/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016 Inria & GNUnet e.V.
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
TALER; see the file COPYING. If not, see
*/
/**
* @file taler-exchange-httpd_responses.c
* @brief API for generating the various replies of the exchange; these
* functions are called TEH_RESPONSE_reply_ and they generate
* and queue MHD response objects for a given connection.
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler-exchange-httpd_responses.h"
#include "taler_util.h"
#include "taler_json_lib.h"
#include "taler-exchange-httpd_keystate.h"
/**
* Add headers we want to return in every response.
* Useful for testing, like if we want to always close
* connections.
*
* @param response response to modify
*/
void
TEH_RESPONSE_add_global_headers (struct MHD_Response *response)
{
if (TEH_exchange_connection_close)
GNUNET_break (MHD_YES ==
MHD_add_response_header (response,
MHD_HTTP_HEADER_CONNECTION,
"close"));
}
/**
* Send JSON object as response.
*
* @param connection the MHD connection
* @param json the json object
* @param response_code the http response code
* @return MHD result code
*/
int
TEH_RESPONSE_reply_json (struct MHD_Connection *connection,
const json_t *json,
unsigned int response_code)
{
struct MHD_Response *resp;
char *json_str;
int ret;
json_str = json_dumps (json, JSON_INDENT(2));
GNUNET_assert (NULL != json_str);
resp = MHD_create_response_from_buffer (strlen (json_str),
json_str,
MHD_RESPMEM_MUST_FREE);
if (NULL == resp)
{
free (json_str);
GNUNET_break (0);
return MHD_NO;
}
TEH_RESPONSE_add_global_headers (resp);
(void) MHD_add_response_header (resp,
MHD_HTTP_HEADER_CONTENT_TYPE,
"application/json");
ret = MHD_queue_response (connection,
response_code,
resp);
MHD_destroy_response (resp);
return ret;
}
/**
* Function to call to handle the request by building a JSON
* reply from a format string and varargs.
*
* @param connection the MHD connection to handle
* @param response_code HTTP response code to use
* @param fmt format string for pack
* @param ... varargs
* @return MHD result code
*/
int
TEH_RESPONSE_reply_json_pack (struct MHD_Connection *connection,
unsigned int response_code,
const char *fmt,
...)
{
json_t *json;
va_list argp;
int ret;
json_error_t jerror;
va_start (argp, fmt);
json = json_vpack_ex (&jerror, 0, fmt, argp);
va_end (argp);
if (NULL == json)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to pack JSON with format `%s': %s\n",
fmt,
jerror.text);
GNUNET_break (0);
return MHD_NO;
}
ret = TEH_RESPONSE_reply_json (connection,
json,
response_code);
json_decref (json);
return ret;
}
/**
* Send a response indicating an invalid argument.
*
* @param connection the MHD connection to use
* @param param_name the parameter that is invalid
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_arg_invalid (struct MHD_Connection *connection,
const char *param_name)
{
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{s:s, s:s}",
"error", "invalid parameter",
"parameter", param_name);
}
/**
* Send a response indicating an argument refering to a
* resource unknown to the exchange (i.e. unknown reserve or
* denomination key).
*
* @param connection the MHD connection to use
* @param param_name the parameter that is invalid
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_arg_unknown (struct MHD_Connection *connection,
const char *param_name)
{
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_NOT_FOUND,
"{s:s, s:s}",
"error", "unknown entity referenced",
"parameter", param_name);
}
/**
* Send a response indicating an invalid signature.
*
* @param connection the MHD connection to use
* @param param_name the parameter that is invalid
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_signature_invalid (struct MHD_Connection *connection,
const char *param_name)
{
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_UNAUTHORIZED,
"{s:s, s:s}",
"error", "invalid signature",
"parameter", param_name);
}
/**
* Send a response indicating a missing argument.
*
* @param connection the MHD connection to use
* @param param_name the parameter that is missing
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_arg_missing (struct MHD_Connection *connection,
const char *param_name)
{
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{ s:s, s:s}",
"error", "missing parameter",
"parameter", param_name);
}
/**
* Send a response indicating permission denied.
*
* @param connection the MHD connection to use
* @param hint hint about why access was denied
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_permission_denied (struct MHD_Connection *connection,
const char *hint)
{
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_FORBIDDEN,
"{s:s, s:s}",
"error", "permission denied",
"hint", hint);
}
/**
* Send a response indicating an internal error.
