add ipv6 port support

Author: keshavdandeva

java-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryJdbcUrlUtility.java

@@ -898,6 +898,22 @@ private static void parseAuthority(String urlPart, Map<String, String> map) {
       return;
     }
 
+    if (authority.startsWith("[")) {
+      int closingBracketIndex = authority.indexOf(']');
+      if (closingBracketIndex != -1) {
+        String host = authority.substring(0, closingBracketIndex + 1).trim();
+        String rest = authority.substring(closingBracketIndex + 1).trim();
+        map.put(PROXY_HOST_PROPERTY_NAME, host);
+        if (rest.startsWith(":")) {
+          String port = rest.substring(1).trim();
+          if (!port.isEmpty()) {
+            map.put(PROXY_PORT_PROPERTY_NAME, port);
+          }
+        }
+        return;
+      }
+    }
+
     int colonIndex = authority.indexOf(':');
     if (colonIndex == -1) {
       map.put(PROXY_HOST_PROPERTY_NAME, authority);

java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/BigQueryJdbcUrlUtilityTest.java

@@ -305,4 +305,22 @@ public void testDataSourceFromUrlAuthorityProxy() {
     assertThat(ds.getProxyHost()).isEqualTo("proxy.example.com");
     assertThat(ds.getProxyPort()).isEqualTo("8080");
   }
+
+  @Test
+  public void testParseAuthorityProxyIpv6() {
+    String url = "jdbc:bigquery://[::1]:8080;ProjectId=MyProject";
+    String proxyHost = BigQueryJdbcUrlUtility.parseUriProperty(url, "ProxyHost");
+    String proxyPort = BigQueryJdbcUrlUtility.parseUriProperty(url, "ProxyPort");
+    assertThat(proxyHost).isEqualTo("[::1]");
+    assertThat(proxyPort).isEqualTo("8080");
+  }
+
+  @Test
+  public void testParseAuthorityProxyIpv6NoPort() {
+    String url = "jdbc:bigquery://[::1];ProjectId=MyProject";
+    String proxyHost = BigQueryJdbcUrlUtility.parseUriProperty(url, "ProxyHost");
+    String proxyPort = BigQueryJdbcUrlUtility.parseUriProperty(url, "ProxyPort");
+    assertThat(proxyHost).isEqualTo("[::1]");
+    assertThat(proxyPort).isNull();
+  }
 }