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380 lines
15 KiB
Rust
380 lines
15 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 mail_parser::{parsers::MessageStream, Header, HeaderName, HeaderValue};
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use crate::sieve::{
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compiler::{
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grammar::{actions::action_mime::MimeOpts, tests::test_header::TestHeader, MatchType},
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Number, Value,
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},
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runtime::Variable,
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Context, Event,
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};
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use super::{mime::SubpartIterator, TestResult};
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impl TestHeader {
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pub(crate) fn exec(&self, ctx: &mut Context) -> TestResult {
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let key_list = ctx.eval_values(&self.key_list);
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let header_list = ctx.parse_header_names(&self.header_list);
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let mime_opts = match &self.mime_opts {
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MimeOpts::Type => MimeOpts::Type,
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MimeOpts::Subtype => MimeOpts::Subtype,
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MimeOpts::ContentType => MimeOpts::ContentType,
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MimeOpts::Param(params) => MimeOpts::Param(ctx.eval_values(params)),
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MimeOpts::None => MimeOpts::None,
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};
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let result = match &self.match_type {
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MatchType::Is | MatchType::Contains => {
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let is_is = matches!(&self.match_type, MatchType::Is);
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ctx.find_headers(
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&header_list,
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self.index,
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self.mime_anychild,
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|header, _, _| {
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ctx.find_header_values(header, &mime_opts, |value| {
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for key in &key_list {
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if is_is {
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if self.comparator.is(&Variable::from(value), key) {
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return true;
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}
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} else if self.comparator.contains(value, key.to_cow().as_ref()) {
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return true;
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}
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}
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false
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})
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},
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)
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}
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MatchType::Value(rel_match) => ctx.find_headers(
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&header_list,
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self.index,
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self.mime_anychild,
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|header, _, _| {
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ctx.find_header_values(header, &mime_opts, |value| {
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for key in &key_list {
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if self
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.comparator
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.relational(rel_match, &Variable::from(value), key)
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{
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return true;
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}
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}
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false
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})
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},
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),
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MatchType::Matches(capture_positions) | MatchType::Regex(capture_positions) => {
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let mut captured_values = Vec::new();
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let is_matches = matches!(&self.match_type, MatchType::Matches(_));
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let result = ctx.find_headers(
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&header_list,
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self.index,
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self.mime_anychild,
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|header, _, _| {
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ctx.find_header_values(header, &mime_opts, |value| {
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for (pattern_expr, pattern) in key_list.iter().zip(self.key_list.iter())
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{
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if is_matches {
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if self.comparator.matches(
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value,
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pattern_expr.to_cow().as_ref(),
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*capture_positions,
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&mut captured_values,
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) {
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return true;
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}
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} else if self.comparator.regex(
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pattern,
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pattern_expr,
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value,
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*capture_positions,
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&mut captured_values,
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) {
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return true;
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}
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}
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false
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})
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},
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);
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if !captured_values.is_empty() {
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ctx.set_match_variables(captured_values);
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}
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result
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}
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MatchType::Count(rel_match) => {
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let mut count = 0;
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ctx.find_headers(
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&header_list,
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self.index,
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self.mime_anychild,
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|header, _, _| {
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match &mime_opts {
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MimeOpts::None => {
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count += 1;
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}
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MimeOpts::Type | MimeOpts::Subtype | MimeOpts::ContentType => {
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if let HeaderValue::ContentType(_) = &header.value {
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count += 1;
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}
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}
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MimeOpts::Param(params) => {
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if let HeaderValue::ContentType(ct) = &header.value {
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if let Some(attributes) = &ct.attributes {
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for (attr_name, _) in attributes {
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if params
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.iter()
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.any(|p| p.to_cow().eq_ignore_ascii_case(attr_name))
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{
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count += 1;
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}
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}
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}
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}
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}
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}
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false
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},
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);
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let mut result = false;
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for key in &key_list {
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if rel_match.cmp(&Number::from(count), &key.to_number()) {
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result = true;
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break;
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}
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}
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result
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}
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MatchType::List => {
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let mut values: Vec<String> = Vec::new();
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ctx.find_headers(
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&header_list,
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self.index,
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self.mime_anychild,
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|header, _, _| {
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ctx.find_header_values(header, &mime_opts, |value| {
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if !value.is_empty() && !values.iter().any(|v| v.eq(value)) {
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values.push(value.to_string());
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}
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false
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})
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},
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);
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if !values.is_empty() {
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return TestResult::Event {
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event: Event::ListContains {
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lists: ctx.eval_values_owned(&self.key_list),
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values,
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match_as: self.comparator.as_match(),
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},
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is_not: self.is_not,
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};
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}
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false
