Acknowledge receipt of help messages

remindme.py

@@ -0,0 +1,83 @@
+#!/bin/env/python3
+import os
+import email
+from datetime import datetime
+
+from imapclient import IMAPClient
+from smtplib import SMTP_SSL
+
+from dateutil.parser import parse as d_parse
+from cron_descriptor import get_description
+from croniter import croniter
+
+
+help_text = """
+A very comprehensive help text
+"""
+
+
+def ack_message(uid, message, client):
+    msg = email.message_from_bytes(message[b"RFC822"])
+    if msg.is_multipart():
+        print("Deleting multipart message")
+        return None, True
+        client.delete_messages([uid])
+
+    payload = msg.get_payload().strip()
+    if payload.startswith("help"):
+        print("We should help")
+        reply = email.message.EmailMessage() 
+        reply.set_content(help_text)
+        reply["Subject"] = f"Help for remindme service (was {msg['Subject']})"
+        reply["Message-ID"] = email.utils.make_msgid()
+        reply["In-Reply-To"] = msg["Message-ID"]
+        reply["References"] = msg["Message-ID"]
+        reply["To"] = msg["Reply-To"] or msg["From"]
+        reply["From"] = "remindme@friedersdorff.com"
+        return reply, True
+    if payload.startswith("repeat"): 
+        try:
+            print(get_description(payload))
+            it = croniter(payload, datetime.now())
+            print(it.get_next(datetime))
+        except Exception as e:
+            print("Invalid Cron: ", e)
+        return None, False
+
+    date = d_parse(payload)
+    print(date)
+
+    return None, False
+
+
+def main():
+    mhost = "mail.friedersdorff.com"
+    user = os.environ["REMINDME_USERNAME"]
+    passwd = os.environ["REMINDME_PASS"]
+    with IMAPClient(host=mhost) as iclient, SMTP_SSL(mhost) as sclient:
+        print("Inside context manager")
+        iclient.login(user, passwd)
+        sclient.login(user, passwd)
+        iclient.select_folder("INBOX")
+
+        unseen_msgs = iclient.fetch(iclient.search(["UNSEEN"]), 'RFC822')
+        for uid, message in unseen_msgs.items():
+            print(uid)
+            reply, delete = ack_message(uid, message, iclient)
+
+            try:
+                if reply:
+                    print("Replying to message")
+                    print("reply")
+                    sclient.send_message(reply)
+                if delete:
+                    print("Deleting message")
+                    #iclient.delete_messages([uid])
+                else:
+                    print("Setting msg as seen")
+                    #iclient.set_flags([uid], [r"\SEEN"]) 
+            except Exception as e:
+                print("An error occured", e)
+
+if __name__ == "__main__":
+    main()