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/*
This file is part of TALER
Copyright (C) 2014-2017 Inria & GNUnet e.V.
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file include/taler_exchangedb_lib.h
* @brief IO operations for the exchange's private keys
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#ifndef TALER_EXCHANGEDB_LIB_H
#define TALER_EXCHANGEDB_LIB_H
#include "taler_signatures.h"
#include "taler_exchangedb_plugin.h"
/**
* Subdirectroy under the exchange's base directory which contains
* the exchange's signing keys.
*/
#define TALER_EXCHANGEDB_DIR_SIGNING_KEYS "signkeys"
/**
* Subdirectory under the exchange's base directory which contains
* the exchange's denomination keys.
*/
#define TALER_EXCHANGEDB_DIR_DENOMINATION_KEYS "denomkeys"
/**
* @brief Iterator over signing keys.
*
* @param cls closure
* @param filename name of the file the key came from
* @param ski the sign key
* @return #GNUNET_OK to continue to iterate,
* #GNUNET_NO to stop iteration with no error,
* #GNUNET_SYSERR to abort iteration with error!
*/
typedef int
(*TALER_EXCHANGEDB_SigningKeyIterator)(void *cls,
const char *filename,
const struct
TALER_EXCHANGEDB_PrivateSigningKeyInformationP
*ski);
/**
* Call @a it for each signing key found in the @a exchange_base_dir.
*
* @param exchange_base_dir base directory for the exchange,
* the signing keys must be in the #TALER_EXCHANGEDB_DIR_SIGNING_KEYS
* subdirectory
* @param it function to call on each signing key
* @param it_cls closure for @a it
* @return number of files found (may not match
* number of keys given to @a it as malformed
* files are simply skipped), -1 on error
*/
int
TALER_EXCHANGEDB_signing_keys_iterate (const char *exchange_base_dir,
TALER_EXCHANGEDB_SigningKeyIterator it,
void *it_cls);
/**
* Exports a signing key to the given file.
*
* @param exchange_base_dir base directory for the keys
* @param start start time of the validity for the key
* @param ski the signing key
* @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure.
*/
int
TALER_EXCHANGEDB_signing_key_write (const char *exchange_base_dir,
struct GNUNET_TIME_Absolute start,
const struct
TALER_EXCHANGEDB_PrivateSigningKeyInformationP
*ski);
/**
* @brief Iterator over denomination keys.
*
* @param cls closure
* @param alias coin alias
* @param dki the denomination key
* @return #GNUNET_OK to continue to iterate,
* #GNUNET_NO to stop iteration with no error,
* #GNUNET_SYSERR to abort iteration with error!
*/
typedef int
(*TALER_EXCHANGEDB_DenominationKeyIterator)(void *cls,
const char *alias,
const struct
TALER_EXCHANGEDB_DenominationKeyIssueInformation
*dki);
/**
* @brief Iterator over revoked denomination keys.
*
* @param cls closure
* @param denom_hash hash of the denomination public key
* @param revocation_master_sig signature showing @a denom_hash was revoked
* @return #GNUNET_OK to continue to iterate,
* #GNUNET_NO to stop iteration with no error,
* #GNUNET_SYSERR to abort iteration with error!
*/
typedef int
(*TALER_EXCHANGEDB_RevocationIterator)(void *cls,
const struct GNUNET_HashCode *denom_hash,
const struct
TALER_MasterSignatureP *
revocation_master_sig);
/**
* Call @a it for each denomination key found in the @a exchange_base_dir.
*
* @param exchange_base_dir base directory for the exchange,
* the signing keys must be in the #TALER_EXCHANGEDB_DIR_DENOMINATION_KEYS
* subdirectory
* @param it function to call on each denomination key found
* @param it_cls closure for @a it
* @return -1 on error, 0 if no files were found, otherwise
* a positive number (however, even with a positive
* number it is possible that @a it was never called
* as maybe none of the files were well-formed)
*/
int
TALER_EXCHANGEDB_denomination_keys_iterate (const char *exchange_base_dir,
TALER_EXCHANGEDB_DenominationKeyIterator
it,
void *it_cls);
/**
* Call @a it for each revoked denomination key found in the @a revocation_dir.
