Implement authentication with LDAP

Enable an additional lookup against an LDAP directory
during login and user creation to ensure that only
specific users can login and register on the EteBase
server instance.

etebase_server/settings.py

@@ -164,6 +164,17 @@ if any(os.path.isfile(x) for x in config_locations):
     if 'database' in config:
         DATABASES = { 'default': { x.upper(): y for x, y in config.items('database') } }
 
+    if 'ldap' in config:
+        ldap = config['ldap']
+        ETEBASE_USE_LDAP = True
+        ETEBASE_LDAP_SERVER = ldap.get('server', '')
+        ETEBASE_LDAP_SEARCH_BASE = ldap.get('search_base', '')
+        ETEBASE_LDAP_FILTER = ldap.get('filter', '')
+        ETEBASE_LDAP_BIND_DN = ldap.get('bind_dn', '')
+        ETEBASE_LDAP_BIND_PW = ldap.get('bind_pw', '')
+    else:
+        ETEBASE_USE_LDAP = False
+
 ETEBASE_API_PERMISSIONS = ('rest_framework.permissions.IsAuthenticated', )
 ETEBASE_API_AUTHENTICATORS = ('django_etebase.token_auth.authentication.TokenAuthentication',
                               'rest_framework.authentication.SessionAuthentication')