| /* |
| * $Header: /cvshome/build/org.osgi.framework/src/org/osgi/framework/BundlePermission.java,v 1.16 2007/02/20 00:06:02 hargrave Exp $ |
| * |
| * Copyright (c) OSGi Alliance (2004, 2007). All Rights Reserved. |
| * |
| * Licensed 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.osgi.framework; |
| |
| import java.io.IOException; |
| import java.security.*; |
| import java.util.Enumeration; |
| import java.util.Hashtable; |
| |
| /** |
| * A bundle's authority to require or provide a bundle or to receive or attach |
| * fragments. |
| * |
| * <p> |
| * A bundle symbolic name defines a unique fully qualified name. |
| * <p> |
| * For example: |
| * |
| * <pre> |
| * <code> |
| * org.osgi.example.bundle |
| * </code> |
| * </pre> |
| * |
| * <p> |
| * <code>BundlePermission</code> has four actions: <code>PROVIDE</code>, |
| * <code>REQUIRE</code>,<code>HOST</code>, and <code>FRAGMENT</code>. |
| * The <code>PROVIDE</code> action implies the <code>REQUIRE</code> action. |
| * |
| * @since 1.3 |
| * @version $Revision: 1.16 $ |
| */ |
| |
| public final class BundlePermission extends BasicPermission { |
| |
| private static final long serialVersionUID = 3257846601685873716L; |
| |
| /** |
| * The action string <code>provide</code>. |
| */ |
| public final static String PROVIDE = "provide"; |
| |
| /** |
| * The action string <code>require</code>. |
| */ |
| public final static String REQUIRE = "require"; |
| |
| /** |
| * The action string <code>host</code>. |
| */ |
| public final static String HOST = "host"; |
| |
| /** |
| * The action string <code>fragment</code>. |
| */ |
| public final static String FRAGMENT = "fragment"; |
| |
| private final static int ACTION_PROVIDE = 0x00000001; |
| private final static int ACTION_REQUIRE = 0x00000002; |
| private final static int ACTION_HOST = 0x00000004; |
| private final static int ACTION_FRAGMENT = 0x00000008; |
| private final static int ACTION_ALL = ACTION_PROVIDE |
| | ACTION_REQUIRE |
| | ACTION_HOST |
| | ACTION_FRAGMENT; |
| private final static int ACTION_NONE = 0; |
| /** |
| * The actions mask. |
| */ |
| private transient int action_mask = ACTION_NONE; |
| |
| /** |
| * The actions in canonical form. |
| * |
| * @serial |
| */ |
| private String actions = null; |
| |
| /** |
| * Defines the authority to provide and/or require and or specify a host |
| * fragment symbolic name within the OSGi environment. |
| * <p> |
| * Bundle Permissions are granted over all possible versions of a bundle. |
| * |
| * A bundle that needs to provide a bundle must have the appropriate |
| * <code>BundlePermission</code> for the symbolic name; a bundle that |
| * requires a bundle must have the appropriate <code>BundlePermssion</code> |
| * for that symbolic name; a bundle that specifies a fragment host must have |
| * the appropriate <code>BundlePermission</code> for that symbolic name. |
| * |
| * @param symbolicName the bundle symbolic name. |
| * @param actions <code>PROVIDE</code>,<code>REQUIRE</code>, |
| * <code>HOST</code>,<code>FRAGMENT</code> (canonical order). |
| */ |
| |
| public BundlePermission(String symbolicName, String actions) { |
| this(symbolicName, getMask(actions)); |
| } |
| |
| /** |
| * Bundle private constructor used by BundlePermissionCollection. |
| * |
| * @param symbolicName the bundle symbolic name |
| * @param mask the action mask |
| */ |
| BundlePermission(String symbolicName, int mask) { |
| super(symbolicName); |
| init(mask); |
| } |
| |
| /** |
| * Called by constructors and when deserialized. |
| * |
| * @param mask |
| */ |
| private void init(int mask) { |
| if ((mask == ACTION_NONE) || ((mask & ACTION_ALL) != mask)) { |
| throw new IllegalArgumentException("invalid action string"); |
| } |
| |
| action_mask = mask; |
| } |
| |
| /** |
| * Parse action string into action mask. |
| * |
| * @param actions Action string. |
| * @return action mask. |
| */ |
| private static int getMask(String actions) { |
| boolean seencomma = false; |
