fix: add legacy storage permission check for saving covers

Request WRITE_EXTERNAL_STORAGE permission on Android < Q when saving manga covers or reader images. Added rememberLegacyStoragePermissionState composable to track permission state and show dialog when needed.

Author: leodyversemilla07

app/src/main/java/eu/kanade/presentation/util/Permissions.kt

@@ -1,16 +1,22 @@
 package eu.kanade.presentation.util
 
+import android.Manifest
+import android.content.pm.PackageManager
+import android.os.Build
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.platform.LocalContext
+import androidx.core.content.ContextCompat
 import androidx.lifecycle.DefaultLifecycleObserver
 import androidx.lifecycle.LifecycleOwner
 import androidx.lifecycle.compose.LocalLifecycleOwner
 
+const val LEGACY_STORAGE_PERMISSION = Manifest.permission.WRITE_EXTERNAL_STORAGE
+
 @Composable
 fun rememberRequestPackageInstallsPermissionState(initialValue: Boolean = false): Boolean {
     val context = LocalContext.current
@@ -32,3 +38,26 @@ fun rememberRequestPackageInstallsPermissionState(initialValue: Boolean = false)
 
     return installGranted
 }
+
+@Composable
+fun rememberLegacyStoragePermissionState(initialValue: Boolean = false): Boolean {
+    val context = LocalContext.current
+    val lifecycleOwner = LocalLifecycleOwner.current
+
+    var storageGranted by remember { mutableStateOf(initialValue) }
+
+    DisposableEffect(lifecycleOwner.lifecycle) {
+        val observer = object : DefaultLifecycleObserver {
+            override fun onResume(owner: LifecycleOwner) {
+                storageGranted = Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q ||
+                    ContextCompat.checkSelfPermission(context, LEGACY_STORAGE_PERMISSION) == PackageManager.PERMISSION_GRANTED
+            }
+        }
+        lifecycleOwner.lifecycle.addObserver(observer)
+        onDispose {
+            lifecycleOwner.lifecycle.removeObserver(observer)
+        }
+    }
+
+    return storageGranted
+}

app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaScreen.kt

@@ -39,6 +39,8 @@ import eu.kanade.presentation.manga.components.SetIntervalDialog
 import eu.kanade.presentation.util.AssistContentScreen
 import eu.kanade.presentation.util.Screen
 import eu.kanade.presentation.util.isTabletUi
+import eu.kanade.presentation.util.LEGACY_STORAGE_PERMISSION
+import eu.kanade.presentation.util.rememberLegacyStoragePermissionState
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.isLocalOrStub
 import eu.kanade.tachiyomi.source.online.HttpSource
@@ -62,6 +64,7 @@ import tachiyomi.core.common.util.lang.withIOContext
 import tachiyomi.core.common.util.system.logcat
 import tachiyomi.domain.chapter.model.Chapter
 import tachiyomi.domain.manga.model.Manga
+import tachiyomi.i18n.MR
 import tachiyomi.presentation.core.screens.LoadingScreen
 
 class MangaScreen(
@@ -244,16 +247,31 @@ class MangaScreen(
                 val sm = rememberScreenModel { MangaCoverScreenModel(successState.manga.id) }
                 val manga by sm.state.collectAsState()
                 if (manga != null) {
+                    val hasStoragePermission = rememberLegacyStoragePermissionState()
                     val getContent = rememberLauncherForActivityResult(ActivityResultContracts.GetContent()) {
                         if (it == null) return@rememberLauncherForActivityResult
                         sm.editCover(context, it)
                     }
+                    val requestStoragePermission =
+                        rememberLauncherForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->
+                            if (granted) {
+                                sm.saveCover(context)
+                            } else {
+                                context.toast(MR.strings.missing_storage_permission)
+                            }
+                        }
                     MangaCoverDialog(
                         manga = manga!!,
                         snackbarHostState = sm.snackbarHostState,
                         isCustomCover = remember(manga) { manga!!.hasCustomCover() },
                         onShareClick = { sm.shareCover(context) },
-                        onSaveClick = { sm.saveCover(context) },
+                        onSaveClick = {
+                            if (hasStoragePermission) {
+                                sm.saveCover(context)
+                            } else {
+                                requestStoragePermission.launch(LEGACY_STORAGE_PERMISSION)
+                            }
+                        },
                         onEditClick = {
                             when (it) {
                                 EditCoverAction.EDIT -> getContent.launch("image/*")

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt

@@ -19,7 +19,9 @@ import android.view.View
 import android.view.View.LAYER_TYPE_HARDWARE
 import android.view.WindowManager
 import android.widget.Toast
+import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.enableEdgeToEdge
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.activity.viewModels
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -57,6 +59,8 @@ import eu.kanade.presentation.reader.ReaderPageIndicator
 import eu.kanade.presentation.reader.ReadingModeSelectDialog
 import eu.kanade.presentation.reader.appbars.ReaderAppBars
 import eu.kanade.presentation.reader.settings.ReaderSettingsDialog
+import eu.kanade.presentation.util.LEGACY_STORAGE_PERMISSION
+import eu.kanade.presentation.util.rememberLegacyStoragePermissionState
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.coil.TachiyomiImageDecoder
 import eu.kanade.tachiyomi.data.notification.NotificationReceiver
@@ -256,6 +260,15 @@ class ReaderActivity : BaseActivity() {
                 onChangeOrientation = viewModel::setMangaOrientationType,
             )
         }
+        val hasStoragePermission = rememberLegacyStoragePermissionState()
+        val requestStoragePermission =
+            rememberLauncherForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->
+                if (granted) {
+                    viewModel.saveImage()
+                } else {
+                    toast(MR.strings.missing_storage_permission)
+                }
+            }
 
         Box(modifier = Modifier.fillMaxSize()) {
             if (!state.menuVisible && showPageNumber) {
@@ -325,7 +338,13 @@ class ReaderActivity : BaseActivity() {
                     onDismissRequest = onDismissRequest,
                     onSetAsCover = viewModel::setAsCover,
                     onShare = viewModel::shareImage,
-                    onSave = viewModel::saveImage,
+                    onSave = {
+                        if (hasStoragePermission) {
+                            viewModel.saveImage()
+                        } else {
+                            requestStoragePermission.launch(LEGACY_STORAGE_PERMISSION)
+                        }
+                    },
                 )
             }
             null -> {}