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restructuring more of deposit logic towards desired flow structure

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This commit is contained in:
Christian Grothoff 2015-01-19 21:04:58 +01:00
parent 3553e60733
commit a1f20a92a0
10 changed files with 617 additions and 227 deletions
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1
src/mint/Makefile.am
View File

@ -63,6 +63,7 @@ taler_mint_httpd_SOURCES = \
taler-mint-httpd.c \
taler-mint-httpd_parsing.c taler-mint-httpd_parsing.h \
taler-mint-httpd_responses.c taler-mint-httpd_responses.h \
taler-mint-httpd_db.c taler-mint-httpd_db.h \
taler-mint-httpd_mhd.c \
taler-mint-httpd_keys.c \
taler-mint-httpd_deposit.c \

1
src/mint/mint_db.c
View File

@ -22,6 +22,7 @@
#include "platform.h"
#include "taler_db_lib.h"
#include "taler_signatures.h"
#include "taler-mint-httpd_responses.h"
#include "mint_db.h"
#include "mint.h"
#include <pthread.h>

24
src/mint/mint_db.h
View File

@ -24,10 +24,11 @@
#define _NEURO_MINT_DB_H
#include <libpq-fe.h>
#include <microhttpd.h>
#include <gnunet/gnunet_util_lib.h>
#include "taler_util.h"
#include "taler_rsa.h"
#include "taler-mint-httpd_db.h"
/**
* Public information about a coin.
@ -172,26 +173,6 @@ struct KnownCoin
struct GNUNET_CRYPTO_EddsaPublicKey refresh_session_pub;
};
GNUNET_NETWORK_STRUCT_BEGIN
struct Deposit
{
/* FIXME: should be TALER_CoinPublicInfo */
struct GNUNET_CRYPTO_EddsaPublicKey coin_pub;
struct TALER_RSA_PublicKeyBinaryEncoded denom_pub;
struct TALER_RSA_Signature coin_sig;
struct TALER_RSA_SignaturePurpose purpose;
uint64_t transaction_id;
struct TALER_AmountNBO amount;
struct GNUNET_CRYPTO_EddsaPublicKey merchant_pub;
struct GNUNET_HashCode h_contract;
struct GNUNET_HashCode h_wire;
/* TODO: uint16_t wire_size */
char wire[]; /* string encoded wire JSON object */
};
GNUNET_NETWORK_STRUCT_END
int
TALER_MINT_DB_prepare (PGconn *db_conn);
@ -350,7 +331,6 @@ TALER_MINT_DB_insert_known_coin (PGconn *db_conn,
const struct KnownCoin *known_coin);
/**
* Get the thread-local database-handle.
* Connect to the db if the connection does not exist yet.

