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<?php
/*
  This file is part of GNU TALER.
  Copyright (C) 2014, 2015, 2016 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.  If not, If not, see <http://www.gnu.org/licenses/>
*/

  include("../../copylib/merchants.php");
  include("../../copylib/util.php");
  include("../../copylib/config.php");
  include("./blog_lib.php");
  $article = get($_GET['article']);
  if (null == $article){
    echo message_from_missing_param("article", "/");
    die();
    }
  // send contract
  $transaction_id = rand(0, 1001);
  $now = new DateTime('now');
  $teaser = get_title($article);
  $amount_value = 0;
  $amount_fraction = 50000;
  $teatax = array ();
  $transaction_id = rand(0, 1001);
  $fulfillment_url = url_rel("essay_fulfillment.php")
    . '&timestamp=' . $now->getTimestamp()
    . '&tid=' . $transaction_id;

  $contract_json = generate_contract(array(
    "amount_value" => $amount_value,
    "amount_fraction" => $amount_fraction,
    "currency" => $MERCHANT_CURRENCY,
    "refund_delta" => $REFUND_DELTA,
    "transaction_id" => $transaction_id,
    "description" => trim($teaser),
    "merchant_name" => "Free Software Foundation (demo)",
    "product_id" => $article,
    "correlation_id" => $article,
    "taxes" => $teatax,
    "now" => $now,
    "fulfillment_url" => $fulfillment_url)
  );
  $resp = give_to_backend("backend/contract",
  	                  $contract_json);
  $status_code = $resp->getResponseCode();
  http_response_code ($status_code);
  if ($status_code != 200){
    echo json_encode(array(
      'error' => "internal error",
      'hint' => "backend indicated error",
      'detail' => $resp->body->toString()
    ), JSON_PRETTY_PRINT);
  }
  else {
    $got_json = json_decode($resp->body->toString(), true);
    $hc = $got_json["H_contract"];
    session_start();
    $payments = &pull($_SESSION, "payments", array());
    $payments[$article] = array("ispayed" => false);
    echo $resp->body->toString();
  }
?>