merchant

merchant_api_post-private-webhooks.c (8771B)

---

 /*
   This file is part of TALER
   Copyright (C) 2022-2026 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-private-webhooks-new.c
  * @brief Implementation of the POST /private/webhooks request
  * @author Christian Grothoff
  */
 #include "taler/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/taler-merchant/post-private-webhooks.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 /private/webhooks operation.
  */
 struct TALER_MERCHANT_PostPrivateWebhooksHandle
 {
   /**
    * Base URL of the merchant backend.
    */
   char *base_url;
 
   /**
    * The full URL for this request.
    */
   char *url;
 
   /**
    * Handle for the request.
    */
   struct GNUNET_CURL_Job *job;
 
   /**
    * Function to call with the result.
    */
   TALER_MERCHANT_PostPrivateWebhooksCallback cb;
 
   /**
    * Closure for @a cb.
    */
   TALER_MERCHANT_POST_PRIVATE_WEBHOOKS_RESULT_CLOSURE *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;
 
   /**
    * Webhook identifier.
    */
   char *webhook_id;
 
   /**
    * Event type that triggers this webhook.
    */
   char *event_type;
 
   /**
    * URL to send notifications to.
    */
   char *notification_url;
 
   /**
    * HTTP method to use for notifications.
    */
   char *http_method;
 
   /**
    * Optional template for HTTP request headers.
    */
   const char *header_template;
 
   /**
    * Optional template for the HTTP request body.
    */
   const char *body_template;
 };
 
 
 /**
  * Function called when we're done processing the
  * HTTP POST /private/webhooks request.
  *
  * @param cls the `struct TALER_MERCHANT_PostPrivateWebhooksHandle`
  * @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_PostPrivateWebhooksHandle *ppwh = cls;
   const json_t *json = response;
   struct TALER_MERCHANT_PostPrivateWebhooksResponse wpr = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   ppwh->job = NULL;
   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
               "POST /private/webhooks completed with response code %u\n",
               (unsigned int) response_code);
   switch (response_code)
   {
   case 0:
     wpr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     break;
   case MHD_HTTP_NO_CONTENT:
     break;
   case MHD_HTTP_BAD_REQUEST:
     wpr.hr.ec = TALER_JSON_get_error_code (json);
     wpr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_UNAUTHORIZED:
     wpr.hr.ec = TALER_JSON_get_error_code (json);
     wpr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_FORBIDDEN:
     wpr.hr.ec = TALER_JSON_get_error_code (json);
     wpr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_NOT_FOUND:
     wpr.hr.ec = TALER_JSON_get_error_code (json);
     wpr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_CONFLICT:
     wpr.hr.ec = TALER_JSON_get_error_code (json);
     wpr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   case MHD_HTTP_INTERNAL_SERVER_ERROR:
     wpr.hr.ec = TALER_JSON_get_error_code (json);
     wpr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   default:
     TALER_MERCHANT_parse_error_details_ (json,
                                          response_code,
                                          &wpr.hr);
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Unexpected response code %u/%d\n",
                 (unsigned int) response_code,
                 (int) wpr.hr.ec);
     GNUNET_break_op (0);
     break;
   }
   ppwh->cb (ppwh->cb_cls,
             &wpr);
   TALER_MERCHANT_post_private_webhooks_cancel (ppwh);
 }
 
 
 struct TALER_MERCHANT_PostPrivateWebhooksHandle *
 TALER_MERCHANT_post_private_webhooks_create (
   struct GNUNET_CURL_Context *ctx,
   const char *url,
   const char *webhook_id,
   const char *event_type,
   const char *notification_url,
   const char *http_method)
 {
   struct TALER_MERCHANT_PostPrivateWebhooksHandle *ppwh;
 
   ppwh = GNUNET_new (struct TALER_MERCHANT_PostPrivateWebhooksHandle);
   ppwh->ctx = ctx;
   ppwh->base_url = GNUNET_strdup (url);
   ppwh->webhook_id = GNUNET_strdup (webhook_id);
   ppwh->event_type = GNUNET_strdup (event_type);
   ppwh->notification_url = GNUNET_strdup (notification_url);
   ppwh->http_method = GNUNET_strdup (http_method);
   return ppwh;
 }
 
