1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

use crate::core::Request;

/// Trait to extend `Policy` engine core resource matching.
pub trait ResourceMatcher {
    /// The type of the context associated with the request.
    type Context;

    /// This method is being called by `Policy` when it tries to match a `Request` to
    /// a resource in the policy rules.
    fn do_match(&self, context: &Request<Self::Context>, input: &str, policy: &str) -> bool;
}

/// Default matcher uses equality check for resource matching.
#[derive(Debug)]
pub struct Default;

impl ResourceMatcher for Default {
    type Context = ();

    fn do_match(&self, _context: &Request<Self::Context>, input: &str, policy: &str) -> bool {
        input == policy
    }
}

/// Resource matcher that uses "star-with" check for resource matching.
/// Input matches the policy if input value starts with policy value.
#[derive(Debug)]
pub struct StartsWith;

impl ResourceMatcher for StartsWith {
    type Context = ();

    fn do_match(&self, _context: &Request<Self::Context>, input: &str, policy: &str) -> bool {
        input.starts_with(policy)
    }
}