473 lines
16 KiB
Rust
473 lines
16 KiB
Rust
/*
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* meli - parser module
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*
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* Copyright 2017 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 std;
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use std::str::from_utf8;
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use base64;
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use chrono;
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use nom::{is_hex_digit, le_u8};
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use nom::{ErrorKind, IResult, Needed};
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use nom::{Compare, CompareResult};
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use encoding::{DecoderTrap, Encoding};
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fn quoted_printable_byte(input: &[u8]) -> IResult<&[u8], u8> {
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if input.is_empty() || input.len() < 3 {
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IResult::Incomplete(Needed::Size(1))
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} else if input[0] == b'=' && is_hex_digit(input[1]) && is_hex_digit(input[2]) {
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let a = if input[1] < b':' {
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input[1] - 48
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} else if input[1] < b'[' {
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input[1] - 55
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} else {
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input[1] - 87
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};
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let b = if input[2] < b':' {
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input[2] - 48
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} else if input[2] < b'[' {
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input[2] - 55
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} else {
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input[2] - 87
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};
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IResult::Done(&input[3..], a * 16 + b)
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} else {
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IResult::Error(error_code!(ErrorKind::Custom(43)))
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}
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}
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// Parser definition
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/* A header can span multiple lines, eg:
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*
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* Received: from -------------------- (-------------------------)
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* by --------------------- (--------------------- [------------------]) (-----------------------)
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* with ESMTP id ------------ for <------------------->;
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* Tue, 5 Jan 2016 21:30:44 +0100 (CET)
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*/
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fn header_value(input: &[u8]) -> IResult<&[u8], &str> {
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if input.is_empty() || input[0] == b'\n' {
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IResult::Incomplete(Needed::Unknown)
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} else {
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let input_len = input.len();
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for (i, x) in input.iter().enumerate() {
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if *x == b'\n' {
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if (i + 1) < input_len &&
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((input[i + 1] != b' ' && input[i + 1] != b'\t') || input[i + 1] == b'\n')
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{
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return match from_utf8(&input[0..i]) {
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Ok(v) => IResult::Done(&input[(i + 1)..], v),
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Err(_) => IResult::Error(error_code!(ErrorKind::Custom(43))),
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};
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} else if i + 1 > input_len {
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return IResult::Incomplete(Needed::Size(1));
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}
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}
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}
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IResult::Error(error_code!(ErrorKind::Custom(43)))
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}
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}
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/* Parse the name part of the header -> &str */
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named!(name<&str>, map_res!(is_not!(":\n"), from_utf8));
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/* Parse a single header as a tuple -> (&str, Vec<&str>) */
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named!(
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header<(&str, &str)>,
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separated_pair!(complete!(name), ws!(tag!(":")), complete!(header_value))
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);
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/* Parse all headers -> Vec<(&str, Vec<&str>)> */
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named!(pub headers<std::vec::Vec<(&str, &str)>>,
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many1!(complete!(header)));
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named!(pub headers_raw<&[u8]>,
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take_until1!("\n\n"));
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named!(pub body_raw<&[u8]>,
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do_parse!(
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take_until1!("\n\n") >>
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body: take_while!(call!(|_| true)) >>
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( { body } )));
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named!(pub mail<(std::vec::Vec<(&str, &str)>, &[u8])>,
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separated_pair!(headers, tag!("\n"), take_while!(call!(|_| true))));
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named!(pub attachment<(std::vec::Vec<(&str, &str)>, &[u8])>,
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do_parse!(
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opt!(is_a!(" \n\t\r")) >>
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pair: pair!(many0!(complete!(header)), take_while!(call!(|_| true))) >>
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( { pair } )));
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/* Header parsers */
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/* Encoded words
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*"=?charset?encoding?encoded text?=".
