lemmy/crates/routes/src/webfinger.rs

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use activitypub_federation::{
config::Data,
fetch::webfinger::{extract_webfinger_name, Webfinger, WebfingerLink, WEBFINGER_CONTENT_TYPE},
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};
use actix_web::{web, web::Query, HttpResponse};
use lemmy_api_common::context::LemmyContext;
use lemmy_db_schema::{
source::{community::Community, person::Person},
traits::ApubActor,
CommunityVisibility,
};
use lemmy_utils::{cache_header::cache_3days, error::LemmyResult};
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).wrap(cache_3days()),
);
}
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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>,
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context: Data<LemmyContext>,
) -> LemmyResult<HttpResponse> {
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let name = extract_webfinger_name(&info.resource, &context)?;
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let links = if name == context.settings().hostname {
// webfinger response for instance actor (required for mastodon authorized fetch)
let url = Url::parse(&context.settings().get_protocol_and_hostname())?;
vec![webfinger_link_for_actor(Some(url), "none", &context)]
} else {
// webfinger response for user/community
let user_id: Option<Url> = Person::read_from_name(&mut context.pool(), name, false)
.await
.ok()
.flatten()
.map(|c| c.actor_id.into());
let community_id: Option<Url> = Community::read_from_name(&mut context.pool(), name, false)
.await
.ok()
.flatten()
.and_then(|c| {
if c.visibility == CommunityVisibility::Public {
let id: Url = c.actor_id.into();
Some(id)
} else {
None
}
});
// 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.
vec![
webfinger_link_for_actor(user_id, "Person", &context),
webfinger_link_for_actor(community_id, "Group", &context),
]
}
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.into_iter()
.flatten()
.collect::<Vec<_>>();
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if links.is_empty() {
Ok(HttpResponse::NotFound().finish())
} else {
let json = Webfinger {
subject: info.resource.clone(),
links,
..Default::default()
};
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Ok(
HttpResponse::Ok()
.content_type(&WEBFINGER_CONTENT_TYPE)
.json(json),
)
}
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}
fn webfinger_link_for_actor(
url: Option<Url>,
kind: &str,
context: &LemmyContext,
) -> Vec<WebfingerLink> {
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if let Some(url) = url {
let type_key = "https://www.w3.org/ns/activitystreams#type"
.parse()
.expect("parse url");
let mut vec = vec![
WebfingerLink {
rel: Some("http://webfinger.net/rel/profile-page".into()),
kind: Some("text/html".into()),
href: Some(url.clone()),
..Default::default()
},
WebfingerLink {
rel: Some("self".into()),
kind: Some("application/activity+json".into()),
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href: Some(url),
properties: HashMap::from([(type_key, kind.into())]),
..Default::default()
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},
];
// insert remote follow link
if kind == "Person" {
let template = format!(
"{}/activitypub/externalInteraction?uri={{uri}}",
context.settings().get_protocol_and_hostname()
);
vec.push(WebfingerLink {
rel: Some("http://ostatus.org/schema/1.0/subscribe".into()),
template: Some(template),
..Default::default()
});
}
vec
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} else {
vec![]
}
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}