多集群支持，集群切换

src/main/java/com/xuxd/kafka/console/utils/SaslUtil.java

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+package com.xuxd.kafka.console.utils;
+
+import com.xuxd.kafka.console.config.ContextConfigHolder;
+import java.util.Properties;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.apache.kafka.clients.CommonClientConfigs;
+import org.apache.kafka.clients.admin.ScramMechanism;
+import org.apache.kafka.common.config.SaslConfigs;
+import org.apache.kafka.common.security.auth.SecurityProtocol;
+
+/**
+ * kafka-console-ui.
+ *
+ * @author xuxd
+ * @date 2022-01-06 11:07:41
+ **/
+public class SaslUtil {
+
+    public static final Pattern JAAS_PATTERN = Pattern.compile("^.*(username=\"(.*)\"[ \t]+).*$");
+
+    private SaslUtil() {
+    }
+
+    public static String findUsername(String saslJaasConfig) {
+        Matcher matcher = JAAS_PATTERN.matcher(saslJaasConfig);
+        return matcher.find() ? matcher.group(2) : "";
+    }
+
+    public static boolean isEnableSasl() {
+        Properties properties = ContextConfigHolder.CONTEXT_CONFIG.get().getProperties();
+        if (!properties.containsKey(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG)) {
+            return false;
+        }
+        String s = properties.getProperty(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG);
+        SecurityProtocol protocol = SecurityProtocol.valueOf(s);
+        switch (protocol) {
+            case SASL_SSL:
+            case SASL_PLAINTEXT:
+                return true;
+            default:
+                return false;
+        }
+    }
+
+
+    public static boolean isEnableScram() {
+        Properties properties = ContextConfigHolder.CONTEXT_CONFIG.get().getProperties();
+        if (!properties.containsKey(SaslConfigs.SASL_MECHANISM)) {
+            return false;
+        }
+        String s = properties.getProperty(SaslConfigs.SASL_MECHANISM);
+        ScramMechanism mechanism = ScramMechanism.fromMechanismName(s);
+        switch (mechanism) {
+            case UNKNOWN:
+                return false;
+            default:
+                return true;
+        }
+    }
+}