wallet-core/lib/wallet/helpers.ts

/*
 This file is part of TALER
 (C) 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, see <http://www.gnu.org/licenses/>
 */


/**
 * Smaller helper functions that do not depend
 * on the emscripten machinery.
 *
 * @author Florian Dold
 */

import {AmountJson} from "./types";

export function substituteFulfillmentUrl(url: string, vars) {
  url = url.replace("${H_contract}", vars.H_contract);
  url = url.replace("${$}", "$");
  return url;
}


export function amountToPretty(amount: AmountJson): string {
  let x = amount.value + amount.fraction / 1e6;
  return `${x} ${amount.currency}`;
}


/**
 * Canonicalize a base url, typically for the exchange.
 *
 * See http://api.taler.net/wallet.html#general
 */
export function canonicalizeBaseUrl(url) {
  let x = new URI(url);
  if (!x.protocol()) {
    x.protocol("https");
  }
  x.path(x.path() + "/").normalizePath();
  x.fragment();
  x.query();
  return x.href()
}


export function parsePrettyAmount(pretty: string): AmountJson {
  const res = /([0-9]+)(.[0-9]+)?\s*(\w+)/.exec(pretty);
  if (!res) {
    return null;
  }
  return {
    value: parseInt(res[1], 10),
    fraction: res[2] ? (parseFloat(`0.${res[2]}`) * 1e-6) : 0,
    currency: res[3]
  }
}