Make PGPainless backend feature flag runtime configurable (#1654)

* Make feature flags runtime configurable

* Add a settings entry for PGPainless feature flag

* Add changelog entry

11 files changed, 116 insertions, 17 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2d61673c..9ade72cb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ All notable changes to this project will be documented in this file.
 -   Allow pinning shortcuts directly to the launcher home screen
 -   Another workaround for SteamGuard's non-standard OTP format
 -   Allow importing QR code from images
+-   Introduce a new opt-in PGP backend powered by [PGPainless](https://github.com/pgpainless/pgpainless) that does not require OpenKeychain
 
 ### Fixed
 
diff --git a/app/src/main/java/dev/msfjarvis/aps/ui/autofill/AutofillFilterView.kt b/app/src/main/java/dev/msfjarvis/aps/ui/autofill/AutofillFilterView.kt
index bb6d1056..55f3fc11 100644
--- a/app/src/main/java/dev/msfjarvis/aps/ui/autofill/AutofillFilterView.kt
+++ b/app/src/main/java/dev/msfjarvis/aps/ui/autofill/AutofillFilterView.kt
@@ -25,23 +25,27 @@ import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.github.androidpasswordstore.autofillparser.FormOrigin
+import dagger.hilt.android.AndroidEntryPoint
 import dev.msfjarvis.aps.R
 import dev.msfjarvis.aps.data.password.PasswordItem
 import dev.msfjarvis.aps.databinding.ActivityOreoAutofillFilterBinding
-import dev.msfjarvis.aps.util.FeatureFlags
 import dev.msfjarvis.aps.util.autofill.AutofillMatcher
 import dev.msfjarvis.aps.util.autofill.AutofillPreferences
 import dev.msfjarvis.aps.util.autofill.DirectoryStructure
 import dev.msfjarvis.aps.util.extensions.viewBinding
+import dev.msfjarvis.aps.util.features.Feature
+import dev.msfjarvis.aps.util.features.Features
 import dev.msfjarvis.aps.util.viewmodel.FilterMode
 import dev.msfjarvis.aps.util.viewmodel.ListMode
 import dev.msfjarvis.aps.util.viewmodel.SearchMode
 import dev.msfjarvis.aps.util.viewmodel.SearchableRepositoryAdapter
 import dev.msfjarvis.aps.util.viewmodel.SearchableRepositoryViewModel
+import javax.inject.Inject
 import logcat.LogPriority.ERROR
 import logcat.logcat
 
 @TargetApi(Build.VERSION_CODES.O)
+@AndroidEntryPoint
 class AutofillFilterView : AppCompatActivity() {
 
   companion object {
@@ -76,6 +80,7 @@ class AutofillFilterView : AppCompatActivity() {
     }
   }
 