*
* @param connection the MHD connection to use
* @param hint hint about the internal error's nature
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_internal_error (struct MHD_Connection *connection,
const char *hint)
{
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
"{s:s, s:s}",
"error", "internal error",
"hint", hint);
}
/**
* Send a response indicating an external error.
*
* @param connection the MHD connection to use
* @param hint hint about the error's nature
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_external_error (struct MHD_Connection *connection,
const char *hint)
{
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{s:s, s:s}",
"error", "client error",
"hint", hint);
}
/**
* Send a response indicating an error committing a
* transaction (concurrent interference).
*
* @param connection the MHD connection to use
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_commit_error (struct MHD_Connection *connection)
{
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{s:s}",
"error", "commit failure");
}
/**
* Send a response indicating a failure to talk to the Exchange's
* database.
*
* @param connection the MHD connection to use
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_internal_db_error (struct MHD_Connection *connection)
{
return TEH_RESPONSE_reply_internal_error (connection,
"Failed to connect to database");
}
/**
* Send a response indicating that the request was too big.
*
* @param connection the MHD connection to use
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_request_too_large (struct MHD_Connection *connection)
{
struct MHD_Response *resp;
int ret;
resp = MHD_create_response_from_buffer (0,
NULL,
MHD_RESPMEM_PERSISTENT);
if (NULL == resp)
return MHD_NO;
TEH_RESPONSE_add_global_headers (resp);
ret = MHD_queue_response (connection,
MHD_HTTP_REQUEST_ENTITY_TOO_LARGE,
resp);
MHD_destroy_response (resp);
return ret;
}
/**
* Send a response indicating that the JSON was malformed.
*
* @param connection the MHD connection to use
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_invalid_json (struct MHD_Connection *connection)
{
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{s:s}",
"error",
"invalid json");
}
/**
* Send confirmation of deposit success to client. This function
* will create a signed message affirming the given information
* and return it to the client. By this, the exchange affirms that
* the coin had sufficient (residual) value for the specified
* transaction and that it will execute the requested deposit
* operation with the given wiring details.
*
* @param connection connection to the client
* @param coin_pub public key of the coin
* @param h_wire hash of wire details
* @param h_contract hash of contract details
* @param transaction_id transaction ID
* @param timestamp client's timestamp
* @param refund_deadline until when this deposit be refunded
* @param merchant merchant public key
* @param amount_without_fee fraction of coin value to deposit, without the fee
* @return MHD result code
*/
int
TEH_RESPONSE_reply_deposit_success (struct MHD_Connection *connection,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct GNUNET_HashCode *h_wire,
const struct GNUNET_HashCode *h_contract,
uint64_t transaction_id,
struct GNUNET_TIME_Absolute timestamp,
struct GNUNET_TIME_Absolute refund_deadline,
const struct TALER_MerchantPublicKeyP *merchant,
const struct TALER_Amount *amount_without_fee)
{
struct TALER_DepositConfirmationPS dc;
struct TALER_ExchangePublicKeyP pub;
struct TALER_ExchangeSignatureP sig;
dc.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT);
dc.purpose.size = htonl (sizeof (struct TALER_DepositConfirmationPS));
dc.h_contract = *h_contract;
dc.h_wire = *h_wire;
dc.transaction_id = GNUNET_htonll (transaction_id);
dc.timestamp = GNUNET_TIME_absolute_hton (timestamp);
dc.refund_deadline = GNUNET_TIME_absolute_hton (refund_deadline);
TALER_amount_hton (&dc.amount_without_fee,
amount_without_fee);
dc.coin_pub = *coin_pub;
dc.merchant = *merchant;
TEH_KS_sign (&dc.purpose,
&pub,
&sig);
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:s, s:o, s:o}",
"status", "DEPOSIT_OK",
"sig", GNUNET_JSON_from_data_auto (&sig),
"pub", GNUNET_JSON_from_data_auto (&pub));
}
/**
* Compile the transaction history of a coin into a JSON object.
