"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    var desc = Object.getOwnPropertyDescriptor(m, k);
    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
      desc = { enumerable: true, get: function() { return m[k]; } };
    }
    Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
    __setModuleDefault(result, mod);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.errorHandler = exports.routerClosure = exports.requestFilter = exports.RedirectCidError = exports.NotEnabledError = void 0;
const swarmCid = __importStar(require("@ethersphere/swarm-cid"));
const logger_1 = require("./logger");
class NotEnabledError extends Error {
}
exports.NotEnabledError = NotEnabledError;
class RedirectCidError extends Error {
    constructor(message, cid) {
        super(message);
        this.newUrl = cid;
    }
}
exports.RedirectCidError = RedirectCidError;
/**
 * Function that evaluates if the request was made with subdomain.
 *
 * @param pathname
 * @param req
 */
function requestFilter(pathname, req) {
    return req.subdomains.length >= 1;
}
exports.requestFilter = requestFilter;
/**
 * Closure that routes subdomain CID/ENS to /bzz endpoint.
 *
 * @param target
 * @param isCidEnabled
 * @param isEnsEnabled
 */
function routerClosure(target, isCidEnabled, isEnsEnabled) {
    return (req) => {
        const bzzResource = subdomainToBzz(req, isCidEnabled, isEnsEnabled);
        logger_1.logger.debug(`bzz link proxy`, { hostname: req.hostname, bzzResource });
        return `${target}/bzz/${bzzResource}`;
    };
}
exports.routerClosure = routerClosure;
/**
 * Express error handler that handles BZZ link error cases.
 *
 * @param err
 * @param req
 * @param res
 * @param next
 */
function errorHandler(err, req, res, next) {
    if (res.headersSent) {
        next(err);
        return;
    }
    if (err instanceof NotEnabledError) {
        res.writeHead(500).end(`Error 500: ${err.message}`);
        return;
    }
    if (err instanceof RedirectCidError) {
        // Using Permanently Moved HTTP code for redirection
        res.redirect(301, err.newUrl);
        return;
    }
    next(err);
}
exports.errorHandler = errorHandler;
/**
 * Helper function that translates subdomain (CID/ENS) into Bzz resource
 *
 * @param req
 * @param isCidEnabled
 * @param isEnsEnabled
 */
function subdomainToBzz(req, isCidEnabled, isEnsEnabled) {
    const host = req.hostname.split('.');
    const subdomain = [...req.subdomains].reverse().join('.');
    try {
        const result = swarmCid.decodeCid(subdomain);
        if (!isCidEnabled) {
            logger_1.logger.warn('cid subdomain support disabled, but got cid', { subdomain });
            throw new NotEnabledError('CID subdomain support is disabled, but got a CID!');
        }
        // We got old CID redirect to new one with proper multicodec
        if (result.type === undefined) {
            host[0] = swarmCid.encodeManifestReference(result.reference).toString();
            const newUrl = `${req.protocol}://${host.join('.')}${req.originalUrl}`;
            logger_1.logger.info(`redirecting to new cid`, newUrl);
            throw new RedirectCidError('old CID format, redirect to new one', newUrl);
        }
        return result.reference;
    }
    catch (e) {
        if (e instanceof NotEnabledError || e instanceof RedirectCidError) {
            throw e;
        }
        if (!isEnsEnabled) {
            logger_1.logger.warn('ens subdomain support disabled, but got ens', { subdomain });
            throw new NotEnabledError('ENS subdomain support is disabled, but got an ENS domain!');
        }
        return `${subdomain}.eth`;
    }
}