controllers/krate/delete: Send deletion notification email after succ…

…essful deletion

src/controllers/krate/delete.rs

@@ -1,6 +1,7 @@
 use crate::app::AppState;
 use crate::auth::AuthCheck;
 use crate::controllers::krate::CratePath;
+use crate::email::Email;
 use crate::models::{NewDeletedCrate, Rights};
 use crate::schema::{crate_downloads, crates, dependencies};
 use crate::util::errors::{custom, AppResult, BoxedAppError};
@@ -79,6 +80,7 @@ pub async fn delete_crate(path: CratePath, parts: Parts, app: AppState) -> AppRe
         }
     }
 
+    let crate_name = krate.name.clone();
     conn.transaction(|conn| {
         async move {
             diesel::delete(crates::table.find(krate.id))
@@ -116,6 +118,23 @@ pub async fn delete_crate(path: CratePath, parts: Parts, app: AppState) -> AppRe
     })
     .await?;
 
+    let email_future = async {
+        if let Some(recipient) = user.email(&mut conn).await? {
+            let email = CrateDeletionEmail {
+                user: &user.gh_login,
+                krate: &crate_name,
+            };
+
+            app.emails.send(&recipient, email).await?
+        }
+
+        Ok::<_, anyhow::Error>(())
+    };
+
+    if let Err(err) = email_future.await {
+        error!("Failed to send crate deletion email: {err}");
+    }
+
     Ok(StatusCode::NO_CONTENT)
 }
 
@@ -147,6 +166,33 @@ async fn has_rev_dep(conn: &mut AsyncPgConnection, crate_id: i32) -> QueryResult
     Ok(rev_dep.is_some())
 }
 
+/// Email template for notifying a crate owner about a crate being deleted.
+///
+/// The owner usually should be aware of the deletion since they initiated it,
+/// but this email can be helpful in detecting malicious account activity.
+#[derive(Debug, Clone)]
+struct CrateDeletionEmail<'a> {
+    user: &'a str,
+    krate: &'a str,
+}
+
+impl Email for CrateDeletionEmail<'_> {
+    fn subject(&self) -> String {
+        format!("crates.io: Deleted \"{}\" crate", self.krate)
+    }
+
+    fn body(&self) -> String {
+        format!(
+            "Hi {},
+
+this is a confirmation email for the deletion of your \"{}\" crate.
+
+If you did not initiate this deletion, your account may have been compromised. Please contact us at [email protected].",
+            self.user, self.krate
+        )
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -185,6 +231,8 @@ mod tests {
         assert_eq!(response.status(), StatusCode::NO_CONTENT);
         assert!(response.body().is_empty());
 
+        assert_snapshot!(app.emails_snapshot().await);
+
         // Assert that the crate no longer exists
         assert_crate_exists(&anon, "foo", false).await;
         assert!(!upstream.crate_exists("foo")?);
@@ -220,6 +268,8 @@ mod tests {
         assert_eq!(response.status(), StatusCode::NO_CONTENT);
         assert!(response.body().is_empty());
 
+        assert_snapshot!(app.emails_snapshot().await);
+
         // Assert that the crate no longer exists
         assert_crate_exists(&anon, "foo", false).await;
         assert!(!upstream.crate_exists("foo")?);
@@ -255,6 +305,8 @@ mod tests {
         assert_eq!(response.status(), StatusCode::NO_CONTENT);
         assert!(response.body().is_empty());
 
+        assert_snapshot!(app.emails_snapshot().await);
+
         // Assert that the crate no longer exists
         assert_crate_exists(&anon, "foo", false).await;
         assert!(!upstream.crate_exists("foo")?);

src/controllers/krate/snapshots/crates_io__controllers__krate__delete__tests__happy_path_new_crate-2.snap

@@ -0,0 +1,33 @@
+---
+source: src/controllers/krate/delete.rs
+expression: app.emails_snapshot().await
+snapshot_kind: text
+---
+To: foo@example.com
+From: crates.io <noreply@crates.io>
+Subject: crates.io: Successfully published foo@1.0.0
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: quoted-printable
+
+Hello foo!
+
+A new version of the package foo (1.0.0) was published by your account (htt=
+ps://crates.io/users/foo) at [0000-00-00T00:00:00Z].
+
+If you have questions or security concerns, you can contact us at help@crat=
+es.io. If you would like to stop receiving these security notifications, yo=
+u can disable them in your account settings.
+----------------------------------------
+
+To: foo@example.com
+From: crates.io <noreply@crates.io>
+Subject: crates.io: Deleted "foo" crate
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: quoted-printable
+
+Hi foo,
+
+this is a confirmation email for the deletion of your "foo" crate.
+
+If you did not initiate this deletion, your account may have been compromis=
+ed. Please contact us at help@crates.io.

src/controllers/krate/snapshots/crates_io__controllers__krate__delete__tests__happy_path_old_crate-2.snap

@@ -0,0 +1,33 @@
+---
+source: src/controllers/krate/delete.rs
+expression: app.emails_snapshot().await
+snapshot_kind: text
+---
+To: foo@example.com
+From: crates.io <noreply@crates.io>
+Subject: crates.io: Successfully published foo@1.0.0
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: quoted-printable
+
+Hello foo!
+
+A new version of the package foo (1.0.0) was published by your account (htt=
+ps://crates.io/users/foo) at [0000-00-00T00:00:00Z].
+
+If you have questions or security concerns, you can contact us at help@crat=
+es.io. If you would like to stop receiving these security notifications, yo=
+u can disable them in your account settings.
+----------------------------------------
+
+To: foo@example.com
+From: crates.io <noreply@crates.io>
+Subject: crates.io: Deleted "foo" crate
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: quoted-printable
+
+Hi foo,
+
+this is a confirmation email for the deletion of your "foo" crate.
+
+If you did not initiate this deletion, your account may have been compromis=
+ed. Please contact us at help@crates.io.

src/controllers/krate/snapshots/crates_io__controllers__krate__delete__tests__happy_path_really_old_crate-2.snap

@@ -0,0 +1,33 @@
+---
+source: src/controllers/krate/delete.rs
+expression: app.emails_snapshot().await
+snapshot_kind: text
+---
+To: foo@example.com
+From: crates.io <noreply@crates.io>
+Subject: crates.io: Successfully published foo@1.0.0
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: quoted-printable
+
+Hello foo!
+
+A new version of the package foo (1.0.0) was published by your account (htt=
+ps://crates.io/users/foo) at [0000-00-00T00:00:00Z].
+
+If you have questions or security concerns, you can contact us at help@crat=
+es.io. If you would like to stop receiving these security notifications, yo=
+u can disable them in your account settings.
+----------------------------------------
+
+To: foo@example.com
+From: crates.io <noreply@crates.io>
+Subject: crates.io: Deleted "foo" crate
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: quoted-printable
+
+Hi foo,
+
+this is a confirmation email for the deletion of your "foo" crate.
+
+If you did not initiate this deletion, your account may have been compromis=
+ed. Please contact us at help@crates.io.