/*
This file is part of TALER
Copyright (C) 2014-2022 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
TALER; see the file COPYING. If not, see
*/
/**
* @file taler-exchange-httpd_responses.c
* @brief API for generating generic replies of the exchange; these
* functions are called TEH_RESPONSE_reply_ and they generate
* and queue MHD response objects for a given connection.
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include "taler-exchange-httpd_responses.h"
#include "taler_util.h"
#include "taler_json_lib.h"
#include "taler_mhd_lib.h"
#include "taler-exchange-httpd_keys.h"
/**
* Compile the transaction history of a coin into a JSON object.
*
* @param coin_pub public key of the coin
* @param tl transaction history to JSON-ify
* @return json representation of the @a rh, NULL on error
*/
json_t *
TEH_RESPONSE_compile_transaction_history (
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct TALER_EXCHANGEDB_TransactionList *tl)
{
json_t *history;
history = json_array ();
if (NULL == history)
{
GNUNET_break (0); /* out of memory!? */
return NULL;
}
for (const struct TALER_EXCHANGEDB_TransactionList *pos = tl;
NULL != pos;
pos = pos->next)
{
switch (pos->type)
{
case TALER_EXCHANGEDB_TT_DEPOSIT:
{
const struct TALER_EXCHANGEDB_DepositListEntry *deposit =
pos->details.deposit;
struct TALER_MerchantWireHashP h_wire;
TALER_merchant_wire_signature_hash (deposit->receiver_wire_account,
&deposit->wire_salt,
&h_wire);
#if ENABLE_SANITY_CHECKS
/* internal sanity check before we hand out a bogus sig... */
TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_EDDSA]++;
if (GNUNET_OK !=
TALER_wallet_deposit_verify (&deposit->amount_with_fee,
&deposit->deposit_fee,
&h_wire,
&deposit->h_contract_terms,
&deposit->h_age_commitment,
NULL /* h_extensions! */,
&deposit->h_denom_pub,
deposit->timestamp,
&deposit->merchant_pub,
deposit->refund_deadline,
coin_pub,
&deposit->csig))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
#endif
if (0 !=
json_array_append_new (
history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"DEPOSIT"),
TALER_JSON_pack_amount ("amount",
&deposit->amount_with_fee),
TALER_JSON_pack_amount ("deposit_fee",
&deposit->deposit_fee),
GNUNET_JSON_pack_timestamp ("timestamp",
deposit->timestamp),
GNUNET_JSON_pack_allow_null (
GNUNET_JSON_pack_timestamp ("refund_deadline",
deposit->refund_deadline)),
GNUNET_JSON_pack_data_auto ("merchant_pub",
&deposit->merchant_pub),
GNUNET_JSON_pack_data_auto ("h_contract_terms",
&deposit->h_contract_terms),
GNUNET_JSON_pack_data_auto ("h_wire",
&h_wire),
GNUNET_JSON_pack_data_auto ("h_denom_pub",
&deposit->h_denom_pub),
GNUNET_JSON_pack_allow_null (
deposit->no_age_commitment ?
