[GitHub] [sling-org-apache-sling-feature-apiregions] bosschaert commented on a change in pull request #1: SLING-8815 - [API Regions] Prevent from resolving to customer-provided bundles

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bosschaert commented on a change in pull request #1: SLING-8815 - [API Regions] Prevent from resolving to customer-provided bundles
URL: https://github.com/apache/sling-org-apache-sling-feature-apiregions/pull/1#discussion_r341507855
 
 

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 File path: src/main/java/org/apache/sling/feature/apiregions/impl/PlatformIsolationHook.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.sling.feature.apiregions.impl;
+
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Map;
+
+import org.osgi.framework.Version;
+import org.osgi.framework.hooks.resolver.ResolverHook;
+import org.osgi.framework.wiring.BundleCapability;
+import org.osgi.framework.wiring.BundleRequirement;
+import org.osgi.framework.wiring.BundleRevision;
+
+public class PlatformIsolationHook implements ResolverHook {
+
+    protected static final String OSGI_WIRING_PACKAGE_NAMESPACE = "osgi.wiring.package";
+
+    private final Map<String, Version> bsnVerMap;
+
+    PlatformIsolationHook(Map<String, Version> bsnVerMap) {
+        this.bsnVerMap = bsnVerMap;
+    }
+
+    @Override
+    public void filterResolvable(Collection<BundleRevision> candidates) {
+        // not used in this version
+    }
+
+    @Override
+    public void filterSingletonCollisions(BundleCapability singleton, Collection<BundleCapability> collisionCandidates) {
+        // not used in this version
+    }
+
+    @Override
+    public void filterMatches(BundleRequirement requirement, Collection<BundleCapability> candidates) {
+        for (Iterator<BundleCapability> it = candidates.iterator(); it.hasNext();) {
+            BundleCapability candidate = it.next();
+
+            BundleRevision rev = candidate.getRevision();
+
+            // bundle is allowed to wire to itself
+            if (requirement.getRevision().getBundle().getBundleId() == rev.getBundle().getBundleId()) {
+                continue;
+            }
+
+            // is it a restricted bundle?
+            if (filter(requirement, candidate)) {
+                it.remove();
+                // LOG.info("Prevented {} from resolving to {}", requirement, candidate);
+            }
+        }
+    }
+
+    boolean filter(BundleRequirement requirement, BundleCapability candidate) {
+        String requirementNamespace = requirement.getNamespace();
+        String candidateNamespace = candidate.getNamespace();
+        if (!OSGI_WIRING_PACKAGE_NAMESPACE.equals(requirementNamespace)
+                || !requirementNamespace.equals(candidateNamespace)) {
+            return false; // checking wiring packages only
+        }
+
+        BundleRevision candidateRevision = candidate.getRevision();
+        String candidateSymbolicName = candidateRevision.getSymbolicName();
+        Version candidateVersion = candidateRevision.getVersion();
+
+        Version expectedVersion = bsnVerMap.get(candidateSymbolicName);
+
+        return expectedVersion != null && !expectedVersion.equals(candidateVersion);
 
 Review comment:
   It looks if the candidate is on the bsnver map.
   If not (expected version == null) it should return `true` I think, because then it's not a platform bundle and the platform should not wire to it.
   If the expected version != null, then it should return 
   
       !expectedVersion.equals(candidateVersion);
   
   as you already do

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