1 /*

     2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 package p1;

    25 

    26 import java.lang.invoke.MethodHandle;

    27 import java.lang.invoke.MethodHandles;

    28 import java.lang.invoke.MethodHandles.Lookup;

    29 import java.lang.invoke.MethodType;

    30 

    31 /**

    32  * Basic test case for module access check, supplements AccessControlTest.

    33  *

    34  * The tests consists of two modules:

    35  *

    36  * module m1 { requires m2; exports p1; }

    37  * module m2 { exports q1; }

    38  *

    39  * Both modules read java.base (as every module reads java.base)

    40  *

    41  * module m1 has public types in packages p1 and p2, p2 is not exported.

    42  * module m2 has public types in packages q1 and q2, q2 is not exported.

    43  */

    44 

    45 public class Main {

    46 

    47     static final int MODULE = Lookup.MODULE;

    48 

    49     // Use Class.forName to get classes for test because some

    50     // are not accessible at compile-time

    51 

    52     static final Class<?> p1_Type1;        // m1, exported

    53     static final Class<?> p2_Type2;        // m1, not exported

    54     static final Class<?> q1_Type1;        // m2, exported, m1 reads m2

    55     static final Class<?> q2_Type2;        // m2, not exported, m1 reads m2

    56     static final Class<?> x500NameClass;   // java.base, not exported

    57 

    58     static {

    59         try {

    60             p1_Type1 = Class.forName("p1.Type1");

    61             p2_Type2 = Class.forName("p2.Type2");

    62             q1_Type1 = Class.forName("q1.Type1");

    63             q2_Type2 = Class.forName("q2.Type2");

    64             x500NameClass = Class.forName("sun.security.x509.X500Name");

    65         } catch (ClassNotFoundException e) {

    66             throw new AssertionError(e);

    67         }

    68     }

    69 

    70     public static void main(String[] args) throws Exception {

    71         Lookup lookup, lookup2;

    72 

    73         /**

    74          * MethodHandles.lookup()

    75          * has module access [A0]

    76          * can access all public types in m1 [A1]

    77          * can access public types in packages exported by modules that m1 reads [A2]

    78          * cannot access public types in non-exported modules of modules that m1 reads [A3]

    79          */

    80         lookup = MethodHandles.lookup();

    81         assertTrue((lookup.lookupModes() & MODULE) == MODULE); // [A0]

    82         findConstructor(lookup, p1_Type1, void.class); // [A1]

    83         findConstructor(lookup, p2_Type2, void.class); // [A1]

    84         findConstructor(lookup, q1_Type1, void.class); // [A2]

    85         findConstructorExpectingIAE(lookup, q2_Type2, void.class); // [A3]

    86         findConstructor(lookup, Object.class, void.class); // [A2]

    87         findConstructorExpectingIAE(lookup, x500NameClass, void.class, String.class); // [A3]

    88 

    89         /**

    90          * Teleport from MethodHandles.lookup() to lookup class in the same module

    91          * module access is retained [A0]

    92          * can access all public types in m1 [A1]

    93          * can access public types in packages exported by modules that m1 reads [A2]

    94          * cannot access public types in non-exported modules of modules that m1 reads [A3]

    95          */

    96         lookup2 = lookup.in(p2_Type2);

    97         assertTrue((lookup2.lookupModes() & MODULE) == MODULE); // [A0]

    98         findConstructor(lookup2, p1_Type1, void.class); // [A1]

    99         findConstructor(lookup2, p2_Type2, void.class); // [A1]

   100         findConstructor(lookup2, q1_Type1, void.class); // [A2]

   101         findConstructorExpectingIAE(lookup2, q2_Type2, void.class); // [A3]

   102         findConstructor(lookup2, Object.class, void.class); // [A2]

   103         findConstructorExpectingIAE(lookup2, x500NameClass, void.class, String.class); // [A3]

   104 

   105         /**

   106          * Teleport from MethodHandles.lookup() to lookup class in another named module

   107          * has no access [A0]

   108          */

   109         lookup2 = lookup.in(Object.class);

   110         assertTrue(lookup2.lookupModes() == 0); // [A0]

   111         findConstructorExpectingIAE(lookup2, Object.class, void.class);  // [A0]

   112 

   113         /**

   114          * Teleport from MethodHandles.lookup() to lookup class in an unnamed module

   115          * has no access [A0]

   116          */

   117         Class<?> c = MethodHandles.publicLookup().lookupClass();

   118         assertTrue(!c.getModule().isNamed());

   119         lookup2 = lookup.in(c);

   120         assertTrue(lookup2.lookupModes() == 0); // [A0]

   121         findConstructorExpectingIAE(lookup2, Object.class, void.class);

   122 

   123         /**

   124          * MethodHandles.publicLookup()

   125          * has no module access [A0]

   126          * can access public types in exported packages [A1]

   127          * cannot access public types in non-exported packages [A2]

   128          */

   129         lookup = MethodHandles.publicLookup();