129
src/mint/taler-mint-httpd_db.c Normal file
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@ -0,0 +1,129 @@
/*
This file is part of TALER
(C) 2014 Christian Grothoff (and other contributing authors)
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, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file taler-mint-httpd_db.c
* @brief Database access abstraction for the mint.
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler-mint-httpd_db.h"
#include "taler_signatures.h"
#include "taler-mint-httpd_responses.h"
#include "mint_db.h"
#include "mint.h"
#include <pthread.h>
/**
* Execute a deposit. The validity of the coin and signature
* have already been checked. The database must now check that
* the coin is not (double or over) spent, and execute the
* transaction (record details, generate success or failure response).
*
* @param connection the MHD connection to handle
* @param deposit information about the deposit
* @return MHD result code
*/
int
TALER_MINT_db_execute_deposit (struct MHD_Connection *connection,
const struct Deposit *deposit)
{
PGconn *db_conn;
if (NULL == (db_conn = TALER_MINT_DB_get_connection ()))
{
GNUNET_break (0);
return TALER_MINT_reply_internal_error (connection,
"Failed to connect to database\n");
}
{
struct Deposit *existing_deposit;
int res;
res = TALER_MINT_DB_get_deposit (db_conn,
&deposit->coin_pub,
&existing_deposit);
if (GNUNET_YES == res)
{
// FIXME: memory leak
if (0 == memcmp (existing_deposit, deposit, sizeof (struct Deposit)))
return TALER_MINT_reply_deposit_success (connection, deposit);
// FIXME: in the future, check if there's enough credits
// left on the coin. For now: refuse
// FIXME: return more information here
return TALER_MINT_reply_json_pack (connection,
MHD_HTTP_FORBIDDEN,
"{s:s}",
"error",
"double spending");
}
if (GNUNET_SYSERR == res)
{
GNUNET_break (0);
/* FIXME: return error message to client via MHD! */
return MHD_NO;
}
}
{
struct KnownCoin known_coin;
int res;
struct TALER_CoinPublicInfo coin_info;
res = TALER_MINT_DB_get_known_coin (db_conn, &coin_info.coin_pub, &known_coin);
if (GNUNET_YES == res)
{
// coin must have been refreshed
// FIXME: check
// FIXME: return more information here
return TALER_MINT_reply_json_pack (connection,
MHD_HTTP_FORBIDDEN,
"{s:s}",
"error", "coin was refreshed");
}
if (GNUNET_SYSERR == res)
{
GNUNET_break (0);
/* FIXME: return error message to client via MHD! */
return MHD_NO;
}
/* coin valid but not known => insert into DB */
