643 lines
22 KiB
Rust
643 lines
22 KiB
Rust
/*
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* meli - nntp module.
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*
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* Copyright 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 crate::get_conf_val;
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use crate::get_path_hash;
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use smallvec::SmallVec;
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#[macro_use]
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mod protocol_parser;
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pub use protocol_parser::*;
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mod mailbox;
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pub use mailbox::*;
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mod operations;
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pub use operations::*;
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mod connection;
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pub use connection::*;
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use crate::backends::*;
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use crate::conf::AccountSettings;
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use crate::email::*;
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use crate::error::{MeliError, Result, ResultIntoMeliError};
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use futures::lock::Mutex as FutureMutex;
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use futures::stream::Stream;
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use std::collections::{hash_map::DefaultHasher, BTreeMap, BTreeSet, HashMap, HashSet};
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use std::future::Future;
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use std::hash::Hasher;
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use std::pin::Pin;
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use std::str::FromStr;
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use std::sync::{Arc, Mutex, RwLock};
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use std::time::Instant;
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pub type UID = usize;
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pub static SUPPORTED_CAPABILITIES: &[&str] = &[
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#[cfg(feature = "deflate_compression")]
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"COMPRESS DEFLATE",
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"VERSION 2",
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];
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#[derive(Debug, Clone)]
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pub struct NntpServerConf {
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pub server_hostname: String,
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pub server_username: String,
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pub server_password: String,
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pub server_port: u16,
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pub use_starttls: bool,
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pub use_tls: bool,
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pub require_auth: bool,
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pub danger_accept_invalid_certs: bool,
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pub extension_use: NntpExtensionUse,
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}
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type Capabilities = HashSet<String>;
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#[derive(Debug)]
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pub struct UIDStore {
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account_hash: AccountHash,
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account_name: Arc<String>,
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offline_cache: bool,
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capabilities: Arc<Mutex<Capabilities>>,
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hash_index: Arc<Mutex<HashMap<EnvelopeHash, (UID, MailboxHash)>>>,
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uid_index: Arc<Mutex<HashMap<(MailboxHash, UID), EnvelopeHash>>>,
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mailboxes: Arc<FutureMutex<HashMap<MailboxHash, NntpMailbox>>>,
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is_online: Arc<Mutex<(Instant, Result<()>)>>,
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event_consumer: BackendEventConsumer,
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}
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impl UIDStore {
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fn new(
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account_hash: AccountHash,
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account_name: Arc<String>,
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event_consumer: BackendEventConsumer,
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) -> Self {
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UIDStore {
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account_hash,
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account_name,
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event_consumer,
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offline_cache: false,
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capabilities: Default::default(),
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hash_index: Default::default(),
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uid_index: Default::default(),
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mailboxes: Arc::new(FutureMutex::new(Default::default())),
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is_online: Arc::new(Mutex::new((
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Instant::now(),
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Err(MeliError::new("Account is uninitialised.")),
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))),
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}
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}
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}
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#[derive(Debug)]
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pub struct NntpType {
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is_subscribed: Arc<IsSubscribedFn>,
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connection: Arc<FutureMutex<NntpConnection>>,
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server_conf: NntpServerConf,
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uid_store: Arc<UIDStore>,
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can_create_flags: Arc<Mutex<bool>>,
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}
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impl MailBackend for NntpType {
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fn capabilities(&self) -> MailBackendCapabilities {
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let mut extensions = self
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.uid_store
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.capabilities
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.lock()
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.unwrap()
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.iter()
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.map(|c| {
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(
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c.to_string(),
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MailBackendExtensionStatus::Unsupported { comment: None },
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)
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})
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.collect::<Vec<(String, MailBackendExtensionStatus)>>();
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let NntpExtensionUse {
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#[cfg(feature = "deflate_compression")]
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deflate,
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} = self.server_conf.extension_use;
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{
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for (name, status) in extensions.iter_mut() {
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match name.as_str() {
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"COMPRESS DEFLATE" => {
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#[cfg(feature = "deflate_compression")]
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{
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if deflate {
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*status = MailBackendExtensionStatus::Enabled { comment: None };
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} else {
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*status = MailBackendExtensionStatus::Supported {
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comment: Some("Disabled by user configuration"),
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};
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}
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}
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#[cfg(not(feature = "deflate_compression"))]
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{
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*status = MailBackendExtensionStatus::Unsupported {
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comment: Some("melib not compiled with DEFLATE."),
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};
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}
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}
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_ => {
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if SUPPORTED_CAPABILITIES.contains(&name.as_str()) {
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*status = MailBackendExtensionStatus::Enabled { comment: None };
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}
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}
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}
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}
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}
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extensions.sort_by(|a, b| a.0.cmp(&b.0));
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MailBackendCapabilities {
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is_async: true,
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is_remote: true,
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supports_search: false,
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extensions: Some(extensions),
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supports_tags: false,
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supports_submission: false,
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}
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}
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fn fetch(
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&mut self,
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mailbox_hash: MailboxHash,
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) -> Result<Pin<Box<dyn Stream<Item = Result<Vec<Envelope>>> + Send + 'static>>> {
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let mut state = FetchState {
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mailbox_hash,
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uid_store: self.uid_store.clone(),
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connection: self.connection.clone(),
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high_low_total: None,
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};
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Ok(Box::pin(async_stream::try_stream! {
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{
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let f = &state.uid_store.mailboxes.lock().await[&state.mailbox_hash];
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f.exists.lock().unwrap().clear();
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f.unseen.lock().unwrap().clear();
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};
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loop {
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if let Some(ret) = state.fetch_envs().await? {
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yield ret;
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continue;
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}
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break;
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}
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}))
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}
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fn refresh(&mut self, _mailbox_hash: MailboxHash) -> ResultFuture<()> {
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Err(MeliError::new("Unimplemented."))
