var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
import ApplicationComponent from "../ApplicationComponent";
import onFinished from "on-finished";
import Logger from "../Logger";
import { ServerError } from "../HttpError";
export default class RedirectBackComponent extends ApplicationComponent {
    start(app, router) {
        return __awaiter(this, void 0, void 0, function* () {
            router.use((req, res, next) => {
                if (!req.session) {
                    throw new Error('Session is unavailable.');
                }
                onFinished(res, (err) => {
                    if (!err && res.statusCode === 200) {
                        req.session.previousUrl = req.originalUrl;
                        Logger.debug('Prev url set to', req.session.previousUrl);
                        req.session.save((err) => {
                            if (err) {
                                Logger.error(err, 'Error while saving session');
                            }
                        });
                    }
                });
                res.redirectBack = (defaultUrl) => {
                    if (req.session && typeof req.session.previousUrl === 'string') {
                        res.redirect(req.session.previousUrl);
                    }
                    else if (typeof defaultUrl === 'string') {
                        res.redirect(defaultUrl);
                    }
                    else {
                        throw new ServerError('There is no previous url and no default redirection url was provided.');
                    }
                };
                next();
            });
        });
    }
    stop() {
        return __awaiter(this, void 0, void 0, function* () {
        });
    }
}
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