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-rw-r--r--ext/js/background/environment.js92
1 files changed, 92 insertions, 0 deletions
diff --git a/ext/js/background/environment.js b/ext/js/background/environment.js
new file mode 100644
index 00000000..5e61a56d
--- /dev/null
+++ b/ext/js/background/environment.js
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2020-2021 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/>.
+ */
+
+
+class Environment {
+ constructor() {
+ this._cachedEnvironmentInfo = null;
+ }
+
+ async prepare() {
+ this._cachedEnvironmentInfo = await this._loadEnvironmentInfo();
+ }
+
+ getInfo() {
+ if (this._cachedEnvironmentInfo === null) { throw new Error('Not prepared'); }
+ return this._cachedEnvironmentInfo;
+ }
+
+ async _loadEnvironmentInfo() {
+ const browser = await this._getBrowser();
+ const os = await this._getOperatingSystem();
+ return {
+ browser,
+ platform: {os}
+ };
+ }
+
+ async _getOperatingSystem() {
+ try {
+ const {os} = await this._getPlatformInfo();
+ if (typeof os === 'string') {
+ return os;
+ }
+ } catch (e) {
+ // NOP
+ }
+ return 'unknown';
+ }
+
+ _getPlatformInfo() {
+ return new Promise((resolve, reject) => {
+ chrome.runtime.getPlatformInfo((result) => {
+ const error = chrome.runtime.lastError;
+ if (error) {
+ reject(error);
+ } else {
+ resolve(result);
+ }
+ });
+ });
+ }
+
+ async _getBrowser() {
+ 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') {
+ try {
+ const info = await browser.runtime.getBrowserInfo();
+ if (info.name === 'Fennec') {
+ return 'firefox-mobile';
+ }
+ } catch (e) {
+ // NOP
+ }
+ return 'firefox';
+ } else {
+ return 'chrome';
+ }
+ }
+}