aboutsummaryrefslogtreecommitdiff
path: root/ext/js/extension/environment.js
blob: f4b5d0ac7b2353e569a6823e6fe92f99507370ae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
/*
 * Copyright (C) 2023-2024  Yomitan Authors
 * Copyright (C) 2020-2022  Yomichan Authors
 *
 * 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 <https://www.gnu.org/licenses/>.
 */

export class Environment {
    constructor() {
        /** @type {?import('environment').Info} */
        this._cachedEnvironmentInfo = null;
    }

    /**
     * @returns {Promise<void>}
     */
    async prepare() {
        this._cachedEnvironmentInfo = await this._loadEnvironmentInfo();
    }

    /**
     * @returns {import('environment').Info}
     * @throws {Error}
     */
    getInfo() {
        if (this._cachedEnvironmentInfo === null) { throw new Error('Not prepared'); }
        return this._cachedEnvironmentInfo;
    }

    /**
     * @returns {Promise<import('environment').Info>}
     */
    async _loadEnvironmentInfo() {
        const os = await this._getOperatingSystem();
        const browser = await this._getBrowser(os);

        return {
            browser,
            platform: {os},
        };
    }

    /**
     * @returns {Promise<import('environment').OperatingSystem>}
     */
    async _getOperatingSystem() {
        try {
            const {os} = await this._getPlatformInfo();
            if (typeof os === 'string') {
                return os;
            }
        } catch (e) {
            // NOP
        }
        return 'unknown';
    }

    /**
     * @returns {Promise<chrome.runtime.PlatformInfo>}
     */
    _getPlatformInfo() {
        return new Promise((resolve, reject) => {
            chrome.runtime.getPlatformInfo((result) => {
                const error = chrome.runtime.lastError;
                if (error) {
                    reject(error);
                } else {
                    resolve(result);
                }
            });
        });
    }

    /**
     * @param {import('environment').OperatingSystem} os
     * @returns {Promise<import('environment').Browser>}
     */
    async _getBrowser(os) {
        try {
            if (chrome.runtime.getURL('/').startsWith('ms-browser-extension://')) {
                return 'edge-legacy';
            }
            if (/\bEdge?\//.test(navigator.userAgent)) {
                return 'edge';
            }
        } catch (e) {
            // NOP
        }
        if (typeof browser !== 'undefined') {
            if (this._isSafari()) {
                return 'safari';
            }
            if (os === 'android') {
                return 'firefox-mobile';
            }
            return 'firefox';
        } else {
            return 'chrome';
        }
    }

    /**
     * @returns {boolean};
     */
    _isSafari() {
        const {vendor, userAgent} = navigator;
        return (
            typeof vendor === 'string' &&
            typeof userAgent === 'string' &&
            vendor.includes('Apple') &&
            !userAgent.includes('CriOS') &&
            !userAgent.includes('FxiOS')
        );
    }
}