311 lines
9.5 KiB
C
311 lines
9.5 KiB
C
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/*
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This file is part of TALER
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Copyright (C) 2014, 2015 Christian Grothoff (and other contributing authors)
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, If not, see
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<http://www.gnu.org/licenses/>
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*/
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/**
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* @file mint-lib/mint_api_deposit.c
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* @brief Implementation of the /deposit request of the mint's HTTP API
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* @author Sree Harsha Totakura <sreeharsha@totakura.in>
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <curl/curl.h>
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#include <jansson.h>
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#include <gnunet/gnunet_util_lib.h>
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#include "taler_mint_service.h"
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#include "taler_signatures.h"
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/**
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* @brief A Deposit Handle
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*/
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struct TALER_MINT_DepositHandle
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{
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/**
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* The connection to mint this request handle will use
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*/
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struct TALER_MINT_Handle *mint;
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/**
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* The url for this request.
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*/
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char *url;
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/**
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* JSON encoding of the request to POST.
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*/
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char *json_enc;
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/**
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* Handle for the request.
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*/
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struct MAC_Job *job;
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/**
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* HTTP headers for the request.
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*/
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struct curl_slist *headers;
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/**
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* Function to call with the result.
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*/
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TALER_MINT_DepositResultCallback cb;
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/**
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* Closure for @a cb.
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*/
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void *cb_cls;
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/**
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* Download buffer
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*/
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void *buf;
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/**
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* The size of the download buffer
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*/
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size_t buf_size;
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/**
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* Error code (based on libc errno) if we failed to download
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* (i.e. response too large).
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*/
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int eno;
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};
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/**
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* Function called when we're done processing the
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* HTTP /deposit request.
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*
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* @param cls the `struct TALER_MINT_DepositHandle`
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*/
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static void
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handle_deposit_finished (void *cls,
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CURL *eh)
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{
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struct TALER_MINT_DepositHandle *dh = cls;
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unsigned int response_code;
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json_error_t error;
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json_t *json;
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json = NULL;
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if (0 == dh->eno)
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{
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json = json_loadb (dh->buf,
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dh->buf_size,
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JSON_REJECT_DUPLICATES | JSON_DISABLE_EOF_CHECK,
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&error);
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if (NULL == json)
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{
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JSON_WARN (error);
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response_code = 0;
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}
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}
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if (NULL != json)
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{
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response_code = 42;
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}
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switch (response_code)
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{
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/* FIXME: verify json response signatures
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(and that format matches response_code) */
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default:
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/* unexpected response code */
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GNUNET_break (0);
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response_code = 0;
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break;
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}
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dh->cb (dh->cb_cls,
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response_code,
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json);
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json_decref (json);
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TALER_MINT_deposit_cancel (dh);
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}
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/**
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* Callback used when downloading the reply to a /deposit request.
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* Just appends all of the data to the `buf` in the
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* `struct TALER_MINT_DepositHandle` for further processing. The size of
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* the download is limited to #GNUNET_MAX_MALLOC_CHECKED, if
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* the download exceeds this size, we abort with an error.
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*
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* @param bufptr data downloaded via HTTP
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* @param size size of an item in @a bufptr
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* @param nitems number of items in @a bufptr
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* @param cls the `struct TALER_MINT_DepositHandle`
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* @return number of bytes processed from @a bufptr
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*/
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static int
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deposit_download_cb (char *bufptr,
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size_t size,
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size_t nitems,
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void *cls)
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{
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struct TALER_MINT_DepositHandle *dh = cls;
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size_t msize;
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void *buf;
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if (0 == size * nitems)
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{
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/* Nothing (left) to do */
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return 0;
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}
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msize = size * nitems;
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if ( (msize + dh->buf_size) >= GNUNET_MAX_MALLOC_CHECKED)
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{
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dh->eno = ENOMEM;
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return 0; /* signals an error to curl */
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}
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dh->buf = GNUNET_realloc (dh->buf,
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dh->buf_size + msize);
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buf = dh->buf + dh->buf_size;
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memcpy (buf, bufptr, msize);
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dh->buf_size += msize;
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return msize;
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}
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/**
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* Submit a deposit permission to the mint and get the mint's response.
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* Note that while we return the response verbatim to the caller for
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* further processing, we do already verify that the response is
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* well-formed (i.e. that signatures included in the response are all
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* valid). If the mint's reply is not well-formed, we return an
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* HTTP status code of zero to @a cb.
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*
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* We also verify that the @a coin_sig is valid for this deposit
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* request, and that the @a ub_sig is a valid signature for @a
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* coin_pub. Also, the @a mint must be ready to operate (i.e. have
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* finished processing the /keys reply). If either check fails, we do
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* NOT initiate the transaction with the mint and instead return NULL.
