impl MSC2964: OIDC token flow

# Conflicts:
#	Cargo.lock

src/service/oidc/mod.rs

@@ -0,0 +1,87 @@
+/// OIDC service.
+///
+/// Provides the registrar, authorizer and issuer needed by [api::client::oidc].
+/// The whole OAuth2 flow is taken care of by [oxide-auth].
+///
+/// TODO At the moment this service provides no method to dynamically add a
+/// client. That would need a dedicated space in the database.
+///
+/// [oxide-auth]: https://docs.rs/oxide-auth
+
+use conduwuit::Result;
+use oxide_auth::{
+	frontends::simple::endpoint::{Generic, Vacant},
+	primitives::{
+		prelude::{
+			AuthMap,
+			Authorizer,
+			Client,
+			ClientMap,
+			Issuer,
+			RandomGenerator,
+			Registrar,
+			TokenMap,
+		},
+		registrar::RegisteredUrl,
+	},
+};
+
+use async_trait::async_trait;
+use std::sync::{Arc, Mutex};
+
+pub struct Service {
+	registrar: Mutex<ClientMap>,
+	authorizer: Mutex<AuthMap<RandomGenerator>>,
+	issuer: Mutex<TokenMap<RandomGenerator>>,
+}
+
+#[async_trait]
+impl crate::Service for Service {
+	fn build(_args: crate::Args<'_>) -> Result<Arc<Self>> {
+		Ok(Arc::new(Self::preconfigured()))
+	}
+
+	fn name(&self) -> &str { crate::service::make_name(std::module_path!()) }
+}
+
+impl Service {
+	pub fn preconfigured() -> Self {
+		Service {
+			registrar: Mutex::new(
+				vec![Client::public(
+					"LocalClient",
+					RegisteredUrl::Semantic(
+						"http://localhost/clientside/endpoint".parse().unwrap(),
+					),
+					"default-scope".parse().unwrap(),
+				)]
+				.into_iter()
+				.collect(),
+			),
+			// Authorization tokens are 16 byte random keys to a memory hash map.
+			authorizer: Mutex::new(AuthMap::new(RandomGenerator::new(16))),
+			// Bearer tokens are also random generated but 256-bit tokens, since they live longer
+			// and this example is somewhat paranoid.
+			//
+			// We could also use a `TokenSigner::ephemeral` here to create signed tokens which can
+			// be read and parsed by anyone, but not maliciously created. However, they can not be
+			// revoked and thus don't offer even longer lived refresh tokens.
+			issuer: Mutex::new(TokenMap::new(RandomGenerator::new(16))),
+		}
+	}
+
+	/// The oxide-auth carry-all endpoint.
+	pub fn endpoint(&self) -> Generic<impl Registrar + '_, impl Authorizer + '_, impl Issuer + '_> {
+		Generic {
+			registrar: self.registrar.lock().unwrap(),
+			authorizer: self.authorizer.lock().unwrap(),
+			issuer: self.issuer.lock().unwrap(),
+			// Solicitor configured later.
+			solicitor: Vacant,
+			// Scope configured later.
+			scopes: Vacant,
+			// `rocket::Response` is `Default`, so we don't need more configuration.
+			response: Vacant,
+		}
+	}
+}