177 lines
6.4 KiB
Rust
177 lines
6.4 KiB
Rust
//use memmap::{Mmap, Protection};
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use std;
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use base64;
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use chrono;
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use nom::le_u8;
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/* Wow this sucks! */
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named!(quoted_printable_byte<u8>, do_parse!(
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p: map_res!(preceded!(tag!("="), verify!(complete!(take!(2)), |s: &[u8]| { ::nom::is_hex_digit(s[0]) && ::nom::is_hex_digit(s[1]) })), std::str::from_utf8) >>
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( {
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u8::from_str_radix(p, 16).unwrap()
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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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/*
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* if a header value is a Vec<&str>, this is the tail of that Vector
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*/
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named!(valuelist<&str>,
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map_res!(delimited!(alt_complete!(tag!("\t") | tag!(" ")), take_until!("\n"), tag!("\n")), std::str::from_utf8)
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);
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/* Parse the value part of the header -> Vec<&str> */
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named!(value<Vec<&str>>,
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do_parse!(
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head: map_res!(terminated!(take_until!("\n"), tag!("\n")), std::str::from_utf8) >>
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tail: many0!(valuelist) >>
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( {
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let tail_len = tail.len();
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let tail: Vec<&str> = tail.iter().map(|v| { v.trim()}).collect();
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let mut result = Vec::with_capacity(1 + tail.len());
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result.push(head.trim());
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if tail_len == 1 && tail[0] == "" {
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result
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} else {
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tail.iter().fold(result, |mut acc, x| { acc.push(x); acc})
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}
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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>,
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terminated!(verify!(map_res!(take_until1!(":"), std::str::from_utf8), | v: &str | { !v.contains("\n")} ), tag!(":")));
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/* Parse a single header as a tuple -> (&str, Vec<&str>) */
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named!(header<(&str, std::vec::Vec<&str>)>,
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pair!(complete!(name), complete!(value)));
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/* Parse all headers -> Vec<(&str, Vec<&str>)> */
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named!(headers<std::vec::Vec<(&str, std::vec::Vec<&str>)>>,
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many1!(complete!(header)));
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named!(pub mail<(std::vec::Vec<(&str, std::vec::Vec<&str>)>, &[u8])>,
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separated_pair!(headers, tag!("\n"), take_while!(call!(|_| { true }))));
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//pair!(headers, take_while!(call!(|_| { true }))));
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/* try chrono parse_from_str with several formats
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* https://docs.rs/chrono/0.4.0/chrono/struct.DateTime.html#method.parse_from_str
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*/
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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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named!(utf8_token_base64<String>, do_parse!(
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encoded: complete!(delimited!(tag_no_case!("=?UTF-8?B?"), take_until1!("?="), tag!("?="))) >>
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( {
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match base64::decode(encoded) {
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Ok(ref v) => { String::from_utf8_lossy(v).into_owned()
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},
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Err(_) => { String::from_utf8_lossy(encoded).into_owned() }
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}
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} )
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));
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named!(utf8_token_quoted_p_raw<&[u8], &[u8]>,
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complete!(delimited!(tag_no_case!("=?UTF-8?q?"), take_until1!("?="), tag!("?="))));
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//named!(utf8_token_quoted_p<String>, escaped_transform!(call!(alpha), '=', quoted_printable_byte));
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named!(utf8_token_quoted_p<String>, do_parse!(
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raw: call!(utf8_token_quoted_p_raw) >>
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( {
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named!(get_bytes<Vec<u8>>, dbg!(many0!(alt!(quoted_printable_byte | le_u8))));
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let bytes = get_bytes(raw).to_full_result().unwrap();
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String::from_utf8_lossy(&bytes).into_owned()
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} )));
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named!(utf8_token<String>, alt_complete!(
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utf8_token_base64 |
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call!(utf8_token_quoted_p)));
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named!(utf8_token_list<String>, ws!(do_parse!(
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list: separated_nonempty_list!(complete!(tag!(" ")), utf8_token) >>
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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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list.iter().fold(String::with_capacity(list_len), |mut acc, x| { acc.push_str(x); acc})
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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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/* Lots of copying here. TODO: fix it */
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named!(pub subject<String>, ws!(do_parse!(
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list: many0!(alt_complete!( utf8_token_list | ascii_token)) >>
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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 s = list.iter().fold(String::with_capacity(list_len), |mut acc, x| { acc.push_str(x); acc.push_str(" "); acc});
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s.trim().to_string()
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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!((&b""[..], "list.free.de mailing list memberships reminder".to_string()), subject(subject_s).unwrap());
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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!((&b""[..], "Νέο προσωπικό μήνυμα αφίχθη".to_string()), subject(subject_s).unwrap());
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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.chars().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); 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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/* Date should tokenize input and convert the tokens, right now we expect input will have no extra
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* spaces in between tokens */
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pub fn date(input: &str) -> Option<chrono::DateTime<chrono::FixedOffset>> {
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chrono::DateTime::parse_from_rfc2822(eat_comments(input).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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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!(">"))), std::str::from_utf8)
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);
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named!(pub references<Vec<&str>>, many0!(preceded!(is_not!("<"), message_id)));
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