[GR-36601] Make ResourceURLConnection module aware.

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/Resources.java

@@ -29,8 +29,6 @@
 import java.io.InputStream;
 import java.net.MalformedURLException;
 import java.net.URL;
-import java.net.URLConnection;
-import java.net.URLStreamHandler;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -47,7 +45,6 @@
 import com.oracle.svm.core.annotate.AutomaticFeature;
 import com.oracle.svm.core.jdk.resources.NativeImageResourcePath;
 import com.oracle.svm.core.jdk.resources.ResourceStorageEntry;
-import com.oracle.svm.core.jdk.resources.ResourceURLConnection;
 import com.oracle.svm.core.util.ImageHeapMap;
 import com.oracle.svm.core.util.VMError;
 
@@ -81,29 +78,11 @@ public EconomicMap<Pair<String, String>, ResourceStorageEntry> resources() {
     }
 
     public static byte[] inputStreamToByteArray(InputStream is) {
-        // TODO: Replace this with is.readAllBytes() once Java 8 support is removed
-        byte[] arr = new byte[4096];
-        int pos = 0;
         try {
-            for (;;) {
-                if (pos == arr.length) {
-                    byte[] tmp = new byte[arr.length * 2];
-                    System.arraycopy(arr, 0, tmp, 0, arr.length);
-                    arr = tmp;
-                }
-                int len = is.read(arr, pos, arr.length - pos);
-                if (len == -1) {
-                    break;
-                }
-                pos += len;
-            }
+            return is.readAllBytes();
         } catch (IOException ex) {
             throw VMError.shouldNotReachHere(ex);
         }
-
-        byte[] data = new byte[pos];
-        System.arraycopy(arr, 0, data, 0, pos);
-        return data;
     }
 
     private static void addEntry(String moduleName, String resourceName, boolean isDirectory, byte[] data) {
@@ -159,19 +138,13 @@ public static ResourceStorageEntry get(String moduleName, String resourceName) {
         return singleton().resources.get(Pair.create(moduleName, resourceName));
     }
 
-    private static URL createURL(String resourceName, int index) {
+    private static URL createURL(String moduleName, String resourceName, int index) {
         try {
-            return new URL(JavaNetSubstitutions.RESOURCE_PROTOCOL, null, -1, resourceName,
-                            new URLStreamHandler() {
-                                @Override
-                                protected URLConnection openConnection(URL url) {
-                                    return new ResourceURLConnection(url, index);
-                                }
-                            });
+            String refPart = index != 0 ? '#' + Integer.toString(index) : "";
+            return new URL(JavaNetSubstitutions.RESOURCE_PROTOCOL, moduleName, -1, '/' + resourceName + refPart);
         } catch (MalformedURLException ex) {
             throw new IllegalStateException(ex);
         }
-
     }
 
     public static URL createURL(String resourceName) {
@@ -213,18 +186,34 @@ public static Enumeration<URL> createURLs(String moduleName, String resourceName
         if (resourceName == null) {
             return null;
         }
-
         String canonicalResourceName = toCanonicalForm(resourceName);
-        ResourceStorageEntry entry = Resources.get(moduleName, canonicalResourceName);
-        if (entry == null) {
+
+        List<URL> resourcesURLs = new ArrayList<>();
+
+        /* If moduleName was unspecified we have to consider all modules in the image */
+        if (moduleName == null) {
+            for (Module module : BootModuleLayerSupport.instance().getBootLayer().modules()) {
+                ResourceStorageEntry entry = Resources.get(module.getName(), canonicalResourceName);
+                addURLEntries(resourcesURLs, entry, module.getName(), canonicalResourceName);
+            }
+        }
+        ResourceStorageEntry explicitEntry = Resources.get(moduleName, canonicalResourceName);
+        addURLEntries(resourcesURLs, explicitEntry, moduleName, canonicalResourceName);
+
+        if (resourcesURLs.isEmpty()) {
             return Collections.emptyEnumeration();
         }
+        return Collections.enumeration(resourcesURLs);
+    }
+
+    private static void addURLEntries(List<URL> resourcesURLs, ResourceStorageEntry entry, String moduleName, String canonicalResourceName) {
+        if (entry == null) {
+            return;
+        }
         int numberOfResources = entry.getData().size();
-        List<URL> resourcesURLs = new ArrayList<>(numberOfResources);
         for (int index = 0; index < numberOfResources; index++) {
-            resourcesURLs.add(createURL(canonicalResourceName, index));
+            resourcesURLs.add(createURL(moduleName, canonicalResourceName, index));
         }
-        return Collections.enumeration(resourcesURLs);
     }
 }
 