*
* @param tl transaction history to JSON-ify
* @return json representation of the @a rh
*/
static json_t *
compile_transaction_history (const struct TALER_EXCHANGEDB_TransactionList *tl)
{
json_t *details;
const char *type;
struct TALER_Amount value;
json_t *history;
const struct GNUNET_CRYPTO_EddsaSignature *sig;
const struct TALER_EXCHANGEDB_TransactionList *pos;
history = json_array ();
for (pos = tl; NULL != pos; pos = pos->next)
{
switch (pos->type)
{
case TALER_EXCHANGEDB_TT_DEPOSIT:
{
struct TALER_DepositRequestPS dr;
const struct TALER_EXCHANGEDB_Deposit *deposit = pos->details.deposit;
type = "DEPOSIT";
value = deposit->amount_with_fee;
dr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_DEPOSIT);
dr.purpose.size = htonl (sizeof (struct TALER_DepositRequestPS));
dr.h_contract = deposit->h_contract;
dr.h_wire = deposit->h_wire;
dr.timestamp = GNUNET_TIME_absolute_hton (deposit->timestamp);
dr.refund_deadline = GNUNET_TIME_absolute_hton (deposit->refund_deadline);
dr.transaction_id = GNUNET_htonll (deposit->transaction_id);
TALER_amount_hton (&dr.amount_with_fee,
&deposit->amount_with_fee);
TALER_amount_hton (&dr.deposit_fee,
&deposit->deposit_fee);
dr.merchant = deposit->merchant_pub;
dr.coin_pub = deposit->coin.coin_pub;
sig = &deposit->csig.eddsa_signature;
/* internal sanity check before we hand out a bogus sig... */
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WALLET_COIN_DEPOSIT,
&dr.purpose,
sig,
&deposit->coin.coin_pub.eddsa_pub))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
details = GNUNET_JSON_from_data_auto (&dr);
break;
}
case TALER_EXCHANGEDB_TT_REFRESH_MELT:
{
struct TALER_RefreshMeltCoinAffirmationPS ms;
const struct TALER_EXCHANGEDB_RefreshMelt *melt = pos->details.melt;
type = "MELT";
value = melt->amount_with_fee;
ms.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_MELT);
ms.purpose.size = htonl (sizeof (struct TALER_RefreshMeltCoinAffirmationPS));
ms.session_hash = melt->session_hash;
TALER_amount_hton (&ms.amount_with_fee,
&melt->amount_with_fee);
TALER_amount_hton (&ms.melt_fee,
&melt->melt_fee);
ms.coin_pub = melt->coin.coin_pub;
sig = &melt->coin_sig.eddsa_signature;
/* internal sanity check before we hand out a bogus sig... */
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WALLET_COIN_MELT,
&ms.purpose,
sig,
&melt->coin.coin_pub.eddsa_pub))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
details = GNUNET_JSON_from_data_auto (&ms);
}
break;
case TALER_EXCHANGEDB_TT_REFUND:
{
struct TALER_RefundRequestPS rr;
const struct TALER_EXCHANGEDB_Refund *refund = pos->details.refund;
type = "REFUND";
if (GNUNET_OK !=
TALER_amount_subtract (&value,
&refund->refund_amount,
&refund->refund_fee))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
rr.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_REFUND);
rr.purpose.size = htonl (sizeof (struct TALER_RefundRequestPS));
rr.h_contract = refund->h_contract;
rr.transaction_id = GNUNET_htonll (refund->transaction_id);
rr.coin_pub = refund->coin.coin_pub;
rr.merchant = refund->merchant_pub;
rr.rtransaction_id = GNUNET_htonll (refund->rtransaction_id);
TALER_amount_hton (&rr.refund_amount,
&refund->refund_amount);
TALER_amount_hton (&rr.refund_fee,
&refund->refund_fee);
/* internal sanity check before we hand out a bogus sig... */
sig = &refund->merchant_sig.eddsa_sig;
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MERCHANT_REFUND,
&rr.purpose,
sig,
&refund->merchant_pub.eddsa_pub))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
details = GNUNET_JSON_from_data_auto (&rr);
}
break;
default:
GNUNET_assert (0);
}
GNUNET_assert (0 ==
json_array_append_new (history,
json_pack ("{s:s, s:o, s:o, s:o}",
"type", type,
"amount", TALER_JSON_from_amount (&value),
"signature", GNUNET_JSON_from_data_auto (sig),
"details", details)));
}
return history;
}
/**
* Send proof that a /deposit request is invalid to client. This
* function will create a message with all of the operations affecting
* the coin that demonstrate that the coin has insufficient value.
