return new global fees from /keys

1 files changed, 368 insertions, 0 deletions

diff --git a/src/lib/exchange_api_reserves_history.c b/src/lib/exchange_api_reserves_history.c
new file mode 100644
index 000000000..f7191b2ad
--- /dev/null
+++ b/src/lib/exchange_api_reserves_history.c
@@ -0,0 +1,368 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2014-2022 Taler Systems SA
+
+  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, see
+  <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file lib/exchange_api_reserves_history.c
+ * @brief Implementation of the POST /reserves/$RESERVE_PUB/history requests
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <jansson.h>
+#include <microhttpd.h> /* just for HTTP history codes */
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_json_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_exchange_service.h"
+#include "taler_json_lib.h"
+#include "exchange_api_handle.h"
+#include "taler_signatures.h"
+#include "exchange_api_curl_defaults.h"
+
+
+/**
+ * @brief A /reserves/$RID/history Handle
+ */
+struct TALER_EXCHANGE_ReservesHistoryHandle
+{
+
+  /**
+   * The connection to exchange this request handle will use
+   */
+  struct TALER_EXCHANGE_Handle *exchange;
+
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Context for #TEH_curl_easy_post(). Keeps the data that must
+   * persist for Curl to make the upload.
+   */
+  struct TALER_CURL_PostContext post_ctx;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_EXCHANGE_ReservesHistoryCallback cb;
+
+  /**
+   * Public key of the reserve we are querying.
+   */
+  struct TALER_ReservePublicKeyP reserve_pub;
+
+  /**
+   * Closure for @a cb.
+   */
+  void *cb_cls;
+
+};
+
+
+/**
+ * We received an #MHD_HTTP_OK history code. Handle the JSON
+ * response.
+ *
+ * @param rgh handle of the request
+ * @param j JSON response
+ * @return #GNUNET_OK on success
+ */
+static enum GNUNET_GenericReturnValue
+handle_reserves_history_ok (struct TALER_EXCHANGE_ReservesHistoryHandle *rgh,
+                            const json_t *j)
+{
+  json_t *history;
+  unsigned int len;
+  bool kyc_ok;
+  bool kyc_required;
+  struct TALER_Amount balance;
+  struct TALER_Amount balance_from_history;
+  struct GNUNET_JSON_Specification spec[] = {
+    TALER_JSON_spec_amount_any ("balance",
+                                &balance),
+    GNUNET_JSON_spec_bool ("kyc_passed",
+                           &kyc_ok),
+    GNUNET_JSON_spec_bool ("kyc_required",
+                           &kyc_required),
+    GNUNET_JSON_spec_json ("history",
+                           &history),
+    GNUNET_JSON_spec_end ()
+  };
+  struct TALER_EXCHANGE_HttpResponse hr = {
+    .reply = j,
+    .http_history = MHD_HTTP_OK
+  };
+
+  if (GNUNET_OK !=
+      GNUNET_JSON_parse (j,
+                         spec,
+                         NULL,
+                         NULL))
+  {
+    GNUNET_break_op (0);
+    return GNUNET_SYSERR;
+  }
+  len = json_array_size (history);
+  {
+    struct TALER_EXCHANGE_ReserveHistory *rhistory;
+
+    rhistory = GNUNET_new_array (len,
+                                 struct TALER_EXCHANGE_ReserveHistory);
+    if (GNUNET_OK !=
+        TALER_EXCHANGE_parse_reserve_history (rgh->exchange,
+                                              history,
+                                              &rgh->reserve_pub,
+                                              balance.currency,
+                                              &balance_from_history,
+                                              len,
+                                              rhistory))
+    {
+      GNUNET_break_op (0);
+      TALER_EXCHANGE_free_reserve_history (rhistory,
+                                           len);
+      GNUNET_JSON_parse_free (spec);
+      return GNUNET_SYSERR;
+    }
+    if (0 !=
+        TALER_amount_cmp (&balance_from_history,
+                          &balance))
+    {
+      /* exchange cannot add up balances!? */
+      GNUNET_break_op (0);
+      TALER_EXCHANGE_free_reserve_history (rhistory,
+                                           len);
+      GNUNET_JSON_parse_free (spec);
+      return GNUNET_SYSERR;
+    }
+    if (NULL != rgh->cb)
+    {
+      rgh->cb (rgh->cb_cls,
+               &hr,
+               &balance,
+               len,
+               rhistory);
+      rgh->cb = NULL;
+    }
+    TALER_EXCHANGE_free_reserve_history (rhistory,
+                                         len);
+  }
+  GNUNET_JSON_parse_free (spec);
+  return GNUNET_OK;
+}
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /reserves/$RID/history request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_ReservesHistoryHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_reserves_history_finished (void *cls,
+                                  long response_code,
+                                  const void *response)
+{
+  struct TALER_EXCHANGE_ReservesHistoryHandle *rgh = cls;
+  const json_t *j = response;
+  struct TALER_EXCHANGE_HttpResponse hr = {
+    .reply = j,
+    .http_history = (unsigned int) response_code
+  };
+
+  rgh->job = NULL;
+  switch (response_code)
+  {
+  case 0:
+    hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
+    break;
+  case MHD_HTTP_OK:
+    if (GNUNET_OK !=
+        handle_reserves_history_ok (rgh,
+                                    j))
+    {
+      hr.http_history = 0;
+      hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+    }
+    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 */
+    GNUNET_break (0);
+    hr.ec = TALER_JSON_history_error_code (j);
+    hr.hint = TALER_JSON_history_error_hint (j);
+    break;
+  case MHD_HTTP_FORBIDDEN:
+    /* This should never happen, either us or the exchange is buggy
+       (or API version conflict); just pass JSON reply to the application */
+    GNUNET_break (0);
+    hr.ec = TALER_JSON_history_error_code (j);
+    hr.hint = TALER_JSON_history_error_hint (j);
+    break;
+  case MHD_HTTP_NOT_FOUND:
+    /* Nothing really to verify, this should never
+       happen, we should pass the JSON reply to the application */
+    hr.ec = TALER_JSON_history_error_code (j);
+    hr.hint = TALER_JSON_history_error_hint (j);
+    break;
+  case MHD_HTTP_INTERNAL_SERVER_ERROR:
+    /* Server had an internal issue; we should retry, but this API
+       leaves this to the application */
+    hr.ec = TALER_JSON_history_error_code (j);
+    hr.hint = TALER_JSON_history_error_hint (j);
+    break;
+  default:
+    /* unexpected response code */
+    GNUNET_break_op (0);
+    hr.ec = TALER_JSON_history_error_code (j);
+    hr.hint = TALER_JSON_history_error_hint (j);
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Unexpected response code %u/%d for reserves history\n",
+                (unsigned int) response_code,
+                (int) hr.ec);
+    break;
+  }
+  if (NULL != rgh->cb)
+  {
+    rgh->cb (rgh->cb_cls,
+             &hr,
+             NULL,
+             0,
+             NULL);
+    rgh->cb = NULL;
+  }
+  TALER_EXCHANGE_reserves_history_cancel (rgh);
+}
+
+
+struct TALER_EXCHANGE_ReservesHistoryHandle *
+TALER_EXCHANGE_reserves_history (
+  struct TALER_EXCHANGE_Handle *exchange,
+  const struct TALER_ReservePrivateKeyP *reserve_priv,
+  TALER_EXCHANGE_ReservesHistoryCallback cb,
+  void *cb_cls)
+{
+  struct TALER_EXCHANGE_ReservesHistoryHandle *rgh;
+  struct GNUNET_CURL_Context *ctx;
+  CURL *eh;
+  char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32];
+  const struct TALER_Amount *history_fee;
+  const struct TALER_EXCHANGE_Keys *keys;
+  struct GNUNET_TIME_Timestamp ts
+    = GNUNET_TIME_timestamp_get ();
+
+  if (GNUNET_YES !=
+      TEAH_handle_is_ready (exchange))
+  {
+    GNUNET_break (0);
+    return NULL;
+  }
+  keys = TALER_EXCHANGE_get_keys (exchange);
+  // FIXME: extract history_fee from keys!
+  history_fee = FIXME;
+  rgh = GNUNET_new (struct TALER_EXCHANGE_ReservesHistoryHandle);
+  rgh->exchange = exchange;
+  rgh->cb = cb;
+  rgh->cb_cls = cb_cls;
+  GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
+                                      &rgh->reserve_pub.eddsa_pub);
+  {
+    char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
+    char *end;
+
+    end = GNUNET_STRINGS_data_to_string (
+      &rgh->reserve_pub,
+      sizeof (rgh->reserve_pub),
+      pub_str,
+      sizeof (pub_str));
+    *end = '\0';
+    GNUNET_snprintf (arg_str,
+                     sizeof (arg_str),
+                     "/reserves/%s/history",
+                     pub_str);
+  }
+  rgh->url = TEAH_path_to_url (exchange,
+                               arg_str);
+  if (NULL == rgh->url)
+  {
+    GNUNET_free (rgh);
+    return NULL;
+  }
+  eh = TALER_EXCHANGE_curl_easy_history_ (rgh->url);
+  if (NULL == eh)
+  {
+    GNUNET_break (0);
+    GNUNET_free (rgh->url);
+    GNUNET_free (rgh);
+    return NULL;
+  }
+  TALER_wallet_reserve_history_sign (ts,
+                                     history_fee,
+                                     reserve_priv,
+                                     &reserve_sig);
+  {
+    json_t *history_obj = GNUNET_JSON_PACK (
+      GNUNET_JSON_pack_timestamp ("request_timestamp",
+                                  &ts),
+      GNUNET_JSON_pack_data_auto ("reserve_sig",
+                                  &reserve_sig));
+
+    if (GNUNET_OK !=
+        TALER_curl_easy_post (&rgh->post_ctx,
+                              eh,
+                              history_obj))
+      )
+      {
+        GNUNET_break (0);
+        curl_easy_cleanup (eh);
+        json_decref (history_obj);
+        GNUNET_free (rgh->url);
+        GNUNET_free (rgh);
+        return NULL;
+      }
+      json_decref (history_obj);
+  }
+  ctx = TEAH_handle_to_context (exchange);
+  rgh->job = GNUNET_CURL_job_add (ctx,
+                                  eh,
+                                  &handle_reserves_history_finished,
+                                  rgh);
+  return rgh;
+}
+
+
+void
+TALER_EXCHANGE_reserves_history_cancel (
+  struct TALER_EXCHANGE_ReservesHistoryHandle *rgh)
+{
+  if (NULL != rgh->job)
+  {
+    GNUNET_CURL_job_cancel (rgh->job);
+    rgh->job = NULL;
+  }
+  TALER_curl_easy_post_finished (&rgh->post_ctx);
+  GNUNET_free (rgh->url);
+  GNUNET_free (rgh);
+}
+
+
+/* end of exchange_api_reserves_history.c */