OXYGENHUB
# 705d11b01a2c oxygenhub / crates / hub / src / notify / mod.rs
3.8 KiB · Rust · last changed Milestone 0.4: issues and notifications 1 month ago source blame history raw
18e381ea Andy McCall ↶ 1 
//! Notifications (hub spec §10): who to tell about an event, the inbox
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//! row, and email when the account asked for it and SMTP is configured.
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use crate::db::{self, accounts::Account, notify as ndb};
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use crate::Shared;
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use std::collections::BTreeSet;
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/// An event worth telling people about.
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pub struct Event<'a> {
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    pub kind: &'a str,
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    pub title: String,
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    pub url: String,
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    pub actor: &'a Account,
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    pub repo_id: i64,
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    /// `issue` or `proposal` and its id, for thread subscribers.
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    pub thread: Option<(&'a str, i64)>,
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    /// Bodies to scan for `@mentions`.
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    pub mention_text: &'a str,
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    /// Accounts to tell whatever their subscriptions (author, assignees).
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    pub direct: Vec<i64>,
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}
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/// `@username` tokens in a text, unique.
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pub fn mentions(text: &str) -> Vec<String> {
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    let re = regex::Regex::new(r"(?:^|[^\w/])@([A-Za-z0-9][A-Za-z0-9._-]{0,63})").unwrap();
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    let mut out = BTreeSet::new();
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    for c in re.captures_iter(text) {
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        out.insert(c[1].trim_end_matches('.').to_string());
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    }
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    out.into_iter().collect()
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}
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/// Deliver an event: subscribers of the thread, watchers of the
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/// repository, mentioned accounts and direct targets, never the actor.
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pub async fn deliver(app: &Shared, ev: Event<'_>) {
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    let pool = &app.db;
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    let mut targets: BTreeSet<i64> = BTreeSet::new();
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    if let Some((kind, id)) = ev.thread {
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        if let Ok(subs) = ndb::subscribers(pool, kind, id).await {
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            targets.extend(subs);
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        }
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        // Acting on a thread subscribes the actor to it.
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        ndb::subscribe(pool, ev.actor.id, kind, id).await.ok();
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    }
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    if let Ok(w) = ndb::watchers(pool, ev.repo_id).await {
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        targets.extend(w);
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    }
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    for name in mentions(ev.mention_text) {
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        if let Ok(Some(a)) = db::accounts::account_by_name(pool, &name).await {
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            targets.insert(a.id);
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        }
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    }
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    targets.extend(ev.direct.iter().copied());
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    targets.remove(&ev.actor.id);
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    for id in targets {
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        ndb::add(pool, id, ev.kind, &ev.title, &ev.url, &ev.actor.username).await.ok();
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        if let Ok(Some(a)) = db::accounts::account_by_id(pool, id).await {
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            if a.email_notifications && !a.email.is_empty() {
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                email(app, &a, &ev.title, &ev.url, &ev.actor.username).await;
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            }
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        }
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    }
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}
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async fn email(app: &Shared, to: &Account, title: &str, url: &str, actor: &str) {
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    let cfg = &app.config.email;
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    if cfg.smtp.is_empty() || cfg.from.is_empty() {
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        return;
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    }
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    use lettre::message::header::ContentType;
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    use lettre::{AsyncSmtpTransport, AsyncTransport, Message, Tokio1Executor};
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    let unsubscribe = format!("{}/settings/notifications?unsubscribe={}", app.config.base_url(), to.unsubscribe_key);
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    let body = format!("{actor}: {title}\n\n{}{url}\n\nStop these emails: {unsubscribe}\n", app.config.base_url());
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    let Ok(message) = Message::builder()
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        .from(cfg.from.parse().unwrap_or_else(|_| "hub@localhost".parse().unwrap()))
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        .to(match format!("{} <{}>", to.name(), to.email).parse() {
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            Ok(m) => m,
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            Err(_) => return,
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        })
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        .subject(format!("[{}] {title}", app.config.site.name))
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        .header(ContentType::TEXT_PLAIN)
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        .body(body)
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    else {
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        return;
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    };
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    let transport = match AsyncSmtpTransport::<Tokio1Executor>::from_url(&cfg.smtp) {
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        Ok(t) => t.build(),
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        Err(e) => {
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            tracing::warn!("smtp url: {e}");
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            return;
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        }
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    };
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    if let Err(e) = transport.send(message).await {
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        tracing::warn!("email to {}: {e}", to.email);
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    }
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}
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#[cfg(test)]
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mod tests {
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    use super::*;
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    #[test]
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    fn finds_mentions() {
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        assert_eq!(mentions("cc @andy and @bob. not an email [email protected], nor /@path"), vec!["andy", "bob"]);
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        assert!(mentions("nothing here").is_empty());
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    }
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}