+  @Inject lateinit var features: Features
   private lateinit var formOrigin: FormOrigin
   private lateinit var directoryStructure: DirectoryStructure
   private val binding by viewBinding(ActivityOreoAutofillFilterBinding::inflate)
@@ -222,7 +227,7 @@ class AutofillFilterView : AppCompatActivity() {
       AutofillMatcher.addMatchFor(applicationContext, formOrigin, item.file)
     // intent?.extras? is checked to be non-null in onCreate
     decryptAction.launch(
-      if (FeatureFlags.ENABLE_PGP_V2_BACKEND) {
+      if (features.isEnabled(Feature.EnablePGPainlessBackend)) {
         AutofillDecryptActivityV2.makeDecryptFileIntent(item.file, intent!!.extras!!, this)
       } else {
         AutofillDecryptActivity.makeDecryptFileIntent(item.file, intent!!.extras!!, this)
diff --git a/app/src/main/java/dev/msfjarvis/aps/ui/autofill/AutofillSaveActivity.kt b/app/src/main/java/dev/msfjarvis/aps/ui/autofill/AutofillSaveActivity.kt
index 49b14ea4..f79ad6a8 100644
--- a/app/src/main/java/dev/msfjarvis/aps/ui/autofill/AutofillSaveActivity.kt
+++ b/app/src/main/java/dev/msfjarvis/aps/ui/autofill/AutofillSaveActivity.kt
@@ -18,19 +18,23 @@ import androidx.core.os.bundleOf
 import com.github.androidpasswordstore.autofillparser.AutofillAction
 import com.github.androidpasswordstore.autofillparser.Credentials
 import com.github.androidpasswordstore.autofillparser.FormOrigin
+import dagger.hilt.android.AndroidEntryPoint
 import dev.msfjarvis.aps.data.repo.PasswordRepository
 import dev.msfjarvis.aps.ui.crypto.PasswordCreationActivity
 import dev.msfjarvis.aps.ui.crypto.PasswordCreationActivityV2
-import dev.msfjarvis.aps.util.FeatureFlags
 import dev.msfjarvis.aps.util.autofill.AutofillMatcher
 import dev.msfjarvis.aps.util.autofill.AutofillPreferences
 import dev.msfjarvis.aps.util.autofill.AutofillResponseBuilder
 import dev.msfjarvis.aps.util.extensions.unsafeLazy
+import dev.msfjarvis.aps.util.features.Feature
+import dev.msfjarvis.aps.util.features.Features
 import java.io.File
+import javax.inject.Inject
 import logcat.LogPriority.ERROR
 import logcat.logcat
 
 @RequiresApi(Build.VERSION_CODES.O)
+@AndroidEntryPoint
 class AutofillSaveActivity : AppCompatActivity() {
 
   companion object {
@@ -105,11 +109,14 @@ class AutofillSaveActivity : AppCompatActivity() {
     }
   }
 
+  @Inject lateinit var features: Features
+
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
     val repo = PasswordRepository.getRepositoryDirectory()
     val creationActivity =
-      if (FeatureFlags.ENABLE_PGP_V2_BACKEND) PasswordCreationActivityV2::class.java
+      if (features.isEnabled(Feature.EnablePGPainlessBackend))
+        PasswordCreationActivityV2::class.java
       else PasswordCreationActivity::class.java
     val saveIntent =
       Intent(this, creationActivity).apply {
diff --git a/app/src/main/java/dev/msfjarvis/aps/ui/crypto/BasePgpActivity.kt b/app/src/main/java/dev/msfjarvis/aps/ui/crypto/BasePgpActivity.kt
index 7c74a621..6ce1c057 100644
--- a/app/src/main/java/dev/msfjarvis/aps/ui/crypto/BasePgpActivity.kt
+++ b/app/src/main/java/dev/msfjarvis/aps/ui/crypto/BasePgpActivity.kt
@@ -24,13 +24,14 @@ import com.google.android.material.snackbar.Snackbar
 import dagger.hilt.android.AndroidEntryPoint
 import dev.msfjarvis.aps.R
 import dev.msfjarvis.aps.injection.prefs.SettingsPreferences
-import dev.msfjarvis.aps.util.FeatureFlags
 import dev.msfjarvis.aps.util.extensions.OPENPGP_PROVIDER
 import dev.msfjarvis.aps.util.extensions.asLog
 import dev.msfjarvis.aps.util.extensions.clipboard
 import dev.msfjarvis.aps.util.extensions.getString
 import dev.msfjarvis.aps.util.extensions.snackbar
 import dev.msfjarvis.aps.util.extensions.unsafeLazy
+import dev.msfjarvis.aps.util.features.Feature
+import dev.msfjarvis.aps.util.features.Features
 import dev.msfjarvis.aps.util.services.ClipboardService
 import dev.msfjarvis.aps.util.settings.PreferenceKeys
 import java.io.File
@@ -63,6 +64,8 @@ open class BasePgpActivity : AppCompatActivity(), OpenPgpServiceConnection.OnBou
   /** [SharedPreferences] instance used by subclasses to persist settings */
   @SettingsPreferences @Inject lateinit var settings: SharedPreferences
 
