From 7abb5af40a99d451cae3c3578b964983e8bc68a6 Mon Sep 17 00:00:00 2001
From: John Lewis <github@jlewis.sh>
Date: Wed, 31 Jan 2024 14:35:18 -0600
Subject: [PATCH] scaffolded auth backend type

---
 engine/Cargo.lock                    |  4 +++
 engine/Cargo.toml                    |  1 +
 engine/crates/auth/Cargo.toml        |  5 ++++
 engine/crates/auth/src/lib.rs        | 45 +++++++++++++++++++++++++++-
 engine/crates/clients/src/surreal.rs |  1 +
 5 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/engine/Cargo.lock b/engine/Cargo.lock
index 8bf5b0b..f87084c 100644
--- a/engine/Cargo.lock
+++ b/engine/Cargo.lock
@@ -215,9 +215,13 @@ dependencies = [
 name = "auth"
 version = "0.1.0"
 dependencies = [
+ "async-trait",
  "axum-login",
+ "clients",
+ "color-eyre",
  "serde",
  "surrealdb",
+ "thiserror",
 ]
 
 [[package]]
diff --git a/engine/Cargo.toml b/engine/Cargo.toml
index e41ddea..0c9f2c5 100644
--- a/engine/Cargo.toml
+++ b/engine/Cargo.toml
@@ -7,6 +7,7 @@ members = ["crates/*"]
 tokio = { version = "1.35.1", features = ["full"] }
 color-eyre = "0.6.2"
 axum = "0.7.4"
+thiserror = "1.0.56"
 tracing = "0.1.40"
 tracing-subscriber = "0.3.18"
 serde = { version = "1.0.196", features = ["derive"] }
diff --git a/engine/crates/auth/Cargo.toml b/engine/crates/auth/Cargo.toml
index b36b8c7..1281bd2 100644
--- a/engine/crates/auth/Cargo.toml
+++ b/engine/crates/auth/Cargo.toml
@@ -8,4 +8,9 @@ edition = "2021"
 [dependencies]
 axum-login = "0.13.1"
 serde.workspace = true
+color-eyre.workspace = true
+thiserror.workspace = true
 surrealdb.workspace = true
+
+clients = { path = "../clients" }
+async-trait = "0.1.77"
diff --git a/engine/crates/auth/src/lib.rs b/engine/crates/auth/src/lib.rs
index e862042..214f233 100644
--- a/engine/crates/auth/src/lib.rs
+++ b/engine/crates/auth/src/lib.rs
@@ -1,4 +1,4 @@
-use axum_login::AuthUser;
+use axum_login::{AuthUser, AuthnBackend, UserId};
 use serde::{Deserialize, Serialize};
 use surrealdb::sql::Thing;
 
@@ -25,3 +25,46 @@ impl AuthUser for AuthenticatedUser {
   fn id(&self) -> Self::Id { self.id.clone() }
   fn session_auth_hash(&self) -> &[u8] { self.password.as_bytes() }
 }
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct Credentials {
+  pub username: String,
+  pub password: String,
+  pub next:     Option<String>,
+}
+
+#[derive(Clone)]
+pub struct Backend {
+  surreal_client: clients::surreal::SurrealRootClient,
+}
+
+impl Backend {
+  pub async fn new() -> color_eyre::Result<Self> {
+    Ok(Self {
+      surreal_client: clients::surreal::SurrealRootClient::new().await?,
+    })
+  }
+}
+
+#[async_trait::async_trait]
+impl AuthnBackend for Backend {
+  type User = AuthenticatedUser;
+  type Credentials = Credentials;
+  type Error = std::convert::Infallible;
+
+  async fn authenticate(
+    &self,
+    credentials: Self::Credentials,
+  ) -> Result<Option<Self::User>, Self::Error> {
+    let surreal_client = &self.surreal_client;
+
+    Ok(None)
+  }
+
+  async fn get_user(
+    &self,
+    user_id: &UserId<Self>,
+  ) -> Result<Option<Self::User>, Self::Error> {
+    Ok(None)
+  }
+}
diff --git a/engine/crates/clients/src/surreal.rs b/engine/crates/clients/src/surreal.rs
index 765a3c0..a79e37d 100644
--- a/engine/crates/clients/src/surreal.rs
+++ b/engine/crates/clients/src/surreal.rs
@@ -10,6 +10,7 @@ use surrealdb::{
 };
 
 /// A root-level client for the SurrealDB database.
+#[derive(Clone, Debug)]
 pub struct SurrealRootClient {
   client: surrealdb::Surreal<Client>,
 }