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path: root/src/backend/taler-merchant-httpd_private-get-orders.c
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/*
  This file is part of TALER
  (C) 2019, 2020 Taler Systems SA

  TALER is free software; you can redistribute it and/or modify it under the
  terms of the GNU Affero 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 taler-merchant-httpd_private-get-orders.c
 * @brief implement GET /orders
 * @author Christian Grothoff
 */
#include "platform.h"
#include "taler-merchant-httpd_private-get-orders.h"
#include <taler/taler_json_lib.h>


/**
 * Stores state for adding an order to the array for the response.
 */
struct AddOrderState
{
  /**
   * The array of orders.
   */
  json_t *pa;

  /**
   * The name of the instance we are querying for.
   */
  const char *instance_id;

  /**
   * The result after adding the orders (#TALER_EC_NONE for okay, anything else for an error).
   */
  enum TALER_ErrorCode result;

};


/**
 * A pending GET /orders request that is in long polling mode.
 */
struct TMH_PendingOrder
{

  /**
   * Kept in a DLL.
   */
  struct TMH_PendingOrder *prev;

  /**
   * Kept in a DLL.
   */
  struct TMH_PendingOrder *next;

  /**
   * Which connection was suspended.
   */
  struct MHD_Connection *con;

  /**
   * Associated heap node.
   */
  struct GNUNET_CONTAINER_HeapNode *hn;

  /**
   * Which instance is this client polling? This also defines
   * which DLL this struct is part of.
   */
  struct TMH_MerchantInstance *mi;

  /**
   * At what time does this request expire? If set in the future, we
   * may wait this long for a payment to arrive before responding.
   */
  struct GNUNET_TIME_Absolute long_poll_timeout;

  /**
   * State for adding orders. The array `pa` must be
   * json_decref()'ed when done with the `struct TMH_PendingOrder`!
   */
  struct AddOrderState *aos;

  /**
   * Filter to apply.
   */
  struct TALER_MERCHANTDB_OrderFilter of;
};


/**
 * Task to timeout pending orders.
 */
static struct GNUNET_SCHEDULER_Task *order_timeout_task;

/**
 * Heap for orders in long polling awaiting timeout.
 */
static struct GNUNET_CONTAINER_Heap *order_timeout_heap;


/**
 * We are shutting down (or an instance is being deleted), force resume of all
 * GET /orders requests.
 *
 * @param mi instance to force resuming for
 */
void
TMH_force_get_orders_resume (struct TMH_MerchantInstance *mi)
{
  struct TMH_PendingOrder *po;

  while (NULL != (po = mi->po_head))
  {
    GNUNET_CONTAINER_DLL_remove (mi->po_head,
                                 mi->po_tail,
                                 po);
    GNUNET_assert (po ==
                   GNUNET_CONTAINER_heap_remove_root (order_timeout_heap));
    MHD_resume_connection (po->con);
    json_decref (po->aos->pa);
    GNUNET_free (po);
  }
  if (NULL != order_timeout_task)
  {
    GNUNET_SCHEDULER_cancel (order_timeout_task);
    order_timeout_task = NULL;
  }
  if (NULL != order_timeout_heap)
  {
    GNUNET_CONTAINER_heap_destroy (order_timeout_heap);
    order_timeout_heap = NULL;
  }
}


/**
 * Task run to trigger timeouts on GET /orders requests with long polling.
 *
 * @param cls unused
 */
static void
order_timeout (void *cls)
{
  struct TMH_PendingOrder *po;
  struct TMH_MerchantInstance *mi;

  (void) cls;
  order_timeout_task = NULL;
  while (1)
  {
    po = GNUNET_CONTAINER_heap_peek (order_timeout_heap);
    if (NULL == po)
    {
      /* release data structure, we don't need it right now */
      GNUNET_CONTAINER_heap_destroy (order_timeout_heap);
      order_timeout_heap = NULL;
      return;
    }
    if  (0 !=
         GNUNET_TIME_absolute_get_remaining (
           po->long_poll_timeout).rel_value_us)
      break;
    GNUNET_assert (po ==
                   GNUNET_CONTAINER_heap_remove_root (order_timeout_heap));
    po->hn = NULL;
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Resuming long polled job due to timeout\n");
    mi = po->mi;
    GNUNET_CONTAINER_DLL_remove (mi->po_head,
                                 mi->po_tail,
                                 po);
    json_decref (po->aos->pa);
    MHD_resume_connection (po->con);
    TMH_trigger_daemon ();   /* we resumed, kick MHD */
    GNUNET_free (po);
  }
  order_timeout_task = GNUNET_SCHEDULER_add_at (po->long_poll_timeout,
                                                &order_timeout,
                                                NULL);
}


