implement DELETE /instances/$ID

1 files changed, 260 insertions, 0 deletions

diff --git a/src/lib/merchant_api_delete_instances_ID.c b/src/lib/merchant_api_delete_instances_ID.c
new file mode 100644
index 00000000..46405bb3
--- /dev/null
+++ b/src/lib/merchant_api_delete_instances_ID.c
@@ -0,0 +1,260 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2014-2018, 2020 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 lib/merchant_api_delete_instances_ID.c
+ * @brief Implementation of the GET /instances 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 /instances/$ID operation.
+ */
+struct TALER_MERCHANT_InstancesDeleteHandle
+{
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_MERCHANT_InstancesDeleteCallback cb;
+
+  /**
+   * Closure for @a cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Reference to the execution context.
+   */
+  struct GNUNET_CURL_Context *ctx;
+
+};
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP DELETE /instances/$ID request.
+ *
+ * @param cls the `struct TALER_MERCHANT_InstancesDeleteHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param json response body, NULL if not in JSON
+ */
+static void
+handle_instances_delete_finished (void *cls,
+                                  long response_code,
+                                  const void *response)
+{
+  struct TALER_MERCHANT_InstancesDeleteHandle *idh = cls;
+  const json_t *json = response;
+  struct TALER_MERCHANT_HttpResponse hr = {
+    .http_status = (unsigned int) response_code,
+    .reply = json
+  };
+
+  idh->job = NULL;
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Got /instances response with status code %u\n",
+              (unsigned int) response_code);
+  switch (response_code)
+  {
+  case MHD_HTTP_OK:
+    break;
+  case MHD_HTTP_NOT_FOUND:
+    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;
+  }
+  idh->cb (idh->cb_cls,
+           &hr);
+  TALER_MERCHANT_instances_delete_cancel (idh);
+}
+
+
+/**
+ * Purge all data associated with an instance. Use with
+ * extreme caution.
+ *
+ * @param ctx the context
+ * @param backend_url HTTP base URL for the backend
+ * @param instance_id which instance should be deleted
+ * @param instances_cb function to call with the
+ *        backend's return
+ * @param instances_cb_cls closure for @a config_cb
+ * @return the instances handle; NULL upon error
+ */
+static struct TALER_MERCHANT_InstancesDeleteHandle *
+instances_delete (
+  struct GNUNET_CURL_Context *ctx,
+  const char *backend_url,
+  const char *instance_id,
+  bool purge,
+  TALER_MERCHANT_InstancesDeleteCallback instances_cb,
+  void *instances_cb_cls)
+{
+  struct TALER_MERCHANT_InstancesDeleteHandle *idh;
+  CURL *eh;
+
+  idh = GNUNET_new (struct TALER_MERCHANT_InstancesDeleteHandle);
+  idh->ctx = ctx;
+  idh->cb = instances_cb;
+  idh->cb_cls = instances_cb_cls;
+  {
+    char *path;
+
+    GNUNET_asprintf (&path,
+                     "instances/%s",
+                     instance_id);
+    if (purge)
+      idh->url = TALER_url_join (backend_url,
+                                 path,
+                                 "purge",
+                                 "true",
+                                 NULL);
+    else
+      idh->url = TALER_url_join (backend_url,
+                                 path,
+                                 NULL);
+    GNUNET_free (path);
+  }
+  if (NULL == idh->url)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not construct request URL.\n");
+    GNUNET_free (idh);
+    return NULL;
+  }
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Requesting URL '%s'\n",
+              idh->url);
+  eh = curl_easy_init ();
+  GNUNET_assert (CURLE_OK ==
+                 curl_easy_setopt (eh,
+                                   CURLOPT_URL,
+                                   idh->url));
+  GNUNET_assert (CURLE_OK ==
+                 curl_easy_setopt (eh,
+                                   CURLOPT_CUSTOMREQUEST,
+                                   MHD_HTTP_METHOD_DELETE));
+  idh->job = GNUNET_CURL_job_add (ctx,
+                                  eh,
+                                  GNUNET_YES,
+                                  &handle_instances_delete_finished,
+                                  idh);
+  return idh;
+}
+
+
+/**
+ * Purge all data associated with an instance. Use with
+ * extreme caution.
+ *
+ * @param ctx the context
+ * @param backend_url HTTP base URL for the backend
+ * @param instance_id which instance should be deleted
+ * @param instances_cb function to call with the
+ *        backend's return
+ * @param instances_cb_cls closure for @a config_cb
+ * @return the instances handle; NULL upon error
+ */
+struct TALER_MERCHANT_InstancesDeleteHandle *
+TALER_MERCHANT_instances_delete_instance (
+  struct GNUNET_CURL_Context *ctx,
+  const char *backend_url,
+  const char *instance_id,
+  TALER_MERCHANT_InstancesDeleteCallback instances_cb,
+  void *instances_cb_cls)
+{
+  return instances_delete (ctx,
+                           backend_url,
+                           instance_id,
+                           false,
+                           instances_cb,
+                           instances_cb_cls);
+}
+
+
+/**
+ * Purge all data associated with an instance. Use with
+ * extreme caution.
+ *
+ * @param ctx the context
+ * @param backend_url HTTP base URL for the backend
+ * @param instance_id which instance should be deleted
+ * @param instances_cb function to call with the
+ *        backend's return
+ * @param instances_cb_cls closure for @a config_cb
+ * @return the instances handle; NULL upon error
+ */
+struct TALER_MERCHANT_InstancesDeleteHandle *
+TALER_MERCHANT_instances_purge_instance (
+  struct GNUNET_CURL_Context *ctx,
+  const char *backend_url,
+  const char *instance_id,
+  TALER_MERCHANT_InstancesDeleteCallback instances_cb,
+  void *instances_cb_cls)
+{
+  return instances_delete (ctx,
+                           backend_url,
+                           instance_id,
+                           true,
+                           instances_cb,
+                           instances_cb_cls);
+}
+
+
+/**
+ * Cancel /instances DELETE request.  Must not be called by clients after the
+ * callback was invoked.
+ *
+ * @param idh request to cancel.
+ */
+void
+TALER_MERCHANT_instances_delete_cancel (
+  struct TALER_MERCHANT_InstancesDeleteHandle *idh)
+{
+  if (NULL != idh->job)
+    GNUNET_CURL_job_cancel (idh->job);
+  GNUNET_free (idh->url);
+  GNUNET_free (idh);
+}