/*
This file is part of TALER
Copyright (C) 2014-2017 GNUnet e.V. and INRIA
TALER is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1,
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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with TALER; see the file COPYING.LGPL. If not,
see
*/
/**
* @file lib/merchant_api_proposal.c
* @brief Implementation of the /proposal POST and GET
* @author Christian Grothoff
* @author Marcello Stanisci
*/
#include "platform.h"
#include
#include
#include /* just for HTTP status codes */
#include
#include
#include "taler_merchant_service.h"
#include
#include
#include
/**
* @brief A Contract Operation Handle
*/
struct TALER_MERCHANT_ProposalOperation
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_ProposalCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
/**
* Minor context that holds body and headers.
*/
struct TEAH_PostContext post_ctx;
};
/**
* Structure representing a GET /proposal operation.
*/
struct TALER_MERCHANT_ProposalLookupOperation
{
/**
* Full URL, includes "/proposal".
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_ProposalLookupOperationCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
/**
* Should we send the lookup operation with a nonce?
*/
int has_nonce;
/**
* Nonce, only initialized if has_nonce is GNUNET_YES.
*/
struct GNUNET_CRYPTO_EddsaPublicKey nonce;
};
/**
* Function called when we're done processing the
* HTTP POST /proposal request.
*
* @param cls the `struct TALER_MERCHANT_ProposalOperation`
* @param response_code HTTP response code, 0 on error
* @param json response body, NULL if not JSON
*/
static void
handle_proposal_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_ProposalOperation *po = cls;
const char *order_id;
const json_t *json = response;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("order_id",
&order_id),
GNUNET_JSON_spec_end()
};
po->job = NULL;
switch (response_code)
{
case 0:
po->cb (po->cb_cls,
response_code,
TALER_EC_INVALID_RESPONSE,
json,
order_id);
TALER_MERCHANT_proposal_cancel (po);
return;
case MHD_HTTP_OK:
{
if (GNUNET_OK !=
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
response_code = 0;
break;
}
}
break;
case MHD_HTTP_BAD_REQUEST:
/* This should never happen, either us or
the merchant is buggy (or API version conflict);
just pass JSON reply to the application */
break;
case MHD_HTTP_FORBIDDEN:
break;
case MHD_HTTP_UNAUTHORIZED:
/* Nothing really to verify, merchant 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:
/* 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_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u\n",
(unsigned int) response_code);
GNUNET_break (0);
response_code = 0;
}
po->cb (po->cb_cls,
response_code,
TALER_JSON_get_error_code (json),
json,
order_id);
GNUNET_JSON_parse_free (spec);
TALER_MERCHANT_proposal_cancel (po);
}
/**
* POST an order to the backend and receives the related proposal.
*
* @param ctx execution context
* @param backend_url URL of the backend
* @param order basic information about this purchase,
* to be extended by the backend
* @param proposal_cb the callback to call when a reply
* for this request is available
* @param proposal_cb_cls closure for @a proposal_cb
* @return a handle for this request, NULL on error
*/
struct TALER_MERCHANT_ProposalOperation *
TALER_MERCHANT_order_put
(struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const json_t *order,
TALER_MERCHANT_ProposalCallback proposal_cb,
void *proposal_cb_cls)
{
struct TALER_MERCHANT_ProposalOperation *po;
json_t *req;
CURL *eh;
po = GNUNET_new (struct TALER_MERCHANT_ProposalOperation);
po->ctx = ctx;
po->cb = proposal_cb;
po->cb_cls = proposal_cb_cls;
po->url = TALER_url_join (backend_url, "/order", NULL);
req = json_pack ("{s:O}",
"order", (json_t *) order);
eh = curl_easy_init ();
if (GNUNET_OK != TALER_curl_easy_post (&po->post_ctx,
eh,
req))
{
GNUNET_break (0);
GNUNET_free (po);
return NULL;
}
json_decref (req);
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
po->url));
po->job = GNUNET_CURL_job_add2 (ctx,
eh,
po->post_ctx.headers,
&handle_proposal_finished,
po);
return po;
}
/**
* Function called when we're done processing the GET /proposal request.
