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/target

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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4
[[package]]
name = "dotperms"
version = "0.1.0"

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[package]
name = "dotperms"
version = "0.1.0"
edition = "2024"
description = """
A simple library for LuckPerms-like authorization using permission nodes.
"""
authors = ["nm17"]
license = "MIT OR Apache-2.0"
readme = "README.md"
repository = "https://git.dc09.ru/nm17/dotperms"
homepage = "https://git.dc09.ru/nm17/dotperms"
keywords = ["permissions", "authorization", "acl", "auth"]
categories = ["security", "web-programming"]
[features]
default = ["dot-separator"]
dot-separator = []
colon-separator = []
[dependencies]

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# dotperms
An opinionated, but simple library for LuckPerms-like authorization using permission nodes.
## Rules of the algorithm.
- This function MUST NOT return a [`Result`].
All of it's behaviour in response to invalid permissions nodes MUST be deny-first.
Any invalid permissions MUST be ignored and any invalid requirements MUST be impossible to satisfy.
- Any given permission MUST allow any other requirements under the same jurisdiction.
- Any given permission with any amount of context should only allow requirements with the same context values.
- The "" permission node MUST NOT allow ANY requirements.
This is a conscious choice by the developer of the library in order
to prevent an accidentally placed empty string into the permissions of a user,
which will result in him getting access to everything in a given system.
- The "*" permission part MUST allow all requirements below itself, BUT the rules of context apply.
- The "" or "*" permission parts and anything that follows it MUST be cut off.
- Any permission part that contains "*", but is not exactly "*" MUST be considered empty.
From the LuckPerms Github Wiki:
> A permission is just a string, and is separated into parts using periods. For example, “minecraft.command.ban” is the permission for the /ban command. Obviously we don’t want all users to have access to this, so we only give it to users we trust.
>
> The string that represents a certain permission is also sometimes called a “permission node” or just “node” for short.
> Context in the most basic sense simply means the circumstances where something will apply.
>
> A single "context" consists of a key and a value, and are represented in the form key=value.

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#![doc = include_str!("../README.md")]
#![forbid(unsafe_code)]
#![forbid(missing_docs)]
#![allow(clippy::needless_return)]
use std::collections::HashMap;
#[cfg(feature = "dot-separator")]
const DEFAULT_SEPARATOR: &str = ".";
#[cfg(feature = "colon-separator")]
const DEFAULT_SEPARATOR: &str = ":";
#[cfg(not(any(feature = "dot-separator", feature = "colon-separator")))]
compile_error!(
"No default separator chosen! Please add a coresponding feature to the dotperms crate."
);
#[cfg(test)]
mod tests;
mod std_trait_impl;
#[allow(unused_imports)]
pub use crate::std_trait_impl::*;
/// A string that represents a certain permission.
///
/// Usually looks something like "minecraft.command.ban", but it can also use other separators beside dots.
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct PermNode<'a> {
inter: Vec<&'a str>,
divider: &'a str,
context: HashMap<String, String>,
}
impl<'a> PermNode<'a> {
/// Creates an empty PermNode.
pub fn new() -> Self {
return PermNode {
inter: Vec::new(),
context: HashMap::new(),
divider: DEFAULT_SEPARATOR,
};
}
/// Creates an empty PermNode, with a given divider
pub fn new_with_divider(divider: &'a str) -> Self {
return PermNode {
inter: Vec::new(),
context: HashMap::new(),
divider,
};
}
/// Push a permission node part.
pub fn push(&mut self, part: &'a str) {
if part == "*" && !self.inter.is_empty() {
return;
}
if part.is_empty() {
return;
}
self.inter.push(part);
}
/// Pop a permission node, if one remains, otherwise - [`None`].
pub fn pop(&mut self) -> Option<&'a str> {
self.inter.pop()
}
/// Set the permission node according to a given string and separator.
pub fn set(&mut self, perm_node_str: &'a str, divider: &str) {
self.inter.extend(PermNode::after_parse_logic(
perm_node_str.split(divider).collect(),
));
}
/// Convert a string like value into.
pub fn from_str(value: &'a str, divider: &'a str) -> Self {
PermNode {
inter: PermNode::after_parse_logic(value.split(divider).collect()),
context: HashMap::new(),
divider,
}
}
fn after_parse_logic(input: Vec<&'a str>) -> Vec<&'a str> {
// Invalidate any string that contain parts that contain "*" but are not exactly "*"
if input
.iter()
.any(|el| el.chars().count() > 1 && el.contains("*"))
{
return Vec::new();
}
for i in 0..input.len() {
if i == 0 && input[i] == "*" {
return vec!["*"];
}
if input[i] == "*" || input[i].is_empty() {
let mut new = Vec::with_capacity(i);
new.extend_from_slice(&input[..i]);
return new;
}
}
return input;
}
/// Check if the `requirement` allowed under this permission.
///
/// Consider ourselves to be a rule that a user has. `requirement` is the permission user must have.
/// Context is also taken into consideration.
///
/// ## Example
///
/// ```rust
/// use dotperms::PermNode;
///
/// let a: PermNode = "minecraft.cmd.ban".into();
/// let b: PermNode = "minecraft".into();
///
/// assert!(b.allows(&a));
/// assert!(!a.allows(&b));
/// ```
pub fn allows(&self, requirement: &PermNode) -> bool {
if self.inter.is_empty() {
return false;
}
let context_allowed: bool = 'c: {
for (context_item_key, context_item_value) in self.context.iter() {
let val = requirement.context.get(context_item_key);
if val.is_none() || val.is_some_and(|it| it != context_item_value) {
break 'c false;
}
}
break 'c true;
};
let perm_allowed: bool = 'c: {
let our_part = &self.inter;
let their_part = &requirement.inter;
if their_part.is_empty() {
return false;
}
if our_part.len() == 1 && our_part[0] == "*" {
return true;
}
// dbg!(&our_part, &their_part);
if their_part.starts_with(our_part) {
break 'c true;
}
break 'c false;
};
// dbg!(perm_allowed, context_allowed);
return perm_allowed && context_allowed;
}
/// Set a certain key to a value in the permission node's context.
pub fn set_ctx(mut self, key: impl Into<String>, value: impl Into<String>) -> Self {
self.context.insert(key.into(), value.into());
self
}
/// Get the value from the context by key.
pub fn get_ctx(&self, key: &str) -> Option<impl AsRef<str>> {
return self.context.get(key);
}
/// Get the iterator over keys and values of the Context.
pub fn ctx_iter(&self) -> impl Iterator<Item = (impl AsRef<str>, impl AsRef<str>)> {
return self.context.iter();
}
/// Get an iterator over parts of the permission node, starting from the very first all the way to the last one.
pub fn node_iter(&self) -> impl ExactSizeIterator<Item = impl AsRef<str>> {
return self.inter.iter();
}
/// Get the amount of parts in a permission node.
pub fn node_len(&self) -> usize {
return self.inter.len();
}
}
/// Checks if all requirements meet given permissions.
pub fn check_requirement<'a>(
requirements: impl Iterator<Item = &'a PermNode<'a>>,
permissions: impl Iterator<Item = &'a PermNode<'a>> + Clone,
) -> bool {
for requirement in requirements {
let mut at_least_one_allow = false;
for perm in permissions.clone() {
if perm.allows(requirement) {
at_least_one_allow = true;
}
}
if !at_least_one_allow {
return false;
}
}
return true;
}
/// Just a simple macro to create a [`PermNode`] from a string.
#[macro_export]
macro_rules! pn {
($val:expr) => {
PermNode::from($val)
};
}