GNUNET_JSON_pack_string (
"h_age_commitment", NULL) :
GNUNET_JSON_pack_data_auto ("h_age_commitment",
&deposit->h_age_commitment)),
GNUNET_JSON_pack_data_auto ("coin_sig",
&deposit->csig))))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
break;
}
case TALER_EXCHANGEDB_TT_MELT:
{
const struct TALER_EXCHANGEDB_MeltListEntry *melt =
pos->details.melt;
const struct TALER_AgeCommitmentHash *phac = NULL;
#if ENABLE_SANITY_CHECKS
TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_EDDSA]++;
if (GNUNET_OK !=
TALER_wallet_melt_verify (&melt->amount_with_fee,
&melt->melt_fee,
&melt->rc,
&melt->h_denom_pub,
&melt->h_age_commitment,
coin_pub,
&melt->coin_sig))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
#endif
/* Age restriction is optional. We communicate a NULL value to
* JSON_PACK below */
if (! melt->no_age_commitment)
phac = &melt->h_age_commitment;
if (0 !=
json_array_append_new (
history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"MELT"),
TALER_JSON_pack_amount ("amount",
&melt->amount_with_fee),
TALER_JSON_pack_amount ("melt_fee",
&melt->melt_fee),
GNUNET_JSON_pack_data_auto ("rc",
&melt->rc),
GNUNET_JSON_pack_data_auto ("h_denom_pub",
&melt->h_denom_pub),
GNUNET_JSON_pack_allow_null (
GNUNET_JSON_pack_data_auto ("h_age_commitment",
phac)),
GNUNET_JSON_pack_data_auto ("coin_sig",
&melt->coin_sig))))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
}
break;
case TALER_EXCHANGEDB_TT_REFUND:
{
const struct TALER_EXCHANGEDB_RefundListEntry *refund =
pos->details.refund;
struct TALER_Amount value;
#if ENABLE_SANITY_CHECKS
TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_EDDSA]++;
if (GNUNET_OK !=
TALER_merchant_refund_verify (coin_pub,
&refund->h_contract_terms,
refund->rtransaction_id,
&refund->refund_amount,
&refund->merchant_pub,
&refund->merchant_sig))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
#endif
if (0 >
TALER_amount_subtract (&value,
&refund->refund_amount,
&refund->refund_fee))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
if (0 !=
json_array_append_new (
history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"REFUND"),
TALER_JSON_pack_amount ("amount",
&value),
TALER_JSON_pack_amount ("refund_fee",
&refund->refund_fee),
GNUNET_JSON_pack_data_auto ("h_contract_terms",
&refund->h_contract_terms),
GNUNET_JSON_pack_data_auto ("merchant_pub",
&refund->merchant_pub),
GNUNET_JSON_pack_uint64 ("rtransaction_id",
refund->rtransaction_id),
GNUNET_JSON_pack_data_auto ("merchant_sig",
&refund->merchant_sig))))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
}
break;
case TALER_EXCHANGEDB_TT_OLD_COIN_RECOUP:
{
struct TALER_EXCHANGEDB_RecoupRefreshListEntry *pr =
pos->details.old_coin_recoup;
struct TALER_ExchangePublicKeyP epub;
struct TALER_ExchangeSignatureP esig;
if (TALER_EC_NONE !=
TALER_exchange_online_confirm_recoup_refresh_sign (
&TEH_keys_exchange_sign_,
pr->timestamp,
&pr->value,
&pr->coin.coin_pub,
&pr->old_coin_pub,
&epub,
&esig))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
/* NOTE: we could also provide coin_pub's coin_sig, denomination key hash and
the denomination key's RSA signature over coin_pub, but as the
wallet should really already have this information (and cannot
check or do anything with it anyway if it doesn't), it seems
strictly unnecessary. */
if (0 !=
json_array_append_new (
history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"OLD-COIN-RECOUP"),
TALER_JSON_pack_amount ("amount",
&pr->value),
GNUNET_JSON_pack_data_auto ("exchange_sig",
&esig),
GNUNET_JSON_pack_data_auto ("exchange_pub",
&epub),
