Feature/craig/check for downloadmanager before downloading

app/src/main/java/com/duckduckgo/app/browser/BrowserTabFragment.kt

@@ -29,6 +29,7 @@ import android.content.res.Configuration
 import android.media.MediaScannerConnection
 import android.net.Uri
 import android.os.*
+import android.provider.Settings
 import android.text.Editable
 import android.view.*
 import android.view.View.*
@@ -63,6 +64,7 @@ import com.duckduckgo.app.brokensite.BrokenSiteActivity
 import com.duckduckgo.app.brokensite.BrokenSiteData
 import com.duckduckgo.app.browser.BrowserTabViewModel.*
 import com.duckduckgo.app.browser.autocomplete.BrowserAutoCompleteSuggestionsAdapter
+import com.duckduckgo.app.browser.downloader.DownloadFailReason
 import com.duckduckgo.app.browser.downloader.FileDownloadNotificationManager
 import com.duckduckgo.app.browser.downloader.FileDownloader
 import com.duckduckgo.app.browser.downloader.FileDownloader.FileDownloadListener
@@ -1112,9 +1114,30 @@ class BrowserTabFragment : Fragment(), FindListener, CoroutineScope, DaxDialogLi
                 }
             }
 
-            override fun downloadFailed(message: String) {
+            override fun downloadFailed(message: String, downloadFailReason: DownloadFailReason) {
                 Timber.w("Failed to download file [$message]")
+
                 fileDownloadNotificationManager.showDownloadFailedNotification()
+
+                val snackbar = Snackbar.make(toolbar, R.string.downloadFailed, Snackbar.LENGTH_INDEFINITE)
+                if (downloadFailReason == DownloadFailReason.DownloadManagerDisabled) {
+                    snackbar.setText(message)
+                    snackbar.setAction(getString(R.string.enable)) {
+                        showDownloadManagerAppSettings()
+                    }
+                }
+                snackbar.show()
+            }
+
+            private fun showDownloadManagerAppSettings() {
+                try {
+                    val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
+                    intent.data = DownloadFailReason.DOWNLOAD_MANAGER_SETTINGS_URI
+                    startActivity(intent)
+                } catch (e: ActivityNotFoundException) {
+                    Timber.w(e, "Could not open DownloadManager settings")
+                    Snackbar.make(toolbar, R.string.downloadManagerIncompatible, Snackbar.LENGTH_INDEFINITE).show()
+                }
             }
         }
     }

app/src/main/java/com/duckduckgo/app/browser/downloader/DataUriDownloader.kt

@@ -38,7 +38,7 @@ class DataUriDownloader @Inject constructor(
             when (val parsedDataUri = dataUriParser.generate(pending.url)) {
                 is ParseResult.Invalid -> {
                     Timber.w("Failed to extract data from data URI")
-                    callback?.downloadFailed("Failed to extract data from data URI")
+                    callback?.downloadFailed("Failed to extract data from data URI", DownloadFailReason.DataUriParseException)
                     return
                 }
                 is ParseResult.ParsedDataUri -> {
@@ -50,7 +50,7 @@ class DataUriDownloader @Inject constructor(
             }
         } catch (e: IOException) {
             Timber.e(e, "Failed to save data uri")
-            callback?.downloadFailed("Failed to download data uri")
+            callback?.downloadFailed("Failed to download data uri", DownloadFailReason.DataUriParseException)
         }
     }
 

app/src/main/java/com/duckduckgo/app/browser/downloader/FileDownloadNotificationManager.kt

@@ -70,7 +70,6 @@ class FileDownloadNotificationManager @Inject constructor(
 
     fun showDownloadFailedNotification() {
         applicationContext.runOnUiThread {
-            applicationContext.longToast(getString(R.string.downloadFailed))
 
             val notification = NotificationCompat.Builder(applicationContext, ChannelType.FILE_DOWNLOADED.id)
                 .setContentTitle(applicationContext.getString(R.string.downloadFailed))

app/src/main/java/com/duckduckgo/app/browser/downloader/FileDownloader.kt

@@ -16,6 +16,7 @@
 
 package com.duckduckgo.app.browser.downloader
 
+import android.net.Uri
 import android.os.Environment
 import android.webkit.URLUtil
 import androidx.annotation.WorkerThread
@@ -32,9 +33,9 @@ class FileDownloader @Inject constructor(
     @WorkerThread
     fun download(pending: PendingFileDownload, callback: FileDownloadListener) {
         when {
-            pending.isNetworkUrl -> networkFileDownloader.download(pending)
+            pending.isNetworkUrl -> networkFileDownloader.download(pending, callback)
             pending.isDataUrl -> dataUriDownloader.download(pending, callback)
-            else -> callback.downloadFailed("Not supported")
+            else -> callback.downloadFailed("Not supported", DownloadFailReason.UnsupportedUrlType)
         }
     }
 
