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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2008, 2021 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.osgi.internal.permadmin;

import java.io.File;
import java.io.FilePermission;
import java.lang.reflect.Constructor;
import java.security.AccessController;
import java.security.AllPermission;
import java.security.Permission;
import java.security.PermissionCollection;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import org.osgi.service.permissionadmin.PermissionInfo;

public final class PermissionInfoCollection extends PermissionCollection {
	private static final long serialVersionUID = 3140511562980923957L;
	/* Used to find permission constructors in addPermissions */
	static private final Class twoStringClassArray[] = new Class[] {String.class, String.class};
	static private final Class oneStringClassArray[] = new Class[] {String.class};
	static private final Class noArgClassArray[] = new Class[] {};
	static private final Class[][] permClassArrayArgs = new Class[][] {noArgClassArray, oneStringClassArray, twoStringClassArray};
	static private final String ALL_PERMISSION_NAME = AllPermission.class.getName();
	static final String FILE_PERMISSION_NAME = FilePermission.class.getName();
	static final String ALL_FILES = "<>"; //$NON-NLS-1$

	/* @GuardedBy(cachedPermissionCollections) */
	private final Map, PermissionCollection> cachedPermissionCollections = new HashMap<>();
	private final Map cachedRelativeFilePermissionCollections;
	private final boolean hasAllPermission;
	private final PermissionInfo[] permInfos;

	public PermissionInfoCollection(PermissionInfo[] permInfos) {
		this.permInfos = permInfos;
		boolean tempAllPermissions = false;
		boolean allAbsolutePaths = true;
		for (PermissionInfo info : permInfos) {
			if (ALL_PERMISSION_NAME.equals(info.getType())) {
				tempAllPermissions = true;
			} else if (FILE_PERMISSION_NAME.equals(info.getType())) {
				if (!(new File(info.getActions()).isAbsolute())) {
					allAbsolutePaths = false;
				}
			}
		}
		this.hasAllPermission = tempAllPermissions;
		this.cachedRelativeFilePermissionCollections = allAbsolutePaths ? null : new HashMap<>();
		setReadOnly(); // collections are managed with ConditionalPermissionAdmin
	}

	@Override
	public void add(Permission arg0) {
		throw new SecurityException();
	}

	@Override
	public Enumeration elements() {
		// TODO return an empty enumeration for now;
		return Collections.emptyEnumeration();
	}

	@Override
	public boolean implies(Permission perm) {
		return implies(null, perm);
	}

	boolean implies(final BundlePermissions bundlePermissions, Permission perm) {
		if (hasAllPermission)
			return true;
		final Class permClass = perm.getClass();
		PermissionCollection collection = getCachedCollection(bundlePermissions, permClass);
		// must populate the collection outside of the lock to prevent class loader deadlock
		if (collection == null) {
			collection = perm.newPermissionCollection();
			if (collection == null) {
				collection = new PermissionsHash();
			}
			try {
				final PermissionCollection targetCollection = collection;
				AccessController.doPrivileged((PrivilegedExceptionAction) () -> {
					addPermissions(bundlePermissions, targetCollection, permClass);
					return null;
				});

			} catch (Exception e) {
				if (e instanceof PrivilegedActionException) {
					e = ((PrivilegedActionException) e).getException();
				}
				throw new SecurityException("Exception creating permissions: " + permClass + ": " + e.getMessage(), e); //$NON-NLS-1$ //$NON-NLS-2$
			}
			collection = cacheCollection(bundlePermissions, permClass, collection);
		}
		return collection.implies(perm);
	}

	PermissionCollection getCachedCollection(BundlePermissions bundlePermissions, Class permClass) {
		synchronized (cachedPermissionCollections) {
			if (bundlePermissions != null && cachedRelativeFilePermissionCollections != null && FILE_PERMISSION_NAME.equals(permClass.getName())) {
				return cachedRelativeFilePermissionCollections.get(bundlePermissions);
			}
			return cachedPermissionCollections.get(permClass);
		}
	}

	private PermissionCollection cacheCollection(BundlePermissions bundlePermissions, Class permClass, PermissionCollection collection) {
		synchronized (cachedPermissionCollections) {
			// check to see if another thread beat this thread at adding the collection
			boolean relativeFiles = bundlePermissions != null && cachedRelativeFilePermissionCollections != null && FILE_PERMISSION_NAME.equals(permClass.getName());
			PermissionCollection exists = relativeFiles ? cachedRelativeFilePermissionCollections.get(bundlePermissions) : cachedPermissionCollections.get(permClass);
			if (exists != null) {
				collection = exists;
			} else {
				if (relativeFiles) {
					cachedRelativeFilePermissionCollections.put(bundlePermissions, collection);
				} else {
					cachedPermissionCollections.put(permClass, collection);
				}
			}
			return collection;
		}
	}

	PermissionInfo[] getPermissionInfos() {
		return permInfos;
	}

	void addPermissions(BundlePermissions bundlePermissions, PermissionCollection collection, Class permClass) throws Exception {
		String permClassName = permClass.getName();
		Constructor constructor = null;
		int numArgs = -1;
		for (int i = permClassArrayArgs.length - 1; i >= 0; i--) {
			try {
				constructor = permClass.getConstructor(permClassArrayArgs[i]);
				numArgs = i;
				break;
			} catch (NoSuchMethodException e) {
				// ignore
			}
		}
		if (constructor == null) {
			throw new NoSuchMethodException(permClass.getName() + ".()"); //$NON-NLS-1$
		}
		/*
		 * TODO: We need to cache the permission constructors to enhance performance (see bug 118813).
		 */
		for (PermissionInfo permInfo : permInfos) {
			if (permInfo.getType().equals(permClassName)) {
				String args[] = new String[numArgs];
				if (numArgs > 0) {
					args[0] = permInfo.getName();
				}
				if (numArgs > 1) {
					args[1] = permInfo.getActions();
				}
				if (permInfo.getType().equals(FILE_PERMISSION_NAME)) {
					// map FilePermissions for relative names to the bundle's data area
					if (!args[0].equals(ALL_FILES)) {
						File file = new File(args[0]);
						if (!file.isAbsolute()) { // relative name
							File target = bundlePermissions == null ? null : bundlePermissions.getBundle().getDataFile(permInfo.getName());
							if (target == null) {
								// ignore if we cannot find the data area
								continue;
							}
							args[0] = target.getPath();
						}
					}
				}
				collection.add(constructor.newInstance((Object[]) args));
			}
		}
	}

	void clearPermissionCache() {
		synchronized (cachedPermissionCollections) {
			cachedPermissionCollections.clear();
			if (cachedRelativeFilePermissionCollections != null) {
				cachedRelativeFilePermissionCollections.clear();
			}
		}
	}
}
 















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