Make PluginTest work for Nextcloud as well

Only issue left was a different maximum file name length for Nextcloud

app/src/androidTest/java/com/stevesoltys/seedvault/PluginTest.kt

@@ -7,6 +7,8 @@ import com.stevesoltys.seedvault.metadata.MetadataManager
 import com.stevesoltys.seedvault.plugins.saf.DocumentsProviderBackupPlugin
 import com.stevesoltys.seedvault.plugins.saf.DocumentsProviderRestorePlugin
 import com.stevesoltys.seedvault.plugins.saf.DocumentsStorage
+import com.stevesoltys.seedvault.plugins.saf.MAX_KEY_LENGTH
+import com.stevesoltys.seedvault.plugins.saf.MAX_KEY_LENGTH_NEXTCLOUD
 import com.stevesoltys.seedvault.plugins.saf.deleteContents
 import com.stevesoltys.seedvault.settings.SettingsManager
 import com.stevesoltys.seedvault.transport.backup.BackupPlugin
@@ -25,9 +27,9 @@ import org.junit.Test
 import org.junit.runner.RunWith
 import org.koin.core.KoinComponent
 import org.koin.core.inject
+import java.io.IOException
 import kotlin.random.Random
 
-
 @RunWith(AndroidJUnit4::class)
 @Suppress("BlockingMethodInNonBlockingContext")
 class PluginTest : KoinComponent {
@@ -162,7 +164,7 @@ class PluginTest : KoinComponent {
         // define key/value pair records
         val record1 = Pair(getRandomBase64(23), getRandomByteArray(1337))
         val record2 = Pair(getRandomBase64(42), getRandomByteArray(42 * 1024))
-        val record3 = Pair(getRandomBase64(255), getRandomByteArray(5 * 1024 * 1024))
+        val record3 = Pair(getRandomBase64(128), getRandomByteArray(5 * 1024 * 1024))
 
         // write first record
         kvBackup.ensureRecordStorageForPackage(packageInfo)
@@ -177,7 +179,10 @@ class PluginTest : KoinComponent {
         var records = kvRestore.listRecords(token, packageInfo)
         assertEquals(1, records.size)
         assertEquals(record1.first, records[0])
-        assertReadEquals(record1.second, kvRestore.getInputStreamForRecord(token, packageInfo, record1.first))
+        assertReadEquals(
+            record1.second,
+            kvRestore.getInputStreamForRecord(token, packageInfo, record1.first)
+        )
 
         // write second and third record
         kvBackup.ensureRecordStorageForPackage(packageInfo)
@@ -187,9 +192,18 @@ class PluginTest : KoinComponent {
         // all records for package are found and returned properly
         records = kvRestore.listRecords(token, packageInfo)
         assertEquals(listOf(record1.first, record2.first, record3.first).sorted(), records.sorted())
-        assertReadEquals(record1.second, kvRestore.getInputStreamForRecord(token, packageInfo, record1.first))
-        assertReadEquals(record2.second, kvRestore.getInputStreamForRecord(token, packageInfo, record2.first))
-        assertReadEquals(record3.second, kvRestore.getInputStreamForRecord(token, packageInfo, record3.first))
+        assertReadEquals(
+            record1.second,
+            kvRestore.getInputStreamForRecord(token, packageInfo, record1.first)
+        )
+        assertReadEquals(
+            record2.second,
+            kvRestore.getInputStreamForRecord(token, packageInfo, record2.first)
+        )
+        assertReadEquals(
+            record3.second,
+            kvRestore.getInputStreamForRecord(token, packageInfo, record3.first)
+        )
 
         // delete record3 and ensure that the other two are still found
         kvBackup.deleteRecord(packageInfo, record3.first)
@@ -211,13 +225,17 @@ class PluginTest : KoinComponent {
         // initialize storage with given token
         initStorage(token)
 
+        // FIXME get Nextcloud to have the same limit
+        val max = if (isNextcloud()) MAX_KEY_LENGTH_NEXTCLOUD else MAX_KEY_LENGTH
+
         // define record with maximum key length and one above the maximum
-        val recordMax = Pair(getRandomBase64(255), getRandomByteArray(1024))
-        val recordOver = Pair(getRandomBase64(256), getRandomByteArray(1024))
+        val recordMax = Pair(getRandomBase64(max), getRandomByteArray(1024))
+        val recordOver = Pair(getRandomBase64(max + 1), getRandomByteArray(1024))
 
