src/app/routes/errorHandlers.ts from dbmedialab/reader-critics

src/app/routes/errorHandlers.ts
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//
// LESERKRITIKK v2 (aka Reader Critics)
// Copyright (C) 2017 DB Medialab/Aller Media AS, Oslo, Norway
// https://github.com/dbmedialab/reader-critics/
//
// 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.
//
// You should have received a copy of the GNU General Public License along with
// this program. If not, see <http://www.gnu.org/licenses/>.
//

import {
    Request,
    Response,
} from 'express';

import { localizationService } from 'app/services';

import {
    InvalidRequestError,
    NotFoundError,
} from 'app/util/errors';

import * as app from 'app/util/applib';

const log = app.createLog();
const __ = localizationService.translate;

export function notFoundHandler(requ : Request, resp : Response) {
    send404Response(resp);
}

export function catchAllErrorHandler(
    err : Error,
    requ : Request,
    resp : Response,
    next : Function
) {
    log(`Catch-all got one ${Object.getPrototypeOf(err)}: ${err.message}`);

    if (err instanceof InvalidRequestError) {
        send400Response(resp, err.message);
    }
    else if (err instanceof NotFoundError) {
        send404Response(resp, err.message);
    }
    else {
        resp.status(500).set('Content-Type', 'text/plain').send(err.stack);
    }
}

function send400Response(resp : Response, message? : string) {
    let template = badRequestPage;

    if (message) {
        template = template
        .replace(/#main-title#/g, __('err.invalid-requ'))
        .replace(/#main-message#/g, __('err.invalid-param'))
        .replace(/#message#/g, message);
    }

    resp.status(404).send(template);
}

function send404Response(resp : Response, message? : string) {
    const msg = message || 'Resource not found';
    const template = notFoundPage
        .replace(/#main-title#/g, __('err.not-found'))
        .replace(/#message#/g, msg);

    resp.status(404).send(template);
}

const badRequestPage = `<html>\
<head>\
    <title>#main-title#</title>\
</head>\
<body>\
    <h1>#main-title#</h1>\
    <h2>#main-message#</h2>\
    <h3>#message#</h3>\
</body>\
</html>`;

const notFoundPage = '<html>\
<head>\
    <title>#main-title#</title>\
</head>\
<body>\
    <h1>#main-title#</h1>\
    <h3>#message#</h3>\
</body>\
</html>';