lemmy/crates/routes/src/webfinger.rs

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use actix_web::{web, web::Query, HttpResponse};
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use anyhow::Context;
use lemmy_api_common::context::LemmyContext;
use lemmy_db_schema::{
source::{community::Community, person::Person},
traits::ApubActor,
};
use lemmy_utils::{error::LemmyError, location_info, WebfingerLink, WebfingerResponse};
use serde::Deserialize;
use std::collections::HashMap;
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use url::Url;
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#[derive(Deserialize)]
struct Params {
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resource: String,
}
pub fn config(cfg: &mut web::ServiceConfig) {
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>,
) -> Result<HttpResponse, LemmyError> {
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let name = context
.settings()
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.webfinger_regex()
.captures(&info.resource)
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.and_then(|c| c.get(1))
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.context(location_info!())?
.as_str()
.to_string();
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let name_ = name.clone();
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let user_id: Option<Url> = Person::read_from_name(context.pool(), &name_, false)
.await
.ok()
.map(|c| c.actor_id.into());
let community_id: Option<Url> = Community::read_from_name(context.pool(), &name, false)
.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.
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let links = vec![
webfinger_link_for_actor(user_id, "Person"),
webfinger_link_for_actor(community_id, "Group"),
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]
.into_iter()
.flatten()
.collect();
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let json = WebfingerResponse {
subject: info.resource.clone(),
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links,
};
Ok(HttpResponse::Ok().json(json))
}
fn webfinger_link_for_actor(url: Option<Url>, kind: &str) -> Vec<WebfingerLink> {
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if let Some(url) = url {
let mut properties = HashMap::new();
properties.insert(
"https://www.w3.org/ns/activitystreams#type".to_string(),
kind.to_string(),
);
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vec![
WebfingerLink {
rel: Some("http://webfinger.net/rel/profile-page".to_string()),
kind: Some("text/html".to_string()),
href: Some(url.clone()),
properties: Default::default(),
},
WebfingerLink {
rel: Some("self".to_string()),
kind: Some("application/activity+json".to_string()),
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href: Some(url),
properties,
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},
]
} else {
vec![]
}
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}