Resolve Autofill breakage below API 30 (#1187)

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

app/src/main/java/com/zeapo/pwdstore/autofill/oreo/Api30AutofillResponseBuilder.kt

@@ -0,0 +1,189 @@
+/*
+ * Copyright © 2014-2020 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package com.zeapo.pwdstore.autofill.oreo
+
+import android.content.Context
+import android.content.IntentSender
+import android.os.Build
+import android.service.autofill.Dataset
+import android.service.autofill.FillCallback
+import android.service.autofill.FillResponse
+import android.service.autofill.SaveInfo
+import android.view.inputmethod.InlineSuggestionsRequest
+import android.widget.inline.InlinePresentationSpec
+import androidx.annotation.RequiresApi
+import com.github.ajalt.timberkt.e
+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 com.zeapo.pwdstore.autofill.oreo.ui.AutofillDecryptActivity
+import com.zeapo.pwdstore.autofill.oreo.ui.AutofillFilterView
+import com.zeapo.pwdstore.autofill.oreo.ui.AutofillPublisherChangedActivity
+import com.zeapo.pwdstore.autofill.oreo.ui.AutofillSaveActivity
+import com.zeapo.pwdstore.autofill.oreo.ui.AutofillSmsActivity
+import java.io.File
+
+/**
+ * Implements [AutofillResponseBuilder]'s methods for API 30 and above
+ */
+@RequiresApi(Build.VERSION_CODES.R)
+class Api30AutofillResponseBuilder(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,
+        imeSpec: InlinePresentationSpec?,
+    ): Dataset {
+        return Dataset.Builder(makeRemoteView(context, metadata)).run {
+            fillWith(scenario, action, credentials = null)
+            setAuthentication(intentSender)
+            if (imeSpec != null) {
+                val inlinePresentation = makeInlinePresentation(context, imeSpec, metadata)
+                if (inlinePresentation != null) {
+                    setInlinePresentation(inlinePresentation)
+                }
+            }
+            build()
+        }
+    }
+
+    private fun makeMatchDataset(context: Context, file: File, imeSpec: InlinePresentationSpec?): Dataset? {
+        if (!scenario.hasFieldsToFillOn(AutofillAction.Match)) return null
+        val metadata = makeFillMatchMetadata(context, file)
+        val intentSender = AutofillDecryptActivity.makeDecryptFileIntentSender(file, context)
+        return makeIntentDataset(context, AutofillAction.Match, intentSender, metadata, imeSpec)
+    }
+
+    private fun makeSearchDataset(context: Context, imeSpec: InlinePresentationSpec?): 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, imeSpec)
+    }
+
+    private fun makeGenerateDataset(context: Context, imeSpec: InlinePresentationSpec?): 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, imeSpec)
+    }
+
+
+    private fun makeFillOtpFromSmsDataset(context: Context, imeSpec: InlinePresentationSpec?): 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, imeSpec)
+    }
+
+    private fun makePublisherChangedDataset(
+        context: Context,
+        publisherChangedException: AutofillPublisherChangedException,
+        imeSpec: InlinePresentationSpec?
+    ): 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, null, emptyList())
+        val intentSender = AutofillPublisherChangedActivity.makePublisherChangedIntentSender(
+            context, publisherChangedException, fillResponseAfterReset
+        )
+        return makeIntentDataset(context, AutofillAction.Match, intentSender, metadata, imeSpec)
+    }
+
+    private fun makePublisherChangedResponse(
+        context: Context,
+        inlineSuggestionsRequest: InlineSuggestionsRequest?,
+        publisherChangedException: AutofillPublisherChangedException
+    ): FillResponse {
+        val imeSpec = inlineSuggestionsRequest?.inlinePresentationSpecs?.firstOrNull()
+        return FillResponse.Builder().run {
+            addDataset(makePublisherChangedDataset(context, publisherChangedException, imeSpec))
+            setIgnoredIds(*ignoredIds.toTypedArray())
+            build()
+        }
+    }
+
+    private fun makeFillResponse(context: Context, inlineSuggestionsRequest: InlineSuggestionsRequest?, matchedFiles: List<File>): FillResponse? {
+        var datasetCount = 0
+        val imeSpecs = inlineSuggestionsRequest?.inlinePresentationSpecs ?: emptyList()
+        return FillResponse.Builder().run {
+            for (file in matchedFiles) {
+                makeMatchDataset(context, file, imeSpecs.getOrNull(datasetCount))?.let {
+                    datasetCount++
+                    addDataset(it)
+                }
+            }
+            makeSearchDataset(context, imeSpecs.getOrNull(datasetCount))?.let {
+                datasetCount++
+                addDataset(it)
+            }
+            makeGenerateDataset(context, imeSpecs.getOrNull(datasetCount))?.let {
+                datasetCount++
+                addDataset(it)
+            }
+            makeFillOtpFromSmsDataset(context, imeSpecs.getOrNull(datasetCount))?.let {
+                datasetCount++
+                addDataset(it)
+            }
+            if (datasetCount == 0) return null
+            setHeader(makeRemoteView(context, makeHeaderMetadata(formOrigin.getPrettyIdentifier(context, untrusted = true))))
+            makeSaveInfo()?.let { setSaveInfo(it) }
+            setClientState(clientState)
+            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()
+        }
+    }
+
+    /**
+     * Creates and returns a suitable [FillResponse] to the Autofill framework.
+     */
+    fun fillCredentials(context: Context, inlineSuggestionsRequest: InlineSuggestionsRequest?, callback: FillCallback) {
+        AutofillMatcher.getMatchesFor(context, formOrigin).fold(
+            success = { matchedFiles ->
+                callback.onSuccess(makeFillResponse(context, inlineSuggestionsRequest, matchedFiles))
+            },
+            failure = { e ->
+                e(e)
+                callback.onSuccess(makePublisherChangedResponse(context, inlineSuggestionsRequest, e))
+            }
+        )
+    }
+}