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}
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fn mailboxes(&self) -> ResultFuture<HashMap<MailboxHash, Mailbox>> {
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let uid_store = self.uid_store.clone();
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let connection = self.connection.clone();
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Ok(Box::pin(async move {
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NntpType::nntp_mailboxes(&connection).await?;
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let mailboxes_lck = uid_store.mailboxes.lock().await;
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let ret = mailboxes_lck
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.iter()
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.map(|(h, f)| (*h, Box::new(Clone::clone(f)) as Mailbox))
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.collect();
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Ok(ret)
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}))
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}
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fn is_online(&self) -> ResultFuture<()> {
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let connection = self.connection.clone();
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Ok(Box::pin(async move {
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match timeout(std::time::Duration::from_secs(3), connection.lock()).await {
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Ok(mut conn) => {
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debug!("is_online");
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match debug!(timeout(std::time::Duration::from_secs(3), conn.connect()).await) {
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Ok(Ok(())) => Ok(()),
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Err(err) | Ok(Err(err)) => {
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conn.stream = Err(err.clone());
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debug!(conn.connect().await)
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}
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}
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}
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Err(err) => Err(err),
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}
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}))
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}
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fn watch(&self) -> ResultFuture<()> {
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Err(MeliError::new("Unimplemented."))
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}
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fn operation(&self, env_hash: EnvelopeHash) -> Result<Box<dyn BackendOp>> {
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let (uid, mailbox_hash) = if let Some(v) =
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self.uid_store.hash_index.lock().unwrap().get(&env_hash)
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{
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*v
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} else {
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return Err(MeliError::new(
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"Message not found in local cache, it might have been deleted before you requested it."
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));
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};
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Ok(Box::new(NntpOp::new(
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uid,
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mailbox_hash,
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self.connection.clone(),
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self.uid_store.clone(),
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)))
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}
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fn save(
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&self,
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_bytes: Vec<u8>,
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_mailbox_hash: MailboxHash,
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_flags: Option<Flag>,
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) -> ResultFuture<()> {
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Err(MeliError::new("NNTP doesn't support saving."))
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}
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fn copy_messages(
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&mut self,
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_env_hashes: EnvelopeHashBatch,
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_source_mailbox_hash: MailboxHash,
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_destination_mailbox_hash: MailboxHash,
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_move_: bool,
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) -> ResultFuture<()> {
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Err(MeliError::new("NNTP doesn't support copying/moving."))
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}
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fn set_flags(
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&mut self,
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_env_hashes: EnvelopeHashBatch,
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_mailbox_hash: MailboxHash,
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_flags: SmallVec<[(std::result::Result<Flag, String>, bool); 8]>,
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) -> ResultFuture<()> {
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Err(MeliError::new("NNTP doesn't support flags."))
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}
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fn delete_messages(
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&mut self,
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_env_hashes: EnvelopeHashBatch,
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_mailbox_hash: MailboxHash,
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) -> ResultFuture<()> {
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Err(MeliError::new("NNTP doesn't support deletion."))
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}
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fn tags(&self) -> Option<Arc<RwLock<BTreeMap<u64, String>>>> {
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None
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}
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fn as_any(&self) -> &dyn Any {
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self
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}
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fn as_any_mut(&mut self) -> &mut dyn Any {
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self
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}
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fn create_mailbox(
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&mut self,
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_path: String,
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) -> ResultFuture<(MailboxHash, HashMap<MailboxHash, Mailbox>)> {
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Err(MeliError::new("Unimplemented."))
