org.osgi.service.monitor.MonitorPermission Maven / Gradle / Ivy
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/*
* Copyright (c) OSGi Alliance (2005, 2013). 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.service.monitor;
import java.io.UnsupportedEncodingException;
import java.security.Permission;
import java.util.StringTokenizer;
/**
* Indicates the callers authority to publish, read or reset
* {@code StatusVariable}s, to switch event sending on or off or to start
* monitoring jobs. The target of the permission is the identifier of the
* {@code StatusVariable}, the action can be {@code read}, {@code publish},
* {@code reset}, {@code startjob}, {@code switchevents}, or the combination of
* these separated by commas. Action names are interpreted case-insensitively,
* but the canonical action string returned by {@link #getActions()} uses the
* forms defined by the action constants.
*
* If the wildcard {@code *} appears in the actions field, all legal monitoring
* commands are allowed on the designated target(s) by the owner of the
* permission.
*
* @author $Id: 2899bf825eb4b7708601d99fb39019087deddefb $
*/
public class MonitorPermission extends Permission {
/**
*
*/
private static final long serialVersionUID = -9084425194463274314L;
/**
* Holders of {@code MonitorPermission} with the {@code read} action present
* are allowed to read the value of the {@code StatusVariable}s specified in
* the permission's target field.
*/
public static final String READ = "read";
/**
* Holders of {@code MonitorPermission} with the {@code reset} action
* present are allowed to reset the value of the {@code StatusVariable}s
* specified in the permission's target field.
*/
public static final String RESET = "reset";
/**
* Holders of {@code MonitorPermission} with the {@code publish} action
* present are {@code Monitorable} services that are allowed to publish the
* {@code StatusVariable}s specified in the permission's target field. Note,
* that this permission cannot be enforced when a {@code Monitorable}
* registers to the framework, because the Service Registry does not know
* about this permission. Instead, any {@code StatusVariable}s published by
* a {@code Monitorable} without the corresponding {@code publish}
* permission are silently ignored by {@code MonitorAdmin}, and are
* therefore invisible to the users of the monitoring service.
*/
public static final String PUBLISH = "publish";
/**
* Holders of {@code MonitorPermission} with the {@code startjob} action
* present are allowed to initiate monitoring jobs involving the
* {@code StatusVariable}s specified in the permission's target field.
*
* A minimal sampling interval can be optionally defined in the following
* form: {@code startjob:n}. This allows the holder of the permission to
* initiate time based jobs with a measurement interval of at least
* {@code n} seconds. If {@code n} is not specified or 0 then the holder of
* this permission is allowed to start monitoring jobs specifying any
* frequency.
*/
public static final String STARTJOB = "startjob";
/**
* Holders of {@code MonitorPermission} with the {@code switchevents} action
* present are allowed to switch event sending on or off for the value of
* the {@code StatusVariable}s specified in the permission's target field.
*/
public static final String SWITCHEVENTS = "switchevents";
private static final int READ_FLAG = 0x1;
private static final int RESET_FLAG = 0x2;
private static final int PUBLISH_FLAG = 0x4;
private static final int STARTJOB_FLAG = 0x8;
private static final int SWITCHEVENTS_FLAG = 0x10;
private static final int ALL_FLAGS = READ_FLAG | RESET_FLAG | PUBLISH_FLAG | STARTJOB_FLAG | SWITCHEVENTS_FLAG;
private String monId;
private String varId;
private boolean prefixMonId;
private boolean prefixVarId;
private int mask;
private int minJobInterval;
/**
* Create a {@code MonitorPermission} object, specifying the target and
* actions.
*
* The {@code statusVariable} parameter is the target of the permission,
* defining one or more status variable names to which the specified actions
* apply. Multiple status variable names can be selected by using the
* wildcard {@code *} in the target string. The wildcard is allowed in both
* fragments, but only at the end of the fragments.
