merchant

merchant_api_post_webhooks.c (6997B)

---

 /*
   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 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_post_webhooks.c
  * @brief Implementation of the POST /webhooks request
  *        of the merchant's HTTP API
  * @author Priscilla HUANG
  */
 #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 "taler_merchant_service.h"
 #include "merchant_api_curl_defaults.h"
 #include "merchant_api_common.h"
 #include <taler/taler_json_lib.h>
 #include <taler/taler_curl_lib.h>
 
 
 /**
  * Handle for a POST /webhooks/$ID operation.
  */
 struct TALER_MERCHANT_WebhooksPostHandle
 {
 
   /**
    * The url for this request.
    */
   char *url;
 
   /**
    * Handle for the request.
    */
   struct GNUNET_CURL_Job *job;
 
   /**
    * Function to call with the result.
    */
   TALER_MERCHANT_WebhooksPostCallback cb;
 
   /**
    * Closure for @a cb.
    */
   void *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 
   /**
    * Minor context that holds body and headers.
    */
   struct TALER_CURL_PostContext post_ctx;
 
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP POST /webhooks request.
  *
  * @param cls the `struct TALER_MERCHANT_WebhooksPostHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_post_webhooks_finished (void *cls,
                                long response_code,
                                const void *response)
 {
   struct TALER_MERCHANT_WebhooksPostHandle *wph = cls;
   const json_t *json = response;
   struct TALER_MERCHANT_HttpResponse hr = {
     .http_status = (unsigned int) response_code,
     .reply = json
   };
 
   wph->job = NULL;
   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
               "POST /webhooks completed with response code %u\n",
               (unsigned int) response_code);
   switch (response_code)
   {
   case 0:
     hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     break;
   case MHD_HTTP_NO_CONTENT:
     break;
   case MHD_HTTP_BAD_REQUEST:
     hr.ec = TALER_JSON_get_error_code (json);
     hr.hint = TALER_JSON_get_error_hint (json);
     /* This should never happen, either us
      * or the merchant is buggy (or API version conflict);
      * just pass JSON reply to the application */
     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_FORBIDDEN:
     hr.ec = TALER_JSON_get_error_code (json);
     hr.hint = TALER_JSON_get_error_hint (json);
     /* Nothing really to verify, merchant says we tried to abort the payment
      * after it was successful. We should pass the JSON reply to the
      * application */
     break;
   case MHD_HTTP_NOT_FOUND:
     hr.ec = TALER_JSON_get_error_code (json);
     hr.hint = TALER_JSON_get_error_hint (json);
     /* Nothing really to verify, this should never
        happen, we should pass the JSON reply to the
        application */
     break;
   case MHD_HTTP_CONFLICT:
     hr.ec = TALER_JSON_get_error_code (json);
     hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_INTERNAL_SERVER_ERROR:
     hr.ec = TALER_JSON_get_error_code (json);
     hr.hint = TALER_JSON_get_error_hint (json);
     /* Server had an internal issue; we should retry,
        but this API leaves this to the application */
     break;
   default:
     TALER_MERCHANT_parse_error_details_ (json,
                                          response_code,
                                          &hr);
     /* unexpected response code */
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Unexpected response code %u/%d\n",
                 (unsigned int) response_code,
                 (int) hr.ec);
     GNUNET_break_op (0);
     break;
   }
   wph->cb (wph->cb_cls,
            &hr);
   TALER_MERCHANT_webhooks_post_cancel (wph);
 }
 
 
 struct TALER_MERCHANT_WebhooksPostHandle *
 TALER_MERCHANT_webhooks_post (
   struct GNUNET_CURL_Context *ctx,
   const char *backend_url,
   const char *webhook_id,
   const char *event_type,
   const char *url,
   const char *http_method,
   const char *header_template,
   const char *body_template,
   TALER_MERCHANT_WebhooksPostCallback cb,
   void *cb_cls)
 {
   struct TALER_MERCHANT_WebhooksPostHandle *wph;
   json_t *req_obj;
 
   req_obj = GNUNET_JSON_PACK (
     GNUNET_JSON_pack_string ("webhook_id",
                              webhook_id),
     GNUNET_JSON_pack_string ("event_type",
                              event_type),
     GNUNET_JSON_pack_string ("url",
                              url),
     GNUNET_JSON_pack_string ("http_method",
                              http_method),
     GNUNET_JSON_pack_string ("header_template",
                              header_template),
     GNUNET_JSON_pack_string ("body_template",
                              body_template));
   wph = GNUNET_new (struct TALER_MERCHANT_WebhooksPostHandle);
   wph->ctx = ctx;
   wph->cb = cb;
   wph->cb_cls = cb_cls;
   wph->url = TALER_url_join (backend_url,
                              "private/webhooks",
                              NULL);
   if (NULL == wph->url)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Could not construct request URL.\n");
     json_decref (req_obj);
     GNUNET_free (wph);
     return NULL;
   }
   {
     CURL *eh;
 
     eh = TALER_MERCHANT_curl_easy_get_ (wph->url);
     GNUNET_assert (GNUNET_OK ==
                    TALER_curl_easy_post (&wph->post_ctx,
                                          eh,
                                          req_obj));
     json_decref (req_obj);
     wph->job = GNUNET_CURL_job_add2 (ctx,
                                      eh,
                                      wph->post_ctx.headers,
                                      &handle_post_webhooks_finished,
                                      wph);
     GNUNET_assert (NULL != wph->job);
   }
   return wph;
 }
 
 
 void
 TALER_MERCHANT_webhooks_post_cancel (
   struct TALER_MERCHANT_WebhooksPostHandle *wph)
 {
   if (NULL != wph->job)
   {
     GNUNET_CURL_job_cancel (wph->job);
     wph->job = NULL;
   }
   TALER_curl_easy_post_finished (&wph->post_ctx);
   GNUNET_free (wph->url);
   GNUNET_free (wph);
 }
 
 
 /* end of merchant_api_post_webhooks.c */