merchant

merchant_api_get-private-fountains.c (8555B)

---

 /*
   This file is part of TALER
   Copyright (C) 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 src/lib/merchant_api_get-private-fountains.c
  * @brief Implementation of the GET /private/fountains request
  * @author Bohdan Potuzhnyi
  */
 #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/get-private-fountains.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 GET /private/fountains operation.
  */
 struct TALER_MERCHANT_GetPrivateFountainsHandle
 {
   /**
    * Base URL of the merchant backend.
    */
   char *base_url;
 
   int64_t limit;
 
   uint64_t offset;
 
   /**
    * 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_GetPrivateFountainsCallback cb;
 
   /**
    * Closure for @a cb.
    */
   TALER_MERCHANT_GET_PRIVATE_FOUNTAINS_RESULT_CLOSURE *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 };
 
 
 /**
  * Parse the "fountains" array and invoke the callback.
  *
  * @param gpfh operation handle
  * @param[in,out] gfr response to complete and pass to the callback
  */
 static void
 handle_ok (struct TALER_MERCHANT_GetPrivateFountainsHandle *gpfh,
            struct TALER_MERCHANT_GetPrivateFountainsResponse *gfr)
 {
   const json_t *jfountains;
   struct GNUNET_JSON_Specification spec[] = {
     GNUNET_JSON_spec_array_const ("fountains",
                                   &jfountains),
     GNUNET_JSON_spec_end ()
   };
 
   if (GNUNET_OK !=
       GNUNET_JSON_parse (gfr->hr.reply,
                          spec,
                          NULL,
                          NULL))
   {
     GNUNET_break_op (0);
     gfr->hr.http_status = 0;
     gfr->hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
     gpfh->cb (gpfh->cb_cls,
               gfr);
     return;
   }
   /* Reject responses exceeding the server page cap before allocating. */
   if (json_array_size (jfountains) > 100)
   {
     gfr->hr.http_status = 0;
     gfr->hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
     gpfh->cb (gpfh->cb_cls,
               gfr);
     return;
   }
   {
     unsigned int len = (unsigned int) json_array_size (jfountains);
     struct TALER_MERCHANT_FountainEntry *fountains
       = GNUNET_new_array (GNUNET_NZL (len),
                           struct TALER_MERCHANT_FountainEntry);
     size_t idx;
     json_t *jf;
 
     json_array_foreach ((json_t *) jfountains, idx, jf)
     {
       struct TALER_MERCHANT_FountainEntry *fe = &fountains[idx];
       struct GNUNET_JSON_Specification ispec[] = {
         GNUNET_JSON_spec_uint64 ("fountain_serial",
                                  &fe->fountain_serial),
         GNUNET_JSON_spec_string ("fountain_id",
                                  &fe->fountain_id),
         GNUNET_JSON_spec_string ("description",
                                  &fe->description),
         GNUNET_JSON_spec_end ()
       };
 
       if (GNUNET_OK !=
           GNUNET_JSON_parse (jf,
                              ispec,
                              NULL,
                              NULL))
       {
         GNUNET_break_op (0);
         gfr->hr.http_status = 0;
         gfr->hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
         GNUNET_free (fountains);
         gpfh->cb (gpfh->cb_cls,
                   gfr);
         return;
       }
     }
     gfr->details.ok.fountains = fountains;
     gfr->details.ok.fountains_len = len;
     gpfh->cb (gpfh->cb_cls,
               gfr);
     GNUNET_free (fountains);
   }
 }
 
 
 /**
  * Function called when we're done processing the
  * HTTP GET /private/fountains request.
  *
  * @param cls the `struct TALER_MERCHANT_GetPrivateFountainsHandle`
  * @param response_code HTTP response code, 0 on error
  * @param response response body, NULL if not in JSON
  */
 static void
 handle_get_fountains_finished (void *cls,
                                long response_code,
                                const void *response)
 {
   struct TALER_MERCHANT_GetPrivateFountainsHandle *gpfh = cls;
   const json_t *json = response;
   struct TALER_MERCHANT_GetPrivateFountainsResponse gfr = {
     .hr.http_status = (unsigned int) response_code,
     .hr.reply = json
   };
 
