-wip on p2p payments
This commit is contained in:
Christian Grothoff
parent
2299b8b193
commit
00928aba0a
502
src/exchange/taler-exchange-httpd_reserves_purse.c
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502
src/exchange/taler-exchange-httpd_reserves_purse.c
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/*
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This file is part of TALER
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Copyright (C) 2022 Taler Systems SA
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU Affero General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file taler-exchange-httpd_reserves_purse.c
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* @brief Handle /reserves/$RID/purse requests; parses the POST and JSON and
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* verifies the coin signature before handing things off
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* to the database.
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <gnunet/gnunet_util_lib.h>
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#include <gnunet/gnunet_json_lib.h>
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#include <jansson.h>
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#include <microhttpd.h>
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#include <pthread.h>
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#include "taler_json_lib.h"
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#include "taler_mhd_lib.h"
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#include "taler-exchange-httpd_reserves_purse.h"
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#include "taler-exchange-httpd_responses.h"
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#include "taler_exchangedb_lib.h"
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#include "taler-exchange-httpd_keys.h"
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/**
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* Closure for #purse_transaction.
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*/
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struct ReservePurseContext
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{
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/**
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* Public key of the reserve we are creating a purse for.
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*/
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const struct TALER_ReservePublicKeyP *reserve_pub;
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/**
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* Public key of the purse we are creating.
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*/
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struct TALER_PurseContractPublicKeyP purse_pub;
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/**
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* Total amount to be put into the purse.
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*/
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struct TALER_Amount amount;
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/**
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* When should the purse expire.
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*/
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struct GNUNET_TIME_Timestamp purse_expiration;
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/**
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* Our current time.
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*/
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struct GNUNET_TIME_Timestamp exchange_timestamp;
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/**
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* Merge key for the purse.
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*/
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struct TALER_PurseMergePublicKeyP merge_pub;
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/**
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* Contract decryption key for the purse.
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*/
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struct TALER_ContractDiffiePublicP contract_pub;
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/**
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* Signature of the client affiming this request.
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*/
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struct TALER_PurseContractSignatureP purse_sig;
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/**
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* Signature of the client affiming this encrypted contract.
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*/
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struct TALER_PurseContractSignatureP econtract_sig;
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/**
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* Hash of the contract terms of the purse.
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*/
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struct TALER_PrivateContractHashP h_contract_terms;
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/**
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* Encrypted contract, can be NULL.
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*/
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void *econtract;
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/**
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* Number of bytes in @e econtract.
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*/
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size_t econtract_size;
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/**
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* Minimum age for deposits into this purse.
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*/
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uint32_t min_age;
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};
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/**
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* Send confirmation of purse creation success to client.
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*
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* @param connection connection to the client
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* @param rpc details about the request that succeeded
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* @return MHD result code
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*/
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static MHD_RESULT
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reply_purse_success (struct MHD_Connection *connection,
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const struct ReservePurseContext *rpc)
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{
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struct TALER_ExchangePublicKeyP pub;
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struct TALER_ExchangeSignatureP sig;
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enum TALER_ErrorCode ec;
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if (TALER_EC_NONE !=
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(ec = TALER_exchange_online_purse_pursed_sign (
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&TEH_keys_exchange_sign_,
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rpc->exchange_timestamp,
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rpc->purse_expiration,
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&rpc->amount,
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&rpc->deposit_total,
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rpc->purse_pub,
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&rpc->merge_pub,
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&rpc->h_contract_terms,
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&pub,
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&sig)))
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{
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GNUNET_break (0);
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return TALER_MHD_reply_with_ec (connection,
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ec,
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NULL);
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}
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return TALER_MHD_REPLY_JSON_PACK (
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connection,
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MHD_HTTP_OK,
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TALER_JSON_pack_amount ("total_deposited",
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&rpc->deposit_total),
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GNUNET_JSON_pack_timestamp ("exchange_timestamp",
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rpc->exchange_timestamp),
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GNUNET_JSON_pack_data_auto ("exchange_sig",
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&sig),
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GNUNET_JSON_pack_data_auto ("exchange_pub",
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&pub));
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}
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/**
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* Execute database transaction for /reserves/$PID/purse. Runs the transaction
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* logic; IF it returns a non-error code, the transaction logic MUST NOT queue
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* a MHD response. IF it returns an hard error, the transaction logic MUST
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* queue a MHD response and set @a mhd_ret. IF it returns the soft error
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* code, the function MAY be called again to retry and MUST not queue a MHD
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* response.
