489 lines
16 KiB
C
489 lines
16 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2015-2020 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 include/taler_bank_service.h
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* @brief C interface of libtalerbank, a C library to use the Taler bank's HTTP API
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* This is currently ONLY used to provide the "test" wire transfer protocol.
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* @author Christian Grothoff
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*/
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#ifndef _TALER_BANK_SERVICE_H
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#define _TALER_BANK_SERVICE_H
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#include <jansson.h>
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#include <gnunet/gnunet_curl_lib.h>
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#include "taler_util.h"
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#include "taler_error_codes.h"
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/**
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* Authentication method types.
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*/
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enum TALER_BANK_AuthenticationMethod
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{
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/**
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* No authentication.
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*/
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TALER_BANK_AUTH_NONE,
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/**
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* Basic authentication with cleartext username and password.
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*/
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TALER_BANK_AUTH_BASIC,
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};
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/**
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* Information used to authenticate to the bank.
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*/
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struct TALER_BANK_AuthenticationData
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{
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/**
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* Base URL we use to talk to the wire gateway,
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* which talks to the bank for us.
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*/
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char *wire_gateway_url;
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/**
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* Which authentication method should we use?
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*/
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enum TALER_BANK_AuthenticationMethod method;
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/**
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* Further details as per @e method.
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*/
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union
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{
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/**
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* Details for #TALER_BANK_AUTH_BASIC.
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*/
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struct
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{
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/**
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* Username to use.
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*/
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char *username;
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/**
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* Password to use.
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*/
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char *password;
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} basic;
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} details;
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};
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/* ********************* /admin/add/incoming *********************** */
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/**
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* @brief A /admin/add/incoming Handle
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*/
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struct TALER_BANK_AdminAddIncomingHandle;
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/**
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* Callbacks of this type are used to serve the result of submitting
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* information about an incoming transaction to a bank.
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*
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* @param cls closure
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* @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
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* 0 if the bank's reply is bogus (fails to follow the protocol)
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* @param ec detailed error code
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* @param serial_id unique ID of the wire transfer in the bank's records; UINT64_MAX on error
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* @param timestamp time when the transaction was made.
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* @param json detailed response from the HTTPD, or NULL if reply was not in JSON
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*/
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typedef void
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(*TALER_BANK_AdminAddIncomingResultCallback) (void *cls,
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unsigned int http_status,
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enum TALER_ErrorCode ec,
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uint64_t serial_id,
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struct GNUNET_TIME_Absolute
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timestamp,
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const json_t *json);
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/**
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* Notify the bank that we have received an incoming transaction
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* which fills a reserve. Note that this API is an administrative
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* API and thus not accessible to typical bank clients, but only
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* to the operators of the bank.
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*
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* @param ctx curl context for the event loop
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* @param auth authentication data to send to the bank
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* @param reserve_pub wire transfer subject for the transfer
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* @param amount amount that was deposited
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* @param debit_account account to deposit from (payto URI, but used as 'payfrom')
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* @param res_cb the callback to call when the final result for this request is available
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* @param res_cb_cls closure for the above callback
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* @return NULL
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* if the inputs are invalid (i.e. invalid amount).
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* In this case, the callback is not called.
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*/
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struct TALER_BANK_AdminAddIncomingHandle *
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TALER_BANK_admin_add_incoming (struct GNUNET_CURL_Context *ctx,
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const struct TALER_BANK_AuthenticationData *auth,
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const struct
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TALER_ReservePublicKeyP *reserve_pub,
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const struct TALER_Amount *amount,
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const char *debit_account,
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TALER_BANK_AdminAddIncomingResultCallback res_cb,
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void *res_cb_cls);
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/**
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* Cancel an add incoming. This function cannot be used on a request
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* handle if a response is already served for it.
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*
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* @param aai the admin add incoming request handle
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*/
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void
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TALER_BANK_admin_add_incoming_cancel (struct
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TALER_BANK_AdminAddIncomingHandle *aai);
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/* ********************* /taler/transfer *********************** */
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/**
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* Prepare for exeuction of a wire transfer.
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*
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* @param destination_account_payto_uri payto:// URL identifying where to send the money
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* @param amount amount to transfer, already rounded
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* @param exchange_base_url base URL of this exchange (included in subject
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* to facilitate use of tracking API by merchant backend)
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* @param wtid wire transfer identifier to use
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* @param[out] buf set to transaction data to persist, NULL on error
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* @param[out] buf_size set to number of bytes in @a buf, 0 on error
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*/
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void
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TALER_BANK_prepare_wire_transfer (const char *destination_account_payto_uri,
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const struct TALER_Amount *amount,
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const char *exchange_base_url,
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const struct
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TALER_WireTransferIdentifierRawP *wtid,
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void **buf,
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size_t *buf_size);
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/**
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* Handle for active wire transfer.