/**
 * Cleanup our "context", where we stored the JSON array
 * we are building for the response.
 *
 * @param ctx context to clean up, must be a `struct AddOrderState *`
 */
static void
cleanup (void *ctx)
{
  struct AddOrderState *aos = ctx;
  json_decref (aos->pa);
  GNUNET_free (aos);
}


/**
 * Function called with information about a refund.
 * It is responsible for summing up the refund amount.
 *
 * @param cls closure
 * @param refund_serial unique serial number of the refund
 * @param timestamp time of the refund (for grouping of refunds in the wallet UI)
 * @param coin_pub public coin from which the refund comes from
 * @param exchange_url URL of the exchange that issued @a coin_pub
 * @param rtransaction_id identificator of the refund
 * @param reason human-readable explanation of the refund
 * @param refund_amount refund amount which is being taken from @a coin_pub
 * @param pending true if the this refund was not yet processed by the wallet/exchange
 */
static void
process_refunds_cb (void *cls,
                    uint64_t refund_serial,
                    struct GNUNET_TIME_Absolute timestamp,
                    const struct TALER_CoinSpendPublicKeyP *coin_pub,
                    const char *exchange_url,
                    uint64_t rtransaction_id,
                    const char *reason,
                    const struct TALER_Amount *refund_amount,
                    bool pending)
{
  struct TALER_Amount *total_refund_amount = cls;

  GNUNET_assert (0 <=
                 TALER_amount_add (total_refund_amount,
                                   total_refund_amount,
                                   refund_amount));
}


/**
 * Add order details to our JSON array.
 *
 * @param[in,out] cls a `json_t *` JSON array to build
 * @param order_id ID of the order
 * @param order_serial serial ID of the order
 * @param creation_time when was the order created
 */
static void
add_order (void *cls,
           const char *order_id,
           uint64_t order_serial,
           struct GNUNET_TIME_Absolute creation_time)
{
  struct AddOrderState *aos = cls;
  json_t *contract_terms;
  struct GNUNET_HashCode h_contract_terms;
  enum GNUNET_DB_QueryStatus qs;
  bool refundable = false;
  bool paid;

  {
    qs = TMH_db->lookup_order_status (TMH_db->cls,
                                      aos->instance_id,
                                      order_id,
                                      &h_contract_terms,
                                      &paid);
    /* qs == 0: contract terms don't exist, so the order cannot be paid. */
    if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
      paid = false;
    if (qs < 0)
    {
      GNUNET_break (0);
      aos->result = TALER_EC_GENERIC_DB_FETCH_FAILED;
      return;
    }
  }

  if (paid)
  {
    /* if the order was paid, it must have been claimed, so use
       lookup_contract_terms to avoid the order being deleted in the db. */
    uint64_t os;

    qs = TMH_db->lookup_contract_terms (TMH_db->cls,
                                        aos->instance_id,
                                        order_id,
                                        &contract_terms,
                                        &os);
  }
  else
  {
    struct GNUNET_HashCode unused;

    qs = TMH_db->lookup_order (TMH_db->cls,
                               aos->instance_id,
                               order_id,
                               NULL,
                               &unused,
                               &contract_terms);
  }

  if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT != qs)
  {
    GNUNET_break (0);
    aos->result = TALER_EC_GENERIC_DB_FETCH_FAILED;
    json_decref (contract_terms);
    return;
  }

