Auth: Add support for emulator

.firebaserc

@@ -0,0 +1 @@
+{}

.github/workflows/build-pr.yml

@@ -11,7 +11,11 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 17
-      - name: Build
-        uses: eskatos/gradle-command-action@v3
+      - name: Set up Node.js 20
+        uses: actions/setup-node@v4
         with:
-          arguments: build
+          node-version: 20
+      - name: Install Firebase CLI
+        run: npm install -g firebase-tools
+      - name: Build
+        run: firebase emulators:exec --project my-firebase-project --import=src/test/resources/firebase_data './gradlew build'

firebase.json

@@ -0,0 +1,11 @@
+{
+  "emulators": {
+    "auth": {
+      "port": 9099
+    },
+    "ui": {
+      "enabled": true
+    },
+    "singleProjectMode": true
+  }
+}

src/main/java/com/google/firebase/auth/FirebaseAuth.kt

@@ -43,6 +43,15 @@ import java.util.concurrent.TimeUnit
 
 val jsonParser = Json { ignoreUnknownKeys = true }
 
+class UrlFactory(
+    private val app: FirebaseApp,
+    private val emulatorUrl: String? = null
+) {
+    fun buildUrl(uri: String): String {
+        return "${emulatorUrl ?: "https://"}$uri?key=${app.options.apiKey}"
+    }
+}
+
 @Serializable
 class FirebaseUserImpl private constructor(
     @Transient
@@ -52,17 +61,20 @@ class FirebaseUserImpl private constructor(
     val idToken: String,
     val refreshToken: String,
     val expiresIn: Int,
-    val createdAt: Long
+    val createdAt: Long,
+    @Transient
+    private val urlFactory: UrlFactory = UrlFactory(app)
 ) : FirebaseUser() {
 
-    constructor(app: FirebaseApp, data: JsonObject, isAnonymous: Boolean = data["isAnonymous"]?.jsonPrimitive?.booleanOrNull ?: false) : this(
+    constructor(app: FirebaseApp, data: JsonObject, isAnonymous: Boolean = data["isAnonymous"]?.jsonPrimitive?.booleanOrNull ?: false, urlFactory: UrlFactory = UrlFactory(app)) : this(
         app,
         isAnonymous,
         data["uid"]?.jsonPrimitive?.contentOrNull ?: data["user_id"]?.jsonPrimitive?.contentOrNull ?: data["localId"]?.jsonPrimitive?.contentOrNull ?: "",
         data["idToken"]?.jsonPrimitive?.contentOrNull ?: data.getValue("id_token").jsonPrimitive.content,
         data["refreshToken"]?.jsonPrimitive?.contentOrNull ?: data.getValue("refresh_token").jsonPrimitive.content,
         data["expiresIn"]?.jsonPrimitive?.intOrNull ?: data.getValue("expires_in").jsonPrimitive.int,
-        data["createdAt"]?.jsonPrimitive?.longOrNull ?: System.currentTimeMillis()
+        data["createdAt"]?.jsonPrimitive?.longOrNull ?: System.currentTimeMillis(),
+        urlFactory
     )
 
     val claims: Map<String, Any?> by lazy {
@@ -85,7 +97,7 @@ class FirebaseUserImpl private constructor(
         val source = TaskCompletionSource<Void>()
         val body = RequestBody.create(FirebaseAuth.getInstance(app).json, JsonObject(mapOf("idToken" to JsonPrimitive(idToken))).toString())
         val request = Request.Builder()
-            .url("https://www.googleapis.com/identitytoolkit/v3/relyingparty/deleteAccount?key=" + app.options.apiKey)
+            .url(urlFactory.buildUrl("www.googleapis.com/identitytoolkit/v3/relyingparty/deleteAccount"))
             .post(body)
             .build()
         FirebaseAuth.getInstance(app).client.newCall(request).enqueue(object : Callback {
@@ -184,11 +196,13 @@ class FirebaseAuth constructor(val app: FirebaseApp) : InternalAuthProvider {
             }
         }
 
