From 72dd9514aac1b59b81fc695b734de518cef1845b Mon Sep 17 00:00:00 2001 From: Christian Grothoff Date: Mon, 11 Apr 2022 13:52:06 +0200 Subject: -draft implementation of /purses//merge endpoint --- src/exchange/Makefile.am | 1 + src/exchange/taler-exchange-httpd_keys.h | 4 +- src/exchange/taler-exchange-httpd_metrics.h | 3 +- src/exchange/taler-exchange-httpd_purses_merge.c | 64 ++-- src/exchange/taler-exchange-httpd_purses_merge.h | 46 +++ src/exchange/taler-exchange-httpd_wire.c | 16 +- src/exchange/taler-exchange-httpd_wire.h | 14 + src/include/taler_crypto_lib.h | 27 ++ src/include/taler_exchange_service.h | 24 +- src/include/taler_signatures.h | 7 + src/lib/exchange_api_purse_merge.c | 408 +++++++++++++++++++++++ src/util/exchange_signatures.c | 131 ++++++++ 12 files changed, 708 insertions(+), 37 deletions(-) create mode 100644 src/exchange/taler-exchange-httpd_purses_merge.h create mode 100644 src/lib/exchange_api_purse_merge.c (limited to 'src') diff --git a/src/exchange/Makefile.am b/src/exchange/Makefile.am index c4c1656a5..949a1dcba 100644 --- a/src/exchange/Makefile.am +++ b/src/exchange/Makefile.am @@ -104,6 +104,7 @@ taler_exchange_httpd_SOURCES = \ taler-exchange-httpd_metrics.c taler-exchange-httpd_metrics.h \ taler-exchange-httpd_mhd.c taler-exchange-httpd_mhd.h \ taler-exchange-httpd_purses_create.c taler-exchange-httpd_purses_create.h \ + taler-exchange-httpd_purses_merge.c taler-exchange-httpd_purses_merge.h \ taler-exchange-httpd_recoup.c taler-exchange-httpd_recoup.h \ taler-exchange-httpd_recoup-refresh.c taler-exchange-httpd_recoup-refresh.h \ taler-exchange-httpd_refreshes_reveal.c taler-exchange-httpd_refreshes_reveal.h \ diff --git a/src/exchange/taler-exchange-httpd_keys.h b/src/exchange/taler-exchange-httpd_keys.h index 544906ad8..d8fe81e5c 100644 --- a/src/exchange/taler-exchange-httpd_keys.h +++ b/src/exchange/taler-exchange-httpd_keys.h @@ -318,8 +318,8 @@ TEH_keys_denomination_cs_r_pub_melt ( * @param h_denom_pub hash of the public key to revoke */ void -TEH_keys_denomination_revoke (const struct - TALER_DenominationHashP *h_denom_pub); +TEH_keys_denomination_revoke ( + const struct TALER_DenominationHashP *h_denom_pub); /** diff --git a/src/exchange/taler-exchange-httpd_metrics.h b/src/exchange/taler-exchange-httpd_metrics.h index d1d20d9aa..4fef6464a 100644 --- a/src/exchange/taler-exchange-httpd_metrics.h +++ b/src/exchange/taler-exchange-httpd_metrics.h @@ -36,7 +36,8 @@ enum TEH_MetricTypeRequest TEH_MT_REQUEST_WITHDRAW = 2, TEH_MT_REQUEST_MELT = 3, TEH_MT_REQUEST_PURSE_CREATE = 4, - TEH_MT_REQUEST_COUNT = 5 /* MUST BE LAST! */ + TEH_MT_REQUEST_PURSE_MERGE = 5, + TEH_MT_REQUEST_COUNT = 6 /* MUST BE LAST! */ }; /** diff --git a/src/exchange/taler-exchange-httpd_purses_merge.c b/src/exchange/taler-exchange-httpd_purses_merge.c index 07038cb6a..2121169c2 100644 --- a/src/exchange/taler-exchange-httpd_purses_merge.c +++ b/src/exchange/taler-exchange-httpd_purses_merge.c @@ -32,6 +32,7 @@ #include "taler-exchange-httpd_responses.h" #include "taler_exchangedb_lib.h" #include "taler-exchange-httpd_keys.h" +#include "taler-exchange-httpd_wire.h" /** @@ -59,6 +60,11 @@ struct PurseMergeContext */ struct GNUNET_TIME_Timestamp purse_expiration; + /** + * When the client signed the merge. + */ + struct GNUNET_TIME_Timestamp merge_timestamp; + /** * Our current time. */ @@ -92,7 +98,7 @@ struct PurseMergeContext /** * Fees that apply to this operation. */ - const struct TEH_GlobalFee *gf; + const struct TALER_WireFeeSet *wf; /** * URI of the account the purse is to be merged into. @@ -101,7 +107,7 @@ struct PurseMergeContext const char *payto_uri; /** - * Base URL of the exchange