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Diffstat (limited to 'src/exchange/taler-exchange-httpd_responses.c')
| -rw-r--r-- | src/exchange/taler-exchange-httpd_responses.c | 1177 |
1 files changed, 1177 insertions, 0 deletions
diff --git a/src/exchange/taler-exchange-httpd_responses.c b/src/exchange/taler-exchange-httpd_responses.c new file mode 100644 index 000000000..d6cf81bb7 --- /dev/null +++ b/src/exchange/taler-exchange-httpd_responses.c @@ -0,0 +1,1177 @@ +/* + This file is part of TALER + Copyright (C) 2014, 2015, 2016 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, If not, see <http://www.gnu.org/licenses/> +*/ +/** + * @file taler-exchange-httpd_responses.c + * @brief API for generating the various replies of the exchange; these + * functions are called TMH_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 <gnunet/gnunet_util_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 +TMH_RESPONSE_add_global_headers (struct MHD_Response *response) +{ + if (TMH_exchange_connection_close) + (void) 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 +TMH_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; + } + TMH_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 +TMH_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 = TMH_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 +TMH_RESPONSE_reply_arg_invalid (struct MHD_Connection *connection, + const char *param_name) +{ + return TMH_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 +TMH_RESPONSE_reply_arg_unknown (struct MHD_Connection *connection, + const char *param_name) +{ + return TMH_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 +TMH_RESPONSE_reply_signature_invalid (struct MHD_Connection *connection, + const char *param_name) +{ + return TMH_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 +TMH_RESPONSE_reply_arg_missing (struct MHD_Connection *connection, + const char *param_name) +{ + return TMH_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 +TMH_RESPONSE_reply_permission_denied (struct MHD_Connection *connection, + const char *hint) +{ + return TMH_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 +TMH_RESPONSE_reply_internal_error (struct MHD_Connection *connection, + const char *hint) +{ + return TMH_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 +TMH_RESPONSE_reply_external_error (struct MHD_Connection *connection, + const char *hint) +{ + return TMH_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 +TMH_RESPONSE_reply_commit_error (struct MHD_Connection *connection) +{ + return TMH_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 +TMH_RESPONSE_reply_internal_db_error (struct MHD_Connection *connection) +{ + return TMH_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 +TMH_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; + TMH_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 +TMH_RESPONSE_reply_invalid_json (struct MHD_Connection *connection) +{ + return TMH_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 +TMH_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; + TMH_KS_sign (&dc.purpose, + &pub, + &sig); + return TMH_RESPONSE_reply_json_pack (connection, + MHD_HTTP_OK, + "{s:s, s:o, s:o}", + "status", "DEPOSIT_OK", + "sig", TALER_json_from_data (&sig, + sizeof (sig)), + "pub", TALER_json_from_data (&pub, + sizeof (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 TALER_CoinSpendSignatureP *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; + /* 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->eddsa_signature, + &deposit->coin.coin_pub.eddsa_pub)) + { + GNUNET_break (0); + json_decref (history); + return NULL; + } + + details = TALER_json_from_data (&dr.purpose, + sizeof (struct TALER_DepositRequestPS)); + 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; + /* 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->eddsa_signature, + &melt->coin.coin_pub.eddsa_pub)) + { + GNUNET_break (0); + json_decref (history); + return NULL; + } + + details = TALER_json_from_data (&ms.purpose, + sizeof (struct TALER_RefreshMeltCoinAffirmationPS)); + } + break; + default: + 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", TALER_json_from_data (sig, + sizeof (struct TALER_CoinSpendSignatureP)), + "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 +TMH_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 TMH_RESPONSE_reply_internal_db_error (connection); + return TMH_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; + json_array_append_new (json_history, + json_pack ("{s:s, s:O, s:o}", + "type", "DEPOSIT", + "wire", pos->details.bank->wire, + "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; + json_array_append_new (json_history, + json_pack ("{s:s, s:o, s:o, s:o}", + "type", "WITHDRAW", + "signature", TALER_json_from_data (&pos->details.withdraw->reserve_sig, + sizeof (struct TALER_ReserveSignatureP)), + "details", TALER_json_from_data (&wr, + sizeof (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; +} + + +/** + * Send reserve status information to client. + * + * @param connection connection to the client + * @param rh reserve history to return + * @return MHD result code + */ +int +TMH_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 TMH_RESPONSE_reply_internal_error (connection, + "balance calculation failure"); + json_balance = TALER_json_from_amount (&balance); + return TMH_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 +TMH_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 TMH_RESPONSE_reply_internal_error (connection, + "balance calculation failure"); + json_balance = TALER_json_from_amount (&balance); + return TMH_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 +TMH_RESPONSE_reply_reserve_withdraw_success (struct MHD_Connection *connection, + const struct TALER_EXCHANGEDB_CollectableBlindcoin *collectable) +{ + json_t *sig_json; + + sig_json = TALER_json_from_rsa_signature (collectable->sig.rsa_signature); + return TMH_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 +TMH_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 TMH_RESPONSE_reply_internal_db_error (connection); + return TMH_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", + TALER_json_from_data (coin_pub, + sizeof (struct TALER_CoinSpendPublicKeyP)), + "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 +TMH_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); + TMH_KS_sign (&body.purpose, + &pub, + &sig); + sig_json = TALER_json_from_data (&sig, + sizeof (sig)); + GNUNET_assert (NULL != sig_json); + return TMH_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", TALER_json_from_data (&pub, + sizeof (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 +TMH_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", + TALER_json_from_rsa_signature (sigs[newcoin_index].rsa_signature)); + json_array_append_new (list, + obj); + } + root = json_object (); + json_object_set_new (root, + "ev_sigs", + list); + ret = TMH_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 mc all information about the original commitment + * @param off offset in the array of kappa-commitments where + * the missmatch was detected + * @param j index of the coin for which the missmatch was + * detected + * @param missmatch_object name of the object that was + * bogus (i.e. "transfer key"). + * @return a MHD result code + */ +int +TMH_RESPONSE_reply_refresh_reveal_missmatch (struct MHD_Connection *connection, + const struct TALER_EXCHANGEDB_MeltCommitment *mc, + unsigned int off, + unsigned int j, + const char *missmatch_object) +{ + json_t *info_old; + json_t *info_new; + json_t *info_commit; + json_t *info_links; + unsigned int i; + unsigned int k; + + info_old = json_array (); + for (i=0;i<mc->num_oldcoins;i++) + { + const struct TALER_EXCHANGEDB_RefreshMelt *rm; + json_t *rm_json; + + rm = &mc->melts[i]; + rm_json = json_object (); + json_object_set_new (rm_json, + "coin_sig", + TALER_json_from_data (&rm->coin_sig, + sizeof (struct TALER_CoinSpendSignatureP))); + json_object_set_new (rm_json, + "coin_pub", + TALER_json_from_data (&rm->coin.coin_pub, + sizeof (struct TALER_CoinSpendPublicKeyP))); + json_object_set_new (rm_json, + "melt_amount_with_fee", + TALER_json_from_amount (&rm->amount_with_fee)); + json_object_set_new (rm_json, + "melt_fee", + TALER_json_from_amount (&rm->melt_fee)); + json_array_append_new (info_old, + rm_json); + } + info_new = json_array (); + for (i=0;i<mc->num_newcoins;i++) + { + const struct TALER_DenominationPublicKey *pk; + + pk = &mc->denom_pubs[i]; + json_array_append_new (info_new, + TALER_json_from_rsa_public_key (pk->rsa_public_key)); + + } + info_commit = json_array (); + info_links = json_array (); + for (k=0;k<TALER_CNC_KAPPA;k++) + { + json_t *info_commit_k; + json_t *info_link_k; + + info_commit_k = json_array (); + for (i=0;i<mc->num_newcoins;i++) + { + const struct TALER_EXCHANGEDB_RefreshCommitCoin *cc; + json_t *cc_json; + + cc = &mc->commit_coins[k][i]; + cc_json = json_object (); + json_object_set_new (cc_json, + "coin_ev", + TALER_json_from_data (cc->coin_ev, + cc->coin_ev_size)); + json_object_set_new (cc_json, + "coin_priv_enc", + TALER_json_from_data (cc->refresh_link->coin_priv_enc, + sizeof (struct TALER_CoinSpendPrivateKeyP))); + json_object_set_new (cc_json, + "blinding_key_enc", + TALER_json_from_data (cc->refresh_link->blinding_key_enc, + cc->refresh_link->blinding_key_enc_size)); + + json_array_append_new (info_commit_k, + cc_json); + } + json_array_append_new (info_commit, + info_commit_k); + info_link_k = json_array (); + for (i=0;i<mc->num_oldcoins;i++) + { + const struct TALER_RefreshCommitLinkP *cl; + json_t *cl_json; + + cl = &mc->commit_links[k][i]; + cl_json = json_object (); + json_object_set_new (cl_json, + "transfer_pub", + TALER_json_from_data (&cl->transfer_pub, + sizeof (struct TALER_TransferPublicKeyP))); + json_object_set_new (cl_json, + "shared_secret_enc", + TALER_json_from_data (&cl->shared_secret_enc, + sizeof (struct TALER_EncryptedLinkSecretP))); + json_array_append_new (info_link_k, + cl_json); + } + json_array_append_new (info_links, + info_link_k); + } + return TMH_RESPONSE_reply_json_pack (connection, + MHD_HTTP_CONFLICT, + "{s:s, s:i, s:i, s:o, s:o, s:o, s:o, s:s}", + "error", "commitment violation", + "offset", (int) off, + "index", (int) j, + "oldcoin_infos", info_old, + "newcoin_infos", info_new, + "commit_infos", info_commit, + "link_infos", info_links, + "object", missmatch_object); +} + + +/** + * 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 +TMH_RESPONSE_reply_refresh_link_success (struct MHD_Connection *connection, + unsigned int num_sessions, + const struct TMH_RESPONSE_LinkSessionInfo *sessions) +{ + json_t *root; + json_t *mlist; + int res; + unsigned int i; + + mlist = json_array (); + for (i=0;i<num_sessions;i++) + { + const struct TALER_EXCHANGEDB_LinkDataList *pos; + json_t *list = json_array (); + + for (pos = sessions[i].ldl; NULL != pos; pos = pos->next) + { + json_t *obj; + + obj = json_object (); + json_object_set_new (obj, + "link_enc", + TALER_json_from_data (pos->link_data_enc->coin_priv_enc, + sizeof (struct TALER_CoinSpendPrivateKeyP) + + pos->link_data_enc->blinding_key_enc_size)); + json_object_set_new (obj, + "denom_pub", + TALER_json_from_rsa_public_key (pos->denom_pub.rsa_public_key)); + json_object_set_new (obj, + "ev_sig", + TALER_json_from_rsa_signature (pos->ev_sig.rsa_signature)); + json_array_append_new (list, + obj); + } + root = json_object (); + json_object_set_new (root, + "new_coins", + list); + json_object_set_new (root, + "transfer_pub", + TALER_json_from_data (&sessions[i].transfer_pub, + sizeof (struct TALER_TransferPublicKeyP))); + json_object_set_new (root, + "secret_enc", + TALER_json_from_data (&sessions[i].shared_secret_enc, + sizeof (struct TALER_EncryptedLinkSecretP))); + json_array_append_new (mlist, + root); + } + res = TMH_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 +TMH_RESPONSE_reply_deposit_unknown (struct MHD_Connection *connection) +{ + return TMH_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 +TMH_RESPONSE_reply_deposit_pending (struct MHD_Connection *connection, + struct GNUNET_TIME_Absolute planned_exec_time) +{ + return TMH_RESPONSE_reply_json_pack (connection, + MHD_HTTP_ACCEPTED, + "{s:o}", + "execution_time", TALER_json_from_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 +TMH_RESPONSE_reply_deposit_wtid (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); + TMH_KS_sign (&cw.purpose, + &pub, + &sig); + return TMH_RESPONSE_reply_json_pack (connection, + MHD_HTTP_OK, + "{s:o, s:o, s:o, s:o, s:o, s:o}", + "wtid", TALER_json_from_data (wtid, + sizeof (*wtid)), + "execution_time", TALER_json_from_abs (exec_time), + "coin_contribution", TALER_json_from_amount (coin_contribution), + "exchange_sig", TALER_json_from_data (&sig, + sizeof (sig)), + "exchange_pub", TALER_json_from_data (&pub, + sizeof (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 deposits details about the combined deposits + * @return MHD result code + */ +int +TMH_RESPONSE_reply_wire_deposit_details (struct MHD_Connection *connection, + const struct TALER_Amount *total, + const struct TALER_MerchantPublicKeyP *merchant_pub, + const struct GNUNET_HashCode *h_wire, + json_t *deposits) +{ + /* FIXME: #4135: signing not implemented here */ + return TMH_RESPONSE_reply_json_pack (connection, + MHD_HTTP_OK, + "{s:o, s:o, s:o, s:o}", + "total", TALER_json_from_amount (total), + "merchant_pub", TALER_json_from_data (merchant_pub, + sizeof (struct TALER_MerchantPublicKeyP)), + "h_wire", TALER_json_from_data (h_wire, + sizeof (struct GNUNET_HashCode)), + "deposits", deposits); +} + + +/* end of taler-exchange-httpd_responses.c */ |