[taler-merchant] 177/277: wrote method for delete reserve

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grothoff pushed a commit to branch master
in repository merchant.

commit a48cac99e4a950fbedae536b4dd964a34781ee10
Author: Jonathan Buchanan <jonathan.russ.buchanan@gmail.com>
AuthorDate: Thu Jun 4 12:51:52 2020 -0400

    wrote method for delete reserve
---
 src/lib/Makefile.am                   |   1 +
 src/lib/merchant_api_delete_reserve.c | 262 ++++++++++++++++++++++++++++++++++
 2 files changed, 263 insertions(+)

diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index 8e505b8..50b7a6d 100644
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -17,6 +17,7 @@ libtalermerchant_la_SOURCES = \
   merchant_api_common.c \
   merchant_api_delete_instance.c \
   merchant_api_delete_product.c \
+  merchant_api_delete_reserve.c \
   merchant_api_get_config.c \
   merchant_api_get_instance.c \
   merchant_api_get_instances.c \
diff --git a/src/lib/merchant_api_delete_reserve.c 
b/src/lib/merchant_api_delete_reserve.c
new file mode 100644
index 0000000..e765201
--- /dev/null
+++ b/src/lib/merchant_api_delete_reserve.c
@@ -0,0 +1,262 @@
+/*
+  This file is part of TALER
+  Copyright (C) 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_reserve.c
+ * @brief Implementation of the DELETE /reserves/$RESERVE_PUB request of the 
merchant's HTTP API
+ * @author Jonathan Buchanan
+ */
+ #include "platform.h"
+ #include <curl/curl.h>
+ #include <jansson.h>
+ #include <microhttpd.h> /* just for HTTP status codes */
+ #include <gnunet/gnunet_util_lib.h>
+ #include <gnunet/gnunet_curl_lib.h>
+ #include "taler_merchant_service.h"
+ #include <taler/taler_json_lib.h>
+ #include <taler/taler_signatures.h>
+
+
+/**
+ * Handle for a DELETE /reserves/$RESERVE_PUB operation.
+ */
+struct TALER_MERCHANT_ReserveDeleteHandle
+{
+
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_MERCHANT_ReserveDeleteCallback 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 /reserves/$RESERVE_PUB request.
+ *
+ * @param cls the `struct TALER_MERCHANT_InstanceDeleteHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param json response body, NULL if not in JSON
+ */
+static void
+handle_delete_reserve_finished (void *cls,
+                                long response_code,
+                                const void *response)
+{
+  struct TALER_MERCHANT_ReserveDeleteHandle *rdh = cls;
+  const json_t *json = response;
+  struct TALER_MERCHANT_HttpResponse hr = {
+    .http_status = (unsigned int) response_code,
+    .reply = json
+  };
+
+  rdh->job = NULL;
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Got /reserves/$ID response with status code %u\n",
+              (unsigned int) response_code);
+  switch (response_code)
+  {
+  case MHD_HTTP_NO_CONTENT:
+    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;
+  }
+  rdh->cb (rdh->cb_cls,
+           &hr);
+  TALER_MERCHANT_reserve_delete_cancel (rdh);
+}
+
+
+/**
+ * Delete the private key of a reserve.
+ *
+ * @param ctx the context
+ * @param backend_url HTTP base URL for the backend
+ * @param instance_id which instance should be deleted
+ * @param purge purge instead of just deleting
+ * @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_ReserveDeleteHandle *
+reserve_delete (struct GNUNET_CURL_Context *ctx,
+                const char *backend_url,
+                const struct TALER_ReservePublicKeyP *reserve_pub,
+                bool purge,
+                TALER_MERCHANT_ReserveDeleteCallback cb,
+                void *cb_cls)
+{
+  struct TALER_MERCHANT_ReserveDeleteHandle *rdh;
+
+  rdh = GNUNET_new (struct TALER_MERCHANT_ReserveDeleteHandle);
+  rdh->ctx = ctx;
+  rdh->cb = cb;
+  rdh->cb_cls = cb_cls;
+  {
+    char res_str[sizeof (*reserve_pub) * 2];
+    char arg_str[sizeof (res_str) + 32];
+    char *end;
+
+    end = GNUNET_STRINGS_data_to_string (reserve_pub,
+                                         sizeof (*reserve_pub),
