skeleton for /track/transfer and /track/transaction, renaming to match latest exchange API

1 files changed, 193 insertions, 0 deletions

diff --git a/src/lib/merchant_api_track_transaction.c b/src/lib/merchant_api_track_transaction.c
new file mode 100644
index 00000000..356c0852
--- /dev/null
+++ b/src/lib/merchant_api_track_transaction.c
@@ -0,0 +1,193 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2014, 2015, 2016 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, If not, see
+  <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file lib/merchant_api_track_transaction.c
+ * @brief Implementation of the /track/transaction request of the
+ * merchant's HTTP API
+ * @author Marcello Stanisci
+ * @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 <gnunet/gnunet_curl_lib.h>
+#include "taler_merchant_service.h"
+#include <taler/taler_json_lib.h>
+#include <taler/taler_signatures.h>
+
+
+/**
+ * @brief A handle for tracking transactions.
+ */
+struct TALER_MERCHANT_TrackTransactionHandle
+{
+
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * base32 identifier being the 'witd' parameter required by the
+   * exchange
+   */
+  char *wtid;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_MERCHANT_TrackTransactionCallback cb;
+
+  /**
+   * Closure for @a cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Reference to the execution context.
+   */
+  struct GNUNET_CURL_Context *ctx;
+};
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /track/transaction request.
+ *
+ * @param cls the `struct TALER_MERCHANT_TrackTransactionHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param json response body, NULL if not in JSON
+ */
+static void
+handle_tracktransaction_finished (void *cls,
+                              long response_code,
+                              const json_t *json)
+{
+  struct TALER_MERCHANT_TrackTransactionHandle *tdo = cls;
+
+  tdo->job = NULL;
+  switch (response_code)
+  {
+  case 0:
+    break;
+  case MHD_HTTP_OK:
+    {
+    /* Work out argument for external callback from the body .. */
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "200 returned from /track/transaction\n");
+    /* FIXME: actually verify signature */
+    }
+    break;
+  case MHD_HTTP_NOT_FOUND:
+    /* Nothing really to verify, this should never
+       happen, we should pass the JSON reply to the application */
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "track transaction URI not found\n");
+    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;
+    break;
+  }
+  /* FIXME: figure out which parameters ought to be passed back */
+  tdo->cb (tdo->cb_cls,
+           response_code,
+           json);
+}
+
+
+/**
+ * Request backend to return transactions associated with a given wtid.
+ *
+ * @param ctx execution context
+ * @param backend_uri URI of the backend (having "/track/transaction" appended)
+ * @param wtid base32 string indicating a wtid
+ * @param exchange base URL of the exchange in charge of returning the wanted information
+ * @param track_transaction_cb the callback to call when a reply for this request is available
+ * @param track_transaction_cb_cls closure for @a contract_cb
+ * @return a handle for this request
+ */
+struct TALER_MERCHANT_TrackTransactionHandle *
+TALER_MERCHANT_track_transaction (struct GNUNET_CURL_Context *ctx,
+                                  const char *backend_uri,
+                                  uint64_t transaction_id,
+                                  const char *exchange_uri,
+                                  TALER_MERCHANT_TrackTransactionCallback track_transaction_cb,
+                                  void *track_transaction_cb_cls)
+{
+  struct TALER_MERCHANT_TrackTransactionHandle *tdo;
+  CURL *eh;
+
+  tdo = GNUNET_new (struct TALER_MERCHANT_TrackTransactionHandle);
+  tdo->ctx = ctx;
+  tdo->cb = track_transaction_cb;
+  tdo->cb_cls = track_transaction_cb_cls;
+  /* URI gotten with /track/transaction already appended... */
+  GNUNET_asprintf (&tdo->url,
+                   "%s?transaction=%llu&exchange=%s",
+                   backend_uri,
+                   (unsigned long long) transaction_id,
+                   exchange_uri);
+  eh = curl_easy_init ();
+  GNUNET_assert (CURLE_OK ==
+                 curl_easy_setopt (eh,
+                                   CURLOPT_URL,
+                                   tdo->url));
+  tdo->job = GNUNET_CURL_job_add (ctx,
+                                  eh,
+                                  GNUNET_YES,
+                                  &handle_tracktransaction_finished,
+                                  tdo);
+  return tdo;
+}
+
+
+/**
+ * Cancel a /track/transaction request.  This function cannot be used
+ * on a request handle if a response is already served for it.
+ *
+ * @param co the transaction's tracking handle
+ */
+void
+TALER_MERCHANT_track_transaction_cancel (struct TALER_MERCHANT_TrackTransactionHandle *tdo)
+{
+  if (NULL != tdo->job)
+  {
+    GNUNET_CURL_job_cancel (tdo->job);
+    tdo->job = NULL;
+  }
+  GNUNET_free (tdo->url);
+  GNUNET_free (tdo->wtid);
+  GNUNET_free (tdo);
+}
+
+/* end of merchant_api_track_transaction.c */