1 files changed, 154 insertions, 0 deletions
diff --git a/src/exchangedb/pg_select_similar_kyc_attributes.c b/src/exchangedb/pg_select_similar_kyc_attributes.c
new file mode 100644
index 000000000..342f9ef33
--- /dev/null
+++ b/src/exchangedb/pg_select_similar_kyc_attributes.c
@@ -0,0 +1,154 @@
+/*
+   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 exchangedb/pg_select_similar_kyc_attributes.c
+ * @brief Implementation of the select_similar_kyc_attributes function for Postgres
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler_error_codes.h"
+#include "taler_dbevents.h"
+#include "taler_pq_lib.h"
+#include "pg_select_similar_kyc_attributes.h"
+#include "pg_helper.h"
+
+
+/**
+ * Closure for #get_similar_attributes_cb().
+ */
+struct GetAttributesContext
+{
+  /**
+   * Function to call per result.
+   */
+  TALER_EXCHANGEDB_AttributeCallback cb;
+
+  /**
+   * Closure for @e cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Plugin context.
+   */
+  struct PostgresClosure *pg;
+
+  /**
+   * Flag set to #GNUNET_OK as long as everything is fine.
+   */
+  enum GNUNET_GenericReturnValue status;
+
+};
+
+
+/**
+ * Invoke the callback for each result.
+ *
+ * @param cls a `struct GetAttributesContext *`
+ * @param result SQL result
+ * @param num_results number of rows in @a result
+ */
+static void
+get_attributes_cb (void *cls,
+                   PGresult *result,
+                   unsigned int num_results)
+{
+  struct GetAttributesContext *ctx = cls;
+
+  for (unsigned int i = 0; i < num_results; i++)
+  {
+    struct TALER_PaytoHashP h_payto;
+    struct GNUNET_TIME_Timestamp collection_time;
+    struct GNUNET_TIME_Timestamp expiration_time;
+    size_t enc_attributes_size;
+    void *enc_attributes;
+    char *provider;
+    struct GNUNET_PQ_ResultSpec rs[] = {
+      GNUNET_PQ_result_spec_auto_from_type ("h_payto",
+                                            &h_payto),
+      GNUNET_PQ_result_spec_string ("provider",
+                                    &provider),
+      GNUNET_PQ_result_spec_timestamp ("collection_time",
+                                       &collection_time),
+      GNUNET_PQ_result_spec_timestamp ("expiration_time",
+                                       &expiration_time),
+      GNUNET_PQ_result_spec_variable_size ("encrypted_attributes",
+                                           &enc_attributes,
+                                           &enc_attributes_size),
+      GNUNET_PQ_result_spec_end
+    };
+
+    if (GNUNET_OK !=
+        GNUNET_PQ_extract_result (result,
+                                  rs,
+                                  i))
+    {
+      GNUNET_break (0);
+      ctx->status = GNUNET_SYSERR;
+      return;
+    }
+    ctx->cb (ctx->cb_cls,
+             &h_payto,
+             provider,
+             collection_time,
+             expiration_time,
+             enc_attributes_size,
+             enc_attributes);
+    GNUNET_PQ_cleanup_result (rs);
+  }
+}
+
+
+enum GNUNET_DB_QueryStatus
+TEH_PG_select_similar_kyc_attributes (
+  void *cls,
+  const struct GNUNET_ShortHashCode *kyc_prox,
+  TALER_EXCHANGEDB_AttributeCallback cb,
+  void *cb_cls)
+{
+  struct PostgresClosure *pg = cls;
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_auto_from_type (kyc_prox),
+    GNUNET_PQ_query_param_end
+  };
+  struct GetAttributesContext ctx = {
+    .cb = cb,
+    .cb_cls = cb_cls,
+    .pg = pg,
+    .status = GNUNET_OK
+  };
+  enum GNUNET_DB_QueryStatus qs;
+
+  PREPARE (pg,
+           "select_similar_kyc_attributes",
+           "SELECT "
+           " h_payto"
+           ",provider"
+           ",collection_time"
+           ",expiration_time"
+           ",encrypted_attributes"
+           " FROM kyc_attributes"
+           " WHERE kyc_prox=$1");
+  qs = GNUNET_PQ_eval_prepared_multi_select (
+    pg->conn,
+    "select_similar_kyc_attributes",
+    params,
+    &get_attributes_cb,
+    &ctx);
+  if (GNUNET_OK != ctx.status)
+    return GNUNET_DB_STATUS_HARD_ERROR;
+  return qs;
+}