641 lines
22 KiB
Rust
641 lines
22 KiB
Rust
/*
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* meli - imap module.
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*
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* Copyright 2017 - 2019 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::protocol_parser::ImapLineSplit;
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use crate::email::parser::BytesExt;
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use crate::error::*;
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use std::io::Read;
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use std::io::Write;
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extern crate native_tls;
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use fnv::FnvHashSet;
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use native_tls::TlsConnector;
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use std::iter::FromIterator;
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use std::net::SocketAddr;
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use std::sync::{Arc, Mutex};
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use std::time::Instant;
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use super::protocol_parser;
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use super::{Capabilities, ImapServerConf};
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#[derive(Debug)]
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pub struct ImapStream {
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cmd_id: usize,
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stream: native_tls::TlsStream<std::net::TcpStream>,
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}
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#[derive(Debug)]
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pub struct ImapConnection {
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pub stream: Result<ImapStream>,
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pub server_conf: ImapServerConf,
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pub capabilities: Capabilities,
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pub online: Arc<Mutex<(Instant, Result<()>)>>,
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}
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impl Drop for ImapStream {
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fn drop(&mut self) {
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self.send_command(b"LOGOUT").ok().take();
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}
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}
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impl ImapStream {
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pub fn read_response(&mut self, ret: &mut String) -> Result<()> {
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let id = format!("M{} ", self.cmd_id - 1);
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self.read_lines(ret, &id)
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}
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pub fn read_lines(&mut self, ret: &mut String, termination_string: &str) -> Result<()> {
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let mut buf: [u8; 1024] = [0; 1024];
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ret.clear();
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let mut last_line_idx: usize = 0;
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loop {
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match self.stream.read(&mut buf) {
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Ok(0) => break,
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Ok(b) => {
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ret.push_str(unsafe { std::str::from_utf8_unchecked(&buf[0..b]) });
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if let Some(mut pos) = ret[last_line_idx..].rfind("\r\n") {
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if ret[last_line_idx..].starts_with("* BYE") {
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return Err(MeliError::new("Disconnected"));
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}
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if let Some(prev_line) =
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ret[last_line_idx..pos + last_line_idx].rfind("\r\n")
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{
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last_line_idx += prev_line + 2;
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pos -= prev_line + 2;
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}
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if pos + "\r\n".len() == ret[last_line_idx..].len() {
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if !termination_string.is_empty()
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&& ret[last_line_idx..].starts_with(termination_string)
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{
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debug!(&ret[last_line_idx..]);
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ret.replace_range(last_line_idx.., "");
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break;
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} else if termination_string.is_empty() {
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break;
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}
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}
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last_line_idx += pos + 2;
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}
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}
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Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {
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continue;
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}
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Err(e) => {
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return Err(MeliError::from(e));
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}
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}
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}
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Ok(())
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}
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pub fn wait_for_continuation_request(&mut self) -> Result<()> {
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let term = "+ ".to_string();
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let mut ret = String::new();
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self.read_lines(&mut ret, &term)
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}
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pub fn send_command(&mut self, command: &[u8]) -> Result<usize> {
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let command = command.trim();
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self.stream.write_all(b"M")?;
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self.stream.write_all(self.cmd_id.to_string().as_bytes())?;
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self.stream.write_all(b" ")?;
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let ret = self.cmd_id;
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self.cmd_id += 1;
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self.stream.write_all(command)?;
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self.stream.write_all(b"\r\n")?;
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debug!("sent: M{} {}", self.cmd_id - 1, unsafe {
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std::str::from_utf8_unchecked(command)
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});
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Ok(ret)
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}