app/src/main/java/com/zeapo/pwdstore/autofill/oreo/AutofillResponseBuilder.kt

@@ -12,8 +12,6 @@ import android.service.autofill.Dataset
 import android.service.autofill.FillCallback
 import android.service.autofill.FillResponse
 import android.service.autofill.SaveInfo
-import android.view.inputmethod.InlineSuggestionsRequest
-import android.widget.inline.InlinePresentationSpec
 import androidx.annotation.RequiresApi
 import com.github.ajalt.timberkt.e
 import com.github.androidpasswordstore.autofillparser.AutofillAction
@@ -46,80 +44,67 @@ class AutofillResponseBuilder(form: FillableForm) {
         action: AutofillAction,
         intentSender: IntentSender,
         metadata: DatasetMetadata,
-        imeSpec: InlinePresentationSpec?,
     ): Dataset {
         return Dataset.Builder(makeRemoteView(context, metadata)).run {
             fillWith(scenario, action, credentials = null)
             setAuthentication(intentSender)
-            if (imeSpec != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-                val inlinePresentation = makeInlinePresentation(context, imeSpec, metadata)
-                if (inlinePresentation != null) {
-                    setInlinePresentation(inlinePresentation)
-                }
-            }
             build()
         }
     }
 
-    private fun makeMatchDataset(context: Context, file: File, imeSpec: InlinePresentationSpec?): Dataset? {
+    private fun makeMatchDataset(context: Context, file: File): Dataset? {
         if (!scenario.hasFieldsToFillOn(AutofillAction.Match)) return null
         val metadata = makeFillMatchMetadata(context, file)
         val intentSender = AutofillDecryptActivity.makeDecryptFileIntentSender(file, context)
-        return makeIntentDataset(context, AutofillAction.Match, intentSender, metadata, imeSpec)
+        return makeIntentDataset(context, AutofillAction.Match, intentSender, metadata)
     }
 
-    private fun makeSearchDataset(context: Context, imeSpec: InlinePresentationSpec?): Dataset? {
+
+    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, imeSpec)
+        return makeIntentDataset(context, AutofillAction.Search, intentSender, metadata)
     }
 
-    private fun makeGenerateDataset(context: Context, imeSpec: InlinePresentationSpec?): Dataset? {
+    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, imeSpec)
+        return makeIntentDataset(context, AutofillAction.Generate, intentSender, metadata)
     }
 
