From 11c3971d9e68a02e367b17e076dc09485ffef7e4 Mon Sep 17 00:00:00 2001
From: Felix Ableitner <me@nutomic.com>
Date: Fri, 8 Mar 2024 16:49:00 +0100
Subject: [PATCH] Add basic nodeinfo

---
 src/backend/mod.rs      |  2 ++
 src/backend/nodeinfo.rs | 66 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 src/backend/nodeinfo.rs

diff --git a/src/backend/mod.rs b/src/backend/mod.rs
index d19ef5b..862ded0 100644
--- a/src/backend/mod.rs
+++ b/src/backend/mod.rs
@@ -50,6 +50,7 @@ pub mod config;
 pub mod database;
 pub mod error;
 pub mod federation;
+mod nodeinfo;
 mod utils;
 
 const MIGRATIONS: EmbeddedMigrations = embed_migrations!("migrations");
@@ -92,6 +93,7 @@ pub async fn start(config: IbisConfig) -> MyResult<()> {
         .nest("", asset_routes()?)
         .nest(FEDERATION_ROUTES_PREFIX, federation_routes())
         .nest("/api/v1", api_routes())
+        .nest("", nodeinfo::config())
         .layer(FederationMiddleware::new(config))
         .layer(CorsLayer::permissive());
 
diff --git a/src/backend/nodeinfo.rs b/src/backend/nodeinfo.rs
new file mode 100644
index 0000000..5e9c7b0
--- /dev/null
+++ b/src/backend/nodeinfo.rs
@@ -0,0 +1,66 @@
+use crate::{
+    backend::{database::IbisData, error::MyResult},
+    common::utils::http_protocol_str,
+};
+use activitypub_federation::config::Data;
+use axum::{routing::get, Json, Router};
+use serde::{Deserialize, Serialize};
+use url::Url;
+
+pub fn config() -> Router {
+    Router::new()
+        .route("/nodeinfo/2.0.json", get(node_info))
+        .route("/.well-known/nodeinfo", get(node_info_well_known))
+}
+
+async fn node_info_well_known(data: Data<IbisData>) -> MyResult<Json<NodeInfoWellKnown>> {
+    Ok(Json(NodeInfoWellKnown {
+        links: vec![NodeInfoWellKnownLinks {
+            rel: Url::parse("http://nodeinfo.diaspora.software/ns/schema/2.0")?,
+            href: Url::parse(&format!(
+                "{}://{}/nodeinfo/2.0.json",
+                http_protocol_str(),
+                data.domain()
+            ))?,
+        }],
+    }))
+}
+
+async fn node_info(data: Data<IbisData>) -> MyResult<Json<NodeInfo>> {
+    Ok(Json(NodeInfo {
+        version: "2.0".to_string(),
+        software: NodeInfoSoftware {
+            name: "ibis".to_string(),
+            version: env!("CARGO_PKG_VERSION").to_string(),
+        },
+        protocols: vec!["activitypub".to_string()],
+        open_registrations: data.config.registration_open,
+    }))
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+struct NodeInfoWellKnown {
+    pub links: Vec<NodeInfoWellKnownLinks>,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+struct NodeInfoWellKnownLinks {
+    pub rel: Url,
+    pub href: Url,
+}
+
+#[derive(Serialize, Deserialize, Debug, Default)]
+#[serde(rename_all = "camelCase", default)]
+pub struct NodeInfo {
+    pub version: String,
+    pub software: NodeInfoSoftware,
+    pub protocols: Vec<String>,
+    pub open_registrations: bool,
+}
+
+#[derive(Serialize, Deserialize, Debug, Default)]
+#[serde(default)]
+pub struct NodeInfoSoftware {
+    pub name: String,
+    pub version: String,
+}