fix: crash on incorrect password

app/src/main/java/ani/dantotsu/settings/SettingsActivity.kt

@@ -97,21 +97,28 @@ class SettingsActivity : AppCompatActivity(), SimpleDialog.OnDialogResultListene
                             if (password != null) {
                                 val salt = jsonString.copyOfRange(0, 16)
                                 val encrypted = jsonString.copyOfRange(16, jsonString.size)
-                                val decryptedJson = PreferenceKeystore.decryptWithPassword(
+                                val decryptedJson = try {
+                                    PreferenceKeystore.decryptWithPassword(
                                         password,
                                         encrypted,
                                         salt
-                                )
+                                    )
+                                } catch (e: Exception) {
+                                    toast("Incorrect password")
+                                    return@passwordAlertDialog
+                                }
                                 if(PreferencePackager.unpack(decryptedJson))
                                     restartApp()
                             } else {
                                 toast("Password cannot be empty")
                             }
                         }
-                    } else {
+                    } else if (name.endsWith(".ani")) {
                         val decryptedJson = jsonString.toString(Charsets.UTF_8)
                         if(PreferencePackager.unpack(decryptedJson))
                             restartApp()
+                    } else {
+                        toast("Unknown file type")
                     }
                 } catch (e: Exception) {
                     e.printStackTrace()

app/src/main/java/ani/dantotsu/settings/saving/internal/PreferencePackager.kt

@@ -1,7 +1,11 @@
 package ani.dantotsu.settings.saving.internal
 
 import android.content.SharedPreferences
+import android.net.Uri
+import androidx.documentfile.provider.DocumentFile
+import ani.dantotsu.connections.discord.serializers.Activity
 import ani.dantotsu.settings.saving.PrefManager
+import ani.dantotsu.toast
 import com.google.gson.Gson
 import com.google.gson.reflect.TypeToken
 
@@ -10,11 +14,18 @@ class PreferencePackager {
 
     companion object {
 
+        /**
+         * @return a json string of the packed preferences
+         */
         fun pack(map: Map<Location, SharedPreferences>): String {
             val prefsMap = packagePreferences(map)
             val gson = Gson()
             return gson.toJson(prefsMap)
         }
+
+        /**
+         * @return true if successful, false if error
+         */
         fun unpack(decryptedJson: String): Boolean {
             val gson = Gson()
             val type = object : TypeToken<Map<String, Map<String, Map<String, Any>>>>() {}.type  //oh god...
@@ -47,6 +58,9 @@ class PreferencePackager {
             return unpackagePreferences(deserializedMap)
         }
 
+        /**
+         * @return a map of location names to a map of preference names to their values
+         */
         private fun packagePreferences(map: Map<Location, SharedPreferences>): Map<String, Map<String, *>> {
             val result = mutableMapOf<String, Map<String, *>>()
             for ((location, preferences) in map) {
@@ -63,7 +77,6 @@ class PreferencePackager {
             return result
         }
 
-
         /**
          * @return true if successful, false if error
          */