rename source files to match API URIs

1 files changed, 369 insertions, 0 deletions

diff --git a/src/exchange-lib/exchange_api_track_transaction.c b/src/exchange-lib/exchange_api_track_transaction.c
new file mode 100644
index 000000000..e9c38e488
--- /dev/null
+++ b/src/exchange-lib/exchange_api_track_transaction.c
@@ -0,0 +1,369 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2014, 2015, 2016 GNUnet e.V.
+
+  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 exchange-lib/exchange_api_track_transaction.c
+ * @brief Implementation of the /track/transaction request of the exchange'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 <gnunet/gnunet_json_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_json_lib.h"
+#include "taler_exchange_service.h"
+#include "exchange_api_common.h"
+#include "exchange_api_handle.h"
+#include "taler_signatures.h"
+
+
+/**
+ * @brief A Deposit Wtid Handle
+ */
+struct TALER_EXCHANGE_TrackTransactionHandle
+{
+
+  /**
+   * The connection to exchange this request handle will use
+   */
+  struct TALER_EXCHANGE_Handle *exchange;
+
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * JSON encoding of the request to POST.
+   */
+  char *json_enc;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_EXCHANGE_TrackTransactionCallback cb;
+
+  /**
+   * Closure for @a cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Information the exchange should sign in response.
+   * (with pre-filled fields from the request).
+   */
+  struct TALER_ConfirmWirePS depconf;
+
+};
+
+
+/**
+ * Verify that the signature on the "200 OK" response
+ * from the exchange is valid.
+ *
+ * @param dwh deposit wtid handle
+ * @param json json reply with the signature
+ * @param[out] exchange_pub set to the exchange's public key
+ * @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
+ */
+static int
+verify_deposit_wtid_signature_ok (const struct TALER_EXCHANGE_TrackTransactionHandle *dwh,
+                                  const json_t *json,
+                                  struct TALER_ExchangePublicKeyP *exchange_pub)
+{
+  struct TALER_ExchangeSignatureP exchange_sig;
+  const struct TALER_EXCHANGE_Keys *key_state;
+  struct GNUNET_JSON_Specification spec[] = {
+    GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig),
+    GNUNET_JSON_spec_fixed_auto ("exchange_pub", exchange_pub),
+    GNUNET_JSON_spec_end()
+  };
+
+  if (GNUNET_OK !=
+      GNUNET_JSON_parse (json,
+                         spec,
+                         NULL, NULL))
+  {
+    GNUNET_break_op (0);
+    return GNUNET_SYSERR;
+  }
+  key_state = TALER_EXCHANGE_get_keys (dwh->exchange);
+  if (GNUNET_OK !=
+      TALER_EXCHANGE_test_signing_key (key_state,
+                                       exchange_pub))
+  {
+    GNUNET_break_op (0);
+    return GNUNET_SYSERR;
+  }
+  if (GNUNET_OK !=
+      GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE,
+                                  &dwh->depconf.purpose,
+                                  &exchange_sig.eddsa_signature,
+                                  &exchange_pub->eddsa_pub))
+  {
+    GNUNET_break_op (0);
+    return GNUNET_SYSERR;
+  }
+  return GNUNET_OK;
+}
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /track/transaction request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_TrackTransactionHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param json parsed JSON result, NULL on error
+ */
+static void
+handle_deposit_wtid_finished (void *cls,
+                              long response_code,
+                              const json_t *json)
+{
+  struct TALER_EXCHANGE_TrackTransactionHandle *dwh = cls;
