donau

donau_api_batch_submit_receipts.c (7350B)

---

 /*
   This file is part of TALER
   Copyright (C) 2024 Taler Systems SA
 
   TALER is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published
   by the Free Software Foundation; either version 3, 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 General Public License for more details.
 
   You should have received a copy of the GNU General Public
   License along with TALER; see the file COPYING.  If not, see
   <http://www.gnu.org/licenses/>
 */
 
 /**
  * @file lib/donau_api_batch_submit_receipts.c
  * @brief Implementation of the "handle" component of the donau's HTTP API
  * @author Lukas Matyja
  */
 #include <gnunet/gnunet_curl_lib.h>
 #include <taler/taler_json_lib.h>
 #include <taler/taler_curl_lib.h>
 #include "donau_service.h"
 #include "donau_util.h"
 #include "donau_api_curl_defaults.h"
 #include "donau_json_lib.h"
 
 
 /**
  * Handle for a POST /batch-submit request.
  */
 struct DONAU_DonorReceiptsToStatementHandle
 {
   /**
    * The url for the /batch-submit request.
    */
   char *url;
 
   /**
    * Minor context that holds body and headers.
    */
   struct TALER_CURL_PostContext post_ctx;
 
   /**
    * Entry for this request with the `struct GNUNET_CURL_Context`.
    */
   struct GNUNET_CURL_Job *job;
 
   /**
    * Function to call with the result.
    */
   DONAU_DonorReceiptsToStatementResultCallback cb;
 
   /**
    * Closure to pass to @e cb.
    */
   void *cb_cls;
 
   /**
    * Reference to the execution context.
    */
   struct GNUNET_CURL_Context *ctx;
 
 };
 
 /**
  * Transform submit receipt request into JSON.
  *
  * @param num_drs number of donation receipts in @drs
  * @param drs donation receipts array
  * @param year corresponding year
  * @param h_tax_id salted and hashed tax id
  */
 static json_t *
 submit_request_body_to_json (
   const size_t num_drs,
   const struct DONAU_DonationReceipt drs[num_drs],
   const uint64_t year,
   const struct DONAU_HashDonorTaxId *h_tax_id)
 {
   json_t *donation_receipts = json_array ();
 
   GNUNET_assert (NULL != donation_receipts);
   for (size_t i = 0; i < num_drs; i++)
   {
     json_t *receipt = GNUNET_JSON_PACK (
       GNUNET_JSON_pack_data_auto ("h_donation_unit_pub",
                                   &drs[i].h_donation_unit_pub),
       GNUNET_JSON_pack_data_auto ("nonce",
                                   &drs[i].nonce),
       DONAU_JSON_pack_donation_unit_sig ("donation_unit_sig",
                                          &drs[i].donation_unit_sig));
 
     GNUNET_assert (0 ==
                    json_array_append_new (donation_receipts,
                                           receipt));
   }
   return GNUNET_JSON_PACK (
     GNUNET_JSON_pack_array_steal ("donation_receipts",
                                   donation_receipts),
     GNUNET_JSON_pack_data_auto ("h_donor_tax_id",
                                 h_tax_id),
     GNUNET_JSON_pack_uint64 ("donation_year",
                              year));
 }
 
 
 /**
  * Function called when we're done processing the
  * HTTP POST /batch-submit request.
  *
  * @param cls the `struct KeysRequest`
  * @param response_code HTTP response code, 0 on error
  * @param resp_obj parsed JSON result, NULL on error
  */
 static void
 handle_batch_submit_finished (void *cls,
                               long response_code,
                               const void *resp_obj)
 {
   struct DONAU_DonorReceiptsToStatementHandle *birh = cls;
   const json_t *j = resp_obj;
   struct DONAU_DonorReceiptsToStatementResult biresp = {
     .hr.reply = j,
     .hr.http_status = (unsigned int) response_code
   };
 
