Admin Database API 簡介

有了 Admin SDK，您可以運用完整管理員權限 讀取及寫入即時資料庫資料 也能使用精細的有限權限 在本文件中，我們會逐步引導您加入 Firebase Admin SDK ，即可存取 Firebase 即時資料庫。

即時資料庫執行個體可在不同的地理區域建立， firebaseio.com 和 firebasedatabase.app 網址配置。Admin SDK 設定網址的方法可使用兩種通訊協定。適用於目前支援的區域和網址 請參閱指南主題，瞭解如何選取 Firebase 專案中的位置

Admin SDK 設定

如要在伺服器上開始使用 Firebase 即時資料庫，請按照下列步驟操作： 就必須先設定 Firebase Admin SDK。

如果您有興趣使用 Node.js SDK 做為使用者的用戶端 例如在 Node.js 桌面或 IoT 應用程式中 從特殊權限環境 (例如伺服器) 取得管理員存取權，因此您應 請改為遵循 設定用戶端的操作說明 JavaScript SDK。

Admin SDK 驗證

如要透過 Firebase Admin SDK 從伺服器存取 Firebase 即時資料庫，您必須 透過 Firebase 驗證你的伺服器驗證伺服器時，不要使用 和在用戶端應用程式中一樣，您必須透過 服務帳戶 Firebase 可以透過這組識別碼 識別你的伺服器

使用 Firebase Admin SDK：

Firebase Admin SDK 驗證存取層級
管理員權限	具備專案即時資料庫的完整讀取和寫入權限。與以下項目搭配使用： 執行管理工作 (例如資料遷移或重組) 取得專案資源的無限制存取權
有限權限	只能存取專案的即時資料庫 伺服器需求在這個層級完成定義明確的管理工作 存取需求舉例來說，執行摘要工作時，系統會讀取 可以設定唯讀 接著，在權限受限的情況下初始化 Admin SDK 套用該規則

使用管理員權限進行驗證

使用服務的憑證初始化 Firebase Admin SDK 時 具備 Firebase 專案「編輯者」角色的帳戶，該執行個體 具備專案即時資料庫的完整讀取和寫入權限。

Java

// Fetch the service account key JSON file contents
FileInputStream serviceAccount = new FileInputStream("path/to/serviceAccount.json");

// Initialize the app with a service account, granting admin privileges
FirebaseOptions options = FirebaseOptions.builder()
    .setCredentials(GoogleCredentials.fromStream(serviceAccount))
    // The database URL depends on the location of the database
    .setDatabaseUrl("https://DATABASE_NAME.firebaseio.com")
    .build();
FirebaseApp.initializeApp(options);

// As an admin, the app has access to read and write all data, regardless of Security Rules
DatabaseReference ref = FirebaseDatabase.getInstance()
    .getReference("restricted_access/secret_document");
ref.addListenerForSingleValueEvent(new ValueEventListener() {
  @Override
  public void onDataChange(DataSnapshot dataSnapshot) {
    Object document = dataSnapshot.getValue();
    System.out.println(document);
  }

  @Override
  public void onCancelled(DatabaseError error) {
  }
});

Node.js

var admin = require("firebase-admin");

// Fetch the service account key JSON file contents
var serviceAccount = require("path/to/serviceAccountKey.json");

// Initialize the app with a service account, granting admin privileges
admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  // The database URL depends on the location of the database
  databaseURL: "https://DATABASE_NAME.firebaseio.com"
});

// As an admin, the app has access to read and write all data, regardless of Security Rules
var db = admin.database();
var ref = db.ref("restricted_access/secret_document");
ref.once("value", function(snapshot) {
  console.log(snapshot.val());
});

Python

import firebase_admin
from firebase_admin import credentials
from firebase_admin import db

# Fetch the service account key JSON file contents
cred = credentials.Certificate('path/to/serviceAccountKey.json')

# Initialize the app with a service account, granting admin privileges
firebase_admin.initialize_app(cred, {
    'databaseURL': 'https://databaseName.firebaseio.com'
})