known_coin.is_refreshed = GNUNET_NO;
known_coin.expended_balance = TALER_amount_ntoh (deposit->amount);
known_coin.public_info = coin_info;
if (GNUNET_OK != TALER_MINT_DB_insert_known_coin (db_conn, &known_coin))
{
GNUNET_break (0);
/* FIXME: return error message to client via MHD! */
return MHD_NO;
}
}
if (GNUNET_OK != TALER_MINT_DB_insert_deposit (db_conn, deposit))
{
GNUNET_break (0);
/* FIXME: return error message to client via MHD! */
return MHD_NO;
}
// FIXME: check commit return value!
TALER_MINT_DB_commit (db_conn);
return TALER_MINT_reply_deposit_success (connection, deposit);
}

79
src/mint/taler-mint-httpd_db.h Normal file
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@ -0,0 +1,79 @@
/*
This file is part of TALER
(C) 2014 Christian Grothoff (and other contributing authors)
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, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file mint/taler-mint_httpd_db.h
* @brief Mint-specific database access
* @author Chrisitan Grothoff
*/
#ifndef TALER_MINT_HTTPD_DB_H
#define TALER_MINT_HTTPD_DB_H
#include <libpq-fe.h>
#include <microhttpd.h>
#include <gnunet/gnunet_util_lib.h>
#include "taler_util.h"
#include "taler_rsa.h"
GNUNET_NETWORK_STRUCT_BEGIN
/**
* Specification for a /deposit operation.
*/
struct Deposit
{
/* FIXME: should be TALER_CoinPublicInfo */
struct GNUNET_CRYPTO_EddsaPublicKey coin_pub;
struct TALER_RSA_PublicKeyBinaryEncoded denom_pub;
struct TALER_RSA_Signature coin_sig;
struct TALER_RSA_Signature ubsig;
/**
* Type of the deposit (also purpose of the signature). Either
* #TALER_SIGNATURE_DEPOSIT or #TALER_SIGNATURE_INCREMENTAL_DEPOSIT.
*/
struct TALER_RSA_SignaturePurpose purpose;
uint64_t transaction_id;
struct TALER_AmountNBO amount;
struct GNUNET_CRYPTO_EddsaPublicKey merchant_pub;
struct GNUNET_HashCode h_contract;
struct GNUNET_HashCode h_wire;
/* TODO: uint16_t wire_size */
char wire[]; /* string encoded wire JSON object */
};
GNUNET_NETWORK_STRUCT_END
/**
* Execute a deposit. The validity of the coin and signature
* have already been checked. The database must now check that
* the coin is not (double or over) spent, and execute the
* transaction (record details, generate success or failure response).
*
* @param connection the MHD connection to handle
* @param deposit information about the deposit
* @return MHD result code
*/
int
TALER_MINT_db_execute_deposit (struct MHD_Connection *connection,
const struct Deposit *deposit);
#endif /* _NEURO_MINT_DB_H */

