[age restriction] progress 10/n

More work towards support for extensions:
- Prepared statements and DB-plugin-functions for setting and retrieving
  configurations from the database added.
- primitive "registry" of extensions for age restrictions and peer2peer
  (stub)
- TALER_Extensions now with FP for parsing, setting and converting a
  configuration.
- /management/extensions handler now verifies signature of the (opaque)
  json object for all extensions.
- /management/extensions handler calls the FP in the corrensponding
  TALER_Extension for parsing and setting the configuration of a
  particular extension

More work towards age restriction:
- TALER_Extensions interfaces for config-parser, -setter and converter
  implemented for age restriction
- DB event handler now retrieves config from database, parses it and
  sets it (the age mask) in the global extension.
- load_age_mask now loads age mask from the global extension (and not
  from the config file)
- add age_restricted_denoms to /keys response

1 files changed, 49 insertions, 0 deletions

diff --git a/src/util/extensions.c b/src/util/extensions.c
new file mode 100644
index 000000000..87dd16b4d
--- /dev/null
+++ b/src/util/extensions.c
@@ -0,0 +1,49 @@
+/*
+   This file is part of TALER
+   Copyright (C) 2014-2021 Taler Systems SA
+
+   TALER is free software; you can redistribute it and/or modify it under the
+   terms of the GNU General Public License as published by the Free Software
+   Foundation; either version 3, or (at your option) any later version.
+
+   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along with
+   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+/**
+ * @file extensions.c
+ * @brief Utility functions for extensions
+ * @author Özgür Kesim
+ */
+#include "platform.h"
+#include "taler_util.h"
+#include "taler_extensions.h"
+#include "stdint.h"
+
+enum GNUNET_GenericReturnValue
+TALER_extension_get_by_name (const char *name,
+                             const struct TALER_Extension **extensions,
+                             const struct TALER_Extension **ext)
+{
+
+  const struct TALER_Extension *it = *extensions;
+
+  for (; NULL != it; it++)
+  {
+    if (0 == strncmp (name,
+                      it->name,
+                      strlen (it->name)))
+    {
+      *ext = it;
+      return GNUNET_OK;
+    }
+  }
+
+  return GNUNET_NO;
+}
+
+
+/* end of extensions.c */