# As an admin, the app has access to read and write all data, regradless of Security Rules
ref = db.reference('restricted_access/secret_document')
print(ref.get())

Go

ctx := context.Background()
conf := &firebase.Config{
	DatabaseURL: "https://databaseName.firebaseio.com",
}
// Fetch the service account key JSON file contents
opt := option.WithCredentialsFile("path/to/serviceAccountKey.json")

// Initialize the app with a service account, granting admin privileges
app, err := firebase.NewApp(ctx, conf, opt)
if err != nil {
	log.Fatalln("Error initializing app:", err)
}

client, err := app.Database(ctx)
if err != nil {
	log.Fatalln("Error initializing database client:", err)
}

// As an admin, the app has access to read and write all data, regradless of Security Rules
ref := client.NewRef("restricted_access/secret_document")
var data map[string]interface{}
if err := ref.Get(ctx, &data); err != nil {
	log.Fatalln("Error reading from database:", err)
}
fmt.Println(data)

您的服務所具備的存取權取決於用於登入的服務帳戶 進行驗證例如，您可以使用 擁有專案中具備「讀取者」角色的服務帳戶。同樣地 沒有專案中的角色，因此無法讀取或寫入任何資料。

以有限的權限進行驗證

根據最佳做法，服務只能存取所需的資源。若要取得 更精細地控管 Firebase 應用程式執行個體可使用的資源 存取時，請使用安全性規則中的專屬 ID 代表您的服務接著設定適當的規則來授予服務存取權 所需的資源例如：

{
  "rules": {
    "public_resource": {
      ".read": true,
      ".write": true
    },
    "some_resource": {
      ".read": "auth.uid === 'my-service-worker'",
      ".write": false
    },
    "another_resource": {
      ".read": "auth.uid === 'my-service-worker'",
      ".write": "auth.uid === 'my-service-worker'"
    }
  }
}

接著，在伺服器上初始化 Firebase 應用程式時，使用 databaseAuthVariableOverride 選項可覆寫自己使用的 auth 物件 您的資料庫規則在這個自訂 auth 物件中，將 uid 欄位設為 。

Java

// Fetch the service account key JSON file contents
FileInputStream serviceAccount = new FileInputStream("path/to/serviceAccountCredentials.json");

// Initialize the app with a custom auth variable, limiting the server's access
Map<String, Object> auth = new HashMap<String, Object>();
auth.put("uid", "my-service-worker");

FirebaseOptions options = new FirebaseOptions.Builder()
    .setCredential(FirebaseCredentials.fromCertificate(serviceAccount))
    // The database URL depends on the location of the database
    .setDatabaseUrl("https://DATABASE_NAME.firebaseio.com")
    .setDatabaseAuthVariableOverride(auth)
    .build();
FirebaseApp.initializeApp(options);

// The app only has access as defined in the Security Rules
DatabaseReference ref = FirebaseDatabase
    .getInstance()
    .getReference("/some_resource");
ref.addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        String res = dataSnapshot.getValue();
        System.out.println(res);
    }
});

Node.js

var admin = require("firebase-admin");

// Fetch the service account key JSON file contents
var serviceAccount = require("path/to/serviceAccountKey.json");

// Initialize the app with a custom auth variable, limiting the server's access
admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  // The database URL depends on the location of the database
  databaseURL: "https://DATABASE_NAME.firebaseio.com",
  databaseAuthVariableOverride: {
    uid: "my-service-worker"
  }
});

// The app only has access as defined in the Security Rules
var db = admin.database();
var ref = db.ref("/some_resource");
ref.once("value", function(snapshot) {
  console.log(snapshot.val());
});

Python

import firebase_admin
from firebase_admin import credentials
from firebase_admin import db

# Fetch the service account key JSON file contents
cred = credentials.Certificate('path/to/serviceAccountKey.json')

# Initialize the app with a custom auth variable, limiting the server's access
firebase_admin.initialize_app(cred, {
    'databaseURL': 'https://databaseName.firebaseio.com',
    'databaseAuthVariableOverride': {
        'uid': 'my-service-worker'
    }
})