  {
    struct TALER_Amount order_amount;
    struct GNUNET_TIME_Absolute rd;

    struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();

    struct GNUNET_JSON_Specification spec[] = {
      TALER_JSON_spec_amount ("amount",
                              &order_amount),
      GNUNET_JSON_spec_absolute_time ("refund_deadline",
                                      &rd),
      GNUNET_JSON_spec_end ()
    };

    if (GNUNET_OK !=
        GNUNET_JSON_parse (contract_terms,
                           spec,
                           NULL, NULL))
    {
      GNUNET_break (0);
      aos->result = TALER_EC_MERCHANT_GENERIC_DB_CONTRACT_CONTENT_INVALID;
      json_decref (contract_terms);
      return;
    }

    if ((now.abs_value_us <= rd.abs_value_us) &&
        paid)
    {
      struct TALER_Amount refund_amount;

      GNUNET_assert (GNUNET_OK ==
                     TALER_amount_get_zero (TMH_currency,
                                            &refund_amount));
      qs = TMH_db->lookup_refunds_detailed (TMH_db->cls,
                                            aos->instance_id,
                                            &h_contract_terms,
                                            &process_refunds_cb,
                                            &refund_amount);
      if (0 > qs)
      {
        GNUNET_break (0);
        aos->result = TALER_EC_GENERIC_DB_FETCH_FAILED;
        json_decref (contract_terms);
        return;
      }
      if (0 > TALER_amount_cmp (&refund_amount,
                                &order_amount))
        refundable = true;
    }
  }

  GNUNET_assert (0 ==
                 json_array_append_new (
                   aos->pa,
                   json_pack (
                     "{s:s, s:I, s:o, s:O, s:O, s:b, s:b}",
                     "order_id",
                     order_id,
                     "row_id",
                     (json_int_t) order_serial,
                     "timestamp",
                     GNUNET_JSON_from_time_abs (creation_time),
                     "amount",
                     json_object_get (contract_terms,
                                      "amount"),
                     "summary",
                     json_object_get (contract_terms,
                                      "summary"),
                     "refundable",
                     refundable,
                     "paid",
                     paid)));
  json_decref (contract_terms);
}


/**
 * There has been a change or addition of a new @a order_id.  Wake up
 * long-polling clients that may have been waiting for this event.
 *
 * @param mi the instance where the order changed
 * @param order_id the order that changed
 * @param paid is the order paid by the customer?
 * @param refunded was the order refunded?
 * @param wired was the merchant paid via wire transfer?
 * @param date execution date of the order
 * @param order_serial_id serial ID of the order in the database
 */
void
TMH_notify_order_change (struct TMH_MerchantInstance *mi,
                         const char *order_id,
                         bool paid,
                         bool refunded,
                         bool wired,
                         struct GNUNET_TIME_Absolute date,
                         uint64_t order_serial_id)
{
  struct TMH_PendingOrder *pn;

  for (struct TMH_PendingOrder *po = mi->po_head;
       NULL != po;
       po = pn)
  {
    pn = po->next;
    if (! ( ( ((TALER_EXCHANGE_YNA_YES == po->of.paid) == paid) ||
              (TALER_EXCHANGE_YNA_ALL == po->of.paid) ) &&
            ( ((TALER_EXCHANGE_YNA_YES == po->of.refunded) == refunded) ||
              (TALER_EXCHANGE_YNA_ALL == po->of.refunded) ) &&
            ( ((TALER_EXCHANGE_YNA_YES == po->of.wired) == wired) ||
              (TALER_EXCHANGE_YNA_ALL == po->of.wired) ) ) )
      continue;
    if (po->of.delta > 0)
    {
      if (order_serial_id < po->of.start_row)
        continue;
      if (date.abs_value_us < po->of.date.abs_value_us)
        continue;
      po->of.delta--;
    }
    else
    {
      if (order_serial_id > po->of.start_row)
        continue;
      if (date.abs_value_us > po->of.date.abs_value_us)
        continue;
      po->of.delta++;
    }
    add_order (po->aos,
               order_id,
               order_serial_id,
               date);
    GNUNET_CONTAINER_DLL_remove (mi->po_head,
                                 mi->po_tail,
                                 po);
    GNUNET_assert (po ==
                   GNUNET_CONTAINER_heap_remove_node (po->hn));
    MHD_resume_connection (po->con);
    TMH_trigger_daemon ();   /* we resumed, kick MHD */
    json_decref (po->aos->pa);
    GNUNET_free (po);
  }
}