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*/
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struct TALER_BANK_WireExecuteHandle;
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/**
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* Function called with the result from the execute step.
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*
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* @param cls closure
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* @param response_code HTTP status code
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* @param ec taler error code
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* @param row_id unique ID of the wire transfer in the bank's records
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* @param timestamp when did the transaction go into effect
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*/
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typedef void
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(*TALER_BANK_ConfirmationCallback)(void *cls,
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unsigned int response_code,
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enum TALER_ErrorCode ec,
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uint64_t row_id,
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struct GNUNET_TIME_Absolute timestamp);
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/**
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* Execute a wire transfer.
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*
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* @param ctx context for HTTP interaction
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* @param auth authentication data to authenticate with the bank
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* @param buf buffer with the prepared execution details
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* @param buf_size number of bytes in @a buf
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* @param cc function to call upon success
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* @param cc_cls closure for @a cc
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* @return NULL on error
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*/
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struct TALER_BANK_WireExecuteHandle *
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TALER_BANK_execute_wire_transfer (struct GNUNET_CURL_Context *ctx,
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const struct
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TALER_BANK_AuthenticationData *auth,
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const void *buf,
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size_t buf_size,
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TALER_BANK_ConfirmationCallback cc,
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void *cc_cls);
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/**
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* Abort execution of a wire transfer. For example, because we are
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* shutting down. Note that if an execution is aborted, it may or
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* may not still succeed. The caller MUST run @e
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* execute_wire_transfer again for the same request as soon as
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* possilbe, to ensure that the request either ultimately succeeds
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* or ultimately fails. Until this has been done, the transaction is
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* in limbo (i.e. may or may not have been committed).
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*
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* @param weh execution to cancel
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*/
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void
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TALER_BANK_execute_wire_transfer_cancel (struct
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TALER_BANK_WireExecuteHandle *weh);
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/* ********************* /taler/credits *********************** */
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/**
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* Handle for querying the bank for transactions
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* made to the exchange.
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*/
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struct TALER_BANK_CreditHistoryHandle;
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/**
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* Details about a wire transfer to the exchange.
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*/
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struct TALER_BANK_CreditDetails
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{
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/**
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* Amount that was transferred
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*/
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struct TALER_Amount amount;
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/**
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* Time of the the transfer
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*/
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struct GNUNET_TIME_Absolute execution_date;
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/**
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* Reserve public key encoded in the wire
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* transfer subject.
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*/
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struct TALER_ReservePublicKeyP reserve_pub;
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/**
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* payto://-URL of the source account that
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* send the funds.
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*/
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const char *debit_account_url;
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/**
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* payto://-URL of the target account that
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* received the funds.
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*/
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const char *credit_account_url;
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};
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/**
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* Callbacks of this type are used to serve the result of asking
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* the bank for the credit transaction history.
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*
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* @param cls closure
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* @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
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* 0 if the bank's reply is bogus (fails to follow the protocol),
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* #MHD_HTTP_NO_CONTENT if there are no more results; on success the
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* last callback is always of this status (even if `abs(num_results)` were
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* already returned).
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* @param ec detailed error code
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* @param serial_id monotonically increasing counter corresponding to the transaction
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* @param details details about the wire transfer
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* @param json detailed response from the HTTPD, or NULL if reply was not in JSON
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* @return #GNUNET_OK to continue, #GNUNET_SYSERR to abort iteration
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*/
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typedef int
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(*TALER_BANK_CreditResultCallback) (void *cls,
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unsigned int http_status,
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enum TALER_ErrorCode ec,
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uint64_t serial_id,
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const struct
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TALER_BANK_CreditDetails *details,
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const json_t *json);
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/**
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* Request the wire credit history of an exchange's bank account.
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*
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* @param ctx curl context for the event loop
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* @param auth authentication data to use
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* @param start_row from which row on do we want to get results, use UINT64_MAX for the latest; exclusive
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* @param num_results how many results do we want; negative numbers to go into the past,
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* positive numbers to go into the future starting at @a start_row;
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* must not be zero.
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* @param hres_cb the callback to call with the transaction history
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* @param hres_cb_cls closure for the above callback
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* @return NULL
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* if the inputs are invalid (i.e. zero value for @e num_results).
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* In this case, the callback is not called.
