| /******************************************************************************* |
| * Copyright (c) 2003, 2016 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.storage; |
| |
| import java.io.*; |
| import java.util.*; |
| |
| /** |
| * Permission Storage interface for managing a persistent storage of |
| * bundle permissions. |
| * |
| * <p>This class is used to provide methods to manage |
| * persistent storage of bundle permissions. |
| */ |
| public class PermissionData { |
| private static final int PERMDATA_VERSION = 1; |
| private final Map<String, String[]> locations = new HashMap<>(); |
| private String[] defaultInfos; |
| private String[] condPermInfos; |
| private boolean dirty; |
| |
| /** |
| * Returns the locations that have permission data assigned to them, |
| * that is, locations for which permission data |
| * exists in persistent storage. |
| * |
| * @return The locations that have permission data in |
| * persistent storage, or <tt>null</tt> if there is no permission data |
| * in persistent storage. |
| */ |
| public String[] getLocations() { |
| synchronized (locations) { |
| String[] result = new String[locations.size()]; |
| int i = 0; |
| for (Iterator<String> iLocs = locations.keySet().iterator(); iLocs.hasNext(); i++) |
| result[i] = iLocs.next(); |
| return result; |
| } |
| } |
| |
| /** |
| * Gets the permission data assigned to the specified |
| * location. |
| * |
| * @param location The location whose permission data is to |
| * be returned. |
| * The location can be <tt>null</tt> for the default permission data. |
| * |
| * @return The permission data assigned to the specified |
| * location, or <tt>null</tt> if that location has not been assigned any |
| * permission data. |
| */ |
| public String[] getPermissionData(String location) { |
| if (location == null) |
| return defaultInfos; |
| synchronized (locations) { |
| if (locations.size() == 0) |
| return null; |
| return locations.get(location); |
| } |
| } |
| |
| /** |
| * Assigns the specified permission data to the specified |
| * location. |
| * |
| * @param location The location that will be assigned the |
| * permissions. |
| * The location can be <tt>null</tt> for the default permission data. |
| * @param data The permission data to be assigned, or <tt>null</tt> |
| * if the specified location is to be removed from persistent storaqe. |
| */ |
| public void setPermissionData(String location, String[] data) { |
| if (location == null) { |
| defaultInfos = data; |
| return; |
| } |
| synchronized (locations) { |
| if (data == null) |
| locations.remove(location); |
| else |
| locations.put(location, data); |
| } |
| setDirty(true); |
| } |
| |
| /** |
| * Persists the array of encoded ConditionalPermissionInfo strings |
| * @param infos an array of encoded ConditionalPermissionInfo strings |
| */ |
| public void saveConditionalPermissionInfos(String[] infos) { |
| condPermInfos = infos; |
| setDirty(true); |
| } |
| |
| /** |
| * Returns the persistent array of encoded ConditionalPermissionInfo strings |
| * @return an array of encoded ConditionalPermissionInfo strings or null |
| * if none exist in persistent storage. |
| */ |
| public String[] getConditionalPermissionInfos() { |
| return condPermInfos; |
| } |
| |
| boolean isDirty() { |
| return dirty; |
| } |
| |
| private void setDirty(boolean dirty) { |
| this.dirty = dirty; |
| } |
| |
| void readPermissionData(DataInputStream in) throws IOException { |
| int version = in.readInt(); |
| int dataSize = in.readInt(); |
| byte[] bytes = new byte[dataSize]; |
| in.readFully(bytes); |
| if (PERMDATA_VERSION == version) { |
| DataInputStream temp = new DataInputStream(new ByteArrayInputStream(bytes)); |
| try { |
| // read the default permissions first |
| int numPerms = temp.readInt(); |
| if (numPerms > 0) { |
| String[] perms = new String[numPerms]; |
| for (int i = 0; i < numPerms; i++) |
| perms[i] = temp.readUTF(); |
| setPermissionData(null, perms); |
| } |
| int numLocs = temp.readInt(); |
| if (numLocs > 0) { |
| for (int i = 0; i < numLocs; i++) { |
| String loc = temp.readUTF(); |
| numPerms = temp.readInt(); |
| String[] perms = new String[numPerms]; |
| for (int j = 0; j < numPerms; j++) |
| perms[j] = temp.readUTF(); |
| setPermissionData(loc, perms); |
| } |
| } |
| int numCondPerms = temp.readInt(); |
| if (numCondPerms > 0) { |
| String[] condPerms = new String[numCondPerms]; |
| for (int i = 0; i < numCondPerms; i++) { |
| condPerms[i] = temp.readUTF(); |
| } |
| saveConditionalPermissionInfos(condPerms); |
| } |
| |
| } finally { |
| setDirty(false); |
| temp.close(); |
| } |
| } |
| } |
| |
| void savePermissionData(DataOutputStream out) throws IOException { |
| out.writeInt(PERMDATA_VERSION); |
| // create a temporary in memory stream so we can figure out the length |
| ByteArrayOutputStream tempBytes = new ByteArrayOutputStream(); |
| DataOutputStream temp = new DataOutputStream(tempBytes); |
| // always write the default permissions first |
| String[] defaultPerms = getPermissionData(null); |
| temp.writeInt(defaultPerms == null ? 0 : defaultPerms.length); |
| if (defaultPerms != null) |
| for (int i = 0; i < defaultPerms.length; i++) |
| temp.writeUTF(defaultPerms[i]); |
| String[] locs = getLocations(); |
| temp.writeInt(locs == null ? 0 : locs.length); |
| if (locs != null) |
| for (int i = 0; i < locs.length; i++) { |
| temp.writeUTF(locs[i]); |
| String[] perms = getPermissionData(locs[i]); |
| temp.writeInt(perms == null ? 0 : perms.length); |
| if (perms != null) |
| for (int j = 0; j < perms.length; j++) |
| temp.writeUTF(perms[j]); |
| } |
| String[] condPerms = getConditionalPermissionInfos(); |
| temp.writeInt(condPerms == null ? 0 : condPerms.length); |
| if (condPerms != null) |
| for (int i = 0; i < condPerms.length; i++) |
| temp.writeUTF(condPerms[i]); |
| temp.close(); |
| |
| out.writeInt(tempBytes.size()); |
| out.write(tempBytes.toByteArray()); |
| setDirty(false); |
| } |
| } |