157 lines
4.8 KiB
Rust
157 lines
4.8 KiB
Rust
/*
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* meli - melib crate.
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*
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* Copyright 2017-2020 Manos Pitsidianakis
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*
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* This file is part of meli.
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*
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* meli is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* meli 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with meli. If not, see <http://www.gnu.org/licenses/>.
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*/
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use super::*;
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use crate::email::parser::IResult;
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use nom::{
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bytes::complete::{is_not, tag},
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combinator::opt,
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};
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use std::str::FromStr;
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pub struct NntpLineIterator<'a> {
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slice: &'a str,
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}
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impl<'a> std::iter::DoubleEndedIterator for NntpLineIterator<'a> {
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fn next_back(&mut self) -> Option<Self::Item> {
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if self.slice.is_empty() {
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None
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} else if let Some(pos) = self.slice.rfind("\r\n") {
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if self.slice[..pos].is_empty() {
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self.slice = &self.slice[..pos];
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None
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} else if let Some(prev_pos) = self.slice[..pos].rfind("\r\n") {
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let ret = &self.slice[prev_pos + 2..pos + 2];
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self.slice = &self.slice[..prev_pos + 2];
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Some(ret)
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} else {
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let ret = self.slice;
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self.slice = &self.slice[ret.len()..];
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Some(ret)
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}
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} else {
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let ret = self.slice;
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self.slice = &self.slice[ret.len()..];
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Some(ret)
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}
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}
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}
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impl<'a> Iterator for NntpLineIterator<'a> {
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type Item = &'a str;
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fn next(&mut self) -> Option<&'a str> {
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if self.slice.is_empty() {
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None
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} else if let Some(pos) = self.slice.find("\r\n") {
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let ret = &self.slice[..pos + 2];
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self.slice = &self.slice[pos + 2..];
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Some(ret)
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} else {
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let ret = self.slice;
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self.slice = &self.slice[ret.len()..];
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Some(ret)
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}
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}
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}
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pub trait NntpLineSplit {
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fn split_rn(&self) -> NntpLineIterator;
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}
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impl NntpLineSplit for str {
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fn split_rn(&self) -> NntpLineIterator {
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NntpLineIterator { slice: self }
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}
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}
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pub fn over_article(input: &str) -> IResult<&str, (UID, Envelope)> {
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/*
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"0" or article number (see below)
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Subject header content
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From header content
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Date header content
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Message-ID header content
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References header content
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:bytes metadata item
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:lines metadata item
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*/
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let (input, num) = is_not("\t")(input)?;
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let (input, _) = tag("\t")(input)?;
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let (input, subject) = opt(is_not("\t"))(input)?;
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let (input, _) = tag("\t")(input)?;
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let (input, from) = opt(is_not("\t"))(input)?;
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let (input, _) = tag("\t")(input)?;
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let (input, date) = opt(is_not("\t"))(input)?;
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let (input, _) = tag("\t")(input)?;
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let (input, message_id) = opt(is_not("\t"))(input)?;
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let (input, _) = tag("\t")(input)?;
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let (input, references) = opt(is_not("\t"))(input)?;
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let (input, _) = tag("\t")(input)?;
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let (input, _bytes) = opt(is_not("\t"))(input)?;
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let (input, _) = tag("\t")(input)?;
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let (input, _lines) = opt(is_not("\t\r\n"))(input)?;
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let (input, _other_headers) = opt(is_not("\r\n"))(input)?;
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let (input, _) = tag("\r\n")(input)?;
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Ok((
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input,
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({
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let env_hash = {
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let mut hasher = DefaultHasher::new();
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hasher.write(num.as_bytes());
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hasher.write(message_id.unwrap_or_default().as_bytes());
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hasher.finish()
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};
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let mut env = Envelope::new(env_hash);
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if let Some(date) = date {
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env.set_date(date.as_bytes());
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if let Ok(d) =
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crate::email::parser::dates::rfc5322_date(env.date_as_str().as_bytes())
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{
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env.set_datetime(d);
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}
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}
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if let Some(subject) = subject {
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env.set_subject(subject.into());
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}
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if let Some(from) = from {
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if let Ok((_, from)) =
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crate::email::parser::address::rfc2822address_list(from.as_bytes())
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{
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env.set_from(from);
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}
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}
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if let Some(references) = references {
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env.set_references(references.as_bytes());
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}
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if let Some(message_id) = message_id {
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env.set_message_id(message_id.as_bytes());
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}
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(usize::from_str(num).unwrap(), env)
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}),
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))
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}
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