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*
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* @param cls a `struct ReservePurseContext`
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* @param connection MHD request context
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* @param[out] mhd_ret set to MHD status on error
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* @return transaction status
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*/
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static enum GNUNET_DB_QueryStatus
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purse_transaction (void *cls,
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struct MHD_Connection *connection,
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MHD_RESULT *mhd_ret)
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{
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struct ReservePurseContext *rpc = cls;
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enum GNUNET_DB_QueryStatus qs;
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bool in_conflict = true;
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/* 1) store purse */
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qs = TEH_plugin->insert_purse_request (TEH_plugin->cls,
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&rpc->purse_pub,
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&rpc->merge_pub,
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rpc->purse_expiration,
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&rpc->h_contract_terms,
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rpc->min_age,
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&rpc->amount,
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&rpc->purse_sig,
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&in_conflict);
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if (qs < 0)
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{
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if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
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return qs;
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TALER_LOG_WARNING (
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"Failed to store purse purse information in database\n");
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*mhd_ret =
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TALER_MHD_reply_with_error (connection,
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MHD_HTTP_INTERNAL_SERVER_ERROR,
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TALER_EC_GENERIC_DB_STORE_FAILED,
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"insert purse request");
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return qs;
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}
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if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
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return qs;
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if (in_conflict)
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{
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struct TALER_PurseMergePublicKeyP merge_pub;
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struct GNUNET_TIME_Timestamp purse_expiration;
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struct TALER_PrivateContractHashP h_contract_terms;
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struct TALER_Amount target_amount;
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struct TALER_Amount balance;
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struct TALER_PurseContractSignatureP purse_sig;
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uint32_t min_age;
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TEH_plugin->rollback (TEH_plugin->cls);
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qs = TEH_plugin->select_purse_request (TEH_plugin->cls,
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rpc->purse_pub,
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&merge_pub,
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&purse_expiration,
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&h_contract_terms,
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&min_age,
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&target_amount,
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&balance,
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&purse_sig);
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if (qs < 0)
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{
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GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
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TALER_LOG_WARNING ("Failed to fetch purse information from database\n");
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*mhd_ret = TALER_MHD_reply_with_error (connection,
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MHD_HTTP_INTERNAL_SERVER_ERROR,
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TALER_EC_GENERIC_DB_FETCH_FAILED,
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"select purse request");
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return GNUNET_DB_STATUS_HARD_ERROR;
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}
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*mhd_ret
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= TALER_MHD_REPLY_JSON_PACK (
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connection,
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MHD_HTTP_CONFLICT,
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TALER_JSON_pack_ec (
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TALER_EC_EXCHANGE_PURSE_PURSE_CONFLICTING_META_DATA),
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TALER_JSON_pack_amount ("amount",
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&target_amount),
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GNUNET_JSON_pack_uint64 ("min_age",
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min_age),
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GNUNET_JSON_pack_timestamp ("purse_expiration",
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purse_expiration),
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GNUNET_JSON_pack_data_auto ("purse_sig",
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&purse_sig),
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GNUNET_JSON_pack_data_auto ("h_contract_terms",
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&h_contract_terms),
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GNUNET_JSON_pack_data_auto ("merge_pub",
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&merge_pub));
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return GNUNET_DB_STATUS_HARD_ERROR;
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}
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/* 2) merge purse with reserve (and debit reserve) */
