modify backend to support separate storage of meta data

1 files changed, 44 insertions, 1 deletions

diff --git a/src/include/anastasis_database_plugin.h b/src/include/anastasis_database_plugin.h
index e5012a6..20e87d1 100644
--- a/src/include/anastasis_database_plugin.h
+++ b/src/include/anastasis_database_plugin.h
@@ -1,6 +1,6 @@
 /*
   This file is part of Anastasis
-  Copyright (C) 2019-2021 Anastasis SARL
+  Copyright (C) 2019-2022 Anastasis SARL
 
   Anastasis is free software; you can redistribute it and/or modify it under the
   terms of the GNU Affero General Public License as published by the Free Software
@@ -159,6 +159,24 @@ typedef bool
 
 
 /**
+ * Function called on matching meta data.  Note that if the client did
+ * not provide meta data for @a version, the function will be called
+ * with @a recovery_meta_data being NULL.
+ *
+ * @param cls closure
+ * @param version the version of the recovery document
+ * @param recovery_meta_data contains meta data about the encrypted recovery document
+ * @param recovery_meta_data_size size of @a recovery_meta_data blob
+ * @return #GNUNET_OK to continue to iterate, #GNUNET_NO to abort iteration
+ */
+typedef enum GNUNET_GenericReturnValue
+(*ANASTASIS_DB_RecoveryMetaCallback)(void *cls,
+                                     uint32_t version,
+                                     const void *recovery_meta_data,
+                                     size_t recovery_meta_data_size);
+
+
+/**
  * Handle to interact with the database.
  *
  * Functions ending with "_TR" run their OWN transaction scope
@@ -329,6 +347,8 @@ struct ANASTASIS_DatabasePlugin
    * @param recovery_data_hash hash of @a data
    * @param recovery_data contains encrypted recovery document
    * @param recovery_data_size size of @a recovery_data blob
+   * @param recovery_meta_data contains meta data about the encrypted recovery document
+   * @param recovery_meta_data_size size of @a recovery_meta_data blob
    * @param payment_secret identifier for the payment, used to later charge on uploads
    * @param[out] version set to the version assigned to the document by the database
    * @return transaction status, 0 if upload could not be finished because @a payment_secret
@@ -342,11 +362,34 @@ struct ANASTASIS_DatabasePlugin
     const struct GNUNET_HashCode *recovery_data_hash,
     const void *recovery_data,
     size_t recovery_data_size,
+    const void *recovery_meta_data,
+    size_t recovery_meta_data_size,
     const struct ANASTASIS_PaymentSecretP *payment_secret,
     uint32_t *version);
 
 
   /**
+   * Fetch recovery document meta data for user. Returns
+   * meta data in descending order from @a max_version.
+   * The size of the result set may be limited.
+   *
+   * @param cls closure
+   * @param account_pub public key of the user's account
+   * @param max_version the maximum version number the user requests
+   * @param cb function to call on each result
+   * @param cb_cls closure for @a cb
+   * @return transaction status
+   */
+  enum GNUNET_DB_QueryStatus
+  (*get_recovery_meta_data)(
+    void *cls,
+    const struct ANASTASIS_CRYPTO_AccountPublicKeyP *account_pub,
+    uint32_t max_version,
+    ANASTASIS_DB_RecoveryMetaCallback cb,
+    void *cb_cls);
+
+
+  /**
    * Fetch recovery document for user according given version.
    *
    * @param cls closure