GNUNET_JSON_pack_data_auto ("coin_pub",
&pr->coin.coin_pub),
GNUNET_JSON_pack_timestamp ("timestamp",
pr->timestamp))))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
break;
}
case TALER_EXCHANGEDB_TT_RECOUP:
{
const struct TALER_EXCHANGEDB_RecoupListEntry *recoup =
pos->details.recoup;
struct TALER_ExchangePublicKeyP epub;
struct TALER_ExchangeSignatureP esig;
if (TALER_EC_NONE !=
TALER_exchange_online_confirm_recoup_sign (
&TEH_keys_exchange_sign_,
recoup->timestamp,
&recoup->value,
coin_pub,
&recoup->reserve_pub,
&epub,
&esig))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
if (0 !=
json_array_append_new (
history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"RECOUP"),
TALER_JSON_pack_amount ("amount",
&recoup->value),
GNUNET_JSON_pack_data_auto ("exchange_sig",
&esig),
GNUNET_JSON_pack_data_auto ("exchange_pub",
&epub),
GNUNET_JSON_pack_data_auto ("reserve_pub",
&recoup->reserve_pub),
GNUNET_JSON_pack_data_auto ("h_denom_pub",
&recoup->h_denom_pub),
GNUNET_JSON_pack_data_auto ("coin_sig",
&recoup->coin_sig),
GNUNET_JSON_pack_data_auto ("coin_blind",
&recoup->coin_blind),
GNUNET_JSON_pack_data_auto ("reserve_pub",
&recoup->reserve_pub),
GNUNET_JSON_pack_timestamp ("timestamp",
recoup->timestamp))))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
}
break;
case TALER_EXCHANGEDB_TT_RECOUP_REFRESH:
{
struct TALER_EXCHANGEDB_RecoupRefreshListEntry *pr =
pos->details.recoup_refresh;
struct TALER_ExchangePublicKeyP epub;
struct TALER_ExchangeSignatureP esig;
if (TALER_EC_NONE !=
TALER_exchange_online_confirm_recoup_refresh_sign (
&TEH_keys_exchange_sign_,
pr->timestamp,
&pr->value,
coin_pub,
&pr->old_coin_pub,
&epub,
&esig))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
/* NOTE: we could also provide coin_pub's coin_sig, denomination key
hash and the denomination key's RSA signature over coin_pub, but as
the wallet should really already have this information (and cannot
check or do anything with it anyway if it doesn't), it seems
strictly unnecessary. *///
if (0 !=
json_array_append_new (
history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"RECOUP-REFRESH"),
TALER_JSON_pack_amount ("amount",
&pr->value),
GNUNET_JSON_pack_data_auto ("exchange_sig",
&esig),
GNUNET_JSON_pack_data_auto ("exchange_pub",
&epub),
GNUNET_JSON_pack_data_auto ("old_coin_pub",
&pr->old_coin_pub),
GNUNET_JSON_pack_data_auto ("h_denom_pub",
&pr->coin.denom_pub_hash),
GNUNET_JSON_pack_data_auto ("coin_sig",
&pr->coin_sig),
GNUNET_JSON_pack_data_auto ("coin_blind",
&pr->coin_blind),
GNUNET_JSON_pack_timestamp ("timestamp",
pr->timestamp))))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
break;
}
case TALER_EXCHANGEDB_TT_PURSE_DEPOSIT:
{
struct TALER_EXCHANGEDB_PurseDepositListEntry *pd
= pos->details.purse_deposit;
if (0 !=
json_array_append_new (
history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"PURSE-DEPOSIT"),
TALER_JSON_pack_amount ("amount",
&pd->amount),
GNUNET_JSON_pack_string ("exchange_base_url",
NULL == pd->exchange_base_url
? TEH_base_url
: pd->exchange_base_url),
GNUNET_JSON_pack_data_auto ("purse_pub",
&pd->purse_pub),
GNUNET_JSON_pack_data_auto ("coin_sig",
&pd->coin_sig))))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
break;
}
}
}
return history;
}
MHD_RESULT
TEH_RESPONSE_reply_unknown_denom_pub_hash (
struct MHD_Connection *connection,
const struct TALER_DenominationHashP *dph)
{
struct TALER_ExchangePublicKeyP epub;
struct TALER_ExchangeSignatureP esig;
struct GNUNET_TIME_Timestamp now;
enum TALER_ErrorCode ec;
now = GNUNET_TIME_timestamp_get ();
