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use std::collections::HashMap;
use std::sync::{Arc, Weak};
use std::time::Duration;
use anyhow::Result;
use k2v_client::{CausalityToken, K2vClient, K2vValue};
use rusoto_s3::{PutObjectRequest, S3Client, S3};
use tokio::sync::watch;
use tracing::error;
use crate::cryptoblob;
use crate::login::{Credentials, PublicCredentials};
use crate::mail::mailbox::Mailbox;
use crate::mail::uidindex::ImapUidvalidity;
use crate::mail::unique_ident::*;
use crate::mail::user::User;
use crate::time::now_msec;
const INCOMING_PK: &str = "incoming";
const INCOMING_LOCK_SK: &str = "lock";
const INCOMING_WATCH_SK: &str = "watch";
pub async fn incoming_mail_watch_process(
user: Weak<User>,
creds: Credentials,
rx_inbox_id: watch::Receiver<Option<(UniqueIdent, ImapUidvalidity)>>,
) {
if let Err(e) = incoming_mail_watch_process_internal(user, creds, rx_inbox_id).await {
error!("Error in incoming mail watch process: {}", e);
}
}
async fn incoming_mail_watch_process_internal(
user: Weak<User>,
creds: Credentials,
mut rx_inbox_id: watch::Receiver<Option<(UniqueIdent, ImapUidvalidity)>>,
) -> Result<()> {
let mut lock_held = k2v_lock_loop(creds.k2v_client()?, INCOMING_PK, INCOMING_LOCK_SK);
let k2v = creds.k2v_client()?;
let s3 = creds.s3_client()?;
let mut inbox: Option<Arc<Mailbox>> = None;
let mut prev_ct: Option<CausalityToken> = None;
loop {
let new_mail = if *lock_held.borrow() {
tokio::select! {
ct = wait_new_mail(&k2v, &prev_ct) => Some(ct),
_ = tokio::time::sleep(Duration::from_secs(300)) => prev_ct.take(),
_ = lock_held.changed() => None,
_ = rx_inbox_id.changed() => None,
}
} else {
tokio::select! {
_ = lock_held.changed() => None,
_ = rx_inbox_id.changed() => None,
}
};
if let Some(user) = Weak::upgrade(&user) {
eprintln!("User still available");
// If INBOX no longer is same mailbox, open new mailbox
let inbox_id = rx_inbox_id.borrow().clone();
if let Some((id, uidvalidity)) = inbox_id {
if Some(id) != inbox.as_ref().map(|b| b.id) {
match user.open_mailbox_by_id(id, uidvalidity).await {
Ok(mb) => {
inbox = mb;
}
Err(e) => {
inbox = None;
error!("Error when opening inbox ({}): {}", id, e);
tokio::time::sleep(Duration::from_secs(30)).await;
}
}
}
}
// If we were able to open INBOX, and we have mail (implies lock is held),
// fetch new mail
if let (Some(inbox), Some(new_ct)) = (&inbox, new_mail) {
match handle_incoming_mail(&user, &s3, inbox).await {
Ok(()) => {
prev_ct = Some(new_ct);
}
Err(e) => {
error!("Could not fetch incoming mail: {}", e);
tokio::time::sleep(Duration::from_secs(30)).await;
}
}
}
} else {
eprintln!("User no longer available, exiting incoming loop.");
break;
}
}
drop(rx_inbox_id);
Ok(())
}
async fn wait_new_mail(k2v: &K2vClient, prev_ct: &Option<CausalityToken>) -> CausalityToken {
loop {
if let Some(ct) = &prev_ct {
match k2v
.poll_item(INCOMING_PK, INCOMING_WATCH_SK, ct.clone(), None)
.await
{
Err(e) => {
error!("Error when waiting for incoming watch: {}, sleeping", e);
tokio::time::sleep(Duration::from_secs(30)).await;
}
Ok(None) => continue,
Ok(Some(cv)) => {
return cv.causality;
}
}
} else {
match k2v.read_item(INCOMING_PK, INCOMING_WATCH_SK).await {
Err(k2v_client::Error::NotFound) => {
if let Err(e) = k2v
.insert_item(INCOMING_PK, INCOMING_WATCH_SK, vec![0u8], None)
.await
{
error!("Error when waiting for incoming watch: {}, sleeping", e);
tokio::time::sleep(Duration::from_secs(30)).await;
}
}
Err(e) => {
error!("Error when waiting for incoming watch: {}, sleeping", e);
tokio::time::sleep(Duration::from_secs(30)).await;
}
Ok(cv) => {
return cv.causality;
}
}
}
}
}
async fn handle_incoming_mail(user: &Arc<User>, s3: &S3Client, inbox: &Arc<Mailbox>) -> Result<()> {
unimplemented!()
}
fn k2v_lock_loop(k2v: K2vClient, pk: &'static str, sk: &'static str) -> watch::Receiver<bool> {
let (held_tx, held_rx) = watch::channel(false);
tokio::spawn(async move {
if let Err(e) = k2v_lock_loop_internal(k2v, pk, sk, &held_tx).await {
error!("Error in k2v locking loop: {}", e);
}
let _ = held_tx.send(false);
});
held_rx
}
async fn k2v_lock_loop_internal(
k2v: K2vClient,
pk: &'static str,
sk: &'static str,
held_tx: &watch::Sender<bool>,
) -> Result<()> {
unimplemented!()
}
// ----
pub struct EncryptedMessage {
key: cryptoblob::Key,
encrypted_body: Vec<u8>,
}
impl EncryptedMessage {
pub fn new(body: Vec<u8>) -> Result<Self> {
let key = cryptoblob::gen_key();
let encrypted_body = cryptoblob::seal(&body, &key)?;
Ok(Self {
key,
encrypted_body,
})
}
pub async fn deliver_to(self: Arc<Self>, creds: PublicCredentials) -> Result<()> {
let s3_client = creds.storage.s3_client()?;
let k2v_client = creds.storage.k2v_client()?;
// Get causality token of previous watch key
let watch_ct = match k2v_client.read_item(INCOMING_PK, INCOMING_WATCH_SK).await {
Err(_) => None,
Ok(cv) => Some(cv.causality),
};
// Write mail to encrypted storage
let encrypted_key =
sodiumoxide::crypto::sealedbox::seal(self.key.as_ref(), &creds.public_key);
let key_header = base64::encode(&encrypted_key);
let mut por = PutObjectRequest::default();
por.bucket = creds.storage.bucket.clone();
por.key = format!("incoming/{}", gen_ident().to_string());
por.metadata = Some(
[("Message-Key".to_string(), key_header)]
.into_iter()
.collect::<HashMap<_, _>>(),
);
por.body = Some(self.encrypted_body.clone().into());
s3_client.put_object(por).await?;
// Update watch key to signal new mail
k2v_client
.insert_item(
INCOMING_PK,
INCOMING_WATCH_SK,
gen_ident().0.to_vec(),
watch_ct,
)
.await?;
Ok(())
}
}
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