diff options
Diffstat (limited to 'src/mint-lib/mint_api_refresh_link.c')
-rw-r--r-- | src/mint-lib/mint_api_refresh_link.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/src/mint-lib/mint_api_refresh_link.c b/src/mint-lib/mint_api_refresh_link.c new file mode 100644 index 000000000..3ea6b23e4 --- /dev/null +++ b/src/mint-lib/mint_api_refresh_link.c @@ -0,0 +1,236 @@ +/* + This file is part of TALER + Copyright (C) 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 + <http://www.gnu.org/licenses/> +*/ +/** + * @file mint-lib/mint_api_refresh_link.c + * @brief Implementation of the /refresh/link request of the mint's HTTP API + * @author Christian Grothoff + */ +#include "platform.h" +#include <curl/curl.h> +#include <jansson.h> +#include <microhttpd.h> /* just for HTTP status codes */ +#include <gnunet/gnunet_util_lib.h> +#include "taler_mint_service.h" +#include "mint_api_json.h" +#include "mint_api_context.h" +#include "mint_api_handle.h" +#include "taler_signatures.h" + + +/** + * @brief A /refresh/link Handle + */ +struct TALER_MINT_RefreshLinkHandle +{ + + /** + * The connection to mint this request handle will use + */ + struct TALER_MINT_Handle *mint; + + /** + * The url for this request. + */ + char *url; + + /** + * JSON encoding of the request to POST. + */ + char *json_enc; + + /** + * Handle for the request. + */ + struct MAC_Job *job; + + /** + * Function to call with the result. + */ + TALER_MINT_RefreshLinkCallback link_cb; + + /** + * Closure for @e cb. + */ + void *link_cb_cls; + + /** + * Download buffer + */ + struct MAC_DownloadBuffer db; + +}; + + +/** + * Function called when we're done processing the + * HTTP /refresh/link request. + * + * @param cls the `struct TALER_MINT_RefreshLinkHandle` + * @param eh the curl request handle + */ +static void +handle_refresh_link_finished (void *cls, + CURL *eh) +{ + struct TALER_MINT_RefreshLinkHandle *rlh = cls; + long response_code; + json_t *json; + + rlh->job = NULL; + json = MAC_download_get_result (&rlh->db, + eh, + &response_code); + switch (response_code) + { + case 0: + break; + case MHD_HTTP_OK: + GNUNET_break (0); // FIXME: NOT implemented! + // rh->link_cb = NULL; (call with real result, do not call again below) + 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_NOT_FOUND: + /* Nothing really to verify, mint says this coin was not melted; 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", + response_code); + GNUNET_break (0); + response_code = 0; + break; + } + if (NULL != rlh->link_cb) + rlh->link_cb (rlh->link_cb_cls, + response_code, + 0, NULL, NULL, + json); + json_decref (json); + TALER_MINT_refresh_link_cancel (rlh); +} + + +/** + * Submit a link request to the mint and get the mint's response. + * + * This API is typically not used by anyone, it is more a threat + * against those trying to receive a funds transfer by abusing the + * /refresh protocol. + * + * @param mint the mint handle; the mint must be ready to operate + * @param coin_priv private key to request link data for + * @param link_cb the callback to call with the useful result of the + * refresh operation the @a coin_priv was involved in (if any) + * @param link_cb_cls closure for @a link_cb + * @return a handle for this request + */ +struct TALER_MINT_RefreshLinkHandle * +TALER_MINT_refresh_link (struct TALER_MINT_Handle *mint, + const struct TALER_CoinSpendPrivateKeyP *coin_priv, + TALER_MINT_RefreshLinkCallback link_cb, + void *link_cb_cls) +{ + json_t *link_obj; + struct TALER_MINT_RefreshLinkHandle *rlh; + CURL *eh; + struct TALER_MINT_Context *ctx; + + if (GNUNET_YES != + MAH_handle_is_ready (mint)) + { + GNUNET_break (0); + return NULL; + } + /* FIXME: totally bogus request building here: */ + link_obj = json_pack ("{s:o, s:O}", /* f/wire */ + "4", 42, + "6", 62); + + + rlh = GNUNET_new (struct TALER_MINT_RefreshLinkHandle); + rlh->mint = mint; + rlh->link_cb = link_cb; + rlh->link_cb_cls = link_cb_cls; + + rlh->url = MAH_path_to_url (mint, "/refresh/link"); + + eh = curl_easy_init (); + GNUNET_assert (NULL != (rlh->json_enc = + json_dumps (link_obj, + JSON_COMPACT))); + json_decref (link_obj); + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_URL, + rlh->url)); + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_POSTFIELDS, + rlh->json_enc)); + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_POSTFIELDSIZE, + strlen (rlh->json_enc))); + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_WRITEFUNCTION, + &MAC_download_cb)); + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_WRITEDATA, + &rlh->db)); + ctx = MAH_handle_to_context (mint); + rlh->job = MAC_job_add (ctx, + eh, + GNUNET_YES, + &handle_refresh_link_finished, + rlh); + return rlh; +} + + +/** + * Cancel a refresh link request. This function cannot be used + * on a request handle if the callback was already invoked. + * + * @param rlh the refresh link handle + */ +void +TALER_MINT_refresh_link_cancel (struct TALER_MINT_RefreshLinkHandle *rlh) +{ + if (NULL != rlh->job) + { + MAC_job_cancel (rlh->job); + rlh->job = NULL; + } + GNUNET_free_non_null (rlh->db.buf); + GNUNET_free (rlh->url); + GNUNET_free (rlh->json_enc); + GNUNET_free (rlh); +} + + +/* end of mint_api_refresh_link.c */ |