231 lines
8.1 KiB
Rust
231 lines
8.1 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::*;
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use crate::backends::BackendOp;
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use crate::email::*;
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use crate::error::{MeliError, Result};
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use std::cell::Cell;
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use std::sync::{Arc, Mutex};
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/// `BackendOp` implementor for Imap
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#[derive(Debug, Clone)]
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pub struct ImapOp {
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uid: usize,
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bytes: Option<String>,
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headers: Option<String>,
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body: Option<String>,
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mailbox_path: String,
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flags: Cell<Option<Flag>>,
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connection: Arc<Mutex<ImapConnection>>,
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uid_store: Arc<UIDStore>,
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tag_index: Arc<RwLock<BTreeMap<u64, String>>>,
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}
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impl ImapOp {
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pub fn new(
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uid: usize,
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mailbox_path: String,
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connection: Arc<Mutex<ImapConnection>>,
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uid_store: Arc<UIDStore>,
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tag_index: Arc<RwLock<BTreeMap<u64, String>>>,
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) -> Self {
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ImapOp {
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uid,
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connection,
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bytes: None,
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headers: None,
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body: None,
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mailbox_path,
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flags: Cell::new(None),
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uid_store,
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tag_index,
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}
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}
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}
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impl BackendOp for ImapOp {
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fn description(&self) -> String {
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unimplemented!();
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}
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fn as_bytes(&mut self) -> Result<&[u8]> {
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if self.bytes.is_none() {
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let mut bytes_cache = self.uid_store.byte_cache.lock()?;
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let cache = bytes_cache.entry(self.uid).or_default();
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if cache.bytes.is_some() {
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self.bytes = cache.bytes.clone();
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} else {
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drop(cache);
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drop(bytes_cache);
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let mut response = String::with_capacity(8 * 1024);
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{
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let mut conn = self.connection.lock().unwrap();
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conn.send_command(format!("SELECT \"{}\"", &self.mailbox_path,).as_bytes())?;
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conn.read_response(&mut response)?;
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conn.send_command(format!("UID FETCH {} (FLAGS RFC822)", self.uid).as_bytes())?;
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conn.read_response(&mut response)?;
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}
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debug!(
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"fetch response is {} bytes and {} lines",
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response.len(),
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response.lines().collect::<Vec<&str>>().len()
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);
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let UidFetchResponse {
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uid, flags, body, ..
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} = protocol_parser::uid_fetch_response(&response)?.1;
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assert_eq!(uid, self.uid);
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assert!(body.is_some());
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let mut bytes_cache = self.uid_store.byte_cache.lock()?;
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let cache = bytes_cache.entry(self.uid).or_default();
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if let Some((flags, _)) = flags {
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self.flags.set(Some(flags));
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cache.flags = Some(flags);
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}
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cache.bytes =
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Some(unsafe { std::str::from_utf8_unchecked(body.unwrap()).to_string() });
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self.bytes = cache.bytes.clone();
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}
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}
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Ok(self.bytes.as_ref().unwrap().as_bytes())
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}
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fn fetch_flags(&self) -> Flag {
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if self.flags.get().is_some() {
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return self.flags.get().unwrap();
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}
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let mut bytes_cache = self.uid_store.byte_cache.lock().unwrap();
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let cache = bytes_cache.entry(self.uid).or_default();
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if cache.flags.is_some() {
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self.flags.set(cache.flags);
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} else {
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let mut response = String::with_capacity(8 * 1024);
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let mut conn = self.connection.lock().unwrap();
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conn.send_command(format!("EXAMINE \"{}\"", &self.mailbox_path,).as_bytes())
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.unwrap();
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conn.read_response(&mut response).unwrap();
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conn.send_command(format!("UID FETCH {} FLAGS", self.uid).as_bytes())
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.unwrap();
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conn.read_response(&mut response).unwrap();
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debug!(
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"fetch response is {} bytes and {} lines",
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response.len(),
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response.lines().collect::<Vec<&str>>().len()
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);
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match protocol_parser::uid_fetch_flags_response(response.as_bytes())
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.to_full_result()
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.map_err(MeliError::from)
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{
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Ok(v) => {
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if v.len() != 1 {
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debug!("responses len is {}", v.len());
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/* TODO: Trigger cache invalidation here. */
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panic!(format!("message with UID {} was not found", self.uid));
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}
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let (uid, (flags, _)) = v[0];
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assert_eq!(uid, self.uid);
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cache.flags = Some(flags);
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self.flags.set(Some(flags));
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}
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Err(e) => Err(e).unwrap(),
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}
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}
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self.flags.get().unwrap()
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}
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fn set_flag(&mut self, _envelope: &mut Envelope, f: Flag, value: bool) -> Result<()> {
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let mut flags = self.fetch_flags();
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flags.set(f, value);
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let mut response = String::with_capacity(8 * 1024);
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let mut conn = self.connection.lock().unwrap();
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conn.send_command(format!("SELECT \"{}\"", &self.mailbox_path,).as_bytes())?;
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conn.read_response(&mut response)?;
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debug!(&response);
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conn.send_command(
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format!(
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"UID STORE {} FLAGS.SILENT ({})",
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self.uid,
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flags_to_imap_list!(flags)
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)
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.as_bytes(),
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)?;
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conn.read_response(&mut response)?;
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debug!(&response);
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match protocol_parser::uid_fetch_flags_response(response.as_bytes())
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.to_full_result()
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.map_err(MeliError::from)
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{
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Ok(v) => {
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if v.len() == 1 {
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debug!("responses len is {}", v.len());
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let (uid, (flags, _)) = v[0];
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assert_eq!(uid, self.uid);
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self.flags.set(Some(flags));
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}
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}
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Err(e) => Err(e).unwrap(),
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}
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let mut bytes_cache = self.uid_store.byte_cache.lock()?;
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let cache = bytes_cache.entry(self.uid).or_default();
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cache.flags = Some(flags);
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Ok(())
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}
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fn set_tag(&mut self, envelope: &mut Envelope, tag: String, value: bool) -> Result<()> {
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let mut response = String::with_capacity(8 * 1024);
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let mut conn = self.connection.lock().unwrap();
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conn.send_command(format!("SELECT \"{}\"", &self.mailbox_path,).as_bytes())?;
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conn.read_response(&mut response)?;
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conn.send_command(
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format!(
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"UID STORE {} {}FLAGS.SILENT ({})",
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self.uid,
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if value { "+" } else { "-" },
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&tag
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)
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.as_bytes(),
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)?;
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conn.read_response(&mut response)?;
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protocol_parser::uid_fetch_flags_response(response.as_bytes())
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.to_full_result()
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.map_err(MeliError::from)?;
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let hash = tag_hash!(tag);
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if value {
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self.tag_index.write().unwrap().insert(hash, tag);
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} else {
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self.tag_index.write().unwrap().remove(&hash);
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}
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if !envelope.labels().iter().any(|&h_| h_ == hash) {
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if value {
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envelope.labels_mut().push(hash);
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}
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}
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if !value {
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if let Some(pos) = envelope.labels().iter().position(|&h_| h_ == hash) {
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envelope.labels_mut().remove(pos);
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}
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}
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Ok(())
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}
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}
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