merchant

merchant_api_delete_instance.c (7045B)

---

 /*
   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 merchant_api_delete_instance.c
  * @brief Implementation of the DELETE /instance/$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 "merchant_api_curl_defaults.h"
 #include <taler/taler_json_lib.h>
 #include <taler/taler_signatures.h>
 
 
 /**
  * Handle for a DELETE /instances/$ID operation.
  */
 struct TALER_MERCHANT_InstanceDeleteHandle
 {
   /**
    * The url for this request.
    */
   char *url;
 
   /**
    * Handle for the request.
    */
   struct GNUNET_CURL_Job *job;
 
   /**
    * Function to call with the result.
    */
   TALER_MERCHANT_InstanceDeleteCallback 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 /instances/$ID request.
  *
  * @param cls the `struct TALER_MERCHANT_InstanceDeleteHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_delete_instance_finished (void *cls,
                                  long response_code,
                                  const void *response)
 {
   struct TALER_MERCHANT_InstanceDeleteHandle *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/$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:
     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 for DELETE /instance/ID\n",
                 (unsigned int) response_code,
                 (int) hr.ec);
     break;
   }
   idh->cb (idh->cb_cls,
            &hr);
   TALER_MERCHANT_instance_delete_cancel (idh);
 }
 
 
 /**
  * Delete the private key of an instance of a backend, thereby disabling the
  * instance for future requests.  Will preserve the other instance data
  * (i.e. for taxation).
  *
  * @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 cb function to call with the
  *        backend's return
  * @param cb_cls closure for @a config_cb
  * @return the instances handle; NULL upon error
  */
 static struct TALER_MERCHANT_InstanceDeleteHandle *
 instance_delete (struct GNUNET_CURL_Context *ctx,
                  const char *backend_url,
                  const char *instance_id,
                  bool purge,
                  TALER_MERCHANT_InstanceDeleteCallback cb,
                  void *cb_cls)
 {
   struct TALER_MERCHANT_InstanceDeleteHandle *idh;
 
   idh = GNUNET_new (struct TALER_MERCHANT_InstanceDeleteHandle);
   idh->ctx = ctx;
   idh->cb = cb;
   idh->cb_cls = cb_cls;
   if (NULL != instance_id)
   {
     char *path;
 
     GNUNET_asprintf (&path,
                      "management/instances/%s",
                      instance_id);
     idh->url = TALER_url_join (backend_url,
                                path,
                                "purge",
                                (purge) ? "yes" : NULL,
                                NULL);
     GNUNET_free (path);
   }
   else
   {
     /* backend_url is already identifying the instance */
     idh->url = TALER_url_join (backend_url,
                                "private",
                                "purge",
                                (purge) ? "yes" : NULL,
                                NULL);
   }
   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);
   {
     CURL *eh;
 
     eh = TALER_MERCHANT_curl_easy_get_ (idh->url);
     GNUNET_assert (CURLE_OK ==
                    curl_easy_setopt (eh,
                                      CURLOPT_CUSTOMREQUEST,
                                      MHD_HTTP_METHOD_DELETE));
     idh->job = GNUNET_CURL_job_add (ctx,
                                     eh,
                                     &handle_delete_instance_finished,
                                     idh);
   }
   return idh;
 }
 
 
 struct TALER_MERCHANT_InstanceDeleteHandle *
 TALER_MERCHANT_instance_delete (struct GNUNET_CURL_Context *ctx,
                                 const char *backend_url,
                                 const char *instance_id,
                                 TALER_MERCHANT_InstanceDeleteCallback cb,
                                 void *cb_cls)
 {
   return instance_delete (ctx,
                           backend_url,
                           instance_id,
                           false,
                           cb,
                           cb_cls);
 }
 
 
 struct TALER_MERCHANT_InstanceDeleteHandle *
 TALER_MERCHANT_instance_purge (struct GNUNET_CURL_Context *ctx,
                                const char *backend_url,
                                const char *instance_id,
                                TALER_MERCHANT_InstanceDeleteCallback cb,
                                void *cb_cls)
 {
   return instance_delete (ctx,
                           backend_url,
                           instance_id,
                           true,
                           cb,
                           cb_cls);
 }
 
 
 void
 TALER_MERCHANT_instance_delete_cancel (
   struct TALER_MERCHANT_InstanceDeleteHandle *idh)
 {
   if (NULL != idh->job)
     GNUNET_CURL_job_cancel (idh->job);
   GNUNET_free (idh->url);
   GNUNET_free (idh);
 }