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*/
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/* TODO: make a map of encodings and decoding functions so that they can be reused and easily
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* extended */
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use encoding::all::{ISO_8859_1, ISO_8859_2, ISO_8859_7, WINDOWS_1253, GBK};
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fn encoded_word(input: &[u8]) -> IResult<&[u8], Vec<u8>> {
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if input.len() < 5 {
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return IResult::Incomplete(Needed::Unknown);
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} else if input[0] != b'=' || input[1] != b'?' {
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return IResult::Error(error_code!(ErrorKind::Custom(43)));
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}
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for tag in &[
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"UTF-8",
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"iso-8859-7",
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"windows-1253",
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"iso-8859-1",
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"iso-8859-2",
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"gbk",
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] {
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if let CompareResult::Ok = (&input[2..]).compare_no_case(*tag) {
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let tag_len = tag.len();
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/* tag must end with ?_? where _ is either Q or B, eg: =?UTF-8?B? */
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if input[2 + tag_len] != b'?' || input[2 + tag_len + 2] != b'?' {
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return IResult::Error(error_code!(ErrorKind::Custom(43)));
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}
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/* See if input ends with "?=" and get ending index */
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let mut encoded_idx = None;
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for i in (5 + tag_len)..input.len() {
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if input[i] == b'?' && i < input.len() && input[i + 1] == b'=' {
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encoded_idx = Some(i);
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break;
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}
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}
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if encoded_idx.is_none() {
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return IResult::Error(error_code!(ErrorKind::Custom(43)));
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}
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let encoded = &input[5 + tag_len..encoded_idx.unwrap()];
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let s: Vec<u8> = match input[2 + tag_len + 1] {
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b'b' | b'B' => match base64::decode(encoded) {
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Ok(v) => v,
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Err(_) => encoded.to_vec(),
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},
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b'q' | b'Q' => match get_quoted_printed_bytes(encoded) {
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IResult::Done(b"", s) => s,
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_ => return IResult::Error(error_code!(ErrorKind::Custom(43))),
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},
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_ => return IResult::Error(error_code!(ErrorKind::Custom(43))),
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};
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match *tag {
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"UTF-8" => {
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return IResult::Done(&input[encoded_idx.unwrap() + 2..], s);
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}
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"iso-8859-7" => {
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return if let Ok(v) = ISO_8859_7.decode(&s, DecoderTrap::Strict) {
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IResult::Done(&input[encoded_idx.unwrap() + 2..], v.into_bytes())
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} else {
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IResult::Error(error_code!(ErrorKind::Custom(43)))
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}
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}
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"windows-1253" => {
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return if let Ok(v) = WINDOWS_1253.decode(&s, DecoderTrap::Strict) {
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IResult::Done(&input[encoded_idx.unwrap() + 2..], v.into_bytes())
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} else {
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IResult::Error(error_code!(ErrorKind::Custom(43)))
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}
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}
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"iso-8859-1" => {
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return if let Ok(v) = ISO_8859_1.decode(&s, DecoderTrap::Strict) {
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IResult::Done(&input[encoded_idx.unwrap() + 2..], v.into_bytes())
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} else {
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IResult::Error(error_code!(ErrorKind::Custom(43)))
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}
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}
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"iso-8859-2" => {
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return if let Ok(v) = ISO_8859_2.decode(&s, DecoderTrap::Strict) {
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IResult::Done(&input[encoded_idx.unwrap() + 2..], v.into_bytes())
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} else {
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IResult::Error(error_code!(ErrorKind::Custom(43)))
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}
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}
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"gbk" => {
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return if let Ok(v) = GBK.decode(&s, DecoderTrap::Strict) {
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IResult::Done(&input[encoded_idx.unwrap() + 2..], v.into_bytes())
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} else {
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IResult::Error(error_code!(ErrorKind::Custom(43)))
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}
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}
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_ => {
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panic!();
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}
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}
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} else {
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continue;
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}
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}
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eprintln!("unknown tag is {:?}", from_utf8(&input[2..20]));
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IResult::Error(error_code!(ErrorKind::Custom(43)))
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}
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named!(qp_underscore_header<u8>, do_parse!(tag!("_") >> ({ b' ' })));
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named!(
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get_quoted_printed_bytes<Vec<u8>>,
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many0!(alt_complete!(
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quoted_printable_byte | qp_underscore_header | le_u8
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))
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);
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named!(encoded_word_list<String>, ws!(do_parse!(
