/*******************************************************************************

    ηMatrix - a browser extension to black/white list requests.
    Copyright (C) 2014-2019 The uMatrix/uBlock Origin authors
    Copyright (C) 2019-2020 Alessio Vanni

    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/}.

    Home: https://libregit.spks.xyz/heckyel/ematrix
    uMatrix Home: https://github.com/gorhill/uMatrix
*/

'use strict';

Components.utils.import('chrome://ematrix/content/lib/UriTools.jsm');

var EXPORTED_SYMBOLS = ['CookieCache', 'CookieUtils'];

var junkyard = [];
var dict = new Map();

var CookieEntry = function (cookie) {
    this.usedOn = new Set();
    this.init(cookie);
};

CookieEntry.prototype.init = function (cookie) {
    this.secure = cookie.secure;
    this.session = cookie.session;
    this.anySubdomain = cookie.domain.charAt(0) === '.';
    this.hostname = this.anySubdomain ? cookie.domain.slice(1) : cookie.domain;
    this.domain = UriTools.domainFromHostname(this.hostname) || this.hostname;
    this.path = cookie.path;
    this.name = cookie.name;
    this.value = cookie.value;
    this.tstamp = Date.now();
    this.usedOn.clear();
    return this;
};

CookieEntry.prototype.dispose = function () {
    this.hostname = '';
    this.domain = '';
    this.path = '';
    this.name = '';
    this.value = '';
    this.usedOn.clear();
    return this;
};

var CookieUtils = {
    keyFromCookie: function (cookie) {
        let cb = [];

        cb[0] = cookie.secure ? 'https' : 'http';
        cb[1] = '://';
        cb[2] = cookie.domain.charAt(0) === '.' ?
            cookie.domain.slice(1) :
            cookie.domain;
        cb[3] = cookie.path;
        cb[4] = '{';
        cb[5] = cookie.session ? 'session' : 'persistent';
        cb[6] = '-cookie:';
        cb[7] = cookie.name;
        cb[8] = '}';

        return cb.join('');
    },
    keyFromURL: function (url, type, name) {
        if (typeof url !== 'object') {
            throw new Error('Invalid URL parameter');
        }

        let cb = [];

        cb[0] = url.scheme;
        cb[1] = '://';
        cb[2] = url.hostname;
        cb[3] = url.path;
        cb[4] = '{';
        cb[5] = type;
        cb[6] = '-cookie:';
        cb[7] = name;
        cb[8] = '}';

        return cb.join('');
    },
    urlFromEntry: function (entry) {
        if (!entry) {
            return '';
        }

        return (entry.secure ? 'https://' : 'http://')
            + entry.hostname
            + entry.path;
    },
    matchDomains: function (key, allHosts) {
        let entry = CookieCache.get(key);

        if (entry === undefined) {
            return false;
        }

        if (allHosts.indexOf(' '+entry.hostname+' ') < 0) {
            if (!entry.anySubdomain) {
                return false;
            }

            if (allHosts.indexOf('.'+entry.hostname+' ') < 0) {
                return false;
            }
        }

        return true;
    },
};

var CookieCache = {
    add: function (cookie) {
        let key = CookieUtils.keyFromCookie(cookie);
        let value = dict.get(key);

        if (value === undefined) {
            value = junkyard.pop();
            if (value) {
                value.init(cookie);
            } else {
                value = new CookieEntry(cookie);
            }
            dict.set(key, value);
        }

        return value;
    },
    addVector: function (vector) {
        for (let i=vector.length-1; i>=0; --i) {
            CookieCache.add(vector[i]);
        }
    },
    remove: function (cookie) {
        let value = dict.get(cookie);
        if (value === undefined) {
            return false;
        }

        dict.delete(cookie);

        if (junkyard.length < 25) {
            junkyard.push(value.dispose());
        }

        return true;
    },
    get: function (key) {
        return dict.get(key);
    },
    keys: function () {
        return dict.keys();
    }
};