From 812f1cafe3f8a68bf45b677fade7417c30d92eac Mon Sep 17 00:00:00 2001
From: Owen Jacobson <owen@grimoire.ca>
Date: Fri, 11 Oct 2024 22:40:03 -0400
Subject: Create APIs for inviting users.

---
 src/invite/app.rs | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 src/invite/app.rs

(limited to 'src/invite/app.rs')

diff --git a/src/invite/app.rs b/src/invite/app.rs
new file mode 100644
index 0000000..998b4f1
--- /dev/null
+++ b/src/invite/app.rs
@@ -0,0 +1,106 @@
+use chrono::TimeDelta;
+use sqlx::sqlite::SqlitePool;
+
+use super::{repo::Provider as _, Id, Invite, Summary};
+use crate::{
+    clock::DateTime,
+    db::NotFound as _,
+    event::repo::Provider as _,
+    login::{repo::Provider as _, Login, Password},
+    token::{repo::Provider as _, Secret},
+};
+
+pub struct Invites<'a> {
+    db: &'a SqlitePool,
+}
+
+impl<'a> Invites<'a> {
+    pub const fn new(db: &'a SqlitePool) -> Self {
+        Self { db }
+    }
+
+    pub async fn create(
+        &self,
+        issuer: &Login,
+        issued_at: &DateTime,
+    ) -> Result<Invite, sqlx::Error> {
+        let mut tx = self.db.begin().await?;
+        let invite = tx.invites().create(issuer, issued_at).await?;
+        tx.commit().await?;
+
+        Ok(invite)
+    }
+
+    pub async fn get(&self, invite: &Id) -> Result<Summary, Error> {
+        let mut tx = self.db.begin().await?;
+        let invite = tx
+            .invites()
+            .summary(invite)
+            .await
+            .not_found(|| Error::NotFound(invite.clone()))?;
+        tx.commit().await?;
+
+        Ok(invite)
+    }
+
+    pub async fn accept(
+        &self,
+        invite: &Id,
+        name: &str,
+        password: &Password,
+        accepted_at: &DateTime,
+    ) -> Result<Secret, AcceptError> {
+        let mut tx = self.db.begin().await?;
+        let invite = tx
+            .invites()
+            .by_id(invite)
+            .await
+            .not_found(|| AcceptError::NotFound(invite.clone()))?;
+        // Split the tx here so we don't block writes while we deal with the password,
+        // and don't deal with the password until we're fairly confident we can accept
+        // the invite. Final validation is in the next tx.
+        tx.commit().await?;
+
+        let password_hash = password.hash()?;
+
+        let mut tx = self.db.begin().await?;
+        // If the invite has been deleted or accepted in the interim, this step will
+        // catch it.
+        tx.invites().accept(&invite).await?;
+        let created = tx.sequence().next(accepted_at).await?;
+        let login = tx.logins().create(name, &password_hash, &created).await?;
+        let secret = tx.tokens().issue(&login, accepted_at).await?;
+        tx.commit().await?;
+
+        Ok(secret)
+    }
+
+    pub async fn expire(&self, relative_to: &DateTime) -> Result<(), sqlx::Error> {
+        // Somewhat arbitrarily, expire after one day.
+        let expire_at = relative_to.to_owned() - TimeDelta::days(1);
+
+        let mut tx = self.db.begin().await?;
+        tx.invites().expire(&expire_at).await?;
+        tx.commit().await?;
+
+        Ok(())
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("invite not found: {0}")]
+    NotFound(Id),
+    #[error(transparent)]
+    Database(#[from] sqlx::Error),
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum AcceptError {
+    #[error("invite not found: {0}")]
+    NotFound(Id),
+    #[error(transparent)]
+    Database(#[from] sqlx::Error),
+    #[error(transparent)]
+    PasswordHash(#[from] password_hash::Error),
+}
-- 
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