/*
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 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_refresh_link.c
* @brief Handle /refresh/link requests
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include
#include
#include "taler-exchange-httpd_parsing.h"
#include "taler-exchange-httpd_mhd.h"
#include "taler-exchange-httpd_refresh_link.h"
#include "taler-exchange-httpd_responses.h"
#include "taler-exchange-httpd_keystate.h"
/**
* Closure for #handle_transfer_data().
*/
struct HTD_Context
{
/**
* Public key of the coin for which we are running /refresh/link.
*/
struct TALER_CoinSpendPublicKeyP coin_pub;
/**
* Json array with transfer data we collect.
*/
json_t *mlist;
/**
* Taler error code.
*/
enum TALER_ErrorCode ec;
};
/**
* Function called with the session hashes and transfer secret
* information for a given coin. Gets the linkage data and
* builds the reply for the client.
*
*
* @param cls closure, a `struct HTD_Context`
* @param transfer_pub public transfer key for the session
* @param ldl link data related to @a transfer_pub
*/
static void
handle_link_data (void *cls,
const struct TALER_TransferPublicKeyP *transfer_pub,
const struct TALER_EXCHANGEDB_LinkDataList *ldl)
{
struct HTD_Context *ctx = cls;
json_t *list;
json_t *root;
if (NULL == ctx->mlist)
return;
if (NULL == (list = json_array ()))
goto fail;
for (const struct TALER_EXCHANGEDB_LinkDataList *pos = ldl;
NULL != pos;
pos = pos->next)
{
json_t *obj;
if (NULL == (obj = json_object ()))
goto fail;
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));
if (0 !=
json_array_append_new (list,
obj))
goto fail;
}
if (NULL == (root = json_object ()))
goto fail;
json_object_set_new (root,
"new_coins",
list);
json_object_set_new (root,
"transfer_pub",
GNUNET_JSON_from_data_auto (transfer_pub));
if (0 !=
json_array_append_new (ctx->mlist,
root))
goto fail;
return;
fail:
ctx->ec = TALER_EC_JSON_ALLOCATION_FAILURE;
json_decref (ctx->mlist);
ctx->mlist = NULL;
}
/**
* Execute a "/refresh/link". Returns the linkage information that
* will allow the owner of a coin to follow the refresh trail to
* the refreshed coin.
*
* If it returns a non-error code, the transaction logic MUST
* NOT queue a MHD response. IF it returns an hard error, the
* transaction logic MUST queue a MHD response and set @a mhd_ret. IF
* it returns the soft error code, the function MAY be called again to
* retry and MUST not queue a MHD response.
*
* @param cls closure
* @param connection MHD request which triggered the transaction
* @param session database session to use
* @param[out] mhd_ret set to MHD response status for @a connection,
* if transaction failed (!)
* @return transaction status
*/
static enum GNUNET_DB_QueryStatus
refresh_link_transaction (void *cls,
struct MHD_Connection *connection,
struct TALER_EXCHANGEDB_Session *session,
int *mhd_ret)
{
struct HTD_Context *ctx = cls;
enum GNUNET_DB_QueryStatus qs;
qs = TEH_plugin->get_link_data (TEH_plugin->cls,
session,
&ctx->coin_pub,
&handle_link_data,
ctx);
if (NULL == ctx->mlist)
{
*mhd_ret = TEH_RESPONSE_reply_internal_error (connection,
ctx->ec,
"coin_pub");
return GNUNET_DB_STATUS_HARD_ERROR;
}
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
{
*mhd_ret = TEH_RESPONSE_reply_arg_unknown (connection,
TALER_EC_REFRESH_LINK_COIN_UNKNOWN,
"coin_pub");
return GNUNET_DB_STATUS_HARD_ERROR;
}
return qs;
}
/**
* Handle a "/refresh/link" request. Note that for "/refresh/link"
* we do use a simple HTTP GET, and a HTTP POST!
*
* @param rh context of the handler
* @param connection the MHD connection to handle
* @param[in,out] connection_cls the connection's closure (can be updated)
* @param upload_data upload data
* @param[in,out] upload_data_size number of bytes (left) in @a upload_data
* @return MHD result code
*/
int
TEH_REFRESH_handler_refresh_link (struct TEH_RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size)
{
int mhd_ret;
int res;
struct HTD_Context ctx;
memset (&ctx,
0,
sizeof (ctx));
res = TEH_PARSE_mhd_request_arg_data (connection,
"coin_pub",
&ctx.coin_pub,
sizeof (struct TALER_CoinSpendPublicKeyP));
if (GNUNET_SYSERR == res)
return MHD_NO;
if (GNUNET_OK != res)
return MHD_YES;
ctx.mlist = json_array ();
if (GNUNET_OK !=
TEH_DB_run_transaction (connection,
"run link",
&mhd_ret,
&refresh_link_transaction,
&ctx))
{
if (NULL != ctx.mlist)
json_decref (ctx.mlist);
return mhd_ret;
}
mhd_ret = TEH_RESPONSE_reply_json (connection,
ctx.mlist,
MHD_HTTP_OK);
json_decref (ctx.mlist);
return mhd_ret;
}
/* end of taler-exchange-httpd_refresh_link.c */