* The actions string of a URLPermission is a concatenation of the <i>method list * and the <i>request headers list. These are lists of the permitted request * methods and permitted request headers of the permission (respectively). The two lists * are separated by a colon ':' character and elements of each list are comma separated. * Some examples are: * <pre> * "POST,GET,DELETE" * "GET:X-Foo-Request,X-Bar-Request" * "POST,GET:Header1,Header2" * </pre> * The first example specifies the methods: POST, GET and DELETE, but no request headers. * The second example specifies one request method and two headers. The third * example specifies two request methods, and two headers. * <p> * The colon separator need not be present if the request headers list is empty. * No white-space is permitted in the actions string. The action strings supplied to * the URLPermission constructors are case-insensitive and are normalized by converting * method names to upper-case and header names to the form defines in RFC2616 (lower case * with initial letter of each word capitalized). Either list can contain a wild-card '*' * character which signifies all request methods or headers respectively. * <p> * Note. Depending on the context of use, some request methods and headers may be permitted * at all times, and others may not be permitted at any time. For example, the * HTTP protocol handler might disallow certain headers such as Content-Length * from being set by application code, regardless of whether the security policy * in force, permits it. * * @since 1.8 */ public final class URLPermission extends Permission { private static final long serialVersionUID = -2702463814894478682L; private transient String scheme; private transient String ssp; // scheme specific part private transient String path; private transient List<String> methods; private transient List<String> requestHeaders; private transient Authority authority; // serialized field private String actions; /** * Creates a new URLPermission from a url string and which permits the given * request methods and user-settable request headers. * The name of the permission is the url string it was created with. Only the scheme, * authority and path components of the url are used internally. Any fragment or query * components are ignored. The permissions action string is as specified above. * * @param url the url string * * @param actions the actions string * * @exception IllegalArgumentException if url is invalid or if actions contains white-space. */ public URLPermission(String url, String actions) { super(url); init(actions); } private void init(String actions) { parseURI(getName()); int colon = actions.indexOf(':'); if (actions.lastIndexOf(':') != colon) { throw new IllegalArgumentException("invalid actions string"); } String methods, headers; if (colon == -1) { methods = actions; headers = ""; } else { methods = actions.substring(0, colon); headers = actions.substring(colon+1); } List<String> l = normalizeMethods(methods); Collections.sort(l); this.methods = Collections.unmodifiableList(l); l = normalizeHeaders(headers); Collections.sort(l); this.requestHeaders = Collections.unmodifiableList(l); this.actions = actions(); } /** * Creates a URLPermission with the given url string and unrestricted * methods and request headers by invoking the two argument * constructor as follows: URLPermission(url, "*:*") * * @param url the url string * * @throws IllegalArgumentException if url does not result in a valid {@link URI} */ public URLPermission(String url) { this(url, "*:*"); } /** * Returns the normalized method list and request * header list, in the form: * <pre> * "method-names : header-names" * </pre> * <p> * where method-names is the list of methods separated by commas * and header-names is the list of permitted headers separated by commas. * There is no white space in the returned String. If header-names is empty * then the colon separator will not be present. */ public String getActions() { return actions; } /** * Checks if this URLPermission implies the given permission. * Specifically, the following checks are done as if in the * following sequence: * <ul> * <li>if 'p' is not an instance of URLPermission return false * <li>if any of p's methods are not in this's method list, and if * this's method list is not equal to "*", then return false.</li> * <li>if any of p's headers are not in this's request header list, and if * this's request header list is not equal to "*", then return false.</li> * <li>if this's url scheme is not equal to p's url scheme return false * <li>if the scheme specific part of this's url is '*' return true * <li>if the set of hosts defined by p's url hostrange is not a subset of * this's url hostrange then return false. For example, "*.foo.oracle.com" * is a subset of "*.oracle.com". "foo.bar.oracle.com" is not * a subset of "*.foo.oracle.com"</li> * <li>if the portrange defined by p's url is not a subset of the * portrange defined by this's url then return false. * <li>if the path or paths specified by p's url are contained in the * set of paths specified by this's url, then return true * <li>otherwise, return false * </ul> * <p>Some examples of how paths are matched are shown below: * <table border> * <caption>Examples of Path Matching * <tr>
