lemmy/server/src/apub/community.rs

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use crate::{
api::{check_slurs, check_slurs_opt},
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apub::{
activities::{generate_activity_id, send_activity},
check_actor_domain,
create_apub_response,
create_apub_tombstone_response,
create_tombstone,
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extensions::group_extensions::GroupExtension,
fetcher::get_or_fetch_and_upsert_user,
get_shared_inbox,
insert_activity,
ActorType,
FromApub,
GroupExt,
ToApub,
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},
blocking,
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routes::DbPoolParam,
DbPool,
LemmyError,
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};
use activitystreams::{
activity::{
kind::{AcceptType, AnnounceType, DeleteType, LikeType, RemoveType, UndoType},
Accept,
Announce,
Delete,
Follow,
Remove,
Undo,
},
actor::{kind::GroupType, ApActor, Endpoints, Group},
base::{AnyBase, BaseExt},
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collection::{OrderedCollection, UnorderedCollection},
context,
object::{Image, Tombstone},
prelude::*,
public,
};
use activitystreams_ext::Ext2;
use actix_web::{body::Body, client::Client, web, HttpResponse};
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use itertools::Itertools;
use lemmy_db::{
community::{Community, CommunityForm},
community_view::{CommunityFollowerView, CommunityModeratorView},
naive_now,
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post::Post,
user::User_,
};
use lemmy_utils::convert_datetime;
use serde::Deserialize;
use url::Url;
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#[derive(Deserialize)]
pub struct CommunityQuery {
community_name: String,
}
#[async_trait::async_trait(?Send)]
impl ToApub for Community {
type Response = GroupExt;
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// Turn a Lemmy Community into an ActivityPub group that can be sent out over the network.
async fn to_apub(&self, pool: &DbPool) -> Result<GroupExt, LemmyError> {
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// The attributed to, is an ordered vector with the creator actor_ids first,
// then the rest of the moderators
// TODO Technically the instance admins can mod the community, but lets
// ignore that for now
let id = self.id;
let moderators = blocking(pool, move |conn| {
CommunityModeratorView::for_community(&conn, id)
})
.await??;
let moderators: Vec<String> = moderators.into_iter().map(|m| m.user_actor_id).collect();
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let mut group = Group::new();
group
.set_context(context())
.set_id(Url::parse(&self.actor_id)?)
.set_name(self.name.to_owned())
.set_published(convert_datetime(self.published))
.set_many_attributed_tos(moderators);
if let Some(u) = self.updated.to_owned() {
group.set_updated(convert_datetime(u));
}
if let Some(d) = self.description.to_owned() {
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// TODO: this should be html, also add source field with raw markdown
// -> same for post.content and others
group.set_content(d);
}
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let mut ap_actor = ApActor::new(self.get_inbox_url()?, group);
ap_actor
.set_preferred_username(self.title.to_owned())
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.set_outbox(self.get_outbox_url()?)
.set_followers(self.get_followers_url().parse()?)
.set_following(self.get_following_url().parse()?)
.set_liked(self.get_liked_url().parse()?)
.set_endpoints(Endpoints {
shared_inbox: Some(self.get_shared_inbox_url().parse()?),
..Default::default()
});
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let nsfw = self.nsfw;
let category_id = self.category_id;
let group_extension = blocking(pool, move |conn| {
GroupExtension::new(conn, category_id, nsfw)
})
.await??;
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Ok(Ext2::new(
ap_actor,
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group_extension,
self.get_public_key_ext(),
))
}
fn to_tombstone(&self) -> Result<Tombstone, LemmyError> {
create_tombstone(self.deleted, &self.actor_id, self.updated, GroupType::Group)
}
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}
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#[async_trait::async_trait(?Send)]
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impl ActorType for Community {
fn actor_id_str(&self) -> String {
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self.actor_id.to_owned()
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}
fn public_key(&self) -> String {
self.public_key.to_owned().unwrap()
}
fn private_key(&self) -> String {
self.private_key.to_owned().unwrap()
}
/// As a local community, accept the follow request from a remote user.
async fn send_accept_follow(
&self,
follow: Follow,
client: &Client,
pool: &DbPool,
) -> Result<(), LemmyError> {
let actor_uri = follow.actor()?.as_single_xsd_any_uri().unwrap().to_string();
let mut accept = Accept::new(self.actor_id.to_owned(), follow.into_any_base()?);
let to = format!("{}/inbox", actor_uri);
accept
.set_context(context())
.set_id(generate_activity_id(AcceptType::Accept)?)
.set_to(to.clone());
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insert_activity(self.creator_id, accept.clone(), true, pool).await?;
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send_activity(client, &accept.into_any_base()?, self, vec![to]).await?;
Ok(())
}
async fn send_delete(
&self,
creator: &User_,
client: &Client,
pool: &DbPool,
) -> Result<(), LemmyError> {
let group = self.to_apub(pool).await?;
let mut delete = Delete::new(creator.actor_id.to_owned(), group.into_any_base()?);
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delete
.set_context(context())
.set_id(generate_activity_id(DeleteType::Delete)?)