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}
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};
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TestResult::Bool(result ^ self.is_not)
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}
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}
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impl<'x> Context<'x> {
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pub(crate) fn parse_header_names<'z: 'y, 'y>(
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&'z self,
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header_names: &'y [Value],
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) -> Vec<HeaderName<'y>> {
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let mut result = Vec::with_capacity(header_names.len());
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for header_name in header_names {
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if let Some(header_name) = self.parse_header_name(header_name) {
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result.push(header_name);
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}
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}
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result
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}
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#[inline(always)]
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pub(crate) fn parse_header_name<'z: 'y, 'y>(
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&'z self,
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header_name: &'y Value,
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) -> Option<HeaderName<'y>> {
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HeaderName::parse(self.eval_value(header_name).into_cow())
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}
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pub(crate) fn find_headers(
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&self,
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header_names: &[HeaderName],
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index: Option<i32>,
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any_child: bool,
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mut visitor_fnc: impl FnMut(&Header, usize, usize) -> bool,
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) -> bool {
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let parts = [self.part];
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let mut part_iter = SubpartIterator::new(self, &parts, any_child);
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while let Some((part_id, message_part)) = part_iter.next() {
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'outer: for header_name in header_names {
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match index {
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None => {
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for (pos, header) in message_part
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.headers
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.iter()
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.enumerate()
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.filter(|(_, h)| &h.name == header_name)
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{
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if visitor_fnc(header, part_id, pos) {
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return true;
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}
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}
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}
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Some(index) if index >= 0 => {
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let mut header_count = 0;
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for (pos, header) in message_part.headers.iter().enumerate() {
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if &header.name == header_name {
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header_count += 1;
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if header_count == index {
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if visitor_fnc(header, part_id, pos) {
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return true;
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}
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continue 'outer;
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}
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}
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}
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}
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Some(index) => {
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let index = -index;
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let mut header_count = 0;
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for (pos, header) in message_part.headers.iter().enumerate().rev() {
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if &header.name == header_name {
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header_count += 1;
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if header_count == index {
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if visitor_fnc(header, part_id, pos) {
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return true;
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}
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break;
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}
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}
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}
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}
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}
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}
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}
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false
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}
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#[allow(unused_assignments)]
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pub(crate) fn find_header_values(
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&self,
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header: &Header,
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mime_opts: &MimeOpts<Variable>,
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mut visitor_fnc: impl FnMut(&str) -> bool,
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) -> bool {
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let mut raw_header = None;
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let mut header_value_ = None;
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let header_value = if header.offset_end != 0 {
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&header.value
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} else {
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let value = if let HeaderValue::Text(text) = &header.value {
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text.as_ref()
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} else {
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#[cfg(test)]
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panic!("Unexpected value.");
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#[cfg(not(test))]
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return false;
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};
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if mime_opts == &MimeOpts::None {
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return visitor_fnc(value);
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} else {
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raw_header = format!("{value}\n").into_bytes().into();
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header_value_ = MessageStream::new(raw_header.as_ref().unwrap())
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.parse_content_type()
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.into();
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header_value_.as_ref().unwrap()
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}
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};
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match (mime_opts, header_value) {
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(MimeOpts::None, HeaderValue::Text(text))
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if matches!(
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&header.name,
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HeaderName::Subject
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| HeaderName::Comments
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| HeaderName::ContentDescription
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| HeaderName::ContentLocation
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| HeaderName::ContentTransferEncoding,
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) =>
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{
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visitor_fnc(text.as_ref())
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}
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(MimeOpts::None, _) => {
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if let HeaderValue::Text(text) = MessageStream::new(
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self.message
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.raw_message
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.get(header.offset_start..header.offset_end)
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.unwrap_or(b""),
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)
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.parse_unstructured()
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{
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visitor_fnc(text.as_ref())
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} else {
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visitor_fnc("")
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}
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}
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(MimeOpts::Type, HeaderValue::ContentType(ct)) => visitor_fnc(ct.c_type.as_ref()),
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(MimeOpts::Subtype, HeaderValue::ContentType(ct)) => {
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visitor_fnc(ct.c_subtype.as_deref().unwrap_or(""))
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}
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(MimeOpts::ContentType, HeaderValue::ContentType(ct)) => {
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if let Some(sub_type) = &ct.c_subtype {
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visitor_fnc(&format!("{}/{}", ct.c_type, sub_type))
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} else {
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visitor_fnc(ct.c_type.as_ref())
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}
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}
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(MimeOpts::Param(params), HeaderValue::ContentType(ct)) => {
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if let Some(attributes) = &ct.attributes {
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for param in params {
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for (attr_name, attr_value) in attributes {
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if param.to_cow().eq_ignore_ascii_case(attr_name)
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&& visitor_fnc(attr_value.as_ref())
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{
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return true;
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}
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}
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}
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}
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visitor_fnc("")
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}
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_ => visitor_fnc(""),
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}
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}
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}
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