Improve performance of expandIP, and readable

acl/src/main/java/org/apache/rocketmq/acl/common/AclUtils.java

@@ -206,61 +206,31 @@ public class AclUtils {
     }
 
     public static String expandIP(String netaddress, int part) {
-        boolean compress = false;
-        int compressIndex = -1;
-        String[] strArray = StringUtils.split(netaddress, ":");
-        ArrayList<Integer> indexes = new ArrayList<>();
-        for (int i = 0; i < netaddress.length(); i++) {
-            if (netaddress.charAt(i) == ':') {
-                if (indexes.size() > 0 && i - indexes.get(indexes.size() - 1) == 1) {
-                    compressIndex = i;
-                    compress = true;
-                }
-                indexes.add(i);
+        // expand netaddress
+        int separatorCount = StringUtils.countMatches(netaddress, ":");
+        int padCount = part - separatorCount;
+        if(padCount > 0){
+            StringBuilder padStr = new StringBuilder(":");
+            for(int i = 0; i < padCount; i++){
+                padStr.append(":");
             }
+            netaddress = StringUtils.replace(netaddress, "::", padStr.toString());
         }
 
+        // pad netaddress
+        String[] strArray = StringUtils.splitPreserveAllTokens(netaddress, ":");
         for (int i = 0; i < strArray.length; i++) {
-            if (strArray[i].length() < 4) {
-                strArray[i] = "0000".substring(0, 4 - strArray[i].length()) + strArray[i];
+            if(strArray[i].length() < 4){
+                strArray[i] = StringUtils.leftPad(strArray[i], 4, '0');
             }
         }
 
+        // output
         StringBuilder sb = new StringBuilder();
-        if (compress) {
-            int pos = indexes.indexOf(compressIndex);
-            int index = 0;
-            if (!netaddress.startsWith(":")) {
-                for (int i = 0; i < pos; i++) {
-                    sb.append(strArray[index]).append(":");
-                    index += 1;
-                }
-            }
-            int zeroNum = part - strArray.length;
-            if (netaddress.endsWith(":")) {
-                for (int i = 0; i < zeroNum; i++) {
-                    sb.append("0000");
-                    if (i != zeroNum - 1) {
-                        sb.append(":");
-                    }
-                }
-            } else {
-                for (int i = 0; i < zeroNum; i++) {
-                    sb.append("0000").append(":");
-                }
-                for (int i = index; i < strArray.length; i++) {
-                    sb.append(strArray[i]);
-                    if (i != strArray.length - 1) {
-                        sb.append(":");
-                    }
-                }
-            }
-        } else {
-            for (int i = 0; i < strArray.length; i++) {
-                sb.append(strArray[i]);
-                if (i != strArray.length - 1) {
-                    sb.append(":");
-                }
+        for (int i = 0; i < strArray.length; i++) {
+            sb.append(strArray[i]);
+            if (i != strArray.length - 1) {
+                sb.append(":");
             }
         }
         return sb.toString().toUpperCase();

acl/src/test/java/org/apache/rocketmq/acl/common/AclUtilsTest.java

@@ -31,10 +31,12 @@ import org.junit.Test;
 
 public class AclUtilsTest {
 
+    //  strArray[i] = StringUtils.leftPad(strArray[i],4, '0');
+
     @Test
-    public void getAddreeStrArray() {
+    public void getAddresses() {
         String address = "1.1.1.{1,2,3,4}";
-        String[] addressArray = AclUtils.getAddreeStrArray(address, "{1,2,3,4}");
+        String[] addressArray = AclUtils.getAddresses(address, "{1,2,3,4}");
         List<String> newAddressList = new ArrayList<>();
         for (String a : addressArray) {
             newAddressList.add(a);
@@ -49,7 +51,7 @@ public class AclUtilsTest {
 
 //        IPv6 test
         String ipv6Address = "1:ac41:9987::bb22:666:{1,2,3,4}";
-        String[] ipv6AddressArray = AclUtils.getAddreeStrArray(ipv6Address, "{1,2,3,4}");
+        String[] ipv6AddressArray = AclUtils.getAddresses(ipv6Address, "{1,2,3,4}");
         List<String> newIPv6AddressList = new ArrayList<>();
         for (String a : ipv6AddressArray) {
             newIPv6AddressList.add(a);
@@ -181,23 +183,28 @@ public class AclUtilsTest {
     public void v6ipProcessTest() {
         String remoteAddr = "5::7:6:1-200:*";
         String[] strArray = StringUtils.split(remoteAddr, ":");
-        Assert.assertEquals(AclUtils.v6ipProcess(remoteAddr, strArray, 3), "0005:0000:0000:0000:0007:0006");
+        Assert.assertEquals(AclUtils.v6ipProcess(remoteAddr), "0005:0000:0000:0000:0007:0006");
+//        Assert.assertEquals(AclUtils.v6ipProcess(remoteAddr, strArray, 3), "0005:0000:0000:0000:0007:0006");
 
         remoteAddr = "5::7:6:1-200";
         strArray = StringUtils.split(remoteAddr, ":");
-        Assert.assertEquals(AclUtils.v6ipProcess(remoteAddr, strArray, 3), "0005:0000:0000:0000:0000:0007:0006");
+        Assert.assertEquals(AclUtils.v6ipProcess(remoteAddr), "0005:0000:0000:0000:0000:0007:0006");
+//        Assert.assertEquals(AclUtils.v6ipProcess(remoteAddr, strArray, 3), "0005:0000:0000:0000:0000:0007:0006");
 
         remoteAddr = "5::7:6:*";
         strArray = StringUtils.split(remoteAddr, ":");
-        Assert.assertEquals(AclUtils.v6ipProcess(remoteAddr, strArray, 3), "0005:0000:0000:0000:0000:0007:0006");
+        Assert.assertEquals(AclUtils.v6ipProcess(remoteAddr), "0005:0000:0000:0000:0000:0007:0006");
+//        Assert.assertEquals(AclUtils.v6ipProcess(remoteAddr, strArray, 3), "0005:0000:0000:0000:0000:0007:0006");
 
         remoteAddr = "5:7:6:*";
         strArray = StringUtils.split(remoteAddr, ":");
-        Assert.assertEquals(AclUtils.v6ipProcess(remoteAddr, strArray, 3), "0005:0007:0006");
+        Assert.assertEquals(AclUtils.v6ipProcess(remoteAddr), "0005:0007:0006");
+//        Assert.assertEquals(AclUtils.v6ipProcess(remoteAddr, strArray, 3), "0005:0007:0006");
     }
 
     @Test
     public void expandIPTest() {
+        Assert.assertEquals(AclUtils.expandIP("::", 8), "0000:0000:0000:0000:0000:0000:0000:0000");
         Assert.assertEquals(AclUtils.expandIP("::1", 8), "0000:0000:0000:0000:0000:0000:0000:0001");
         Assert.assertEquals(AclUtils.expandIP("3::", 8), "0003:0000:0000:0000:0000:0000:0000:0000");
         Assert.assertEquals(AclUtils.expandIP("2::2", 8), "0002:0000:0000:0000:0000:0000:0000:0002");