From 8658b46267349eecf52b756228e02656850fcba1 Mon Sep 17 00:00:00 2001
From: Matěj Cepl <mcepl@cepl.eu>
Date: Thu, 2 Jul 2020 18:07:52 +0200
Subject: Collect capabilities and don't EXPUNGE on servers, which don't
 support it.

---
 check_bogofilter.py | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/check_bogofilter.py b/check_bogofilter.py
index ed95651..c36cf44 100755
--- a/check_bogofilter.py
+++ b/check_bogofilter.py
@@ -4,6 +4,7 @@ import logging
 import os.path
 import re
 import subprocess
+from collections import namedtuple
 from ConfigParser import ConfigParser
 
 logging.basicConfig(format='%(levelname)s:%(funcName)s:%(message)s',
@@ -14,6 +15,10 @@ log = logging.getLogger('check_bogofilter')
 
 pattern_uid = re.compile(r'\d+ \(UID (?P<uid>\d+)\)')
 
+# Store capabilities present in the current server
+# Add additional ones as needed
+AvailableCapabilities = namedtuple('Capas', ['MOVE', 'UIDPLUS'])
+
 
 def parse_uid(data):
     match = pattern_uid.match(data)
@@ -26,8 +31,8 @@ def move_messages(ids, target):
         ids_str = ','.join(ids)
         client.uid('COPY', ids_str, target)
         client.uid('STORE', ids_str, '+FLAGS', r'(\Deleted)')
-        # requires UIDPLUS extension in CAPABILITIES
-        client.uid('EXPUNGE', ids_str)
+        if client._features_available.UIDPLUS:
+            client.uid('EXPUNGE', ids_str)
 
 
 def process_folder(proc_fld_name, target_fld, unsure_fld, spam_fld=None,
@@ -92,7 +97,7 @@ def process_folder(proc_fld_name, target_fld, unsure_fld, spam_fld=None,
             client.uid('STORE', ','.join(ham_msgs), '-FLAGS', r'(\Seen)')
     if spam_msgs:
         if spam_fld is not None:
-	    move_messages(spam_msgs, spam_fld)
+            move_messages(spam_msgs, spam_fld)
         else:
             client.uid('STORE', ','.join(spam_msgs),
                        '+FLAGS.SILENT', r'(\Deleted \Seen)')
@@ -102,6 +107,7 @@ def process_folder(proc_fld_name, target_fld, unsure_fld, spam_fld=None,
 
     return proc_msg_count
 
+
 processedCounter = 0
 config = ConfigParser()
 config.read(os.path.expanduser("~/.bogofilter-imap-train-rc"))
@@ -110,8 +116,16 @@ login = config.get("imap-training", "login")
 password = config.get("imap-training", "password")
 server = config.get("imap-training", "server")
 client = imaplib.IMAP4_SSL(server)
+client._features_available = AvailableCapabilities(False, False)
 client.login(login, password)
 
+ok, dat = client.capability()
+if ok != 'OK':
+    raise client.error(dat[-1])
+capas = dat[0].decode()
+client._features_available = AvailableCapabilities._make(
+    ['MOVE' in capas, 'UIDPLUS' in capas])
+
 processedCounter += process_folder('INBOX', '_suspects', '_unsure', '_spam')
 
 client.logout()
-- 
cgit