커스텀 제공자의 App Check 제공자 객체를 만듭니다. 이 객체에는 커스텀 App Check 제공자에서 신뢰성 증명에 필요한 정보를 수집하고 App Check 토큰과 교환하여 토큰 획득 서비스에 전송하는 getToken() 메서드가 있어야 합니다. App Check SDK는 토큰 캐싱을 처리하므로 항상 getToken() 구현에서 새 토큰을 가져옵니다.
Web
import{CustomProvider}from"firebase/app-check";constappCheckCustomProvider=newCustomProvider({getToken:()=>{returnnewPromise((resolve,_reject)=>{// TODO: Logic to exchange proof of authenticity for an App Check token and// expiration time.// ...constappCheckToken={token:tokenFromServer,expireTimeMillis:expirationFromServer*1000};resolve(appCheckToken);});}});
constappCheckCustomProvider={getToken:()=>{returnnewPromise((resolve,_reject)=>{// TODO: Logic to exchange proof of authenticity for an App Check token and// expiration time.// ...constappCheckToken={token:tokenFromServer,expireTimeMillis:expirationFromServer*1000};resolve(appCheckToken);});}};
import{initializeApp}from"firebase/app";import{initializeAppCheck}from"firebase/app-check";constapp=initializeApp({// Your firebase configuration object});constappCheck=initializeAppCheck(app,{provider:appCheckCustomProvider,// Optional argument. If true, the SDK automatically refreshes App Check// tokens as needed.isTokenAutoRefreshEnabled:true});
firebase.initializeApp({// Your firebase configuration object});constappCheck=firebase.appCheck();appCheck.activate(appCheckCustomProvider,// Optional argument. If true, the SDK automatically refreshes App Check// tokens as needed.true);
App Check에 앱을 등록한 후 App Check가 일반적으로 유효한 것으로 분류하지 않는 환경에서 앱을 실행하려는 경우(예: 개발 중 로컬에서 또는 지속적 통합(CI) 환경에서) 실제 증명 제공자 대신 App Check 디버그 제공자를 사용하는 앱의 디버그 빌드를 만들 수 있습니다.
[null,null,["최종 업데이트: 2025-08-24(UTC)"],[],[],null,["This page shows you how to enable App Check in a web app, using [your custom\nApp Check provider](/docs/app-check/web/custom-provider). When you enable App Check, you\nhelp ensure that only your app can access your project's Firebase resources.\n\nIf you want to use App Check with one of the built-in providers, see the\ndocs for\n[App Check with reCAPTCHA Enterprise](/docs/app-check/web/recaptcha-enterprise-provider).\n\nBefore you begin\n\n- [Add Firebase to your JavaScript project](/docs/web/setup) if you haven't\n already done so.\n\n- [Implement your custom App Check provider's server-side logic](/docs/app-check/custom-provider).\n\n1. Add the App Check library to your app\n\n[Add Firebase to your web app](/docs/web/setup) if you haven't already. Be sure\nto import the App Check library.\n\n2. Create the App Check provider object\n\nCreate an App Check provider object for your custom provider. This object\nmust have a `getToken()` method, which collects whatever information your custom\nApp Check provider requires as proof of authenticity, and sends it to your\ntoken acquisition service in exchange for an App Check token. The\nApp Check SDK handles token caching, so always get a new token in your\nimplementation of `getToken()`. \n\nWeb \n\n```javascript\nimport { CustomProvider } from \"firebase/app-check\";\n\nconst appCheckCustomProvider = new CustomProvider({\n getToken: () =\u003e {\n return new Promise((resolve, _reject) =\u003e {\n // TODO: Logic to exchange proof of authenticity for an App Check token and\n // expiration time.\n\n // ...\n\n const appCheckToken = {\n token: tokenFromServer,\n expireTimeMillis: expirationFromServer * 1000\n };\n\n resolve(appCheckToken);\n });\n }\n});https://github.com/firebase/snippets-web/blob/467eaa165dcbd9b3ab15711e76fa52237ba37f8b/snippets/appcheck-next/index/appcheck_custom_provider.js#L8-L29\n```\n\nWeb \n\n```javascript\nconst appCheckCustomProvider = {\n getToken: () =\u003e {\n return new Promise((resolve, _reject) =\u003e {\n // TODO: Logic to exchange proof of authenticity for an App Check token and\n // expiration time.\n\n // ...