Add VaultSdkSource.getUserEncryptionKey (#545)

app/src/main/java/com/x8bit/bitwarden/data/vault/datasource/sdk/VaultSdkSource.kt

@@ -8,6 +8,7 @@ import com.bitwarden.core.CollectionView
 import com.bitwarden.core.Folder
 import com.bitwarden.core.FolderView
 import com.bitwarden.core.InitOrgCryptoRequest
+import com.bitwarden.core.InitUserCryptoMethod
 import com.bitwarden.core.InitUserCryptoRequest
 import com.bitwarden.core.PasswordHistory
 import com.bitwarden.core.PasswordHistoryView
@@ -27,6 +28,15 @@ interface VaultSdkSource {
      */
     fun clearCrypto(userId: String)
 
+    /**
+     * Gets the user's encryption key, which can be used to later unlock their vault via a call to
+     * [initializeCrypto] with [InitUserCryptoMethod.DecryptedKey].
+     *
+     * This should only be called after a successful call to [initializeCrypto] for the associated
+     * user.
+     */
+    suspend fun getUserEncryptionKey(userId: String): Result<String>
+
     /**
      * Attempts to initialize cryptography functionality for an individual user with the given
      * [userId] for the Bitwarden SDK with a given [InitUserCryptoRequest].

app/src/main/java/com/x8bit/bitwarden/data/vault/datasource/sdk/VaultSdkSourceImpl.kt

@@ -31,6 +31,15 @@ class VaultSdkSourceImpl(
         sdkClientManager.destroyClient(userId = userId)
     }
 
+    override suspend fun getUserEncryptionKey(
+        userId: String,
+    ): Result<String> =
+        runCatching {
+            getClient(userId = userId)
+                .crypto()
+                .getUserEncryptionKey()
+        }
+
     override suspend fun initializeCrypto(
         userId: String,
         request: InitUserCryptoRequest,