*
* For example, the following targets are valid:
* {@code com.mycomp.myapp/queue_length}, {@code com.mycomp.myapp/*},
* com.mycomp.*/*, */*,
* */queue_length, */queue*.
*
* The following targets are invalid: {@code *.myapp/queue_length},
* {@code com.*.myapp/*}, {@code *}.
*
* The {@code actions} parameter specifies the allowed action(s):
* {@code read}, {@code publish}, {@code startjob}, {@code reset},
* {@code switchevents}, or the combination of these separated by commas.
* String constants are defined in this class for each valid action. Passing
* {@code "*"} as the action string is equivalent to listing all actions.
*
* @param statusVariable the identifier of the {@code StatusVariable} in
* [Monitorable_id]/[StatusVariable_id] format
* @param actions the list of allowed actions separated by commas, or
* {@code *} for all actions
* @throws java.lang.IllegalArgumentException if either parameter is
* {@code null}, or invalid with regard to the constraints defined
* above and in the documentation of the used actions
*/
public MonitorPermission(String statusVariable, String actions) throws IllegalArgumentException {
super(statusVariable);
if (statusVariable == null)
throw new IllegalArgumentException("Invalid StatusVariable path 'null'.");
if (actions == null)
throw new IllegalArgumentException("Invalid actions string 'null'.");
int sep = statusVariable.indexOf('/');
int len = statusVariable.length();
if (sep == -1)
throw new IllegalArgumentException("Invalid StatusVariable path: should contain '/' separator.");
if (sep == 0 || sep == statusVariable.length() - 1)
throw new IllegalArgumentException("Invalid StatusVariable path: empty monitorable ID or StatusVariable name.");
prefixMonId = statusVariable.charAt(sep - 1) == '*';
prefixVarId = statusVariable.charAt(len - 1) == '*';
monId = statusVariable.substring(0, prefixMonId ? sep - 1 : sep);
varId = statusVariable.substring(sep + 1, prefixVarId ? len - 1 : len);
checkId(monId, "Monitorable ID part of the target");
checkId(varId, "Status Variable ID part of the target");
minJobInterval = 0;
if (actions.equals("*"))
mask = ALL_FLAGS;
else {
mask = 0;
StringTokenizer st = new StringTokenizer(actions, ",");
while (st.hasMoreTokens()) {
String action = st.nextToken().trim();
if (action.equalsIgnoreCase(READ)) {
addToMask(READ_FLAG, READ);
} else
if (action.equalsIgnoreCase(RESET)) {
addToMask(RESET_FLAG, RESET);
} else
if (action.equalsIgnoreCase(PUBLISH)) {
addToMask(PUBLISH_FLAG, PUBLISH);
} else
if (action.equalsIgnoreCase(SWITCHEVENTS)) {
addToMask(SWITCHEVENTS_FLAG, SWITCHEVENTS);
} else
if (action.toLowerCase().startsWith(STARTJOB)) {
minJobInterval = 0;
int slen = STARTJOB.length();
if (action.length() != slen) {
if (action.charAt(slen) != ':')
throw new IllegalArgumentException("Invalid action '" + action + "'.");
try {
minJobInterval = Integer.parseInt(action.substring(slen + 1));
} catch (NumberFormatException e) {
throw new IllegalArgumentException("Invalid parameter in startjob action '" + action + "'.");
}
}
addToMask(STARTJOB_FLAG, STARTJOB);
} else
throw new IllegalArgumentException("Invalid action '" + action + "'");
}
}
}
private void addToMask(int action, String actionString) {
if ((mask & action) != 0)
throw new IllegalArgumentException("Invalid action string: " + actionString + " appears multiple times.");
mask |= action;
}
private void checkId(String id, String idName) throws IllegalArgumentException {
byte[] nameBytes;
try {
nameBytes = id.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
// never happens, "UTF-8" must always be supported
throw new IllegalStateException(e.getMessage());
}
if (nameBytes.length > StatusVariable.MAX_ID_LENGTH)
throw new IllegalArgumentException(idName + " is too long (over " + StatusVariable.MAX_ID_LENGTH + " bytes in UTF-8 encoding).");
if (id.equals(".") || id.equals(".."))