*
* @param connection connection to the client
* @param tl transaction list to use to build reply
* @return MHD result code
*/
int
TEH_RESPONSE_reply_deposit_insufficient_funds (struct MHD_Connection *connection,
const struct TALER_EXCHANGEDB_TransactionList *tl)
{
json_t *history;
history = compile_transaction_history (tl);
if (NULL == history)
return TEH_RESPONSE_reply_internal_db_error (connection);
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_FORBIDDEN,
"{s:s, s:o}",
"error", "insufficient funds",
"history", history);
}
/**
* Compile the history of a reserve into a JSON object
* and calculate the total balance.
*
* @param rh reserve history to JSON-ify
* @param[out] balance set to current reserve balance
* @return json representation of the @a rh, NULL on error
*/
static json_t *
compile_reserve_history (const struct TALER_EXCHANGEDB_ReserveHistory *rh,
struct TALER_Amount *balance)
{
struct TALER_Amount deposit_total;
struct TALER_Amount withdraw_total;
struct TALER_Amount value;
json_t *json_history;
int ret;
const struct TALER_EXCHANGEDB_ReserveHistory *pos;
struct TALER_WithdrawRequestPS wr;
json_history = json_array ();
ret = 0;
for (pos = rh; NULL != pos; pos = pos->next)
{
switch (pos->type)
{
case TALER_EXCHANGEDB_RO_BANK_TO_EXCHANGE:
if (0 == ret)
deposit_total = pos->details.bank->amount;
else
if (GNUNET_OK !=
TALER_amount_add (&deposit_total,
&deposit_total,
&pos->details.bank->amount))
{
json_decref (json_history);
return NULL;
}
ret = 1;
GNUNET_assert (0 ==
json_array_append_new (json_history,
json_pack ("{s:s, s:O, s:O, s:o}",
"type", "DEPOSIT",
"sender_account_details", pos->details.bank->sender_account_details,
"transfer_details", pos->details.bank->transfer_details,
"amount", TALER_JSON_from_amount (&pos->details.bank->amount))));
break;
case TALER_EXCHANGEDB_RO_WITHDRAW_COIN:
break;
}
}
ret = 0;
for (pos = rh; NULL != pos; pos = pos->next)
{
switch (pos->type)
{
case TALER_EXCHANGEDB_RO_BANK_TO_EXCHANGE:
break;
case TALER_EXCHANGEDB_RO_WITHDRAW_COIN:
value = pos->details.withdraw->amount_with_fee;
if (0 == ret)
{
withdraw_total = value;
}
else
{
if (GNUNET_OK !=
TALER_amount_add (&withdraw_total,
&withdraw_total,
&value))
{
json_decref (json_history);
return NULL;
}
}
ret = 1;
wr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_RESERVE_WITHDRAW);
wr.purpose.size = htonl (sizeof (struct TALER_WithdrawRequestPS));
wr.reserve_pub = pos->details.withdraw->reserve_pub;
TALER_amount_hton (&wr.amount_with_fee,
&value);
TALER_amount_hton (&wr.withdraw_fee,
&pos->details.withdraw->withdraw_fee);
GNUNET_CRYPTO_rsa_public_key_hash (pos->details.withdraw->denom_pub.rsa_public_key,
&wr.h_denomination_pub);
wr.h_coin_envelope = pos->details.withdraw->h_coin_envelope;
GNUNET_assert (0 ==
json_array_append_new (json_history,
json_pack ("{s:s, s:o, s:o, s:o}",
"type", "WITHDRAW",
"signature", GNUNET_JSON_from_data_auto (&pos->details.withdraw->reserve_sig),
"details", GNUNET_JSON_from_data_auto (&wr),
"amount", TALER_JSON_from_amount (&value))));
break;
}
}
if (0 == ret)
{
/* did not encounter any withdraw operations, set to zero */
TALER_amount_get_zero (deposit_total.currency,
&withdraw_total);
}
if (GNUNET_SYSERR ==
TALER_amount_subtract (balance,
&deposit_total,
&withdraw_total))
{
GNUNET_break (0);
json_decref (json_history);
return NULL;
}
return json_history;
}
/**
* Generate refund conflict failure message. Returns the
* transaction list @a tl with the details about the conflict.
*
* @param connection connection to the client
* @param tl transaction list showing the conflict
* @return MHD result code
*/
int
TEH_RESPONSE_reply_refund_conflict (struct MHD_Connection *connection,
const struct TALER_EXCHANGEDB_TransactionList *tl)
{
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_CONFLICT,
"{s:s, s:o}",
"status", "conflicting refund",
"history", compile_transaction_history (tl));
}
/**
* Generate generic refund failure message. All the details
* are in the @a response_code. The body can be empty.