327
src/mint/taler-mint-httpd_deposit.c
View File

@ -15,7 +15,9 @@
*/
/**
* @file taler-mint-httpd_deposit.c
* @brief Handle /deposit requests
* @brief Handle /deposit requests; parses the POST and JSON and
* verifies the coin signature before handing things off
* to the database.
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
@ -33,33 +35,140 @@
#include "taler_json_lib.h"
#include "taler-mint-httpd_parsing.h"
#include "taler-mint-httpd_keys.h"
#include "taler-mint-httpd_db.h"
#include "taler-mint-httpd_deposit.h"
#include "taler-mint-httpd_responses.h"
/**
* Send confirmation of deposit success to client.
* We have parsed the JSON information about the deposit, do some
* basic sanity checks (especially that the signature on the coin is
* valid, and that this type of coin exists) and then execute the
* deposit.
*
* @param connection connection to the client
* @param deposit deposit request to confirm
* @param connection the MHD connection to handle
* @param deposit information about the deposit
* @return MHD result code
*/
// FIXME: this should be in taler-mint-httpd_responses.c
static int
helper_deposit_send_response_success (struct MHD_Connection *connection,
struct Deposit *deposit)
verify_and_execute_deposit (struct MHD_Connection *connection,
const struct Deposit *deposit)
{
// FIXME: return more information here
struct MintKeyState *key_state;
struct TALER_CoinPublicInfo coin_info;
memcpy (&coin_info.coin_pub,
&deposit->coin_pub,
sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
coin_info.denom_pub = deposit->denom_pub;
coin_info.denom_sig = deposit->ubsig;
key_state = TALER_MINT_key_state_acquire ();
if (GNUNET_YES !=
TALER_MINT_test_coin_valid (key_state,
&coin_info))
{
TALER_MINT_key_state_release (key_state);
return TALER_MINT_reply_json_pack (connection,
MHD_HTTP_OK,
MHD_HTTP_NOT_FOUND,
"{s:s}",
"status",
"DEPOSIT_OK");
"error", "Coin is not valid");
}
TALER_MINT_key_state_release (key_state);
/* FIXME: verify coin signature! */
/*
if (GNUNET_OK != GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_DEPOSIT,
&deposit->purpose,
&deposit->coin_sig,
&deposit->coin_pub))
{
resp = json_pack ("{s:s}", "error", "Signature verfication failed");
resp_code = MHD_HTTP_NOT_FOUND;
goto EXITIF_exit;
}
*/
return TALER_MINT_db_execute_deposit (connection,
deposit);
}
/**
* Handle a "/deposit" request
* Handle a "/deposit" request. This function parses the
* JSON information and then calls #verify_and_execute_deposit()
* to verify the data and execute the deposit.
*
* @param connection the MHD connection to handle
* @param root root of the posted JSON
* @param purpose is this a #TALER_SIGNATURE_DEPOSIT or
* #TALER_SIGNATURE_INCREMENTAL_DEPOSIT
* @param wire json describing the wire details (?)
* @return MHD result code
*/
static int
parse_and_handle_deposit_request (struct MHD_Connection *connection,
const json_t *root,
uint32_t purpose,
const json_t *wire)
{
struct Deposit *deposit;
char *wire_enc;
size_t len;
int res;
// FIXME: `struct Deposit` is clearly ill-defined, we should
// not have to do this...
if (NULL == (wire_enc = json_dumps (wire, JSON_COMPACT | JSON_SORT_KEYS)))
{
GNUNET_break_op (0);
return TALER_MINT_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{s:s}",
"error", "Bad format");
}
len = strlen (wire_enc) + 1;
GNUNET_free (wire_enc);
deposit = GNUNET_malloc (sizeof (struct Deposit) + len);
{
struct GNUNET_MINT_ParseFieldSpec spec[] =
{
TALER_MINT_PARSE_FIXED ("coin_pub", &deposit->coin_pub),