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/resources/ResourceURLConnection.java

@@ -33,26 +33,15 @@
 import java.net.URLConnection;
 import java.util.List;
 
+import com.oracle.svm.core.jdk.JavaNetSubstitutions;
 import com.oracle.svm.core.jdk.Resources;
 
 public class ResourceURLConnection extends URLConnection {
 
-    private final URL url;
-    private final int index;
     private byte[] data;
 
     public ResourceURLConnection(URL url) {
-        this(url, 0);
-    }
-
-    public ResourceURLConnection(URL url, int index) {
         super(url);
-        this.url = url;
-        this.index = index;
-    }
-
-    private static String resolveName(String resourceName) {
-        return resourceName.startsWith("/") ? resourceName.substring(1) : resourceName;
     }
 
     @Override
@@ -62,10 +51,25 @@ public void connect() {
         }
         connected = true;
 
-        String resourceName = resolveName(url.getPath());
-        ResourceStorageEntry entry = Resources.get(Resources.toCanonicalForm(resourceName));
+        String urlHost = url.getHost();
+        String hostNameOrNull = urlHost != null && !urlHost.isEmpty() ? urlHost : null;
+        String urlPath = url.getPath();
+        if (urlPath.isEmpty()) {
+            throw new IllegalArgumentException("Empty URL path not allowed in " + JavaNetSubstitutions.RESOURCE_PROTOCOL + " URL");
+        }
+        String resourceName = urlPath.substring(1);
+        ResourceStorageEntry entry = Resources.get(hostNameOrNull, Resources.toCanonicalForm(resourceName));
         if (entry != null) {
             List<byte[]> bytes = entry.getData();
+            String urlRef = url.getRef();
+            int index = 0;
+            if (urlRef != null) {
+                try {
+                    index = Integer.valueOf(urlRef);
+                } catch (NumberFormatException e) {
+                    throw new IllegalArgumentException("URL anchor '#" + urlRef + "' not allowed in " + JavaNetSubstitutions.RESOURCE_PROTOCOL + " URL");
+                }
+            }
             if (index < bytes.size()) {
                 this.data = bytes.get(index);
             } else {
@@ -96,5 +100,4 @@ public long getContentLengthLong() {
         connect();
         return data != null ? data.length : -1L;
     }
-
 }

substratevm/src/com.oracle.svm.test/src/META-INF/native-image/com.oracle.svm.test/native-image.properties

@@ -5,5 +5,6 @@ Args= \
   --features=com.oracle.svm.test.AbstractServiceLoaderTest$TestFeature \
   --features=com.oracle.svm.test.NoProviderConstructorServiceLoaderTest$TestFeature \
   --features=com.oracle.svm.test.NativeImageResourceFileSystemProviderTest$TestFeature \
+  --add-opens=java.base/java.lang=ALL-UNNAMED \
   -H:+AllowVMInspection \
   --add-exports=org.graalvm.nativeimage.builder/com.oracle.svm.core.containers=ALL-UNNAMED

substratevm/src/com.oracle.svm.test/src/com/oracle/svm/test/AddExports.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2022, 2022, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.svm.test;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Specifies packages concealed in JDK modules used by a test. The mx unit test runner will ensure
+ * the packages are exported to the module containing annotated test class.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface AddExports {
+    /**
+     * The qualified name of the concealed package in {@code <module>/<package>} format (e.g.,
+     * "jdk.internal.vm.ci/jdk.vm.ci.code").
+     */
+    String[] value() default "";
+}

substratevm/src/com.oracle.svm.test/src/com/oracle/svm/test/NativeImageResourceFileSystemProviderTest.java

@@ -27,6 +27,7 @@
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
@@ -48,11 +49,15 @@
 import java.nio.file.attribute.FileTime;
 import java.nio.file.spi.FileSystemProvider;
 import java.util.Collections;
+import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.StreamSupport;
 
 import org.graalvm.nativeimage.ImageSingletons;
 import org.graalvm.nativeimage.hosted.Feature;
@@ -62,6 +67,7 @@
 
 import com.oracle.svm.core.configure.ResourcesRegistry;
 