provider. + * Base URL of the exchange provider hosting the reserve. */ char *provider_url; @@ -138,10 +144,26 @@ reply_merge_success (struct MHD_Connection *connection, TALER_JSON_pack_amount ("balance", &pcc->balance)); } - // FIXME: check return value... - TALER_amount_subtract (&merge_amount, - &pcc->target_amount, - &gf->fees.merge); + if (0 == strcmp (pcc->provider_url, + TEH_base_url)) + { + /* wad fee is always zero if we stay at our own exchange */ + merge_amount = pcc->target_amount; + } + else + { + if (0 > + TALER_amount_subtract (&merge_amount, + &pcc->target_amount, + &pcc->wf->wad)) + { + GNUNET_break_op (0); + return TALER_MHD_reply_with_ec ( + connection, + TALER_EC_EXCHANGE_PURSE_MERGE_WAD_FEE_EXCEEDS_PURSE_VALUE, + TALER_amount2s (&pcc->wf->wad)); + } + } if (TALER_EC_NONE != (ec = TALER_exchange_online_purse_merged_sign ( &TEH_keys_exchange_sign_, @@ -149,8 +171,9 @@ reply_merge_success (struct MHD_Connection *connection, pcc->purse_expiration, &merge_amount, pcc->purse_pub, - &pcc->merge_pub, &pcc->h_contract_terms, + &pcc->reserve_pub, + pcc->provider_url, &pub, &sig))) { @@ -200,7 +223,7 @@ merge_transaction (void *cls, &pcc->merge_sig, pcc->merge_timestamp, pcc->provider_url, - &pcc.reserve_pub); + &pcc->reserve_pub); if (qs < 0) { if (GNUNET_DB_STATUS_SOFT_ERROR == qs) @@ -250,7 +273,7 @@ TEH_handler_purses_merge ( }; struct GNUNET_JSON_Specification spec[] = { GNUNET_JSON_spec_string ("payto_uri", - &pcc.payt_uri), + &pcc.payto_uri), GNUNET_JSON_spec_fixed_auto ("reserve_sig", &pcc.reserve_sig), GNUNET_JSON_spec_fixed_auto ("merge_sig", @@ -281,9 +304,9 @@ TEH_handler_purses_merge ( } } - pcc.gf = TEH_keys_global_fee_by_time (TEH_keys_get_state (), - pcc.exchange_timestamp); - if (NULL == pcc.gf) + pcc.wf = TEH_wire_fees_by_time (pcc.exchange_timestamp, + "sepa"); // FIXME! + if (NULL == pcc.wf) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Cannot create purse: global fees not configured!\n"); @@ -294,13 +317,13 @@ TEH_handler_purses_merge ( } /* Fetch purse details */ qs = TEH_plugin->select_purse_request (TEH_plugin->cls, - pcc->purse_pub, - &pcc->merge_pub, - &pcc->purse_expiration, - &pcc->h_contract_terms, - &pcc->min_age, - &pcc->target_amount, - &pcc->balance, + pcc.purse_pub, + &pcc.merge_pub, + &pcc.purse_expiration, + &pcc.h_contract_terms, + &pcc.min_age, + &pcc.target_amount, + &pcc.balance, &purse_sig); switch (qs) { @@ -395,8 +418,9 @@ TEH_handler_purses_merge ( /* check signatures */ if (GNUNET_OK != TALER_wallet_purse_merge_verify ( - pcc.payto_url, + pcc.payto_uri, pcc.merge_timestamp, + pcc.purse_pub, &pcc.merge_pub, &pcc.merge_sig)) { diff --git a/src/exchange/taler-exchange-httpd_purses_merge.h b/src/exchange/taler-exchange-httpd_purses_merge.h new file mode 100644 index 000000000..3bc6e1696 --- /dev/null +++ b/src/exchange/taler-exchange-httpd_purses_merge.h @@ -0,0 +1,46 @@ +/* + This file is part of TALER + Copyright (C) 2022 Taler Systems SA + + 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_purses_merge.h + * @brief Handle /purses/$PID/merge requests + * @author Christian Grothoff + */ +#ifndef TALER_EXCHANGE_HTTPD_PURSES_MERGE_H +#define TALER_EXCHANGE_HTTPD_PURSES_MERGE_H + +#include +#include +#include "taler-exchange-httpd.h" + + +/** + * Handle a "/purses/$PURSE_PUB/merge" request. Parses the JSON, and, if + * successful, passes the JSON data to #merge_transaction() to further check + * the details of the operation specified. If everything checks out, this + * will ultimately lead to the "purses merge" being executed, or rejected. + * + * @param connection the MHD connection to handle + * @param purse_pub public key of the purse + * @param root uploaded JSON data + * @return MHD result code + */ +MHD_RESULT +TEH_handler_purses_merge (struct MHD_Connection *connection, + const struct TALER_PurseContractPublicKeyP *purse_pub, + const json_t *root); + + +#endif diff --git a/src/exchange/taler-exchange-httpd_wire.c b/src/exchange/taler-exchange-httpd_wire.c index e1adde22a..cbd0f6400 100644 --- a/src/exchange/taler-exchange-httpd_wire.c +++ b/src/exchange/taler-exchange-httpd_wire.c @@ -158,11 +158,13 @@ make_ec_reply (enum TALER_ErrorCode ec, const char *detail) { return GNUNET_JSON_PACK ( - GNUNET_JSON_pack_uint64 ("code", ec), + GNUNET_JSON_pack_uint64 ("code", + ec), GNUNET_JSON_pack_string ("hint", TALER_ErrorCode_get_hint (ec)), GNUNET_JSON_pack_allow_null ( - GNUNET_JSON_pack_string ("detail", detail))); + GNUNET_JSON_pack_string ("detail", + detail))); } @@ -421,4 +423,14 @@ TEH_handler_wire (struct TEH_RequestContext *rc, } +const struct TALER_WireFeeSet * +TEH_wire_fees_by_time ( + struct GNUNET_TIME_Timestamp ts, + const char *method) +{ + GNUNET_break (0); // FIXME: implement! + return NULL; +} + + /* end of taler-exchange-httpd_wire.c */ diff --git a/src/exchange/taler-exchange-httpd_wire.h b/src/exchange/taler-exchange-httpd_wire.h index ed815a57e..75595fe69 100644 --- a/src/exchange/taler-exchange-httpd_wire.h +++ b/src/exchange/taler-exchange-httpd_wire.h @@ -33,6 +33,20 @@ void TEH_wire_done (void); +/** + * Look up wire fee structure by @a ts. + * + * @param ts timestamp to lookup wire fees at + * @param method wire method to lookup fees for + * @return the wire fee details, or + * NULL if none are configured for @a ts and @a method + */ +const struct TALER_WireFeeSet * +TEH_wire_fees_by_time ( + struct GNUNET_TIME_Timestamp ts, + const char *method); + + /** * Initialize wire subsystem. * diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h index 5f425341e..332923a9a 100644 --- a/src/include/taler_crypto_lib.h +++ b/src/include/taler_crypto_lib.h @@ -3875,6 +3875,33 @@ TALER_exchange_online_purse_created_verify ( const struct TALER_ExchangeSignatureP *sig); +enum TALER_ErrorCode +TALER_exchange_online_purse_merged_sign ( + TALER_ExchangeSignCallback scb, + struct GNUNET_TIME_Timestamp exchange_time, + struct GNUNET_TIME_Timestamp purse_expiration, + const struct TALER_Amount *amount_without_fee, + const struct TALER_PurseContractPublicKeyP *purse_pub, + const struct TALER_PrivateContractHashP *h_contract_terms, + const struct TALER_ReservePublicKeyP *reserve_pub, + const char *exchange_url, + struct TALER_ExchangePublicKeyP *pub, + struct TALER_ExchangeSignatureP *sig); + + +enum GNUNET_GenericReturnValue +TALER_exchange_online_purse_merged_verify ( + struct GNUNET_TIME_Timestamp exchange_time, + struct GNUNET_TIME_Timestamp purse_expiration, + const struct TALER_Amount *amount_without_fee, + const struct TALER_PurseContractPublicKeyP *purse_pub, + const struct TALER_PrivateContractHashP *h_contract_terms, + const struct TALER_ReservePublicKeyP *reserve_pub, + const char *exchange_url, + const struct TALER_ExchangePublicKeyP *pub, + const struct TALER_ExchangeSignatureP *sig); + + /* ********************* offline signing ************************** */ diff --git a/src/include/taler_exchange_service.h b/src/include/taler_exchange_service.h index 876e529f9..207573ed3 100644 --- a/src/include/taler_exchange_service.h +++ b/src/include/taler_exchange_service.h @@ -4383,12 +4383,14 @@ struct TALER_EXCHANGE_AccountMergeHandle; * Inform the exchange that a purse should be merged * with a reserve. * - * @param ctx the context - * @param url HTTP base URL for the exchange with the purse + * @param exchange the exchange