* <tr> * <tr> * <tr> * <tr> * <tr> * <tr> * <tr> * </table> */ public boolean implies(Permission p) { if (! (p instanceof URLPermission)) { return false; } URLPermission that = (URLPermission)p; if (!this.methods.get(0).equals("*") && Collections.indexOfSubList(this.methods, that.methods) == -1) { return false; } if (this.requestHeaders.isEmpty() && !that.requestHeaders.isEmpty()) { return false; } if (!this.requestHeaders.isEmpty() && !this.requestHeaders.get(0).equals("*") && Collections.indexOfSubList(this.requestHeaders, that.requestHeaders) == -1) { return false; } if (!this.scheme.equals(that.scheme)) { return false; } if (this.ssp.equals("*")) { return true; } if (!this.authority.implies(that.authority)) { return false; } if (this.path == null) { return that.path == null; } if (that.path == null) { return false; } if (this.path.endsWith("/-")) { String thisprefix = this.path.substring(0, this.path.length() - 1); return that.path.startsWith(thisprefix); } if (this.path.endsWith("/*")) { String thisprefix = this.path.substring(0, this.path.length() - 1); if (!that.path.startsWith(thisprefix)) { return false; } String thatsuffix = that.path.substring(thisprefix.length()); // suffix must not contain '/' chars if (thatsuffix.indexOf('/') != -1) { return false; } if (thatsuffix.equals("-")) { return false; } return true; } return this.path.equals(that.path); } /** * Returns true if, this.getActions().equals(p.getActions()) * and p's url equals this's url. Returns false otherwise. */ public boolean equals(Object p) { if (!(p instanceof URLPermission)) { return false; } URLPermission that = (URLPermission)p; if (!this.scheme.equals(that.scheme)) { return false; } if (!this.getActions().equals(that.getActions())) { return false; } if (!this.authority.equals(that.authority)) { return false; } if (this.path != null) { return this.path.equals(that.path); } else { return that.path == null; } } /** * Returns a hashcode calculated from the hashcode of the * actions String and the url string. */ public int hashCode() { return getActions().hashCode() + scheme.hashCode() + authority.hashCode() + (path == null ? 0 : path.hashCode()); } private List<String> normalizeMethods(String methods) { List<String> l = new ArrayList<>(); StringBuilder b = new StringBuilder(); for (int i=0; i<methods.length(); i++) { char c = methods.charAt(i); if (c == ',') { String s = b.toString(); if (s.length() > 0) l.add(s); b = new StringBuilder(); } else if (c == ' ' || c == '\t') { throw new IllegalArgumentException("white space not allowed"); } else { if (c >= 'a' && c <= 'z') { c += 'A' - 'a'; } b.append(c); } } String s = b.toString(); if (s.length() > 0) l.add(s); return l; } private List<String> normalizeHeaders(String headers) { List<String> l = new ArrayList<>(); StringBuilder b = new StringBuilder(); boolean capitalizeNext = true; for (int i=0; i<headers.length(); i++) { char c = headers.charAt(i); if (c >= 'a' && c <= 'z') { if (capitalizeNext) { c += 'A' - 'a'; capitalizeNext = false; } b.append(c); } else if (c == ' ' || c == '\t') { throw new IllegalArgumentException("white space not allowed"); } else if (c == '-') { capitalizeNext = true; b.append(c); } else if (c == ',') { String s = b.toString(); if (s.length() > 0) l.add(s); b = new StringBuilder(); capitalizeNext = true; } else { capitalizeNext = false; b.append(c); } } String s = b.toString(); if (s.length() > 0) l.add(s); return l; } private void parseURI(String url) { int len = url.length(); int delim = url.indexOf(':'); if (delim == -1 || delim + 1 == len) { throw new IllegalArgumentException("invalid URL string"); } scheme = url.substring(0, delim).toLowerCase(); this.ssp = url.substring(delim + 1); if (!ssp.startsWith("//")) { if (!ssp.equals("*")) { throw new IllegalArgumentException("invalid URL string"); } this.authority = new Authority(scheme, "*"); return; } String authpath = ssp.substring(2); delim = authpath.indexOf('/'); String auth; if (delim == -1) { this.path = ""; auth = authpath; } else { auth = authpath.substring(0, delim); this.path = authpath.substring(delim); } this.authority = new Authority(scheme, auth.toLowerCase()); } private String actions() { StringBuilder b = new StringBuilder(); for (String s : methods) { b.append(s); } b.append(":"); for (String s : requestHeaders) { b.append(s); } return b.toString(); } /** * restore the state of this object from stream */ private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException { ObjectInputStream.GetField fields = s.readFields(); String actions = (String)fields.get("actions", null); init(actions); } static class Authority { HostPortrange p; Authority(String scheme, String authority) { int at = authority.indexOf('@'); if (at == -1) { p = new HostPortrange(scheme, authority); } else { p = new HostPortrange(scheme, authority.substring(at+1)); } } boolean implies(Authority other) { return impliesHostrange(other) && impliesPortrange(other); } private boolean impliesHostrange(Authority that) { String thishost = this.p.hostname(); String thathost = that.p.hostname(); if (p.wildcard() && thishost.equals("")) { // this "*" implies all others return true; } if (that.p.wildcard() && thathost.equals("")) { // that "*" can only be implied by this "*" return false; } if (thishost.equals(thathost)) { // covers all cases of literal IP addresses and fixed // domain names. return true; } if (this.p.wildcard()) { // this "*.foo.com" implies "bub.bar.foo.com" return thathost.endsWith(thishost); } return false; } private boolean impliesPortrange(Authority that) { int[] thisrange = this.p.portrange(); int[] thatrange = that.p.portrange(); if (thisrange[0] == -1) { /* port not specified non http/s URL */ return true; } return thisrange[0] <= thatrange[0] && thisrange[1] >= thatrange[1]; } boolean equals(Authority that) { return this.p.equals(that.p); } public int hashCode() { return p.hashCode(); } } }Other Java examples (source code examples)
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Java example source code file (URLPermission.java)
The URLPermission.java Java example source code/* * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.net; import java.io.ObjectInputStream; import java.io.IOException; import java.util.List; import java.util.ArrayList; import java.util.Collections; import java.security.Permission; /** * Represents permission to access a resource or set of resources defined by a * given url, and for a given set of user-settable request methods * and request headers. The <i>name of the permission is the url string. * The <i>actions string is a concatenation of the request methods and headers. * The range of method and header names is not restricted by this class. * <p>The url | Example url | Description | |||
|---|---|---|---|---|---|
| http://www.oracle.com/a/b/c.html | http://www.oracle.com/a/b/* | http://www.oracle.com/a/b/- | this's path | p's path | match |
| /a/b | /a/b | yes | |||
| /a/b/* | /a/b/c | yes | |||
| /a/b/* | /a/b/c/d | no | |||
| /a/b/- | /a/b/c/d | yes | |||
| /a/b/- | /a/b/c/d/e | yes | |||
| /a/b/- | /a/b/c/* | yes | |||
| /a/b/* | /a/b/c/- | no |