+@AddExports("java.base/java.lang")
 public class NativeImageResourceFileSystemProviderTest {
 
     private static final String RESOURCE_DIR = "/resources";
@@ -79,6 +85,11 @@ public void beforeAnalysis(BeforeAnalysisAccess access) {
             // Remove leading / for the resource patterns
             registry.addResources(ConfigurationCondition.alwaysTrue(), RESOURCE_FILE_1.substring(1));
             registry.addResources(ConfigurationCondition.alwaysTrue(), RESOURCE_FILE_2.substring(1));
+
+            /** Needed for {@link #testURLExternalFormEquivalence()} */
+            for (Module module : ModuleLayer.boot().modules()) {
+                registry.addResources(ConfigurationCondition.alwaysTrue(), module.getName() + ":" + "module-info.class");
+            }
         }
     }
 
@@ -572,4 +583,52 @@ public void writingFileAttributes() {
         // 3. Closing file system.
         closeFileSystem(fileSystem);
     }
+
+    @Test
+    public void moduleResourceURLAccess() {
+        URL url = Class.class.getResource("uniName.dat");
+        Assert.assertNotNull("URL for resource java.base/java/lang/uniName.dat must not be null", url);
+        try (InputStream in = url.openStream()) {
+            try {
+                Assert.assertNotEquals("uniName.dat does not seem to contain valid data", in.read(), 0);
+            } catch (IOException e) {
+                Assert.fail("IOException in in.read(): " + e.getMessage());
+            }
+        } catch (IOException e) {
+            Assert.fail("IOException in url.openStream(): " + e.getMessage());
+        }
+    }
+
+    @Test
+    public void testURLExternalFormEquivalence() {
+        Enumeration<URL> urlEnumeration = null;
+        try {
+            urlEnumeration = ClassLoader.getSystemResources("module-info.class");
+        } catch (IOException e) {
+            Assert.fail("IOException in ClassLoader.getSystemResources(\"module-info.class\"): " + e.getMessage());
+        }
+
+        Assert.assertNotNull(urlEnumeration);
+        Enumeration<URL> finalVar = urlEnumeration;
+        Iterable<URL> urlIterable = () -> finalVar.asIterator();
+        List<URL> urlList = StreamSupport.stream(urlIterable.spliterator(), false).collect(Collectors.toList());
+        Assert.assertTrue("ClassLoader.getSystemResources(\"module-info.class\") must return many module-info.class URLs",
+                        urlList.size() > 3);
+
+        URL thirdEntry = urlList.get(2);
+        String thirdEntryExternalForm = thirdEntry.toExternalForm();
+        URL thirdEntryFromExternalForm = null;
+        try {
+            thirdEntryFromExternalForm = new URL(thirdEntryExternalForm);
+        } catch (MalformedURLException e) {
+            Assert.fail("Creating a new URL from the ExternalForm of another has to work: " + e.getMessage());
+        }
+
+        try {
+            boolean compareResult = compareTwoURLs(thirdEntry, thirdEntryFromExternalForm);
+            Assert.assertTrue("Contents of original URL and one created from originals ExternalForm must be the same", compareResult);
+        } catch (IOException e) {
+            Assert.fail("Contents of original URL and one created from originals ExternalForm must be the same: " + e);
+        }
+    }
 }

substratevm/src/com.oracle.svm.truffle.tck/src/com/oracle/svm/truffle/tck/resources/jre.json

@@ -172,30 +172,6 @@
         ]}
     ]
   },
-  {
-    "name" : "com.oracle.svm.core.jdk.Resources",
-    "methods" : [
-        { "name" : "createURL" ,
-          "parameterTypes" : [
-            "java.lang.String"
-        ]},
-        { "name" : "createURL" ,
-          "parameterTypes" : [
-            "java.lang.String",
-            "int"
-        ]}
-    ]
-  },
-    {
-    "name" : "com.oracle.svm.core.jdk.ResourcesHelper",
-    "methods" : [
-        { "name" : "urlToResource" ,
-          "parameterTypes" : [
-            "java.lang.String",
-            "java.net.URL"
-        ]}
-    ]
-  },
   {
     "name" : "com.oracle.svm.core.handles.ObjectHandlesImpl",
     "allDeclaredMethods" : true,