lemmy/src/routes/webfinger.rs

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use actix_web::{error::ErrorBadRequest, web::Query, *};
use anyhow::anyhow;
use lemmy_db::{community::Community, user::User_};
use lemmy_structs::{blocking, WebFingerLink, WebFingerResponse};
use lemmy_utils::{
settings::Settings,
LemmyError,
WEBFINGER_COMMUNITY_REGEX,
WEBFINGER_USER_REGEX,
};
use lemmy_websocket::LemmyContext;
use serde::Deserialize;
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#[derive(Deserialize)]
pub struct Params {
resource: String,
}
pub fn config(cfg: &mut web::ServiceConfig) {
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if Settings::get().federation.enabled {
cfg.route(
".well-known/webfinger",
web::get().to(get_webfinger_response),
);
}
}
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/// 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<Params>,
context: web::Data<LemmyContext>,
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) -> Result<HttpResponse, Error> {
let community_regex_parsed = WEBFINGER_COMMUNITY_REGEX
.captures(&info.resource)
.map(|c| c.get(1))
.flatten();
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let user_regex_parsed = WEBFINGER_USER_REGEX
.captures(&info.resource)
.map(|c| c.get(1))
.flatten();
let url = if let Some(community_name) = community_regex_parsed {
let community_name = community_name.as_str().to_owned();
// Make sure the requested community exists.
blocking(context.pool(), move |conn| {
Community::read_from_name(conn, &community_name)
})
.await?
.map_err(|_| ErrorBadRequest(LemmyError::from(anyhow!("not_found"))))?
.actor_id
} else if let Some(user_name) = user_regex_parsed {
let user_name = user_name.as_str().to_owned();
// Make sure the requested user exists.
blocking(context.pool(), move |conn| {
User_::read_from_name(conn, &user_name)
})
.await?
.map_err(|_| ErrorBadRequest(LemmyError::from(anyhow!("not_found"))))?
.actor_id
} else {
return Err(ErrorBadRequest(LemmyError::from(anyhow!("not_found"))));
};
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let json = WebFingerResponse {
subject: info.resource.to_owned(),
aliases: vec![url.to_owned()],
links: vec![
WebFingerLink {
rel: Some("http://webfinger.net/rel/profile-page".to_string()),
type_: Some("text/html".to_string()),
href: Some(url.to_owned()),
template: None,
},
WebFingerLink {
rel: Some("self".to_string()),
type_: Some("application/activity+json".to_string()),
href: Some(url),
template: None,
}, // TODO: this also needs to return the subscribe link once that's implemented
//{
// "rel": "http://ostatus.org/schema/1.0/subscribe",
// "template": "https://my_instance.com/authorize_interaction?uri={uri}"
//}
],
};
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Ok(HttpResponse::Ok().json(json))
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}