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}
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fn delete_mailbox(
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&mut self,
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_mailbox_hash: MailboxHash,
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) -> ResultFuture<HashMap<MailboxHash, Mailbox>> {
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Err(MeliError::new("Unimplemented."))
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}
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fn set_mailbox_subscription(
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&mut self,
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_mailbox_hash: MailboxHash,
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_new_val: bool,
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) -> ResultFuture<()> {
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Err(MeliError::new("Unimplemented."))
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}
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fn rename_mailbox(
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&mut self,
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_mailbox_hash: MailboxHash,
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_new_path: String,
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) -> ResultFuture<Mailbox> {
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Err(MeliError::new("Unimplemented."))
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}
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fn set_mailbox_permissions(
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&mut self,
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_mailbox_hash: MailboxHash,
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_val: crate::backends::MailboxPermissions,
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) -> ResultFuture<()> {
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Err(MeliError::new("Unimplemented."))
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}
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fn search(
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&self,
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_query: crate::search::Query,
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_mailbox_hash: Option<MailboxHash>,
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) -> ResultFuture<SmallVec<[EnvelopeHash; 512]>> {
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Err(MeliError::new("Unimplemented."))
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}
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}
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impl NntpType {
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pub fn new(
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s: &AccountSettings,
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is_subscribed: Box<dyn Fn(&str) -> bool + Send + Sync>,
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event_consumer: BackendEventConsumer,
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) -> Result<Box<dyn MailBackend>> {
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let server_hostname = get_conf_val!(s["server_hostname"])?;
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/*let server_username = get_conf_val!(s["server_username"], "")?;
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let server_password = if !s.extra.contains_key("server_password_command") {
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get_conf_val!(s["server_password"], "")?.to_string()
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} else {
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let invocation = get_conf_val!(s["server_password_command"])?;
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let output = std::process::Command::new("sh")
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.args(&["-c", invocation])
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.stdin(std::process::Stdio::piped())
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.stdout(std::process::Stdio::piped())
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.stderr(std::process::Stdio::piped())
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.output()?;
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if !output.status.success() {
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return Err(MeliError::new(format!(
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"({}) server_password_command `{}` returned {}: {}",
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s.name,
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get_conf_val!(s["server_password_command"])?,
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output.status,
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String::from_utf8_lossy(&output.stderr)
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)));
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}
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std::str::from_utf8(&output.stdout)?.trim_end().to_string()
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};
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*/
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let server_port = get_conf_val!(s["server_port"], 119)?;
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let use_tls = get_conf_val!(s["use_tls"], server_port == 563)?;
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let use_starttls = use_tls && get_conf_val!(s["use_starttls"], !(server_port == 563))?;
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let danger_accept_invalid_certs: bool =
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get_conf_val!(s["danger_accept_invalid_certs"], false)?;
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let require_auth = get_conf_val!(s["require_auth"], true)?;
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let server_conf = NntpServerConf {
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server_hostname: server_hostname.to_string(),
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server_username: if require_auth {
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get_conf_val!(s["server_username"])?.to_string()
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} else {
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get_conf_val!(s["server_username"], String::new())?
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},
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server_password: if require_auth {
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get_conf_val!(s["server_password"])?.to_string()
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} else {
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get_conf_val!(s["server_password"], String::new())?
