[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, 10 insertions, 0 deletions

diff --git a/src/json/json.c b/src/json/json.c
index af2b84e27..956aad1a5 100644
--- a/src/json/json.c
+++ b/src/json/json.c
@@ -1009,4 +1009,14 @@ TALER_deposit_extension_hash (const json_t *extensions,
 }
 
 
+enum GNUNET_GenericReturnValue
+TALER_extension_config_hash (const json_t *config,
+                             struct TALER_ExtensionConfigHash *ech)
+{
+  return dump_and_hash (config,
+                        "taler-extension-configuration",
+                        &ech->hash);
+}
+
+
 /* End of json/json.c */