+                                         res_str,
+                                         sizeof (res_str));
+    *end = '\0';
+    GNUNET_snprintf (arg_str,
+                     sizeof (arg_str),
+                     "private/reserves/%s",
+                     res_str);
+    if (purge)
+      rdh->url = TALER_url_join (backend_url,
+                                 arg_str,
+                                 "purge",
+                                 "yes",
+                                 NULL);
+    else
+      rdh->url = TALER_url_join (backend_url,
+                                 arg_str,
+                                 NULL);
+  }
+  if (NULL == rdh->url)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not construct request URL.\n");
+    GNUNET_free (rdh);
+    return NULL;
+  }
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Requesting URL '%s'\n",
+              rdh->url);
+  {
+    CURL *eh;
+
+    eh = curl_easy_init ();
+    GNUNET_assert (CURLE_OK ==
+                   curl_easy_setopt (eh,
+                                     CURLOPT_URL,
+                                     rdh->url));
+    GNUNET_assert (CURLE_OK ==
+                   curl_easy_setopt (eh,
+                                     CURLOPT_CUSTOMREQUEST,
+                                     MHD_HTTP_METHOD_DELETE));
+    rdh->job = GNUNET_CURL_job_add (ctx,
+                                    eh,
+                                    GNUNET_YES,
+                                    &handle_delete_reserve_finished,
+                                    rdh);
+  }
+  return rdh;
+}
+
+
+/**
+ * Issue a DELETE /reserve/$RESERVE_ID request to the backend.  Only
+ * deletes the private key of the reserve, preserves tipping data.
+ *
+ * @param ctx execution context
+ * @param backend_url base URL of the merchant backend
+ * @param reserve_pub which reserve should be queried
+ * @param cb function to call with the result
+ * @param cb_cls closure for @a cb
+ * @return handle for this operation, NULL upon errors
+ */
+struct TALER_MERCHANT_ReserveDeleteHandle *
+TALER_MERCHANT_reserve_delete (
+  struct GNUNET_CURL_Context *ctx,
+  const char *backend_url,
+  const struct TALER_ReservePublicKeyP *reserve_pub,
+  TALER_MERCHANT_ReserveDeleteCallback cb,
+  void *cb_cls)
+{
+  return reserve_delete (ctx,
+                         backend_url,
+                         reserve_pub,
+                         false,
+                         cb,
+                         cb_cls);
+}
+
+
+/**
+ * Issue a DELETE /reserve/$RESERVE_ID request to the backend.
+ * Purges the reserve, deleting all associated data. DANGEROUS.
+ *
+ * @param ctx execution context
+ * @param backend_url base URL of the merchant backend
+ * @param reserve_pub which reserve should be queried
+ * @param cb function to call with the result
+ * @param cb_cls closure for @a cb
+ * @return handle for this operation, NULL upon errors
+ */
+struct TALER_MERCHANT_ReserveDeleteHandle *
+TALER_MERCHANT_reserve_purge (struct GNUNET_CURL_Context *ctx,
+                              const char *backend_url,
+                              const struct TALER_ReservePublicKeyP 
*reserve_pub,
+                              TALER_MERCHANT_ReserveDeleteCallback cb,
+                              void *cb_cls)
+{
+  return reserve_delete (ctx,
+                         backend_url,
+                         reserve_pub,
+                         true,
+                         cb,
+                         cb_cls);
+}
+
+
+/**
+ * Cancel a DELETE (or purge) /reserve/$RESERVE_ID request.
+ *
+ * @param rdh handle to the request to be canceled
+ */
+void
+TALER_MERCHANT_reserve_delete_cancel (
+  struct TALER_MERCHANT_ReserveDeleteHandle *rdh)
+{
+  if (NULL != rdh->job)
+    GNUNET_CURL_job_cancel (rdh->job);
+  GNUNET_free (rdh->url);
+  GNUNET_free (rdh);
+}

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