*
* @param cls the `struct TALER_MERCHANT_ProposalLookupOperation`
* @param response_code HTTP response code, 0 on error
* @param json response body, should be NULL
*/
static void
handle_proposal_lookup_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_ProposalLookupOperation *plo = cls;
json_t *contract_terms;
struct TALER_MerchantSignatureP sig;
struct GNUNET_HashCode hash;
const json_t *json = response;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_json ("contract_terms",
&contract_terms),
GNUNET_JSON_spec_fixed_auto ("sig",
&sig),
GNUNET_JSON_spec_end()
};
plo->job = NULL;
if (MHD_HTTP_OK != response_code)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Proposal lookup failed with HTTP status code %u\n",
(unsigned int) response_code);
GNUNET_break (0);
plo->cb (plo->cb_cls,
response_code,
json,
NULL,
NULL,
NULL);
TALER_MERCHANT_proposal_lookup_cancel (plo);
return;
}
if (GNUNET_OK !=
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"proposal lookup failed to parse JSON\n");
GNUNET_break_op (0);
plo->cb (plo->cb_cls,
0,
json,
NULL,
NULL,
NULL);
TALER_MERCHANT_proposal_lookup_cancel (plo);
return;
}
if (GNUNET_OK !=
TALER_JSON_hash (contract_terms,
&hash))
{
GNUNET_break (0);
GNUNET_JSON_parse_free (spec);
plo->cb (plo->cb_cls,
0,
json,
NULL,
NULL,
NULL);
TALER_MERCHANT_proposal_lookup_cancel (plo);
return;
}
plo->job = NULL;
/**
* As no data is supposed to be extracted from this
* call, we just invoke the provided callback.
*/
plo->cb (plo->cb_cls,
response_code,
json,
contract_terms,
&sig,
&hash);
GNUNET_JSON_parse_free (spec);
TALER_MERCHANT_proposal_lookup_cancel (plo);
}
/**
* Calls the GET /proposal API at the backend. That is,
* retrieve a proposal data by providing its transaction id.
*
* @param ctx execution context
* @param backend_url base URL of the merchant backend
* @param order_id order id used to perform the lookup
* @param nonce nonce used to perform the lookup
* @param plo_cb callback which will work the response gotten from the backend
* @param plo_cb_cls closure to pass to @a history_cb
* @return handle for this operation, NULL upon errors
*/
struct TALER_MERCHANT_ProposalLookupOperation *
TALER_MERCHANT_proposal_lookup (struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const char *order_id,
const char *instance,
const struct GNUNET_CRYPTO_EddsaPublicKey *nonce,
TALER_MERCHANT_ProposalLookupOperationCallback plo_cb,
void *plo_cb_cls)
{
struct TALER_MERCHANT_ProposalLookupOperation *plo;
CURL *eh;
char *base;
plo = GNUNET_new (struct TALER_MERCHANT_ProposalLookupOperation);
plo->ctx = ctx;
plo->cb = plo_cb;
plo->cb_cls = plo_cb_cls;
base = TALER_url_join (backend_url, "/public/proposal", NULL);
if (NULL != nonce)
{
char *nonce_str;
plo->has_nonce = GNUNET_YES;
plo->nonce = *nonce;
nonce_str = GNUNET_STRINGS_data_to_string_alloc (nonce, sizeof (struct GNUNET_CRYPTO_EddsaPublicKey));
GNUNET_assert (NULL != nonce_str);
GNUNET_asprintf (&plo->url,
"%s?order_id=%s&instance=%s&nonce=%s",
base,
order_id,
instance,
nonce_str);
GNUNET_free (nonce_str);
}
else
{
GNUNET_asprintf (&plo->url,
"%s?order_id=%s&instance=%s",
base,
order_id,
instance);
}
GNUNET_free (base);
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"looking up proposal from %s\n",
plo->url);
eh = curl_easy_init ();
if (CURLE_OK != curl_easy_setopt (eh,
CURLOPT_URL,
plo->url))
{
GNUNET_break (0);
return NULL;
}
if (NULL == (plo->job = GNUNET_CURL_job_add (ctx,
eh,
GNUNET_YES,
&handle_proposal_lookup_finished,
plo)))
{
GNUNET_break (0);
return NULL;
}
return plo;
}
/**
* Cancel a POST /proposal request. This function cannot be used
* on a request handle if a response is already served for it.
*
* @param po the proposal operation request handle
*/
void
TALER_MERCHANT_proposal_cancel
(struct TALER_MERCHANT_ProposalOperation *po)
{
if (NULL != po->job)
{
GNUNET_CURL_job_cancel (po->job);
po->job = NULL;
}
GNUNET_free (po->url);
TALER_curl_easy_post_finished (&po->post_ctx);
GNUNET_free (po);
}
/**
* Cancel a GET /proposal request.
*
* @param plo handle to the request to be canceled
*/
void
TALER_MERCHANT_proposal_lookup_cancel
(struct TALER_MERCHANT_ProposalLookupOperation *plo)
{
if (NULL != plo->job)
{
GNUNET_CURL_job_cancel (plo->job);
plo->job = NULL;
}
GNUNET_free (plo->url);
GNUNET_free (plo);
}
/* end of merchant_api_contract.c */