*
* @param revocation_dir base directory where revocations are stored
* @param master_pub master public key (used to check revocations)
* @param it function to call on each revoked denomination key found
* @param it_cls closure for @a it
* @return -1 on error, 0 if no files were found, otherwise
* a positive number (however, even with a positive
* number it is possible that @a it was never called
* as maybe none of the files were well-formed)
*/
int
TALER_EXCHANGEDB_revocations_iterate (const char *revocation_dir,
const struct
TALER_MasterPublicKeyP *master_pub,
TALER_EXCHANGEDB_RevocationIterator it,
void *it_cls);
/**
* Mark the given denomination key as revoked and request the wallets
* to initiate /recoup.
*
* @param revocation_dir where to write the revocation certificate
* @param denom_hash hash of the denomination key to revoke
* @param mpriv master private key to sign with
* @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure.
*/
int
TALER_EXCHANGEDB_denomination_key_revoke (const char *revocation_dir,
const struct
GNUNET_HashCode *denom_hash,
const struct
TALER_MasterPrivateKeyP *mpriv);
/**
* Exports a denomination key to the given file.
*
* @param filename the file where to write the denomination key
* @param dki the denomination key
* @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure.
*/
int
TALER_EXCHANGEDB_denomination_key_write (const char *filename,
const struct
TALER_EXCHANGEDB_DenominationKeyIssueInformation
*dki);
/**
* Import a denomination key from the given file.
*
* @param filename the file to import the key from
* @param[out] dki set to the imported denomination key
* @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure
*/
int
TALER_EXCHANGEDB_denomination_key_read (const char *filename,
struct
TALER_EXCHANGEDB_DenominationKeyIssueInformation
*dki);
/**
* @brief Iterator over auditor information.
*
* @param cls closure
* @param apub the auditor's public key
* @param auditor_url URL of the auditor
* @param mpub the exchange's public key (as expected by the auditor)
* @param dki_len length of @a asig and @a dki arrays
* @param asigs array of the auditor's signatures over the @a dks, of length @a dki_len
* @param dki array of denomination coin data signed by the auditor, of length @a dki_len
* @return #GNUNET_OK to continue to iterate,
* #GNUNET_NO to stop iteration with no error,
* #GNUNET_SYSERR to abort iteration with error!
*/
typedef int
(*TALER_EXCHANGEDB_AuditorIterator)(void *cls,
const struct TALER_AuditorPublicKeyP *apub,
const char *auditor_url,
const struct TALER_MasterPublicKeyP *mpub,
unsigned int dki_len,
const struct TALER_AuditorSignatureP *asigs,
const struct
TALER_DenominationKeyValidityPS *dki);
/**
* Call @a it with information for each auditor found in the
* directory with auditor information as specified in @a cfg.
*
* @param cfg configuration to use
* @param it function to call with auditor information
* @param it_cls closure for @a it
* @return -1 on error, 0 if no files were found, otherwise
* a positive number (however, even with a positive
* number it is possible that @a it was never called
* as maybe none of the files were well-formed)
*/
int
TALER_EXCHANGEDB_auditor_iterate (const struct GNUNET_CONFIGURATION_Handle *cfg,
TALER_EXCHANGEDB_AuditorIterator it,
void *it_cls);
/**
* Write auditor information to the given file.
*
* @param filename the file where to write the auditor information to
* @param apub the auditor's public key
* @param auditor_url the URL of the auditor
* @param asigs the auditor's signatures, array of length @a dki_len
* @param mpub the exchange's public key (as expected by the auditor)
* @param dki_len length of @a dki and @a asigs arrays
* @param dki array of denomination coin data signed by the auditor
* @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure.
*/
int
TALER_EXCHANGEDB_auditor_write (const char *filename,
const struct TALER_AuditorPublicKeyP *apub,
const char *auditor_url,
const struct TALER_AuditorSignatureP *asigs,
const struct TALER_MasterPublicKeyP *mpub,
unsigned int dki_len,
const struct
TALER_DenominationKeyValidityPS *dki);
/**
* Initialize the plugin.
*
* @param cfg configuration to use
* @return NULL on failure
*/
struct TALER_EXCHANGEDB_Plugin *
TALER_EXCHANGEDB_plugin_load (const struct GNUNET_CONFIGURATION_Handle *cfg);
/**
* Shutdown the plugin.
