i18n

Author: jamesdaniels

package.json

@@ -1,6 +1,6 @@
 {
   "name": "firebase-frameworks",
-  "version": "0.9.0",
+  "version": "0.10.0",
   "description": "Experimental addon to the Firebase CLI to add web framework support",
   "main": "dist/index.js",
   "repository": "FirebaseExtended/firebase-framework-tools",
@@ -44,6 +44,10 @@
     ".": {
       "node": "./dist/index.js",
       "default": null
+    },
+    "./i18n": {
+      "node": "./dist/i18n.js",
+      "default": null
     }
   },
   "files": [

src/i18n.ts

@@ -0,0 +1,38 @@
+import { Request } from "firebase-functions/v2/https";
+
+export function getPreferredLocale(req: Request, locales: string[], defaultLocale: string): string {
+  const country = req.headers["x-country-code"] || ""
+  const languages = languagesByPreference(req.headers["accept-language"]);
+  const localesByHostingOOO: string[] = [];
+  if (country) {
+    for (const language of languages) {
+        localesByHostingOOO.push(`${language}_${country}`);
+    }
+    localesByHostingOOO.push(`ALL_${country}`);
+  }
+  for (const language of languages) {
+    localesByHostingOOO.push(`${language}_ALL`);
+    localesByHostingOOO.push(`${language}`);
+  }
+  return localesByHostingOOO.find(it => locales.includes(it)) || defaultLocale;
+}
+
+function languagesByPreference(acceptLanguage: string|undefined): string[] {
+  if (!acceptLanguage) {
+    return [];
+  }
+
+  const languagesSeen = new Set<string>();
+  const languagesOrdered: string[] = [];
+  for (const v of acceptLanguage.split(",")) {
+    const l = v.split("-")[0];
+    if (!l) {
+      continue;
+    }
+    if (!languagesSeen.has(l)) {
+      languagesOrdered.push(l);
+    }
+    languagesSeen.add(l);
+  }
+  return languagesOrdered;
+}

tsconfig.json

@@ -12,6 +12,7 @@
   },
   "include": [
     "src/index.ts",
+    "src/i18n.ts",
     "src/firebase-aware.ts",
     "src/*/index.ts",
     "src/*/firebase-aware.ts",