200 lines
6.3 KiB
C
200 lines
6.3 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2016 GNUnet e.V.
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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 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 General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file include/taler_wire_plugin.h
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* @brief Plugin API for the handling of wire transactions
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* @author Christian Grothoff
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*/
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#ifndef TALER_WIRE_PLUGIN_H
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#define TALER_WIRE_PLUGIN_H
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#include <gnunet/gnunet_util_lib.h>
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#include <jansson.h>
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#include "taler_util.h"
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/**
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* Callback with prepared transaction.
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*
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* @param cls closure
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* @param buf transaction data to persist, NULL on error
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* @param buf_size number of bytes in @a buf, 0 on error
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*/
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typedef void
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(*TALER_WIRE_PrepareTransactionCallback) (void *cls,
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const char *buf,
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size_t buf_size);
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/**
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* Handle returned for cancelling a preparation step.
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*/
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struct TALER_WIRE_PrepareHandle;
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/**
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* Handle returned for cancelling an execution step.
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*/
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struct TALER_WIRE_ExecuteHandle;
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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 success #GNUNET_OK on success, #GNUNET_SYSERR on failure
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* @param emsg NULL on success, otherwise an error message
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*/
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typedef void
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(*TALER_WIRE_ConfirmationCallback)(void *cls,
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int success,
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const char *emsg);
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/**
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* @brief The plugin API, returned from the plugin's "init" function.
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* The argument given to "init" is simply a configuration handle.
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*/
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struct TALER_WIRE_Plugin
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{
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/**
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* Closure for all callbacks.
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*/
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void *cls;
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/**
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* Name of the library which generated this plugin. Set by the
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* plugin loader.
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*/
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char *library_name;
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/**
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* Round amount DOWN to the amount that can be transferred via the wire
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* method. For example, Taler may support 0.000001 EUR as a unit of
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* payment, but SEPA only supports 0.01 EUR. This function would
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* round 0.125 EUR to 0.12 EUR in this case.
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*
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* @param cls the @e cls of this struct with the plugin-specific state
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* @param[in,out] amount amount to round down
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* @return #GNUNET_OK on success, #GNUNET_NO if rounding was unnecessary,
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* #GNUNET_SYSERR if the amount or currency was invalid
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*/
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int
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(*amount_round) (void *cls,
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struct TALER_Amount *amount);
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/**
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* Obtain wire transfer details in the plugin-specific format
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* from the configuration.
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*
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* @param cls closure
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* @param cfg configuration with details about wire accounts
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* @param account_name which section in the configuration should we parse
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* @return NULL if @a cfg fails to have valid wire details for @a account_name
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*/
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json_t *
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(*get_wire_details)(void *cls,
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const struct GNUNET_CONFIGURATION_Handle *cfg,
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const char *account_name);
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/**
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* Check if the given wire format JSON object is correctly formatted
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*
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* @param cls the @e cls of this struct with the plugin-specific state
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* @param wire the JSON wire format object
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* @param master_pub public key of the exchange to verify against
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* @return #GNUNET_YES if correctly formatted; #GNUNET_NO if not
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*/
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int
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(*wire_validate) (void *cls,
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const json_t *wire,
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const struct TALER_MasterPublicKeyP *master_pub);
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/**
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* Prepare for exeuction of a wire transfer.
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*
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* @param cls the @e cls of this struct with the plugin-specific state
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* @param wire valid wire account information
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* @param amount amount to transfer, already rounded
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* @param wtid wire transfer identifier to use
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* @param ptc function to call with the prepared data to persist
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* @param ptc_cls closure for @a ptc
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* @return NULL on failure
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*/
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struct TALER_WIRE_PrepareHandle *
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(*prepare_wire_transfer) (void *cls,
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const json_t *wire,
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const struct TALER_Amount *amount,
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const struct TALER_WireTransferIdentifierRawP *wtid,
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TALER_WIRE_PrepareTransactionCallback ptc,
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void *ptc_cls);
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/**
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* Abort preparation of a wire transfer. For example,
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* because we are shutting down.
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*
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* @param cls the @e cls of this struct with the plugin-specific state
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* @param pth preparation to cancel
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*/
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void
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(*prepare_wire_transfer_cancel) (void *cls,
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struct TALER_WIRE_PrepareHandle *pth);
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/**
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* Execute a wire transfer.
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*
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* @param cls the @e cls of this struct with the plugin-specific state
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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_WIRE_ExecuteHandle *
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(*execute_wire_transfer) (void *cls,
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const char *buf,
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size_t buf_size,
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TALER_WIRE_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 cls the @e cls of this struct with the plugin-specific state
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* @param eh execution to cancel
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*/
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void
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(*execute_wire_transfer_cancel) (void *cls,
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struct TALER_WIRE_ExecuteHandle *eh);
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};
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#endif /* TALER_WIRE_PLUGIN_H */
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