   birh->job = NULL;
   switch (response_code)
   {
   case MHD_HTTP_OK:
     break;
   case MHD_HTTP_NO_CONTENT:
     biresp.hr.ec = TALER_JSON_get_error_code (j);
     biresp.hr.hint = TALER_JSON_get_error_hint (j);
     break;
   // One of the signatures is invalid.
   case MHD_HTTP_FORBIDDEN:
     biresp.hr.ec = TALER_JSON_get_error_code (j);
     biresp.hr.hint = TALER_JSON_get_error_hint (j);
     break;
   // At least one of the donation unit keys is not known to the Donau.
   case MHD_HTTP_NOT_FOUND:
     biresp.hr.ec = TALER_JSON_get_error_code (j);
     biresp.hr.hint = TALER_JSON_get_error_hint (j);
     break;
   // At least one of the corresponding private keys is deprecated/leaked.
   case MHD_HTTP_GONE:
     biresp.hr.ec = TALER_JSON_get_error_code (j);
     biresp.hr.hint = TALER_JSON_get_error_hint (j);
     break;
   case MHD_HTTP_CONTENT_TOO_LARGE:
     biresp.hr.ec = TALER_JSON_get_error_code (j);
     biresp.hr.hint = TALER_JSON_get_error_hint (j);
     break;
   default:
     /* unexpected response code */
     GNUNET_break_op (0);
     biresp.hr.ec = TALER_JSON_get_error_code (j);
     biresp.hr.hint = TALER_JSON_get_error_hint (j);
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Unexpected response code %u/%d for POST %s\n",
                 (unsigned int) response_code,
                 (int) biresp.hr.ec,
                 birh->url);
     break;
   }
   if (NULL != birh->cb)
   {
     birh->cb (birh->cb_cls,
               &biresp);
     birh->cb = NULL;
   }
   DONAU_donor_receipts_to_statement_cancel (birh);
 }
 
 
 struct DONAU_DonorReceiptsToStatementHandle *
 DONAU_donor_receipts_to_statement (
   struct GNUNET_CURL_Context *ctx,
   const char *url,
   const size_t num_drs,
   const struct DONAU_DonationReceipt drs[num_drs],
   const uint64_t year,
   const struct DONAU_HashDonorTaxId *h_tax_id,
   DONAU_DonorReceiptsToStatementResultCallback cb,
   void *cls)
 {
   struct DONAU_DonorReceiptsToStatementHandle *birh;
   CURL *eh;
   json_t *body;
 
   TALER_LOG_DEBUG ("Connecting to the donau (%s)\n",
                    url);
   birh = GNUNET_new (struct DONAU_DonorReceiptsToStatementHandle);
   birh->url = GNUNET_strdup (url);
   birh->cb = cb;
   birh->cb_cls = cls;
   birh->ctx = ctx;
   birh->url = TALER_url_join (url,
                               "batch-submit",
                               NULL);
   if (NULL == birh->url)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Could not construct request URL.\n");
     GNUNET_free (birh);
     return NULL;
   }
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "submit_receipts_with_URL `%s'.\n",
               birh->url);
   body = submit_request_body_to_json (num_drs, drs, year, h_tax_id);
   eh = DONAU_curl_easy_get_ (birh->url);
   if ( (NULL == eh) ||
        (GNUNET_OK !=
         TALER_curl_easy_post (&birh->post_ctx,
                               eh,
                               body)) )
   {
     GNUNET_break (0);
     if (NULL != eh)
       curl_easy_cleanup (eh);
     json_decref (body);
     GNUNET_free (birh->url);
     return NULL;
   }
   json_decref (body);
   birh->job = GNUNET_CURL_job_add2 (ctx,
                                     eh,
                                     birh->post_ctx.headers,
                                     &handle_batch_submit_finished,
                                     birh);
   return birh;
 }
 
 
 void
 DONAU_donor_receipts_to_statement_cancel (
   struct DONAU_DonorReceiptsToStatementHandle *drsh)
 {
   if (NULL != drsh->job)
   {
     GNUNET_CURL_job_cancel (drsh->job);
     drsh->job = NULL;
   }
   TALER_curl_easy_post_finished (&drsh->post_ctx);
   GNUNET_free (drsh->url);
   GNUNET_free (drsh);
 }