HttpServerRequest supports query parameters.

Author: jchenga

reactor-netty-http/src/main/java/reactor/netty/http/server/HttpServerOperations.java

@@ -21,6 +21,7 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.time.ZonedDateTime;
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
@@ -59,6 +60,7 @@
 import io.netty.handler.codec.http.HttpUtil;
 import io.netty.handler.codec.http.HttpVersion;
 import io.netty.handler.codec.http.LastHttpContent;
+import io.netty.handler.codec.http.QueryStringDecoder;
 import io.netty.handler.codec.http.TooLongHttpHeaderException;
 import io.netty.handler.codec.http.TooLongHttpLineException;
 import io.netty.handler.codec.http.cookie.Cookie;
@@ -121,6 +123,7 @@ class HttpServerOperations extends HttpOperations<HttpServerRequest, HttpServerR
 	final String scheme;
 	final ZonedDateTime timestamp;
 
+	Map<String, List<String>> queryParamsMap;
 	BiPredicate<HttpServerRequest, HttpServerResponse> compressionPredicate;
 	Function<? super String, Map<String, String>> paramsResolver;
 	String path;
@@ -459,6 +462,19 @@ public HttpHeaders requestHeaders() {
 		throw new IllegalStateException("request not parsed");
 	}
 
+	@Override
+	public Map<String, List<String>> queryParams() {
+		if (queryParamsMap == null) {
+			queryParamsMap = Collections.unmodifiableMap(parseQueryParams(this.nettyRequest));
+		}
+		return queryParamsMap;
+	}
+
+	private Map<String, List<String>> parseQueryParams(HttpRequest request) {
+		QueryStringDecoder decoder = new QueryStringDecoder(request.uri());
+		return decoder.parameters();
+	}
+
 	@Override
 	public String scheme() {
 		if (connectionInfo != null) {

reactor-netty-http/src/main/java/reactor/netty/http/server/HttpServerRequest.java

@@ -17,6 +17,7 @@
 
 import java.net.InetSocketAddress;
 import java.time.ZonedDateTime;
+import java.util.List;
 import java.util.Map;
 import java.util.function.Consumer;
 import java.util.function.Function;
@@ -143,6 +144,13 @@ default Flux<HttpContent> receiveContent() {
 	 */
 	HttpHeaders requestHeaders();
 
+	/**
+	 * return parsed and decoded query parameter name value pairs
+	 *
+	 * @return query parameters {@link Map&lt;String,List&lt;String&gt;&gt;}
+	 */
+	Map<String, List<String>> queryParams();
+
 	/**
 	 * Returns the inbound protocol and version.
 	 *

reactor-netty-http/src/test/java/reactor/netty/http/server/HttpServerTests.java

@@ -2689,6 +2689,58 @@ void testUseComparatorOrderRoutes() {
 				.verifyComplete();
 	}
 
+	@Test
+	void testRouteQuery() {
+		HttpServerRoutes serverRoutes = HttpServerRoutes.newRoutes()
+				.get("/yes/value",
+						(request, response) -> {
+					StringBuilder sbuf = new StringBuilder();
+					request.queryParams().forEach((key, list) -> {
+
+						for(String value : list) {
+							sbuf.append(key);
+							sbuf.append('=');
+							sbuf.append(value);
+							sbuf.append('&');
+						}
+						sbuf.deleteCharAt(sbuf.length()-1);
+					});
+					return response.sendString(Mono.just("/yes/value?" + sbuf));
+				}).route(r -> true, (req, resp) -> {
+					return resp.sendString(Mono.just("/default"));
+				});
+
+		try {
+			disposableServer = HttpServer
+					.create()
+					.handle(serverRoutes)
+					.bindNow();
+
+			// verify HttpServerRequest has query parameters as the incoming request has query parameters
+			StepVerifier
+					.create(createClient(disposableServer.port())
+							.get()
+							.uri("/yes/value?id=a&id=b")
+							.responseSingle((response, mono) -> mono.asString()))
+					.expectNext("/yes/value?id=a&id=b")
+					.verifyComplete();
+
+			// verify HttpServerRequest does not have query parameters if the http request does not have query
+			// parameters
+			StepVerifier
+					.create(createClient(disposableServer.port())
+							.get()
+							.uri("/yes/value")
+							.responseSingle((response, mono) -> mono.asString()))
+					.expectNext("/yes/value?")
+					.verifyComplete();
+		} finally {
+			if (disposableServer != null) {
+				disposableServer.disposeNow();
+			}
+		}
+	}
+
 	@Test
 	void testOverrideRouteOrder() {
 		HttpServerRoutes serverRoutes = HttpServerRoutes.newRoutes()