throw new IllegalArgumentException(idName + " is invalid.");
char[] chars = id.toCharArray();
for (int i = 0; i < chars.length; i++)
if (StatusVariable.SYMBOLIC_NAME_CHARACTERS.indexOf(chars[i]) == -1)
throw new IllegalArgumentException(idName + " contains invalid characters.");
}
/**
* Create an integer hash of the object. The hash codes of
* {@code MonitorPermission}s {@code p1} and {@code p2} are the same if
* {@code p1.equals(p2)}.
*
* @return the hash of the object
*/
public int hashCode() {
return new Integer(mask).hashCode() ^ new Integer(minJobInterval).hashCode() ^ monId.hashCode() ^ new Boolean(prefixMonId).hashCode() ^ varId.hashCode() ^ new Boolean(prefixVarId).hashCode();
}
/**
* Determines the equality of two {@code MonitorPermission} objects. Two
* {@code MonitorPermission} objects are equal if their target strings are
* equal and the same set of actions are listed in their action strings.
*
* @param o the object being compared for equality with this object
* @return {@code true} if the two permissions are equal
*/
public boolean equals(Object o) {
if (!(o instanceof MonitorPermission))
return false;
MonitorPermission other = (MonitorPermission) o;
return mask == other.mask && minJobInterval == other.minJobInterval && monId.equals(other.monId) && prefixMonId == other.prefixMonId && varId.equals(other.varId)
&& prefixVarId == other.prefixVarId;
}
/**
* Get the action string associated with this permission. The actions are
* returned in the following order: {@code read}, {@code reset},
* {@code publish}, {@code startjob}, {@code switchevents}.
*
* @return the allowed actions separated by commas, cannot be {@code null}
*/
public String getActions() {
StringBuffer sb = new StringBuffer();
appendAction(sb, READ_FLAG, READ);
appendAction(sb, RESET_FLAG, RESET);
appendAction(sb, PUBLISH_FLAG, PUBLISH);
appendAction(sb, STARTJOB_FLAG, STARTJOB);
appendAction(sb, SWITCHEVENTS_FLAG, SWITCHEVENTS);
return sb.toString();
}
private void appendAction(StringBuffer sb, int flag, String actionName) {
if ((mask & flag) != 0) {
if (sb.length() != 0)
sb.append(',');
sb.append(actionName);
if (flag == STARTJOB_FLAG && minJobInterval != 0)
sb.append(':').append(minJobInterval);
}
}
/**
* Determines if the specified permission is implied by this permission.
*
* This method returns {@code false} if and only if at least one of the
* following conditions are fulfilled for the specified permission:
*
* - it is not a {@code MonitorPermission}
* - it has a broader set of actions allowed than this one
* - it allows initiating time based monitoring jobs with a lower minimal
* sampling interval
* - the target set of {@code Monitorable}s is not the same nor a subset
* of the target set of {@code Monitorable}s of this permission
* - the target set of {@code StatusVariable}s is not the same nor a
* subset of the target set of {@code StatusVariable}s of this permission
*
*
* @param p the permission to be checked
* @return {@code true} if the given permission is implied by this
* permission
*/
public boolean implies(Permission p) {
if (!(p instanceof MonitorPermission))
return false;
MonitorPermission other = (MonitorPermission) p;
if ((mask & other.mask) != other.mask)
return false;
if ((other.mask & STARTJOB_FLAG) != 0 && minJobInterval > other.minJobInterval)
return false;
return implies(monId, prefixMonId, other.monId, other.prefixMonId) && implies(varId, prefixVarId, other.varId, other.prefixVarId);
}
private boolean implies(String id, boolean prefix, String oid, boolean oprefix) {
return prefix ? oid.startsWith(id) : !oprefix && id.equals(oid);
}
}