147 lines
4 KiB
Rust
147 lines
4 KiB
Rust
use crate::decision::Decision;
|
|
use crate::error::Error;
|
|
use crate::error::Result;
|
|
use serde::Deserialize;
|
|
use serde::Serialize;
|
|
use shlex::try_join;
|
|
use std::any::Any;
|
|
use std::fmt::Debug;
|
|
use std::sync::Arc;
|
|
|
|
/// Matches a single command token, either a fixed string or one of several allowed alternatives.
|
|
#[derive(Clone, Debug, Eq, PartialEq)]
|
|
pub enum PatternToken {
|
|
Single(String),
|
|
Alts(Vec<String>),
|
|
}
|
|
|
|
impl PatternToken {
|
|
fn matches(&self, token: &str) -> bool {
|
|
match self {
|
|
Self::Single(expected) => expected == token,
|
|
Self::Alts(alternatives) => alternatives.iter().any(|alt| alt == token),
|
|
}
|
|
}
|
|
|
|
pub fn alternatives(&self) -> &[String] {
|
|
match self {
|
|
Self::Single(expected) => std::slice::from_ref(expected),
|
|
Self::Alts(alternatives) => alternatives,
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Prefix matcher for commands with support for alternative match tokens.
|
|
/// First token is fixed since we key by the first token in policy.
|
|
#[derive(Clone, Debug, Eq, PartialEq)]
|
|
pub struct PrefixPattern {
|
|
pub first: Arc<str>,
|
|
pub rest: Arc<[PatternToken]>,
|
|
}
|
|
|
|
impl PrefixPattern {
|
|
pub fn matches_prefix(&self, cmd: &[String]) -> Option<Vec<String>> {
|
|
let pattern_length = self.rest.len() + 1;
|
|
if cmd.len() < pattern_length || cmd[0] != self.first.as_ref() {
|
|
return None;
|
|
}
|
|
|
|
for (pattern_token, cmd_token) in self.rest.iter().zip(&cmd[1..pattern_length]) {
|
|
if !pattern_token.matches(cmd_token) {
|
|
return None;
|
|
}
|
|
}
|
|
|
|
Some(cmd[..pattern_length].to_vec())
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)]
|
|
#[serde(rename_all = "camelCase")]
|
|
pub enum RuleMatch {
|
|
PrefixRuleMatch {
|
|
#[serde(rename = "matchedPrefix")]
|
|
matched_prefix: Vec<String>,
|
|
decision: Decision,
|
|
},
|
|
}
|
|
|
|
impl RuleMatch {
|
|
pub fn decision(&self) -> Decision {
|
|
match self {
|
|
Self::PrefixRuleMatch { decision, .. } => *decision,
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Debug, Eq, PartialEq)]
|
|
pub struct PrefixRule {
|
|
pub pattern: PrefixPattern,
|
|
pub decision: Decision,
|
|
}
|
|
|
|
pub trait Rule: Any + Debug + Send + Sync {
|
|
fn program(&self) -> &str;
|
|
|
|
fn matches(&self, cmd: &[String]) -> Option<RuleMatch>;
|
|
}
|
|
|
|
pub type RuleRef = Arc<dyn Rule>;
|
|
|
|
impl Rule for PrefixRule {
|
|
fn program(&self) -> &str {
|
|
self.pattern.first.as_ref()
|
|
}
|
|
|
|
fn matches(&self, cmd: &[String]) -> Option<RuleMatch> {
|
|
self.pattern
|
|
.matches_prefix(cmd)
|
|
.map(|matched_prefix| RuleMatch::PrefixRuleMatch {
|
|
matched_prefix,
|
|
decision: self.decision,
|
|
})
|
|
}
|
|
}
|
|
|
|
/// Count how many rules match each provided example and error if any example is unmatched.
|
|
pub(crate) fn validate_match_examples(rules: &[RuleRef], matches: &[Vec<String>]) -> Result<()> {
|
|
let mut unmatched_examples = Vec::new();
|
|
|
|
for example in matches {
|
|
if rules.iter().any(|rule| rule.matches(example).is_some()) {
|
|
continue;
|
|
}
|
|
|
|
unmatched_examples.push(
|
|
try_join(example.iter().map(String::as_str))
|
|
.unwrap_or_else(|_| "unable to render example".to_string()),
|
|
);
|
|
}
|
|
|
|
if unmatched_examples.is_empty() {
|
|
Ok(())
|
|
} else {
|
|
Err(Error::ExampleDidNotMatch {
|
|
rules: rules.iter().map(|rule| format!("{rule:?}")).collect(),
|
|
examples: unmatched_examples,
|
|
})
|
|
}
|
|
}
|
|
|
|
/// Ensure that no rule matches any provided negative example.
|
|
pub(crate) fn validate_not_match_examples(
|
|
rules: &[RuleRef],
|
|
not_matches: &[Vec<String>],
|
|
) -> Result<()> {
|
|
for example in not_matches {
|
|
if let Some(rule) = rules.iter().find(|rule| rule.matches(example).is_some()) {
|
|
return Err(Error::ExampleDidMatch {
|
|
rule: format!("{rule:?}"),
|
|
example: try_join(example.iter().map(String::as_str))
|
|
.unwrap_or_else(|_| "unable to render example".to_string()),
|
|
});
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
}
|