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+/* SPDX-License-Identifier: CC0-1.0
+ *
+ * Part of Hacktcha, a free/libre front-end for reCAPTCHA for use with Haketilo.
+ *
+ * Copyright (C) 2022 Wojtek Kosior
+ *
+ * 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.
+ */
+
+/* Use with https://google.com/recaptcha/api2/demo */
+
+/* Load captcha-parent.js first. */
+
+(async () => {
+    if (document.getElementsByClassName("recaptcha-success").length > 0)
+	return;
+
+    const demo_div = document.getElementById("recaptcha-demo");
+    const demo_site_key = demo_div.getAttribute("data-sitekey");
+
+    while (demo_div.nextElementSibling !== null)
+	demo_div.nextElementSibling.remove();
+
+    const token = await HCHA.run(demo_div, demo_site_key);
+
+    console.debug("parent got token", token);
+
+    const token_field = document.createElement("textarea");
+
+    demo_div.after(token_field);
+
+    token_field.name = "g-recaptcha-response";
+    token_field.style.display = "none";
+    token_field.value = token;
+})();