lemmy/crates/apub/src/objects/community.rs

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use crate::{
check_apub_id_valid_with_strictness,
collections::{community_moderators::ApubCommunityModerators, CommunityContext},
generate_moderators_url,
generate_outbox_url,
local_instance,
objects::instance::fetch_instance_actor_for_object,
protocol::{
objects::{group::Group, Endpoints},
ImageObject,
Source,
},
ActorType,
};
use activitypub_federation::{
core::object_id::ObjectId,
traits::{Actor, ApubObject},
};
use activitystreams_kinds::actor::GroupType;
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use chrono::NaiveDateTime;
use itertools::Itertools;
use lemmy_api_common::utils::blocking;
use lemmy_db_schema::{source::community::Community, traits::ApubActor};
use lemmy_db_views_actor::structs::CommunityFollowerView;
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use lemmy_utils::{
error::LemmyError,
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utils::{convert_datetime, markdown_to_html},
};
use lemmy_websocket::LemmyContext;
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use std::ops::Deref;
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use tracing::debug;
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use url::Url;
#[derive(Clone, Debug)]
pub struct ApubCommunity(Community);
impl Deref for ApubCommunity {
type Target = Community;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl From<Community> for ApubCommunity {
fn from(c: Community) -> Self {
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ApubCommunity(c)
}
}
#[async_trait::async_trait(?Send)]
impl ApubObject for ApubCommunity {
type DataType = LemmyContext;
type ApubType = Group;
type DbType = Community;
type Error = LemmyError;
fn last_refreshed_at(&self) -> Option<NaiveDateTime> {
Some(self.last_refreshed_at)
}
#[tracing::instrument(skip_all)]
async fn read_from_apub_id(
object_id: Url,
context: &LemmyContext,
) -> Result<Option<Self>, LemmyError> {
Ok(
blocking(context.pool(), move |conn| {
Community::read_from_apub_id(conn, &object_id.into())
})
.await??
.map(Into::into),
)
}
#[tracing::instrument(skip_all)]
async fn delete(self, context: &LemmyContext) -> Result<(), LemmyError> {
blocking(context.pool(), move |conn| {
Community::update_deleted(conn, self.id, true)
})
.await??;
Ok(())
}
#[tracing::instrument(skip_all)]
async fn into_apub(self, _context: &LemmyContext) -> Result<Group, LemmyError> {
let group = Group {
kind: GroupType::Group,
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id: ObjectId::new(self.actor_id()),
preferred_username: self.name.clone(),
name: Some(self.title.clone()),
summary: self.description.as_ref().map(|b| markdown_to_html(b)),
source: self.description.clone().map(Source::new),
icon: self.icon.clone().map(ImageObject::new),
image: self.banner.clone().map(ImageObject::new),
sensitive: Some(self.nsfw),
moderators: Some(ObjectId::<ApubCommunityModerators>::new(
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generate_moderators_url(&self.actor_id)?,
)),
inbox: self.inbox_url.clone().into(),
outbox: ObjectId::new(generate_outbox_url(&self.actor_id)?),
followers: self.followers_url.clone().into(),
endpoints: self.shared_inbox_url.clone().map(|s| Endpoints {
shared_inbox: s.into(),
}),
public_key: self.get_public_key(),
published: Some(convert_datetime(self.published)),
updated: self.updated.map(convert_datetime),
posting_restricted_to_mods: Some(self.posting_restricted_to_mods),
};
Ok(group)
}
#[tracing::instrument(skip_all)]
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async fn verify(
group: &Group,
expected_domain: &Url,
context: &LemmyContext,
_request_counter: &mut i32,
) -> Result<(), LemmyError> {
group.verify(expected_domain, context).await
}
/// Converts a `Group` to `Community`, inserts it into the database and updates moderators.
