From 02ca8b498ca422b0bdb07980b2d2e4e65a3382e0 Mon Sep 17 00:00:00 2001
From: Fan Lin <linfan.china@gmail.com>
Date: Fri, 16 Sep 2022 05:16:29 +0000
Subject: [PATCH] support regex replacement for sink table naming

---
 .../connect/jdbc/sink/JdbcDbWriter.java       |  4 +-
 .../connect/jdbc/util/NameUtils.java          | 45 +++++++++++++++++++
 .../connect/jdbc/util/NameUtilsTest.java      | 25 +++++++++++
 3 files changed, 73 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/io/confluent/connect/jdbc/util/NameUtils.java
 create mode 100644 src/test/java/io/confluent/connect/jdbc/util/NameUtilsTest.java

diff --git a/src/main/java/io/confluent/connect/jdbc/sink/JdbcDbWriter.java b/src/main/java/io/confluent/connect/jdbc/sink/JdbcDbWriter.java
index 123bc2519..7750ee1a4 100644
--- a/src/main/java/io/confluent/connect/jdbc/sink/JdbcDbWriter.java
+++ b/src/main/java/io/confluent/connect/jdbc/sink/JdbcDbWriter.java
@@ -30,6 +30,8 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import static io.confluent.connect.jdbc.util.NameUtils.toTableName;
+
 public class JdbcDbWriter {
   private static final Logger log = LoggerFactory.getLogger(JdbcDbWriter.class);
 
@@ -97,7 +99,7 @@ void closeQuietly() {
   }
 
   TableId destinationTable(String topic) {
-    final String tableName = config.tableNameFormat.replace("${topic}", topic);
+    final String tableName = toTableName(config.tableNameFormat, topic);
     if (tableName.isEmpty()) {
       throw new ConnectException(String.format(
           "Destination table name for topic '%s' is empty using the format string '%s'",
diff --git a/src/main/java/io/confluent/connect/jdbc/util/NameUtils.java b/src/main/java/io/confluent/connect/jdbc/util/NameUtils.java
new file mode 100644
index 000000000..890848f68
--- /dev/null
+++ b/src/main/java/io/confluent/connect/jdbc/util/NameUtils.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2018 Confluent Inc.
+ *
+ * Licensed under the Confluent Community License (the "License"); you may not use
+ * this file except in compliance with the License.  You may obtain a copy of the
+ * License at
+ *
+ * http://www.confluent.io/confluent-community-license
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OF ANY KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package io.confluent.connect.jdbc.util;
+
+public class NameUtils {
+
+  private static final String TOPIC_PREFIX = "${topic";
+  private static final String TOPIC_POSTFIX = "}";
+
+  public static String toTableName(String rawName, String topic) {
+    int topicStartPos = rawName.indexOf(TOPIC_PREFIX);
+    int topicEndPos = rawName.lastIndexOf(TOPIC_POSTFIX);
+    if (topicStartPos >= 0) {
+      if (topicEndPos == topicStartPos + TOPIC_PREFIX.length()) {
+        return rawName.replace(TOPIC_PREFIX + TOPIC_POSTFIX, topic);
+      } else if (topicEndPos > topicStartPos + TOPIC_PREFIX.length()) {
+        int subStartPos = topicStartPos + TOPIC_PREFIX.length() + 1;
+        String splitter = rawName.substring(subStartPos - 1, subStartPos);
+        int subMidPos = rawName.indexOf(splitter, subStartPos);
+        int subEndPos = rawName.indexOf(splitter, subMidPos + 1);
+        if (subMidPos > 0 && subEndPos > 0) {
+          return rawName.substring(0, topicStartPos)
+            + topic.replaceAll(rawName.substring(subStartPos, subMidPos),
+                            rawName.substring(subMidPos + 1, subEndPos))
+            + rawName.substring(topicEndPos + 1);
+        }
+      }
+    }
+    return rawName;
+  }
+
+}
diff --git a/src/test/java/io/confluent/connect/jdbc/util/NameUtilsTest.java b/src/test/java/io/confluent/connect/jdbc/util/NameUtilsTest.java
new file mode 100644
index 000000000..658f41547
--- /dev/null
+++ b/src/test/java/io/confluent/connect/jdbc/util/NameUtilsTest.java
@@ -0,0 +1,25 @@
+package io.confluent.connect.jdbc.util;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class NameUtilsTest {
+
+  @Test
+  public void testToTableName() {
+    // No replacement
+    assertEquals("kafka_connect",
+            NameUtils.toTableName("kafka_connect", "anything"));
+    // Replace topic name
+    assertEquals("kafka_connect",
+            NameUtils.toTableName("${topic}", "kafka_connect"));
+    assertEquals("pre_kafka_connect_post",
+            NameUtils.toTableName("pre_${topic}_post", "kafka_connect"));
+    // Replace topic name with regex
+    assertEquals("pre_kafka_connect_post",
+            NameUtils.toTableName("${topic/^.+\\.ao_/pre_/}_post", "io.confluent.connect.jdbc.ao_kafka_connect"));
+    assertEquals("pre_kafka_connect_post",
+            NameUtils.toTableName("pre_${topic#^.+\\.ao_##}_post", "io.confluent.connect.jdbc.ao_kafka_connect"));
+  }
+}