*
* @param plugin plugin to unload
*/
void
TALER_EXCHANGEDB_plugin_unload (struct TALER_EXCHANGEDB_Plugin *plugin);
/**
* Sorted list of fees to be paid for aggregate wire transfers.
*/
struct TALER_EXCHANGEDB_AggregateFees
{
/**
* This is a linked list.
*/
struct TALER_EXCHANGEDB_AggregateFees *next;
/**
* Fee to be paid for wire transfers to a merchant.
*/
struct TALER_Amount wire_fee;
/**
* Fee to be paid when we close a reserve and send funds back.
*/
struct TALER_Amount closing_fee;
/**
* Time when this fee goes into effect (inclusive)
*/
struct GNUNET_TIME_Absolute start_date;
/**
* Time when this fee stops being in effect (exclusive).
*/
struct GNUNET_TIME_Absolute end_date;
/**
* Signature affirming the above fee structure.
*/
struct TALER_MasterSignatureP master_sig;
};
/**
* Read the current fee structure from disk.
*
* @param cfg configuration to use
* @param wireplugin name of the wire plugin to read fees for
* @return sorted list of aggregation fees, NULL on error
*/
struct TALER_EXCHANGEDB_AggregateFees *
TALER_EXCHANGEDB_fees_read (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *wireplugin);
/**
* Convert @a af to @a wf.
*
* @param wiremethod name of the wire method the fees are for
* @param[in,out] af aggregate fees, host format (updated to round time)
* @param[out] wf aggregate fees, disk / signature format
*/
void
TALER_EXCHANGEDB_fees_2_wf (const char *wiremethod,
struct TALER_EXCHANGEDB_AggregateFees *af,
struct TALER_MasterWireFeePS *wf);
/**
* Write given fee structure to disk.
*
* @param filename where to write the fees
* @param wireplugin name of the plugin for which we write the fees
* @param af fee structure to write
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
TALER_EXCHANGEDB_fees_write (const char *filename,
const char *wireplugin,
struct TALER_EXCHANGEDB_AggregateFees *af);
/**
* Free @a af data structure
*
* @param af list to free
*/
void
TALER_EXCHANGEDB_fees_free (struct TALER_EXCHANGEDB_AggregateFees *af);
/**
* Information about an account from the configuration.
*/
struct TALER_EXCHANGEDB_AccountInfo
{
/**
* Section in the configuration file that specifies the
* account. Must start with "account-".
*/
const char *section_name;
/**
* Name of the wire method used by this account.
*/
const char *method;
/**
* payto://-URL of the account.
*/
const char *payto_url;
/**
* Filename containing the signed /wire response, or NULL
* if not given.
*/
const char *wire_response_filename;
/**
* #GNUNET_YES if this account is enabed to be debited
* by the taler-exchange-aggregator.
*/
int debit_enabled;
/**
* #GNUNET_YES if this account is enabed to be credited by wallets
* and needs to be watched by the taler-exchange-wirewatch.
* Also, the account will only be included in /wire if credit
* is enabled.
*/
int credit_enabled;
};
/**
* Function called with information about a wire account.
*
* @param cls closure
* @param ai account information
*/
typedef void
(*TALER_EXCHANGEDB_AccountCallback)(void *cls,
const struct
TALER_EXCHANGEDB_AccountInfo *ai);
/**
* Parse the configuration to find account information.
*
* @param cfg configuration to use
* @param cb callback to invoke
* @param cb_cls closure for @a cb
*/
void
TALER_EXCHANGEDB_find_accounts (const struct GNUNET_CONFIGURATION_Handle *cfg,
TALER_EXCHANGEDB_AccountCallback cb,
void *cb_cls);
/**
* Calculate the total value of all transactions performed.
* Stores @a off plus the cost of all transactions in @a tl
* in @a ret.
*
* @param tl transaction list to process
* @param off offset to use as the starting value
* @param[out] ret where the resulting total is to be stored
* @return #GNUNET_OK on success, #GNUNET_SYSERR on errors
*/
int
TALER_EXCHANGEDB_calculate_transaction_list_totals (struct
TALER_EXCHANGEDB_TransactionList
*tl,
const struct
TALER_Amount *off,
struct TALER_Amount *ret);
#endif
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