interactive bots: create EncryptBot bot

contrib_bots/lib/EncryptBot/docs.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.

contrib_bots/lib/encrypt_bot.py

@@ -0,0 +1,56 @@
+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 @encrypt.
+    '''
+
+    def usage(self):
+        return '''
+            This bot uses ROT13 encryption for its purposes.
+            It responds to me starting with @encrypt.
+            Feeding encrypted messages into the bot decrypts them.
+            '''
+
+    def triage_message(self, message, client):
+
+        original_content = message['content']
+
+        # This makes sure that the bot only replies to messages it supposed to reply to.
+        should_be_encrypted = original_content.startswith('@encrypt')
+
+        return should_be_encrypted
+
+    def handle_message(self, message, client, state_handler):
+        original_content = message['content']
+        temp_content = encrypt(original_content.replace('@encrypt', ''))
+        send_content = "Encrypted/Decrypted text: " + temp_content
+
+        client.send_message(dict(
+            type='stream',
+            to=message['display_recipient'],
+            subject=message['subject'],
+            content = send_content
+        ))
+
+handler_class = EncryptHandler
+
+if __name__ == '__main__':
+    assert encrypt('ABCDabcd1234') == 'NOPQnopq1234'
+    assert encrypt('NOPQnopq1234') == 'ABCDabcd1234'