Fix isOriginForm and isAsteriskForm (netty#12568)

Motivation:

These methods would always return false using the previously implementation (URI#getSchemeSpecificPart is [documented](https://docs.oracle.com/javase/8/docs/api/java/net/URI.html#getSchemeSpecificPart--) to *never* return `null`). They also had other implementation errors.

Modification:

Edit methods to conform with RFC 7230.

Result:

Methods handle the basic examples provided in RFC 7230. More test cases can be added as needed.

codec-http/src/main/java/io/netty/handler/codec/http/HttpUtil.java

@@ -49,19 +49,31 @@ private HttpUtil() { }
      * <a href="https://tools.ietf.org/html/rfc7230#section-5.3">rfc7230, 5.3</a>.
      */
     public static boolean isOriginForm(URI uri) {
-        return uri.getScheme() == null && uri.getSchemeSpecificPart() == null &&
-               uri.getHost() == null && uri.getAuthority() == null;
+        return isOriginForm(uri.toString());
+    }
+
+    /**
+     * Determine if a string uri is in origin-form according to
+     * <a href="https://tools.ietf.org/html/rfc7230#section-5.3">rfc7230, 5.3</a>.
+     */
+    public static boolean isOriginForm(String uri) {
+        return uri.startsWith("/");
     }
 
     /**
      * Determine if a uri is in asterisk-form according to
      * <a href="https://tools.ietf.org/html/rfc7230#section-5.3">rfc7230, 5.3</a>.
      */
     public static boolean isAsteriskForm(URI uri) {
-        return "*".equals(uri.getPath()) &&
-                uri.getScheme() == null && uri.getSchemeSpecificPart() == null &&
-                uri.getHost() == null && uri.getAuthority() == null && uri.getQuery() == null &&
-                uri.getFragment() == null;
+        return isAsteriskForm(uri.toString());
+    }
+
+    /**
+     * Determine if a string uri is in asterisk-form according to
+     * <a href="https://tools.ietf.org/html/rfc7230#section-5.3">rfc7230, 5.3</a>.
+     */
+    public static boolean isAsteriskForm(String uri) {
+        return "*".equals(uri);
     }
 
     /**

codec-http/src/test/java/io/netty/handler/codec/http/HttpUtilTest.java

@@ -22,6 +22,7 @@
 
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
+import java.net.URI;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
@@ -38,6 +39,29 @@
 
 public class HttpUtilTest {
 
+    @Test
+    public void testRecognizesOriginForm() {
+        // Origin form: https://tools.ietf.org/html/rfc7230#section-5.3.1
+        assertTrue(HttpUtil.isOriginForm(URI.create("/where?q=now")));
+        // Absolute form: https://tools.ietf.org/html/rfc7230#section-5.3.2
+        assertFalse(HttpUtil.isOriginForm(URI.create("https://www.example.org/pub/WWW/TheProject.html")));
+        // Authority form: https://tools.ietf.org/html/rfc7230#section-5.3.3
+        assertFalse(HttpUtil.isOriginForm(URI.create("www.example.com:80")));
+        // Asterisk form: https://tools.ietf.org/html/rfc7230#section-5.3.4
+        assertFalse(HttpUtil.isOriginForm(URI.create("*")));
+    }
+
+    @Test public void testRecognizesAsteriskForm() {
+        // Asterisk form: https://tools.ietf.org/html/rfc7230#section-5.3.4
+        assertTrue(HttpUtil.isAsteriskForm(URI.create("*")));
+        // Origin form: https://tools.ietf.org/html/rfc7230#section-5.3.1
+        assertFalse(HttpUtil.isAsteriskForm(URI.create("/where?q=now")));
+        // Absolute form: https://tools.ietf.org/html/rfc7230#section-5.3.2
+        assertFalse(HttpUtil.isAsteriskForm(URI.create("https://www.example.org/pub/WWW/TheProject.html")));
+        // Authority form: https://tools.ietf.org/html/rfc7230#section-5.3.3
+        assertFalse(HttpUtil.isAsteriskForm(URI.create("www.example.com:80")));
+    }
+
     @Test
     public void testRemoveTransferEncodingIgnoreCase() {
         HttpMessage message = new DefaultHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK);

codec-http2/src/main/java/io/netty/handler/codec/http2/HttpConversionUtil.java

@@ -49,6 +49,8 @@
 import static io.netty.handler.codec.http.HttpResponseStatus.parseLine;
 import static io.netty.handler.codec.http.HttpScheme.HTTP;
 import static io.netty.handler.codec.http.HttpScheme.HTTPS;
+import static io.netty.handler.codec.http.HttpUtil.isAsteriskForm;
+import static io.netty.handler.codec.http.HttpUtil.isOriginForm;
 import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
 import static io.netty.handler.codec.http2.Http2Exception.connectionError;
 import static io.netty.handler.codec.http2.Http2Exception.streamError;
@@ -434,8 +436,7 @@ public static Http2Headers toHttp2Headers(HttpMessage in, boolean validateHeader
         if (in instanceof HttpRequest) {
             HttpRequest request = (HttpRequest) in;
             String host = inHeaders.getAsString(HttpHeaderNames.HOST);
-            if (request.uri().startsWith("/") || "*".equals(request.uri())) {
-                // Origin or asterisk form
+            if (isOriginForm(request.uri()) || isAsteriskForm(request.uri())) {
                 out.path(new AsciiString(request.uri()));
                 setHttp2Scheme(inHeaders, out);
             } else {