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use crate::{DEFAULT_SEPARATOR, PermNode};
use std::{fmt::Display, hash::Hash};
impl Default for PermNode<'_> {
fn default() -> Self {
Self::new()
}
}
impl Hash for PermNode<'_> {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.inter.hash(state);
for (key, value) in self.context.iter() {
(key, value).hash(state);
}
}
}
impl Display for PermNode<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let result = self.inter.join(self.divider);
return result.fmt(f);
}
}
impl<'a> From<&'a str> for PermNode<'a> {
fn from(value: &'a str) -> Self {
PermNode::from_str(value, DEFAULT_SEPARATOR)
}
}

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use super::*;
#[test]
fn simple_checks() {
assert!(check_requirement(
[pn!("meili.index-name.read")].iter(),
[pn!("meili")].iter()
));
assert!(check_requirement(
[pn!("meili.index-name.read")].iter(),
[pn!("meili.index-name")].iter()
));
assert!(check_requirement(
[pn!("meili")].iter(),
[pn!("meili")].iter()
));
assert!(check_requirement(
[pn!("meili.asd")].iter(),
[pn!("meili.asd")].iter()
));
//assert!(check_requirement([pn!("")].iter(), [pn!("")].iter()));
// Should not be allowed
assert!(!check_requirement(
[pn!("meili.asd")].iter(),
[pn!("meili.bcd")].iter()
));
assert!(!check_requirement(
[pn!("meili.index-name2.read")].iter(),
[pn!("meili.index-name")].iter()
));
assert!(!check_requirement(
[pn!("meili")].iter(),
[pn!("meili.bcd")].iter()
));
// assert!(!check_requirement([pn!("")].iter(), [pn!("meili")].iter()));
}
#[test]
fn context_works() {
assert!(check_requirement(
[pn!("meili").set_ctx("server", "home")].iter(),
[pn!("meili")].iter()
));
assert!(check_requirement(
[pn!("meili").set_ctx("server", "home")].iter(),
[pn!("meili").set_ctx("server", "home")].iter()
));
assert!(!check_requirement(
[pn!("meili")].iter(),
[pn!("meili").set_ctx("server", "home")].iter()
));
assert!(!check_requirement(
[pn!("meili").set_ctx("server", "prod")].iter(),
[pn!("meili").set_ctx("server", "home")].iter()
));
}
#[test]
fn multiple_requirements() {
assert!(check_requirement(
[pn!("meili"), pn!("otherstuff")].iter(),
[pn!("otherstuff"), pn!("meili")].iter()
));
assert!(!check_requirement(
[pn!("meili"), pn!("otherstuff")].iter(),
[pn!("meili")].iter()
));
}
#[test]
fn test_traits() {
assert!(format!("{}", pn!("test.of.traits")) == "test.of.traits");
assert!(format!("{}", pn!("test.of.*")) == "test.of");
assert!(format!("{}", pn!("test.of.")) == "test.of");
}
#[test]
fn test_star_and_empty_rules() {
assert!(!check_requirement([pn!("")].iter(), [pn!("*")].iter()));
assert!(check_requirement(
[pn!("asdasdasd"), pn!("qweqwe"), pn!("fghfgh"),].iter(),
[pn!("*")].iter()
));
let mut pn = pn!("");
pn.push("");
assert!(!check_requirement([pn].iter(), [pn!("*")].iter()));
// star double push test
let mut pn = pn!("");
pn.push("*");
assert!(check_requirement([pn.clone()].iter(), [pn!("*")].iter()));
let mut pn_c = pn.clone();
pn_c.push("*");
assert_eq!(pn, pn_c);
}