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/* 3) if present, persist contract */
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in_conflict = true;
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qs = TEH_plugin->insert_contract (TEH_plugin->cls,
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rpc->purse_pub,
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&rpc->contract_pub,
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rpc->econtract_size,
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rpc->econtract,
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&rpc->econtract_sig,
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&in_conflict);
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if (qs < 0)
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{
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if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
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return qs;
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TALER_LOG_WARNING ("Failed to store purse information in database\n");
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*mhd_ret = TALER_MHD_reply_with_error (connection,
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MHD_HTTP_INTERNAL_SERVER_ERROR,
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TALER_EC_GENERIC_DB_STORE_FAILED,
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"purse purse contract");
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return qs;
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}
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if (in_conflict)
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{
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struct TALER_ContractDiffiePublicP pub_ckey;
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struct TALER_PurseContractSignatureP econtract_sig;
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size_t econtract_size;
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void *econtract;
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struct GNUNET_HashCode h_econtract;
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qs = TEH_plugin->select_contract_by_purse (TEH_plugin->cls,
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rpc->purse_pub,
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&pub_ckey,
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&econtract_sig,
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&econtract_size,
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&econtract);
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if (qs <= 0)
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{
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if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
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return qs;
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TALER_LOG_WARNING (
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"Failed to store fetch contract information from database\n");
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*mhd_ret = TALER_MHD_reply_with_error (connection,
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MHD_HTTP_INTERNAL_SERVER_ERROR,
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TALER_EC_GENERIC_DB_FETCH_FAILED,
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"select contract");
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return qs;
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}
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GNUNET_CRYPTO_hash (econtract,
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econtract_size,
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&h_econtract);
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*mhd_ret
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= TALER_MHD_REPLY_JSON_PACK (
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connection,
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MHD_HTTP_CONFLICT,
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TALER_JSON_pack_ec (
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TALER_EC_EXCHANGE_PURSE_ECONTRACT_CONFLICTING_META_DATA),
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GNUNET_JSON_pack_data_auto ("h_econtract",
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&h_econtract),
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GNUNET_JSON_pack_data_auto ("econtract_sig",
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&econtract_sig),
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GNUNET_JSON_pack_data_auto ("pub_ckey",
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&pub_ckey));
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return GNUNET_DB_STATUS_HARD_ERROR;
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}
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return qs;
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}
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MHD_RESULT
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TEH_handler_reserves_purse (
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struct MHD_Connection *connection,
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const struct TALER_ReservePublicKeyP *reserve_pub,
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const json_t *root)
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{
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struct ReservePurseContext rpc = {
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.reserve_pub = reserve_pub,
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.exchange_timestamp = GNUNET_TIME_timestamp_get ()
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};
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json_t *deposits;
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json_t *deposit;
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unsigned int idx;
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struct GNUNET_JSON_Specification spec[] = {
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TALER_JSON_spec_amount ("amount",
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TEH_currency,
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&rpc.amount),
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GNUNET_JSON_spec_uint32 ("min_age",
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&rpc.min_age),
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GNUNET_JSON_spec_mark_optional (
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GNUNET_JSON_spec_varsize ("econtract",
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&rpc.econtract,
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&rpc.econtract_size),
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NULL),
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GNUNET_JSON_spec_mark_optional (
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GNUNET_JSON_spec_fixed_auto ("econtract_sig",