#[tracing::instrument(skip_all)]
async fn from_apub(
group: Group,
context: &LemmyContext,
request_counter: &mut i32,
) -> Result<ApubCommunity, LemmyError> {
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let form = Group::into_form(group.clone());
// Fetching mods and outbox is not necessary for Lemmy to work, so ignore errors. Besides,
// we need to ignore these errors so that tests can work entirely offline.
let community: ApubCommunity =
blocking(context.pool(), move |conn| Community::upsert(conn, &form))
.await??
.into();
let outbox_data = CommunityContext(community.clone(), context.clone());
group
.outbox
.dereference(&outbox_data, local_instance(context), request_counter)
.await
.map_err(|e| debug!("{}", e))
.ok();
if let Some(moderators) = &group.moderators {
moderators
.dereference(&outbox_data, local_instance(context), request_counter)
.await
.map_err(|e| debug!("{}", e))
.ok();
}
fetch_instance_actor_for_object(community.actor_id(), context, request_counter).await;
Ok(community)
}
}
impl Actor for ApubCommunity {
fn public_key(&self) -> &str {
&self.public_key
}
fn inbox(&self) -> Url {
self.inbox_url.clone().into()
}
fn shared_inbox(&self) -> Option<Url> {
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self.shared_inbox_url.clone().map(|s| s.into())
}
}
impl ActorType for ApubCommunity {
fn actor_id(&self) -> Url {
self.actor_id.to_owned().into()
}
fn private_key(&self) -> Option<String> {
self.private_key.to_owned()
}
}
impl ApubCommunity {
/// For a given community, returns the inboxes of all followers.
#[tracing::instrument(skip_all)]
pub(crate) async fn get_follower_inboxes(
&self,
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context: &LemmyContext,
) -> Result<Vec<Url>, LemmyError> {
let id = self.id;
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let follows = blocking(context.pool(), move |conn| {
CommunityFollowerView::for_community(conn, id)
})
.await??;
let inboxes: Vec<Url> = follows
.into_iter()
.filter(|f| !f.follower.local)
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.map(|f| {
f.follower
.shared_inbox_url
.unwrap_or(f.follower.inbox_url)
.into()
})
.unique()
.filter(|inbox: &Url| inbox.host_str() != Some(&context.settings().hostname))
// Don't send to blocked instances
.filter(|inbox| {
check_apub_id_valid_with_strictness(inbox, false, &context.settings()).is_ok()
})
.collect();
Ok(inboxes)
}
}
#[cfg(test)]
pub(crate) mod tests {
use super::*;
use crate::{
objects::{instance::tests::parse_lemmy_instance, tests::init_context},
protocol::tests::file_to_json_object,
};
use lemmy_db_schema::{source::site::Site, traits::Crud};
use serial_test::serial;
pub(crate) async fn parse_lemmy_community(context: &LemmyContext) -> ApubCommunity {
let mut json: Group = file_to_json_object("assets/lemmy/objects/group.json").unwrap();
// change these links so they dont fetch over the network
json.moderators = None;
json.outbox =
ObjectId::new(Url::parse("https://enterprise.lemmy.ml/c/tenforward/not_outbox").unwrap());
let url = Url::parse("https://enterprise.lemmy.ml/c/tenforward").unwrap();
let mut request_counter = 0;
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ApubCommunity::verify(&json, &url, context, &mut request_counter)
.await
.unwrap();
let community = ApubCommunity::from_apub(json, context, &mut request_counter)
.await
.unwrap();
// this makes one requests to the (intentionally broken) outbox collection
assert_eq!(request_counter, 1);
community
}
#[actix_rt::test]
#[serial]
async fn test_parse_lemmy_community() {
let context = init_context();
let site = parse_lemmy_instance(&context).await;
let community = parse_lemmy_community(&context).await;
assert_eq!(community.title, "Ten Forward");
assert!(!community.local);
assert_eq!(community.description.as_ref().unwrap().len(), 132);
Community::delete(&*context.pool().get().unwrap(), community.id).unwrap();
Site::delete(&*context.pool().get().unwrap(), site.id).unwrap();
}
}