exchange

Base system with REST service to issue digital coins, run by the payment service provider
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taler-auditor-httpd_mhd.c (4322B)

      1 /*
      2   This file is part of TALER
      3   Copyright (C) 2014-2020 Taler Systems SA
      4 
      5   TALER is free software; you can redistribute it and/or modify it under the
      6   terms of the GNU Affero General Public License as published by the Free Software
      7   Foundation; either version 3, or (at your option) any later version.
      8 
      9   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
     10   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
     11   A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
     12 
     13   You should have received a copy of the GNU Affero General Public License along with
     14   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
     15 */
     16 
     17 /**
     18  * @file taler-auditor-httpd_mhd.c
     19  * @brief helpers for MHD interaction; these are TALER_MHD_handler_ functions
     20  *        that generate simple MHD replies that do not require any real operations
     21  *        to be performed (error handling, static pages, etc.)
     22  * @author Florian Dold
     23  * @author Benedikt Mueller
     24  * @author Christian Grothoff
     25  */
     26 #include <gnunet/gnunet_util_lib.h>
     27 #include <jansson.h>
     28 #include <microhttpd.h>
     29 #include <pthread.h>
     30 #include "taler/taler_mhd_lib.h"
     31 #include "taler-auditor-httpd.h"
     32 #include "taler-auditor-httpd_mhd.h"
     33 
     34 
     35 /**
     36  * Check recursively that integers in @a value can be represented exactly by
     37  * JavaScript clients, that is, that their magnitude does not exceed the
     38  * largest SafeUint64.  Negative values occur (such as "profitable" being -1
     39  * for a loss).
     40  *
     41  * @param value JSON value to inspect
     42  * @return true if all integers are safe
     43  */
     44 static bool
     45 json_integers_are_safe (const json_t *value)
     46 {
     47   if (json_is_integer (value))
     48   {
     49     json_int_t number = json_integer_value (value);
     50 
     51     if (number < 0)
     52       return ((uint64_t) (-(number + 1))) < TAH_SAFE_UINT64_MAX;
     53     return ((uint64_t) number <= TAH_SAFE_UINT64_MAX);
     54   }
     55   if (json_is_array (value))
     56   {
     57     size_t index;
     58     json_t *child;
     59 
     60     json_array_foreach ((json_t *) value, index, child)
     61     if (! json_integers_are_safe (child))
     62       return false;
     63   }
     64   if (json_is_object (value))
     65   {
     66     const char *key;
     67     json_t *child;
     68 
     69     json_object_foreach ((json_t *) value, key, child)
     70     if (! json_integers_are_safe (child))
     71       return false;
     72   }
     73   return true;
     74 }
     75 
     76 
     77 enum MHD_Result
     78 TAH_reply_json_records (struct MHD_Connection *connection,
     79                         json_t *records)
     80 {
     81   if (! json_integers_are_safe (records))
     82   {
     83     GNUNET_break (0);
     84     json_decref (records);
     85     return TALER_MHD_reply_with_error (
     86       connection,
     87       MHD_HTTP_INTERNAL_SERVER_ERROR,
     88       TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE,
     89       "monitoring response contains an integer outside SafeUint64");
     90   }
     91   return TALER_MHD_REPLY_JSON_PACK (
     92     connection,
     93     MHD_HTTP_OK,
     94     GNUNET_JSON_pack_array_steal ("records",
     95                                   records));
     96 }
     97 
     98 
     99 enum MHD_Result
    100 TAH_MHD_handler_static_response (struct TAH_RequestHandler *rh,
    101                                  struct MHD_Connection *connection,
    102                                  void **connection_cls,
    103                                  const char *upload_data,
    104                                  size_t *upload_data_size,
    105                                  const char *const args[])
    106 {
    107   size_t dlen;
    108 
    109   (void) connection_cls;
    110   (void) upload_data;
    111   (void) upload_data_size;
    112   dlen = (0 == rh->data_size)
    113          ? strlen ((const char *) rh->data)
    114          : rh->data_size;
    115   return TALER_MHD_reply_static (connection,
    116                                  rh->response_code,
    117                                  rh->mime_type,
    118                                  rh->data,
    119                                  dlen);
    120 }
    121 
    122 
    123 enum MHD_Result
    124 TAH_MHD_handler_agpl_redirect (struct TAH_RequestHandler *rh,
    125                                struct MHD_Connection *connection,
    126                                void **connection_cls,
    127                                const char *upload_data,
    128                                size_t *upload_data_size,
    129                                const char *const args[])
    130 {
    131   (void) rh;
    132   (void) connection_cls;
    133   (void) upload_data;
    134   (void) upload_data_size;
    135   return TALER_MHD_reply_agpl (connection,
    136                                "http://www.git.taler.net/?p=exchange.git");
    137 }
    138 
    139 
    140 /* end of taler-auditor-httpd_mhd.c */