TALER_MINT_PARSE_FIXED ("denom_pub", &deposit->denom_pub),
TALER_MINT_PARSE_FIXED ("ubsig", &deposit->ubsig),
TALER_MINT_PARSE_FIXED ("merchant_pub", &deposit->merchant_pub),
TALER_MINT_PARSE_FIXED ("H_a", &deposit->h_contract),
TALER_MINT_PARSE_FIXED ("H_wire", &deposit->h_wire),
TALER_MINT_PARSE_FIXED ("csig", &deposit->coin_sig),
TALER_MINT_PARSE_FIXED ("transaction_id", &deposit->transaction_id),
TALER_MINT_PARSE_END
};
res = TALER_MINT_parse_json_data (connection,
wire, /* FIXME: wire or root here? */
spec);
if (GNUNET_SYSERR == res)
return MHD_NO; /* hard failure */
if (GNUNET_NO == res)
return MHD_YES; /* failure */
deposit->purpose.purpose = htonl (purpose);
deposit->purpose.size = htonl (sizeof (struct Deposit)
- offsetof (struct Deposit, purpose));
res = verify_and_execute_deposit (connection,
deposit);
TALER_MINT_release_parsed_data (spec);
}
GNUNET_free (deposit);
return res;
}
/**
* Handle a "/deposit" request. Parses the JSON in the post and, if
* successful, passes the JSON data to
* #parse_and_handle_deposit_request().
*
* @param rh context of the handler
* @param connection the MHD connection to handle
@ -76,18 +185,10 @@ TALER_MINT_handler_deposit (struct RequestHandler *rh,
size_t *upload_data_size)
{
json_t *json;
struct Deposit *deposit;
json_t *wire;
json_t *resp;
char *wire_enc = NULL;
const char *deposit_type;
struct MintKeyState *key_state;
struct TALER_CoinPublicInfo coin_info;
struct TALER_RSA_Signature ubsig;
size_t len;
int resp_code;
PGconn *db_conn;
int res;
uint32_t purpose;
res = TALER_MINT_parse_post_json (connection,
connection_cls,
@ -98,187 +199,37 @@ TALER_MINT_handler_deposit (struct RequestHandler *rh,
return MHD_NO;
if ( (GNUNET_NO == res) || (NULL == json) )
return MHD_YES;
if (NULL == (db_conn = TALER_MINT_DB_get_connection ()))
{
/* FIXME: return error message to client via MHD! */
GNUNET_break (0);
return MHD_NO;
}
deposit = NULL;
wire = NULL;
resp = NULL;
if (-1 == json_unpack (json,
"{s:s, s:o}",
"type", &deposit_type,
"wire", &wire))
{
GNUNET_break_op (0);
resp = json_pack ("{s:s}", "error", "Bad format");
resp_code = MHD_HTTP_BAD_REQUEST;
goto EXITIF_exit;
return TALER_MINT_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{s:s}",
"error", "Bad format");
}
if (NULL == (wire_enc = json_dumps (wire, JSON_COMPACT | JSON_SORT_KEYS)))
{
GNUNET_break_op (0);
resp = json_pack ("{s:s}", "error", "Bad format");
resp_code = MHD_HTTP_BAD_REQUEST;
goto EXITIF_exit;
}
len = strlen (wire_enc) + 1;
deposit = GNUNET_malloc (sizeof (struct Deposit) + len);
#define EXITIF(cond) \
do { \
if (cond) { GNUNET_break (0); goto EXITIF_exit; } \
} while (0)
// FIXME: need to distinguish between _OK and _NO return values here,
// and never try to queue our own!
#define PARSE_DATA(field, addr) \
EXITIF (GNUNET_OK != \
GNUNET_MINT_parse_navigate_json \
(connection, json, \
JNAV_FIELD, field, JNAV_RET_DATA, addr, sizeof (*addr)))
PARSE_DATA ("coin_pub", &deposit->coin_pub);
PARSE_DATA ("denom_pub", &deposit->denom_pub);
PARSE_DATA ("ubsig", &ubsig);
PARSE_DATA ("merchant_pub", &deposit->merchant_pub);
PARSE_DATA ("H_a", &deposit->h_contract);
PARSE_DATA ("H_wire", &deposit->h_wire);
PARSE_DATA ("csig", &deposit->coin_sig);
PARSE_DATA ("transaction_id", &deposit->transaction_id);
#undef PARSE_DATA
if (0 == strcmp ("DIRECT_DEPOSIT", deposit_type))
deposit->purpose.purpose = htonl (TALER_SIGNATURE_DEPOSIT);
purpose = TALER_SIGNATURE_DEPOSIT;