hosting the purse * @param reserve_exchange_url base URL of the exchange with the reserve * @param reserve_priv private key of the reserve to merge into * @param purse_pub public key of the purse to merge * @param merge_priv private key granting us the right to merge + * @param h_contract_terms hash of the purses' contract + * @param min_age minimum age of deposits into the purse + * @param purse_value_after_fees amount that should be in the purse * @param merge_timestamp when is the merge happening (current time) * @param cb function to call with the exchange's result * @param cb_cls closure for @a cb @@ -4396,12 +4398,14 @@ struct TALER_EXCHANGE_AccountMergeHandle; */ struct TALER_EXCHANGE_AccountMergeHandle * TALER_EXCHANGE_account_merge ( - struct GNUNET_CURL_Context *ctx, - const char *url, + struct TALER_EXCHANGE_Handle *exchange, const char *reserve_exchange_url, const struct TALER_ReservePrivateKeyP *reserve_priv, const struct TALER_PurseContractPublicKeyP *purse_pub, const struct TALER_PurseMergePrivateKeyP *merge_priv, + const struct TALER_PrivateContractHashP *h_contract_terms, + uint8_t min_age, + const struct TALER_Amount *purse_value_after_fees, struct GNUNET_TIME_Timestamp merge_timestamp, TALER_EXCHANGE_AccountMergeCallback cb, void *cb_cls); @@ -4466,8 +4470,7 @@ struct TALER_EXCHANGE_PurseCreateMergeHandle; * Inform the exchange that a purse should be created * and merged with a reserve. * - * @param ctx the context - * @param url HTTP base URL for the exchange + * @param exchange the exchange hosting the reserve * @param reserve_priv private key of the reserve * @param purse_priv private key of the purse * @param contract_terms contract the purse is about @@ -4481,8 +4484,7 @@ struct TALER_EXCHANGE_PurseCreateMergeHandle; */ struct TALER_EXCHANGE_PurseCreateMergeHandle * TALER_EXCHANGE_purse_create_with_merge ( - struct GNUNET_CURL_Context *ctx, - const char *url, + struct TALER_EXCHANGE_Handle *exchange, const struct TALER_ReservePrivateKeyP *reserve_priv, const struct TALER_PurseContractPrivateKeyP *purse_priv, const json_t *contract_terms, @@ -4553,8 +4555,7 @@ struct TALER_EXCHANGE_PurseDepositHandle; * Inform the exchange that a deposit should be made into * a purse. * - * @param ctx the context - * @param url HTTP base URL for the exchange where we make the deposit + * @param exchange the exchange that issued the coins * @param purse_exchange_url base URL of the exchange hosting the purse * @param purse_pub public key of the purse to merge * @param min_age minimum age we need to prove for the purse @@ -4566,8 +4567,7 @@ struct TALER_EXCHANGE_PurseDepositHandle; */ struct TALER_EXCHANGE_PurseDepositHandle * TALER_EXCHANGE_purse_deposit ( - struct GNUNET_CURL_Context *ctx, - const char *url, + struct TALER_EXCHANGE_Handle *exchange, const char *purse_exchange_url, const struct TALER_PurseContractPublicKeyP *purse_pub, uint8_t min_age, diff --git a/src/include/taler_signatures.h b/src/include/taler_signatures.h index d3e70a9e7..45bdca590 100644 --- a/src/include/taler_signatures.h +++ b/src/include/taler_signatures.h @@ -182,6 +182,13 @@ */ #define TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_CREATION 1045 + +/** + * Signature by which the exchange affirms that a purse + * was merged into a reserve with a certain amount in it. + */ +#define TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_MERGED 1046 + /**********************/ /* Auditor signatures */ /**********************/ diff --git a/src/lib/exchange_api_purse_merge.c b/src/lib/exchange_api_purse_merge.c new file mode 100644 index 000000000..8f6723ee6 --- /dev/null +++ b/src/lib/exchange_api_purse_merge.c @@ -0,0 +1,408 @@ +/* + This file is part of TALER + Copyright (C) 2022 Taler Systems SA + + TALER is free software; you can redistribute it and/or modify it under the + terms of the GNU General Public License as published by the Free Software + Foundation; either version 3, or (at your option) any later version. + + TALER is distributed in the hope that it will be useful, but WITHOUT ANY + WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + A PARTICULAR PURPOSE. See the GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along with + TALER; see the file COPYING. If not, see + + */ +/** + * @file lib/exchange_api_purse_merge.c + * @brief Implementation of the client to merge a purse + * into an account + * @author Christian Grothoff + */ +#include "platform.h" +#include +#include /* just for HTTP status codes */ +#include +#include +#include +#include "taler_json_lib.h" +#include "taler_exchange_service.h" +#include "exchange_api_handle.h" +#include "taler_signatures.h" +#include "exchange_api_curl_defaults.h" + + +/** + * @brief A purse merge with deposit handle + */ +struct TALER_EXCHANGE_AccountMergeHandle +{ + + /** + * The connection to exchange this request handle will use + */ + struct TALER_EXCHANGE_Handle *exchange; + + /** + * The url for this request. + */ + char *url; + + /** + * Context for #TEH_curl_easy_post(). Keeps the data that must + * persist for Curl to make the upload. + */ + struct TALER_CURL_PostContext ctx; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_EXCHANGE_AccountMergeCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + + /** + * Expected value in the purse after fees. + */ + struct TALER_Amount purse_value_after_fees; + + /** + * Public key of the merge capability. + */ + struct TALER_AccountMergePublicKeyP merge_pub; + + /** + * Public key of the purse. + */ + struct TALER_PurseContractPublicKeyP purse_pub; + + /** + * Hash over the purse's contrac terms. + */ + struct TALER_PrivateContractHashP h_contract_terms; + + /** + * When does the purse expire. + */ + struct GNUNET_TIME_Timestamp purse_expiration; +}; + + +/** + * Function called when we're done processing the + * HTTP /purse/$PID/merge request. + * + * @param cls the `struct TALER_EXCHANGE_AccountMergeHandle` + * @param response_code HTTP response code, 0 on error + * @param response parsed JSON result, NULL on error + */ +static void +handle_purse_merge_finished (void *cls, + long response_code, + const void *response) +{ + struct TALER_EXCHANGE_AccountMergeHandle *pch = cls; + const json_t *j = response; + struct TALER_EXCHANGE_AccountMergeResponse dr = { + .hr.reply = j, + .hr.http_status = (unsigned int) response_code + }; + + pch->job = NULL; + switch (response_code) + { + case 0: + dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE; + break; + case MHD_HTTP_OK: + { + const struct TALER_EXCHANGE_Keys *key_state; + struct GNUNET_TIME_Timestamp etime; + struct TALER_Amount total_deposited; + struct TALER_ExchangeSignatureP exchange_sig; + struct TALER_ExchangePublicKeyP exchange_pub; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_fixed_auto ("exchange_sig", + &exchange_sig), + GNUNET_JSON_spec_fixed_auto ("exchange_pub", + &exchange_pub), + GNUNET_JSON_spec_timestamp ("exchange_timestamp", + &etime), + TALER_JSON_spec_amount ("total_deposited", + pch->purse_value_after_fees.currency, + &total_deposited), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (j, + spec, + NULL, NULL)) + { + GNUNET_break_op (0); + dr.hr.http_status = 0; + dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + break; + } + key_state = TALER_EXCHANGE_get_keys (pch->exchange); + if (GNUNET_OK != + TALER_EXCHANGE_test_signing_key (key_state, + &exchange_pub)) + { + GNUNET_break_op (0); + dr.hr.http_status = 0; + dr.hr.ec = TALER_EC_EXCHANGE_PURSE_MERGE_EXCHANGE_SIGNATURE_INVALID; + break; + } + if (GNUNET_OK != + TALER_exchange_online_purse_merged_verify ( + etime, + pch->purse_expiration, + &pch->purse_value_after_fees, + &total_deposited, + &pch->purse_pub, + &pch->merge_pub, + &pch->h_contract_terms, + &exchange_pub, + &exchange_sig)) + { + GNUNET_break_op (0); + dr.hr.http_status = 0; + dr.hr.ec = TALER_EC_EXCHANGE_PURSE_MERGE_EXCHANGE_SIGNATURE_INVALID; + break; + } + } + break; + case MHD_HTTP_BAD_REQUEST: + /* This should never happen, either us or the exchange is buggy + (or API version conflict); just pass JSON reply to the application */ + dr.hr.ec = TALER_JSON_get_error_code (j); + dr.hr.hint = TALER_JSON_get_error_hint (j); + break; + case MHD_HTTP_FORBIDDEN: + dr.hr.ec = TALER_JSON_get_error_code (j); + dr.hr.hint = TALER_JSON_get_error_hint (j); + /* Nothing really to verify, exchange says one of the signatures is + invalid; as we checked them, this should never happen, we + should pass the JSON reply to the application */ + break; + case MHD_HTTP_NOT_FOUND: + dr.hr.ec = TALER_JSON_get_error_code (j); + dr.hr.hint = TALER_JSON_get_error_hint (j); + /* Nothing really to verify, this should never + happen, we should pass the JSON reply to the application */ + break; + case MHD_HTTP_CONFLICT: + // FIXME: check reply! + break; + case MHD_HTTP_GONE: + /* could happen if denomination was revoked */ + /* Note: one might want to check /keys for revocation + signature here, alas tricky in case our /keys + is outdated => left to clients */ + dr.hr.ec = TALER_JSON_get_error_code (j); + dr.hr.hint = TALER_JSON_get_error_hint (j); + break; + case MHD_HTTP_INTERNAL_SERVER_ERROR: + dr.hr.ec = TALER_JSON_get_error_code (j); + dr.hr.hint = TALER_JSON_get_error_hint (j); + /* Server had an internal issue; we should retry, but this API + leaves this to the application */ + break; + default: + /* unexpected response code */ + dr.hr.ec = TALER_JSON_get_error_code (j); + dr.hr.hint = TALER_JSON_get_error_hint (j); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Unexpected response code %u/%d for exchange deposit\n", + (unsigned int) response_code, + dr.hr.ec); + GNUNET_break_op (0); + break; + } + pch->cb (pch->cb_cls, + &dr); + TALER_EXCHANGE_purse_merge_with_deposit_cancel (pch); +} + + +struct TALER_EXCHANGE_AccountMergeHandle * +TALER_EXCHANGE_account_merge ( + struct TALER_EXCHANGE_Handle *exchange, + const char *reserve_exchange_url, + const struct TALER_ReservePrivateKeyP *reserve_priv, + const struct TALER_PurseContractPublicKeyP *purse_pub, + const struct TALER_PurseMergePrivateKeyP *merge_priv, + const struct TALER_PrivateContractHashP *h_contract_terms, + uint8_t min_age, + const struct TALER_Amount *purse_value_after_fees, + struct GNUNET_TIME_Timestamp purse_expiration, + struct GNUNET_TIME_Timestamp merge_timestamp, + TALER_EXCHANGE_AccountMergeCallback cb, + void *cb_cls) +{ + struct TALER_EXCHANGE_AccountMergeHandle *pch; + struct GNUNET_CURL_Context *ctx; + json_t *merge_obj; + CURL *eh; + struct TALER_PurseMergeSignatureP merge_sig; + struct TALER_ReserveSignatureP account_sig; + char arg_str[sizeof (pch->purse_pub) * 2 + 32]; + char *url; + char *reserve_url; + + pch = GNUNET_new (struct TALER_EXCHANGE_AccountMergeHandle); + pch->exchange = exchange; + pch->cb = cb; + pch->cb_cls = cb_cls; + pch->merge_timestamp = merge_timestamp; + pch->purse_pub = *purse_pub; + pch->h_contract_terms = *h_contract_terms; + pch->purse_expiration = purse_expiration; + pch->purse_value_after_fees = *purse_value_after_fees; + GNUNET_assert (GNUNET_YES == + TEAH_handle_is_ready (exchange)); + { + char pub_str[sizeof (*purse_pub) * 2]; + char *end; + + end = GNUNET_STRINGS_data_to_string ( + purse_pub, + sizeof (*purse_pub), + pub_str, + sizeof (pub_str)); + *end = '\0'; + GNUNET_snprintf (arg_str, + sizeof (arg_str), + "/purses/%s/merge", + pub_str); + } + { + struct TALER_ReservePublicKeyP reserve_pub; + char pub_str[sizeof (reserve_pub) * 2]; + char *end; + const char *exchange_url; + bool is_http; + + GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv, + &reserve_pub.eddsa_pub); + + end = GNUNET_STRINGS_data_to_string ( + &reserve_pub, + sizeof (reserve_pub), + pub_str, + sizeof (pub_str)); + *end = '\0'; + if (0 == strncmp (reserve_exchange_url, + "http://", + strlen ("http://"))) + { + is_http = true; + exchange_url = &reserve_exchange_url[strlen ("http://")]; + } + else if (0 == strncmp (reserve_exchange_url, + "https://", + strlen ("https://"))) + { + is_http = false; + exchange_url = &reserve_exchange_url[strlen ("https://")]; + } + else + { + GNUNET_break (0); + GNUNET_free (pch); + return NULL; + } + GNUNET_asprintf (&reserve_url, + "payto://%s/%s/%s", + is_http ? "taler+http" : "taler", + pub_str, + exchange_url); + } + pch->url = TEAH_path_to_url (exchange, + arg_str); + if (NULL == pch->url) + { + GNUNET_break (0); + GNUNET_free (pch); + return NULL; + } + GNUNET_CRYPTO_eddsa_key_get_public (&merge_priv->eddsa_priv, + &pch->merge_pub.eddsa_pub); + TALER_wallet_purse_merge_sign (reserve_url, + merge_timestamp, + purse_pub, + merge_priv, + &merge_sig); + TALER_wallet_account_merge_sign (merge_timestamp, + purse_pub, + purse_expiration, + h_contract_terms, + purse_value_after_fees, + min_age, + reserve_priv, + &reserve_sig); + merge_obj = GNUNET_JSON_PACK ( + GNUNET_JSON_pack_string ("payto_uri", + reserve_url), + GNUNET_JSON_pack_data_auto ("merge_sig", + &merge_sig), + GNUNET_JSON_pack_data_auto ("reserve_sig", + &reserve_sig), + GNUNET_JSON_pack_timestamp ("merge_timestamp", + merge_timestamp)); + GNUNET_assert (NULL != merge_obj); + eh = TALER_EXCHANGE_curl_easy_get_ (pch->url); + if ( (NULL == eh) || + (GNUNET_OK != + TALER_curl_easy_post (&pch->ctx, + eh, + merge_obj)) ) + { + GNUNET_break (0); + if (NULL != eh) + curl_easy_cleanup (eh); + json_decref (merge_obj); + GNUNET_free (pch->url); + GNUNET_free (pch); + return NULL; + } + json_decref (merge_obj); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "URL for purse merge with deposit: `%s'\n", + pch->url); + ctx = TEAH_handle_to_context (exchange); + pch->job = GNUNET_CURL_job_add2 (ctx, + eh, + pch->ctx.headers, + &handle_purse_merge_deposit_finished, + pch); + return pch; +} + + +void +TALER_EXCHANGE_account_merge_cancel ( + struct TALER_EXCHANGE_AccountMergeHandle *pch) +{ + if (NULL != pch->job) + { + GNUNET_CURL_job_cancel (pch->job); + pch->job = NULL; + } + GNUNET_free (pch->url); + TALER_curl_easy_post_finished (&pch->ctx); + GNUNET_free (pch); +} + + +/* end of exchange_api_purse_merge.c */ diff --git a/src/util/exchange_signatures.c b/src/util/exchange_signatures.c index eeec0d613..d6214ab3e 100644 --- a/src/util/exchange_signatures.c +++ b/src/util/exchange_signatures.c @@ -1338,6 +1338,10 @@ TALER_exchange_online_purse_created_sign ( .exchange_time = GNUNET_TIME_timestamp_hton (exchange_time) }; + TALER_amount_hton (&dc.amount_without_fee, + amount_without_fee); + TALER_amount_hton (&dc.total_deposited, + total_deposited); return scb (&dc.purpose, pub, sig); @@ -1366,6 +1370,10 @@ TALER_exchange_online_purse_created_verify ( .exchange_time = GNUNET_TIME_timestamp_hton (exchange_time) }; + TALER_amount_hton (&dc.amount_without_fee, + amount_without_fee); + TALER_amount_hton (&dc.total_deposited, + total_deposited); return GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_CREATION, &dc, @@ -1374,4 +1382,127 @@ TALER_exchange_online_purse_created_verify ( } +GNUNET_NETWORK_STRUCT_BEGIN + +/** + * Response by which the exchange affirms that it has + * merged a purse into a reserve. + */ +struct TALER_PurseMergedConfirmationPS +{ + + /** + * Purpose is #TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_MERGED + */ + struct GNUNET_CRYPTO_EccSignaturePurpose purpose; + + /** + * When did the exchange receive the deposits. + */ + struct GNUNET_TIME_TimestampNBO exchange_time; + + /** + * When will the purse expire? + */ + struct GNUNET_TIME_TimestampNBO purse_expiration; + + /** + * How much should the purse ultimately contain. + */ + struct TALER_AmountNBO amount_without_fee; + + /** + * Public key of the purse. + */ + struct TALER_PurseContractPublicKeyP purse_pub; + + /** + * Public key of the reserve. + */ + struct TALER_ReservePublicKeyP reserve_pub; + + /** + * Hash of the contract of the purse. + */ + struct TALER_PrivateContractHashP h_contract_terms; + + /** + * Hash of the provider URL hosting the reserve. + */ + struct GNUNET_HashCode h_provider_url; + +}; + +GNUNET_NETWORK_STRUCT_END + + +enum TALER_ErrorCode +TALER_exchange_online_purse_merged_sign ( + TALER_ExchangeSignCallback scb, + struct GNUNET_TIME_Timestamp exchange_time, + struct GNUNET_TIME_Timestamp purse_expiration, + const struct TALER_Amount *amount_without_fee, + const struct TALER_PurseContractPublicKeyP *purse_pub, + const struct TALER_PrivateContractHashP *h_contract_terms, + const struct TALER_ReservePublicKeyP *reserve_pub, + const char *exchange_url, + struct TALER_ExchangePublicKeyP *pub, + struct TALER_ExchangeSignatureP *sig) +{ + struct TALER_PurseMergedConfirmationPS dc = { + .purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_MERGED), + .purpose.size = htonl (sizeof (dc)), + .h_contract_terms = *h_contract_terms, + .purse_pub = *purse_pub, + .reserve_pub = *reserve_pub, + .purse_expiration = GNUNET_TIME_timestamp_hton (purse_expiration), + .exchange_time = GNUNET_TIME_timestamp_hton (exchange_time) + }; + + TALER_amount_hton (&dc.amount_without_fee, + amount_without_fee); + GNUNET_CRYPTO_hash (exchange_url, + strlen (exchange_url) + 1, + &dc.h_provider_url); + return scb (&dc.purpose, + pub, + sig); +} + + +enum GNUNET_GenericReturnValue +TALER_exchange_online_purse_merged_verify ( + struct GNUNET_TIME_Timestamp exchange_time, + struct GNUNET_TIME_Timestamp purse_expiration, + const struct TALER_Amount *amount_without_fee, + const struct TALER_PurseContractPublicKeyP *purse_pub, + const struct TALER_PrivateContractHashP *h_contract_terms, + const struct TALER_ReservePublicKeyP *reserve_pub, + const char *exchange_url, + const struct TALER_ExchangePublicKeyP *pub, + const struct TALER_ExchangeSignatureP *sig) +{ + struct TALER_PurseMergedConfirmationPS dc = { + .purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_MERGED), + .purpose.size = htonl (sizeof (dc)), + .h_contract_terms = *h_contract_terms, + .purse_pub = *purse_pub, + .reserve_pub = *reserve_pub, + .purse_expiration = GNUNET_TIME_timestamp_hton (purse_expiration), + .exchange_time = GNUNET_TIME_timestamp_hton (exchange_time) + }; + + TALER_amount_hton (&dc.amount_without_fee, + amount_without_fee); + GNUNET_CRYPTO_hash (exchange_url, + strlen (exchange_url) + 1, + &dc.h_provider_url); + return + GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_MERGED, + &dc, + &sig->eddsa_signature, + &pub->eddsa_pub); +} + + /* end of exchange_signatures.c */ -- cgit v1.2.3