+  const struct TALER_WireTransferIdentifierRawP *wtid = NULL;
+  struct GNUNET_TIME_Absolute execution_time = GNUNET_TIME_UNIT_FOREVER_ABS;
+  const struct TALER_Amount *coin_contribution = NULL;
+  struct TALER_Amount coin_contribution_s;
+  struct TALER_ExchangePublicKeyP exchange_pub;
+  struct TALER_ExchangePublicKeyP *ep = NULL;
+
+  dwh->job = NULL;
+  switch (response_code)
+  {
+  case 0:
+    break;
+  case MHD_HTTP_OK:
+    {
+      struct GNUNET_JSON_Specification spec[] = {
+        GNUNET_JSON_spec_fixed_auto ("wtid", &dwh->depconf.wtid),
+        GNUNET_JSON_spec_absolute_time ("execution_time", &execution_time),
+        TALER_JSON_spec_amount ("coin_contribution", &coin_contribution_s),
+        GNUNET_JSON_spec_end()
+      };
+
+      if (GNUNET_OK !=
+          GNUNET_JSON_parse (json,
+                             spec,
+                             NULL, NULL))
+      {
+        GNUNET_break_op (0);
+        response_code = 0;
+        break;
+      }
+      wtid = &dwh->depconf.wtid;
+      dwh->depconf.execution_time = GNUNET_TIME_absolute_hton (execution_time);
+      TALER_amount_hton (&dwh->depconf.coin_contribution,
+                         &coin_contribution_s);
+      coin_contribution = &coin_contribution_s;
+      if (GNUNET_OK !=
+          verify_deposit_wtid_signature_ok (dwh,
+                                            json,
+                                            &exchange_pub))
+      {
+        GNUNET_break_op (0);
+        response_code = 0;
+      }
+      else
+      {
+        ep = &exchange_pub;
+      }
+    }
+    break;
+  case MHD_HTTP_ACCEPTED:
+    {
+      /* Transaction known, but not executed yet */
+      struct GNUNET_JSON_Specification spec[] = {
+        GNUNET_JSON_spec_absolute_time ("execution_time", &execution_time),
+        GNUNET_JSON_spec_end()
+      };
+
+      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 exchange is buggy
+       (or API version conflict); just pass JSON reply to the application */
+    break;
+  case MHD_HTTP_UNAUTHORIZED:
+    /* Nothing really to verify, exchange 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:
+    /* Exchange does not know about transaction;
+       we should pass the 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;
+    break;
+  }
+  dwh->cb (dwh->cb_cls,
+           response_code,
+           ep,
+           json,
+           wtid,
+           execution_time,
+           coin_contribution);
+  TALER_EXCHANGE_track_transaction_cancel (dwh);
+}
+
+
+/**
+ * Obtain wire transfer details about an existing deposit operation.
+ *
+ * @param exchange the exchange to query
+ * @param merchant_priv the merchant's private key
+ * @param h_wire hash of merchant's wire transfer details
+ * @param h_contract hash of the contract
+ * @param coin_pub public key of the coin
+ * @param transaction_id transaction identifier
+ * @param cb function to call with the result
+ * @param cb_cls closure for @a cb
+ * @return handle to abort request
+ */
+struct TALER_EXCHANGE_TrackTransactionHandle *
+TALER_EXCHANGE_track_transaction (struct TALER_EXCHANGE_Handle *exchange,
+                             const struct TALER_MerchantPrivateKeyP *merchant_priv,
+                             const struct GNUNET_HashCode *h_wire,
+                             const struct GNUNET_HashCode *h_contract,
+                             const struct TALER_CoinSpendPublicKeyP *coin_pub,
+                             uint64_t transaction_id,
+                             TALER_EXCHANGE_TrackTransactionCallback cb,
+                             void *cb_cls)
+{
+  struct TALER_DepositTrackPS dtp;
+  struct TALER_MerchantSignatureP merchant_sig;