| |
| int mask = ACTION_NONE; |
| |
| if (actions == null) { |
| return (mask); |
| } |
| |
| char[] a = actions.toCharArray(); |
| |
| int i = a.length - 1; |
| if (i < 0) |
| return (mask); |
| |
| while (i != -1) { |
| char c; |
| |
| // skip whitespace |
| while ((i != -1) |
| && ((c = a[i]) == ' ' || c == '\r' || c == '\n' |
| || c == '\f' || c == '\t')) |
| i--; |
| |
| // check for the known strings |
| int matchlen; |
| |
| if (i >= 6 && (a[i - 6] == 'p' || a[i - 6] == 'P') |
| && (a[i - 5] == 'r' || a[i - 5] == 'R') |
| && (a[i - 4] == 'o' || a[i - 4] == 'O') |
| && (a[i - 3] == 'v' || a[i - 3] == 'V') |
| && (a[i - 2] == 'i' || a[i - 2] == 'I') |
| && (a[i - 1] == 'd' || a[i - 1] == 'D') |
| && (a[i] == 'e' || a[i] == 'E')) { |
| matchlen = 7; |
| mask |= ACTION_PROVIDE | ACTION_REQUIRE; |
| } |
| else |
| if (i >= 6 && (a[i - 6] == 'r' || a[i - 6] == 'R') |
| && (a[i - 5] == 'e' || a[i - 5] == 'E') |
| && (a[i - 4] == 'q' || a[i - 4] == 'Q') |
| && (a[i - 3] == 'u' || a[i - 3] == 'U') |
| && (a[i - 2] == 'i' || a[i - 2] == 'I') |
| && (a[i - 1] == 'r' || a[i - 1] == 'R') |
| && (a[i] == 'e' || a[i] == 'E')) { |
| matchlen = 7; |
| mask |= ACTION_REQUIRE; |
| } |
| else |
| if (i >= 3 && (a[i - 3] == 'h' || a[i - 3] == 'H') |
| && (a[i - 2] == 'o' || a[i - 2] == 'O') |
| && (a[i - 1] == 's' || a[i - 1] == 'S') |
| && (a[i] == 't' || a[i] == 'T')) { |
| matchlen = 4; |
| mask |= ACTION_HOST; |
| } |
| else |
| if (i >= 7 && (a[i - 7] == 'f' || a[i - 7] == 'F') |
| && (a[i - 6] == 'r' || a[i - 6] == 'R') |
| && (a[i - 5] == 'a' || a[i - 5] == 'A') |
| && (a[i - 4] == 'g' || a[i - 4] == 'G') |
| && (a[i - 3] == 'm' || a[i - 3] == 'M') |
| && (a[i - 2] == 'e' || a[i - 2] == 'E') |
| && (a[i - 1] == 'n' || a[i - 1] == 'N') |
| && (a[i] == 't' || a[i] == 'T')) { |
| matchlen = 8; |
| mask |= ACTION_FRAGMENT; |
| } |
| else { |
| // parse error |
| throw new IllegalArgumentException( |
| "invalid permission: " + actions); |
| } |
| |
| // make sure we didn't just match the tail of a word |
| // like "ackbarfrequire". Also, skip to the comma. |
| seencomma = false; |
| while (i >= matchlen && !seencomma) { |
| switch (a[i - matchlen]) { |
| case ',' : |
| seencomma = true; |
| /* FALLTHROUGH */ |
| case ' ' : |
| case '\r' : |
| case '\n' : |
| case '\f' : |
| case '\t' : |
| break; |
| default : |
| throw new IllegalArgumentException( |
| "invalid permission: " + actions); |
| } |
| i--; |
| } |
| |
| // point i at the location of the comma minus one (or -1). |
| i -= matchlen; |
| } |
| |
| if (seencomma) { |
| throw new IllegalArgumentException("invalid permission: " + actions); |
| } |
| |
| return (mask); |
| } |
| |
| /** |
| * Determines if the specified permission is implied by this object. |
| * |
| * <p> |
| * This method checks that the symbolic name of the target is implied by the |
| * symbolic name of this object. The list of <code>BundlePermission</code> |
| * actions must either match or allow for the list of the target object to |
| * imply the target <code>BundlePermission</code> action. |
| * <p> |
| * The permission to provide a bundle implies the permission to require the |
| * named symbolic name. |
| * |
| * <pre> |
| * x.y.*,"provide" -> x.y.z,"provide" is true |
| * *,"require" -> x.y, "require" is true |
| * *,"provide" -> x.y, "require" is true |
| * x.y,"provide" -> x.y.z, "provide" is false |
| * </pre> |
| * |
| * @param p The target permission to interrogate. |
| * @return <code>true</code> if the specified |
| * <code>BundlePermission</code> action is implied by this object; |
| * <code>false</code> otherwise. |
| */ |
| |
| public boolean implies(Permission p) { |
| if (p instanceof BundlePermission) { |
| BundlePermission target = (BundlePermission) p; |
| |
| return (((action_mask & target.action_mask) == target.action_mask) && super |
| .implies(p)); |
| } |
| |
| return (false); |
| } |
| |
| /** |
| * Returns the canonical string representation of the |