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list: separated_nonempty_list!(complete!(is_a!(" \n\r\t")), encoded_word) >>
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( {
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let list_len = list.iter().fold(0, |mut acc, x| { acc+=x.len(); acc });
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let bytes = list.iter().fold(Vec::with_capacity(list_len), |mut acc, x| { acc.append(&mut x.clone()); acc});
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String::from_utf8_lossy(&bytes).into_owned()
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} )
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)));
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named!(ascii_token<String>, do_parse!(
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word: alt!(terminated!(take_until1!("=?"), peek!(tag_no_case!("=?UTF-8?"))) | take_while!(call!(|_| { true }))) >>
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( {
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String::from_utf8_lossy(word).into_owned()
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} )));
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named!(pub subject<String>, ws!(do_parse!(
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list: many0!(alt_complete!( encoded_word_list | ascii_token)) >>
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( {
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let string_len = list.iter().fold(0, |mut acc, x| { acc+=x.len(); acc }) + list.len() - 1;
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let list_len = list.len();
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let mut i = 0;
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list.iter().fold(String::with_capacity(string_len),
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|acc, x| {
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let mut acc = acc + &x.replace("\n", "");
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if i != list_len - 1 {
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acc.push_str(" ");
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i+=1;
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}
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acc
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})
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} )
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)));
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#[test]
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fn test_subject() {
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let subject_s = "list.free.de mailing list memberships reminder".as_bytes();
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assert_eq!(
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(
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&b""[..],
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"list.free.de mailing list memberships reminder".to_string()
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),
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subject(subject_s).unwrap()
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);
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let subject_s = "=?UTF-8?B?zp3Orc6/IM+Az4HOv8+Dz4nPgM65zrrPjCDOvM6uzr3Phc68zrEgzrHPhs6v?= =?UTF-8?B?z4fOuM63?=".as_bytes();
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assert_eq!(
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(
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&b""[..],
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"Νέο προσωπικό μήνυμα αφίχθη".to_string()
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),
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subject(subject_s).unwrap()
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);
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let subject_s = "=?utf-8?B?bW9vZGxlOiDOsc69zrHPg866z4zPgM63z4POtyDOv868zqzOtM6xz4Igz4M=?= =?utf-8?B?z4XOts63z4TOrs+DzrXPic69?=".as_bytes();
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assert_eq!(
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(
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&b""[..],
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"moodle: ανασκόπηση ομάδας συζητήσεων".to_string()
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),
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subject(subject_s).unwrap()
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);
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let subject_s =
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"=?UTF-8?B?zp3Orc6/IM+Az4HOv8+Dz4nPgM65zrrPjCDOvM6uzr3Phc68zrEgzrHPhs6v?=".as_bytes();
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assert_eq!(
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"Νέο προσωπικό μήνυμα αφί".to_string(),
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from_utf8(&encoded_word(subject_s).to_full_result().unwrap()).unwrap()
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);
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let subject_s = "=?UTF-8?Q?=CE=A0=CF=81=CF=8C=CF=83=CE=B8=CE=B5?=".as_bytes();
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assert_eq!(
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"Πρόσθε".to_string(),
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from_utf8(&encoded_word(subject_s).to_full_result().unwrap()).unwrap()
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);
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let subject_s = "=?iso-8859-7?B?UmU6INDx/OLr5+zhIOzlIPTn7SDh9fHp4e3eIOLh8eTp4Q==?=".as_bytes();
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assert_eq!(
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"Re: Πρόβλημα με την αυριανή βαρδια".to_string(),
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from_utf8(&encoded_word(subject_s).to_full_result().unwrap()).unwrap()
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);
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let subject_s = "=?UTF-8?Q?=CE=A0=CF=81=CF=8C=CF=83=CE=B8=CE=B5?=
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=?UTF-8?Q?=CF=84=CE=B7_=CE=B5=CE=BE=CE=B5=CF=84?=
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=?UTF-8?Q?=CE=B1=CF=83=CF=84=CE=B9=CE=BA=CE=AE?="
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.as_bytes();
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assert_eq!(
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(
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&b""[..],
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"Πρόσθετη εξεταστική".to_string()
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),
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subject(subject_s).unwrap()
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);
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}
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fn eat_comments(input: &str) -> String {
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let mut in_comment = false;
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input
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.chars()
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.fold(String::with_capacity(input.len()), |mut acc, x| {
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if x == '(' && !in_comment {
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in_comment = true;
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acc
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} else if x == ')' && in_comment {
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in_comment = false;
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acc
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} else if in_comment {
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acc
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} else {
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acc.push(x);
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acc
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}
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})
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}
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#[test]
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fn test_eat_comments() {
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let s = "Mon (Lundi), 4(quatre)May (Mai) 1998(1998-05-04)03 : 04 : 12 +0000";
