refactor: create function to read admin SDK JSON

src/controllers/token/index.ts

@@ -1,11 +1,8 @@
 import { OpenAPIHono, createRoute, z } from "@hono/zod-openapi";
 import { env } from "hono/adapter";
-import mapKeys from "lodash.mapkeys";
 
-import { Case, changeStringCase } from "~/libs/changeStringCase";
-import type { AdminSdkCredentials } from "~/libs/gcloud/getGoogleAuthToken";
+import { getAdminSdkCredentials } from "~/libs/gcloud/getAdminSdkCredentials";
 import { verifyFcmToken } from "~/libs/gcloud/verifyFcmToken";
-import { readEnvVariable } from "~/libs/readEnvVariable";
 import { saveToken } from "~/models/token";
 import type { Env } from "~/types/env";
 import {
@@ -73,10 +70,7 @@ app.openapi(route, async (c) => {
   try {
     const isValidToken = await verifyFcmToken(
       token,
-      mapKeys(
-        readEnvVariable<AdminSdkCredentials>(c.env, "ADMIN_SDK_JSON"),
-        (_, key) => changeStringCase(key, Case.snake_case, Case.camelCase),
-      ) as unknown as AdminSdkCredentials,
+      getAdminSdkCredentials(c.env),
     );
     if (!isValidToken) {
       return c.json(ErrorResponse, 401);