SLCORE-1144 Fix SSF-699

backend/commons/src/main/java/org/sonarsource/sonarlint/core/commons/util/StringUtils.java

@@ -19,13 +19,24 @@
  */
 package org.sonarsource.sonarlint.core.commons.util;
 
+import javax.annotation.Nullable;
+
 public class StringUtils {
 
+  private static final char RTLO = '\u202E';
+
   public static String pluralize(long count, String word) {
-    var pluralizedWord = count == 1 || count == 0 ? word : (word + 's');
+    var pluralizedWord = count == 1 ? word : (word + 's');
     return count + " " + pluralizedWord;
   }
 
+  public static String sanitizeAgainstRTLO(@Nullable String input) {
+    if (input == null) {
+      return null;
+    }
+    return input.replaceAll(String.valueOf(RTLO), "");
+  }
+
   private StringUtils() {
     // utility class
   }

backend/commons/src/test/java/org/sonarsource/sonarlint/core/commons/StringUtilsTests.java

@@ -20,17 +20,28 @@
 package org.sonarsource.sonarlint.core.commons;
 
 import org.junit.jupiter.api.Test;
-import org.sonarsource.sonarlint.core.commons.util.StringUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.sonarsource.sonarlint.core.commons.util.StringUtils.pluralize;
+import static org.sonarsource.sonarlint.core.commons.util.StringUtils.sanitizeAgainstRTLO;
 
 class StringUtilsTests {
 
   @Test
   void should_pluralize_words() {
-    assertThat(StringUtils.pluralize(0, "word")).isEqualTo("0 word");
-    assertThat(StringUtils.pluralize(1, "word")).isEqualTo("1 word");
-    assertThat(StringUtils.pluralize(2, "word")).isEqualTo("2 words");
+    assertThat(pluralize(0, "word")).isEqualTo("0 words");
+    assertThat(pluralize(1, "word")).isEqualTo("1 word");
+    assertThat(pluralize(2, "word")).isEqualTo("2 words");
+  }
+
+  @Test
+  void should_sanitize_against_rtlo() {
+    assertThat(sanitizeAgainstRTLO("This is a \u202eegassem")).isEqualTo("This is a egassem");
+  }
+
+  @Test
+  void should_sanitize_with_null() {
+    assertThat(sanitizeAgainstRTLO(null)).isNull();
   }
 
 }

backend/core/src/main/java/org/sonarsource/sonarlint/core/embedded/server/ShowFixSuggestionRequestHandler.java

@@ -67,6 +67,7 @@
 
 import static org.apache.commons.lang3.StringUtils.isNotBlank;
 import static org.apache.commons.lang3.StringUtils.isNotEmpty;
+import static org.sonarsource.sonarlint.core.commons.util.StringUtils.sanitizeAgainstRTLO;
 
 public class ShowFixSuggestionRequestHandler implements HttpRequestHandler {
 
@@ -333,6 +334,12 @@ public boolean isValid() {
   @VisibleForTesting
   public record ChangesPayload(TextRangePayload beforeLineRange, String before, String after) {
 
+    public ChangesPayload(TextRangePayload beforeLineRange, String before, String after) {
+      this.beforeLineRange = beforeLineRange;
+      this.before = sanitizeAgainstRTLO(before);
+      this.after = sanitizeAgainstRTLO(after);
+    }
+
     public boolean isValid() {
       return beforeLineRange.isValid();
     }