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assert_eq!(eat_comments(s), "Mon , 4May 199803 : 04 : 12 +0000");
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let s = "Thu, 31 Aug 2017 13:43:37 +0000 (UTC)";
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assert_eq!(eat_comments(s), "Thu, 31 Aug 2017 13:43:37 +0000 ");
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}
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/*
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* Date should tokenize input and convert the tokens,
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* right now we expect input will have no extra spaces in between tokens
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*
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* We should use a custom parser here*/
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pub fn date(input: &str) -> Option<chrono::DateTime<chrono::FixedOffset>> {
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let parsed_result = subject(eat_comments(input).as_bytes())
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.to_full_result()
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.unwrap()
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.replace("-", "+");
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chrono::DateTime::parse_from_rfc2822(parsed_result.trim()).ok()
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}
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#[test]
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fn test_date() {
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let s = "Thu, 31 Aug 2017 13:43:37 +0000 (UTC)";
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let _s = "Thu, 31 Aug 2017 13:43:37 +0000";
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let __s = "=?utf-8?q?Thu=2C_31_Aug_2017_13=3A43=3A37_-0000?=";
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assert_eq!(date(s).unwrap(), date(_s).unwrap());
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assert_eq!(date(_s).unwrap(), date(__s).unwrap());
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}
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named!(pub message_id<&str>,
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map_res!(complete!(delimited!(tag!("<"), take_until1!(">"), tag!(">"))), from_utf8)
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);
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fn message_id_peek(input: &[u8]) -> IResult<&[u8], &str> {
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let input_length = input.len();
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if input.is_empty() {
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IResult::Incomplete(Needed::Size(1))
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} else if input_length == 2 || input[0] != b'<' {
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IResult::Error(error_code!(ErrorKind::Custom(43)))
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} else {
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for (i, &x) in input.iter().take(input_length).enumerate().skip(1) {
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if x == b'>' {
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return IResult::Done(&input[i + 1..], from_utf8(&input[0..i + 1]).unwrap());
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}
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}
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IResult::Incomplete(Needed::Unknown)
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}
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}
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named!(pub references<Vec<&str>>, separated_list!(complete!(is_a!(" \n\t\r")), message_id_peek));
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named_args!(pub attachments<'a>(boundary: &'a str, boundary_end: &'a str) < Vec<&'this_is_probably_unique_i_hope_please [u8]> >,
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alt_complete!(do_parse!(
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take_until!(boundary) >>
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vecs: many0!(complete!(do_parse!(
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tag!(boundary) >>
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tag!("\n") >>
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body: take_until1!(boundary) >>
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( { body } )))) >>
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tag!(boundary_end) >>
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tag!("\n") >>
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take_while!(call!(|_| { true })) >>
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( {
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vecs
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} )
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) | do_parse!(
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take_until!(boundary_end) >>
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tag!(boundary_end) >>
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( { Vec::<&[u8]>::new() } ))
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));
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#[test]
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fn test_attachments() {
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use std::io::Read;
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let mut buffer: Vec<u8> = Vec::new();
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let _ = std::fs::File::open("test/attachment_test")
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.unwrap()
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.read_to_end(&mut buffer);
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let boundary = "--b1_4382d284f0c601a737bb32aaeda53160--";
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let boundary_len = boundary.len();
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let (_, body) = match mail(&buffer).to_full_result() {
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Ok(v) => v,
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Err(_) => panic!(),
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};
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let attachments = attachments(body, &boundary[0..boundary_len - 2], &boundary)
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.to_full_result()
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.unwrap();
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assert_eq!(attachments.len(), 4);
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}
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named!(
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content_type_parameter<(&str, &str)>,
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do_parse!(
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tag!(";") >>
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name: terminated!(map_res!(ws!(take_until!("=")), from_utf8), tag!("=")) >>
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value: map_res!(ws!(
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alt_complete!(delimited!(tag!("\""), take_until!("\""), tag!("\"")) | is_not!(";"))),
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from_utf8) >>
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( {
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(name, value)
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} )
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)
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);
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named!(pub content_type< (&str, &str, Vec<(&str, &str)>) >,
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do_parse!(
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_type: map_res!(take_until!("/"), from_utf8) >>
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|
tag!("/") >>
|
|
_subtype: map_res!(is_not!(";"), from_utf8) >>
|
|
parameters: many0!(complete!(content_type_parameter)) >>
|
|
( {
|
|
(_type, _subtype, parameters)
|
|
} )
|
|
));
|
|
|
|
|
|
named!(pub quoted_printable_text<String>,
|
|
do_parse!(
|
|
bytes: many0!(alt_complete!(
|
|
preceded!(tag!("=\n"), quoted_printable_byte) |
|
|
preceded!(tag!("=\n"), le_u8) |
|
|
quoted_printable_byte |
|
|
le_u8)) >>
|
|
( {
|
|
String::from_utf8_lossy(&bytes).into_owned()
|
|
} )
|
|
)
|
|
);
|