   130         assertTrue((lookup.lookupModes() & MODULE) == 0); // [A0]

   131         findConstructor(lookup, p1_Type1, void.class); // [A1]

   132         findConstructorExpectingIAE(lookup, p2_Type2, void.class); // [A1]

   133         findConstructor(lookup, q1_Type1, void.class); // [A1]

   134         findConstructorExpectingIAE(lookup, q2_Type2, void.class); // [A2]

   135         findConstructor(lookup, Object.class, void.class); // [A1]

   136         findConstructorExpectingIAE(lookup, x500NameClass, void.class); // [A2]

   137 

   138         /**

   139          * Teleport from MethodHandles.publicLookup() to lookup class in java.base

   140          * has no module access [A0]

   141          * can access public types in packages exported by java.base [A1]

   142          * cannot access public types in non-exported packages [A2]

   143          * no access to types in other named modules [A3]

   144          */

   145         lookup2 = lookup.in(Object.class);

   146         assertTrue((lookup2.lookupModes() & MODULE) == 0); // [A0]

   147         findConstructor(lookup2, String.class, void.class); // [A1]

   148         findConstructorExpectingIAE(lookup2, x500NameClass, void.class, String.class); // [A2]

   149         findConstructorExpectingIAE(lookup2, p1_Type1, void.class); // [A3]

   150         findConstructorExpectingIAE(lookup2, q1_Type1, void.class); // [A3]

   151 

   152         /**

   153          * Teleport from MethodHandles.publicLookup() to lookup class in m1

   154          * has no module access [A0]

   155          * can access public types in packages exported by m1, m2 and java.base [A1]

   156          * cannot access public types is non-exported packages [A2]

   157          */

   158         lookup2 = lookup.in(p1_Type1);

   159         assertTrue((lookup2.lookupModes() & MODULE) == 0); // [A0]

   160         findConstructor(lookup2, p1_Type1, void.class);  // [A1]

   161         findConstructor(lookup2, q1_Type1, void.class);  // [A1]

   162         findConstructor(lookup2, Object.class, void.class);  // [A1]

   163         findConstructorExpectingIAE(lookup, p2_Type2, void.class); // [A2]

   164         findConstructorExpectingIAE(lookup, q2_Type2, void.class); // [A2]

   165         findConstructorExpectingIAE(lookup2, x500NameClass, void.class, String.class); // [A2]

   166 

   167         /**

   168          * Teleport from MethodHandles.publicLookup() to lookup class in m2

   169          * has no module access [A0]

   170          * can access public types in packages exported by m2 and java.base [A1]

   171          * cannot access public types is non-exported packages or modules that m2 does

   172          *   not read [A2]

   173          */

   174         lookup2 = lookup.in(q1_Type1);

   175         assertTrue((lookup2.lookupModes() & MODULE) == 0); // [A0]

   176         findConstructor(lookup2, q1_Type1, void.class); // [A1]

   177         findConstructor(lookup2, Object.class, void.class); // [A1]

   178         findConstructorExpectingIAE(lookup2, p1_Type1, void.class); // [A2]

   179         findConstructorExpectingIAE(lookup, q2_Type2, void.class); // [A2]

   180         findConstructorExpectingIAE(lookup2, x500NameClass, void.class, String.class);  // [A2]

   181 

   182         /**

   183          * Teleport from MethodHandles.publicLookup() to lookup class that is not

   184          * in an exported package, should get no access [A0]

   185          */

   186         lookup2 = lookup.in(p2_Type2);

   187         assertTrue(lookup2.lookupModes()  == 0); // [A0]

   188         findConstructorExpectingIAE(lookup, q2_Type2, void.class); // [A0]

   189     }

   190 

   191     /**

   192      * Invokes Lookup findConstructor with a method type constructored from the

   193      * given return and parameter types, expecting IllegalAccessException to be

   194      * thrown.

   195      */

   196     static MethodHandle findConstructorExpectingIAE(Lookup lookup,

   197                                                     Class<?> clazz,

   198                                                     Class<?> rtype,

   199                                                     Class<?>... ptypes) throws Exception {

   200         try {

   201             findConstructor(lookup, clazz, rtype, ptypes);

   202             throw new RuntimeException("IllegalAccessError expected");

   203         } catch (IllegalAccessException expected) {

   204             return null;

   205         }

   206     }

   207 

   208     /**

   209      * Invokes Lookup findConstructor with a method type constructored from the

   210      * given return and parameter types.

   211      */

   212     static MethodHandle findConstructor(Lookup lookup,

   213                                         Class<?> clazz,

   214                                         Class<?> rtype,

   215                                         Class<?>... ptypes) throws Exception {

   216         MethodType mt = MethodType.methodType(rtype, ptypes);

   217         return lookup.findConstructor(clazz, mt);

   218     }

   219 

   220     static void assertTrue(boolean condition) {

   221         if (!condition)

   222             throw new RuntimeException();

   223     }

   224 

   225 }