add C client API for DELETE /transfers/ID operation (#6876)

2 files changed, 188 insertions, 0 deletions

diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index 08ef97ab..52d6dd84 100644
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -19,6 +19,7 @@ libtalermerchant_la_SOURCES = \
   merchant_api_delete_order.c \
   merchant_api_delete_product.c \
   merchant_api_delete_reserve.c \
+  merchant_api_delete_transfer.c \
   merchant_api_get_config.c \
   merchant_api_get_instance.c \
   merchant_api_get_instances.c \
diff --git a/src/lib/merchant_api_delete_transfer.c b/src/lib/merchant_api_delete_transfer.c
new file mode 100644
index 00000000..9a040753
--- /dev/null
+++ b/src/lib/merchant_api_delete_transfer.c
@@ -0,0 +1,187 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2021 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU Lesser General Public License as published by the Free Software
+  Foundation; either version 2.1, 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 Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License along with
+  TALER; see the file COPYING.LGPL.  If not, see
+  <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file merchant_api_delete_transfer.c
+ * @brief Implementation of the DELETE /transfer/$ID request of the merchant's HTTP API
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <curl/curl.h>
+#include <jansson.h>
+#include <microhttpd.h> /* just for HTTP status codes */
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_merchant_service.h"
+#include <taler/taler_json_lib.h>
+#include <taler/taler_signatures.h>
+
+
+/**
+ * Handle for a DELETE /transfers/$ID operation.
+ */
+struct TALER_MERCHANT_TransferDeleteHandle
+{
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_MERCHANT_TransferDeleteCallback cb;
+
+  /**
+   * Closure for @a cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Reference to the execution context.
+   */
+  struct GNUNET_CURL_Context *ctx;
+
+};
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP GET /transfers/$ID request.
+ *
+ * @param cls the `struct TALER_MERCHANT_TransferDeleteHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response response body, NULL if not in JSON
+ */
+static void
+handle_delete_transfer_finished (void *cls,
+                                long response_code,
+                                const void *response)
+{
+  struct TALER_MERCHANT_TransferDeleteHandle *tdh = cls;
+  const json_t *json = response;
+  struct TALER_MERCHANT_HttpResponse hr = {
+    .http_status = (unsigned int) response_code,
+    .reply = json
+  };
+
+  tdh->job = NULL;
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Got /transfers/$ID response with status code %u\n",
+              (unsigned int) response_code);
+  switch (response_code)
+  {
+  case MHD_HTTP_NO_CONTENT:
+    break;
+  case MHD_HTTP_UNAUTHORIZED:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    /* Nothing really to verify, merchant says we need to authenticate. */
+    break;
+  case MHD_HTTP_NOT_FOUND:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    break;
+  case MHD_HTTP_CONFLICT:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    break;
+  default:
+    /* unexpected response code */
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Unexpected response code %u/%d\n",
+                (unsigned int) response_code,
+                (int) hr.ec);
+    break;
+  }
+  tdh->cb (tdh->cb_cls,
+           &hr);
+  TALER_MERCHANT_transfer_delete_cancel (tdh);
+}
+
+
+struct TALER_MERCHANT_TransferDeleteHandle *
+TALER_MERCHANT_transfer_delete (
+  struct GNUNET_CURL_Context *ctx,
+  const char *backend_url,
+  uint64_t wire_transfer_serial,
+  TALER_MERCHANT_TransferDeleteCallback cb,
+  void *cb_cls)
+{
+  struct TALER_MERCHANT_TransferDeleteHandle *tdh;
+
+  tdh = GNUNET_new (struct TALER_MERCHANT_TransferDeleteHandle);
+  tdh->ctx = ctx;
+  tdh->cb = cb;
+  tdh->cb_cls = cb_cls;
+  {
+    char *path;
+
+    GNUNET_asprintf (&path,
+                     "private/transfers/%llu",
+                     (unsigned long long) wire_transfer_serial);
+    tdh->url = TALER_url_join (backend_url,
+                               path,
+                               NULL);
+    GNUNET_free (path);
+  }
+  if (NULL == tdh->url)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not construct request URL.\n");
+    GNUNET_free (tdh);
+    return NULL;
+  }
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Requesting URL '%s'\n",
+              tdh->url);
+  {
+    CURL *eh;
+
+    eh = curl_easy_init ();
+    GNUNET_assert (CURLE_OK ==
+                   curl_easy_setopt (eh,
+                                     CURLOPT_URL,
+                                     tdh->url));
+    GNUNET_assert (CURLE_OK ==
+                   curl_easy_setopt (eh,
+                                     CURLOPT_CUSTOMREQUEST,
+                                     MHD_HTTP_METHOD_DELETE));
+    tdh->job = GNUNET_CURL_job_add (ctx,
+                                    eh,
+                                    &handle_delete_transfer_finished,
+                                    tdh);
+  }
+  return tdh;
+}
+
+
+void
+TALER_MERCHANT_transfer_delete_cancel (
+  struct TALER_MERCHANT_TransferDeleteHandle *tdh)
+{
+  if (NULL != tdh->job)
+    GNUNET_CURL_job_cancel (tdh->job);
+  GNUNET_free (tdh->url);
+  GNUNET_free (tdh);
+}