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Fix race condition with fileExists(); this should also be faster

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This commit is contained in:
Philipp Heckel 2022-01-14 13:02:55 -05:00
parent 0fce663975
commit f37ddb80a8
1 changed files with 16 additions and 18 deletions
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34
app/src/main/java/io/heckel/ntfy/util/Util.kt
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@ -7,7 +7,6 @@ import android.net.Uri
import android.provider.OpenableColumns import android.provider.OpenableColumns
import android.view.Window import android.view.Window
import io.heckel.ntfy.data.Notification import io.heckel.ntfy.data.Notification
import io.heckel.ntfy.data.PROGRESS_NONE
import io.heckel.ntfy.data.Subscription import io.heckel.ntfy.data.Subscription
import java.security.SecureRandom import java.security.SecureRandom
import java.text.DateFormat import java.text.DateFormat
@ -112,12 +111,9 @@ fun formatTitle(notification: Notification): String {
} }
// Checks in the most horrible way if a content URI exists; I couldn't find a better way // Checks in the most horrible way if a content URI exists; I couldn't find a better way
fun fileExists(context: Context, uri: String?): Boolean { fun fileExists(context: Context, contentUri: String?): Boolean {
if (uri == null) return false
val resolver = context.applicationContext.contentResolver
return try { return try {
val fileIS = resolver.openInputStream(Uri.parse(uri)) queryFilenameInternal(context, contentUri) // Throws if the file does not exist
fileIS?.close()
true true
} catch (_: Exception) { } catch (_: Exception) {
false false
@ -126,19 +122,21 @@ fun fileExists(context: Context, uri: String?): Boolean {
// Queries the filename of a content URI // Queries the filename of a content URI
fun queryFilename(context: Context, contentUri: String?, fallbackName: String): String { fun queryFilename(context: Context, contentUri: String?, fallbackName: String): String {
if (contentUri == null) { return try {
return fallbackName queryFilenameInternal(context, contentUri)
}
try {
val resolver = context.applicationContext.contentResolver
val cursor = resolver.query(Uri.parse(contentUri), null, null, null, null) ?: return fallbackName
return cursor.use { c ->
val nameIndex = c.getColumnIndexOrThrow(OpenableColumns.DISPLAY_NAME)
c.moveToFirst()
c.getString(nameIndex)
}
} catch (_: Exception) { } catch (_: Exception) {
return fallbackName fallbackName
}
}
fun queryFilenameInternal(context: Context, contentUri: String?): String {
if (contentUri == null) throw Exception("URI is null")
val resolver = context.applicationContext.contentResolver
val cursor = resolver.query(Uri.parse(contentUri), null, null, null, null) ?: throw Exception("Query returned null")
return cursor.use { c ->
val nameIndex = c.getColumnIndexOrThrow(OpenableColumns.DISPLAY_NAME)
c.moveToFirst()
c.getString(nameIndex)
} }
} }