make helper method suspend, use different scope in View

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/ShareHelper.kt

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2024 Vitor Pamplona
+ * Copyright (c) 2025 Vitor Pamplona
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
@@ -25,6 +25,8 @@ import android.net.Uri
 import android.util.Log
 import androidx.core.content.FileProvider
 import com.vitorpamplona.amethyst.Amethyst
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
 import java.io.File
 import java.io.FileInputStream
 import java.io.IOException
@@ -41,25 +43,26 @@ object ShareHelper {
     private val WEBP_HEADER_END = "WEBP".toByteArray()
     private val GIF_MAGIC = "GIF8".toByteArray()
 
-    fun getSharableUriFromUrl(
+    suspend fun getSharableUriFromUrl(
         context: Context,
         imageUrl: String,
-    ): Pair<Uri, String> {
-        // Safely get snapshot and file
-        Amethyst.instance.diskCache.openSnapshot(imageUrl)?.use { snapshot ->
-            val file = snapshot.data.toFile()
+    ): Pair<Uri, String> =
+        withContext(Dispatchers.IO) {
+            // Safely get snapshot and file
+            Amethyst.instance.diskCache.openSnapshot(imageUrl)?.use { snapshot ->
+                val file = snapshot.data.toFile()
 
-            // Determine file extension and prepare sharable file
-            val fileExtension = getImageExtension(file)
-            val fileCopy = prepareSharableFile(context, file, fileExtension)
+                // Determine file extension and prepare sharable file
+                val fileExtension = getImageExtension(file)
+                val fileCopy = prepareSharableFile(context, file, fileExtension)
 
-            // Return sharable uri
-            return Pair(
-                FileProvider.getUriForFile(context, "${context.packageName}.provider", fileCopy),
-                fileExtension,
-            )
-        } ?: throw IOException("Unable to open snapshot for: $imageUrl")
-    }
+                // Return sharable uri
+                return@use Pair(
+                    FileProvider.getUriForFile(context, "${context.packageName}.provider", fileCopy),
+                    fileExtension,
+                )
+            } ?: throw IOException("Unable to open snapshot for: $imageUrl")
+        }
 
     private fun getImageExtension(file: File): String =
         try {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/ZoomableContentView.kt

@@ -49,6 +49,7 @@ import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -104,7 +105,6 @@ import com.vitorpamplona.quartz.nip94FileMetadata.tags.DimensionTag
 import com.vitorpamplona.quartz.utils.sha256.sha256
 import kotlinx.collections.immutable.ImmutableList
 import kotlinx.collections.immutable.persistentListOf
-import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
@@ -716,6 +716,8 @@ fun ShareImageAction(
     onDismiss: () -> Unit,
     content: BaseMediaContent? = null,
 ) {
+    val scope = rememberCoroutineScope()
+
     DropdownMenu(
         expanded = popupExpanded.value,
         onDismissRequest = onDismiss,
@@ -767,7 +769,7 @@ fun ShareImageAction(
                         DropdownMenuItem(
                             text = { Text(stringRes(R.string.share_image)) },
                             onClick = {
-                                shareImageFile(context, videoUri, mimeType)
+                                scope.launch { shareImageFile(context, videoUri, mimeType) }
                                 onDismiss()
                             },
                         )
@@ -778,7 +780,7 @@ fun ShareImageAction(
     }
 }
 
-private fun shareImageFile(
+private suspend fun shareImageFile(
     context: Context,
     videoUri: String,
     mimeType: String?,
@@ -796,13 +798,11 @@ private fun shareImageFile(
             putExtra(Intent.EXTRA_STREAM, uri)
             addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
         }
-    // TODO is this the right scope to avoid leaks?
-    CoroutineScope(Dispatchers.Main).launch {
-        context.startActivity(Intent.createChooser(shareIntent, null))
-    }
+
+    context.startActivity(Intent.createChooser(shareIntent, null))
 }
 
-private suspend fun verifyHash(content: MediaUrlContent): Boolean? {
+private fun verifyHash(content: MediaUrlContent): Boolean? {
     if (content.hash == null) return null
 
     Amethyst.instance.diskCache.openSnapshot(content.url)?.use { snapshot ->