Fix #1838 (Log message on failed OPDS login)

cps/helper.py

@@ -32,7 +32,7 @@ from tempfile import gettempdir
 import requests
 from babel.dates import format_datetime
 from babel.units import format_unit
-from flask import send_from_directory, make_response, redirect, abort, url_for
+from flask import send_from_directory, make_response, redirect, abort, url_for, request
 from flask_babel import gettext as _
 from flask_login import current_user
 from sqlalchemy.sql.expression import true, false, and_, text
@@ -68,6 +68,7 @@ try:
 except (ImportError, RuntimeError) as e:
     log.debug('Cannot import Image, generating covers from non jpg files will not work: %s', e)
     use_IM = False
+    MissingDelegateError = BaseException
 
 
 # Convert existing book entry to new format

cps/opds.py

@@ -430,7 +430,12 @@ def check_auth(username, password):
             username = username.encode('utf-8')
     user = ub.session.query(ub.User).filter(func.lower(ub.User.nickname) ==
                                             username.decode('utf-8').lower()).first()
-    return bool(user and check_password_hash(str(user.password), password))
+    if bool(user and check_password_hash(str(user.password), password)):
+        return True
+    else:
+        ipAdress = request.headers.get('X-Forwarded-For', request.remote_addr)
+        log.warning('OPDS Login failed for user "%s" IP-address: %s', username.decode('utf-8'), ipAdress)
+        return False
 
 
 def authenticate():