refinements of policy extension APIs

1 files changed, 49 insertions, 0 deletions

diff --git a/src/extensions/extensions.c b/src/extensions/extensions.c
index 02137d31..64574fc2 100644
--- a/src/extensions/extensions.c
+++ b/src/extensions/extensions.c
@@ -353,4 +353,53 @@ TALER_extensions_load_manifests (
 }
 
 
+enum GNUNET_GenericReturnValue
+TALER_extensions_from_policy_details (
+  const json_t *policy_details,
+  const struct TALER_Extension **extension,
+  char **error_hint)
+{
+  const json_t *jtype;
+  const char *type;
+
+  *extension = NULL;
+  *error_hint = NULL;
+
+  if ((NULL == policy_details) ||
+      (! json_is_object (policy_details)))
+  {
+    *error_hint = "invalid policy object";
+    return GNUNET_SYSERR;
+  }
+
+  jtype = json_object_get (policy_details, "type");
+  if (NULL == jtype)
+  {
+    *error_hint = "no type in policy object";
+    return GNUNET_SYSERR;
+  }
+
+  type = json_string_value (jtype);
+  if (NULL == type)
+  {
+    *error_hint = "invalid type in policy object";
+    return GNUNET_SYSERR;
+  }
+
+  *extension = TALER_extensions_get_by_name (type);
+  if ((NULL == *extension) ||
+      (NULL == (*extension)->parse_policy_details))
+  {
+    GNUNET_break (0);
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                "Unsupported extension policy '%s' requested\n",
+                type);
+    *extension = NULL;
+    return GNUNET_NO;
+  }
+
+  return GNUNET_OK;
+}
+
+
 /* end of extensions.c */