merchant

merchant_api_get-private-templates.c (7396B)

---

 /*
   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_get-private-templates-new.c
  * @brief Implementation of the GET /private/templates 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/get-private-templates.h>
 #include "merchant_api_curl_defaults.h"
 #include <taler/taler_json_lib.h>
 
 
 /**
  * Maximum number of templates we return.
  */
 #define MAX_TEMPLATES 1024
 
 
 /**
  * Handle for a GET /private/templates operation.
  */
 struct TALER_MERCHANT_GetPrivateTemplatesHandle
 {
   /**
    * 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_GetPrivateTemplatesCallback cb;
 
   /**
    * Closure for @a cb.
    */
   TALER_MERCHANT_GET_PRIVATE_TEMPLATES_RESULT_CLOSURE *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 };
 
 
 /**
  * Parse template information from @a ia.
  *
  * @param ia JSON array (or NULL!) with template data
  * @param[in] tgr partially filled response
  * @param gpth operation handle
  * @return #GNUNET_OK on success
  */
 static enum GNUNET_GenericReturnValue
 parse_templates (const json_t *ia,
                  struct TALER_MERCHANT_GetPrivateTemplatesResponse *tgr,
                  struct TALER_MERCHANT_GetPrivateTemplatesHandle *gpth)
 {
   unsigned int tmpl_len = (unsigned int) json_array_size (ia);
 
   if ( (json_array_size (ia) != (size_t) tmpl_len) ||
        (tmpl_len > MAX_TEMPLATES) )
   {
     GNUNET_break (0);
     return GNUNET_SYSERR;
   }
   {
     struct TALER_MERCHANT_GetPrivateTemplatesTemplateEntry tmpl[
       GNUNET_NZL (tmpl_len)];
     size_t index;
     json_t *value;
 
     json_array_foreach (ia, index, value) {
       struct TALER_MERCHANT_GetPrivateTemplatesTemplateEntry *ie =
         &tmpl[index];
       struct GNUNET_JSON_Specification spec[] = {
         GNUNET_JSON_spec_string ("template_id",
                                  &ie->template_id),
         GNUNET_JSON_spec_string ("template_description",
                                  &ie->template_description),
         GNUNET_JSON_spec_end ()
       };
 
       if (GNUNET_OK !=
           GNUNET_JSON_parse (value,
                              spec,
                              NULL, NULL))
       {
         GNUNET_break_op (0);
         return GNUNET_SYSERR;
       }
     }
     tgr->details.ok.templates_length = tmpl_len;
     tgr->details.ok.templates = tmpl;
     gpth->cb (gpth->cb_cls,
               tgr);
     gpth->cb = NULL;
   }
   return GNUNET_OK;
 }
 
 
 /**
  * Function called when we're done processing the
  * HTTP GET /private/templates request.
  *
  * @param cls the `struct TALER_MERCHANT_GetPrivateTemplatesHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_get_templates_finished (void *cls,
                                long response_code,
                                const void *response)
 {
   struct TALER_MERCHANT_GetPrivateTemplatesHandle *gpth = cls;
   const json_t *json = response;
   struct TALER_MERCHANT_GetPrivateTemplatesResponse tgr = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   gpth->job = NULL;
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Got /private/templates response with status code %u\n",
               (unsigned int) response_code);
   switch (response_code)
   {
   case MHD_HTTP_OK:
     {
       const json_t *templates;
       struct GNUNET_JSON_Specification spec[] = {
         GNUNET_JSON_spec_array_const ("templates",
                                       &templates),
         GNUNET_JSON_spec_end ()
       };
 
       if (GNUNET_OK !=
           GNUNET_JSON_parse (json,
                              spec,
                              NULL, NULL))
       {
         tgr.hr.http_status = 0;
         tgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
         break;
       }
       if (GNUNET_OK ==
           parse_templates (templates,
                            &tgr,
                            gpth))
       {
         TALER_MERCHANT_get_private_templates_cancel (gpth);
         return;
       }
       tgr.hr.http_status = 0;
       tgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
       break;
     }
   case MHD_HTTP_UNAUTHORIZED:
     tgr.hr.ec = TALER_JSON_get_error_code (json);
     tgr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   default:
     tgr.hr.ec = TALER_JSON_get_error_code (json);
     tgr.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) tgr.hr.ec);
     break;
   }
   gpth->cb (gpth->cb_cls,
             &tgr);
   TALER_MERCHANT_get_private_templates_cancel (gpth);
 }
 
 
 struct TALER_MERCHANT_GetPrivateTemplatesHandle *
 TALER_MERCHANT_get_private_templates_create (
   struct GNUNET_CURL_Context *ctx,
   const char *url)
 {
   struct TALER_MERCHANT_GetPrivateTemplatesHandle *gpth;
 
   gpth = GNUNET_new (struct TALER_MERCHANT_GetPrivateTemplatesHandle);
   gpth->ctx = ctx;
   gpth->base_url = GNUNET_strdup (url);
   return gpth;
 }
 
 
 enum TALER_ErrorCode
 TALER_MERCHANT_get_private_templates_start (
   struct TALER_MERCHANT_GetPrivateTemplatesHandle *gpth,
   TALER_MERCHANT_GetPrivateTemplatesCallback cb,
   TALER_MERCHANT_GET_PRIVATE_TEMPLATES_RESULT_CLOSURE *cb_cls)
 {
   CURL *eh;
 
   gpth->cb = cb;
   gpth->cb_cls = cb_cls;
   gpth->url = TALER_url_join (gpth->base_url,
                               "private/templates",
                               NULL);
   if (NULL == gpth->url)
     return TALER_EC_GENERIC_CONFIGURATION_INVALID;
   eh = TALER_MERCHANT_curl_easy_get_ (gpth->url);
   if (NULL == eh)
     return TALER_EC_GENERIC_CONFIGURATION_INVALID;
   gpth->job = GNUNET_CURL_job_add (gpth->ctx,
                                    eh,
                                    &handle_get_templates_finished,
                                    gpth);
   if (NULL == gpth->job)
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   return TALER_EC_NONE;
 }
 
 
 void
 TALER_MERCHANT_get_private_templates_cancel (
   struct TALER_MERCHANT_GetPrivateTemplatesHandle *gpth)
 {
   if (NULL != gpth->job)
   {
     GNUNET_CURL_job_cancel (gpth->job);
     gpth->job = NULL;
   }
   GNUNET_free (gpth->url);
   GNUNET_free (gpth->base_url);
   GNUNET_free (gpth);
 }
 
 
 /* end of merchant_api_get-private-templates-new.c */