SONARPY-2413 Clean-up the csrf_except decorator check

Author: Seppli11

python-checks/src/main/java/org/sonar/python/checks/hotspots/CsrfDisabledCheck.java

@@ -20,13 +20,10 @@
 import java.util.Arrays;
 import java.util.HashSet;
 import java.util.List;
-import java.util.Locale;
-import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.function.Predicate;
 import java.util.regex.Pattern;
-import java.util.stream.Stream;
 import org.sonar.check.Rule;
 import org.sonar.plugins.python.api.PythonSubscriptionCheck;
 import org.sonar.plugins.python.api.SubscriptionContext;
@@ -117,19 +114,14 @@ private static Predicate<Expression> isListAnyMatch(Predicate<Expression> pred)
     "django.views.decorators.csrf.csrf_exempt",
     "flask_wtf.csrf.CSRFProtect.exempt"));
 
+  private static boolean isDangerousDecorator(Decorator expression) {
+    return DANGEROUS_DECORATORS.stream().anyMatch(dangerousFqn -> TreeUtils.isDecoratorWithFQN(expression, dangerousFqn));
+  }
+
   /** Raises issue whenever a decorator with something about "CSRF" and "exempt" in the combined name is found. */
   private static void decoratorCsrfExemptCheck(SubscriptionContext subscriptionContext) {
     Decorator decorator = (Decorator) subscriptionContext.syntaxNode();
-    List<String> names = Stream.of(TreeUtils.decoratorNameFromExpression(decorator.expression()))
-      .filter(Objects::nonNull)
-      .flatMap(s -> Arrays.stream(s.split("\\.")))
-      .toList();
-    // This is a temporary workaround until symbol resolution works for decorators.
-    // Use the actual functions with FQNs from DANGEROUS_DECORATORS once that's fixed.
-    // Related ticket: https://jira.sonarsource.com/browse/SONARPY-681
-    boolean isDangerous = names.stream().anyMatch(s -> s.toLowerCase(Locale.US).contains("csrf")) &&
-      names.stream().anyMatch(s -> s.toLowerCase(Locale.US).contains("exempt"));
-    if (isDangerous) {
+    if(isDangerousDecorator(decorator)) {
       subscriptionContext.addIssue(decorator.lastToken(), MESSAGE);
     }
   }