 
 enum GNUNET_GenericReturnValue
 TALER_MERCHANT_post_private_webhooks_set_options_ (
   struct TALER_MERCHANT_PostPrivateWebhooksHandle *ppwh,
   unsigned int num_options,
   const struct TALER_MERCHANT_PostPrivateWebhooksOptionValue *options)
 {
   for (unsigned int i = 0; i < num_options; i++)
   {
     switch (options[i].option)
     {
     case TALER_MERCHANT_POST_PRIVATE_WEBHOOKS_OPTION_END:
       return GNUNET_OK;
     case TALER_MERCHANT_POST_PRIVATE_WEBHOOKS_OPTION_HEADER_TEMPLATE:
       ppwh->header_template = options[i].details.header_template;
       break;
     case TALER_MERCHANT_POST_PRIVATE_WEBHOOKS_OPTION_BODY_TEMPLATE:
       ppwh->body_template = options[i].details.body_template;
       break;
     default:
       GNUNET_break (0);
       return GNUNET_SYSERR;
     }
   }
   return GNUNET_OK;
 }
 
 
 enum TALER_ErrorCode
 TALER_MERCHANT_post_private_webhooks_start (
   struct TALER_MERCHANT_PostPrivateWebhooksHandle *ppwh,
   TALER_MERCHANT_PostPrivateWebhooksCallback cb,
   TALER_MERCHANT_POST_PRIVATE_WEBHOOKS_RESULT_CLOSURE *cb_cls)
 {
   json_t *req_obj;
   CURL *eh;
 
   ppwh->cb = cb;
   ppwh->cb_cls = cb_cls;
   ppwh->url = TALER_url_join (ppwh->base_url,
                               "private/webhooks",
                               NULL);
   if (NULL == ppwh->url)
     return TALER_EC_GENERIC_CONFIGURATION_INVALID;
   req_obj = GNUNET_JSON_PACK (
     GNUNET_JSON_pack_string ("webhook_id",
                              ppwh->webhook_id),
     GNUNET_JSON_pack_string ("event_type",
                              ppwh->event_type),
     GNUNET_JSON_pack_string ("url",
                              ppwh->notification_url),
     GNUNET_JSON_pack_string ("http_method",
                              ppwh->http_method),
     GNUNET_JSON_pack_allow_null (
       GNUNET_JSON_pack_string ("header_template",
                                ppwh->header_template)),
     GNUNET_JSON_pack_allow_null (
       GNUNET_JSON_pack_string ("body_template",
                                ppwh->body_template)));
   eh = TALER_MERCHANT_curl_easy_get_ (ppwh->url);
   if ( (NULL == eh) ||
        (GNUNET_OK !=
         TALER_curl_easy_post (&ppwh->post_ctx,
                               eh,
                               req_obj)) )
   {
     GNUNET_break (0);
     json_decref (req_obj);
     if (NULL != eh)
       curl_easy_cleanup (eh);
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   json_decref (req_obj);
   ppwh->job = GNUNET_CURL_job_add2 (ppwh->ctx,
                                     eh,
                                     ppwh->post_ctx.headers,
                                     &handle_post_webhooks_finished,
                                     ppwh);
   if (NULL == ppwh->job)
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   return TALER_EC_NONE;
 }
 
 
 void
 TALER_MERCHANT_post_private_webhooks_cancel (
   struct TALER_MERCHANT_PostPrivateWebhooksHandle *ppwh)
 {
   if (NULL != ppwh->job)
   {
     GNUNET_CURL_job_cancel (ppwh->job);
     ppwh->job = NULL;
   }
   TALER_curl_easy_post_finished (&ppwh->post_ctx);
   GNUNET_free (ppwh->webhook_id);
   GNUNET_free (ppwh->event_type);
   GNUNET_free (ppwh->notification_url);
   GNUNET_free (ppwh->http_method);
   GNUNET_free (ppwh->url);
   GNUNET_free (ppwh->base_url);
   GNUNET_free (ppwh);
 }
 
 
 /* end of merchant_api_post-private-webhooks-new.c */