119 lines
3.3 KiB
Rust
119 lines
3.3 KiB
Rust
use activitypub_federation::{
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config::Data,
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fetch::webfinger::{extract_webfinger_name, Webfinger, WebfingerLink},
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};
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use actix_web::{web, web::Query, HttpResponse};
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use lemmy_api_common::context::LemmyContext;
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use lemmy_db_schema::{
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source::{community::Community, person::Person},
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traits::ApubActor,
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CommunityVisibility,
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};
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use lemmy_utils::{cache_header::cache_3days, error::LemmyError};
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use serde::Deserialize;
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use std::collections::HashMap;
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use url::Url;
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#[derive(Deserialize)]
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struct Params {
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resource: String,
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}
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pub fn config(cfg: &mut web::ServiceConfig) {
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cfg.route(
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".well-known/webfinger",
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web::get().to(get_webfinger_response).wrap(cache_3days()),
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);
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}
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/// Responds to webfinger requests of the following format. There isn't any real documentation for
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/// this, but it described in this blog post:
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/// https://mastodon.social/.well-known/webfinger?resource=acct:gargron@mastodon.social
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///
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/// You can also view the webfinger response that Mastodon sends:
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/// https://radical.town/.well-known/webfinger?resource=acct:felix@radical.town
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async fn get_webfinger_response(
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info: Query<Params>,
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context: Data<LemmyContext>,
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) -> Result<HttpResponse, LemmyError> {
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let name = extract_webfinger_name(&info.resource, &context)?;
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let user_id: Option<Url> = Person::read_from_name(&mut context.pool(), name, false)
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.await
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.ok()
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.map(|c| c.actor_id.into());
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let community_id: Option<Url> = Community::read_from_name(&mut context.pool(), name, false)
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.await
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.ok()
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.and_then(|c| {
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if c.visibility == CommunityVisibility::Public {
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let id: Url = c.actor_id.into();
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Some(id)
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} else {
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None
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}
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});
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// Mastodon seems to prioritize the last webfinger item in case of duplicates. Put
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// community last so that it gets prioritized. For Lemmy the order doesnt matter.
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let links = vec![
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webfinger_link_for_actor(user_id, "Person", &context),
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webfinger_link_for_actor(community_id, "Group", &context),
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]
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.into_iter()
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.flatten()
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.collect();
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let json = Webfinger {
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subject: info.resource.clone(),
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links,
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..Default::default()
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};
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Ok(HttpResponse::Ok().json(json))
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}
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fn webfinger_link_for_actor(
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url: Option<Url>,
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kind: &str,
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context: &LemmyContext,
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) -> Vec<WebfingerLink> {
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if let Some(url) = url {
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let type_key = "https://www.w3.org/ns/activitystreams#type"
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.parse()
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.expect("parse url");
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let mut vec = vec![
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WebfingerLink {
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rel: Some("http://webfinger.net/rel/profile-page".into()),
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kind: Some("text/html".into()),
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href: Some(url.clone()),
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..Default::default()
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},
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WebfingerLink {
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rel: Some("self".into()),
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kind: Some("application/activity+json".into()),
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href: Some(url),
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properties: HashMap::from([(type_key, kind.into())]),
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..Default::default()
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},
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];
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// insert remote follow link
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if kind == "Person" {
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let template = format!(
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"{}/activitypub/externalInteraction?uri={{uri}}",
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context.settings().get_protocol_and_hostname()
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);
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vec.push(WebfingerLink {
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rel: Some("http://ostatus.org/schema/1.0/subscribe".into()),
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template: Some(template),
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..Default::default()
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});
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}
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vec
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} else {
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vec![]
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}
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}
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