[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, 4 insertions, 19 deletions

diff --git a/src/lib/exchange_api_management_post_extensions.c b/src/lib/exchange_api_management_post_extensions.c
index a2de2454c..862ff7117 100644
--- a/src/lib/exchange_api_management_post_extensions.c
+++ b/src/lib/exchange_api_management_post_extensions.c
@@ -153,32 +153,17 @@ TALER_EXCHANGE_management_post_extensions (
   GNUNET_assert (NULL != extensions);
   for (unsigned int i = 0; i<pkd->num_extensions; i++)
   {
-    json_t *config;
-    const struct TALER_AgeMask *mask;
+    const json_t *config;
     const struct TALER_Extension *ext = &pkd->extensions[i];
 
-    switch (ext->type)
-    {
-    // TODO: case TALER_Extension_Peer2Peer
-    case TALER_Extension_AgeRestriction:
-      mask = (const struct TALER_AgeMask *) (&ext->config);
-      config = GNUNET_JSON_PACK (
-        GNUNET_JSON_pack_string ("extension",
-                                 ext->name),
-        GNUNET_JSON_pack_data_auto ("mask",
-                                    &mask->mask));
-      GNUNET_assert (NULL != config);
-      break;
-    default:
-      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-                  "Extension not supported.\n");
-    }
+    config = ext->config_to_json (ext);
 
+    GNUNET_assert (NULL != config);
     GNUNET_assert (0 ==
                    json_array_append_new (
                      extensions,
                      GNUNET_JSON_PACK (
-                       GNUNET_JSON_pack_data_auto ("name",
+                       GNUNET_JSON_pack_data_auto ("extension",
                                                    &ext->name),
                        GNUNET_JSON_pack_data_auto ("config",
                                                    config)