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diff --git a/src/backend/anastasis-httpd_policy-meta.c b/src/backend/anastasis-httpd_policy-meta.c
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+/*
+ This file is part of Anastasis
+ Copyright (C) 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
+ Foundation; either version 3, or (at your option) any later version.
+
+ Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License along with
+ Anastasis; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file anastasis-httpd_policy-meta.c
+ * @brief functions to handle incoming requests on /policy/$PID/meta
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "anastasis-httpd.h"
+#include "anastasis-httpd_policy-meta.h"
+#include "anastasis_service.h"
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_rest_lib.h>
+#include <taler/taler_json_lib.h>
+#include <taler/taler_merchant_service.h>
+#include <taler/taler_signatures.h>
+
+
+/**
+ * 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 with a `json_t *` to build up
+ * @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
+ */
+static enum GNUNET_GenericReturnValue
+build_meta_result (void *cls,
+ uint32_t version,
+ const void *recovery_meta_data,
+ size_t recovery_meta_data_size)
+{
+ json_t *result = cls;
+ char version_s[14];
+
+ GNUNET_snprintf (version_s,
+ sizeof (version_s),
+ "%u",
+ (unsigned int) version);
+ GNUNET_assert (0 ==
+ json_object_set_new (
+ result,
+ version_s,
+ (NULL == recovery_meta_data)
+ ? json_null ()
+ : GNUNET_JSON_from_data (
+ recovery_meta_data,
+ recovery_meta_data_size)));
+ return GNUNET_OK;
+}
+
+
+/**
+ * Return the meta data on recovery documents of @a account on @a
+ * connection.
+ *
+ * @param connection MHD connection to use
+ * @param account_pub account to query
+ * @return MHD result code
+ */
+static MHD_RESULT
+return_policy_meta (
+ struct MHD_Connection *connection,
+ const struct ANASTASIS_CRYPTO_AccountPublicKeyP *account_pub)
+{
+ enum GNUNET_DB_QueryStatus qs;
+ uint32_t max_version;
+ json_t *result;
+
+ {
+ const char *version_s;
+
+ version_s = MHD_lookup_connection_value (connection,
+ MHD_GET_ARGUMENT_KIND,
+ "max_version");
+ if (NULL != version_s)
+ {
+ char dummy;
+
+ if (1 != sscanf (version_s,
+ "%u%c",
+ &max_version,
+ &dummy))
+ {
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_BAD_REQUEST,
+ TALER_EC_GENERIC_PARAMETER_MALFORMED,
+ "version");
+ }
+ }
+ }
+ result = json_object ();
+ GNUNET_assert (NULL != result);
+ qs = db->get_recovery_meta_data (db->cls,
+ account_pub,
+ max_version,
+ &build_meta_result,
+ result);
+
+ switch (qs)
+ {
+ case GNUNET_DB_STATUS_HARD_ERROR:
+ GNUNET_break (0);
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_GENERIC_DB_FETCH_FAILED,
+ "get_recovery_document");
+ case GNUNET_DB_STATUS_SOFT_ERROR:
+ GNUNET_break (0);
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_GENERIC_DB_SOFT_FAILURE,
+ "get_recovery_document");
+ case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_NOT_FOUND,
+ TALER_EC_ANASTASIS_POLICY_NOT_FOUND,
+ NULL);
+ default:
+ /* interesting case below */
+ break;
+ }
+
+ return TALER_MHD_reply_json_steal (connection,
+ result,
+ MHD_HTTP_OK);
+}
+
+
+MHD_RESULT
+AH_policy_meta_get (
+ struct MHD_Connection *connection,
+ const struct ANASTASIS_CRYPTO_AccountPublicKeyP *account_pub)
+{
+ struct GNUNET_HashCode recovery_data_hash;
+ enum ANASTASIS_DB_AccountStatus as;
+ MHD_RESULT ret;
+ uint32_t version;
+ struct GNUNET_TIME_Timestamp expiration;
+
+ as = db->lookup_account (db->cls,
+ account_pub,
+ &expiration,
+ &recovery_data_hash,
+ &version);
+ switch (as)
+ {
+ case ANASTASIS_DB_ACCOUNT_STATUS_PAYMENT_REQUIRED:
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_NOT_FOUND,
+ TALER_EC_SYNC_ACCOUNT_UNKNOWN,
+ NULL);
+ case ANASTASIS_DB_ACCOUNT_STATUS_HARD_ERROR:
+ GNUNET_break (0);
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_GENERIC_DB_FETCH_FAILED,
+ "lookup account");
+ case ANASTASIS_DB_ACCOUNT_STATUS_NO_RESULTS:
+ {
+ struct MHD_Response *resp;
+
+ resp = MHD_create_response_from_buffer (0,
+ NULL,
+ MHD_RESPMEM_PERSISTENT);
+ TALER_MHD_add_global_headers (resp);
+ ret = MHD_queue_response (connection,
+ MHD_HTTP_NO_CONTENT,
+ resp);
+ MHD_destroy_response (resp);
+ }
+ return ret;
+ case ANASTASIS_DB_ACCOUNT_STATUS_VALID_HASH_RETURNED:
+ /* We have results, should fetch and return them! */
+ break;
+ }
+ return return_policy_meta (connection,
+ account_pub);
+}