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*/
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struct TALER_BANK_CreditHistoryHandle *
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TALER_BANK_credit_history (struct GNUNET_CURL_Context *ctx,
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const struct TALER_BANK_AuthenticationData *auth,
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uint64_t start_row,
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int64_t num_results,
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TALER_BANK_CreditResultCallback hres_cb,
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void *hres_cb_cls);
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/**
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* Cancel an history request. This function cannot be used on a request
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* handle if the last response (anything with a status code other than
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* 200) is already served for it.
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*
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* @param hh the history request handle
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*/
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void
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TALER_BANK_credit_history_cancel (struct TALER_BANK_CreditHistoryHandle *hh);
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/* ********************* /taler/debits *********************** */
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/**
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* Handle for querying the bank for transactions
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* made from the exchange to merchants.
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*/
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struct TALER_BANK_DebitHistoryHandle;
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/**
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* Details about a wire transfer made by the exchange
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* to a merchant.
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*/
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struct TALER_BANK_DebitDetails
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{
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/**
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* Amount that was transferred
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*/
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struct TALER_Amount amount;
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/**
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* Time of the the transfer
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*/
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struct GNUNET_TIME_Absolute execution_date;
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/**
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* Wire transfer identifier used by the exchange.
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*/
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struct TALER_WireTransferIdentifierRawP wtid;
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/**
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* Exchange's base URL as given in the wire transfer.
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*/
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const char *exchange_base_url;
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/**
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* payto://-URL of the source account that
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* send the funds.
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*/
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const char *debit_account_url;
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/**
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* payto://-URL of the target account that
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* received the funds.
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*/
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const char *credit_account_url;
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};
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/**
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* Callbacks of this type are used to serve the result of asking
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* the bank for the debit transaction history.
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*
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* @param cls closure
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* @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
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* 0 if the bank's reply is bogus (fails to follow the protocol),
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* #MHD_HTTP_NO_CONTENT if there are no more results; on success the
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* last callback is always of this status (even if `abs(num_results)` were
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* already returned).
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* @param ec detailed error code
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* @param serial_id monotonically increasing counter corresponding to the transaction
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* @param details details about the wire transfer
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* @param json detailed response from the HTTPD, or NULL if reply was not in JSON
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* @return #GNUNET_OK to continue, #GNUNET_SYSERR to abort iteration
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*/
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typedef int
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(*TALER_BANK_DebitResultCallback) (void *cls,
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unsigned int http_status,
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enum TALER_ErrorCode ec,
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uint64_t serial_id,
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const struct
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TALER_BANK_DebitDetails *details,
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const json_t *json);
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/**
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* Request the wire credit history of an exchange's bank account.
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*
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* @param ctx curl context for the event loop
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* @param auth authentication data to use
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* @param start_row from which row on do we want to get results, use UINT64_MAX for the latest; exclusive
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* @param num_results how many results do we want; negative numbers to go into the past,
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* positive numbers to go into the future starting at @a start_row;
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* must not be zero.
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* @param hres_cb the callback to call with the transaction history
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* @param hres_cb_cls closure for the above callback
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* @return NULL
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* if the inputs are invalid (i.e. zero value for @e num_results).
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* In this case, the callback is not called.
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*/
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struct TALER_BANK_DebitHistoryHandle *
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TALER_BANK_debit_history (struct GNUNET_CURL_Context *ctx,
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const struct TALER_BANK_AuthenticationData *auth,
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uint64_t start_row,
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int64_t num_results,
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TALER_BANK_DebitResultCallback hres_cb,
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void *hres_cb_cls);
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/**
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* Cancel an history request. This function cannot be used on a request
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* handle if the last response (anything with a status code other than
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* 200) is already served for it.
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*
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* @param hh the history request handle
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*/
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void
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TALER_BANK_debit_history_cancel (struct TALER_BANK_DebitHistoryHandle *hh);
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/* ******************** Convenience functions **************** */
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/**
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* Convenience method for parsing configuration section with bank
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* authentication data.
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*
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* @param cfg configuration to parse
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* @param section the section with the configuration data
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* @param[out] auth set to the configuration data found
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* @return #GNUNET_OK on success
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*/
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int
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TALER_BANK_auth_parse_cfg (const struct GNUNET_CONFIGURATION_Handle *cfg,
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const char *section,
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struct TALER_BANK_AuthenticationData *auth);
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/**
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* Free memory inside of @a auth (but not auth itself).
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* Dual to #TALER_BANK_auth_parse_cfg().
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*
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* @param auth authentication data to free
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*/
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void
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TALER_BANK_auth_free (struct TALER_BANK_AuthenticationData *auth);
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#endif /* _TALER_BANK_SERVICE_H */
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