From 1adb5df1e25068ff9db8c584d05cd3f67f30fc46 Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Sat, 23 Apr 2022 21:57:00 +0200
Subject: [PATCH] Added a Sieve filter for automatic processing of login codes
---
code/README | 4 ++++
code/zoom-code | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 56 insertions(+)
create mode 100644 code/README
create mode 100755 code/zoom-code
diff --git a/code/README b/code/README
new file mode 100644
index 0000000..1c0d89b
--- /dev/null
+++ b/code/README
@@ -0,0 +1,4 @@
+Copy zoom-code to /usr/local/lib/dovecot/sieve-pipe/, so that it can be
+executed by Sieve.
+
+Set up Sieve to pipe e-mail with the right subject to this filter.
diff --git a/code/zoom-code b/code/zoom-code
new file mode 100755
index 0000000..88653d2
--- /dev/null
+++ b/code/zoom-code
@@ -0,0 +1,52 @@
+#!/usr/bin/python3
+# Sieve pipe handler for processing Zoom login codes
+
+import email
+import email.policy
+import os
+import re
+import subprocess
+import sys
+import syslog
+from tempfile import NamedTemporaryFile
+
+def fail(msg):
+ syslog.syslog(syslog.LOG_ERR, msg)
+ sys.exit(0)
+
+def mumble(msg):
+ syslog.syslog(syslog.LOG_INFO, msg)
+
+def main():
+ msg = email.message_from_file(sys.stdin, policy=email.policy.default)
+ to = msg.get('To', "")
+ m = re.match('(zoom(-m)?-[0-9]{1,2})@', to)
+ if not m:
+ fail('Cannot determine recipient account')
+ user = m[1]
+
+ body = msg.get_body()
+ body_ct = body.get_content_type()
+ if body_ct == 'text/html':
+ tmpf = NamedTemporaryFile(mode='w')
+ tmpf.write(body.get_content())
+ tmpf.flush()
+
+ res = subprocess.run(['/usr/bin/lynx', '-force_html', '-nolist', '-display_charset=utf-8', '-dump', tmpf.name], stdout=subprocess.PIPE, text=True)
+ if res.returncode != 0:
+ fail(f'Subprocess failed with return code {res.returncode}')
+
+ out = res.stdout
+ else:
+ out = body.get_content()
+
+ os.umask(0o022)
+ with open(f"/srv/mffzoom/code/www/{user}.txt", "w") as f:
+ f.write(out)
+
+try:
+ syslog.openlog('zoom-code')
+ main()
+ mumble('Login code stored')
+except Exception as e:
+ fail(str(e))
--
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