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/*
* Copyright © 2014-2021 The Android Password Store Authors. All Rights Reserved.
* SPDX-License-Identifier: GPL-3.0-only
*/
package dev.msfjarvis.aps.util.autofill
import android.content.Context
import android.content.IntentSender
import android.os.Build
import android.os.Bundle
import android.service.autofill.Dataset
import android.service.autofill.FillCallback
import android.service.autofill.FillResponse
import android.service.autofill.SaveInfo
import androidx.annotation.RequiresApi
import com.github.ajalt.timberkt.e
import com.github.androidpasswordstore.autofillparser.AutofillAction
import com.github.androidpasswordstore.autofillparser.AutofillScenario
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 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 java.io.File
@RequiresApi(Build.VERSION_CODES.O)
class AutofillResponseBuilder(form: FillableForm) {
private val formOrigin = form.formOrigin
private val scenario = form.scenario
private val ignoredIds = form.ignoredIds
private val saveFlags = form.saveFlags
private val clientState = form.toClientState()
// We do not offer save when the only relevant field is a username field or there is no field.
private val scenarioSupportsSave = scenario.hasPasswordFieldsToSave
private val canBeSaved = saveFlags != null && scenarioSupportsSave
private fun makeIntentDataset(
context: Context,
action: AutofillAction,
intentSender: IntentSender,
metadata: DatasetMetadata,
): Dataset {
return Dataset.Builder(makeRemoteView(context, metadata)).run {
fillWith(scenario, action, credentials = null)
setAuthentication(intentSender)
build()
}
}
private fun makeMatchDataset(context: Context, file: File): Dataset? {
if (!scenario.hasFieldsToFillOn(AutofillAction.Match)) return null
val metadata = makeFillMatchMetadata(context, file)
val intentSender =
if (FeatureFlags.ENABLE_PGP_V2_BACKEND) {
AutofillDecryptActivityV2.makeDecryptFileIntentSender(file, context)
} else {
AutofillDecryptActivity.makeDecryptFileIntentSender(file, context)
}
return makeIntentDataset(context, AutofillAction.Match, intentSender, metadata)
}
private fun makeSearchDataset(context: Context): Dataset? {
if (!scenario.hasFieldsToFillOn(AutofillAction.Search)) return null
val metadata = makeSearchAndFillMetadata(context)
val intentSender = AutofillFilterView.makeMatchAndDecryptFileIntentSender(context, formOrigin)
return makeIntentDataset(context, AutofillAction.Search, intentSender, metadata)
}
private fun makeGenerateDataset(context: Context): Dataset? {
if (!scenario.hasFieldsToFillOn(AutofillAction.Generate)) return null
val metadata = makeGenerateAndFillMetadata(context)
val intentSender = AutofillSaveActivity.makeSaveIntentSender(context, null, formOrigin)
return makeIntentDataset(context, AutofillAction.Generate, intentSender, metadata)
}
private fun makeFillOtpFromSmsDataset(context: Context): Dataset? {
if (!scenario.hasFieldsToFillOn(AutofillAction.FillOtpFromSms)) return null
if (!AutofillSmsActivity.shouldOfferFillFromSms(context)) return null
val metadata = makeFillOtpFromSmsMetadata(context)
val intentSender = AutofillSmsActivity.makeFillOtpFromSmsIntentSender(context)
return makeIntentDataset(context, AutofillAction.FillOtpFromSms, intentSender, metadata)
}
private fun makePublisherChangedDataset(
context: Context,
publisherChangedException: AutofillPublisherChangedException,
): Dataset {
val metadata = makeWarningMetadata(context)
// If the user decides to trust the new publisher, they can choose reset the list of
// matches. In this case we need to immediately show a new `FillResponse` as if the app were
// autofilled for the first time. This `FillResponse` needs to be returned as a result from
// `AutofillPublisherChangedActivity`, which is why we create and pass it on here.
val fillResponseAfterReset = makeFillResponse(context, emptyList())
val intentSender =
AutofillPublisherChangedActivity.makePublisherChangedIntentSender(
context,
publisherChangedException,
fillResponseAfterReset
)
return makeIntentDataset(context, AutofillAction.Match, intentSender, metadata)
}
private fun makePublisherChangedResponse(
context: Context,
publisherChangedException: AutofillPublisherChangedException
): FillResponse {
return FillResponse.Builder().run {
addDataset(makePublisherChangedDataset(context, publisherChangedException))
setIgnoredIds(*ignoredIds.toTypedArray())
build()
}
}
// TODO: Support multi-step authentication flows in apps via FLAG_DELAY_SAVE
// See:
// https://developer.android.com/reference/android/service/autofill/SaveInfo#FLAG_DELAY_SAVE
private fun makeSaveInfo(): SaveInfo? {
if (!canBeSaved) return null
check(saveFlags != null)
val idsToSave = scenario.fieldsToSave.toTypedArray()
if (idsToSave.isEmpty()) return null
var saveDataTypes = SaveInfo.SAVE_DATA_TYPE_PASSWORD
if (scenario.hasUsername) {
saveDataTypes = saveDataTypes or SaveInfo.SAVE_DATA_TYPE_USERNAME
}
return SaveInfo.Builder(saveDataTypes, idsToSave).run {
setFlags(saveFlags)
build()
}
}
private fun makeFillResponse(context: Context, matchedFiles: List<File>): FillResponse? {
var datasetCount = 0
return FillResponse.Builder().run {
for (file in matchedFiles) {
makeMatchDataset(context, file)?.let {
datasetCount++
addDataset(it)
}
}
makeGenerateDataset(context)?.let {
datasetCount++
addDataset(it)
}
makeFillOtpFromSmsDataset(context)?.let {
datasetCount++
addDataset(it)
}
makeSearchDataset(context)?.let {
datasetCount++
addDataset(it)
}
if (datasetCount == 0) return null
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
setHeader(
makeRemoteView(
context,
makeHeaderMetadata(formOrigin.getPrettyIdentifier(context, untrusted = true))
)
)
}
makeSaveInfo()?.let { setSaveInfo(it) }
setClientState(clientState)
setIgnoredIds(*ignoredIds.toTypedArray())
build()
}
}
/** Creates and returns a suitable [FillResponse] to the Autofill framework. */
fun fillCredentials(context: Context, callback: FillCallback) {
AutofillMatcher.getMatchesFor(context, formOrigin)
.fold(
success = { matchedFiles -> callback.onSuccess(makeFillResponse(context, matchedFiles)) },
failure = { e ->
e(e)
callback.onSuccess(makePublisherChangedResponse(context, e))
}
)
}
companion object {
fun makeFillInDataset(
context: Context,
credentials: Credentials,
clientState: Bundle,
action: AutofillAction
): Dataset {
val scenario = AutofillScenario.fromClientState(clientState)
// Before Android P, Datasets used for fill-in had to come with a RemoteViews, even
// though they are rarely shown.
// FIXME: We should clone the original dataset here and add the credentials to be filled
// in. Otherwise, the entry in the cached list of datasets will be overwritten by the
// fill-in dataset without any visual representation. This causes it to be missing from
// the Autofill suggestions shown after the user clears the filled out form fields.
val builder =
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
Dataset.Builder()
} else {
Dataset.Builder(makeRemoteView(context, makeEmptyMetadata()))
}
return builder.run {
if (scenario != null) fillWith(scenario, action, credentials)
else e { "Failed to recover scenario from client state" }
build()
}
}
}
}
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