How to create custom web security expression to us

2019-08-17 08:08发布

站内问答 / Java
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How is it possible to create your own web security expression, so that I'll be able to use it in JSP file like:

<sec:authorize access="isOwner()"> some content here </sec:authorize>

2条回答
Fickle 薄情
2楼-- · 2019-08-17 08:37

Here is what you need. Follow below to create custom SpEL expression:

1) Create custom subclass of WebSecurityExpressionRoot class. In this subclass create a new method which you will use in expression. For example:

public class CustomWebSecurityExpressionRoot extends WebSecurityExpressionRoot {

    public CustomWebSecurityExpressionRoot(Authentication a, FilterInvocation fi) {
        super(a, fi);
    }

    public boolean yourCustomMethod() {
        boolean calculatedValue = ...;

        return calculatedValue;

    }
}

2) Create custom subclass of DefaultWebSecurityExpressionHandler class and override method createSecurityExpressionRoot(Authentication authentication, FilterInvocation fi) (not createEvaluationContext(...)) in it to return your CustomWebSecurityExpressionRoot instance. For example:

@Component(value="customExpressionHandler")
public class CustomWebSecurityExpressionHandler extends DefaultWebSecurityExpressionHandler {

    @Override
    protected SecurityExpressionRoot createSecurityExpressionRoot(
            Authentication authentication, FilterInvocation fi) {

        WebSecurityExpressionRoot expressionRoot = new CustomWebSecurityExpressionRoot(authentication, fi);

        return expressionRoot;
}}

3) Define in your spring-security.xml the reference to your expression handler bean

<security:http access-denied-page="/error403.jsp" use-expressions="true" auto-config="false">
    ...

    <security:expression-handler ref="customExpressionHandler"/>
</security:http>

After this, you can use your own custom expression instead of the standard one:

<security:authorize access="yourCustomMethod()">
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等我变得足够好
3楼-- · 2019-08-17 08:47

I suggest you using Shiro framework.
Official Link:http://shiro.apache.org/
Implement AuthorizingRealm with extends, then add the expression of security control in the doGetAuthorizationInfo(...).
In the JSP, first add Shiro JSP tag library, official link :http://shiro.apache.org/web.html#Web-taglibrary

Using <shiro:hasPermission name="...">...</shiro:hasPermission> can control the things you need. name property is the expression which will compare with what you set in AuthorizingRealm.

Here is permission expression guide :http://shiro.apache.org/permissions.html

Here is some usage:

<%@ taglib prefix="shiro" uri=http://shiro.apache.org/tags %>
<html>
<body>
    <shiro:hasPermission name="users:manage">
        <a href="manageUsers.jsp">
            Click here to manage users
        </a>
    </shiro:hasPermission>
    <shiro:lacksPermission name="users:manage">
        No user management for you!
    </shiro:lacksPermission>
</body>
</html>
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