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pub fn send_literal(&mut self, data: &[u8]) -> Result<()> {
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self.stream.write_all(data)?;
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if !data.ends_with(b"\r\n") {
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self.stream.write_all(b"\r\n")?;
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}
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self.stream.write_all(b"\r\n")?;
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Ok(())
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}
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pub fn send_raw(&mut self, raw: &[u8]) -> Result<()> {
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self.stream.write_all(raw)?;
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self.stream.write_all(b"\r\n")?;
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Ok(())
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}
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pub fn set_nonblocking(&mut self, val: bool) -> Result<()> {
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self.stream.get_mut().set_nonblocking(val)?;
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Ok(())
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}
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pub fn new_connection(server_conf: &ImapServerConf) -> Result<(Capabilities, ImapStream)> {
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use std::io::prelude::*;
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use std::net::TcpStream;
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let path = &server_conf.server_hostname;
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let mut connector = TlsConnector::builder();
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if server_conf.danger_accept_invalid_certs {
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connector.danger_accept_invalid_certs(true);
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}
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let connector = connector.build()?;
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let addr = if let Ok(a) = lookup_ipv4(path, server_conf.server_port) {
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a
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} else {
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return Err(MeliError::new(format!(
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"Could not lookup address {}",
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&path
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)));
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};
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let mut socket = TcpStream::connect(&addr)?;
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socket.set_read_timeout(Some(std::time::Duration::new(120, 0)))?;
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socket.set_write_timeout(Some(std::time::Duration::new(120, 0)))?;
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let cmd_id = 0;
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if server_conf.use_starttls {
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socket.write_all(format!("M{} STARTTLS\r\n", cmd_id).as_bytes())?;
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let mut buf = vec![0; 1024];
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let mut response = String::with_capacity(1024);
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let mut broken = false;
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let now = std::time::Instant::now();
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while now.elapsed().as_secs() < 3 {
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let len = socket.read(&mut buf)?;
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response.push_str(unsafe { std::str::from_utf8_unchecked(&buf[0..len]) });
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if response.starts_with("* OK ") && response.find("\r\n").is_some() {
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if let Some(pos) = response.as_bytes().find(b"\r\n") {
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response.drain(0..pos + 2);
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}
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}
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if response.starts_with("M0 OK") {
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broken = true;
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break;
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}
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}
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if !broken {
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return Err(MeliError::new(format!(
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"Could not initiate TLS negotiation to {}.",
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path
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)));
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}
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}
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socket
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.set_nonblocking(true)
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.expect("set_nonblocking call failed");
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let stream = {
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let mut conn_result = connector.connect(path, socket);
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if let Err(native_tls::HandshakeError::WouldBlock(midhandshake_stream)) = conn_result {
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let mut midhandshake_stream = Some(midhandshake_stream);
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loop {
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match midhandshake_stream.take().unwrap().handshake() {
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Ok(r) => {
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conn_result = Ok(r);
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break;
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}
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Err(native_tls::HandshakeError::WouldBlock(stream)) => {
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midhandshake_stream = Some(stream);
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}
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p => {
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p?;
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}
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}
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}
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}
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conn_result?
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};
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let mut res = String::with_capacity(8 * 1024);
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let mut ret = ImapStream { cmd_id, stream };
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ret.send_command(b"CAPABILITY")?;
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ret.read_response(&mut res)?;
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let capabilities: std::result::Result<Vec<&[u8]>, _> = res
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.split_rn()
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.find(|l| l.starts_with("* CAPABILITY"))
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.ok_or_else(|| MeliError::new(""))
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.and_then(|res| {
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protocol_parser::capabilities(res.as_bytes())