| * <code>BundlePermission</code> actions. |
| * |
| * <p> |
| * Always returns present <code>BundlePermission</code> actions in the |
| * following order: <code>PROVIDE</code>,<code>REQUIRE</code>, |
| * <code>HOST</code>,<code>FRAGMENT. |
| * @return Canonical string representation of the <code>BundlePermission</code> actions. |
| */ |
| |
| public String getActions() { |
| if (actions == null) { |
| StringBuffer sb = new StringBuffer(); |
| boolean comma = false; |
| |
| if ((action_mask & ACTION_PROVIDE) == ACTION_PROVIDE) { |
| sb.append(PROVIDE); |
| comma = true; |
| } |
| |
| if ((action_mask & ACTION_REQUIRE) == ACTION_REQUIRE) { |
| if (comma) |
| sb.append(','); |
| sb.append(REQUIRE); |
| comma = true; |
| } |
| |
| if ((action_mask & ACTION_HOST) == ACTION_HOST) { |
| if (comma) |
| sb.append(','); |
| sb.append(HOST); |
| comma = true; |
| } |
| |
| if ((action_mask & ACTION_FRAGMENT) == ACTION_FRAGMENT) { |
| if (comma) |
| sb.append(','); |
| sb.append(FRAGMENT); |
| } |
| |
| actions = sb.toString(); |
| } |
| |
| return (actions); |
| } |
| |
| /** |
| * Returns a new <code>PermissionCollection</code> object suitable for |
| * storing <code>BundlePermission</code> objects. |
| * |
| * @return A new <code>PermissionCollection</code> object. |
| */ |
| public PermissionCollection newPermissionCollection() { |
| return (new BundlePermissionCollection()); |
| } |
| |
| /** |
| * Determines the equality of two <code>BundlePermission</code> objects. |
| * |
| * This method checks that specified bundle has the same bundle symbolic |
| * name and <code>BundlePermission</code> actions as this |
| * <code>BundlePermission</code> object. |
| * |
| * @param obj The object to test for equality with this |
| * <code>BundlePermission</code> object. |
| * @return <code>true</code> if <code>obj</code> is a |
| * <code>BundlePermission</code>, and has the same bundle |
| * symbolic name and actions as this <code>BundlePermission</code> |
| * object; <code>false</code> otherwise. |
| */ |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return (true); |
| } |
| |
| if (!(obj instanceof BundlePermission)) { |
| return (false); |
| } |
| |
| BundlePermission p = (BundlePermission) obj; |
| |
| return ((action_mask == p.action_mask) && getName().equals(p.getName())); |
| } |
| |
| /** |
| * Returns the hash code value for this object. |
| * |
| * @return A hash code value for this object. |
| */ |
| |
| public int hashCode() { |
| return (getName().hashCode() ^ getActions().hashCode()); |
| } |
| |
| /** |
| * Returns the current action mask. |
| * <p> |
| * Used by the BundlePermissionCollection class. |
| * |
| * @return Current action mask. |
| */ |
| int getMask() { |
| return (action_mask); |
| } |
| |
| /** |
| * WriteObject is called to save the state of the |
| * <code>BundlePermission</code> object to a stream. The actions are |
| * serialized, and the superclass takes care of the name. |
| */ |
| |
| private synchronized void writeObject(java.io.ObjectOutputStream s) |
| throws IOException { |
| // Write out the actions. The superclass takes care of the name |
| // call getActions to make sure actions field is initialized |
| if (actions == null) |
| getActions(); |
| s.defaultWriteObject(); |
| } |
| |
| /** |
| * readObject is called to restore the state of the BundlePermission from a |
| * stream. |
| */ |
| private synchronized void readObject(java.io.ObjectInputStream s) |
| throws IOException, ClassNotFoundException { |
| // Read in the action, then initialize the rest |
| s.defaultReadObject(); |
| init(getMask(actions)); |
| } |
| } |
| |
| /** |
| * Stores a set of <code>BundlePermission</code> permissions. |
| * |
| * @see java.security.Permission |
| * @see java.security.Permissions |
| * @see java.security.PermissionCollection |
| */ |
| |
| final class BundlePermissionCollection extends PermissionCollection { |
| |
| /** |
| * Comment for <code>serialVersionUID</code> |
| */ |
