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/* SPDX-License-Identifier: GPL-3.0-or-later
*
* 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 GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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
* GNU General Public License for more details.
*
* As additional permission under GNU GPL version 3 section 7, you
* may distribute forms of that code without the copy of the GNU
* GPL normally required by section 4, provided you include this
* license notice and, in case of non-source distribution, a URL
* through which recipients can access the Corresponding Source.
* If you modify file(s) with this exception, you may extend this
* exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* As a special exception to the GPL, any HTML file which merely
* makes function calls to this code, and for that purpose
* includes it by reference shall be deemed a separate work for
* copyright law purposes. If you modify this code, you may extend
* this exception to your version of the code, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*
* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
* license. Although I request that you do not make use of this code in a
* proprietary program, I am not going to enforce this in court.
*/
/* Use with https://google.com/recaptcha/api2/anchor */
"use strict";
/*
* reCAPTCHA uses a less common variant of base64 which we produce by slightly
* modifying the output of JavaScript's native base64 encoding routine.
*/
function rc_base64_decode(data_b64) {
data_b64 = data_b64
.replaceAll("-", "+")
.replaceAll("_", "/")
.replaceAll(".", "=");
return atob(data_b64);
}
const rc_params = new URLSearchParams(window.location.search);
const site_key = rc_params.get("k");
const rc_version = rc_params.get("v");
const lang = rc_params.get("hl") || "en";
const origin_b64 = rc_params.get("co");
const origin = rc_base64_decode(origin_b64);
const initial_token = document.getElementById("recaptcha-token").value;
const smuggled_data = {origin, initial_token};
const bframe_url = new URL("https://google.com/recaptcha/api2/bframe");
bframe_url.search = new URLSearchParams([
["hl", lang],
["v", rc_version],
["k", site_key]
]);
bframe_url.hash = encodeURIComponent(JSON.stringify(smuggled_data));
window.location.href = bframe_url;
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