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.to_full_result()
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.map_err(|_| MeliError::new(""))
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});
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if capabilities.is_err() {
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return Err(MeliError::new(format!(
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"Could not connect to {}: expected CAPABILITY response but got:{}",
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&server_conf.server_hostname, res
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)));
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}
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let capabilities = capabilities.unwrap();
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if !capabilities
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.iter()
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.any(|cap| cap.eq_ignore_ascii_case(b"IMAP4rev1"))
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{
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return Err(MeliError::new(format!(
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"Could not connect to {}: server is not IMAP4rev1 compliant",
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&server_conf.server_hostname
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)));
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} else if capabilities
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.iter()
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.any(|cap| cap.eq_ignore_ascii_case(b"LOGINDISABLED"))
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{
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return Err(MeliError::new(format!(
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"Could not connect to {}: server does not accept logins [LOGINDISABLED]",
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&server_conf.server_hostname
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)));
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}
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let mut capabilities = None;
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ret.send_command(
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format!(
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"LOGIN \"{}\" \"{}\"",
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&server_conf.server_username, &server_conf.server_password
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)
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.as_bytes(),
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)?;
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let tag_start = format!("M{} ", (ret.cmd_id - 1));
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loop {
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ret.read_lines(&mut res, &String::new())?;
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let mut should_break = false;
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for l in res.split_rn() {
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if l.starts_with("* CAPABILITY") {
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capabilities = protocol_parser::capabilities(l.as_bytes())
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.to_full_result()
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.map(|capabilities| {
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FnvHashSet::from_iter(
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capabilities.into_iter().map(|s: &[u8]| s.to_vec()),
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)
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})
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.ok();
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}
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if l.starts_with(tag_start.as_str()) {
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if !l[tag_start.len()..].trim().starts_with("OK ") {
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return Err(MeliError::new(format!(
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"Could not connect. Server replied with '{}'",
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l[tag_start.len()..].trim()
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)));
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}
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should_break = true;
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}
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}
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if should_break {
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break;
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}
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}
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if capabilities.is_none() {
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/* sending CAPABILITY after LOGIN automatically is an RFC recommendation, so check
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* for lazy servers */
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drop(capabilities);
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ret.send_command(b"CAPABILITY")?;
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ret.read_response(&mut res).unwrap();
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let capabilities = protocol_parser::capabilities(res.as_bytes()).to_full_result()?;
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let capabilities = FnvHashSet::from_iter(capabilities.into_iter().map(|s| s.to_vec()));
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Ok((capabilities, ret))
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} else {
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let capabilities = capabilities.unwrap();
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Ok((capabilities, ret))
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}
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}
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}
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impl ImapConnection {
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pub fn new_connection(
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server_conf: &ImapServerConf,
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online: Arc<Mutex<(Instant, Result<()>)>>,
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) -> ImapConnection {
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ImapConnection {
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stream: Err(MeliError::new("Offline".to_string())),
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server_conf: server_conf.clone(),
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capabilities: Capabilities::default(),
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online,
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}
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}
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pub fn read_response(&mut self, ret: &mut String) -> Result<()> {
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if let Ok(ref mut stream) = self.stream {
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if let Ok(_) = stream.read_response(ret) {
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return Ok(());
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}
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}
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let new_stream = ImapStream::new_connection(&self.server_conf);
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if new_stream.is_err() {
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*self.online.lock().unwrap() = (
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Instant::now(),
