dbmedialab/reader-critics

//
// 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 { isEmpty } from 'lodash';
import { URL } from 'url';

import { EmptyError } from 'app/util/errors';

const containsHex = /(?:%3A|%2F)/i;  // Detect encoded ':' and '/' characters
const containsScheme = /^https?:\/\//;

export class ArticleURL {

    // readonly url : URL;
    readonly href : string;

    public static from(origURL : string) : Promise <ArticleURL> {
        return new Promise <ArticleURL> ((resolve, reject) => {
            try {
                return resolve(new ArticleURL(origURL));
            }
            catch (error) {
                return reject(error);
            }
        });
    }

    // Constructor

    constructor(origURL : string) {
        if (isEmpty(origURL)) {
            throw new EmptyError('Article URL is undefined or empty');
        }

        const decodedURL : string = containsHex.test(origURL)
            ? decodeURIComponent(origURL)
            : origURL;

        if (!containsScheme.test(decodedURL)) {
            throw new TypeError(`URL must begin with a HTTP(S) scheme (${decodedURL})`);
        }

        // this.url = new URL(decodedURL);
        this.href = new URL(decodedURL).toString();
    }

    // Accessors

    public toString() : string {
        return this.href;
    }

}

export default ArticleURL;