feat: Indexed keychain values

Author: ovitrif

app/src/main/java/to/bitkit/data/keychain/KeychainStore.kt

@@ -1,3 +1,5 @@
+@file:Suppress("unused")
+
 package to.bitkit.data.keychain
 
 import android.content.Context
@@ -10,29 +12,38 @@ import androidx.datastore.preferences.preferencesDataStore
 import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.map
+import to.bitkit.data.AppDb
 import javax.inject.Inject
 
 class KeychainStore @Inject constructor(
     @ApplicationContext private val context: Context,
+    db: AppDb,
 ) {
     private val Context.prefs: DataStore<Preferences> by preferencesDataStore("keychain")
     private val prefs: DataStore<Preferences> by lazy { context.prefs }
 
+    private val walletIndex by lazy { db.configDao().getAll().map { it.first().walletIndex }.toString() }
+
     suspend fun get(key: String): ByteArray? {
-        val prefKey = stringPreferencesKey(key)
+        val prefKey = indexed(key)
         return prefs.data.map { it[prefKey].fromBase64() }.first()
     }
 
     suspend fun add(key: String, encryptedValue: ByteArray) {
-        val prefKey = stringPreferencesKey(key)
+        val prefKey = indexed(key)
         prefs.edit { it[prefKey] = encryptedValue.toBase64() }
     }
 
     suspend fun remove(key: String) {
-        val prefKey = stringPreferencesKey(key)
+        val prefKey = indexed(key)
         prefs.edit { it.remove(prefKey) }
     }
 
+    /**
+     * Generates a preferences key for storing a string value associated with a specific wallet index.
+     */
+    private fun indexed(key: String) = "$walletIndex:$key".let(::stringPreferencesKey)
+
     private fun ByteArray.toBase64(flags: Int = Base64.DEFAULT) = Base64.encodeToString(this, flags)
     private fun String?.fromBase64(flags: Int = Base64.DEFAULT) = Base64.decode(this, flags)
 }