-    private fun makeFillOtpFromSmsDataset(context: Context, imeSpec: InlinePresentationSpec?): Dataset? {
+    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, imeSpec)
+        return makeIntentDataset(context, AutofillAction.FillOtpFromSms, intentSender, metadata)
     }
 
     private fun makePublisherChangedDataset(
         context: Context,
         publisherChangedException: AutofillPublisherChangedException,
-        imeSpec: InlinePresentationSpec?
     ): 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, null, emptyList())
+        val fillResponseAfterReset = makeFillResponse(context, emptyList())
         val intentSender = AutofillPublisherChangedActivity.makePublisherChangedIntentSender(
             context, publisherChangedException, fillResponseAfterReset
         )
-        return makeIntentDataset(context, AutofillAction.Match, intentSender, metadata, imeSpec)
+        return makeIntentDataset(context, AutofillAction.Match, intentSender, metadata)
     }
 
     private fun makePublisherChangedResponse(
         context: Context,
-        inlineSuggestionsRequest: InlineSuggestionsRequest?,
         publisherChangedException: AutofillPublisherChangedException
     ): FillResponse {
-        val imeSpec = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-            inlineSuggestionsRequest?.inlinePresentationSpecs?.firstOrNull()
-        } else {
-            null
-        }
         return FillResponse.Builder().run {
-            addDataset(makePublisherChangedDataset(context, publisherChangedException, imeSpec))
+            addDataset(makePublisherChangedDataset(context, publisherChangedException))
             setIgnoredIds(*ignoredIds.toTypedArray())
             build()
         }
@@ -142,29 +127,24 @@ class AutofillResponseBuilder(form: FillableForm) {
         }
     }
 
-    private fun makeFillResponse(context: Context, inlineSuggestionsRequest: InlineSuggestionsRequest?, matchedFiles: List<File>): FillResponse? {
+    private fun makeFillResponse(context: Context, matchedFiles: List<File>): FillResponse? {
         var datasetCount = 0
-        val imeSpecs: List<InlinePresentationSpec> = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-            inlineSuggestionsRequest?.inlinePresentationSpecs
-        } else {
-            null
-        } ?: emptyList()
         return FillResponse.Builder().run {
             for (file in matchedFiles) {
-                makeMatchDataset(context, file, imeSpecs.getOrNull(datasetCount))?.let {
+                makeMatchDataset(context, file)?.let {
                     datasetCount++
                     addDataset(it)
                 }
             }
-            makeSearchDataset(context, imeSpecs.getOrNull(datasetCount))?.let {
+            makeSearchDataset(context)?.let {
                 datasetCount++
                 addDataset(it)
             }
-            makeGenerateDataset(context, imeSpecs.getOrNull(datasetCount))?.let {
+            makeGenerateDataset(context)?.let {
                 datasetCount++
                 addDataset(it)
             }
-            makeFillOtpFromSmsDataset(context, imeSpecs.getOrNull(datasetCount))?.let {
+            makeFillOtpFromSmsDataset(context)?.let {
                 datasetCount++
                 addDataset(it)
             }
@@ -182,14 +162,14 @@ class AutofillResponseBuilder(form: FillableForm) {
     /**
      * Creates and returns a suitable [FillResponse] to the Autofill framework.
      */
-    fun fillCredentials(context: Context, inlineSuggestionsRequest: InlineSuggestionsRequest?, callback: FillCallback) {
+    fun fillCredentials(context: Context, callback: FillCallback) {
         AutofillMatcher.getMatchesFor(context, formOrigin).fold(
             success = { matchedFiles ->
-                callback.onSuccess(makeFillResponse(context, inlineSuggestionsRequest, matchedFiles))
+                callback.onSuccess(makeFillResponse(context, matchedFiles))
             },
             failure = { e ->
                 e(e)
-                callback.onSuccess(makePublisherChangedResponse(context, inlineSuggestionsRequest, e))
+                callback.onSuccess(makePublisherChangedResponse(context, e))
             }
         )
     }

app/src/main/java/com/zeapo/pwdstore/autofill/oreo/OreoAutofillService.kt

@@ -86,13 +86,11 @@ class OreoAutofillService : AutofillService() {
             callback.onSuccess(null)
             return
         }
-        val inlineSuggestionsRequest =
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-                request.inlineSuggestionsRequest
+            Api30AutofillResponseBuilder(formToFill).fillCredentials(this, request.inlineSuggestionsRequest, callback)
         } else {
-                null
+            AutofillResponseBuilder(formToFill).fillCredentials(this, callback)
         }
-        AutofillResponseBuilder(formToFill).fillCredentials(this, inlineSuggestionsRequest, callback)
     }
 
     override fun onSaveRequest(request: SaveRequest, callback: SaveCallback) {