/**
 * Handle a GET "/orders" request.
 *
 * @param rh context of the handler
 * @param connection the MHD connection to handle
 * @param[in,out] hc context with further information about the request
 * @return MHD result code
 */
MHD_RESULT
TMH_private_get_orders (const struct TMH_RequestHandler *rh,
                        struct MHD_Connection *connection,
                        struct TMH_HandlerContext *hc)
{
  struct AddOrderState *aos;
  enum GNUNET_DB_QueryStatus qs;
  struct TALER_MERCHANTDB_OrderFilter of;

  if (NULL != hc->ctx)
  {
    /* resumed from long-polling, return answer we already have
       in 'hc->ctx' */
    struct AddOrderState *aos = hc->ctx;

    if (TALER_EC_NONE != aos->result)
    {
      GNUNET_break (0);
      return TALER_MHD_reply_with_error (connection,
                                         MHD_HTTP_INTERNAL_SERVER_ERROR,
                                         aos->result,
                                         NULL);
    }
    return TALER_MHD_reply_json_pack (connection,
                                      MHD_HTTP_OK,
                                      "{s:O}",
                                      "orders", aos->pa);
  }

  if (! (TALER_arg_to_yna (connection,
                           "paid",
                           TALER_EXCHANGE_YNA_ALL,
                           &of.paid)) )
    return TALER_MHD_reply_with_error (connection,
                                       MHD_HTTP_BAD_REQUEST,
                                       TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                       "paid");
  if (! (TALER_arg_to_yna (connection,
                           "refunded",
                           TALER_EXCHANGE_YNA_ALL,
                           &of.refunded)) )
    return TALER_MHD_reply_with_error (connection,
                                       MHD_HTTP_BAD_REQUEST,
                                       TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                       "refunded");
  if (! (TALER_arg_to_yna (connection,
                           "wired",
                           TALER_EXCHANGE_YNA_ALL,
                           &of.wired)) )
    return TALER_MHD_reply_with_error (connection,
                                       MHD_HTTP_BAD_REQUEST,
                                       TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                       "wired");
  {
    const char *delta_str;

    delta_str = MHD_lookup_connection_value (connection,
                                             MHD_GET_ARGUMENT_KIND,
                                             "delta");
    if (NULL == delta_str)
    {
      of.delta = -20;
    }
    else
    {
      char dummy;
      long long ll;

      if (1 !=
          sscanf (delta_str,
                  "%lld%c",
                  &ll,
                  &dummy))
        return TALER_MHD_reply_with_error (connection,
                                           MHD_HTTP_BAD_REQUEST,
                                           TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                           "delta");
      of.delta = (uint64_t) ll;
    }
  }
  {
    const char *date_ms_str;

    date_ms_str = MHD_lookup_connection_value (connection,
                                               MHD_GET_ARGUMENT_KIND,
                                               "date_ms");
    if (NULL == date_ms_str)
    {
      if (of.delta > 0)
        of.date = GNUNET_TIME_UNIT_ZERO_ABS;
      else
        of.date = GNUNET_TIME_UNIT_FOREVER_ABS;
    }
    else
    {
      char dummy;
      unsigned long long ll;

      if (1 !=
          sscanf (date_ms_str,
                  "%llu%c",
                  &ll,
                  &dummy))
      {
        GNUNET_break_op (0);
        return TALER_MHD_reply_with_error (connection,
                                           MHD_HTTP_BAD_REQUEST,
                                           TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                           "date_ms");
      }
      of.date.abs_value_us = ll * GNUNET_TIME_UNIT_MILLISECONDS.rel_value_us;
      if (of.date.abs_value_us / GNUNET_TIME_UNIT_MILLISECONDS.rel_value_us !=
          ll)
      {
        /* overflow during multiplication detected */
        GNUNET_break_op (0);
        return TALER_MHD_reply_with_error (connection,
                                           MHD_HTTP_BAD_REQUEST,
                                           TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                           "date_ms");
      }
    }
  }
  {
    const char *start_row_str;

