Added SATOSABackendNotFoundError exception

Author: peppelinux

src/satosa/exception.py

@@ -38,6 +38,13 @@ class SATOSAUnknownError(SATOSAError):
     pass
 
 
+class SATOSABackendNotFoundError(SATOSAError):
+    """
+    SATOSA Backend not existent/not found
+    """
+    pass
+
+
 class SATOSAAuthenticationError(SATOSAError):
     """
     SATOSA authentication error.

src/satosa/micro_services/custom_routing.py

@@ -5,8 +5,10 @@
 from satosa.logging_util import satosa_logging
 
 from .base import RequestMicroService
-from ..exception import SATOSAConfigurationError
-from ..exception import SATOSAError
+from ..exception import (SATOSAConfigurationError,
+                         SATOSAError,
+                         SATOSABackendNotFoundError)
+
 
 
 logger = logging.getLogger(__name__)
@@ -43,12 +45,19 @@ def get_backend_by_endpoint_path(self, context, native_backend,
         :return: tuple or None
         """
         entity_id = context.request.get('entityID')
+        tr_backend = self.target_mapping.get(entity_id)
+
         if not entity_id:
             return
         if entity_id not in self.target_mapping.keys():
             return
+        if not tr_backend:
+            return
+
+        if not backends.get(tr_backend):
+            raise SATOSABackendNotFoundError("'{}' not found in "
+                                             "proxy_conf.yaml".format(tr_backend))
 
-        tr_backend = self.target_mapping[entity_id]
         tr_path = context.path.replace(native_backend, tr_backend)
         for endpoint in backends[tr_backend]['endpoints']:
             # remove regex trailing chars