119 lines
4.1 KiB
Java
119 lines
4.1 KiB
Java
/*
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* Copyright (C) 2022 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson.internal;
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import java.lang.reflect.AccessibleObject;
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import java.lang.reflect.Method;
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import java.util.List;
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import com.google.gson.ReflectionAccessFilter;
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import com.google.gson.ReflectionAccessFilter.FilterResult;
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/**
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* Internal helper class for {@link ReflectionAccessFilter}.
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*/
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public class ReflectionAccessFilterHelper {
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private ReflectionAccessFilterHelper() { }
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// Platform type detection is based on Moshi's Util.isPlatformType(Class)
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// See https://github.com/square/moshi/blob/3c108919ee1cce88a433ffda04eeeddc0341eae7/moshi/src/main/java/com/squareup/moshi/internal/Util.java#L141
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public static boolean isJavaType(Class<?> c) {
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return isJavaType(c.getName());
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}
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private static boolean isJavaType(String className) {
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return className.startsWith("java.") || className.startsWith("javax.");
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}
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public static boolean isAndroidType(Class<?> c) {
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return isAndroidType(c.getName());
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}
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private static boolean isAndroidType(String className) {
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return className.startsWith("android.")
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|| className.startsWith("androidx.")
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|| isJavaType(className);
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}
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public static boolean isAnyPlatformType(Class<?> c) {
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String className = c.getName();
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return isAndroidType(className) // Covers Android and Java
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|| className.startsWith("kotlin.")
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|| className.startsWith("kotlinx.")
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|| className.startsWith("scala.");
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}
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/**
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* Gets the result of applying all filters until the first one returns a result
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* other than {@link FilterResult#INDECISIVE}, or {@link FilterResult#ALLOW} if
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* the list of filters is empty or all returned {@code INDECISIVE}.
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*/
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public static FilterResult getFilterResult(List<ReflectionAccessFilter> reflectionFilters, Class<?> c) {
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for (ReflectionAccessFilter filter : reflectionFilters) {
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FilterResult result = filter.check(c);
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if (result != FilterResult.INDECISIVE) {
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return result;
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}
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}
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return FilterResult.ALLOW;
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}
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/**
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* See {@link AccessibleObject#canAccess(Object)} (Java >= 9)
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*/
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public static boolean canAccess(AccessibleObject accessibleObject, Object object) {
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return AccessChecker.INSTANCE.canAccess(accessibleObject, object);
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}
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private static abstract class AccessChecker {
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public static final AccessChecker INSTANCE;
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static {
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AccessChecker accessChecker = null;
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// TODO: Ideally should use Multi-Release JAR for this version specific code
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if (JavaVersion.isJava9OrLater()) {
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try {
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final Method canAccessMethod = AccessibleObject.class.getDeclaredMethod("canAccess", Object.class);
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accessChecker = new AccessChecker() {
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@Override public boolean canAccess(AccessibleObject accessibleObject, Object object) {
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try {
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return (Boolean) canAccessMethod.invoke(accessibleObject, object);
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} catch (Exception e) {
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throw new RuntimeException("Failed invoking canAccess", e);
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}
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}
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};
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} catch (NoSuchMethodException ignored) {
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// OK: will assume everything is accessible
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}
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}
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if (accessChecker == null) {
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accessChecker = new AccessChecker() {
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@Override public boolean canAccess(AccessibleObject accessibleObject, Object object) {
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// Cannot determine whether object can be accessed, so assume it can be accessed
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return true;
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}
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};
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}
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INSTANCE = accessChecker;
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}
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public abstract boolean canAccess(AccessibleObject accessibleObject, Object object);
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}
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}
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