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-rw-r--r--src/mint-lib/mint_api_refresh_link.c236
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 00000000..3ea6b23e
--- /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 */