+  @Inject lateinit var features: Features
+
   /**
    * Handle to the [OpenPgpApi] instance that is used by subclasses to interface with OpenKeychain.
    */
@@ -127,7 +130,7 @@ open class BasePgpActivity : AppCompatActivity(), OpenPgpServiceConnection.OnBou
 
   /** Method for subclasses to initiate binding with [OpenPgpServiceConnection]. */
   fun bindToOpenKeychain(onBoundListener: OpenPgpServiceConnection.OnBound) {
-    if (FeatureFlags.ENABLE_PGP_V2_BACKEND) return
+    if (features.isEnabled(Feature.EnablePGPainlessBackend)) return
     val installed =
       runCatching {
           packageManager.getPackageInfo(OPENPGP_PROVIDER, 0)
diff --git a/app/src/main/java/dev/msfjarvis/aps/ui/passwords/PasswordStore.kt b/app/src/main/java/dev/msfjarvis/aps/ui/passwords/PasswordStore.kt
index b42c30e9..d80959b8 100644
--- a/app/src/main/java/dev/msfjarvis/aps/ui/passwords/PasswordStore.kt
+++ b/app/src/main/java/dev/msfjarvis/aps/ui/passwords/PasswordStore.kt
@@ -47,7 +47,6 @@ import dev.msfjarvis.aps.ui.git.base.BaseGitActivity
 import dev.msfjarvis.aps.ui.onboarding.activity.OnboardingActivity
 import dev.msfjarvis.aps.ui.settings.DirectorySelectionActivity
 import dev.msfjarvis.aps.ui.settings.SettingsActivity
-import dev.msfjarvis.aps.util.FeatureFlags
 import dev.msfjarvis.aps.util.autofill.AutofillMatcher
 import dev.msfjarvis.aps.util.extensions.base64
 import dev.msfjarvis.aps.util.extensions.commitChange
@@ -57,6 +56,8 @@ import dev.msfjarvis.aps.util.extensions.isInsideRepository
 import dev.msfjarvis.aps.util.extensions.isPermissionGranted
 import dev.msfjarvis.aps.util.extensions.listFilesRecursively
 import dev.msfjarvis.aps.util.extensions.sharedPrefs
+import dev.msfjarvis.aps.util.features.Feature
+import dev.msfjarvis.aps.util.features.Features
 import dev.msfjarvis.aps.util.settings.AuthMode
 import dev.msfjarvis.aps.util.settings.PreferenceKeys
 import dev.msfjarvis.aps.util.shortcuts.ShortcutHandler
@@ -76,6 +77,7 @@ const val PASSWORD_FRAGMENT_TAG = "PasswordsList"
 @AndroidEntryPoint
 class PasswordStore : BaseGitActivity() {
 
+  @Inject lateinit var features: Features
   @Inject lateinit var shortcutHandler: ShortcutHandler
   private lateinit var searchItem: MenuItem
   private val settings by lazy { sharedPrefs }
@@ -428,7 +430,7 @@ class PasswordStore : BaseGitActivity() {
       (authDecryptIntent.clone() as Intent).setComponent(
         ComponentName(
           this,
-          if (FeatureFlags.ENABLE_PGP_V2_BACKEND) {
+          if (features.isEnabled(Feature.EnablePGPainlessBackend)) {
             DecryptActivityV2::class.java
           } else {
             DecryptActivity::class.java
@@ -458,7 +460,8 @@ class PasswordStore : BaseGitActivity() {
     val currentDir = currentDir
     logcat(INFO) { "Adding file to : ${currentDir.absolutePath}" }
     val creationActivity =
-      if (FeatureFlags.ENABLE_PGP_V2_BACKEND) PasswordCreationActivityV2::class.java
+      if (features.isEnabled(Feature.EnablePGPainlessBackend))
+        PasswordCreationActivityV2::class.java
       else PasswordCreationActivity::class.java
     val intent = Intent(this, creationActivity)
     intent.putExtra(BasePgpActivity.EXTRA_FILE_PATH, currentDir.absolutePath)
diff --git a/app/src/main/java/dev/msfjarvis/aps/ui/settings/PGPSettings.kt b/app/src/main/java/dev/msfjarvis/aps/ui/settings/PGPSettings.kt
index 81418ccb..86f23c32 100644
--- a/app/src/main/java/dev/msfjarvis/aps/ui/settings/PGPSettings.kt
+++ b/app/src/main/java/dev/msfjarvis/aps/ui/settings/PGPSettings.kt
@@ -7,15 +7,21 @@ package dev.msfjarvis.aps.ui.settings
 
