bots: Move contrib_bots to api/bots*.

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

Fix #5009.

bots/encrypt/encrypt.py

@@ -0,0 +1,45 @@
+def encrypt(text):
+    # This is where the actual ROT13 is applied
+    # WHY IS .JOIN NOT WORKING?!
+    textlist = list(text)
+    newtext = ''
+    firsthalf = 'abcdefghijklmABCDEFGHIJKLM'
+    lasthalf = 'nopqrstuvwxyzNOPQRSTUVWXYZ'
+    for char in textlist:
+        if char in firsthalf:
+            newtext += lasthalf[firsthalf.index(char)]
+        elif char in lasthalf:
+            newtext += firsthalf[lasthalf.index(char)]
+        else:
+            newtext += char
+
+    return newtext
+
+class EncryptHandler(object):
+    '''
+    This bot allows users to quickly encrypt messages using ROT13 encryption.
+    It encrypts/decrypts messages starting with @mention-bot.
+    '''
+
+    def usage(self):
+        return '''
+            This bot uses ROT13 encryption for its purposes.
+            It responds to me starting with @mention-bot.
+            Feeding encrypted messages into the bot decrypts them.
+            '''
+
+    def handle_message(self, message, client, state_handler):
+        bot_response = self.get_bot_encrypt_response(message)
+        client.send_reply(message, bot_response)
+
+    def get_bot_encrypt_response(self, message):
+        original_content = message['content']
+        temp_content = encrypt(original_content)
+        send_content = "Encrypted/Decrypted text: " + temp_content
+        return send_content
+
+handler_class = EncryptHandler
+
+if __name__ == '__main__':
+    assert encrypt('ABCDabcd1234') == 'NOPQnopq1234'
+    assert encrypt('NOPQnopq1234') == 'ABCDabcd1234'

bots/encrypt/readme.md

@@ -0,0 +1,16 @@
+About EncryptBot:
+EncryptBot Allows for quick ROT13 encryption in the middle of a chat.
+
+What It Does:
+The bot encrypts any message sent to it on any stream it is subscribed to with ROT13.
+
+How It Works:
+The bot will Use ROT13(A -> N, B -> O... and vice-versa) in a python
+implementation to provide quick and easy encryption.
+
+How to Use:
+
+-Send the message you want to encrypt, add @encrypt to the beginning.
+-The Encrypted message will be sent back to the stream the original
+message was posted in to the topic <sender-email>'s encrypted text.
+-Messages can be decrypted by sending them to EncryptBot in the same way.

bots/encrypt/test_encrypt.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+
+from __future__ import absolute_import
+from __future__ import print_function
+
+import os
+import sys
+
+our_dir = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, os.path.normpath(os.path.join(our_dir)))
+# For dev setups, we can find the API in the repo itself.
+if os.path.exists(os.path.join(our_dir, '..')):
+    sys.path.insert(0, '..')
+from bots_test_lib import BotTestCase
+
+class TestEncryptBot(BotTestCase):
+    bot_name = "encrypt"
+
+    def test_bot(self):
+        expected = {
+            "": "Encrypted/Decrypted text: ",
+            "Let\'s Do It": "Encrypted/Decrypted text: Yrg\'f Qb Vg",
+            "me&mom together..!!": "Encrypted/Decrypted text: zr&zbz gbtrgure..!!",
+            "foo bar": "Encrypted/Decrypted text: sbb one",
+            "Please encrypt this": "Encrypted/Decrypted text: Cyrnfr rapelcg guvf",
+        }
+        self.check_expected_responses(expected)