support for external download managers

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/BaseBrowserFragment.kt

@@ -287,6 +287,9 @@ abstract class BaseBrowserFragment : Fragment(), UserInteractionHandler, Activit
                     onNeedToRequestPermissions = { permissions ->
                         requestDownloadPermissionsLauncher.launch(permissions)
                     },
+                    shouldForwardToThirdParties = {
+                        GlobalComponents.useExternalDownloadManager
+                    },
                 ),
                 owner = this,
                 view = view,

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/GlobalComponents.kt

@@ -57,6 +57,9 @@ object GlobalComponents {
     // Engine settings API for managing engine-specific settings
     var engineSettingsApi: GeckoEngineSettingsApiImpl? = null
 
+    // External download manager setting
+    var useExternalDownloadManager: Boolean = false
+
     fun shouldOpenLinksInApp(): Boolean {
         return when (engineSettingsApi!!.getAppLinksMode()) {
             eu.weblibre.flutter_mozilla_components.pigeons.AppLinksMode.ALWAYS -> true

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/api/GeckoEngineSettingsApiImpl.kt

@@ -350,4 +350,12 @@ class GeckoEngineSettingsApiImpl : GeckoEngineSettingsApi {
             else -> AppLinksMode.ASK
         }
     }
+
+    override fun setUseExternalDownloadManager(enabled: Boolean) {
+        GlobalComponents.useExternalDownloadManager = enabled
+    }
+
+    override fun getUseExternalDownloadManager(): Boolean {
+        return GlobalComponents.useExternalDownloadManager
+    }
 }

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/pigeons/Gecko.g.kt

@@ -3850,6 +3850,12 @@ interface GeckoEngineSettingsApi {
    */
   fun setAppLinksMode(mode: AppLinksMode)
   fun getAppLinksMode(): AppLinksMode
+  /**
+   * Sets whether to use external download managers for downloads.
+   * When enabled, downloads are forwarded to third-party apps like ADM, 1DM, AB DM.
+   */
+  fun setUseExternalDownloadManager(enabled: Boolean)
+  fun getUseExternalDownloadManager(): Boolean
 
   companion object {
     /** The codec used by GeckoEngineSettingsApi. */
@@ -3947,6 +3953,39 @@ interface GeckoEngineSettingsApi {
           channel.setMessageHandler(null)
         }
       }
+      run {
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.flutter_mozilla_components.GeckoEngineSettingsApi.setUseExternalDownloadManager$separatedMessageChannelSuffix", codec)
+        if (api != null) {
+          channel.setMessageHandler { message, reply ->
+            val args = message as List<Any?>
+            val enabledArg = args[0] as Boolean
+            val wrapped: List<Any?> = try {
+              api.setUseExternalDownloadManager(enabledArg)
+              listOf(null)
+            } catch (exception: Throwable) {
+              GeckoPigeonUtils.wrapError(exception)
+            }
+            reply.reply(wrapped)
+          }
+        } else {
+          channel.setMessageHandler(null)
+        }
+      }
+      run {
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.flutter_mozilla_components.GeckoEngineSettingsApi.getUseExternalDownloadManager$separatedMessageChannelSuffix", codec)
+        if (api != null) {
+          channel.setMessageHandler { _, reply ->
+            val wrapped: List<Any?> = try {
+              listOf(api.getUseExternalDownloadManager())
+            } catch (exception: Throwable) {
+              GeckoPigeonUtils.wrapError(exception)
+            }
+            reply.reply(wrapped)
+          }
+        } else {
+          channel.setMessageHandler(null)
+        }
+      }
     }
   }
 }