initial

src/langs/lang.ts

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+import path from 'path';
+import fs from 'fs';
+import { NextFunction, Request, Response } from 'express';
+
+interface LanguageValue {
+    success_insert?: string;
+    success_update?: string;
+    success_delete?: string;
+    success_restore?: string;
+    success_view?: string;
+    success?: string;
+    success_valid_otp?: string;
+
+    failed?: string;
+    failed_access?: string;
+    failed_access_otp?: string;
+    failed_expired_otp?: string;
+    failed_access_pin?: string;
+    failed_try_pin?: string;
+    failed_insert?: string;
+    failed_update?: string;
+    failed_delete?: string;
+    failed_restore?: string;
+    failed_save?: string;
+    failed_view?: string;
+    failed_empty?: string;
+    failed_data?: string;
+    failed_duplicate?: string;
+    failed_not_found?: string;
+    failed_limit_otp?: string;
+    failed_limit_link_code?: string;
+    failed_expired_token?: string;
+    failed_token?: string;
+    failed_add_point?: string;
+
+    //login
+    success_login?: string;
+    failed_password?: string;
+}
+
+export class Language {
+    static lang_init: LanguageValue = {};
+    static lang: LanguageValue = {};
+
+    static setup() {
+        const fileLang: any = fs.readFileSync(
+            path.join(__dirname, '../langs/json/en.json')
+        );
+        Language.lang_init['en'] = JSON.parse(fileLang.toString('utf8'));
+    }
+
+    static apply = (req: Request, res: Response, next: NextFunction) => {
+        const acceptLanguageHeader = req.get('Accept-Language') as string | null;
+        if (!acceptLanguageHeader) {
+            //default
+            req.params.language = 'en';
+        } else {
+            req.params.language = acceptLanguageHeader.substring(0, 2).toLowerCase();
+        }
+
+        Language.lang = Language.lang_init[req.params.language];
+
+        return next();
+    }
+}