Harden live mail OAuth and immutable releases

apps/sources/services/imap_import.py

@@ -7,6 +7,7 @@ from typing import Any
 
 from django.conf import settings
 
+from apps.core.services.microsoft365 import acquire_exchange_access_token, xoauth2_bytes
 from apps.sources.models import EmailMessageRecord, MailboxConnection
 from apps.sources.services.email_import import ingest_email, message_identity
 from apps.sources.services.mailbox_connections import decrypt_mailbox_password
@@ -30,7 +31,11 @@ def poll_imap_mailbox(
     if client_factory is None:
         client_factory = imaplib.IMAP4_SSL
     host_validator(f"https://{connection.imap_host}")
-    password = decrypt_mailbox_password(connection)
+    password = (
+        ""
+        if connection.provider == MailboxConnection.Provider.OUTLOOK
+        else decrypt_mailbox_password(connection)
+    )
     client_options = {"timeout": settings.IMAP_CONNECT_TIMEOUT_SECONDS}
     if client_factory is imaplib.IMAP4_SSL:
         client_options["ssl_context"] = trusted_tls_context()
@@ -42,7 +47,13 @@ def poll_imap_mailbox(
         "failed": 0,
     }
     try:
-        client.login(connection.username, password)
+        if connection.provider == MailboxConnection.Provider.OUTLOOK:
+            access_token = acquire_exchange_access_token()
+            client.authenticate(
+                "XOAUTH2", lambda _challenge: xoauth2_bytes(connection.username, access_token)
+            )
+        else:
+            client.login(connection.username, password)
         status, _ = client.select(connection.mailbox, readonly=True)
         if status != "OK":
             raise RuntimeError("IMAP-mailbox kon niet worden geopend")