Allow exceptions to directly set the StatusCode in an error response

Signed-off-by: Ivan Kanakarakis <ivan.kanak@gmail.com>

Author: c00kiemon5ter

src/saml2/s_utils.py

@@ -218,29 +218,42 @@ def identity_attribute(form, attribute, forward_map=None):
 
 
 def error_status_factory(info):
-    if isinstance(info, Exception):
+    if not isinstance(info, Exception):
+        (status_code_status_code_value, status_message_text) = info
+    else:
         try:
             exc_val = EXCEPTION2STATUS[info.__class__]
         except KeyError:
             exc_val = samlp.STATUS_AUTHN_FAILED
+
         try:
-            msg = info.args[0]
+            exc_context = info.args[0]
+            err_ctx = (
+                {"status_message_text": exc_context}
+                if isinstance(exc_context, str)
+                else exc_context
+            )
         except IndexError:
-            msg = "%s" % info
-    else:
-        (exc_val, msg) = info
+            err_ctx = {"status_message_text": str(info)}
 
-    if msg:
-        status_msg = samlp.StatusMessage(text=msg)
-    else:
-        status_msg = None
+        status_message_text = err_ctx.get("status_message_text")
+        status_code_status_code_value = err_ctx.get(
+            "status_code_status_code_value", exc_val
+        )
+
+    status_msg = (
+        samlp.StatusMessage(text=status_message_text)
+        if status_message_text
+        else None
+    )
 
     status = samlp.Status(
         status_message=status_msg,
         status_code=samlp.StatusCode(
             value=samlp.STATUS_RESPONDER,
-            status_code=samlp.StatusCode(
-                value=exc_val)))
+            status_code=samlp.StatusCode(value=status_code_status_code_value),
+        ),
+    )
     return status