@@ -50,7 +51,7 @@ class FileDownloader @Inject constructor(
     interface FileDownloadListener {
         fun downloadStarted()
         fun downloadFinished(file: File, mimeType: String?)
-        fun downloadFailed(message: String)
+        fun downloadFailed(message: String, downloadFailReason: DownloadFailReason)
     }
 }
 
@@ -63,3 +64,15 @@ fun FileDownloader.PendingFileDownload.guessFileName(): String {
 val FileDownloader.PendingFileDownload.isDataUrl get() = URLUtil.isDataUrl(url)
 
 val FileDownloader.PendingFileDownload.isNetworkUrl get() = URLUtil.isNetworkUrl(url)
+
+sealed class DownloadFailReason {
+
+    object DownloadManagerDisabled : DownloadFailReason()
+    object UnsupportedUrlType : DownloadFailReason()
+    object Other : DownloadFailReason()
+    object DataUriParseException : DownloadFailReason()
+
+    companion object {
+        val DOWNLOAD_MANAGER_SETTINGS_URI: Uri = Uri.parse("package:com.android.providers.downloads")
+    }
+}

app/src/main/java/com/duckduckgo/app/browser/downloader/NetworkFileDownloader.kt

@@ -18,14 +18,22 @@ package com.duckduckgo.app.browser.downloader
 
 import android.app.DownloadManager
 import android.content.Context
+import android.content.pm.PackageManager.*
 import android.webkit.CookieManager
 import androidx.core.net.toUri
+import com.duckduckgo.app.browser.R
 import com.duckduckgo.app.browser.downloader.FileDownloader.PendingFileDownload
 import javax.inject.Inject
 
 class NetworkFileDownloader @Inject constructor(private val context: Context) {
 
-    fun download(pendingDownload: PendingFileDownload) {
+    fun download(pendingDownload: PendingFileDownload, callback: FileDownloader.FileDownloadListener) {
+
+        if (!downloadManagerAvailable()) {
+            callback.downloadFailed(context.getString(R.string.downloadManagerDisabled), DownloadFailReason.DownloadManagerDisabled)
+            return
+        }
+
         val guessedFileName = pendingDownload.guessFileName()
 
         val request = DownloadManager.Request(pendingDownload.url.toUri()).apply {
@@ -39,4 +47,17 @@ class NetworkFileDownloader @Inject constructor(private val context: Context) {
         val manager = context.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager?
         manager?.enqueue(request)
     }
+
+    private fun downloadManagerAvailable(): Boolean {
+        return when (context.packageManager.getApplicationEnabledSetting(DOWNLOAD_MANAGER_PACKAGE)) {
+            COMPONENT_ENABLED_STATE_DISABLED -> false
+            COMPONENT_ENABLED_STATE_DISABLED_USER -> false
+            COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED -> false
+            else -> true
+        }
+    }
+
+    companion object {
+        private const val DOWNLOAD_MANAGER_PACKAGE = "com.android.providers.downloads"
+    }
 }

app/src/main/res/values/string-untranslated.xml

@@ -69,4 +69,10 @@
     <string name="fireproofWebsiteEmptyListHint">No websites fireproofed yet</string>
     <string name="fireproofWebsiteFeatureDescription">Websites rely on cookies to keep you signed in. When you Fireproof a site, cookies won\'t be erased and you\'ll stay signed in, even after using the Fire Button.</string>
     <string name="fireproofWebsiteOverflowContentDescription">More options for fireproof website %s</string>
+
+    <!-- Download Manager problems -->
+    <string name="downloadManagerDisabled">Download Manager is disabled</string>
+    <string name="downloadManagerIncompatible">Download Manager not available on this device</string>
+    <string name="enable">Enable</string>
+
 </resources>