else if (0 == strcmp ("INCREMENTAL_DEPOSIT", deposit_type))
deposit->purpose.purpose = htonl (TALER_SIGNATURE_INCREMENTAL_DEPOSIT);
purpose = TALER_SIGNATURE_INCREMENTAL_DEPOSIT;
else
{
GNUNET_break_op (0);
resp = json_pack ("{s:s}", "error", "Bad format");
resp_code = MHD_HTTP_BAD_REQUEST;
goto EXITIF_exit;
}
deposit->purpose.size = htonl (sizeof (struct Deposit)
- offsetof (struct Deposit, purpose));
memcpy (&coin_info.coin_pub,
&deposit->coin_pub,
sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
coin_info.denom_pub = deposit->denom_pub;
coin_info.denom_sig = ubsig;
key_state = TALER_MINT_key_state_acquire ();
if (GNUNET_YES != TALER_MINT_test_coin_valid (key_state,
&coin_info))
{
TALER_MINT_key_state_release (key_state);
resp = json_pack ("{s:s}", "error", "Coin is not valid");
resp_code = MHD_HTTP_NOT_FOUND;
goto EXITIF_exit;
}
TALER_MINT_key_state_release (key_state);
/*
if (GNUNET_OK != GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_DEPOSIT,
&deposit->purpose,
&deposit->coin_sig,
&deposit->coin_pub))
{
resp = json_pack ("{s:s}", "error", "Signature verfication failed");
resp_code = MHD_HTTP_NOT_FOUND;
goto EXITIF_exit;
}
*/
/* Check if we already received the same deposit permission,
* or the coin was already deposited */
{
struct Deposit *existing_deposit;
int res;
res = TALER_MINT_DB_get_deposit (db_conn,
&deposit->coin_pub,
&existing_deposit);
if (GNUNET_YES == res)
{
// FIXME: memory leak
if (0 == memcmp (existing_deposit, deposit, sizeof (struct Deposit)))
return helper_deposit_send_response_success (connection, deposit);
// FIXME: in the future, check if there's enough credits
// left on the coin. For now: refuse
// FIXME: return more information here
return TALER_MINT_reply_json_pack (connection,
MHD_HTTP_FORBIDDEN,
"{s:s}",
"error",
"double spending");
}
if (GNUNET_SYSERR == res)
{
GNUNET_break (0);
/* FIXME: return error message to client via MHD! */
return MHD_NO;
}
}
{
struct KnownCoin known_coin;
int res;
res = TALER_MINT_DB_get_known_coin (db_conn, &coin_info.coin_pub, &known_coin);
if (GNUNET_YES == res)
{
// coin must have been refreshed
// FIXME: check
// FIXME: return more information here
return TALER_MINT_reply_json_pack (connection,
MHD_HTTP_FORBIDDEN,
"{s:s}",
"error", "coin was refreshed");
}
if (GNUNET_SYSERR == res)
{
GNUNET_break (0);
/* FIXME: return error message to client via MHD! */
return MHD_NO;
}
/* coin valid but not known => insert into DB */
known_coin.is_refreshed = GNUNET_NO;
known_coin.expended_balance = TALER_amount_ntoh (deposit->amount);
known_coin.public_info = coin_info;
if (GNUNET_OK != TALER_MINT_DB_insert_known_coin (db_conn, &known_coin))
{
GNUNET_break (0);
/* FIXME: return error message to client via MHD! */
return MHD_NO;
}
}
if (GNUNET_OK != TALER_MINT_DB_insert_deposit (db_conn, deposit))
{
GNUNET_break (0);
/* FIXME: return error message to client via MHD! */
return MHD_NO;
}
return helper_deposit_send_response_success (connection, deposit);
EXITIF_exit:
if (NULL != resp)
res = TALER_MINT_reply_json (connection,
resp,
resp_code);
else
res = MHD_NO;
if (NULL != wire)
json_decref (wire);
if (NULL != deposit)
GNUNET_free (deposit);
if (NULL != wire_enc)
GNUNET_free (wire_enc);
return TALER_MINT_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{s:s}",
"error", "Bad format");
}
res = parse_and_handle_deposit_request (connection,
json,
purpose,
wire);
json_decref (wire);
return res;
#undef EXITIF
#undef PARSE_DATA
}
/* end of taler-mint-httpd_deposit.c */