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*
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* @param mint the mint handle; the mint must be ready to operate
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* @param amount the amount to be deposited
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* @param wire the merchant’s account details, in a format supported by the mint
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* @param h_contract hash of the contact of the merchant with the customer (further details are never disclosed to the mint)
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* @param coin_pub coin’s public key
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* @param denom_pub denomination key with which the coin is signed
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* @param ub_sig mint’s unblinded signature of the coin
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* @param timestamp timestamp when the contract was finalized, must match approximately the current time of the mint
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* @param transaction_id transaction id for the transaction between merchant and customer
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* @param merchant_pub the public key of the merchant (used to identify the merchant for refund requests)
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* @param refund_deadline date until which the merchant can issue a refund to the customer via the mint (can be zero if refunds are not allowed)
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* @param coin_sig the signature made with purpose #TALER_SIGNATURE_WALLET_COIN_DEPOSIT made by the customer with the coin’s private key.
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* @param cb the callback to call when a reply for this request is available
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* @param cb_cls closure for the above callback
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* @return a handle for this request; NULL if the inputs are invalid (i.e.
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* signatures fail to verify). In this case, the callback is not called.
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*/
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struct TALER_MINT_DepositHandle *
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TALER_MINT_deposit (struct TALER_MINT_Handle *mint,
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const struct TALER_Amount *amount,
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json_t *wire_details,
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const struct GNUNET_HashCode *h_contract,
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const struct TALER_CoinSpendPublicKeyP *coin_pub,
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const struct TALER_DenominationSignature *denom_sig,
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const struct TALER_DenominationPublicKey *denom_pub,
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struct GNUNET_TIME_Absolute timestamp,
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uint64_t transaction_id,
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const struct TALER_MerchantPublicKeyP *merchant_pub,
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struct GNUNET_TIME_Absolute refund_deadline,
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const struct TALER_CoinSpendSignatureP *coin_sig,
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TALER_MINT_DepositResultCallback cb,
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void *cb_cls)
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{
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struct TALER_MINT_DepositHandle *dh;
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struct TALER_MINT_Context *ctx;
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json_t *deposit_obj;
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CURL *eh;
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if (GNUNET_YES !=
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MAH_handle_is_ready (mint))
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{
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GNUNET_break (0);
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return NULL;
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}
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GNUNET_break (0); /* FIXME: verify all sigs! */
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deposit_obj = json_new (); /* FIXME: actually build JSON request */
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dh = GNUNET_new (struct TALER_MINT_DepositHandle);
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dh->mint = mint;
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dh->cb = cb;
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dh->cb_cls = cb_cls;
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dh->url = MAH_path_to_url (mint, "/deposit");
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eh = curl_easy_init ();
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/* FIXME: strdup() json_enc? Free deposit_obj! */
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GNUNET_assert (NULL != (dh->json_enc =
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json_dumps (deposit_obj,
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JSON_COMPACT)));
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GNUNET_assert (CURLE_OK ==
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curl_easy_setopt (eh,
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CURLOPT_URL,
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dh->url));
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GNUNET_assert (CURLE_OK ==
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curl_easy_setopt (eh,
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CURLOPT_POSTFIELDS,
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dh->json_enc));
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GNUNET_assert (CURLE_OK ==
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curl_easy_setopt (eh,
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CURLOPT_POSTFIELDSIZE,
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strlen (dh->json_enc)));
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GNUNET_assert (CURLE_OK ==
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curl_easy_setopt (c,
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CURLOPT_WRITEFUNCTION,
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&keys_download_cb));
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GNUNET_assert (CURLE_OK ==
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curl_easy_setopt (c,
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CURLOPT_WRITEDATA,
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kr));
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GNUNET_assert (NULL != (dh->headers =
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curl_slist_append (dh->headers,
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"Content-Type: application/json")));
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GNUNET_assert (CURLE_OK ==
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curl_easy_setopt (eh,
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CURLOPT_HTTPHEADER,
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dh->headers));
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ctx = MAH_handle_to_context (mint);
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dh->job = MAC_job_add (ctx,
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eh,
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&handle_deposit_reply,
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dh);
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return dh;
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}
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/**
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* Cancel a deposit permission request. This function cannot be used
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* on a request handle if a response is already served for it.
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*
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* @param deposit the deposit permission request handle
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*/
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void
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TALER_MINT_deposit_cancel (struct TALER_MINT_DepositHandle *deposit)
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{
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MAC_job_cancel (deposit->job);
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curl_slist_free_all (deposit->headers);
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GNUNET_free (deposit->url);
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GNUNET_free (deposit->json_enc);
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GNUNET_free (deposit);
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}
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/* end of mint_api_deposit.c */
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