[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, 11 insertions, 2 deletions

diff --git a/src/include/taler_json_lib.h b/src/include/taler_json_lib.h
index ac8793ebc..102b3a6ff 100644
--- a/src/include/taler_json_lib.h
+++ b/src/include/taler_json_lib.h
@@ -532,7 +532,7 @@ TALER_JSON_wire_to_payto (const json_t *wire_s);
 
 
 /**
- * Hash @a extensions.
+ * Hash @a extensions in deposits.
  *
  * @param extensions contract extensions to hash
  * @param[out] ech where to write the extension hash
@@ -541,6 +541,16 @@ void
 TALER_deposit_extension_hash (const json_t *extensions,
                               struct TALER_ExtensionContractHash *ech);
 
+/**
+ * Hash the @a config of an extension, given as JSON
+ *
+ * @param config configuration of the extension
+ * @param[out] eh where to write the extension hash
+ * @return GNUNET_OK on success, GNUNET_SYSERR on failure
+ */
+enum GNUNET_GenericReturnValue
+TALER_extension_config_hash (const json_t *config,
+                             struct TALER_ExtensionConfigHash *eh);
 
 /**
  * Parses a JSON object { "extension": "age_restriction", "mask": <uint32> }.
@@ -553,7 +563,6 @@ enum GNUNET_GenericReturnValue
 TALER_agemask_parse_json (const json_t *root,
                           struct TALER_AgeMask *mask);
 
-
 #endif /* TALER_JSON_LIB_H_ */
 
 /* End of taler_json_lib.h */