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diff --git a/common/jsonschema/urllib_mock.js b/common/jsonschema/urllib_mock.js
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+/* SPDX-License-Identifier: MIT AND CC0-1.0
+ *
+ * This file is part of Haketilo.
+ *
+ * Function: Replacement for require('url') to use with jsonschema library.
+ *
+ * License for the resolve() function:
+ *
+ ***************************************
+ *
+ * Copyright Node.js contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ *******************************************************************************
+ *
+ * License notice for the rest of the file:
+ *
+ ***************************************
+ *
+ * Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the CC0 1.0 Universal License as published by
+ * the Creative Commons Corporation.
+ *
+ * This program 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
+ * CC0 1.0 Universal License for more details.
+ */
+
+/*
+ * The original jsonschema code used legacy resolve() function from
+ * require('url'). Here we define in a replacement for it.
+ */
+
+const dummy_host = 'haketilo.resolve.example.com';
+const dummy_prefix = `http://${dummy_host}/`;
+
+function resolve(from, to) {
+    const resolvedUrl = new URL(to, new URL(from, dummy_prefix));
+    if (resolvedUrl.hostname === dummy_host) {
+	// `from` is a relative URL.
+	const { pathname, search, hash } = resolvedUrl;
+	return pathname + search + hash;
+    }
+    return resolvedUrl.toString();
+}
+#EXPORT resolve
+
+function parse(url_string) {
+    if (arguments.length > 1)
+	throw "error: this is a mocked version of parse() that only accepts one argument";
+
+    return new URL(url_string);
+}
+#EXPORT parse