*
* @param connection connection to the client
* @param response_code response code to generate
* @return MHD result code
*/
int
TEH_RESPONSE_reply_refund_failure (struct MHD_Connection *connection,
unsigned int response_code)
{
return TEH_RESPONSE_reply_json_pack (connection,
response_code,
"{s:s}",
"error",
"no details");
}
/**
* Generate successful refund confirmation message.
*
* @param connection connection to the client
* @param refund details about the successful refund
* @return MHD result code
*/
int
TEH_RESPONSE_reply_refund_success (struct MHD_Connection *connection,
const struct TALER_EXCHANGEDB_Refund *refund)
{
struct TALER_RefundConfirmationPS rc;
struct TALER_ExchangePublicKeyP pub;
struct TALER_ExchangeSignatureP sig;
rc.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_REFUND);
rc.purpose.size = htonl (sizeof (struct TALER_RefundConfirmationPS));
rc.h_contract = refund->h_contract;
rc.transaction_id = GNUNET_htonll (refund->transaction_id);
rc.coin_pub = refund->coin.coin_pub;
rc.merchant = refund->merchant_pub;
rc.rtransaction_id = GNUNET_htonll (refund->rtransaction_id);
TALER_amount_hton (&rc.refund_amount,
&refund->refund_amount);
TALER_amount_hton (&rc.refund_fee,
&refund->refund_fee);
TEH_KS_sign (&rc.purpose,
&pub,
&sig);
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:s, s:o, s:o}",
"status", "REFUND_OK",
"sig", GNUNET_JSON_from_data_auto (&sig),
"pub", GNUNET_JSON_from_data_auto (&pub));
}
/**
* Send reserve status information to client.
*
* @param connection connection to the client
* @param rh reserve history to return
* @return MHD result code
*/
int
TEH_RESPONSE_reply_reserve_status_success (struct MHD_Connection *connection,
const struct TALER_EXCHANGEDB_ReserveHistory *rh)
{
json_t *json_balance;
json_t *json_history;
struct TALER_Amount balance;
json_history = compile_reserve_history (rh,
&balance);
if (NULL == json_history)
return TEH_RESPONSE_reply_internal_error (connection,
"balance calculation failure");
json_balance = TALER_JSON_from_amount (&balance);
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:o, s:o}",
"balance", json_balance,
"history", json_history);
}
/**
* Send reserve status information to client with the
* message that we have insufficient funds for the
* requested /reserve/withdraw operation.
*
* @param connection connection to the client
* @param rh reserve history to return
* @return MHD result code
*/
int
TEH_RESPONSE_reply_reserve_withdraw_insufficient_funds (struct MHD_Connection *connection,
const struct TALER_EXCHANGEDB_ReserveHistory *rh)
{
json_t *json_balance;
json_t *json_history;
struct TALER_Amount balance;
json_history = compile_reserve_history (rh,
&balance);
if (NULL == json_history)
return TEH_RESPONSE_reply_internal_error (connection,
"balance calculation failure");
json_balance = TALER_JSON_from_amount (&balance);
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_PAYMENT_REQUIRED,
"{s:s, s:o, s:o}",
"error", "Insufficient funds",
"balance", json_balance,
"history", json_history);
}
/**
* Send blinded coin information to client.
*
* @param connection connection to the client
* @param collectable blinded coin to return
* @return MHD result code
*/
int
TEH_RESPONSE_reply_reserve_withdraw_success (struct MHD_Connection *connection,
const struct TALER_EXCHANGEDB_CollectableBlindcoin *collectable)
{
json_t *sig_json;
sig_json = GNUNET_JSON_from_rsa_signature (collectable->sig.rsa_signature);
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:o}",
"ev_sig", sig_json);
}
/**
* Send a response for a failed "/refresh/melt" request. The
* transaction history of the given coin demonstrates that the
* @a residual value of the coin is below the @a requested
* contribution of the coin for the melt. Thus, the exchange
* refuses the melt operation.
