diff --git a/app/build.gradle b/app/build.gradle
index d1d10d4b..7767d07a 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -50,6 +50,7 @@ dependencies {
     androidTestImplementation "androidx.test.ext:junit:$rootProject.extJunitVersion"
     androidTestImplementation "androidx.test.espresso:espresso-core:$rootProject.espressoCoreVersion"
     implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$rootProject.lifeCycleVersion"
+    implementation "com.google.android.gms:play-services-auth:$rootProject.playServicesVersion"
 }
 
 def getDeeplApiKey() {
diff --git a/app/src/main/java/ru/easycode/words504/languages/data/cloud/SignInDataSource.kt b/app/src/main/java/ru/easycode/words504/languages/data/cloud/SignInDataSource.kt
new file mode 100644
index 00000000..bcd9643f
--- /dev/null
+++ b/app/src/main/java/ru/easycode/words504/languages/data/cloud/SignInDataSource.kt
@@ -0,0 +1,24 @@
+package ru.easycode.words504.languages.data.cloud
+
+import android.content.Context
+import com.google.android.gms.auth.api.signin.GoogleSignIn
+import com.google.android.gms.auth.api.signin.GoogleSignInAccount
+import ru.easycode.words504.domain.HandleError
+
+interface SignInDataSource {
+
+    suspend fun checkSignIn(): GoogleSignInAccount
+
+    class Base(
+        private val context: Context,
+        private val errorHandler: HandleError<Exception, Throwable>
+    ) : SignInDataSource {
+        override suspend fun checkSignIn(): GoogleSignInAccount {
+            try {
+                return GoogleSignIn.getLastSignedInAccount(context)!!
+            } catch (e: Exception) {
+                throw errorHandler.handle(e)
+            }
+        }
+    }
+}
diff --git a/build.gradle b/build.gradle
index b3724826..a1c561f1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -23,4 +23,5 @@ ext {
     constraintlayoutVersion = '2.1.4'
     extJunitVersion = '1.1.5'
     espressoCoreVersion = '3.5.1'
+    playServicesVersion = '20.4.1'
 }