149
src/mint/taler-mint-httpd_parsing.c
View File

@ -269,9 +269,10 @@ TALER_MINT_parse_post_cleanup_callback (void *con_cls)
* @param connection the connection to send an error response to
* @param root the JSON node to start the navigation at.
* @param ... navigation specification (see `enum TALER_MINT_JsonNavigationCommand`)
* @return GNUNET_YES if navigation was successful
* GNUNET_NO if json is malformed, error response was generated
* GNUNET_SYSERR on internal error (no response was generated,
* @return
* #GNUNET_YES if navigation was successful
* #GNUNET_NO if json is malformed, error response was generated
* #GNUNET_SYSERR on internal error (no response was generated,
* connection must be closed)
*/
int
@ -461,6 +462,142 @@ GNUNET_MINT_parse_navigate_json (struct MHD_Connection *connection,
}
/**
* Find a fixed-size field in the top-level of the JSON tree and store
* it in @a data.
*
* Sends an error response if navigation is impossible (i.e.
* the JSON object is invalid)
*
* @param connection the connection to send an error response to
* @param root the JSON node to start the navigation at.
* @param field name of the field to navigate to
* @param data where to store the extracted data
* @param data_size size of the @a data field
* @param[IN|OUT] ret return value, function does nothing if @a ret is not #GNUNET_YES
* on entry; will set @a ret to:
* #GNUNET_YES if navigation was successful
* #GNUNET_NO if json is malformed, error response was generated
* #GNUNET_SYSERR on internal error
*/
static void
parse_fixed_json_data (struct MHD_Connection *connection,
const json_t *root,
const char *field,
void *data,
size_t data_size,
int *ret)
{
if (GNUNET_YES != *ret)
return;
*ret = GNUNET_MINT_parse_navigate_json (connection,
root,
JNAV_FIELD, field,
JNAV_RET_DATA, data, data_size);
}
/**
* Find a variable-size field in the top-level of the JSON tree and store
* it in @a data.
*
* Sends an error response if navigation is impossible (i.e.
* the JSON object is invalid)
*
* @param connection the connection to send an error response to
* @param root the JSON node to start the navigation at.
* @param field name of the field to navigate to
* @param data where to store a pointer to memory allocated for the extracted data
* @param[IN|OUT] ret return value, function does nothing if @a ret is not #GNUNET_YES
* on entry; will set @a ret to:
* #GNUNET_YES if navigation was successful
* #GNUNET_NO if json is malformed, error response was generated
* #GNUNET_SYSERR on internal error
*/
static void
parse_variable_json_data (struct MHD_Connection *connection,
const json_t *root,
const char *field,
void **data,
size_t *data_size,
int *ret)
{
if (GNUNET_YES != *ret)
return;
*ret = GNUNET_MINT_parse_navigate_json (connection,
root,
JNAV_FIELD, field,
JNAV_RET_DATA_VAR, data, data_size);
}
/**
* Parse JSON object into components based on the given field
* specification.
*
* @param connection the connection to send an error response to
* @param root the JSON node to start the navigation at.
* @param spec field specification for the parser
* @return
* #GNUNET_YES if navigation was successful (caller is responsible
* for freeing allocated variable-size data using
* #TALER_MINT_release_parsed_data() when done)
* #GNUNET_NO if json is malformed, error response was generated
* #GNUNET_SYSERR on internal error
*/
int
TALER_MINT_parse_json_data (struct MHD_Connection *connection,
const json_t *root,
struct GNUNET_MINT_ParseFieldSpec *spec)
{
unsigned int i;
int ret;
ret = GNUNET_YES;
for (i=0; NULL != spec[i].field_name; i++)
{
if (0 == spec[i].destination_size_in)
parse_variable_json_data (connection, root,
spec[i].field_name,
(void **) spec[i].destination,
&spec[i].destination_size_out,
&ret);
else
parse_fixed_json_data (connection, root,
spec[i].field_name,
spec[i].destination,
spec[i].destination_size_in,
&ret);
}
if (GNUNET_YES != ret)
TALER_MINT_release_parsed_data (spec);
return ret;
}
/**
* Release all memory allocated for the variable-size fields in
* the parser specification.
*
* @param spec specification to free
*/
void
TALER_MINT_release_parsed_data (struct GNUNET_MINT_ParseFieldSpec *spec)
{
unsigned int i;
for (i=0; NULL != spec[i].field_name; i++)
if ( (0 == spec[i].destination_size_in) &&
(0 != spec[i].destination_size_out) )
{
GNUNET_free (spec[i].destination);
spec[i].destination = NULL;
spec[i].destination_size_out = 0;
}
}
/**
* Extract base32crockford encoded data from request.
*
@ -472,9 +609,9 @@ GNUNET_MINT_parse_navigate_json (struct MHD_Connection *connection,
* @param[out] out_data pointer to store the result
* @param out_size expected size of data
* @return
* GNUNET_YES if the the argument is present
* GNUNET_NO if the argument is absent or malformed
* GNUNET_SYSERR on internal error (error response could not be sent)
* #GNUNET_YES if the the argument is present
* #GNUNET_NO if the argument is absent or malformed
* #GNUNET_SYSERR on internal error (error response could not be sent)
*/
int
TALER_MINT_mhd_request_arg_data (struct MHD_Connection *connection,