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Err(new_stream.as_ref().unwrap_err().clone()),
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);
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} else {
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*self.online.lock().unwrap() = (Instant::now(), Ok(()));
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}
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let (capabilities, mut stream) = new_stream?;
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let ret = stream.read_response(ret);
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if ret.is_ok() {
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self.stream = Ok(stream);
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self.capabilities = capabilities;
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}
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ret
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}
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pub fn read_lines(&mut self, ret: &mut String, termination_string: String) -> Result<()> {
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if let (instant, ref mut status @ Ok(())) = *self.online.lock().unwrap() {
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if Instant::now().duration_since(instant) >= std::time::Duration::new(60 * 30, 0) {
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*status = Err(MeliError::new("Connection timed out"));
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self.stream = Err(MeliError::new("Connection timed out"));
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}
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}
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if let Ok(ref mut stream) = self.stream {
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if let Ok(_) = stream.read_lines(ret, &termination_string) {
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return Ok(());
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}
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}
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let new_stream = ImapStream::new_connection(&self.server_conf);
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if new_stream.is_err() {
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*self.online.lock().unwrap() = (
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Instant::now(),
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Err(new_stream.as_ref().unwrap_err().clone()),
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);
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} else {
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*self.online.lock().unwrap() = (Instant::now(), Ok(()));
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}
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let (capabilities, mut stream) = new_stream?;
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let ret = stream.read_lines(ret, &termination_string);
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if ret.is_ok() {
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self.stream = Ok(stream);
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self.capabilities = capabilities;
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}
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ret
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}
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pub fn wait_for_continuation_request(&mut self) -> Result<()> {
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if let (instant, ref mut status @ Ok(())) = *self.online.lock().unwrap() {
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if Instant::now().duration_since(instant) >= std::time::Duration::new(60 * 30, 0) {
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*status = Err(MeliError::new("Connection timed out"));
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self.stream = Err(MeliError::new("Connection timed out"));
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}
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}
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if let Ok(ref mut stream) = self.stream {
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if let Ok(_) = stream.wait_for_continuation_request() {
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return Ok(());
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}
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}
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let new_stream = ImapStream::new_connection(&self.server_conf);
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if new_stream.is_err() {
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*self.online.lock().unwrap() = (
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Instant::now(),
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Err(new_stream.as_ref().unwrap_err().clone()),
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);
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} else {
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*self.online.lock().unwrap() = (Instant::now(), Ok(()));
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}
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let (capabilities, mut stream) = new_stream?;
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let ret = stream.wait_for_continuation_request();
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if ret.is_ok() {
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self.stream = Ok(stream);
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self.capabilities = capabilities;
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}
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ret
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}
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pub fn send_command(&mut self, command: &[u8]) -> Result<usize> {
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if let (instant, ref mut status @ Ok(())) = *self.online.lock().unwrap() {
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if Instant::now().duration_since(instant) >= std::time::Duration::new(60 * 30, 0) {
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*status = Err(MeliError::new("Connection timed out"));
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self.stream = Err(MeliError::new("Connection timed out"));
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}
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}
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if let Ok(ref mut stream) = self.stream {
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if let Ok(ret) = stream.send_command(command) {
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return Ok(ret);
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}
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}
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let new_stream = ImapStream::new_connection(&self.server_conf);
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if new_stream.is_err() {
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*self.online.lock().unwrap() = (
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Instant::now(),
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Err(new_stream.as_ref().unwrap_err().clone()),
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);
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} else {
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*self.online.lock().unwrap() = (Instant::now(), Ok(()));
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}
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let (capabilities, mut stream) = new_stream?;
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let ret = stream.send_command(command);
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if ret.is_ok() {
