handlers: add tests for client registration

crates/handlers/src/oauth2/registration.rs

@@ -37,13 +37,13 @@ pub(crate) enum RouteError {
     #[error(transparent)]
     Internal(Box<dyn std::error::Error + Send + Sync>),
 
-    #[error("invalid redirect uri")]
-    InvalidRedirectUri,
+    #[error(transparent)]
+    JsonExtract(#[from] axum::extract::rejection::JsonRejection),
 
     #[error("invalid client metadata")]
-    InvalidClientMetadata,
+    InvalidClientMetadata(#[from] ClientMetadataVerificationError),
 
-    #[error("denied by the policy")]
+    #[error("denied by the policy: {0:?}")]
     PolicyDenied(Vec<Violation>),
 }
 
@@ -53,18 +53,6 @@ impl_from_error_for_route!(mas_policy::InstanciateError);
 impl_from_error_for_route!(mas_policy::EvaluationError);
 impl_from_error_for_route!(mas_keystore::aead::Error);
 
-impl From<ClientMetadataVerificationError> for RouteError {
-    fn from(e: ClientMetadataVerificationError) -> Self {
-        match e {
-            ClientMetadataVerificationError::MissingRedirectUris
-            | ClientMetadataVerificationError::RedirectUriWithFragment(_) => {
-                Self::InvalidRedirectUri
-            }
-            _ => Self::InvalidClientMetadata,
-        }
-    }
-}
-
 impl IntoResponse for RouteError {
     fn into_response(self) -> axum::response::Response {
         sentry::capture_error(&self);
@@ -74,17 +62,59 @@ impl IntoResponse for RouteError {
                 Json(ClientError::from(ClientErrorCode::ServerError)),
             )
                 .into_response(),
-            Self::InvalidRedirectUri => (
+
+            // This error happens if we managed to parse the incomiong JSON but it can't be
+            // deserialized to the expected type. In this case we return an
+            // `invalid_client_metadata` error with the details of the error.
+            Self::JsonExtract(axum::extract::rejection::JsonRejection::JsonDataError(e)) => (
+                StatusCode::BAD_REQUEST,
+                Json(
+                    ClientError::from(ClientErrorCode::InvalidClientMetadata)
+                        .with_description(e.to_string()),
+                ),
+            )
+                .into_response(),
+
+            // For all other JSON errors we return a `invalid_request` error, since this is
+            // probably due to a malformed request.
+            Self::JsonExtract(_) => (
+                StatusCode::BAD_REQUEST,
+                Json(ClientError::from(ClientErrorCode::InvalidRequest)),
+            )
+                .into_response(),
+
+            // This error comes from the `ClientMetadata::validate` method. We return an
+            // `invalid_redirect_uri` error if the error is related to the redirect URIs, else we
+            // return an `invalid_client_metadata` error.
+            Self::InvalidClientMetadata(
+                ClientMetadataVerificationError::MissingRedirectUris
+                | ClientMetadataVerificationError::RedirectUriWithFragment(_),
+            ) => (
                 StatusCode::BAD_REQUEST,
                 Json(ClientError::from(ClientErrorCode::InvalidRedirectUri)),
             )
                 .into_response(),
-            Self::InvalidClientMetadata => (
+
+            Self::InvalidClientMetadata(e) => (
                 StatusCode::BAD_REQUEST,
-                Json(ClientError::from(ClientErrorCode::InvalidClientMetadata)),
+                Json(
+                    ClientError::from(ClientErrorCode::InvalidClientMetadata)
+                        .with_description(e.to_string()),
+                ),
             )
                 .into_response(),
+
+            // For policy violations, we return an `invalid_client_metadata` error with the details
+            // of the violations in most cases. If a violation includes `redirect_uri` in the
+            // message, we return an `invalid_redirect_uri` error instead.
             Self::PolicyDenied(violations) => {
+                // TODO: detect them better
+                let code = if violations.iter().any(|v| v.msg.contains("redirect_uri")) {
+                    ClientErrorCode::InvalidRedirectUri
+                } else {
+                    ClientErrorCode::InvalidClientMetadata
+                };
+
                 let collected = &violations
                     .iter()
                     .map(|v| v.msg.clone())
@@ -92,11 +122,8 @@ impl IntoResponse for RouteError {
                 let joined = collected.join("; ");
 
                 (
-                    StatusCode::UNAUTHORIZED,
-                    Json(
-                        ClientError::from(ClientErrorCode::InvalidClientMetadata)
-                            .with_description(joined),
-                    ),
+                    StatusCode::BAD_REQUEST,
+                    Json(ClientError::from(code).with_description(joined)),
                 )
                     .into_response()
             }
@@ -111,8 +138,11 @@ pub(crate) async fn post(
     mut repo: BoxRepository,
     State(policy_factory): State<Arc<PolicyFactory>>,
     State(encrypter): State<Encrypter>,
-    Json(body): Json<ClientMetadata>,
+    body: Result<Json<ClientMetadata>, axum::extract::rejection::JsonRejection>,
 ) -> Result<impl IntoResponse, RouteError> {
+    // Propagate any JSON extraction error
+    let Json(body) = body?;
+
     info!(?body, "Client registration");
 
