[PM-19866] Migrate BaseEncryptedDiskSource to data module (#4991)

data/src/main/kotlin/com/bitwarden/data/datasource/disk/BaseEncryptedDiskSource.kt

@@ -0,0 +1,32 @@
+package com.bitwarden.data.datasource.disk
+
+import android.content.SharedPreferences
+import androidx.core.content.edit
+import androidx.security.crypto.EncryptedSharedPreferences
+
+/**
+ * Base class for simplifying interactions with [SharedPreferences] and
+ * [EncryptedSharedPreferences].
+ */
+@Suppress("UnnecessaryAbstractClass")
+abstract class BaseEncryptedDiskSource(
+    sharedPreferences: SharedPreferences,
+    private val encryptedSharedPreferences: SharedPreferences,
+) : BaseDiskSource(
+    sharedPreferences = sharedPreferences,
+) {
+    protected fun getEncryptedString(
+        key: String,
+        default: String? = null,
+    ): String? = encryptedSharedPreferences.getString(key.withBase(), default)
+
+    protected fun putEncryptedString(
+        key: String,
+        value: String?,
+    ): Unit = encryptedSharedPreferences.edit { putString(key.withBase(), value) }
+}
+
+/**
+ * Helper method for prepending the key with the appropriate base storage key.
+ */
+private fun String.withBase(): String = "bwSecureStorage:$this"