         // write max record
         kvBackup.ensureRecordStorageForPackage(packageInfo)
-        kvBackup.getOutputStreamForRecord(packageInfo, recordMax.first).writeAndClose(recordMax.second)
+        kvBackup.getOutputStreamForRecord(packageInfo, recordMax.first)
+            .writeAndClose(recordMax.second)
 
         // max record is found correctly
         assertTrue(kvRestore.hasDataForPackage(token, packageInfo))
@@ -226,8 +244,17 @@ class PluginTest : KoinComponent {
 
         // write exceeding key length record
         kvBackup.ensureRecordStorageForPackage(packageInfo)
+        if (isNextcloud()) {
+            // Nextcloud simply refuses to write long filenames
+            coAssertThrows(IOException::class.java) {
+                kvBackup.getOutputStreamForRecord(packageInfo, recordOver.first)
+                    .writeAndClose(recordOver.second)
+            }
+        } else {
             coAssertThrows(IllegalStateException::class.java) {
-            kvBackup.getOutputStreamForRecord(packageInfo, recordOver.first).writeAndClose(recordOver.second)
+                kvBackup.getOutputStreamForRecord(packageInfo, recordOver.first)
+                    .writeAndClose(recordOver.second)
+            }
         }
     }
 
@@ -278,4 +305,8 @@ class PluginTest : KoinComponent {
         assertTrue(backupPlugin.initializeDevice(newToken = token))
     }
 
+    private fun isNextcloud(): Boolean {
+        return backupPlugin.providerPackageName == "com.nextcloud.client"
+    }
+
 }

app/src/androidTest/java/com/stevesoltys/seedvault/plugins/saf/DocumentsStorageTest.kt

@@ -54,7 +54,7 @@ class DocumentsStorageTest : KoinComponent {
     fun setup() = runBlocking {
         assertNotNull("Select a storage location in the app first!", storage.rootBackupDir)
         file = storage.rootBackupDir?.createOrGetFile(context, filename)
-                ?: throw RuntimeException("Could not create test file")
+            ?: error("Could not create test file")
     }
 
     @After

app/src/main/java/com/stevesoltys/seedvault/plugins/saf/DocumentsProviderKVBackup.kt

@@ -2,12 +2,16 @@ package com.stevesoltys.seedvault.plugins.saf
 
 import android.content.Context
 import android.content.pm.PackageInfo
+import android.util.Log
 import androidx.documentfile.provider.DocumentFile
 import com.stevesoltys.seedvault.transport.backup.DEFAULT_QUOTA_KEY_VALUE_BACKUP
 import com.stevesoltys.seedvault.transport.backup.KVBackupPlugin
 import java.io.IOException
 import java.io.OutputStream
 
+const val MAX_KEY_LENGTH = 255
+const val MAX_KEY_LENGTH_NEXTCLOUD = 228
+
 @Suppress("BlockingMethodInNonBlockingContext")
 internal class DocumentsProviderKVBackup(
     private val storage: DocumentsStorage,
@@ -37,7 +41,8 @@ internal class DocumentsProviderKVBackup(
     override suspend fun removeDataOfPackage(packageInfo: PackageInfo) {
         // we cannot use the cached this.packageFile here,
         // because this can be called before [ensureRecordStorageForPackage]
-        val packageFile = storage.currentKvBackupDir?.findFileBlocking(context, packageInfo.packageName) ?: return
+        val packageFile =
+            storage.currentKvBackupDir?.findFileBlocking(context, packageInfo.packageName) ?: return
         packageFile.delete()
     }
 
@@ -54,6 +59,15 @@ internal class DocumentsProviderKVBackup(
         packageInfo: PackageInfo,
         key: String
     ): OutputStream {
+        check(key.length < MAX_KEY_LENGTH) {
+            "Key $key for ${packageInfo.packageName} is too long: ${key.length} chars."
+        }
+        if (key.length > MAX_KEY_LENGTH_NEXTCLOUD) {
+            Log.e(
+                DocumentsProviderKVBackup::class.simpleName,
+                "Key $key for ${packageInfo.packageName} is too long: ${key.length} chars."
+            )
+        }
         val packageFile = this.packageFile ?: throw AssertionError()
         packageFile.assertRightFile(packageInfo)
         val keyFile = packageFile.createOrGetFile(context, key)