/*
	Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
	Copyright (C) 2023 Spacebar and Spacebar Contributors
	
	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero 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 Affero General Public License for more details.
	
	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

import { Config } from "@spacebar/util";

export interface hcaptchaResponse {
    success: boolean;
    challenge_ts: string;
    hostname: string;
    credit: boolean;
    "error-codes": string[];
    score: number; // enterprise only
    score_reason: string[]; // enterprise only
}

export interface recaptchaResponse {
    success: boolean;
    score: number; // between 0 - 1
    action: string;
    challenge_ts: string;
    hostname: string;
    "error-codes"?: string[];
}

const verifyEndpoints = {
    hcaptcha: "https://hcaptcha.com/siteverify",
    recaptcha: "https://www.google.com/recaptcha/api/siteverify",
};

export async function verifyCaptcha(response: string, ip?: string) {
    const { security } = Config.get();
    const { service, secret, sitekey } = security.captcha;

    if (!service || !secret || !sitekey) throw new Error("CAPTCHA is not configured correctly. https://docs.spacebar.chat/setup/server/security/captcha/");

    const res = await fetch(verifyEndpoints[service], {
        method: "POST",
        headers: {
            "Content-Type": "application/x-www-form-urlencoded",
        },
        body:
            `response=${encodeURIComponent(response)}` +
            `&secret=${encodeURIComponent(secret)}` +
            `&sitekey=${encodeURIComponent(sitekey)}` +
            (ip ? `&remoteip=${encodeURIComponent(ip)}` : ""),
    });

    return (await res.json()) as hcaptchaResponse | recaptchaResponse;
}