bots: Move contrib_bots to api/bots*.

This will make it convenient to include these bots in Zulip API
releases on pypi.

Fix #5009.

api/bots/googlesearch/googlesearch.py

@@ -0,0 +1,93 @@
+# See readme.md for instructions on running this code.
+from __future__ import print_function
+import logging
+import http.client
+from six.moves.urllib.request import urlopen
+
+# Uses the Google search engine bindings
+#   pip install --upgrade google
+from google import search
+
+
+def get_google_result(search_keywords):
+    help_message = "To use this bot, start messages with @mentioned-bot, \
+                    followed by what you want to search for. If \
+                    found, Zulip will return the first search result \
+                    on Google.\
+                    \
+                    An example message that could be sent is:\
+                    '@mentioned-bot zulip' or \
+                    '@mentioned-bot how to create a chatbot'."
+    if search_keywords == 'help':
+        return help_message
+    elif search_keywords == '' or search_keywords is None:
+        return help_message
+    else:
+        try:
+            urls = search(search_keywords, stop=20)
+            urlopen('http://216.58.192.142', timeout=1)
+        except http.client.RemoteDisconnected as er:
+            logging.exception(er)
+            return 'Error: No internet connection. {}.'.format(er)
+        except Exception as e:
+            logging.exception(e)
+            return 'Error: Search failed. {}.'.format(e)
+
+        try:
+            url = next(urls)
+        except AttributeError as a_err:
+            # google.search query failed and urls is of object
+            # 'NoneType'
+            logging.exception(a_err)
+            return "Error: Google search failed with a NoneType result. {}.".format(a_err)
+        except TypeError as t_err:
+            # google.search query failed and returned None
+            # This technically should not happen but the prior
+            # error check assumed this behavior
+            logging.exception(t_err)
+            return "Error: Google search function failed. {}.".format(t_err)
+        except Exception as e:
+            logging.exception(e)
+            return 'Error: Search failed. {}.'.format(e)
+
+        return 'Success: {}'.format(url)
+
+
+class GoogleSearchHandler(object):
+    '''
+    This plugin allows users to enter a search
+    term in Zulip and get the top URL sent back
+    to the context (stream or private) in which
+    it was called. It looks for messages starting
+    with @mentioned-bot.
+    '''
+
+    def usage(self):
+        return '''
+            This plugin will allow users to search
+            for a given search term on Google from
+            Zulip. Use '@mentioned-bot help' to get
+            more information on the bot usage. Users
+            should preface messages with
+            @mentioned-bot.
+            '''
+
+    def handle_message(self, message, client, state_handler):
+        original_content = message['content']
+        result = get_google_result(original_content)
+        client.send_reply(message, result)
+
+handler_class = GoogleSearchHandler
+
+
+def test():
+    try:
+        urlopen('http://216.58.192.142', timeout=1)
+        print('Success')
+        return True
+    except http.client.RemoteDisconnected as e:
+        print('Error: {}'.format(e))
+        return False
+
+if __name__ == '__main__':
+    test()