ec = TALER_exchange_online_denomination_unknown_sign (
&TEH_keys_exchange_sign_,
now,
dph,
&epub,
&esig);
if (TALER_EC_NONE != ec)
{
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
ec,
NULL);
}
return TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_NOT_FOUND,
TALER_JSON_pack_ec (TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN),
GNUNET_JSON_pack_timestamp ("timestamp",
now),
GNUNET_JSON_pack_data_auto ("exchange_pub",
&epub),
GNUNET_JSON_pack_data_auto ("exchange_sig",
&esig),
GNUNET_JSON_pack_data_auto ("h_denom_pub",
dph));
}
MHD_RESULT
TEH_RESPONSE_reply_expired_denom_pub_hash (
struct MHD_Connection *connection,
const struct TALER_DenominationHashP *dph,
enum TALER_ErrorCode ec,
const char *oper)
{
struct TALER_ExchangePublicKeyP epub;
struct TALER_ExchangeSignatureP esig;
enum TALER_ErrorCode ecr;
struct GNUNET_TIME_Timestamp now
= GNUNET_TIME_timestamp_get ();
ecr = TALER_exchange_online_denomination_expired_sign (
&TEH_keys_exchange_sign_,
now,
dph,
oper,
&epub,
&esig);
if (TALER_EC_NONE != ecr)
{
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
ec,
NULL);
}
return TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_GONE,
TALER_JSON_pack_ec (ec),
GNUNET_JSON_pack_string ("oper",
oper),
GNUNET_JSON_pack_timestamp ("timestamp",
now),
GNUNET_JSON_pack_data_auto ("exchange_pub",
&epub),
GNUNET_JSON_pack_data_auto ("exchange_sig",
&esig),
GNUNET_JSON_pack_data_auto ("h_denom_pub",
dph));
}
MHD_RESULT
TEH_RESPONSE_reply_invalid_denom_cipher_for_operation (
struct MHD_Connection *connection,
const struct TALER_DenominationHashP *dph)
{
struct TALER_ExchangePublicKeyP epub;
struct TALER_ExchangeSignatureP esig;
struct GNUNET_TIME_Timestamp now;
enum TALER_ErrorCode ec;
now = GNUNET_TIME_timestamp_get ();
ec = TALER_exchange_online_denomination_unknown_sign (
&TEH_keys_exchange_sign_,
now,
dph,
&epub,
&esig);
if (TALER_EC_NONE != ec)
{
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
ec,
NULL);
}
return TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_NOT_FOUND,
TALER_JSON_pack_ec (
TALER_EC_EXCHANGE_GENERIC_INVALID_DENOMINATION_CIPHER_FOR_OPERATION),
GNUNET_JSON_pack_timestamp ("timestamp",
now),
GNUNET_JSON_pack_data_auto ("exchange_pub",
&epub),
GNUNET_JSON_pack_data_auto ("exchange_sig",
&esig),
GNUNET_JSON_pack_data_auto ("h_denom_pub",
dph));
}
MHD_RESULT
TEH_RESPONSE_reply_coin_insufficient_funds (
struct MHD_Connection *connection,
enum TALER_ErrorCode ec,
const struct TALER_CoinSpendPublicKeyP *coin_pub)
{
struct TALER_EXCHANGEDB_TransactionList *tl;
enum GNUNET_DB_QueryStatus qs;
json_t *history;
// FIXME: maybe start read-committed transaction here?
// => check all callers (that they aborted already!)
qs = TEH_plugin->get_coin_transactions (TEH_plugin->cls,
coin_pub,
GNUNET_NO,
&tl);
if (0 > qs)
{
return TALER_MHD_reply_with_error (
connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_DB_FETCH_FAILED,
NULL);
}
history = TEH_RESPONSE_compile_transaction_history (coin_pub,
tl);
TEH_plugin->free_coin_transaction_list (TEH_plugin->cls,
tl);
if (NULL == history)
{
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_JSON_ALLOCATION_FAILURE,
"Failed to generated proof of insufficient funds");
}
return TALER_MHD_REPLY_JSON_PACK (
connection,
TALER_ErrorCode_get_http_status_safe (ec),
TALER_JSON_pack_ec (ec),
GNUNET_JSON_pack_data_auto ("coin_pub",
coin_pub),
GNUNET_JSON_pack_array_steal ("history",
history));
}
json_t *
TEH_RESPONSE_compile_reserve_history (
const struct TALER_EXCHANGEDB_ReserveHistory *rh)
{
json_t *json_history;
json_history = json_array ();
