Suppress system AutofillService save prompts to prevent it overlappin…

…g in-browser save prompts (#3840)

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Task/Issue URL:
https://app.asana.com/0/608920331025315/1205657473475434/f

### Description
Prevent an overlap occurring between the system AutofillService save
prompt and the in-browser save prompt. Note, this isn't fool proof and
there is at least one known site where it doesn't prevent both showing,
but it's a UX improvement on majority of sites.

### Steps to test this PR

To test this properly, ensure your Android version is >= Android 8.0
(API 26) and that you have a system-level Autofill provider set up
(otherwise you would never have seen the system prompt anyway, so the
suppression isn't being tested). You can verify this here:
- Visit settings, languages & input, autofill service (or you might have
to search for it in settings if OEM has put it somewhere else)

<img
src="https://github.com/duckduckgo/Android/assets/1336281/75ca068b-549d-4cca-a79a-f029af76b86e"
width="30%" />

<hr />

**Steps**
- [x] Install `internal` app build
- [x] Visit https://fill.dev/form/login-simple; enter username, password
and tap login button
- [x] Verify you only see our save prompt, and not the system (e.g.,
Google Password Manager) save prompt

### UI changes


![combined](https://github.com/duckduckgo/Android/assets/1336281/645e6943-7c64-47fd-88b1-f6dfedd64e5c)

autofill/autofill-impl/src/main/java/com/duckduckgo/autofill/impl/AutofillJavascriptInterface.kt

@@ -47,6 +47,7 @@ import com.duckduckgo.autofill.impl.jsbridge.request.SupportedAutofillTriggerTyp
 import com.duckduckgo.autofill.impl.jsbridge.request.SupportedAutofillTriggerType.USER_INITIATED
 import com.duckduckgo.autofill.impl.jsbridge.response.AutofillResponseWriter
 import com.duckduckgo.autofill.impl.sharedcreds.ShareableCredentials
+import com.duckduckgo.autofill.impl.systemautofill.SystemAutofillServiceSuppressor
 import com.duckduckgo.autofill.impl.ui.credential.passwordgeneration.Actions
 import com.duckduckgo.autofill.impl.ui.credential.passwordgeneration.Actions.DeleteAutoLogin
 import com.duckduckgo.autofill.impl.ui.credential.passwordgeneration.Actions.DiscardAutoLoginId
@@ -110,6 +111,7 @@ class AutofillStoredBackJavascriptInterface @Inject constructor(
     private val inContextDataStore: EmailProtectionInContextDataStore,
     private val recentInstallChecker: EmailProtectionInContextRecentInstallChecker,
     private val loginDeduplicator: AutofillLoginDeduplicator,
+    private val systemAutofillServiceSuppressor: SystemAutofillServiceSuppressor,
 ) : AutofillJavascriptInterface {
 
     override var callback: Callback? = null
@@ -248,6 +250,9 @@ class AutofillStoredBackJavascriptInterface @Inject constructor(
 
     @JavascriptInterface
     fun storeFormData(data: String) {
+        // important to call suppressor as soon as possible
+        systemAutofillServiceSuppressor.suppressAutofill(webView)
+
         Timber.i("storeFormData called, credentials provided to be persisted")
 
         storeFormDataJob += coroutineScope.launch(dispatcherProvider.default()) {

autofill/autofill-impl/src/main/java/com/duckduckgo/autofill/impl/systemautofill/SystemAutofillServiceSuppressor.kt

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2023 DuckDuckGo
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.duckduckgo.autofill.impl.systemautofill
+
+import android.annotation.SuppressLint
+import android.os.Build
+import android.view.autofill.AutofillManager
+import android.webkit.WebView
+import com.duckduckgo.appbuildconfig.api.AppBuildConfig
+import com.duckduckgo.di.scopes.AppScope
+import com.squareup.anvil.annotations.ContributesBinding
+import javax.inject.Inject
+
+interface SystemAutofillServiceSuppressor {
+    fun suppressAutofill(webView: WebView?)
+}
+
+@ContributesBinding(AppScope::class)
+class RealSystemAutofillServiceSuppressor @Inject constructor(
+    private val appBuildConfig: AppBuildConfig,
+) : SystemAutofillServiceSuppressor {
+
+    @SuppressLint("NewApi")
+    override fun suppressAutofill(webView: WebView?) {
+        if (appBuildConfig.versionCode >= Build.VERSION_CODES.O) {
+            webView?.context?.getSystemService(AutofillManager::class.java)?.cancel()
+        }
+    }
+}

autofill/autofill-impl/src/test/java/com/duckduckgo/autofill/impl/AutofillStoredBackJavascriptInterfaceTest.kt

@@ -42,6 +42,7 @@ import com.duckduckgo.autofill.impl.jsbridge.request.SupportedAutofillInputSubTy
 import com.duckduckgo.autofill.impl.jsbridge.request.SupportedAutofillTriggerType.USER_INITIATED
 import com.duckduckgo.autofill.impl.jsbridge.response.AutofillResponseWriter
 import com.duckduckgo.autofill.impl.sharedcreds.ShareableCredentials
+import com.duckduckgo.autofill.impl.systemautofill.SystemAutofillServiceSuppressor
 import com.duckduckgo.autofill.impl.ui.credential.passwordgeneration.Actions
 import com.duckduckgo.autofill.impl.ui.credential.passwordgeneration.AutogeneratedPasswordEventResolver
 import kotlinx.coroutines.CoroutineScope
@@ -77,6 +78,7 @@ class AutofillStoredBackJavascriptInterfaceTest {
     private val recentInstallChecker: EmailProtectionInContextRecentInstallChecker = mock()
     private val testWebView = WebView(getApplicationContext())
     private val loginDeduplicator: AutofillLoginDeduplicator = NoopDeduplicator()
+    private val systemAutofillServiceSuppressor: SystemAutofillServiceSuppressor = mock()
     private lateinit var testee: AutofillStoredBackJavascriptInterface
 
     private val testCallback = TestCallback()
@@ -102,6 +104,7 @@ class AutofillStoredBackJavascriptInterfaceTest {
             inContextDataStore = inContextDataStore,
             recentInstallChecker = recentInstallChecker,
             loginDeduplicator = loginDeduplicator,
+            systemAutofillServiceSuppressor = systemAutofillServiceSuppressor,
         )
         testee.callback = testCallback
         testee.webView = testWebView