.set_to(public())
.set_many_ccs(vec![self.get_followers_url()]);
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insert_activity(self.creator_id, delete.clone(), true, pool).await?;
let inboxes = self.get_follower_inboxes(pool).await?;
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// Note: For an accept, since it was automatic, no one pushed a button,
// the community was the actor.
// But for delete, the creator is the actor, and does the signing
send_activity(client, &delete.into_any_base()?, creator, inboxes).await?;
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Ok(())
}
async fn send_undo_delete(
&self,
creator: &User_,
client: &Client,
pool: &DbPool,
) -> Result<(), LemmyError> {
let group = self.to_apub(pool).await?;
let mut delete = Delete::new(creator.actor_id.to_owned(), group.into_any_base()?);
delete
.set_context(context())
.set_id(generate_activity_id(DeleteType::Delete)?)
.set_to(public())
.set_many_ccs(vec![self.get_followers_url()]);
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// TODO
// Undo that fake activity
let mut undo = Undo::new(creator.actor_id.to_owned(), delete.into_any_base()?);
undo
.set_context(context())
.set_id(generate_activity_id(UndoType::Undo)?)
.set_to(public())
.set_many_ccs(vec![self.get_followers_url()]);
insert_activity(self.creator_id, undo.clone(), true, pool).await?;
let inboxes = self.get_follower_inboxes(pool).await?;
// Note: For an accept, since it was automatic, no one pushed a button,
// the community was the actor.
// But for delete, the creator is the actor, and does the signing
send_activity(client, &undo.into_any_base()?, creator, inboxes).await?;
Ok(())
}
async fn send_remove(
&self,
mod_: &User_,
client: &Client,
pool: &DbPool,
) -> Result<(), LemmyError> {
let group = self.to_apub(pool).await?;
let mut remove = Remove::new(mod_.actor_id.to_owned(), group.into_any_base()?);
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remove
.set_context(context())
.set_id(generate_activity_id(RemoveType::Remove)?)
.set_to(public())
.set_many_ccs(vec![self.get_followers_url()]);
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insert_activity(mod_.id, remove.clone(), true, pool).await?;
let inboxes = self.get_follower_inboxes(pool).await?;
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// Note: For an accept, since it was automatic, no one pushed a button,
// the community was the actor.
// But for delete, the creator is the actor, and does the signing
send_activity(client, &remove.into_any_base()?, mod_, inboxes).await?;
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Ok(())
}
async fn send_undo_remove(
&self,
mod_: &User_,
client: &Client,
pool: &DbPool,
) -> Result<(), LemmyError> {
let group = self.to_apub(pool).await?;
let mut remove = Remove::new(mod_.actor_id.to_owned(), group.into_any_base()?);
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remove
.set_context(context())
.set_id(generate_activity_id(RemoveType::Remove)?)
.set_to(public())
.set_many_ccs(vec![self.get_followers_url()]);
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// Undo that fake activity
let mut undo = Undo::new(mod_.actor_id.to_owned(), remove.into_any_base()?);
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undo
.set_context(context())
.set_id(generate_activity_id(LikeType::Like)?)
.set_to(public())
.set_many_ccs(vec![self.get_followers_url()]);
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insert_activity(mod_.id, undo.clone(), true, pool).await?;
let inboxes = self.get_follower_inboxes(pool).await?;
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// Note: For an accept, since it was automatic, no one pushed a button,
// the community was the actor.
// But for remove , the creator is the actor, and does the signing
send_activity(client, &undo.into_any_base()?, mod_, inboxes).await?;
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Ok(())
}
/// For a given community, returns the inboxes of all followers.
async fn get_follower_inboxes(&self, pool: &DbPool) -> Result<Vec<String>, LemmyError> {
let id = self.id;
let inboxes = blocking(pool, move |conn| {
CommunityFollowerView::for_community(conn, id)
})
.await??;
let inboxes = inboxes
.into_iter()
.map(|c| get_shared_inbox(&Url::parse(&c.user_actor_id).unwrap()))
.filter(|s| !s.is_empty())
.unique()
.collect();
Ok(inboxes)
}
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async fn send_follow(
&self,
_follow_actor_id: &str,
_client: &Client,
_pool: &DbPool,
) -> Result<(), LemmyError> {
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unimplemented!()
}
async fn send_unfollow(
&self,
_follow_actor_id: &str,
_client: &Client,
_pool: &DbPool,
) -> Result<(), LemmyError> {
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unimplemented!()
}
fn user_id(&self) -> i32 {
self.creator_id
}
}
#[async_trait::async_trait(?Send)]
impl FromApub for CommunityForm {
type ApubType = GroupExt;
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/// Parse an ActivityPub group received from another instance into a Lemmy community.