+  struct TALER_EXCHANGE_TrackTransactionHandle *dwh;
+  struct GNUNET_CURL_Context *ctx;
+  json_t *deposit_wtid_obj;
+  CURL *eh;
+
+  if (GNUNET_YES !=
+      MAH_handle_is_ready (exchange))
+  {
+    GNUNET_break (0);
+    return NULL;
+  }
+  dtp.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_TRACK_TRANSACTION);
+  dtp.purpose.size = htonl (sizeof (dtp));
+  dtp.h_contract = *h_contract;
+  dtp.h_wire = *h_wire;
+  dtp.transaction_id = GNUNET_htonll (transaction_id);
+  GNUNET_CRYPTO_eddsa_key_get_public (&merchant_priv->eddsa_priv,
+                                      &dtp.merchant.eddsa_pub);
+
+  dtp.coin_pub = *coin_pub;
+  GNUNET_assert (GNUNET_OK ==
+                 GNUNET_CRYPTO_eddsa_sign (&merchant_priv->eddsa_priv,
+                                           &dtp.purpose,
+                                           &merchant_sig.eddsa_sig));
+  deposit_wtid_obj = json_pack ("{s:o, s:o," /* H_wire, H_contract */
+                                " s:o, s:I," /* coin_pub, transaction_id */
+                                " s:o, s:o}", /* merchant_pub, merchant_sig */
+                                "H_wire", GNUNET_JSON_from_data_auto (h_wire),
+                                "H_contract", GNUNET_JSON_from_data_auto (h_contract),
+                                "coin_pub", GNUNET_JSON_from_data_auto (coin_pub),
+                                "transaction_id", (json_int_t) transaction_id,
+                                "merchant_pub", GNUNET_JSON_from_data_auto (&dtp.merchant),
+                                "merchant_sig", GNUNET_JSON_from_data_auto (&merchant_sig));
+
+  dwh = GNUNET_new (struct TALER_EXCHANGE_TrackTransactionHandle);
+  dwh->exchange = exchange;
+  dwh->cb = cb;
+  dwh->cb_cls = cb_cls;
+  dwh->url = MAH_path_to_url (exchange, "/track/transaction");
+  dwh->depconf.purpose.size = htonl (sizeof (struct TALER_ConfirmWirePS));
+  dwh->depconf.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE);
+  dwh->depconf.h_wire = *h_wire;
+  dwh->depconf.h_contract = *h_contract;
+  dwh->depconf.coin_pub = *coin_pub;
+  dwh->depconf.transaction_id = GNUNET_htonll (transaction_id);
+
+  eh = curl_easy_init ();
+  GNUNET_assert (NULL != (dwh->json_enc =
+                          json_dumps (deposit_wtid_obj,
+                                      JSON_COMPACT)));
+  json_decref (deposit_wtid_obj);
+  GNUNET_assert (CURLE_OK ==
+                 curl_easy_setopt (eh,
+                                   CURLOPT_URL,
+                                   dwh->url));
+  GNUNET_assert (CURLE_OK ==
+                 curl_easy_setopt (eh,
+                                   CURLOPT_POSTFIELDS,
+                                   dwh->json_enc));
+  GNUNET_assert (CURLE_OK ==
+                 curl_easy_setopt (eh,
+                                   CURLOPT_POSTFIELDSIZE,
+                                   strlen (dwh->json_enc)));
+  ctx = MAH_handle_to_context (exchange);
+  dwh->job = GNUNET_CURL_job_add (ctx,
+                          eh,
+                          GNUNET_YES,
+                          &handle_deposit_wtid_finished,
+                          dwh);
+  return dwh;
+}
+
+
+/**
+ * Cancel deposit wtid request.  This function cannot be used on a request
+ * handle if a response is already served for it.
+ *
+ * @param dwh the wire deposits request handle
+ */
+void
+TALER_EXCHANGE_track_transaction_cancel (struct TALER_EXCHANGE_TrackTransactionHandle *dwh)
+{
+  if (NULL != dwh->job)
+  {
+    GNUNET_CURL_job_cancel (dwh->job);
+    dwh->job = NULL;
+  }
+  GNUNET_free (dwh->url);
+  GNUNET_free (dwh->json_enc);
+  GNUNET_free (dwh);
+}
+
+
+/* end of exchange_api_deposit_wtid.c */