 import androidx.fragment.app.FragmentActivity
 import de.Maxr1998.modernpreferences.PreferenceScreen
+import de.Maxr1998.modernpreferences.helpers.checkBox
 import de.Maxr1998.modernpreferences.helpers.onClick
 import de.Maxr1998.modernpreferences.helpers.pref
 import dev.msfjarvis.aps.ui.pgp.PGPKeyImportActivity
 import dev.msfjarvis.aps.util.extensions.launchActivity
+import dev.msfjarvis.aps.util.features.Feature
 
 class PGPSettings(private val activity: FragmentActivity) : SettingsProvider {
 
   override fun provideSettings(builder: PreferenceScreen.Builder) {
     builder.apply {
+      checkBox(Feature.EnablePGPainlessBackend.configKey) {
+        title = "Enable new PGP backend"
+        persistent = true
+      }
       pref("_") {
         title = "Import PGP key"
         persistent = false
diff --git a/app/src/main/java/dev/msfjarvis/aps/util/autofill/Api30AutofillResponseBuilder.kt b/app/src/main/java/dev/msfjarvis/aps/util/autofill/Api30AutofillResponseBuilder.kt
index fd8faa7f..22f2db85 100644
--- a/app/src/main/java/dev/msfjarvis/aps/util/autofill/Api30AutofillResponseBuilder.kt
+++ b/app/src/main/java/dev/msfjarvis/aps/util/autofill/Api30AutofillResponseBuilder.kt
@@ -19,13 +19,17 @@ import com.github.androidpasswordstore.autofillparser.AutofillAction
 import com.github.androidpasswordstore.autofillparser.FillableForm
 import com.github.androidpasswordstore.autofillparser.fillWith
 import com.github.michaelbull.result.fold
+import dagger.assisted.Assisted
+import dagger.assisted.AssistedFactory
+import dagger.assisted.AssistedInject
 import dev.msfjarvis.aps.autofill.oreo.ui.AutofillSmsActivity
 import dev.msfjarvis.aps.ui.autofill.AutofillDecryptActivity
 import dev.msfjarvis.aps.ui.autofill.AutofillDecryptActivityV2
 import dev.msfjarvis.aps.ui.autofill.AutofillFilterView
 import dev.msfjarvis.aps.ui.autofill.AutofillPublisherChangedActivity
 import dev.msfjarvis.aps.ui.autofill.AutofillSaveActivity
-import dev.msfjarvis.aps.util.FeatureFlags
+import dev.msfjarvis.aps.util.features.Feature
+import dev.msfjarvis.aps.util.features.Features
 import java.io.File
 import logcat.LogPriority.ERROR
 import logcat.asLog
@@ -33,7 +37,17 @@ import logcat.logcat
 