+    private var urlFactory = UrlFactory(app)
+
     fun signInAnonymously(): Task<AuthResult> {
         val source = TaskCompletionSource<AuthResult>()
         val body = RequestBody.create(json, JsonObject(mapOf("returnSecureToken" to JsonPrimitive(true))).toString())
         val request = Request.Builder()
-            .url("https://identitytoolkit.googleapis.com/v1/accounts:signUp?key=" + app.options.apiKey)
+            .url(urlFactory.buildUrl("identitytoolkit.googleapis.com/v1/accounts:signUp"))
             .post(body)
             .build()
         client.newCall(request).enqueue(object : Callback {
@@ -220,7 +234,7 @@ class FirebaseAuth constructor(val app: FirebaseApp) : InternalAuthProvider {
             JsonObject(mapOf("token" to JsonPrimitive(customToken), "returnSecureToken" to JsonPrimitive(true))).toString()
         )
         val request = Request.Builder()
-            .url("https://www.googleapis.com/identitytoolkit/v3/relyingparty/verifyCustomToken?key=" + app.options.apiKey)
+            .url(urlFactory.buildUrl("www.googleapis.com/identitytoolkit/v3/relyingparty/verifyCustomToken"))
             .post(body)
             .build()
         client.newCall(request).enqueue(object : Callback {
@@ -252,7 +266,7 @@ class FirebaseAuth constructor(val app: FirebaseApp) : InternalAuthProvider {
             JsonObject(mapOf("email" to JsonPrimitive(email), "password" to JsonPrimitive(password), "returnSecureToken" to JsonPrimitive(true))).toString()
         )
         val request = Request.Builder()
-            .url("https://www.googleapis.com/identitytoolkit/v3/relyingparty/verifyPassword?key=" + app.options.apiKey)
+            .url(urlFactory.buildUrl("www.googleapis.com/identitytoolkit/v3/relyingparty/verifyPassword"))
             .post(body)
             .build()
         client.newCall(request).enqueue(object : Callback {
@@ -336,7 +350,7 @@ class FirebaseAuth constructor(val app: FirebaseApp) : InternalAuthProvider {
             ).toString()
         )
         val request = Request.Builder()
-            .url("https://securetoken.googleapis.com/v1/token?key=" + app.options.apiKey)
+            .url(urlFactory.buildUrl("securetoken.googleapis.com/v1/token"))
             .post(body)
             .build()
 
@@ -439,5 +453,8 @@ class FirebaseAuth constructor(val app: FirebaseApp) : InternalAuthProvider {
     fun signInWithEmailLink(email: String, link: String): Task<AuthResult> = TODO()
 
     fun setLanguageCode(value: String): Nothing = TODO()
-    fun useEmulator(host: String, port: Int): Unit = TODO()
+
+    fun useEmulator(host: String, port: Int) {
+        urlFactory = UrlFactory(app, "http://$host:$port/")
+    }
 }

src/test/kotlin/AuthTest.kt

@@ -0,0 +1,47 @@
+import com.google.firebase.auth.FirebaseAuth
+import com.google.firebase.auth.FirebaseAuthInvalidUserException
+import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.tasks.await
+import kotlinx.coroutines.test.runTest
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertThrows
+import org.junit.Test
+
+class AuthTest : FirebaseTest() {
+    private fun createAuth(): FirebaseAuth {
+        return FirebaseAuth(app).apply {
+            useEmulator("localhost", 9099)
+        }
+    }
+
+    @Test
+    fun `should authenticate via anonymous auth`() = runTest {
+        val auth = createAuth()
+
+        auth.signInAnonymously().await()
+
+        assertEquals(true, auth.currentUser?.isAnonymous)
+    }
+
+    @Test
+    fun `should authenticate via email and password`() = runTest {
+        val auth = createAuth()
+
+        auth.signInWithEmailAndPassword("email@example.com", "securepassword").await()
+
+        assertEquals(false, auth.currentUser?.isAnonymous)
+    }
+
+    @Test
+    fun `should throw exception on invalid password`() {
+        val auth = createAuth()
+
+        val exception = assertThrows(FirebaseAuthInvalidUserException::class.java) {
+            runBlocking {
+                auth.signInWithEmailAndPassword("email@example.com", "wrongpassword").await()
+            }
+        }
+
+        assertEquals("INVALID_PASSWORD", exception.errorCode)
+    }
+}

src/test/kotlin/FirebaseTest.kt

@@ -1,9 +1,33 @@
+import android.app.Application
+import com.google.firebase.Firebase
 import com.google.firebase.FirebaseApp
+import com.google.firebase.FirebaseOptions
+import com.google.firebase.FirebasePlatform
+import com.google.firebase.initialize
 import org.junit.Before
+import java.io.File
 
