1 files changed, 60 insertions, 0 deletions
diff --git a/zookeeper-client-common/src/main/java/com/yahoo/vespa/zookeeper/client/ZkClientConfigBuilder.java b/zookeeper-client-common/src/main/java/com/yahoo/vespa/zookeeper/client/ZkClientConfigBuilder.java
new file mode 100644
index 00000000000..62191880b8f
--- /dev/null
+++ b/zookeeper-client-common/src/main/java/com/yahoo/vespa/zookeeper/client/ZkClientConfigBuilder.java
@@ -0,0 +1,60 @@
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.vespa.zookeeper.client;
+
+import com.yahoo.security.tls.MixedMode;
+import com.yahoo.security.tls.TlsContext;
+import com.yahoo.security.tls.TransportSecurityUtils;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+/**
+ * Builder for ZK client configuration
+ *
+ * @author bjorncs
+ */
+public class ZkClientConfigBuilder {
+
+    public static final String CLIENT_SECURE_PROPERTY = "zookeeper.client.secure";
+    public static final String SSL_CONTEXT_SUPPLIER_CLASS_PROPERTY = "zookeeper.ssl.context.supplier.class";
+    public static final String SSL_ENABLED_PROTOCOLS_PROPERTY = "zookeeper.ssl.enabledProtocols";
+    public static final String SSL_ENABLED_CIPHERSUITES_PROPERTY = "zookeeper.ssl.ciphersuites";
+    public static final String SSL_CLIENTAUTH_PROPERTY = "zookeeper.ssl.clientAuth";
+
+    private static final TlsContext tlsContext = getTlsContext().orElse(null);
+
+    public ZkClientConfigBuilder() {}
+
+    public String toConfigString() {
+        StringBuilder builder = new StringBuilder();
+        Map<String, String> properties = toConfigProperties();
+        properties.forEach((key, value) -> builder.append(key).append('=').append(value).append('\n'));
+        return builder.toString();
+    }
+
+    public Map<String, String> toConfigProperties() {
+        Map<String, String> builder = new HashMap<>();
+        builder.put(CLIENT_SECURE_PROPERTY, Boolean.toString(tlsContext != null));
+        if (tlsContext != null) {
+            builder.put(SSL_CONTEXT_SUPPLIER_CLASS_PROPERTY, VespaSslContextProvider.class.getName());
+            String protocolsConfigValue = Arrays.stream(tlsContext.parameters().getProtocols()).sorted().collect(Collectors.joining(","));
+            builder.put(SSL_ENABLED_PROTOCOLS_PROPERTY, protocolsConfigValue);
+            String ciphersConfigValue = Arrays.stream(tlsContext.parameters().getCipherSuites()).sorted().collect(Collectors.joining(","));
+            builder.put(SSL_ENABLED_CIPHERSUITES_PROPERTY, ciphersConfigValue);
+            builder.put(SSL_CLIENTAUTH_PROPERTY, "NEED");
+        }
+        return Map.copyOf(builder);
+    }
+
+    private static Optional<TlsContext> getTlsContext() {
+        // TODO(bjorncs) Remove handling of temporary feature flag
+        boolean temporaryFeatureFlag = Optional.ofNullable(System.getenv("VESPA_USE_TLS_FOR_ZOOKEEPER_CLIENT")).map(Boolean::parseBoolean).orElse(false);
+        if (!temporaryFeatureFlag) return Optional.empty();
+
+        if (TransportSecurityUtils.getInsecureMixedMode() == MixedMode.PLAINTEXT_CLIENT_MIXED_SERVER) return Optional.empty();
+        return TransportSecurityUtils.getSystemTlsContext();
+    }
+}