 /** Implements [AutofillResponseBuilder]'s methods for API 30 and above */
 @RequiresApi(Build.VERSION_CODES.R)
-class Api30AutofillResponseBuilder(form: FillableForm) {
+class Api30AutofillResponseBuilder
+@AssistedInject
+constructor(
+  @Assisted form: FillableForm,
+  private val features: Features,
+) {
+
+  @AssistedFactory
+  interface Factory {
+    fun create(form: FillableForm): Api30AutofillResponseBuilder
+  }
 
   private val formOrigin = form.formOrigin
   private val scenario = form.scenario
@@ -73,7 +87,7 @@ class Api30AutofillResponseBuilder(form: FillableForm) {
     if (!scenario.hasFieldsToFillOn(AutofillAction.Match)) return null
     val metadata = makeFillMatchMetadata(context, file)
     val intentSender =
-      if (FeatureFlags.ENABLE_PGP_V2_BACKEND) {
+      if (features.isEnabled(Feature.EnablePGPainlessBackend)) {
         AutofillDecryptActivityV2.makeDecryptFileIntentSender(file, context)
       } else {
         AutofillDecryptActivity.makeDecryptFileIntentSender(file, context)
diff --git a/app/src/main/java/dev/msfjarvis/aps/util/autofill/AutofillResponseBuilder.kt b/app/src/main/java/dev/msfjarvis/aps/util/autofill/AutofillResponseBuilder.kt
index 723347f2..5c1c91d6 100644
--- a/app/src/main/java/dev/msfjarvis/aps/util/autofill/AutofillResponseBuilder.kt
+++ b/app/src/main/java/dev/msfjarvis/aps/util/autofill/AutofillResponseBuilder.kt
@@ -19,20 +19,34 @@ import com.github.androidpasswordstore.autofillparser.Credentials
 import com.github.androidpasswordstore.autofillparser.FillableForm
 import com.github.androidpasswordstore.autofillparser.fillWith
 import com.github.michaelbull.result.fold
+import dagger.assisted.Assisted
+import dagger.assisted.AssistedFactory
+import dagger.assisted.AssistedInject
 import dev.msfjarvis.aps.autofill.oreo.ui.AutofillSmsActivity
 import dev.msfjarvis.aps.ui.autofill.AutofillDecryptActivity
 import dev.msfjarvis.aps.ui.autofill.AutofillDecryptActivityV2
 import dev.msfjarvis.aps.ui.autofill.AutofillFilterView
 import dev.msfjarvis.aps.ui.autofill.AutofillPublisherChangedActivity
 import dev.msfjarvis.aps.ui.autofill.AutofillSaveActivity
-import dev.msfjarvis.aps.util.FeatureFlags
+import dev.msfjarvis.aps.util.features.Feature
+import dev.msfjarvis.aps.util.features.Features
 import java.io.File
 import logcat.LogPriority.ERROR
 import logcat.asLog
 import logcat.logcat
 
 @RequiresApi(Build.VERSION_CODES.O)
-class AutofillResponseBuilder(form: FillableForm) {
+class AutofillResponseBuilder
+@AssistedInject
+constructor(
+  @Assisted form: FillableForm,
+  private val features: Features,
+) {
+
+  @AssistedFactory
+  interface Factory {
+    fun create(form: FillableForm): AutofillResponseBuilder
+  }
 
