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MisskeyIO/src/web/app/boot.js

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/**
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* MISSKEY BOOT LOADER
* (ENTRY POINT)
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*/
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/**
* ドメインに基づいて適切なスクリプトを読み込みます
* ユーザーの言語およびモバイル端末か否かも考慮します
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* webpackは介さないためrequireやimportは使えません
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*/
'use strict';
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{
// Get the current url information
const url = new URL(location.href);
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// Extarct the (sub) domain part of the current url
//
// e.g.
// misskey.alice => misskey
// misskey.strawberry.pasta => misskey
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// dev.misskey.arisu.tachibana => dev
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let app = url.host.split('.')[0];
// Detect the user language
// Note: The default language is English
let lang = navigator.language.split('-')[0];
if (!/^(en|ja)$/.test(lang)) lang = 'en';
// Detect the user agent
const ua = navigator.userAgent.toLowerCase();
const isMobile = /mobile|iphone|ipad|android/.test(ua);
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// Get the <head> element
const head = document.getElementsByTagName('head')[0];
// If mobile, insert the viewport meta tag
if (isMobile) {
const meta = document.createElement('meta');
meta.setAttribute('name', 'viewport');
meta.setAttribute('content', [
['width', 'device-width'],
['initial-scale', '1'],
['minimum-scale', '1'],
['maximum-scale', '1'],
['user-scalable', 'no']
].map(x => x.join('=')).join(','));
head.appendChild(meta);
}
// Switch desktop or mobile version
if (app == 'misskey') {
app = isMobile ? 'mobile' : 'desktop';
}
// Load an app script
// Note: 'async' make it possible to load the script asyncly.
// 'defer' make it possible to run the script when the dom loaded.
const script = document.createElement('script');
script.setAttribute('src', `/assets/${app}.${VERSION}.${lang}.js`);
script.setAttribute('async', 'true');
script.setAttribute('defer', 'true');
head.appendChild(script);
}