 abstract class FirebaseTest {
+    protected val app: FirebaseApp get() {
+        val options = FirebaseOptions.Builder()
+            .setProjectId("my-firebase-project")
+            .setApplicationId("1:27992087142:android:ce3b6448250083d1")
+            .setApiKey("AIzaSyADUe90ULnQDuGShD9W23RDP0xmeDc6Mvw")
+            .build()
+
+        return Firebase.initialize(Application(), options)
+    }
+
     @Before
     fun beforeEach() {
+        FirebasePlatform.initializeFirebasePlatform(object : FirebasePlatform() {
+            val storage = mutableMapOf<String, String>()
+            override fun store(key: String, value: String) = storage.set(key, value)
+            override fun retrieve(key: String) = storage[key]
+            override fun clear(key: String) { storage.remove(key) }
+            override fun log(msg: String) = println(msg)
+            override fun getDatabasePath(name: String) = File("./build/$name")
+        })
         FirebaseApp.clearInstancesForTest()
     }
 }

src/test/kotlin/FirestoreTest.kt

@@ -1,42 +1,19 @@
-import android.app.Application
 import com.google.firebase.Firebase
-import com.google.firebase.FirebaseOptions
-import com.google.firebase.FirebasePlatform
 import com.google.firebase.firestore.firestore
-import com.google.firebase.initialize
 import kotlinx.coroutines.tasks.await
 import kotlinx.coroutines.test.runTest
 import org.junit.Assert.assertEquals
-import org.junit.Before
 import org.junit.Test
-import java.io.File
 
 class FirestoreTest : FirebaseTest() {
-    @Before
-    fun initialize() {
-        FirebasePlatform.initializeFirebasePlatform(object : FirebasePlatform() {
-            val storage = mutableMapOf<String, String>()
-            override fun store(key: String, value: String) = storage.set(key, value)
-            override fun retrieve(key: String) = storage[key]
-            override fun clear(key: String) { storage.remove(key) }
-            override fun log(msg: String) = println(msg)
-            override fun getDatabasePath(name: String) = File("./build/$name")
-        })
-        val options = FirebaseOptions.Builder()
-            .setProjectId("my-firebase-project")
-            .setApplicationId("1:27992087142:android:ce3b6448250083d1")
-            .setApiKey("AIzaSyADUe90ULnQDuGShD9W23RDP0xmeDc6Mvw")
-            // setDatabaseURL(...)
-            // setStorageBucket(...)
-            .build()
-        Firebase.initialize(Application(), options)
-        Firebase.firestore.disableNetwork()
-    }
 
     @Test
     fun testFirestore(): Unit = runTest {
+        val firestore = Firebase.firestore(app)
+        firestore.disableNetwork().await()
+
         val data = Data("jim")
-        val doc = Firebase.firestore.document("sally/jim")
+        val doc = firestore.document("sally/jim")
         doc.set(data)
         assertEquals(data, doc.get().await().toObject(Data::class.java))
     }

src/test/resources/firebase_data/auth_export/accounts.json

@@ -0,0 +1,29 @@
+{
+  "kind": "identitytoolkit#DownloadAccountResponse",
+  "users": [
+    {
+      "localId": "Ijat10t0F1gvH1VrClkkSqEcId1p",
+      "lastLoginAt": "1728509249920",
+      "displayName": "",
+      "photoUrl": "",
+      "emailVerified": true,
+      "email": "email@example.com",
+      "salt": "fakeSaltHsRxYqy9iKVQRLwz8975",
+      "passwordHash": "fakeHash:salt=fakeSaltHsRxYqy9iKVQRLwz8975:password=securepassword",
+      "passwordUpdatedAt": 1728509249921,
+      "validSince": "1728509249",
+      "mfaInfo": [],
+      "createdAt": "1728509249920",
+      "providerUserInfo": [
+        {
+          "providerId": "password",
+          "email": "email@example.com",
+          "federatedId": "email@example.com",
+          "rawId": "email@example.com",
+          "displayName": "",
+          "photoUrl": ""
+        }
+      ]
+    }
+  ]
+}

src/test/resources/firebase_data/auth_export/config.json

@@ -0,0 +1,8 @@
+{
+  "signIn": {
+    "allowDuplicateEmails": false
+  },
+  "emailPrivacyConfig": {
+    "enableImprovedEmailPrivacy": false
+  }
+}

src/test/resources/firebase_data/firebase-export-metadata.json

@@ -0,0 +1,7 @@
+{
+  "version": "13.3.1",
+  "auth": {
+    "version": "13.3.1",
+    "path": "auth_export"
+  }
+}