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},
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require_auth,
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server_port,
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use_tls,
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use_starttls,
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danger_accept_invalid_certs,
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extension_use: NntpExtensionUse {
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#[cfg(feature = "deflate_compression")]
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deflate: get_conf_val!(s["use_deflate"], true)?,
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},
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};
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let account_hash = {
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let mut hasher = DefaultHasher::new();
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hasher.write(s.name.as_bytes());
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hasher.finish()
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};
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let account_name = Arc::new(s.name().to_string());
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let mut mailboxes = HashMap::default();
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for (k, _f) in s.mailboxes.iter() {
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let mailbox_hash = get_path_hash!(&k);
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mailboxes.insert(
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mailbox_hash,
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NntpMailbox {
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hash: mailbox_hash,
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nntp_path: k.to_string(),
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high_watermark: Arc::new(Mutex::new(0)),
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low_watermark: Arc::new(Mutex::new(0)),
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exists: Default::default(),
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unseen: Default::default(),
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},
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);
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}
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if mailboxes.is_empty() {
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return Err(MeliError::new(format!(
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"{} has no newsgroups configured.",
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account_name
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)));
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}
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let uid_store: Arc<UIDStore> = Arc::new(UIDStore {
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offline_cache: false, //get_conf_val!(s["X_header_caching"], false)?,
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mailboxes: Arc::new(FutureMutex::new(mailboxes)),
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..UIDStore::new(account_hash, account_name, event_consumer)
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});
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let connection = NntpConnection::new_connection(&server_conf, uid_store.clone());
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Ok(Box::new(NntpType {
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server_conf,
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is_subscribed: Arc::new(IsSubscribedFn(is_subscribed)),
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can_create_flags: Arc::new(Mutex::new(false)),
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connection: Arc::new(FutureMutex::new(connection)),
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uid_store,
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}))
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}
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pub async fn nntp_mailboxes(connection: &Arc<FutureMutex<NntpConnection>>) -> Result<()> {
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let mut res = String::with_capacity(8 * 1024);
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let mut conn = connection.lock().await;
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let command = {
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let mailboxes_lck = conn.uid_store.mailboxes.lock().await;
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mailboxes_lck
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.values()
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.fold("LIST ACTIVE ".to_string(), |mut acc, x| {
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if acc.len() != "LIST ACTIVE ".len() {
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acc.push(',');
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}
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acc.push_str(x.name());
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acc
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})
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};
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conn.send_command(command.as_bytes()).await?;
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conn.read_response(&mut res, true, &["215 "])
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.await
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.chain_err_summary(|| {
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format!(
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"Could not get newsgroups {}: expected LIST ACTIVE response but got: {}",
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&conn.uid_store.account_name, res
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)
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})?;
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debug!(&res);
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let mut mailboxes_lck = conn.uid_store.mailboxes.lock().await;
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for l in res.split_rn().skip(1) {
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let s = l.split_whitespace().collect::<SmallVec<[&str; 4]>>();
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if s.len() != 3 {
