourselves to UTF-8.
+if sys.version_info < (3, 0):
+    from sleekxmpp.util.misc_ops import setdefaultencoding
+    setdefaultencoding('utf8')
+else:
+    raw_input = input
+
+app = Flask(__name__)
+
+chat_client = None #this will be initialized when the wikibot is constructed
+
+@app.route('/send_message', methods=['GET'])
+def send_message():
+    try:
+        recipient = request.args.get('recipient')
+        message = request.args.get('message')
+    except KeyError as e:
+        logging.info('key error: {0}'.format(e))
+
+    if chat_client and recipient and message:
+        chat_client.send_message(mto=recipient, mbody=message)
+        return 'message sent to:' + recipient + ' with body:' + message
+    else:
+        logging.info('chat client or recipient or message does not exist!')
+    return 'message failed to send'
+
+def run_server():
+    app.run(threaded=False, use_reloader=False, host='0.0.0.0')
+
+class UncycloBot(sleekxmpp.ClientXMPP):
+
+    """
+    A simple SleekXMPP bot that will take messages, look up their content
+    on wikipedia and provide a link to the page if it exists
+    """
+
+    def __init__(self, jid, password):
+        sleekxmpp.ClientXMPP.__init__(self, jid, password)
+
+        # The session_start event will be triggered when
+        # the bot establishes its connection with the server
+        # and the XML streams are ready for use. We want to
+        # listen for this event so that we we can initialize
+        # our roster.
+        self.add_event_handler('session_start', self.start)
+
+        # The message event is triggered whenever a message
+        # stanza is received. Be aware that that includes
+        # MUC messages and error messages.
+        self.add_event_handler('message', self.message)
+
+    def start(self, event):
+        """
+        Process the session_start event.
+        Typical actions for the session_start event are
+        requesting the roster and broadcasting an initial
+        presence stanza.
+        Arguments:
+            event -- An empty dictionary. The session_start
+                     event does not provide any additional
+                     data.
+        """
+        self.send_presence()
+        self.get_roster()
+
+    def message(self, msg):
+        """
+        Process incoming message stanzas. Be aware that this also
+        includes MUC messages and error messages. It is usually
+        a good idea to check the messages's type before processing
+        or sending replies. If the message is the appropriate type,
+        then the bot checks wikipedia to see if the message string
+        exists as a page on the site. If so, it sends this link back
+        to the sender in the reply.
+        Arguments:
+            msg -- The received message stanza. See the SleekXMPP documentation
+                   for stanza objects and the Message stanza to see
+                   how it may be used.
+        """
+        if msg['type'] in ('chat', 'normal'):
+            msg_body = '%(body)s' % msg
+            logging.info('Message sent was: ' + msg_body)
+            encoded_body = urllib.quote_plus(msg_body)
+            svr_response = requests.get('https://en.wikipedia.org/w/api.php?action=parse&prop=sections&format=json&page=' + encoded_body)
+            doc = json.loads(svr_response.content)
+            try:
+                page_id = str(doc['parse']['pageid'])
+                defn_url = 'https://en.wikipedia.org/?curid=' + page_id
+                msg.reply("find out more about: '" + msg_body + "' here: " + defn_url).send()
+            except KeyError as e:
+                logging.info('key error: {0}'.format(e))
+                msg.reply("I wasn't able to locate info on: '" + msg_body + "' Sorry").send()
+
+
+
+
+if __name__ == '__main__':
+    # Setup the command line arguments.
+    optp = OptionParser()
+
+    # Output verbosity options.
+    optp.add_option('-q', '--quiet', help='set logging to ERROR',
+                    action='store_const', dest='loglevel',
+                    const=logging.ERROR, default=logging.INFO)
+    optp.add_option('-d', '--debug', help='set logging to DEBUG',
+                    action='store_const', dest='loglevel',
+                    const=logging.DEBUG, default=logging.INFO)
+    optp.add_option('-v', '--verbose', help='set logging to COMM',
+                    action='store_const', dest='loglevel',
+                    const=5, default=logging.INFO)
+
+    # JID and password options.
+    optp.add_option("-j", "--jid", dest="jid",
+                    help="JID to use")
+    optp.add_option("-p", "--password", dest="password",
+                    help="password to use")
+
+    opts, args = optp.parse_args()
+
+    # Setup logging.
+    logging.basicConfig(level=opts.loglevel,
+                        format='%(levelname)-8s %(message)s')
+
+
+    # Setup the UncycloBot and register plugins. Note that while plugins may
+    # have interdependencies, the order in which you register them does
+    # not matter.
+    xmpp = UncycloBot(opts.jid, opts.password)
+    xmpp.register_plugin('xep_0030') # Service Discovery
+    xmpp.register_plugin('xep_0004') # Data Forms
+    xmpp.register_plugin('xep_0060') # PubSub
+    xmpp.register_plugin('xep_0199') # XMPP Ping
+
+    chat_client = xmpp # set the global variable
+
+    # If you are connecting to Facebook and wish to use the
+    # X-FACEBOOK-PLATFORM authentication mechanism, you will need
+    # your API key and an access token. Then you'll set:
+    # xmpp.credentials['api_key'] = 'THE_API_KEY'
+    # xmpp.credentials['access_token'] = 'THE_ACCESS_TOKEN'
+
+    # If you are connecting to MSN, then you will need an
+    # access token, and it does not matter what JID you
+    # specify other than that the domain is 'messenger.live.com',
+    # so '[email protected]' will work. You can specify
+    # the access token as so:
+    # xmpp.credentials['access_token'] = 'THE_ACCESS_TOKEN'
+
+    # If you are working with an OpenFire server, you may need
+    # to adjust the SSL version used:
+    # xmpp.ssl_version = ssl.PROTOCOL_SSLv3
+
+    # If you want to verify the SSL certificates offered by a server:
+    # xmpp.ca_certs = "path/to/ca/cert"
+
+    # start the app server and run it as a thread so that the XMPP server may also start
+    threading.Thread(target=run_server).start()
+
+    # Connect to the XMPP server and start processing XMPP stanzas.
+    if xmpp.connect():
+        # If you do not have the dnspython library installed, you will need
+        # to manually specify the name of the server if it does not match
+        # the one in the JID. For example:
+        #
+        # if xmpp.connect(('<SERVER DOMAIN>.com', 5222)):
+        #     ...
+        xmpp.process(block=True)
+        print("Done")
+    else:
+        print("Unable to connect.")