Bug 1796482 - Report save to PDF errors.

app/src/main/java/org/mozilla/fenix/components/Core.kt

@@ -92,6 +92,7 @@ import org.mozilla.fenix.perf.StrictModeManager
 import org.mozilla.fenix.perf.lazyMonitored
 import org.mozilla.fenix.settings.SupportUtils
 import org.mozilla.fenix.settings.advanced.getSelectedLocale
+import org.mozilla.fenix.share.SaveToPDFMiddleware
 import org.mozilla.fenix.telemetry.TelemetryMiddleware
 import org.mozilla.fenix.utils.getUndoDelay
 import org.mozilla.geckoview.GeckoRuntime
@@ -244,6 +245,7 @@ class Core(
                 LastMediaAccessMiddleware(),
                 HistoryMetadataMiddleware(historyMetadataService),
                 SessionPrioritizationMiddleware(),
+                SaveToPDFMiddleware(context),
             )
 
         BrowserStore(

app/src/main/java/org/mozilla/fenix/share/SaveToPDFMiddleware.kt

@@ -0,0 +1,46 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.share
+
+import android.content.Context
+import android.widget.Toast
+import android.widget.Toast.LENGTH_LONG
+import kotlinx.coroutines.DelicateCoroutinesApi
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+import mozilla.components.browser.state.action.BrowserAction
+import mozilla.components.browser.state.action.EngineAction
+import mozilla.components.browser.state.state.BrowserState
+import mozilla.components.lib.state.Action
+import mozilla.components.lib.state.Middleware
+import mozilla.components.lib.state.MiddlewareContext
+import org.mozilla.fenix.R
+
+/**
+ * [BrowserAction] middleware reacting in response to Save to PDF related [Action]s.
+ * @property context An Application context.
+ */
+class SaveToPDFMiddleware(
+    private val context: Context,
+) : Middleware<BrowserState, BrowserAction> {
+
+    @OptIn(DelicateCoroutinesApi::class)
+    override fun invoke(
+        ctx: MiddlewareContext<BrowserState, BrowserAction>,
+        next: (BrowserAction) -> Unit,
+        action: BrowserAction,
+    ) {
+        if (action is EngineAction.SaveToPdfExceptionAction) {
+            // See https://github.com/mozilla-mobile/fenix/issues/27649 for more details,
+            // why a Toast is used here.
+            GlobalScope.launch(Dispatchers.Main) {
+                Toast.makeText(context, R.string.unable_to_save_to_pdf_error, LENGTH_LONG).show()
+            }
+        } else {
+            next(action)
+        }
+    }
+}

app/src/main/res/values/strings.xml

@@ -1028,6 +1028,8 @@
     <string name="share_button_content_description">Share</string>
     <!-- Text for the Save to PDF feature in the share menu -->
     <string name="share_save_to_pdf">Save as PDF</string>
+    <!-- Text for error message when generating a PDF file Text for error message when generating a PDF file. -->
+    <string name="unable_to_save_to_pdf_error">Unable to generate PDF</string>
     <!-- Sub-header in the dialog to share a link to another sync device -->
     <string name="share_device_subheader">Send to device</string>
     <!-- Sub-header in the dialog to share a link to an app from the full list -->