   private val formOrigin = form.formOrigin
   private val scenario = form.scenario
@@ -61,7 +75,7 @@ class AutofillResponseBuilder(form: FillableForm) {
     if (!scenario.hasFieldsToFillOn(AutofillAction.Match)) return null
     val metadata = makeFillMatchMetadata(context, file)
     val intentSender =
-      if (FeatureFlags.ENABLE_PGP_V2_BACKEND) {
+      if (features.isEnabled(Feature.EnablePGPainlessBackend)) {
         AutofillDecryptActivityV2.makeDecryptFileIntentSender(file, context)
       } else {
         AutofillDecryptActivity.makeDecryptFileIntentSender(file, context)
diff --git a/app/src/main/java/dev/msfjarvis/aps/util/features/Feature.kt b/app/src/main/java/dev/msfjarvis/aps/util/features/Feature.kt
new file mode 100644
index 00000000..7ae2e642
--- /dev/null
+++ b/app/src/main/java/dev/msfjarvis/aps/util/features/Feature.kt
@@ -0,0 +1,18 @@
+/*
+ * Copyright © 2014-2022 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package dev.msfjarvis.aps.util.features
+
+/** List of all feature flags for the app. */
+enum class Feature(
+  /** Default value for the flag. */
+  val defaultValue: Boolean,
+  /** Key to retrieve the current value for the flag. */
+  val configKey: String,
+) {
+
+  /** Opt into the new PGP backend powered by the PGPainless library. */
+  EnablePGPainlessBackend(false, "enable_pgp_v2_backend"),
+}
diff --git a/app/src/main/java/dev/msfjarvis/aps/util/features/Features.kt b/app/src/main/java/dev/msfjarvis/aps/util/features/Features.kt
new file mode 100644
index 00000000..39b2c3a8
--- /dev/null
+++ b/app/src/main/java/dev/msfjarvis/aps/util/features/Features.kt
@@ -0,0 +1,21 @@
+/*
+ * Copyright © 2014-2022 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package dev.msfjarvis.aps.util.features
+
+import android.content.SharedPreferences
+import dev.msfjarvis.aps.injection.prefs.SettingsPreferences
+import javax.inject.Inject
+
+class Features
+@Inject
+constructor(
+  @SettingsPreferences private val preferences: SharedPreferences,
+) {
+
+  fun isEnabled(feature: Feature): Boolean {
+    return preferences.getBoolean(feature.configKey, feature.defaultValue)
+  }
+}
diff --git a/app/src/main/java/dev/msfjarvis/aps/util/services/OreoAutofillService.kt b/app/src/main/java/dev/msfjarvis/aps/util/services/OreoAutofillService.kt
index a52caff0..7b804f3e 100644
--- a/app/src/main/java/dev/msfjarvis/aps/util/services/OreoAutofillService.kt
+++ b/app/src/main/java/dev/msfjarvis/aps/util/services/OreoAutofillService.kt
@@ -23,6 +23,7 @@ import com.github.androidpasswordstore.autofillparser.cachePublicSuffixList
 import com.github.androidpasswordstore.autofillparser.passwordValue
 import com.github.androidpasswordstore.autofillparser.recoverNodes
 import com.github.androidpasswordstore.autofillparser.usernameValue
+import dagger.hilt.android.AndroidEntryPoint
 import dev.msfjarvis.aps.BuildConfig
 import dev.msfjarvis.aps.R
 import dev.msfjarvis.aps.ui.autofill.AutofillSaveActivity
@@ -32,10 +33,12 @@ import dev.msfjarvis.aps.util.extensions.getString
 import dev.msfjarvis.aps.util.extensions.hasFlag
 import dev.msfjarvis.aps.util.extensions.sharedPrefs
 import dev.msfjarvis.aps.util.settings.PreferenceKeys
+import javax.inject.Inject
 import logcat.LogPriority.ERROR
 import logcat.logcat
 
 @RequiresApi(Build.VERSION_CODES.O)
+@AndroidEntryPoint
 class OreoAutofillService : AutofillService() {
 
   companion object {
@@ -55,6 +58,9 @@ class OreoAutofillService : AutofillService() {
     private const val DISABLE_AUTOFILL_DURATION_MS = 1000 * 60 * 60 * 24L
   }
 
+  @Inject lateinit var api30ResponseBuilderFactory: Api30AutofillResponseBuilder.Factory
+  @Inject lateinit var responseBuilderFactory: AutofillResponseBuilder.Factory
+
   override fun onCreate() {
     super.onCreate()
     cachePublicSuffixList(applicationContext)
@@ -97,10 +103,11 @@ class OreoAutofillService : AutofillService() {
           return
         }
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-      Api30AutofillResponseBuilder(formToFill)
+      api30ResponseBuilderFactory
+        .create(formToFill)
         .fillCredentials(this, request.inlineSuggestionsRequest, callback)
     } else {
-      AutofillResponseBuilder(formToFill).fillCredentials(this, callback)
+      responseBuilderFactory.create(formToFill).fillCredentials(this, callback)
     }
   }