async fn from_apub(
group: &GroupExt,
client: &Client,
pool: &DbPool,
expected_domain: Option<Url>,
) -> Result<Self, LemmyError> {
let creator_and_moderator_uris = group.inner.attributed_to().unwrap();
let creator_uri = creator_and_moderator_uris
.as_many()
.unwrap()
.iter()
.next()
.unwrap()
.as_xsd_any_uri()
.unwrap();
let creator = get_or_fetch_and_upsert_user(creator_uri, client, pool).await?;
let name = group
.inner
.name()
.unwrap()
.as_one()
.unwrap()
.as_xsd_string()
.unwrap()
.to_string();
let title = group.inner.preferred_username().unwrap().to_string();
// TODO: should be parsed as html and tags like <script> removed (or use markdown source)
// -> same for post.content etc
let description = group
.inner
.content()
.map(|s| s.as_single_xsd_string().unwrap().into());
check_slurs(&name)?;
check_slurs(&title)?;
check_slurs_opt(&description)?;
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let icon = match group.icon() {
Some(any_image) => Some(
Image::from_any_base(any_image.as_one().unwrap().clone())
.unwrap()
.unwrap()
.url()
.unwrap()
.as_single_xsd_any_uri()
.map(|u| u.to_string()),
),
None => None,
};
let banner = match group.image() {
Some(any_image) => Some(
Image::from_any_base(any_image.as_one().unwrap().clone())
.unwrap()
.unwrap()
.url()
.unwrap()
.as_single_xsd_any_uri()
.map(|u| u.to_string()),
),
None => None,
};
Ok(CommunityForm {
name,
title,
description,
category_id: group.ext_one.category.identifier.parse::<i32>()?,
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creator_id: creator.id,
removed: None,
published: group.inner.published().map(|u| u.to_owned().naive_local()),
updated: group.inner.updated().map(|u| u.to_owned().naive_local()),
deleted: None,
nsfw: group.ext_one.sensitive,
actor_id: check_actor_domain(group, expected_domain)?,
local: false,
private_key: None,
public_key: Some(group.ext_two.to_owned().public_key.public_key_pem),
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last_refreshed_at: Some(naive_now()),
icon,
banner,
})
}
}
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/// Return the community json over HTTP.
pub async fn get_apub_community_http(
info: web::Path<CommunityQuery>,
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db: DbPoolParam,
) -> Result<HttpResponse<Body>, LemmyError> {
let community = blocking(&db, move |conn| {
Community::read_from_name(conn, &info.community_name)
})
.await??;
if !community.deleted {
let apub = community.to_apub(&db).await?;
Ok(create_apub_response(&apub))
} else {
Ok(create_apub_tombstone_response(&community.to_tombstone()?))
}
}
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/// Returns an empty followers collection, only populating the size (for privacy).
pub async fn get_apub_community_followers(
info: web::Path<CommunityQuery>,
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db: DbPoolParam,
) -> Result<HttpResponse<Body>, LemmyError> {
let community = blocking(&db, move |conn| {
Community::read_from_name(&conn, &info.community_name)
})
.await??;
let community_id = community.id;
let community_followers = blocking(&db, move |conn| {
CommunityFollowerView::for_community(&conn, community_id)
})
.await??;
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let mut collection = UnorderedCollection::new();
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collection
.set_context(context())
// TODO: this needs its own ID
.set_id(community.actor_id.parse()?)
.set_total_items(community_followers.len() as u64);
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Ok(create_apub_response(&collection))
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}
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pub async fn get_apub_community_outbox(
info: web::Path<CommunityQuery>,
db: DbPoolParam,
) -> Result<HttpResponse<Body>, LemmyError> {
let community = blocking(&db, move |conn| {
Community::read_from_name(&conn, &info.community_name)
})
.await??;
let community_id = community.id;
let posts = blocking(&db, move |conn| {
Post::list_for_community(conn, community_id)
})
.await??;
let mut pages: Vec<AnyBase> = vec![];
for p in posts {
pages.push(p.to_apub(&db).await?.into_any_base()?);
}
let len = pages.len();
let mut collection = OrderedCollection::new();
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collection
.set_many_items(pages)
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.set_context(context())
.set_id(community.get_outbox_url()?)
.set_total_items(len as u64);
Ok(create_apub_response(&collection))
}
pub async fn do_announce(
activity: AnyBase,
community: &Community,
sender: &User_,
client: &Client,
pool: &DbPool,
) -> Result<(), LemmyError> {
let mut announce = Announce::new(community.actor_id.to_owned(), activity);
announce
.set_context(context())
.set_id(generate_activity_id(AnnounceType::Announce)?)
.set_to(public())
.set_many_ccs(vec![community.get_followers_url()]);
insert_activity(community.creator_id, announce.clone(), true, pool).await?;
let mut to = community.get_follower_inboxes(pool).await?;
// dont send to the local instance, nor to the instance where the activity originally came from,
// because that would result in a database error (same data inserted twice)
// this seems to be the "easiest" stable alternative for remove_item()
to.retain(|x| *x != sender.get_shared_inbox_url());
to.retain(|x| *x != community.get_shared_inbox_url());
send_activity(client, &announce.into_any_base()?, community, to).await?;
Ok(())
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}