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Configure permissionEvaluator and roleHierarchy by default

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Implementations of AbstractSecurityExpressionHandler (such as the very commonly used DefaultWebSecurityExpressionHandler) get PermissionEvaluator and RoleHierarchy from the application context (if the application context is provided, and exactly one of such a bean exists in it). This approach matches that used in GlobalMethodSecurityConfiguration, making everything in Spring Security work the same way (including WebSecurity).

Issue gh-4077
This commit is contained in:
Craig Andrews
2016-11-01 16:35:01 -04:00
committed by Rob Winch
parent 3f58822d4d
commit 3bf6bf10de
2 changed files with 152 additions and 0 deletions
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core/src/main/java/org/springframework/security/access/expression/AbstractSecurityExpressionHandler.java
+33
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@@ -40,8 +40,12 @@ public abstract class AbstractSecurityExpressionHandler<T> implements
SecurityExpressionHandler<T>, ApplicationContextAware {
private ExpressionParser expressionParser = new SpelExpressionParser();
private BeanResolver br;
private ApplicationContext context;
private RoleHierarchy roleHierarchy;
private PermissionEvaluator permissionEvaluator = new DenyAllPermissionEvaluator();
private boolean roleHierarchySet = false;
private boolean permissionEvaluatorSet = false;
public final ExpressionParser getExpressionParser() {
return expressionParser;
@@ -101,23 +105,52 @@ public abstract class AbstractSecurityExpressionHandler<T> implements
protected abstract SecurityExpressionOperations createSecurityExpressionRoot(
Authentication authentication, T invocation);
private boolean roleHerarchyNotSetForValidContext() {
return ! roleHierarchySet && context != null;
}
protected RoleHierarchy getRoleHierarchy() {
if(roleHerarchyNotSetForValidContext()) {
RoleHierarchy contextRoleHierarchy = getSingleBeanOrNull(RoleHierarchy.class);
if(contextRoleHierarchy != null){
roleHierarchy = contextRoleHierarchy;
}
roleHierarchySet = true;
}
return roleHierarchy;
}
public void setRoleHierarchy(RoleHierarchy roleHierarchy) {
roleHierarchySet = true;
this.roleHierarchy = roleHierarchy;
}
protected PermissionEvaluator getPermissionEvaluator() {
if(! permissionEvaluatorSet && context != null) {
PermissionEvaluator contextPermissionEvaluator = getSingleBeanOrNull(PermissionEvaluator.class);
if(contextPermissionEvaluator != null){
permissionEvaluator = contextPermissionEvaluator;
}
permissionEvaluatorSet = true;
}
return permissionEvaluator;
}
public void setPermissionEvaluator(PermissionEvaluator permissionEvaluator) {
permissionEvaluatorSet = true;
this.permissionEvaluator = permissionEvaluator;
}
public void setApplicationContext(ApplicationContext applicationContext) {
br = new BeanFactoryResolver(applicationContext);
this.context = applicationContext;
}
private <T> T getSingleBeanOrNull(Class<T> type) {
String[] beanNamesForType = context.getBeanNamesForType(type);
if (beanNamesForType == null || beanNamesForType.length != 1) {
return null;
}
return context.getBean(beanNamesForType[0], type);
}
}