Add auto rename object and tests

Signed-off-by: alperozturk <alper_ozturk@proton.me>

app/src/androidTest/java/com/nextcloud/utils/AutoRenameTests.kt

@@ -0,0 +1,49 @@
+/*
+ * Nextcloud - Android Client
+ *
+ * SPDX-FileCopyrightText: 2024 Alper Ozturk <alper.ozturk@nextcloud.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package com.nextcloud.utils
+
+import com.nextcloud.utils.autoRename.AutoRename
+import com.nextcloud.utils.extensions.forbiddenFilenameCharacters
+import com.nextcloud.utils.extensions.forbiddenFilenameExtension
+import com.owncloud.android.AbstractOnServerIT
+import com.owncloud.android.lib.resources.status.OCCapability
+import org.junit.Before
+import org.junit.Test
+
+class AutoRenameTests: AbstractOnServerIT() {
+
+    private var capability: OCCapability = fileDataStorageManager.getCapability(account.name)
+
+    @Before
+    fun setup() {
+        capability = capability.apply {
+            forbiddenFilenameExtensionJson = """[" ",".",".part",".part"]"""
+            forbiddenFilenameCharactersJson = """["<", ">", ":", "\\\\", "/", "|", "?", "*", "&"]"""
+        }
+    }
+
+    @Test
+    fun testRenameWhenInvalidCharacterIncludedShouldReturnValidFilename() {
+        val forbiddenFilenameCharacters = capability.forbiddenFilenameCharacters()
+        val randomInvalidChar = forbiddenFilenameCharacters.random()
+        val filename = "file${randomInvalidChar}file.txt"
+        val result = AutoRename.rename(filename, capability)
+        val expectedFilename = "file_file.txt"
+        assert(result == expectedFilename)
+    }
+
+    @Test
+    fun testRenameWhenInvalidFilenameExtensionIncludedShouldReturnValidFilename() {
+        val forbiddenFilenameExtension = capability.forbiddenFilenameExtension()
+        val randomInvalidFilenameExtension = forbiddenFilenameExtension.random()
+        val filename = "file${randomInvalidFilenameExtension}"
+        val result = AutoRename.rename(filename, capability)
+        val expectedFilename = "file_"
+        assert(result == expectedFilename)
+    }
+}

app/src/main/java/com/nextcloud/utils/autoRename/AutoRename.kt

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+/*
+ * Nextcloud - Android Client
+ *
+ * SPDX-FileCopyrightText: 2024 Alper Ozturk <alper.ozturk@nextcloud.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package com.nextcloud.utils.autoRename
+
+import com.nextcloud.utils.extensions.forbiddenFilenameCharacters
+import com.nextcloud.utils.extensions.forbiddenFilenameExtension
+import com.owncloud.android.lib.resources.status.OCCapability
+
+object AutoRename {
+    private const val REPLACEMENT = "_"
+
+    fun rename(filename: String, capability: OCCapability): String {
+        val result = filename.lowercase()
+
+        capability.run {
+            forbiddenFilenameCharactersJson?.let {
+                val forbiddenFilenameCharacters = capability.forbiddenFilenameCharacters()
+
+                forbiddenFilenameCharacters.forEach {
+                    if (result.contains(it)) {
+                        return result.replace(it, REPLACEMENT)
+                    }
+                }
+            }
+
+            forbiddenFilenameExtensionJson?.let {
+                for (forbiddenExtension in forbiddenFilenameExtension()) {
+                    if (filename.endsWith(forbiddenExtension, ignoreCase = true) ||
+                        filename.startsWith(forbiddenExtension, ignoreCase = true)) {
+                        return filename.replace(forbiddenExtension, REPLACEMENT)
+                    }
+                }
+            }
+        }
+
+        return result
+    }
+}