   gpfh->job = NULL;
   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
               "GET /private/fountains completed with response code %u\n",
               (unsigned int) response_code);
   switch (response_code)
   {
   case 0:
     gfr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
     break;
   case MHD_HTTP_OK:
     handle_ok (gpfh,
                &gfr);
     TALER_MERCHANT_get_private_fountains_cancel (gpfh);
     return;
   case MHD_HTTP_UNAUTHORIZED:
   case MHD_HTTP_FORBIDDEN:
   case MHD_HTTP_NOT_FOUND:
   case MHD_HTTP_INTERNAL_SERVER_ERROR:
     gfr.hr.ec = TALER_JSON_get_error_code (json);
     gfr.hr.hint = TALER_JSON_get_error_hint (json);
     break;
   default:
     TALER_MERCHANT_parse_error_details_ (json,
                                          response_code,
                                          &gfr.hr);
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Unexpected response code %u/%d\n",
                 (unsigned int) response_code,
                 (int) gfr.hr.ec);
     GNUNET_break_op (0);
     break;
   }
   gpfh->cb (gpfh->cb_cls,
             &gfr);
   TALER_MERCHANT_get_private_fountains_cancel (gpfh);
 }
 
 
 struct TALER_MERCHANT_GetPrivateFountainsHandle *
 TALER_MERCHANT_get_private_fountains_create (
   struct GNUNET_CURL_Context *ctx,
   const char *url)
 {
   struct TALER_MERCHANT_GetPrivateFountainsHandle *gpfh;
 
   gpfh = GNUNET_new (struct TALER_MERCHANT_GetPrivateFountainsHandle);
   gpfh->ctx = ctx;
   gpfh->limit = 20;
   gpfh->base_url = GNUNET_strdup (url);
   return gpfh;
 }
 
 
 enum TALER_ErrorCode
 TALER_MERCHANT_get_private_fountains_set_pagination (
   struct TALER_MERCHANT_GetPrivateFountainsHandle *gpfh,
   int64_t limit,
   uint64_t offset)
 {
   if ( (offset > INT64_MAX) || (NULL != gpfh->job) )
     return TALER_EC_GENERIC_PARAMETER_MALFORMED;
   gpfh->limit = limit;
   gpfh->offset = offset;
   return TALER_EC_NONE;
 }
 
 
 enum TALER_ErrorCode
 TALER_MERCHANT_get_private_fountains_start (
   struct TALER_MERCHANT_GetPrivateFountainsHandle *gpfh,
   TALER_MERCHANT_GetPrivateFountainsCallback cb,
   TALER_MERCHANT_GET_PRIVATE_FOUNTAINS_RESULT_CLOSURE *cb_cls)
 {
   CURL *eh;
   char limit_s[32];
   char offset_s[32];
 
   gpfh->cb = cb;
   gpfh->cb_cls = cb_cls;
   GNUNET_snprintf (limit_s, sizeof (limit_s), "%lld",
                    (long long) gpfh->limit);
   GNUNET_snprintf (offset_s, sizeof (offset_s), "%llu",
                    (unsigned long long) gpfh->offset);
   gpfh->url = TALER_url_join (gpfh->base_url,
                               "private/fountains",
                               "limit", limit_s,
                               "offset", offset_s,
                               NULL);
   if (NULL == gpfh->url)
     return TALER_EC_GENERIC_CONFIGURATION_INVALID;
   eh = TALER_MERCHANT_curl_easy_get_ (gpfh->url);
   if (NULL == eh)
   {
     GNUNET_break (0);
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   }
   gpfh->job = GNUNET_CURL_job_add (gpfh->ctx,
                                    eh,
                                    &handle_get_fountains_finished,
                                    gpfh);
   if (NULL == gpfh->job)
     return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
   return TALER_EC_NONE;
 }
 
 
 void
 TALER_MERCHANT_get_private_fountains_cancel (
   struct TALER_MERCHANT_GetPrivateFountainsHandle *gpfh)
 {
   if (NULL != gpfh->job)
   {
     GNUNET_CURL_job_cancel (gpfh->job);
     gpfh->job = NULL;
   }
   GNUNET_free (gpfh->url);
   GNUNET_free (gpfh->base_url);
   GNUNET_free (gpfh);
 }
 
 
 /* end of merchant_api_get-private-fountains.c */