96
src/mint/taler-mint-httpd_parsing.h
View File

@ -123,9 +123,10 @@ enum TALER_MINT_JsonNavigationCommand
* @param connection the connection to send an error response to
* @param root the JSON node to start the navigation at.
* @param ... navigation specification (see `enum TALER_MINT_JsonNavigationCommand`)
* @return GNUNET_YES if navigation was successful
* GNUNET_NO if json is malformed, error response was generated
* GNUNET_SYSERR on internal error
* @return
* #GNUNET_YES if navigation was successful
* #GNUNET_NO if json is malformed, error response was generated
* #GNUNET_SYSERR on internal error
*/
int
GNUNET_MINT_parse_navigate_json (struct MHD_Connection *connection,
@ -133,6 +134,89 @@ GNUNET_MINT_parse_navigate_json (struct MHD_Connection *connection,
...);
/**
* Specification for how to parse a JSON field.
*/
struct GNUNET_MINT_ParseFieldSpec
{
/**
* Name of the field. NULL only to terminate array.
*/
const char *field_name;
/**
* Where to store the result. Must have exactly
* @e destination_size bytes, except if @e destination_size is zero.
* NULL to skip assignment (but check presence of the value).
*/
void *destination;
/**
* How big should the result be, 0 for variable size. In
* this case, @e destination must be a "void **", pointing
* to a location that is currently NULL and is to be allocated.
*/
size_t destination_size_in;
/**
* @e destination_size_out will then be set to the size of the
* value that was stored in @e destination (useful for
* variable-size allocations).
*/
size_t destination_size_out;
};
/**
* Parse JSON object into components based on the given field
* specification.
*
* @param connection the connection to send an error response to
* @param root the JSON node to start the navigation at.
* @param spec field specification for the parser
* @return
* #GNUNET_YES if navigation was successful (caller is responsible
* for freeing allocated variable-size data using
* #TALER_MINT_release_parsed_data() when done)
* #GNUNET_NO if json is malformed, error response was generated
* #GNUNET_SYSERR on internal error
*/
int
TALER_MINT_parse_json_data (struct MHD_Connection *connection,
const json_t *root,
struct GNUNET_MINT_ParseFieldSpec *spec);
/**
* Release all memory allocated for the variable-size fields in
* the parser specification.
*
* @param spec specification to free
*/
void
TALER_MINT_release_parsed_data (struct GNUNET_MINT_ParseFieldSpec *spec);
/**
* Generate line in parser specification for fixed-size value.
*
* @param field name of the field
* @param value where to store the value
*/
#define TALER_MINT_PARSE_FIXED(field,value) { field, value, sizeof (*value), 0 }
/**
* Generate line in parser specification for variable-size value.
*
* @param field name of the field
* @param value where to store the value
*/
#define TALER_MINT_PARSE_VARIABLE(field,value) { field, &value, 0, 0 }
/**
* Generate line in parser specification indicating the end of the spec.
*/
#define TALER_MINT_PARSE_END { NULL, NULL, 0, 0 }
/**
@ -146,9 +230,9 @@ GNUNET_MINT_parse_navigate_json (struct MHD_Connection *connection,
* @param[out] out_data pointer to store the result
* @param out_size expected size of @a out_data
* @return
* GNUNET_YES if the the argument is present
* GNUNET_NO if the argument is absent or malformed
* GNUNET_SYSERR on internal error (error response could not be sent)
* #GNUNET_YES if the the argument is present
* #GNUNET_NO if the argument is absent or malformed
* #GNUNET_SYSERR on internal error (error response could not be sent)
*/
int
TALER_MINT_mhd_request_arg_data (struct MHD_Connection *connection,

23
src/mint/taler-mint-httpd_responses.c
View File

@ -204,8 +204,25 @@ TALER_MINT_reply_invalid_json (struct MHD_Connection *connection)
}
/**
* Send confirmation of deposit success to client.
*
* @param connection connection to the client
* @param deposit deposit request to confirm
* @return MHD result code
*/
int
TALER_MINT_reply_deposit_success (struct MHD_Connection *connection,
const struct Deposit *deposit)
{
// FIXME: return more information here,
// including in particular a signature over
// the deposit data from the mint!
return TALER_MINT_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:s}",
"status",
"DEPOSIT_OK");
}
/* end of taler-mint-httpd_responses.c */

11
src/mint/taler-mint-httpd_responses.h
View File

@ -32,6 +32,7 @@
#include <pthread.h>
#include "taler-mint-httpd.h"
#include "taler-mint-httpd_mhd.h"
#include "mint_db.h"
/**
@ -122,6 +123,16 @@ int
TALER_MINT_reply_invalid_json (struct MHD_Connection *connection);
/**
* Send confirmation of deposit success to client.
*
* @param connection connection to the client
* @param deposit deposit request to confirm
* @return MHD result code
*/
int
TALER_MINT_reply_deposit_success (struct MHD_Connection *connection,
const struct Deposit *deposit);