1 files changed, 98 insertions, 0 deletions
diff --git a/src/backenddb/pg_lookup_template.c b/src/backenddb/pg_lookup_template.c
new file mode 100644
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--- /dev/null
+++ b/src/backenddb/pg_lookup_template.c
@@ -0,0 +1,98 @@
+/*
+   This file is part of TALER
+   Copyright (C) 2022 Taler Systems SA
+
+   TALER is free software; you can redistribute it and/or modify it under the
+   terms of the GNU General Public License as published by the Free Software
+   Foundation; either version 3, or (at your option) any later version.
+
+   TALER 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along with
+   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+/**
+ * @file backenddb/pg_lookup_template.c
+ * @brief Implementation of the lookup_template function for Postgres
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <taler/taler_error_codes.h>
+#include <taler/taler_dbevents.h>
+#include <taler/taler_pq_lib.h>
+#include "pg_lookup_template.h"
+#include "pg_helper.h"
+
+
+/**
+ * Lookup details about a particular template.
+ *
+ * @param cls closure
+ * @param instance_id instance to lookup template for
+ * @param template_id template to lookup
+ * @param[out] td set to the template details on success, can be NULL
+ *             (in that case we only want to check if the template exists)
+ * @return database result code
+ */
+enum GNUNET_DB_QueryStatus
+TMH_PG_lookup_template (void *cls,
+                        const char *instance_id,
+                        const char *template_id,
+                        struct TALER_MERCHANTDB_TemplateDetails *td)
+{
+  struct PostgresClosure *pg = cls;
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_string (instance_id),
+    GNUNET_PQ_query_param_string (template_id),
+    GNUNET_PQ_query_param_end
+  };
+
+  check_connection (pg);
+  PREPARE (pg,
+           "lookup_template",
+           "SELECT"
+           " mt.template_description"
+           ",mod.otp_id"
+           ",mt.template_contract"
+           " FROM merchant_template mt"
+           " JOIN merchant_instances mi"
+           "   ON (mi.merchant_serial = mt.merchant_serial)"
+           " LEFT JOIN merchant_otp_devices mod"
+           "   ON (mod.otp_serial = mt.otp_device_id)"
+           " WHERE mi.merchant_id=$1"
+           "   AND mt.template_id=$2");
+  if (NULL == td)
+  {
+    struct GNUNET_PQ_ResultSpec rs_null[] = {
+      GNUNET_PQ_result_spec_end
+    };
+
+    return GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
+                                                     "lookup_template",
+                                                     params,
+                                                     rs_null);
+  }
+  else
+  {
+    struct GNUNET_PQ_ResultSpec rs[] = {
+      GNUNET_PQ_result_spec_string ("template_description",
+                                    &td->template_description),
+      GNUNET_PQ_result_spec_allow_null (
+        GNUNET_PQ_result_spec_string ("otp_id",
+                                      &td->otp_id),
+        NULL),
+      TALER_PQ_result_spec_json ("template_contract",
+                                 &td->template_contract),
+      GNUNET_PQ_result_spec_end
+    };
+
+    td->otp_id = NULL;
+    return GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
+                                                     "lookup_template",
+                                                     params,
+                                                     rs);
+  }
+}
+