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147 lines
4.8 KiB
Rust
147 lines
4.8 KiB
Rust
/*
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* Copyright (c) 2020-2023, Stalwart Labs Ltd.
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*
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* This file is part of the Stalwart Sieve Interpreter.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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* in the LICENSE file at the top-level directory of this distribution.
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* You can be released from the requirements of the AGPLv3 license by
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* purchasing a commercial license. Please contact licensing@stalw.art
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* for more details.
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*/
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use std::borrow::Cow;
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use crate::sieve::{
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compiler::{
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grammar::{Comparator, RelationalMatch},
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Value,
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},
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runtime::Variable,
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MatchAs,
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};
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use super::glob::{glob_match, glob_match_capture};
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impl Comparator {
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pub(crate) fn is(&self, a: &Variable<'_>, b: &Variable<'_>) -> bool {
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match self {
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Comparator::Octet => a.to_cow() == b.to_cow(),
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Comparator::AsciiNumeric => RelationalMatch::Eq.cmp(&a.to_number(), &b.to_number()),
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_ => a.to_cow().to_lowercase() == b.to_cow().to_lowercase(),
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}
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}
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pub(crate) fn contains(&self, haystack: &str, needle: &str) -> bool {
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needle.is_empty()
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|| match self {
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Comparator::Octet => haystack.contains(needle),
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_ => haystack.to_lowercase().contains(&needle.to_lowercase()),
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}
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}
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pub(crate) fn relational(
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&self,
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relation: &RelationalMatch,
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a: &Variable<'_>,
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b: &Variable<'_>,
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) -> bool {
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match self {
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Comparator::Octet => relation.cmp(a.to_cow().as_ref(), b.to_cow().as_ref()),
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Comparator::AsciiNumeric => relation.cmp(&a.to_number(), &b.to_number()),
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_ => relation.cmp(&a.to_cow().to_lowercase(), &b.to_cow().to_lowercase()),
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}
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}
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pub(crate) fn matches(
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&self,
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value: &str,
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pattern: &str,
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capture_positions: u64,
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captured_values: &mut Vec<(usize, String)>,
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) -> bool {
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match self {
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Comparator::AsciiCaseMap if capture_positions == 0 => {
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glob_match(&value.to_lowercase(), pattern, true)
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}
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Comparator::AsciiCaseMap => {
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glob_match_capture(value, pattern, true, capture_positions, captured_values)
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}
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_ if capture_positions == 0 => glob_match(value, pattern, false),
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_ => glob_match_capture(value, pattern, false, capture_positions, captured_values),
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}
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}
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pub(crate) fn regex(
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&self,
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pattern: &Value,
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pattern_expr: &Variable<'_>,
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value: &str,
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mut capture_positions: u64,
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captured_values: &mut Vec<(usize, String)>,
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) -> bool {
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let regex = if let Value::Regex(regex) = pattern {
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Cow::Borrowed(®ex.regex)
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} else {
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match fancy_regex::Regex::new(pattern_expr.to_cow().as_ref()) {
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Ok(regex) => Cow::Owned(regex),
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Err(err) => {
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debug_assert!(false, "Failed to compile regex: {err:?}");
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return false;
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}
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}
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};
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if capture_positions == 0 {
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regex.is_match(value).unwrap_or_default()
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} else if let Ok(Some(captures)) = regex.captures(value) {
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captured_values.clear();
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while capture_positions != 0 {
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let index = 63 - capture_positions.leading_zeros();
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capture_positions ^= 1 << index;
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if let Some(match_var) = captures.get(index as usize) {
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captured_values.push((index as usize, match_var.as_str().to_string()));
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}
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}
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true
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} else {
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false
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}
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}
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pub(crate) fn as_match(&self) -> MatchAs {
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match self {
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Comparator::AsciiCaseMap => MatchAs::Lowercase,
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Comparator::AsciiNumeric => MatchAs::Number,
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_ => MatchAs::Octet,
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}
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}
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}
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impl RelationalMatch {
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pub fn cmp<T>(&self, a: &T, b: &T) -> bool
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where
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T: PartialOrd + ?Sized,
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{
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match self {
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RelationalMatch::Gt => a.gt(b),
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RelationalMatch::Ge => a.ge(b),
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RelationalMatch::Lt => a.lt(b),
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RelationalMatch::Le => a.le(b),
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RelationalMatch::Eq => a.eq(b),
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RelationalMatch::Ne => a.ne(b),
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}
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}
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}
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