*
* @param connection the connection to send the response to
* @param coin_pub public key of the coin
* @param coin_value original value of the coin
* @param tl transaction history for the coin
* @param requested how much this coin was supposed to contribute, including fee
* @param residual remaining value of the coin (after subtracting @a tl)
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_refresh_melt_insufficient_funds (struct MHD_Connection *connection,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
struct TALER_Amount coin_value,
struct TALER_EXCHANGEDB_TransactionList *tl,
struct TALER_Amount requested,
struct TALER_Amount residual)
{
json_t *history;
history = compile_transaction_history (tl);
if (NULL == history)
return TEH_RESPONSE_reply_internal_db_error (connection);
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_FORBIDDEN,
"{s:s, s:o, s:o, s:o, s:o, s:o}",
"error",
"insufficient funds",
"coin_pub",
GNUNET_JSON_from_data_auto (coin_pub),
"original_value",
TALER_JSON_from_amount (&coin_value),
"residual_value",
TALER_JSON_from_amount (&residual),
"requested_value",
TALER_JSON_from_amount (&requested),
"history",
history);
}
/**
* Send a response to a "/refresh/melt" request.
*
* @param connection the connection to send the response to
* @param session_hash hash of the refresh session
* @param noreveal_index which index will the client not have to reveal
* @return a MHD status code
*/
int
TEH_RESPONSE_reply_refresh_melt_success (struct MHD_Connection *connection,
const struct GNUNET_HashCode *session_hash,
uint16_t noreveal_index)
{
struct TALER_RefreshMeltConfirmationPS body;
struct TALER_ExchangePublicKeyP pub;
struct TALER_ExchangeSignatureP sig;
json_t *sig_json;
body.purpose.size = htonl (sizeof (struct TALER_RefreshMeltConfirmationPS));
body.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_MELT);
body.session_hash = *session_hash;
body.noreveal_index = htons (noreveal_index);
body.reserved = htons (0);
TEH_KS_sign (&body.purpose,
&pub,
&sig);
sig_json = GNUNET_JSON_from_data_auto (&sig);
GNUNET_assert (NULL != sig_json);
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:i, s:o, s:o}",
"noreveal_index", (int) noreveal_index,
"exchange_sig", sig_json,
"exchange_pub", GNUNET_JSON_from_data_auto (&pub));
}
/**
* Send a response for "/refresh/reveal".
*
* @param connection the connection to send the response to
* @param num_newcoins number of new coins for which we reveal data
* @param sigs array of @a num_newcoins signatures revealed
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_refresh_reveal_success (struct MHD_Connection *connection,
unsigned int num_newcoins,
const struct TALER_DenominationSignature *sigs)
{
int newcoin_index;
json_t *root;
json_t *obj;
json_t *list;
int ret;
list = json_array ();
for (newcoin_index = 0; newcoin_index < num_newcoins; newcoin_index++)
{
obj = json_object ();
json_object_set_new (obj,
"ev_sig",
GNUNET_JSON_from_rsa_signature (sigs[newcoin_index].rsa_signature));
GNUNET_assert (0 ==
json_array_append_new (list,
obj));
}
root = json_object ();
json_object_set_new (root,
"ev_sigs",
list);
ret = TEH_RESPONSE_reply_json (connection,
root,
MHD_HTTP_OK);
json_decref (root);
return ret;
}
/**
* Send a response for a failed "/refresh/reveal", where the
* revealed value(s) do not match the original commitment.
*
* @param connection the connection to send the response to
* @param session info about session
* @param commit_coins array of @a num_newcoins committed envelopes at offset @a gamma
* @param denom_pubs array of @a num_newcoins denomination keys for the new coins
* @param gamma_tp transfer public key at offset @a gamma
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_refresh_reveal_missmatch (struct MHD_Connection *connection,
const struct TALER_EXCHANGEDB_RefreshSession *session,
const struct TALER_EXCHANGEDB_RefreshCommitCoin *commit_coins,
const struct TALER_DenominationPublicKey *denom_pubs,
const struct TALER_TransferPublicKeyP *gamma_tp)
{
json_t *info_new;
json_t *info_commit_k;
unsigned int i;
info_new = json_array ();
info_commit_k = json_array ();
for (i=0;inum_newcoins;i++)
{
const struct TALER_EXCHANGEDB_RefreshCommitCoin *cc;
json_t *cc_json;
GNUNET_assert (0 ==
json_array_append_new (info_new,
GNUNET_JSON_from_rsa_public_key (denom_pubs[i].rsa_public_key)));
cc = &commit_coins[i];
cc_json = json_pack ("{s:o}",
"coin_ev",
GNUNET_JSON_from_data (cc->coin_ev,
cc->coin_ev_size));
GNUNET_assert (0 ==
json_array_append_new (info_commit_k,
cc_json));
}
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_CONFLICT,
"{s:s, s:o, s:o, s:o, s:o, s:o, s:o, s:o, s:i}",
"error", "commitment violation",
"coin_sig", GNUNET_JSON_from_data_auto (&session->melt.coin_sig),
"coin_pub", GNUNET_JSON_from_data_auto (&session->melt.coin.coin_pub),
"melt_amount_with_fee", TALER_JSON_from_amount (&session->melt.amount_with_fee),
"melt_fee", TALER_JSON_from_amount (&session->melt.melt_fee),
"newcoin_infos", info_new,
"commit_infos", info_commit_k,
"gamma_tp", GNUNET_JSON_from_data_auto (gamma_tp),
"gamma", (int) session->noreveal_index);
}
/**
* Send a response for "/refresh/link".