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self.stream = Ok(stream);
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self.capabilities = capabilities;
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}
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ret
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}
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pub fn send_literal(&mut self, data: &[u8]) -> Result<()> {
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if let (instant, ref mut status @ Ok(())) = *self.online.lock().unwrap() {
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if Instant::now().duration_since(instant) >= std::time::Duration::new(60 * 30, 0) {
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*status = Err(MeliError::new("Connection timed out"));
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self.stream = Err(MeliError::new("Connection timed out"));
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}
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}
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if let Ok(ref mut stream) = self.stream {
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if let Ok(_) = stream.send_literal(data) {
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return Ok(());
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}
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}
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let new_stream = ImapStream::new_connection(&self.server_conf);
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if new_stream.is_err() {
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*self.online.lock().unwrap() = (
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Instant::now(),
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Err(new_stream.as_ref().unwrap_err().clone()),
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);
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} else {
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*self.online.lock().unwrap() = (Instant::now(), Ok(()));
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}
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let (capabilities, mut stream) = new_stream?;
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let ret = stream.send_literal(data);
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if ret.is_ok() {
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self.stream = Ok(stream);
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self.capabilities = capabilities;
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}
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ret
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}
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pub fn send_raw(&mut self, raw: &[u8]) -> Result<()> {
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if let (instant, ref mut status @ Ok(())) = *self.online.lock().unwrap() {
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if Instant::now().duration_since(instant) >= std::time::Duration::new(60 * 30, 0) {
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*status = Err(MeliError::new("Connection timed out"));
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self.stream = Err(MeliError::new("Connection timed out"));
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}
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}
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if let Ok(ref mut stream) = self.stream {
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if let Ok(_) = stream.send_raw(raw) {
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return Ok(());
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}
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}
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let new_stream = ImapStream::new_connection(&self.server_conf);
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if new_stream.is_err() {
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*self.online.lock().unwrap() = (
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Instant::now(),
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Err(new_stream.as_ref().unwrap_err().clone()),
|
|
);
|
|
} else {
|
|
*self.online.lock().unwrap() = (Instant::now(), Ok(()));
|
|
}
|
|
let (capabilities, mut stream) = new_stream?;
|
|
let ret = stream.send_raw(raw);
|
|
if ret.is_ok() {
|
|
self.stream = Ok(stream);
|
|
self.capabilities = capabilities;
|
|
}
|
|
ret
|
|
}
|
|
|
|
pub fn set_nonblocking(&mut self, val: bool) -> Result<()> {
|
|
if let (instant, ref mut status @ Ok(())) = *self.online.lock().unwrap() {
|
|
if Instant::now().duration_since(instant) >= std::time::Duration::new(60 * 30, 0) {
|
|
*status = Err(MeliError::new("Connection timed out"));
|
|
self.stream = Err(MeliError::new("Connection timed out"));
|
|
}
|
|
}
|
|
if let Ok(ref mut stream) = self.stream {
|
|
if let Ok(_) = stream.set_nonblocking(val) {
|
|
return Ok(());
|
|
}
|
|
}
|
|
let new_stream = ImapStream::new_connection(&self.server_conf);
|
|
if new_stream.is_err() {
|
|
*self.online.lock().unwrap() = (
|
|
Instant::now(),
|
|
Err(new_stream.as_ref().unwrap_err().clone()),
|
|
);
|
|
} else {
|
|
*self.online.lock().unwrap() = (Instant::now(), Ok(()));
|
|
}
|
|
let (capabilities, mut stream) = new_stream?;
|
|
let ret = stream.set_nonblocking(val);
|
|
if ret.is_ok() {
|
|
self.stream = Ok(stream);
|
|
self.capabilities = capabilities;
|
|
}
|
|
ret
|
|
}
|
|
}
|
|
|
|
pub struct ImapBlockingConnection {
|
|
buf: [u8; 1024],
|
|
result: Vec<u8>,
|
|
prev_res_length: usize,
|
|
pub conn: ImapConnection,
|
|
err: Option<String>,
|
|
}
|
|
|
|
impl From<ImapConnection> for ImapBlockingConnection {
|
|
fn from(mut conn: ImapConnection) -> Self {
|
|
conn.set_nonblocking(false)
|
|
.expect("set_nonblocking call failed");
|
|
conn.stream
|
|
.as_mut()
|
|
.map(|s| {
|
|
s.stream
|
|
.get_mut()
|
|
.set_write_timeout(Some(std::time::Duration::new(5 * 60, 0)))
|
|
.expect("set_write_timeout call failed")
|
|
})
|
|
.expect("set_write_timeout call failed");
|
|
conn.stream
|
|
.as_mut()
|
|
.map(|s| {
|
|
s.stream
|
|
.get_mut()
|
|
.set_read_timeout(Some(std::time::Duration::new(5 * 60, 0)))
|
|
.expect("set_read_timeout call failed")
|
|
})
|
|
.expect("set_read_timeout call failed");
|
|
ImapBlockingConnection {
|
|
buf: [0; 1024],
|
|
conn,
|
|
prev_res_length: 0,
|
|
result: Vec::with_capacity(8 * 1024),
|
|
err: None,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ImapBlockingConnection {
|
|
pub fn into_conn(self) -> ImapConnection {
|
|
self.conn
|
|
}
|
|
|
|
pub fn err(&self) -> Option<&str> {
|
|
self.err.as_ref().map(String::as_str)
|
|
}
|
|
}
|
|
|
|
impl Iterator for ImapBlockingConnection {
|
|
type Item = Vec<u8>;
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
self.result.drain(0..self.prev_res_length);
|
|
self.prev_res_length = 0;
|
|
let ImapBlockingConnection {
|
|
ref mut prev_res_length,
|
|
ref mut result,
|
|
ref mut conn,
|
|
ref mut buf,
|
|
ref mut err,
|
|
} = self;
|
|
loop {
|
|
if conn.stream.is_err() {
|
|
debug!(&conn.stream);
|
|
return None;
|
|
}
|
|
match conn.stream.as_mut().unwrap().stream.read(buf) {
|
|
Ok(0) => continue,
|
|
Ok(b) => {
|
|
result.extend_from_slice(&buf[0..b]);
|
|
debug!(unsafe { std::str::from_utf8_unchecked(result) });
|
|
if let Some(pos) = result.find(b"\r\n") {
|
|
*prev_res_length = pos + b"\r\n".len();
|
|
return Some(result[0..*prev_res_length].to_vec());
|
|
}
|
|
}
|
|
Err(e) => {
|
|
debug!(&conn.stream);
|
|
debug!(&e);
|
|
*err = Some(e.to_string());
|
|
return None;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn lookup_ipv4(host: &str, port: u16) -> Result<SocketAddr> {
|
|
use std::net::ToSocketAddrs;
|
|
|
|
let addrs = (host, port).to_socket_addrs()?;
|
|
for addr in addrs {
|
|
if let SocketAddr::V4(_) = addr {
|
|
return Ok(addr);
|
|
}
|
|
}
|
|
|
|
Err(MeliError::new("Cannot lookup address"))
|
|
}
|