     // Validate the body
@@ -179,3 +209,112 @@ pub(crate) async fn post(
 
     Ok((StatusCode::CREATED, Json(response)))
 }
+
+#[cfg(test)]
+mod tests {
+    use hyper::{Request, StatusCode};
+    use mas_router::SimpleRoute;
+    use oauth2_types::{
+        errors::{ClientError, ClientErrorCode},
+        registration::ClientRegistrationResponse,
+    };
+    use sqlx::PgPool;
+
+    use crate::test_utils::{init_tracing, RequestBuilderExt, ResponseExt, TestState};
+
+    #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
+    async fn test_registration_error(pool: PgPool) {
+        init_tracing();
+        let state = TestState::from_pool(pool).await.unwrap();
+
+        // Body is not a JSON
+        let request = Request::post(mas_router::OAuth2RegistrationEndpoint::PATH)
+            .body("this is not a json".to_owned())
+            .unwrap();
+
+        let response = state.request(request).await;
+        response.assert_status(StatusCode::BAD_REQUEST);
+        let response: ClientError = serde_json::from_str(response.body()).unwrap();
+        assert_eq!(response.error, ClientErrorCode::InvalidRequest);
+
+        // Invalid client metadata
+        let request =
+            Request::post(mas_router::OAuth2RegistrationEndpoint::PATH).json(serde_json::json!({
+                "client_uri": "this is not a uri",
+            }));
+
+        let response = state.request(request).await;
+        response.assert_status(StatusCode::BAD_REQUEST);
+        let response: ClientError = serde_json::from_str(response.body()).unwrap();
+        assert_eq!(response.error, ClientErrorCode::InvalidClientMetadata);
+
+        // Invalid redirect URI
+        let request =
+            Request::post(mas_router::OAuth2RegistrationEndpoint::PATH).json(serde_json::json!({
+                "application_type": "web",
+                "contacts": ["hello@example.com"],
+                "client_uri": "https://example.com/",
+                "redirect_uris": ["http://this-is-insecure.com/"],
+            }));
+
+        let response = state.request(request).await;
+        response.assert_status(StatusCode::BAD_REQUEST);
+        let response: ClientError = serde_json::from_str(response.body()).unwrap();
+        assert_eq!(response.error, ClientErrorCode::InvalidRedirectUri);
+
+        // Incoherent response types
+        let request =
+            Request::post(mas_router::OAuth2RegistrationEndpoint::PATH).json(serde_json::json!({
+                "contacts": ["hello@example.com"],
+                "client_uri": "https://example.com/",
+                "redirect_uris": ["https://example.com/"],
+                "response_types": ["id_token"],
+                "grant_types": ["authorization_code"],
+            }));
+
+        let response = state.request(request).await;
+        response.assert_status(StatusCode::BAD_REQUEST);
+        let response: ClientError = serde_json::from_str(response.body()).unwrap();
+        assert_eq!(response.error, ClientErrorCode::InvalidClientMetadata);
+    }
+
+    #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
+    async fn test_registration(pool: PgPool) {
+        init_tracing();
+        let state = TestState::from_pool(pool).await.unwrap();
+
+        // A successful registration with no authentication should not return a client
+        // secret
+        let request =
+            Request::post(mas_router::OAuth2RegistrationEndpoint::PATH).json(serde_json::json!({
+                "contacts": ["hello@example.com"],
+                "client_uri": "https://example.com/",
+                "redirect_uris": ["https://example.com/"],
+                "response_types": ["code"],
+                "grant_types": ["authorization_code"],
+                "token_endpoint_auth_method": "none",
+            }));
+
+        let response = state.request(request).await;
+        response.assert_status(StatusCode::CREATED);
+        let response: ClientRegistrationResponse = serde_json::from_str(response.body()).unwrap();
+        assert!(response.client_secret.is_none());
+
+        // A successful registration with client_secret based authentication should
+        // return a client secret
+        let request =
+            Request::post(mas_router::OAuth2RegistrationEndpoint::PATH).json(serde_json::json!({
+                "contacts": ["hello@example.com"],
+                "client_uri": "https://example.com/",
+                "redirect_uris": ["https://example.com/"],
+                "response_types": ["code"],
+                "grant_types": ["authorization_code"],
+                "token_endpoint_auth_method": "client_secret_basic",
+            }));
+
+        let response = state.request(request).await;
+        response.assert_status(StatusCode::CREATED);
+        let response: ClientRegistrationResponse = serde_json::from_str(response.body()).unwrap();
+        assert!(response.client_secret.is_some());
+    }
+}

crates/handlers/src/oauth2/revoke.rs

@@ -213,15 +213,11 @@ mod tests {
     use sqlx::PgPool;
 
     use super::*;
-    use crate::test_utils::{RequestBuilderExt, ResponseExt, TestState};
+    use crate::test_utils::{init_tracing, RequestBuilderExt, ResponseExt, TestState};
 
     #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
     async fn test_revoke_access_token(pool: PgPool) {
-        tracing_subscriber::fmt()
-            .with_max_level(tracing::Level::INFO)
-            .with_test_writer()
-            .init();
-
+        init_tracing();
         let state = TestState::from_pool(pool).await.unwrap();
 
         let request =

crates/handlers/src/test_utils.rs

@@ -43,6 +43,13 @@ use crate::{
     MatrixHomeserver,
 };
 
+pub(crate) fn init_tracing() {
+    let _ = tracing_subscriber::fmt()
+        .with_max_level(tracing::Level::INFO)
+        .with_test_writer()
+        .try_init();
+}
+
 #[derive(Clone)]
 pub(crate) struct TestState {
     pub pool: PgPool,