| private static final long serialVersionUID = 3258407326846433079L; |
| |
| /** |
| * Table of permissions. |
| * |
| * @serial |
| */ |
| private Hashtable<String,Permission> permissions; |
| |
| /** |
| * Boolean saying if "*" is in the collection. |
| * |
| * @serial |
| */ |
| private boolean all_allowed; |
| |
| /** |
| * Create an empty BundlePermissions object. |
| * |
| */ |
| |
| public BundlePermissionCollection() { |
| permissions = new Hashtable<String,Permission>(); |
| all_allowed = false; |
| } |
| |
| /** |
| * Adds a permission to the <code>BundlePermission</code> objects. The key |
| * for the hash is the symbolic name. |
| * |
| * @param permission The <code>BundlePermission</code> object to add. |
| * |
| * @throws IllegalArgumentException If the permission is not a |
| * <code>BundlePermission</code> instance. |
| * @throws SecurityException If this <code>BundlePermissionCollection</code> |
| * object has been marked read-only. |
| */ |
| |
| public void add(Permission permission) { |
| if (!(permission instanceof BundlePermission)) |
| throw new IllegalArgumentException("invalid permission: " |
| + permission); |
| if (isReadOnly()) |
| throw new SecurityException("attempt to add a Permission to a " |
| + "readonly PermissionCollection"); |
| |
| BundlePermission bp = (BundlePermission) permission; |
| String name = bp.getName(); |
| |
| BundlePermission existing = (BundlePermission) permissions.get(name); |
| |
| if (existing != null) { |
| int oldMask = existing.getMask(); |
| int newMask = bp.getMask(); |
| if (oldMask != newMask) { |
| permissions.put(name, new BundlePermission(name, oldMask |
| | newMask)); |
| |
| } |
| } |
| else { |
| permissions.put(name, permission); |
| } |
| |
| if (!all_allowed) { |
| if (name.equals("*")) |
| all_allowed = true; |
| } |
| } |
| |
| /** |
| * Determines if the specified permissions implies the permissions expressed |
| * in <code>permission</code>. |
| * |
| * @param permission The Permission object to compare with this |
| * <code>BundlePermission</code> object. |
| * |
| * @return <code>true</code> if <code>permission</code> is a proper |
| * subset of a permission in the set; <code>false</code> |
| * otherwise. |
| */ |
| |
| public boolean implies(Permission permission) { |
| if (!(permission instanceof BundlePermission)) |
| return (false); |
| |
| BundlePermission bp = (BundlePermission) permission; |
| BundlePermission x; |
| |
| int desired = bp.getMask(); |
| int effective = 0; |
| |
| // short circuit if the "*" Permission was added |
| if (all_allowed) { |
| x = (BundlePermission) permissions.get("*"); |
| if (x != null) { |
| effective |= x.getMask(); |
| if ((effective & desired) == desired) |
| return (true); |
| } |
| } |
| |
| // strategy: |
| // Check for full match first. Then work our way up the |
| // name looking for matches on a.b.* |
| |
| String name = bp.getName(); |
| |
| x = (BundlePermission) permissions.get(name); |
| |
| if (x != null) { |
| // we have a direct hit! |
| effective |= x.getMask(); |
| if ((effective & desired) == desired) |
| return (true); |
| } |
| |
| // work our way up the tree... |
| int last, offset; |
| |
| offset = name.length() - 1; |
| |
| while ((last = name.lastIndexOf(".", offset)) != -1) { |
| |
| name = name.substring(0, last + 1) + "*"; |
| x = (BundlePermission) permissions.get(name); |
| |
| if (x != null) { |
| effective |= x.getMask(); |
| if ((effective & desired) == desired) |
| return (true); |
| } |
| offset = last - 1; |
| } |
| |
| // we don't have to check for "*" as it was already checked |
| // at the top (all_allowed), so we just return false |
| return (false); |
| } |
| |
| /** |
| * Returns an enumeration of all <code>BundlePermission</code> objects in |
| * the container. |
| * |
| * @return Enumeration of all <code>BundlePermission</code> objects. |
| */ |
| |
| public Enumeration<Permission> elements() { |
| return (permissions.elements()); |
| } |
| } |