\n\n const appCheckToken = {\n token: tokenFromServer,\n expireTimeMillis: expirationFromServer * 1000\n };\n\n resolve(appCheckToken);\n });\n }\n};https://github.com/firebase/snippets-web/blob/467eaa165dcbd9b3ab15711e76fa52237ba37f8b/appcheck/index.js#L24-L43\n```\n\n3. Initialize App Check\n\nAdd the following initialization code to your application, before you access any\nFirebase services: \n\nWeb \n\n```javascript\nimport { initializeApp } from \"firebase/app\";\nimport { initializeAppCheck } from \"firebase/app-check\";\n\nconst app = initializeApp({\n // Your firebase configuration object\n});\n\nconst appCheck = initializeAppCheck(app, {\n provider: appCheckCustomProvider,\n\n // Optional argument. If true, the SDK automatically refreshes App Check\n // tokens as needed.\n isTokenAutoRefreshEnabled: true \n});https://github.com/firebase/snippets-web/blob/467eaa165dcbd9b3ab15711e76fa52237ba37f8b/snippets/appcheck-next/index/appcheck_initialize_custom_provider.js#L8-L21\n```\n\nWeb \n\n```javascript\nfirebase.initializeApp({\n // Your firebase configuration object\n});\n\nconst appCheck = firebase.appCheck();\nappCheck.activate(\n appCheckCustomProvider,\n\n // Optional argument. If true, the SDK automatically refreshes App Check\n // tokens as needed.\n true);https://github.com/firebase/snippets-web/blob/467eaa165dcbd9b3ab15711e76fa52237ba37f8b/appcheck/index.js#L53-L63\n```\n| **Note:** The SDK will not automatically refresh App Check tokens by default. That functionality must be explicitly enabled by providing `true` as a second argument to `activate()` or by calling `firebase.appCheck().setTokenAutoRefreshEnabled(true)`. For more, see [the App Check reference docs](/docs/reference/js/firebase.appcheck.AppCheck).\n\nNext steps\n\nOnce the App Check library is installed in your app, deploy it.\n\nThe updated client app will begin sending App Check tokens along with every\nrequest it makes to Firebase, but Firebase products will not require the tokens\nto be valid until you enable enforcement in the App Check section of the\nFirebase console.\n\nMonitor metrics and enable enforcement\n\nBefore you enable enforcement, however, you should make sure that doing so won't\ndisrupt your existing legitimate users. On the other hand, if you're seeing\nsuspicious use of your app resources, you might want to enable enforcement\nsooner.\n\nTo help make this decision, you can look at App Check metrics for the\nservices you use:\n\n- [Monitor App Check request metrics](/docs/app-check/monitor-metrics) for Firebase AI Logic, Data Connect, Realtime Database, Cloud Firestore, Cloud Storage, Authentication, Google Identity for iOS, Maps JavaScript API, and Places API (New).\n- [Monitor App Check request metrics for Cloud Functions](/docs/app-check/monitor-functions-metrics).\n\nEnable App Check enforcement\n\nWhen you understand how App Check will affect your users and you're ready to\nproceed, you can enable App Check enforcement:\n\n- [Enable App Check enforcement](/docs/app-check/enable-enforcement) for Firebase AI Logic, Data Connect, Realtime Database, Cloud Firestore, Cloud Storage, Authentication, Google Identity for iOS, Maps JavaScript API, and Places API (New).\n- [Enable App Check enforcement for Cloud Functions](/docs/app-check/cloud-functions).\n\nUse App Check in debug environments\n\nIf, after you have registered your app for App Check, you want to run your\napp in an environment that App Check would normally not classify as valid,\nsuch as locally during development, or from a continuous integration (CI)\nenvironment, you can create a debug build of your app that uses the\nApp Check debug provider instead of a real attestation provider.\n\nSee [Use App Check with the debug provider in web apps](/docs/app-check/web/debug-provider)."]]