在Spring Security中与hasPermission一起使用时，权限参数是否区分大小写？

Question

Do the below two lines behave the same way?

@PreAuthorize("hasPermission(#task, 'MANAGER')

@PreAuthorize("hasPermission(#task, 'manager')

Also, the permission constant is defined as below in the CustomPermission.java

 public static final Permission MANAGER    = new CustomPermission(1<<7,'M');

Answer 1

Is the permission parameter case-sensitive? Well, yes and no. If the permission is an uppercase String and you input a lowercase permission, it will work. The opposite won't, though.

I checked Spring's source code. AclPermissionEvaluator is the default implementation of PermissionEvaluator , which is the interface that handles the hasPermission() routine. It tries to find the permission from the original given String first. If it doesn't find it, it tries again calling toUpperCase() .

See it for yourself:

if (permission instanceof String) {
    String permString = (String) permission;
    Permission p;

    try {
        p = permissionFactory.buildFromName(permString);
    }
    catch (IllegalArgumentException notfound) {
        p = permissionFactory.buildFromName(permString.toUpperCase());
    }

    if (p != null) {
        return Arrays.asList(p);
    }

}

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Reference:

https://github.com/spring-projects/spring-security/blob/7b4a37f27e4ba7045bd63656e49ee0d5ee381ce5/acl/src/main/java/org/springframework/security/acls/AclPermissionEvaluator.java