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&rpc.econtract_sig),
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NULL),
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GNUNET_JSON_spec_mark_optional (
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GNUNET_JSON_spec_fixed_auto ("contract_pub",
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&rpc.contract_pub),
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NULL),
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GNUNET_JSON_spec_fixed_auto ("merge_pub",
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&rpc.merge_pub),
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GNUNET_JSON_spec_fixed_auto ("purse_sig",
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&rpc.purse_sig),
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GNUNET_JSON_spec_fixed_auto ("h_contract_terms",
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&rpc.h_contract_terms),
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GNUNET_JSON_spec_timestamp ("purse_expiration",
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&rpc.purse_expiration),
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GNUNET_JSON_spec_timestamp ("merge_timestamp",
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&rpc.merge_timestamp),
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GNUNET_JSON_spec_end ()
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};
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const struct TEH_GlobalFee *gf;
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{
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enum GNUNET_GenericReturnValue res;
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res = TALER_MHD_parse_json_data (connection,
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root,
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spec);
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if (GNUNET_SYSERR == res)
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{
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GNUNET_break (0);
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return MHD_NO; /* hard failure */
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}
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if (GNUNET_NO == res)
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{
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GNUNET_break_op (0);
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return MHD_YES; /* failure */
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}
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}
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||||||
|
GNUNET_assert (GNUNET_OK ==
|
||||||
|
TALER_amount_set_zero (TEH_currency,
|
||||||
|
&rpc.deposit_total));
|
||||||
|
if (GNUNET_TIME_timestamp_cmp (rpc.purse_expiration,
|
||||||
|
<,
|
||||||
|
rpc.exchange_timestamp))
|
||||||
|
{
|
||||||
|
GNUNET_break_op (0);
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
return TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_BAD_REQUEST,
|
||||||
|
TALER_EC_EXCHANGE_PURSE_PURSE_EXPIRATION_BEFORE_NOW,
|
||||||
|
NULL);
|
||||||
|
}
|
||||||
|
if (GNUNET_TIME_absolute_is_never (rpc.purse_expiration.abs_time))
|
||||||
|
{
|
||||||
|
GNUNET_break_op (0);
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
return TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_BAD_REQUEST,
|
||||||
|
TALER_EC_EXCHANGE_PURSE_PURSE_EXPIRATION_IS_NEVER,
|
||||||
|
NULL);
|
||||||
|
}
|
||||||
|
gf = TEH_keys_global_fee_by_time (TEH_keys_get_state (),
|
||||||
|
rpc.exchange_timestamp);
|
||||||
|
if (NULL == gf)
|
||||||
|
{
|
||||||
|
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
|
||||||
|
"Cannot purse purse: global fees not configured!\n");
|
||||||
|
return TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_INTERNAL_SERVER_ERROR,
|
||||||
|
TALER_EC_EXCHANGE_GENERIC_GLOBAL_FEES_MISSING,
|
||||||
|
NULL);
|
||||||
|
}
|
||||||
|
|
||||||
|
TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_EDDSA]++;
|
||||||
|
if (GNUNET_OK !=
|
||||||
|
TALER_wallet_purse_purse_verify (rpc.purse_expiration,
|
||||||
|
&rpc.h_contract_terms,
|
||||||
|
&rpc.merge_pub,
|
||||||
|
rpc.min_age,
|
||||||
|
&rpc.amount,
|
||||||
|
rpc.purse_pub,
|
||||||
|
&rpc.purse_sig))
|
||||||
|
{
|
||||||
|
TALER_LOG_WARNING ("Invalid signature on /reserves/$PID/purse request\n");
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
GNUNET_free (rpc.coins);
|
||||||
|
return TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_UNAUTHORIZED,
|
||||||
|
TALER_EC_EXCHANGE_PURSE_PURSE_SIGNATURE_INVALID,
|
||||||
|
NULL);
|
||||||
|
}
|
||||||
|
if ( (NULL != rpc.econtract) &&
|
||||||
|
(GNUNET_OK !=
|
||||||
|
TALER_wallet_econtract_upload_verify (rpc.econtract,
|
||||||
|
rpc.econtract_size,
|
||||||
|
&rpc.contract_pub,
|
||||||
|
purse_pub,
|
||||||
|
&rpc.econtract_sig)) )
|
||||||
|
{
|
||||||
|
TALER_LOG_WARNING ("Invalid signature on /reserves/$PID/purse request\n");
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
GNUNET_free (rpc.coins);
|
||||||
|
return TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_UNAUTHORIZED,
|
||||||
|
TALER_EC_EXCHANGE_PURSE_ECONTRACT_SIGNATURE_INVALID,
|
||||||
|
NULL);
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
if (GNUNET_SYSERR ==
|
||||||
|
TEH_plugin->preflight (TEH_plugin->cls))
|
||||||
|
{
|
||||||
|
GNUNET_break (0);
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
GNUNET_free (rpc.coins);
|
||||||
|
return TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_INTERNAL_SERVER_ERROR,
|
||||||
|
TALER_EC_GENERIC_DB_START_FAILED,
|
||||||
|
"preflight failure");
|
||||||
|
}
|
||||||
|
|
||||||
|
/* execute transaction */
|
||||||
|
{
|
||||||
|
MHD_RESULT mhd_ret;
|
||||||
|
|
||||||
|
if (GNUNET_OK !=
|
||||||
|
TEH_DB_run_transaction (connection,
|
||||||
|
"execute purse purse",
|
||||||
|
TEH_MT_REQUEST_PURSE_PURSE,
|
||||||
|
&mhd_ret,
|
||||||
|
&purse_transaction,
|
||||||
|
&rpc))
|
||||||
|
{
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
GNUNET_free (rpc.coins);
|
||||||
|
return mhd_ret;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* generate regular response */
|
||||||
|
{
|
||||||
|
MHD_RESULT res;
|
||||||
|
|
||||||
|
res = reply_purse_success (connection,
|
||||||
|
&rpc);
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
return res;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/* end of taler-exchange-httpd_reserves_purse.c */
|
||||||
@ -171,6 +171,7 @@ get_run (void *cls,
|
|||||||
ds->is = is;
|
ds->is = is;
|
||||||
ref = TALER_TESTING_interpreter_lookup_command (ds->is,
|
ref = TALER_TESTING_interpreter_lookup_command (ds->is,
|
||||||
ds->contract_ref);
|
ds->contract_ref);
|
||||||
|
GNUNET_assert (NULL != ref);
|
||||||
if (GNUNET_OK !=
|
if (GNUNET_OK !=
|
||||||
TALER_TESTING_get_trait_contract_priv (ref,
|
TALER_TESTING_get_trait_contract_priv (ref,
|
||||||
&contract_priv))
|
&contract_priv))
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user