fix: eTag comparison

app/src/androidTest/java/com/nextcloud/extensions/StringExtensionTests.kt

@@ -6,7 +6,7 @@
  */
 
 package com.nextcloud.extensions
-import com.nextcloud.utils.extensions.isNotBlankAndEquals
+import com.nextcloud.utils.extensions.eTagChanged
 import junit.framework.TestCase.assertFalse
 import junit.framework.TestCase.assertTrue
 import org.junit.Test
@@ -17,160 +17,160 @@ class StringExtensionTests {
     fun testIsNotBlankAndEqualsWhenGivenBothStringsAreNull() {
         val str1: String? = null
         val str2: String? = null
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenFirstStringIsNull() {
         val str1: String? = null
         val str2 = "hello"
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenSecondStringIsNull() {
         val str1 = "hello"
         val str2: String? = null
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenBothStringsAreEmpty() {
         val str1 = ""
         val str2 = ""
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenFirstStringIsEmpty() {
         val str1 = ""
         val str2 = "hello"
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenSecondStringIsEmpty() {
         val str1 = "hello"
         val str2 = ""
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenBothStringsAreWhitespaceOnly() {
         val str1 = "   "
         val str2 = "  \t  "
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenFirstStringIsWhitespaceOnly() {
         val str1 = "   "
         val str2 = "hello"
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenSecondStringIsWhitespaceOnly() {
         val str1 = "hello"
         val str2 = "   "
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenStringsAreDifferentButBothValid() {
         val str1 = "hello"
         val str2 = "world"
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenStringsHaveDifferentCase() {
         val str1 = "Hello"
         val str2 = "hello"
-        assertTrue(str1.isNotBlankAndEquals(str2))
+        assertFalse(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenMixedCaseStrings() {
         val str1 = "HeLLo WoRLd"
         val str2 = "hello world"
-        assertTrue(str1.isNotBlankAndEquals(str2))
+        assertFalse(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenUppercaseStrings() {
         val str1 = "HELLO"
         val str2 = "hello"
-        assertTrue(str1.isNotBlankAndEquals(str2))
+        assertFalse(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenBothStringsAreIdenticalAndValid() {
         val str1 = "hello"
         val str2 = "hello"
-        assertTrue(str1.isNotBlankAndEquals(str2))
+        assertFalse(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenBothStringsAreIdenticalWithSpaces() {
         val str1 = "hello world"
         val str2 = "hello world"
-        assertTrue(str1.isNotBlankAndEquals(str2))
+        assertFalse(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenBothStringsAreIdenticalSingleCharacter() {
         val str1 = "a"
         val str2 = "A"
-        assertTrue(str1.isNotBlankAndEquals(str2))
+        assertFalse(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenBothStringsAreIdenticalWithSpecialCharacters() {
         val str1 = "hello@world!123"
         val str2 = "HELLO@WORLD!123"
-        assertTrue(str1.isNotBlankAndEquals(str2))
+        assertFalse(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenOneHasLeadingWhitespaceAndOtherDoesNot() {
         val str1 = " hello"
         val str2 = "HELLO"
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenOneHasTrailingWhitespaceAndOtherDoesNot() {
         val str1 = "hello"
         val str2 = "HELLO "
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenBothHaveIdenticalWhitespacePaddingDifferentCase() {
         val str1 = " hello "
         val str2 = " HELLO "
-        assertTrue(str1.isNotBlankAndEquals(str2))
+        assertFalse(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenMixedWhitespaceCharacters() {
         val str1 = "\t"
         val str2 = "\n"
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenOneIsNullAndOtherIsEmpty() {
         val str1: String? = null
         val str2 = ""
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 
     @Test
     fun testIsNotBlankAndEqualsWhenGivenOneIsNullAndOtherIsWhitespace() {
         val str1: String? = null
         val str2 = "   "
-        assertFalse(str1.isNotBlankAndEquals(str2))
+        assertTrue(str1.eTagChanged(str2))
     }
 }

app/src/main/java/com/nextcloud/utils/extensions/StringExtensions.kt

@@ -25,23 +25,15 @@ fun String.removeFileExtension(): String {
     }
 }
 
-/**
- * Checks if two nullable strings are both valid (non-null, non-empty, non-blank) and equal.
- *
- * It returns `true` only when both strings meet all the following criteria:
- * - Neither string is null
- * - Neither string is empty ("")
- * - Neither string contains only whitespace characters (spaces, tabs, newlines, etc.)
- * - Both strings are equal ignoring case differences
- *
- * @param other The other nullable string to compare with this string
- * @return `true` if both strings are valid and equal ignoring case differences, `false` otherwise
- */
-fun String?.isNotBlankAndEquals(other: String?): Boolean = this != null &&
-    other != null &&
-    this.isNotBlank() &&
-    other.isNotBlank() &&
-    this.equals(other, ignoreCase = true)
+@Suppress("ComplexCondition")
+fun String?.eTagChanged(eTagOnServer: String?): Boolean {
+    if (this == null || this.isEmpty() || eTagOnServer == null || eTagOnServer.isEmpty()) {
+        // provided eTags are empty or null can't compare treat as eTag changed
+        return true
+    }
+
+    return !this.equals(eTagOnServer, ignoreCase = true)
+}
 
 fun String.truncateWithEllipsis(limit: Int) = take(limit) + if (length > limit) StringConstants.THREE_DOT else ""
 

app/src/main/java/com/owncloud/android/datamodel/OCFile.java

@@ -796,7 +796,7 @@ public String getEtagOnServer() {
     }
 
     public boolean isEtagChanged() {
-        return !StringExtensionsKt.isNotBlankAndEquals(getEtag(), getEtagOnServer());
+        return StringExtensionsKt.eTagChanged(getEtag(), getEtagOnServer());
     }
 
     public boolean isSharedViaLink() {

app/src/main/java/com/owncloud/android/operations/RefreshFolderOperation.java

@@ -419,7 +419,7 @@ private RemoteOperationResult checkForChanges(OwnCloudClient client) {
                 String remoteFolderETag = remoteFile.getEtag();
                 if (remoteFolderETag != null) {
                     String localFolderEtag = mLocalFolder.getEtag();
-                    mRemoteFolderChanged = !StringExtensionsKt.isNotBlankAndEquals(remoteFolderETag, localFolderEtag);
+                    mRemoteFolderChanged = StringExtensionsKt.eTagChanged(remoteFolderETag, localFolderEtag);
                     Log_OC.d(
                         TAG,
                         "📂 eTag check\n" +