[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, 22 deletions

diff --git a/src/include/taler_signatures.h b/src/include/taler_signatures.h
index d9fa7065..947c7e83 100644
--- a/src/include/taler_signatures.h
+++ b/src/include/taler_signatures.h
@@ -967,9 +967,9 @@ struct TALER_MasterDelWirePS
 
 /*
  * @brief Signature made by the exchange offline key over the
- * configuration of the age restriction extension.
+ * configuration of an extension.
  */
-struct TALER_MasterExtensionAgeRestrictionPS
+struct TALER_MasterExtensionConfigurationPS
 {
   /**
    * Purpose is #TALER_SIGNATURE_MASTER_EXTENSION.   Signed
@@ -978,29 +978,11 @@ struct TALER_MasterExtensionAgeRestrictionPS
   struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
 
   /**
-   * Bit mask representing the lits of age groups, see TALER_AgeMask for a
-   * description.
+   * Hash of the JSON object that represents the configuration of an extension.
    */
-  struct TALER_AgeMask mask;
+  struct TALER_ExtensionConfigHash h_config GNUNET_PACKED;
 };
 
-#if 0
-/*
- * @brief Signature made by the exchange offline key over the
- * configuration of the peer2peer extension.
- */
-struct TALER_MasterExtensionPeer2PeerPS
-{
-  /**
-   * Purpose is #TALER_SIGNATURE_MASTER_EXTENSION.   Signed
-   * by a `struct TALER_MasterPublicKeyP` using EdDSA.
-   */
-  struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
-
-  // TODO oec
-};
-#endif
-
 /**
  * @brief Information about a denomination key. Denomination keys
  * are used to sign coins of a certain value into existence.