for (const struct TALER_EXCHANGEDB_ReserveHistory *pos = rh;
NULL != pos;
pos = pos->next)
{
switch (pos->type)
{
case TALER_EXCHANGEDB_RO_BANK_TO_EXCHANGE:
{
const struct TALER_EXCHANGEDB_BankTransfer *bank =
pos->details.bank;
if (0 !=
json_array_append_new (
json_history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"CREDIT"),
GNUNET_JSON_pack_timestamp ("timestamp",
bank->execution_date),
GNUNET_JSON_pack_string ("sender_account_url",
bank->sender_account_details),
GNUNET_JSON_pack_uint64 ("wire_reference",
bank->wire_reference),
TALER_JSON_pack_amount ("amount",
&bank->amount))))
{
GNUNET_break (0);
json_decref (json_history);
return NULL;
}
break;
}
case TALER_EXCHANGEDB_RO_WITHDRAW_COIN:
{
const struct TALER_EXCHANGEDB_CollectableBlindcoin *withdraw
= pos->details.withdraw;
if (0 !=
json_array_append_new (
json_history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"WITHDRAW"),
GNUNET_JSON_pack_data_auto ("reserve_sig",
&withdraw->reserve_sig),
GNUNET_JSON_pack_data_auto ("h_coin_envelope",
&withdraw->h_coin_envelope),
GNUNET_JSON_pack_data_auto ("h_denom_pub",
&withdraw->denom_pub_hash),
TALER_JSON_pack_amount ("withdraw_fee",
&withdraw->withdraw_fee),
TALER_JSON_pack_amount ("amount",
&withdraw->amount_with_fee))))
{
GNUNET_break (0);
json_decref (json_history);
return NULL;
}
}
break;
case TALER_EXCHANGEDB_RO_RECOUP_COIN:
{
const struct TALER_EXCHANGEDB_Recoup *recoup
= pos->details.recoup;
struct TALER_ExchangePublicKeyP pub;
struct TALER_ExchangeSignatureP sig;
if (TALER_EC_NONE !=
TALER_exchange_online_confirm_recoup_sign (
&TEH_keys_exchange_sign_,
recoup->timestamp,
&recoup->value,
&recoup->coin.coin_pub,
&recoup->reserve_pub,
&pub,
&sig))
{
GNUNET_break (0);
json_decref (json_history);
return NULL;
}
if (0 !=
json_array_append_new (
json_history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"RECOUP"),
GNUNET_JSON_pack_data_auto ("exchange_pub",
&pub),
GNUNET_JSON_pack_data_auto ("exchange_sig",
&sig),
GNUNET_JSON_pack_timestamp ("timestamp",
recoup->timestamp),
TALER_JSON_pack_amount ("amount",
&recoup->value),
GNUNET_JSON_pack_data_auto ("coin_pub",
&recoup->coin.coin_pub))))
{
GNUNET_break (0);
json_decref (json_history);
return NULL;
}
}
break;
case TALER_EXCHANGEDB_RO_EXCHANGE_TO_BANK:
{
const struct TALER_EXCHANGEDB_ClosingTransfer *closing =
pos->details.closing;
struct TALER_ExchangePublicKeyP pub;
struct TALER_ExchangeSignatureP sig;
if (TALER_EC_NONE !=
TALER_exchange_online_reserve_closed_sign (
&TEH_keys_exchange_sign_,
closing->execution_date,
&closing->amount,
&closing->closing_fee,
closing->receiver_account_details,
&closing->wtid,
&pos->details.closing->reserve_pub,
&pub,
&sig))
{
GNUNET_break (0);
json_decref (json_history);
return NULL;
}
if (0 !=
json_array_append_new (
json_history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"CLOSING"),
GNUNET_JSON_pack_string ("receiver_account_details",
closing->receiver_account_details),
GNUNET_JSON_pack_data_auto ("wtid",
&closing->wtid),
GNUNET_JSON_pack_data_auto ("exchange_pub",
&pub),
GNUNET_JSON_pack_data_auto ("exchange_sig",
&sig),
GNUNET_JSON_pack_timestamp ("timestamp",
closing->execution_date),
TALER_JSON_pack_amount ("amount",
&closing->amount),
TALER_JSON_pack_amount ("closing_fee",
&closing->closing_fee))))
{
GNUNET_break (0);
json_decref (json_history);
return NULL;
}
}
break;
case TALER_EXCHANGEDB_RO_PURSE_MERGE:
{
const struct TALER_EXCHANGEDB_PurseMerge *merge =
pos->details.merge;
struct TALER_Amount amount;
GNUNET_assert (0 <=
TALER_amount_subtract (&amount,
&merge->amount_with_fee,
&merge->purse_fee));
