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Send and apply MDNs to self (#7005)

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We currently synchronize "seen" status of messages by setting `\Seen` flag on IMAP and then looking
for new `\Seen` flags using `CONDSTORE` IMAP extension. This approach has multiple disadvantages:
- It requires that the server supports `CONDSTORE` extension. For example Maddy does not support
  CONDSTORE yet: https://github.com/foxcpp/maddy/issues/727
- It leaks the seen status to the server without any encryption.
- It requires more than just store-and-forward queues and prevents replacing IMAP with simpler
  protocols like POP3 or UUCP or some HTTP-based API for queue polling.

A simpler approach is to send MDNs to self when `Config::BccSelf` (aka multidevice) is enabled,
regardless of whether the message requested and MDN. If MDN was requested and we have MDNs enabled,
then also send to the message sender, but MDN to self is sent regardless of whether read receipts
are actually enabled.

`sync_seen_flags()` and `CONDSTORE` check is better completely removed, maybe after one
release. `store_seen_flags_on_imap()` can be kept for unencrypted non-chat messages.

One potential problem with sending MDNs is that it may trigger ratelimits on some providers and
count as another recipient.
This commit is contained in:
iequidoo
2026-01-17 01:46:15 -03:00
committed by iequidoo
parent 659d21aa9d
commit a67a5299bf
7 changed files with 184 additions and 72 deletions
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32
src/message.rs
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@@ -452,6 +452,7 @@ pub struct Message {
pub(crate) is_dc_message: MessengerMessage,
pub(crate) original_msg_id: MsgId,
pub(crate) mime_modified: bool,
pub(crate) chat_visibility: ChatVisibility,
pub(crate) chat_blocked: Blocked,
pub(crate) location_id: u32,
pub(crate) error: Option<String>,
@@ -525,6 +526,7 @@ impl Message {
m.param AS param,
m.hidden AS hidden,
m.location_id AS location,
c.archived AS visibility,
c.blocked AS blocked
FROM msgs m
LEFT JOIN chats c ON c.id=m.chat_id
@@ -583,6 +585,7 @@ impl Message {
param: row.get::<_, String>("param")?.parse().unwrap_or_default(),
hidden: row.get("hidden")?,
location_id: row.get("location")?,
chat_visibility: row.get::<_, Option<_>>("visibility")?.unwrap_or_default(),
chat_blocked: row
.get::<_, Option<Blocked>>("blocked")?
.unwrap_or_default(),
@@ -1837,6 +1840,7 @@ pub async fn markseen_msgs(context: &Context, msg_ids: Vec<MsgId>) -> Result<()>
m.param AS param,
m.from_id AS from_id,
m.rfc724_mid AS rfc724_mid,
m.hidden AS hidden,
c.archived AS archived,
c.blocked AS blocked
FROM msgs m LEFT JOIN chats c ON c.id=m.chat_id
@@ -1848,6 +1852,7 @@ pub async fn markseen_msgs(context: &Context, msg_ids: Vec<MsgId>) -> Result<()>
let param: Params = row.get::<_, String>("param")?.parse().unwrap_or_default();
let from_id: ContactId = row.get("from_id")?;
let rfc724_mid: String = row.get("rfc724_mid")?;
let hidden: bool = row.get("hidden")?;
let visibility: ChatVisibility = row.get("archived")?;
let blocked: Option<Blocked> = row.get("blocked")?;
let ephemeral_timer: EphemeralTimer = row.get("ephemeral_timer")?;
@@ -1859,6 +1864,7 @@ pub async fn markseen_msgs(context: &Context, msg_ids: Vec<MsgId>) -> Result<()>
param,
from_id,
rfc724_mid,
hidden,
visibility,
blocked.unwrap_or_default(),
),
@@ -1891,6 +1897,7 @@ pub async fn markseen_msgs(context: &Context, msg_ids: Vec<MsgId>) -> Result<()>
curr_param,
curr_from_id,
curr_rfc724_mid,
curr_hidden,
curr_visibility,
curr_blocked,
),
@@ -1903,8 +1910,9 @@ pub async fn markseen_msgs(context: &Context, msg_ids: Vec<MsgId>) -> Result<()>
markseen_on_imap_table(context, &curr_rfc724_mid).await?;
// Read receipts for system messages are never sent. These messages have no place to
// display received read receipt anyway. And since their text is locally generated,
// Read receipts for system messages are never sent to contacts.
// These messages have no place to display received read receipt
// anyway. And since their text is locally generated,
// quoting them is dangerous as it may contain contact names. E.g., for original message
// "Group left by me", a read receipt will quote "Group left by <name>", and the name can
// be a display name stored in address book rather than the name sent in the From field by
@@ -1912,25 +1920,35 @@ pub async fn markseen_msgs(context: &Context, msg_ids: Vec<MsgId>) -> Result<()>
//
// We also don't send read receipts for contact requests.
// Read receipts will not be sent even after accepting the chat.
if curr_blocked == Blocked::Not
let to_id = if curr_blocked == Blocked::Not
&& curr_param.get_bool(Param::WantsMdn).unwrap_or_default()
&& curr_param.get_cmd() == SystemMessage::Unknown
&& context.should_send_mdns().await?
{
Some(curr_from_id)
} else if context.get_config_bool(Config::BccSelf).await? {
Some(ContactId::SELF)
} else {
None
};
if let Some(to_id) = to_id {
context
.sql
.execute(
"INSERT INTO smtp_mdns (msg_id, from_id, rfc724_mid) VALUES(?, ?, ?)",
(id, curr_from_id, curr_rfc724_mid),
(id, to_id, curr_rfc724_mid),
)
.await
.context("failed to insert into smtp_mdns")?;
context.scheduler.interrupt_smtp().await;
}
updated_chat_ids.insert(curr_chat_id);
if !curr_hidden {
updated_chat_ids.insert(curr_chat_id);
}
}
archived_chats_maybe_noticed |=
curr_state == MessageState::InFresh && curr_visibility == ChatVisibility::Archived;
archived_chats_maybe_noticed |= curr_state == MessageState::InFresh
&& !curr_hidden
&& curr_visibility == ChatVisibility::Archived;
}
for updated_chat_id in updated_chat_ids {