use actix_web::{web, web::Query, HttpResponse}; use anyhow::Context; use lemmy_api_common::utils::blocking; use lemmy_apub::fetcher::webfinger::{WebfingerLink, WebfingerResponse}; use lemmy_db_schema::{ source::{community::Community, person::Person}, traits::ApubActor, }; use lemmy_utils::{error::LemmyError, location_info, settings::structs::Settings}; use lemmy_websocket::LemmyContext; use serde::Deserialize; use url::Url; #[derive(Deserialize)] struct Params { resource: String, } pub fn config(cfg: &mut web::ServiceConfig, settings: &Settings) { if settings.federation.enabled { cfg.route( ".well-known/webfinger", web::get().to(get_webfinger_response), ); } } /// Responds to webfinger requests of the following format. There isn't any real documentation for /// this, but it described in this blog post: /// https://mastodon.social/.well-known/webfinger?resource=acct:gargron@mastodon.social /// /// You can also view the webfinger response that Mastodon sends: /// https://radical.town/.well-known/webfinger?resource=acct:felix@radical.town async fn get_webfinger_response( info: Query, context: web::Data, ) -> Result { let name = context .settings() .webfinger_regex() .captures(&info.resource) .and_then(|c| c.get(1)) .context(location_info!())? .as_str() .to_string(); let name_ = name.clone(); let user_id: Option = blocking(context.pool(), move |conn| { Person::read_from_name(conn, &name_) }) .await? .ok() .map(|c| c.actor_id.into()); let community_id: Option = blocking(context.pool(), move |conn| { Community::read_from_name(conn, &name) }) .await? .ok() .map(|c| c.actor_id.into()); // Mastodon seems to prioritize the last webfinger item in case of duplicates. Put // community last so that it gets prioritized. For Lemmy the order doesnt matter. let links = vec![ webfinger_link_for_actor(user_id), webfinger_link_for_actor(community_id), ] .into_iter() .flatten() .collect(); let json = WebfingerResponse { subject: info.resource.to_owned(), links, }; Ok(HttpResponse::Ok().json(json)) } fn webfinger_link_for_actor(url: Option) -> Vec { if let Some(url) = url { vec![ WebfingerLink { rel: Some("http://webfinger.net/rel/profile-page".to_string()), kind: Some("text/html".to_string()), href: Some(url.to_owned()), }, WebfingerLink { rel: Some("self".to_string()), kind: Some("application/activity+json".to_string()), href: Some(url), }, ] } else { vec![] } }