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continue;
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}
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let mailbox_hash = get_path_hash!(&s[0]);
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mailboxes_lck.entry(mailbox_hash).and_modify(|m| {
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*m.high_watermark.lock().unwrap() = usize::from_str(s[1]).unwrap_or(0);
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*m.low_watermark.lock().unwrap() = usize::from_str(s[2]).unwrap_or(0);
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});
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}
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Ok(())
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}
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pub fn validate_config(s: &AccountSettings) -> Result<()> {
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get_conf_val!(s["server_hostname"])?;
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get_conf_val!(s["server_username"], String::new())?;
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if !s.extra.contains_key("server_password_command") {
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get_conf_val!(s["server_password"], String::new())?;
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} else if s.extra.contains_key("server_password") {
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return Err(MeliError::new(format!(
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"Configuration error ({}): both server_password and server_password_command are set, cannot choose",
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s.name.as_str(),
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)));
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}
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let server_port = get_conf_val!(s["server_port"], 119)?;
|
|
let use_tls = get_conf_val!(s["use_tls"], server_port == 563)?;
|
|
let use_starttls = get_conf_val!(s["use_starttls"], !(server_port == 563))?;
|
|
if !use_tls && use_starttls {
|
|
return Err(MeliError::new(format!(
|
|
"Configuration error ({}): incompatible use_tls and use_starttls values: use_tls = false, use_starttls = true",
|
|
s.name.as_str(),
|
|
)));
|
|
}
|
|
#[cfg(feature = "deflate_compression")]
|
|
get_conf_val!(s["use_deflate"], true)?;
|
|
#[cfg(not(feature = "deflate_compression"))]
|
|
if s.extra.contains_key("use_deflate") {
|
|
return Err(MeliError::new(format!(
|
|
"Configuration error ({}): setting `use_deflate` is set but this version of meli isn't compiled with DEFLATE support.",
|
|
s.name.as_str(),
|
|
)));
|
|
}
|
|
get_conf_val!(s["danger_accept_invalid_certs"], false)?;
|
|
Ok(())
|
|
}
|
|
|
|
pub fn capabilities(&self) -> Vec<String> {
|
|
self.uid_store
|
|
.capabilities
|
|
.lock()
|
|
.unwrap()
|
|
.iter()
|
|
.map(|c| c.clone())
|
|
.collect::<Vec<String>>()
|
|
}
|
|
}
|
|
|
|
struct FetchState {
|
|
mailbox_hash: MailboxHash,
|
|
connection: Arc<FutureMutex<NntpConnection>>,
|
|
uid_store: Arc<UIDStore>,
|
|
high_low_total: Option<(usize, usize, usize)>,
|
|
}
|
|
|
|
impl FetchState {
|
|
async fn fetch_envs(&mut self) -> Result<Option<Vec<Envelope>>> {
|
|
let FetchState {
|
|
mailbox_hash,
|
|
ref connection,
|
|
ref uid_store,
|
|
ref mut high_low_total,
|
|
} = self;
|
|
let mailbox_hash = *mailbox_hash;
|
|
let mut res = String::with_capacity(8 * 1024);
|
|
let mut conn = connection.lock().await;
|
|
if high_low_total.is_none() {
|
|
conn.select_group(mailbox_hash, true, &mut res).await?;
|
|
/*
|
|
* Parameters
|
|
group Name of newsgroup
|
|
number Estimated number of articles in the group
|
|
low Reported low water mark
|
|
high Reported high water mark
|
|
*/
|
|
let s = res.split_whitespace().collect::<SmallVec<[&str; 6]>>();
|
|
let path = conn.uid_store.mailboxes.lock().await[&mailbox_hash]
|
|
.name()
|
|
.to_string();
|
|
if s.len() != 5 {
|
|
return Err(MeliError::new(format!(
|
|
"{} Could not select newsgroup {}: expected GROUP response but got: {}",
|
|
&uid_store.account_name, path, res
|
|
)));
|
|
}
|
|
let total = usize::from_str(&s[1]).unwrap_or(0);
|
|
let _low = usize::from_str(&s[2]).unwrap_or(0);
|
|
let high = usize::from_str(&s[3]).unwrap_or(0);
|
|
*high_low_total = Some((high, _low, total));
|
|
{
|
|
let f = &uid_store.mailboxes.lock().await[&mailbox_hash];
|
|
f.exists.lock().unwrap().set_not_yet_seen(total);
|
|
f.unseen.lock().unwrap().set_not_yet_seen(total);
|
|
};
|
|
}
|
|
let (high, low, _) = high_low_total.unwrap();
|
|
if high <= low {
|
|
return Ok(None);
|
|
}
|
|
const CHUNK_SIZE: usize = 100;
|
|
let new_low = std::cmp::max(low, high.saturating_sub(CHUNK_SIZE));
|
|
high_low_total.as_mut().unwrap().0 = new_low;
|
|
|
|
conn.send_command(format!("OVER {}-{}", new_low, high).as_bytes())
|
|
.await?;
|
|
conn.read_response(&mut res, true, command_to_replycodes("OVER"))
|
|
.await
|
|
.chain_err_summary(|| {
|
|
format!(
|
|
"{} Could not select newsgroup: expected OVER response but got: {}",
|
|
&uid_store.account_name, res
|
|
)
|
|
})?;
|
|
let mut ret = Vec::with_capacity(high - new_low);
|
|
//hash_index: Arc<Mutex<HashMap<EnvelopeHash, (UID, MailboxHash)>>>,
|
|
//uid_index: Arc<Mutex<HashMap<(MailboxHash, UID), EnvelopeHash>>>,
|
|
{
|
|
let mut hash_index_lck = uid_store.hash_index.lock().unwrap();
|
|
let mut uid_index_lck = uid_store.uid_index.lock().unwrap();
|
|
for l in res.split_rn().skip(1) {
|
|
let (_, (num, env)) = protocol_parser::over_article(&l)?;
|
|
hash_index_lck.insert(env.hash(), (num, mailbox_hash));
|
|
uid_index_lck.insert((mailbox_hash, num), env.hash());
|
|
ret.push(env);
|
|
}
|
|
}
|
|
{
|
|
let hash_set: BTreeSet<EnvelopeHash> = ret.iter().map(|env| env.hash()).collect();
|
|
let f = &uid_store.mailboxes.lock().await[&mailbox_hash];
|
|
f.exists
|
|
.lock()
|
|
.unwrap()
|
|
.insert_existing_set(hash_set.clone());
|
|
f.unseen.lock().unwrap().insert_existing_set(hash_set);
|
|
};
|
|
Ok(Some(ret))
|
|
}
|
|
}
|
|
|
|
use futures::future::{self, Either};
|
|
|
|
async fn timeout<O>(dur: std::time::Duration, f: impl Future<Output = O>) -> Result<O> {
|
|
futures::pin_mut!(f);
|
|
match future::select(f, smol::Timer::after(dur)).await {
|
|
Either::Left((out, _)) => Ok(out),
|
|
Either::Right(_) => {
|
|
Err(MeliError::new("Timedout").set_kind(crate::error::ErrorKind::Network))
|
|
}
|
|
}
|
|
}
|