    start_row_str = MHD_lookup_connection_value (connection,
                                                 MHD_GET_ARGUMENT_KIND,
                                                 "start");
    if (NULL == start_row_str)
    {
      if (of.delta > 0)
        of.start_row = 0;
      else
        of.start_row = INT64_MAX;
    }
    else
    {
      char dummy[2];
      unsigned long long ull;

      if (1 !=
          sscanf (start_row_str,
                  "%llu%1s",
                  &ull,
                  dummy))
        return TALER_MHD_reply_with_error (connection,
                                           MHD_HTTP_BAD_REQUEST,
                                           TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                           "start");
      of.start_row = (uint64_t) ull;
    }
  }
  {
    const char *timeout_ms_str;

    timeout_ms_str = MHD_lookup_connection_value (connection,
                                                  MHD_GET_ARGUMENT_KIND,
                                                  "timeout_ms");
    if (NULL == timeout_ms_str)
    {
      of.timeout = GNUNET_TIME_UNIT_ZERO;
    }
    else
    {
      char dummy[2];
      unsigned long long ull;

      if (1 !=
          sscanf (timeout_ms_str,
                  "%lld%1s",
                  &ull,
                  dummy))
        return TALER_MHD_reply_with_error (connection,
                                           MHD_HTTP_BAD_REQUEST,
                                           TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                           "timeout_ms");
      of.timeout = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
                                                  ull);
    }
  }

  aos = GNUNET_new (struct AddOrderState);
  GNUNET_assert (NULL != aos);
  aos->pa = json_array ();
  aos->instance_id = hc->instance->settings.id;
  aos->result = TALER_EC_NONE;
  GNUNET_assert (NULL != aos->pa);
  {
    qs = TMH_db->lookup_orders (TMH_db->cls,
                                hc->instance->settings.id,
                                &of,
                                &add_order,
                                aos);
    if (0 > qs)
    {
      aos->result = TALER_EC_GENERIC_DB_FETCH_FAILED;
    }
    if (TALER_EC_NONE != aos->result)
    {
      enum TALER_ErrorCode aos_result = aos->result;

      GNUNET_break (0);
      json_decref (aos->pa);
      GNUNET_free (aos);
      return TALER_MHD_reply_with_error (connection,
                                         MHD_HTTP_INTERNAL_SERVER_ERROR,
                                         aos_result,
                                         NULL);
    }
  }
  if ( (0 == qs) &&
       (of.timeout.rel_value_us > 0) )
  {
    struct TMH_MerchantInstance *mi = hc->instance;
    struct TMH_PendingOrder *po;

    /* setup timeout heap (if not yet exists) */
    if (NULL == order_timeout_heap)
      order_timeout_heap
        = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
    hc->ctx = aos;
    hc->cc = &cleanup;
    po = GNUNET_new (struct TMH_PendingOrder);
    po->mi = mi;
    po->con = connection;
    po->aos = aos;
    json_incref (po->aos->pa);
    po->hn = GNUNET_CONTAINER_heap_insert (order_timeout_heap,
                                           po,
                                           po->long_poll_timeout.abs_value_us);
    po->long_poll_timeout = GNUNET_TIME_relative_to_absolute (of.timeout);
    po->of = of;
    GNUNET_CONTAINER_DLL_insert (mi->po_head,
                                 mi->po_tail,
                                 po);
    MHD_suspend_connection (connection);
    /* start timeout task */
    po = GNUNET_CONTAINER_heap_peek (order_timeout_heap);
    if (NULL != order_timeout_task)
      GNUNET_SCHEDULER_cancel (order_timeout_task);
    order_timeout_task = GNUNET_SCHEDULER_add_at (po->long_poll_timeout,
                                                  &order_timeout,
                                                  NULL);
    return MHD_YES;
  }
  {
    json_t *pa = aos->pa;
    GNUNET_free (aos);
    return TALER_MHD_reply_json_pack (connection,
                                      MHD_HTTP_OK,
                                      "{s:o}",
                                      "orders", pa);
  }
}


/* end of taler-merchant-httpd_private-get-orders.c */