*
* @param connection the connection to send the response to
* @param num_sessions number of sessions the coin was used in
* @param sessions array of @a num_session entries with
* information for each session
* @return a MHD result code
*/
int
TEH_RESPONSE_reply_refresh_link_success (struct MHD_Connection *connection,
unsigned int num_sessions,
const struct TEH_RESPONSE_LinkSessionInfo *sessions)
{
json_t *root;
json_t *mlist;
int res;
unsigned int i;
mlist = json_array ();
for (i=0;inext)
{
json_t *obj;
obj = json_object ();
json_object_set_new (obj,
"denom_pub",
GNUNET_JSON_from_rsa_public_key (pos->denom_pub.rsa_public_key));
json_object_set_new (obj,
"ev_sig",
GNUNET_JSON_from_rsa_signature (pos->ev_sig.rsa_signature));
GNUNET_assert (0 ==
json_array_append_new (list,
obj));
}
root = json_object ();
json_object_set_new (root,
"new_coins",
list);
json_object_set_new (root,
"transfer_pub",
GNUNET_JSON_from_data_auto (&sessions[i].transfer_pub));
GNUNET_assert (0 ==
json_array_append_new (mlist,
root));
}
res = TEH_RESPONSE_reply_json (connection,
mlist,
MHD_HTTP_OK);
json_decref (mlist);
return res;
}
/**
* A merchant asked for details about a deposit, but
* we do not know anything about the deposit. Generate the
* 404 reply.
*
* @param connection connection to the client
* @return MHD result code
*/
int
TEH_RESPONSE_reply_transaction_unknown (struct MHD_Connection *connection)
{
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_NOT_FOUND,
"{s:s}",
"error", "Deposit unknown");
}
/**
* A merchant asked for details about a deposit, but
* we did not execute the deposit yet. Generate a 202 reply.
*
* @param connection connection to the client
* @param planned_exec_time planned execution time
* @return MHD result code
*/
int
TEH_RESPONSE_reply_transfer_pending (struct MHD_Connection *connection,
struct GNUNET_TIME_Absolute planned_exec_time)
{
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_ACCEPTED,
"{s:o}",
"execution_time", GNUNET_JSON_from_time_abs (planned_exec_time));
}
/**
* A merchant asked for details about a deposit. Provide
* them. Generates the 200 reply.
*
* @param connection connection to the client
* @param h_contract hash of the contract
* @param h_wire hash of wire account details
* @param coin_pub public key of the coin
* @param coin_contribution how much did the coin we asked about
* contribute to the total transfer value? (deposit value minus fee)
* @param transaction_id merchant transaction identifier
* @param wtid raw wire transfer identifier
* @param exec_time execution time of the wire transfer
* @return MHD result code
*/
int
TEH_RESPONSE_reply_track_transaction (struct MHD_Connection *connection,
const struct GNUNET_HashCode *h_contract,
const struct GNUNET_HashCode *h_wire,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct TALER_Amount *coin_contribution,
uint64_t transaction_id,
const struct TALER_WireTransferIdentifierRawP *wtid,
struct GNUNET_TIME_Absolute exec_time)
{
struct TALER_ConfirmWirePS cw;
struct TALER_ExchangePublicKeyP pub;
struct TALER_ExchangeSignatureP sig;
cw.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE);
cw.purpose.size = htonl (sizeof (struct TALER_ConfirmWirePS));
cw.h_wire = *h_wire;
cw.h_contract = *h_contract;
cw.wtid = *wtid;
cw.coin_pub = *coin_pub;
cw.transaction_id = GNUNET_htonll (transaction_id);
cw.execution_time = GNUNET_TIME_absolute_hton (exec_time);
TALER_amount_hton (&cw.coin_contribution,
coin_contribution);
TEH_KS_sign (&cw.purpose,
&pub,
&sig);
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:o, s:o, s:o, s:o, s:o}",
"wtid", GNUNET_JSON_from_data_auto (wtid),
"execution_time", GNUNET_JSON_from_time_abs (exec_time),
"coin_contribution", TALER_JSON_from_amount (coin_contribution),
"exchange_sig", GNUNET_JSON_from_data_auto (&sig),
"exchange_pub", GNUNET_JSON_from_data_auto (&pub));
}
/**
* A merchant asked for transaction details about a wire transfer.
