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#1016 in Rust patterns
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Used in suchbar
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Permeable
Permeable is a permission-demand trait. It helps to decouple the permission-demander from the permission / auth provider.
Our goal was the simplest possible trait to ask for permission. Can be implemented by a permission-provider distinguishing between users.
Example
use permeable::{Permeable, PermissionError};
const RO_THIS: &str = "RoThis";
const RW_THIS: &str = "RwThis";
const ACCESS_THAT: &str = "AccessThat";
struct User {
name: String,
};
// A naive implementation of a the Permeable-Trait.
impl Permeable for User {
fn has_perm(&self, permission: &str) -> Result<(), PermissionError> {
match (self.name.as_str(), permission) {
("admin", _) => Ok(()),
("peter", ACCESS_THAT) => Ok(()),
("peter", RO_THIS) => Ok(()),
("paul", RO_THIS) => Ok(()),
("paul", RW_THIS) => Ok(()),
// catch all
(_, perm) => Err(PermissionError::denied(permission, &self.name)),
}
}
}
fn main() {
let admin = User { name: String::from("admin") };
assert_eq!(admin.has_perm(RW_THIS), Ok(()));
let peter = User { name: String::from("peter") };
assert_eq!(peter.has_perm(ACCESS_THAT), Ok(()));
assert_eq!(peter.has_perm(RW_THIS).is_err(), true);
}