# The app only has access as defined in the Security Rules
ref = db.reference('/some_resource')
print(ref.get())

Go

ctx := context.Background()
// Initialize the app with a custom auth variable, limiting the server's access
ao := map[string]interface{}{"uid": "my-service-worker"}
conf := &firebase.Config{
	DatabaseURL:  "https://databaseName.firebaseio.com",
	AuthOverride: &ao,
}

// Fetch the service account key JSON file contents
opt := option.WithCredentialsFile("path/to/serviceAccountKey.json")

app, err := firebase.NewApp(ctx, conf, opt)
if err != nil {
	log.Fatalln("Error initializing app:", err)
}

client, err := app.Database(ctx)
if err != nil {
	log.Fatalln("Error initializing database client:", err)
}

// The app only has access as defined in the Security Rules
ref := client.NewRef("/some_resource")
var data map[string]interface{}
if err := ref.Get(ctx, &data); err != nil {
	log.Fatalln("Error reading from database:", err)
}
fmt.Println(data)

在某些情況下，您可能會想將 Admin SDK 視為 未經驗證的用戶端做法是提供 null，用於資料庫驗證變數覆寫。

Java

// Fetch the service account key JSON file contents
FileInputStream serviceAccount = new FileInputStream("path/to/serviceAccountCredentials.json");

FirebaseOptions options = new FirebaseOptions.Builder()
    .setCredential(FirebaseCredentials.fromCertificate(serviceAccount))
    // The database URL depends on the location of the database
    .setDatabaseUrl("https://DATABASE_NAME.firebaseio.com")
    .setDatabaseAuthVariableOverride(null)
    .build();
FirebaseApp.initializeApp(options);

// The app only has access to public data as defined in the Security Rules
DatabaseReference ref = FirebaseDatabase
    .getInstance()
    .getReference("/public_resource");
ref.addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        String res = dataSnapshot.getValue();
        System.out.println(res);
    }
});

Node.js

var admin = require("firebase-admin");

// Fetch the service account key JSON file contents
var serviceAccount = require("path/to/serviceAccountKey.json");

// Initialize the app with a null auth variable, limiting the server's access
admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  // The database URL depends on the location of the database
  databaseURL: "https://DATABASE_NAME.firebaseio.com",
  databaseAuthVariableOverride: null
});

// The app only has access to public data as defined in the Security Rules
var db = admin.database();
var ref = db.ref("/public_resource");
ref.once("value", function(snapshot) {
  console.log(snapshot.val());
});

Python

import firebase_admin
from firebase_admin import credentials
from firebase_admin import db

# Fetch the service account key JSON file contents
cred = credentials.Certificate('path/to/serviceAccountKey.json')

# Initialize the app with a None auth variable, limiting the server's access
firebase_admin.initialize_app(cred, {
    'databaseURL': 'https://databaseName.firebaseio.com',
    'databaseAuthVariableOverride': None
})

# The app only has access to public data as defined in the Security Rules
ref = db.reference('/public_resource')
print(ref.get())

Go

ctx := context.Background()
// Initialize the app with a nil auth variable, limiting the server's access
var nilMap map[string]interface{}
conf := &firebase.Config{
	DatabaseURL:  "https://databaseName.firebaseio.com",
	AuthOverride: &nilMap,
}

// Fetch the service account key JSON file contents
opt := option.WithCredentialsFile("path/to/serviceAccountKey.json")

app, err := firebase.NewApp(ctx, conf, opt)
if err != nil {
	log.Fatalln("Error initializing app:", err)
}

client, err := app.Database(ctx)
if err != nil {
	log.Fatalln("Error initializing database client:", err)
}

// The app only has access to public data as defined in the Security Rules
ref := client.NewRef("/some_resource")
var data map[string]interface{}
if err := ref.Get(ctx, &data); err != nil {
	log.Fatalln("Error reading from database:", err)
}
fmt.Println(data)

後續步驟

• 瞭解如何針對即時資料庫建立資料結構。
• 在多個資料庫執行個體中調度資料資源。
• 儲存資料。
• 擷取資料。
• 在以下位置查看資料庫： Firebase 控制台。