app: add diceware generator dialog

4 files changed, 106 insertions, 0 deletions

diff --git a/app/src/main/java/dev/msfjarvis/aps/injection/prefs/PasswordGeneratorPreferences.kt b/app/src/main/java/dev/msfjarvis/aps/injection/prefs/PasswordGeneratorPreferences.kt
new file mode 100644
index 00000000..14b3a6f2
--- /dev/null
+++ b/app/src/main/java/dev/msfjarvis/aps/injection/prefs/PasswordGeneratorPreferences.kt
@@ -0,0 +1,10 @@
+/*
+ * Copyright © 2014-2021 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package dev.msfjarvis.aps.injection.prefs
+
+import javax.inject.Qualifier
+
+@Qualifier @Retention(AnnotationRetention.RUNTIME) annotation class PasswordGeneratorPreferences
diff --git a/app/src/main/java/dev/msfjarvis/aps/injection/prefs/PreferenceModule.kt b/app/src/main/java/dev/msfjarvis/aps/injection/prefs/PreferenceModule.kt
index 537ee1ad..e68a998f 100644
--- a/app/src/main/java/dev/msfjarvis/aps/injection/prefs/PreferenceModule.kt
+++ b/app/src/main/java/dev/msfjarvis/aps/injection/prefs/PreferenceModule.kt
@@ -32,6 +32,11 @@ class PreferenceModule {
     )
   }
 
+  @[Provides PasswordGeneratorPreferences Reusable]
+  fun providePwgenPreferences(@ApplicationContext context: Context): SharedPreferences {
+    return provideBaseEncryptedPreferences(context, "pwgen_preferences")
+  }
+
   @Provides
   @SettingsPreferences
   @Reusable
diff --git a/app/src/main/java/dev/msfjarvis/aps/ui/dialogs/DicewarePasswordGeneratorDialogFragment.kt b/app/src/main/java/dev/msfjarvis/aps/ui/dialogs/DicewarePasswordGeneratorDialogFragment.kt
new file mode 100644
index 00000000..cac60de3
--- /dev/null
+++ b/app/src/main/java/dev/msfjarvis/aps/ui/dialogs/DicewarePasswordGeneratorDialogFragment.kt
@@ -0,0 +1,88 @@
+/*
+ * Copyright © 2014-2021 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package dev.msfjarvis.aps.ui.dialogs
+
+import android.app.AlertDialog
+import android.app.Dialog
+import android.content.SharedPreferences
+import android.graphics.Typeface
+import android.os.Bundle
+import androidx.core.content.edit
+import androidx.core.os.bundleOf
+import androidx.fragment.app.DialogFragment
+import androidx.fragment.app.setFragmentResult
+import androidx.lifecycle.lifecycleScope
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import dagger.hilt.android.AndroidEntryPoint
+import dev.msfjarvis.aps.R
+import dev.msfjarvis.aps.databinding.FragmentPwgenDicewareBinding
+import dev.msfjarvis.aps.injection.prefs.PasswordGeneratorPreferences
+import dev.msfjarvis.aps.passgen.diceware.DicewarePassphraseGenerator
+import dev.msfjarvis.aps.ui.crypto.PasswordCreationActivity
+import dev.msfjarvis.aps.util.extensions.getString
+import dev.msfjarvis.aps.util.settings.PreferenceKeys.DICEWARE_LENGTH
+import dev.msfjarvis.aps.util.settings.PreferenceKeys.DICEWARE_SEPARATOR
+import javax.inject.Inject
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.merge
+import kotlinx.coroutines.flow.onEach
+import reactivecircus.flowbinding.android.widget.afterTextChanges
+
+@AndroidEntryPoint
+class DicewarePasswordGeneratorDialogFragment : DialogFragment() {
+
+  @Inject lateinit var dicewareGenerator: DicewarePassphraseGenerator
+  @Inject @PasswordGeneratorPreferences lateinit var prefs: SharedPreferences
+
+  override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+    val builder = MaterialAlertDialogBuilder(requireContext())
+    val binding = FragmentPwgenDicewareBinding.inflate(layoutInflater)
+    val monoTypeface = Typeface.createFromAsset(requireContext().assets, "fonts/sourcecodepro.ttf")
+    binding.passwordSeparatorText.setText(prefs.getString(DICEWARE_SEPARATOR) ?: "-")
+    binding.passwordLengthText.setText(prefs.getInt(DICEWARE_LENGTH, 5).toString())
+    binding.passwordText.typeface = monoTypeface
+    builder.setView(binding.root)
+    merge(
+        binding.passwordLengthText.afterTextChanges(),
+        binding.passwordSeparatorText.afterTextChanges(),
+      )
+      .onEach { generatePassword(binding) }
+      .launchIn(lifecycleScope)
+    return builder
+      .run {
+        setTitle(R.string.pwgen_title)
+        setPositiveButton(R.string.dialog_ok) { _, _ ->
+          setFragmentResult(
+            PasswordCreationActivity.PASSWORD_RESULT_REQUEST_KEY,
+            bundleOf(PasswordCreationActivity.RESULT to "${binding.passwordText.text}")
+          )
+        }
+        setNeutralButton(R.string.dialog_cancel) { _, _ -> }
+        setNegativeButton(R.string.pwgen_generate, null)
+        create()
+      }
+      .apply {
+        setOnShowListener {
+          generatePassword(binding)
+          getButton(AlertDialog.BUTTON_NEGATIVE).setOnClickListener { generatePassword(binding) }
+        }
+      }
+  }
+
+  private fun generatePassword(binding: FragmentPwgenDicewareBinding) {
+    val length = binding.passwordLengthText.text?.toString()?.toIntOrNull() ?: 5
+    val separator = binding.passwordSeparatorText.text?.toString()?.getOrNull(0) ?: '-'
+    setPreferences(length, separator)
+    binding.passwordText.text = dicewareGenerator.generatePassphrase(length, separator)
+  }
+
+  private fun setPreferences(length: Int, separator: Char) {
+    prefs.edit {
+      putInt(DICEWARE_LENGTH, length)
+      putString(DICEWARE_SEPARATOR, separator.toString())
+    }
+  }
+}
diff --git a/app/src/main/java/dev/msfjarvis/aps/util/settings/PreferenceKeys.kt b/app/src/main/java/dev/msfjarvis/aps/util/settings/PreferenceKeys.kt
index 7e3166d8..6168cfee 100644
--- a/app/src/main/java/dev/msfjarvis/aps/util/settings/PreferenceKeys.kt
+++ b/app/src/main/java/dev/msfjarvis/aps/util/settings/PreferenceKeys.kt
@@ -82,4 +82,7 @@ object PreferenceKeys {
   const val PROXY_PASSWORD = "proxy_password"
 
   const val REBASE_ON_PULL = "rebase_on_pull"
+
+  const val DICEWARE_SEPARATOR = "diceware_separator"
+  const val DICEWARE_LENGTH = "diceware_length"
 }