[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, 28 insertions, 1 deletions

diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h
index ee691084e..4aa80b674 100644
--- a/src/include/taler_exchangedb_plugin.h
+++ b/src/include/taler_exchangedb_plugin.h
@@ -4025,8 +4025,35 @@ struct TALER_EXCHANGEDB_Plugin
   (*delete_shard_locks)(void *cls);
 
   /**
-   * TODO-oec: add function for adding extension config
+   * Function called to save the configuration of an extension
+   * (age-restriction, peer2peer, ...)
+   *
+   * @param cls the @e cls of this struct with the plugin-specific state
+   * @param extension_name the name of the extension
+   * @param config JSON object of the configuration as string
+   * @param config_sig signature of the configuration by the offline master key
+   * @return transaction status code
    */
+  enum GNUNET_DB_QueryStatus
+  (*set_extension_config)(void *cls,
+                          const char *extension_name,
+                          const char *config,
+                          const struct TALER_MasterSignatureP *config_sig);
+
+  /**
+   * Function called to retrieve the configuration of an extension
+   * (age-restriction, peer2peer, ...)
+   *
+   * @param cls the @e cls of this struct with the plugin-specific state
+   * @param extension_name the name of the extension
+   * @param[out] config JSON object of the configuration as string
+   * @param[out] config_sig signature of the configuration by the master key
+   * @return transaction status code
+   */
+  enum GNUNET_DB_QueryStatus
+  (*get_extension_config)(void *cls,
+                          const char *extension_name,
+                          char **config);
 
 };