if (0 !=
json_array_append_new (
json_history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"MERGE"),
GNUNET_JSON_pack_data_auto ("h_contract_terms",
&merge->h_contract_terms),
GNUNET_JSON_pack_data_auto ("merge_pub",
&merge->merge_pub),
GNUNET_JSON_pack_uint64 ("min_age",
merge->min_age),
GNUNET_JSON_pack_uint64 ("flags",
merge->flags),
GNUNET_JSON_pack_data_auto ("purse_pub",
&merge->purse_pub),
GNUNET_JSON_pack_data_auto ("reserve_sig",
&merge->reserve_sig),
GNUNET_JSON_pack_timestamp ("merge_timestamp",
merge->merge_timestamp),
GNUNET_JSON_pack_timestamp ("purse_expiration",
merge->purse_expiration),
TALER_JSON_pack_amount ("amount",
&amount),
TALER_JSON_pack_amount ("purse_fee",
&merge->purse_fee))))
{
GNUNET_break (0);
json_decref (json_history);
return NULL;
}
}
break;
case TALER_EXCHANGEDB_RO_HISTORY_REQUEST:
{
const struct TALER_EXCHANGEDB_HistoryRequest *history =
pos->details.history;
if (0 !=
json_array_append_new (
json_history,
GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("type",
"HISTORY"),
GNUNET_JSON_pack_data_auto ("reserve_sig",
&history->reserve_sig),
GNUNET_JSON_pack_timestamp ("request_timestamp",
history->request_timestamp),
TALER_JSON_pack_amount ("history_fee",
&history->history_fee))))
{
GNUNET_break (0);
json_decref (json_history);
return NULL;
}
}
break;
}
}
return json_history;
}
/**
* Send reserve history information to client with the
* message that we have insufficient funds for the
* requested withdraw operation.
*
* @param connection connection to the client
* @param ebalance expected balance based on our database
* @param withdraw_amount amount that the client requested to withdraw
* @param rh reserve history to return
* @return MHD result code
*/
static MHD_RESULT
reply_withdraw_insufficient_funds (
struct MHD_Connection *connection,
const struct TALER_Amount *ebalance,
const struct TALER_Amount *withdraw_amount,
const struct TALER_EXCHANGEDB_ReserveHistory *rh)
{
json_t *json_history;
json_history = TEH_RESPONSE_compile_reserve_history (rh);
if (NULL == json_history)
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_WITHDRAW_HISTORY_ERROR_INSUFFICIENT_FUNDS,
NULL);
return TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_CONFLICT,
TALER_JSON_pack_ec (TALER_EC_EXCHANGE_WITHDRAW_INSUFFICIENT_FUNDS),
TALER_JSON_pack_amount ("balance",
ebalance),
TALER_JSON_pack_amount ("requested_amount",
withdraw_amount),
GNUNET_JSON_pack_array_steal ("history",
json_history));
}
MHD_RESULT
TEH_RESPONSE_reply_reserve_insufficient_balance (
struct MHD_Connection *connection,
const struct TALER_Amount *balance_required,
const struct TALER_ReservePublicKeyP *reserve_pub)
{
struct TALER_EXCHANGEDB_ReserveHistory *rh = NULL;
struct TALER_Amount balance;
enum GNUNET_DB_QueryStatus qs;
MHD_RESULT mhd_ret;
// FIXME: maybe start read-committed here?
if (GNUNET_OK !=
TEH_plugin->start (TEH_plugin->cls,
"get_reserve_history on insufficient balance"))
{
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_DB_START_FAILED,
NULL);
}
/* The reserve does not have the required amount (actual
* amount + withdraw fee) */
qs = TEH_plugin->get_reserve_history (TEH_plugin->cls,
reserve_pub,
&balance,
&rh);
TEH_plugin->rollback (TEH_plugin->cls);
if ( (qs < 0) ||
(NULL == rh) )
{
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_DB_FETCH_FAILED,
"reserve history");
}
mhd_ret = reply_withdraw_insufficient_funds (
connection,
&balance,
balance_required,
rh);
TEH_plugin->free_reserve_history (TEH_plugin->cls,
rh);
return mhd_ret;
}
/* end of taler-exchange-httpd_responses.c */