1 files changed, 140 insertions, 0 deletions
diff --git a/src/helpers.ts b/src/helpers.ts
new file mode 100644
index 000000000..26cd350ee
--- /dev/null
+++ b/src/helpers.ts
@@ -0,0 +1,140 @@
+/*
+ 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
+ */
+
+/// <reference path="../decl/urijs/URIjs.d.ts" />
+
+import {AmountJson} from "./types";
+import URI = uri.URI;
+
+export function substituteFulfillmentUrl(url: string, vars: any) {
+  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} ${amount.currency}`;
+}
+
+
+/**
+ * Canonicalize a base url, typically for the exchange.
+ *
+ * See http://api.taler.net/wallet.html#general
+ */
+export function canonicalizeBaseUrl(url: string) {
+  let x: URI = new URI(url);
+  if (!x.protocol()) {
+    x.protocol("https");
+  }
+  x.path(x.path() + "/").normalizePath();
+  x.fragment();
+  x.query();
+  return x.href()
+}
+
+
+export function parsePrettyAmount(pretty: string): AmountJson|undefined {
+  const res = /([0-9]+)(.[0-9]+)?\s*(\w+)/.exec(pretty);
+  if (!res) {
+    return undefined;
+  }
+  return {
+    value: parseInt(res[1], 10),
+    fraction: res[2] ? (parseFloat(`0.${res[2]}`) * 1e-6) : 0,
+    currency: res[3]
+  }
+}
+
+
+
+/**
+ * Convert object to JSON with canonical ordering of keys
+ * and whitespace omitted.
+ */
+export function canonicalJson(obj: any): string {
+  // Check for cycles, etc.
+  JSON.stringify(obj);
+  if (typeof obj == "string" || typeof obj == "number" || obj === null) {
+    return JSON.stringify(obj)
+  }
+  if (Array.isArray(obj)) {
+    let objs: string[] = obj.map((e) => canonicalJson(e));
+    return `[${objs.join(',')}]`;
+  }
+  let keys: string[] = [];
+  for (let key in obj) {
+    keys.push(key);
+  }
+  keys.sort();
+  let s = "{";
+  for (let i = 0; i < keys.length; i++) {
+    let key = keys[i];
+    s += JSON.stringify(key) + ":" + canonicalJson(obj[key]);
+    if (i != keys.length - 1) {
+      s += ",";
+    }
+  }
+  return s + "}";
+}
+
+
+export function deepEquals(x: any, y: any): boolean {
+  if (x === y) {
+    return true;
+  }
+
+  if (Array.isArray(x) && x.length !== y.length) {
+    return false;
+  }
+
+  var p = Object.keys(x);
+  return Object.keys(y).every((i) => p.indexOf(i) !== -1) &&
+    p.every((i) => deepEquals(x[i], y[i]));
+}
+
+
+export function flatMap<T, U>(xs: T[], f: (x: T) => U[]): U[] {
+  return xs.reduce((acc: U[], next: T) => [...f(next), ...acc], []);
+}
+
+
+export function getTalerStampSec(stamp: string): number | null {
+  const m = stamp.match(/\/?Date\(([0-9]*)\)\/?/);
+  if (!m) {
+    return null;
+  }
+  return parseInt(m[1]);
+}
+
+
+export function getTalerStampDate(stamp: string): Date | null {
+  let sec = getTalerStampSec(stamp);
+  if (sec == null) {
+    return null;
+  }
+  return new Date(sec * 1000);
+}
+