* Provide them. Generates the 200 reply.
*
* @param connection connection to the client
* @param total total amount that was transferred
* @param merchant_pub public key of the merchant
* @param h_wire destination account
* @param exec_time execution time of the wire transfer
* @param wdd_head linked list with details about the combined deposits
* @return MHD result code
*/
int
TEH_RESPONSE_reply_track_transfer_details (struct MHD_Connection *connection,
const struct TALER_Amount *total,
const struct TALER_MerchantPublicKeyP *merchant_pub,
const struct GNUNET_HashCode *h_wire,
struct GNUNET_TIME_Absolute exec_time,
const struct TEH_TrackTransferDetail *wdd_head)
{
const struct TEH_TrackTransferDetail *wdd_pos;
json_t *deposits;
struct TALER_WireDepositDetailP dd;
struct GNUNET_HashContext *hash_context;
struct TALER_WireDepositDataPS wdp;
struct TALER_ExchangePublicKeyP pub;
struct TALER_ExchangeSignatureP sig;
GNUNET_TIME_round_abs (&exec_time);
deposits = json_array ();
hash_context = GNUNET_CRYPTO_hash_context_start ();
for (wdd_pos = wdd_head; NULL != wdd_pos; wdd_pos = wdd_pos->next)
{
dd.h_contract = wdd_pos->h_contract;
dd.execution_time = GNUNET_TIME_absolute_hton (exec_time);
dd.transaction_id = GNUNET_htonll (wdd_pos->transaction_id);
dd.coin_pub = wdd_pos->coin_pub;
TALER_amount_hton (&dd.deposit_value,
&wdd_pos->deposit_value);
TALER_amount_hton (&dd.deposit_fee,
&wdd_pos->deposit_fee);
GNUNET_CRYPTO_hash_context_read (hash_context,
&dd,
sizeof (struct TALER_WireDepositDetailP));
GNUNET_assert (0 ==
json_array_append_new (deposits,
json_pack ("{s:o, s:I, s:o, s:o, s:o}",
"H_contract", GNUNET_JSON_from_data_auto (&wdd_pos->h_contract),
"transaction_id", (json_int_t) wdd_pos->transaction_id,
"coin_pub", GNUNET_JSON_from_data_auto (&wdd_pos->coin_pub),
"deposit_value", TALER_JSON_from_amount (&wdd_pos->deposit_value),
"deposit_fee", TALER_JSON_from_amount (&wdd_pos->deposit_fee))));
}
wdp.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE_DEPOSIT);
wdp.purpose.size = htonl (sizeof (struct TALER_WireDepositDataPS));
TALER_amount_hton (&wdp.total,
total);
wdp.merchant_pub = *merchant_pub;
wdp.h_wire = *h_wire;
GNUNET_CRYPTO_hash_context_finish (hash_context,
&wdp.h_details);
TEH_KS_sign (&wdp.purpose,
&pub,
&sig);
return TEH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:o, s:o, s:o, s:o, s:o, s:o, s:o}",
"total", TALER_JSON_from_amount (total),
"merchant_pub", GNUNET_JSON_from_data_auto (merchant_pub),
"H_wire", GNUNET_JSON_from_data_auto (h_wire),
"execution_time", GNUNET_JSON_from_time_abs (exec_time),
"deposits", deposits,
"exchange_sig", GNUNET_JSON_from_data_auto (&sig),
"exchange_pub", GNUNET_JSON_from_data_auto (&pub));
}
/* end of taler-exchange-httpd_responses.c */