From 463fd2d5577f396158ac6a53ef4be6e0913c830f Mon Sep 17 00:00:00 2001 From: Christian Grothoff Date: Mon, 22 Jun 2015 18:35:13 +0200 Subject: starting with withdraw impl --- src/mint-lib/mint_api_withdraw.c | 363 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 363 insertions(+) create mode 100644 src/mint-lib/mint_api_withdraw.c (limited to 'src') diff --git a/src/mint-lib/mint_api_withdraw.c b/src/mint-lib/mint_api_withdraw.c new file mode 100644 index 000000000..31bc0ac2d --- /dev/null +++ b/src/mint-lib/mint_api_withdraw.c @@ -0,0 +1,363 @@ +/* + This file is part of TALER + Copyright (C) 2014, 2015 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 + +*/ +/** + * @file mint-lib/mint_api_withdraw.c + * @brief Implementation of the /withdraw requests of the mint's HTTP API + * @author Christian Grothoff + */ +#include "platform.h" +#include +#include +#include /* just for HTTP status codes */ +#include +#include "taler_mint_service.h" +#include "mint_api_json.h" +#include "mint_api_context.h" +#include "mint_api_handle.h" +#include "taler_signatures.h" + + +/** + * Print JSON parsing related error information + */ +#define JSON_WARN(error) \ + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, \ + "JSON parsing failed at %s:%u: %s (%s)", \ + __FILE__, __LINE__, error.text, error.source) + + +/** + * @brief A Withdraw Status Handle + */ +struct TALER_MINT_WithdrawStatusHandle +{ + + /** + * The connection to mint this request handle will use + */ + struct TALER_MINT_Handle *mint; + + /** + * The url for this request. + */ + char *url; + + /** + * Handle for the request. + */ + struct MAC_Job *job; + + /** + * Function to call with the result. + */ + TALER_MINT_WithdrawStatusResultCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + + /** + * Download buffer + */ + void *buf; + + /** + * The size of the download buffer + */ + size_t buf_size; + + /** + * Error code (based on libc errno) if we failed to download + * (i.e. response too large). + */ + int eno; + +}; + + +/** + * Function called when we're done processing the + * HTTP /withdraw/status request. + * + * @param cls the `struct TALER_MINT_WithdrawStatusHandle` + */ +static void +handle_withdraw_status_finished (void *cls, + CURL *eh) +{ + struct TALER_MINT_WithdrawStatusHandle *wsh = cls; + long response_code; + json_error_t error; + json_t *json; + + json = NULL; + if (0 == dh->eno) + { + json = json_loadb (dh->buf, + dh->buf_size, + JSON_REJECT_DUPLICATES | JSON_DISABLE_EOF_CHECK, + &error); + if (NULL == json) + { + JSON_WARN (error); + response_code = 0; + } + } + if (NULL != json) + { + if (CURLE_OK != + curl_easy_getinfo (eh, + CURLINFO_RESPONSE_CODE, + &response_code)) + { + /* unexpected error... */ + GNUNET_break (0); + response_code = 0; + } + } + switch (response_code) + { + case MHD_HTTP_OK: + GNUNET_break (0); // FIXME + break; + case MHD_HTTP_BAD_REQUEST: + /* This should never happen, either us or the mint is buggy + (or API version conflict); just pass JSON reply to the application */ + break; + case MHD_HTTP_FORBIDDEN: + GNUNET_break (0); // FIXME + break; + case MHD_HTTP_NOT_FOUND: + /* Nothing really to verify, this should never + happen, we should pass the JSON reply to the application */ + break; + case MHD_HTTP_INTERNAL_SERVER_ERROR: + /* Server had an internal issue; we should retry, but this API + leaves this to the application */ + break; + default: + /* unexpected response code */ + GNUNET_break (0); + response_code = 0; + break; + } + GNUNET_break (0); // FIXME + wsh->cb (wsh->cb_cls, + response_code, + NULL, + 0, NULL); + json_decref (json); + TALER_MINT_withdraw_status_cancel (dh); +} + + +/** + * Callback used when downloading the reply to a /withdraw/status request. + * Just appends all of the data to the `buf` in the + * `struct TALER_MINT_WithdrawStatusHandle` for further processing. The size of + * the download is limited to #GNUNET_MAX_MALLOC_CHECKED, if + * the download exceeds this size, we abort with an error. + * + * @param bufptr data downloaded via HTTP + * @param size size of an item in @a bufptr + * @param nitems number of items in @a bufptr + * @param cls the `struct TALER_MINT_DepositHandle` + * @return number of bytes processed from @a bufptr + */ +static int +withdraw_status_download_cb (char *bufptr, + size_t size, + size_t nitems, + void *cls) +{ + struct TALER_MINT_WithdrawStatusHandle *wsh = cls; + size_t msize; + void *buf; + + if (0 == size * nitems) + { + /* Nothing (left) to do */ + return 0; + } + msize = size * nitems; + if ( (msize + wsh->buf_size) >= GNUNET_MAX_MALLOC_CHECKED) + { + wsh->eno = ENOMEM; + return 0; /* signals an error to curl */ + } + wsh->buf = GNUNET_realloc (wsh->buf, + wsh->buf_size + msize); + buf = wsh->buf + wsh->buf_size; + memcpy (buf, bufptr, msize); + wsh->buf_size += msize; + return msize; +} + + +/** + * Submit a request to obtain the transaction history of a reserve + * from the mint. Note that while we return the full response to the + * caller for further processing, we do already verify that the + * response is well-formed (i.e. that signatures included in the + * response are all valid and add up to the balance). If the mint's + * reply is not well-formed, we return an HTTP status code of zero to + * @a cb. + * + * @param mint the mint handle; the mint must be ready to operate + * @param reserve_pub public key of the reserve to inspect + * @param cb the callback to call when a reply for this request is available + * @param cb_cls closure for the above callback + * @return a handle for this request; NULL if the inputs are invalid (i.e. + * signatures fail to verify). In this case, the callback is not called. + */ +struct TALER_MINT_WithdrawStatusHandle * +TALER_MINT_withdraw_status (struct TALER_MINT_Handle *mint, + const struct TALER_ReservePublicKeyP *reserve_pub, + TALER_MINT_WithdrawStatusResultCallback cb, + void *cb_cls); +{ + struct TALER_MINT_WithdrawStatusHandle *wsh; + struct TALER_MINT_Context *ctx; + CURL *eh; + + if (GNUNET_YES != + MAH_handle_is_ready (mint)) + { + GNUNET_break (0); + return NULL; + } + wsh = GNUNET_new (struct TALER_MINT_WithdrawStatusHandle); + wsh->mint = mint; + wsh->cb = cb; + wsh->cb_cls = cb_cls; + wsh->url = MAH_path_to_url (mint, "/withdraw/status"); + + eh = curl_easy_init (); + GNUNET_assert (NULL != (dh->json_enc = + json_dumps (deposit_obj, + JSON_COMPACT))); + json_decref (deposit_obj); + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_URL, + wsh->url)); +#if 0 + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_POSTFIELDS, + wsh->json_enc)); + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_POSTFIELDSIZE, + strlen (wsh->json_enc))); +#endif + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_WRITEFUNCTION, + &deposit_download_cb)); + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_WRITEDATA, + wsh)); +#if 0 + GNUNET_assert (NULL != (wsh->headers = + curl_slist_append (wsh->headers, + "Content-Type: application/json"))); + GNUNET_assert (CURLE_OK == + curl_easy_setopt (wsh, + CURLOPT_HTTPHEADER, + wsh->headers)); +#endif + GNUNET_break (0); // FIXME + ctx = MAH_handle_to_context (mint); + wsh->job = MAC_job_add (ctx, + eh, + &handle_withdraw_status_finished, + wsh); + return dh; +} + + +/** + * Cancel a withdraw status request. This function cannot be used + * on a request handle if a response is already served for it. + * + * @param wsh the withdraw status request handle + */ +void +TALER_MINT_withdraw_status_cancel (struct TALER_MINT_WithdrawStatusHandle *wsh) +{ + MAC_job_cancel (wsh->job); +#if 0 + curl_slist_free_all (wsh->headers); + GNUNET_free (wsh->json_enc); +#endif + GNUNET_free (wsh->url); + GNUNET_free (wsh); +} + + + + +/** + * Withdraw a coin from the mint using a /withdraw/sign request. Note + * that to ensure that no money is lost in case of hardware failures, + * the caller must have committed (most of) the arguments to disk + * before calling, and be ready to repeat the request with the same + * arguments in case of failures. + * + * @param mint the mint handle; the mint must be ready to operate + * @param pk kind of coin to create + * @param coin_priv where to store the coin's private key, + * caller must have committed this value to disk before the call (with @a pk) + * @param blinding_key where to store the coin's blinding key + * caller must have committed this value to disk before the call (with @a pk) + * @param res_cb the callback to call when the final result for this request is available + * @param res_cb_cls closure for the above callback + * @return #GNUNET_OK on success, #GNUNET_SYSERR + * if the inputs are invalid (i.e. denomination key not with this mint). + * In this case, the callback is not called. + */ +struct TALER_MINT_WithdrawSignHandle * +TALER_MINT_withdraw_sign (struct TALER_MINT_Handle *mint, + const struct TALER_MINT_DenomPubKey *pk, + const struct TALER_ReservePrivateKeyP *reserve_priv, + const struct TALER_MINT_CoinSpendPrivateKeyP *coin_priv, + const struct TALER_DenominationBlindingKey *blinding_key, + TALER_MINT_WithdrawSignResultCallback res_cb, + void *res_cb_cls) +{ + GNUNET_break (0); // FIXME + return NULL; +} + + +/** + * Cancel a withdraw status request. This function cannot be used + * on a request handle if a response is already served for it. + * + * @param sign the withdraw sign request handle + */ +void +TALER_MINT_withdraw_sign_cancel (struct TALER_MINT_WithdrawSignHandle *sign) +{ + GNUNET_break (0); // FIXME +} + + +/* end of mint_api_withdraw.c */ -- cgit v1.2.3