lemmy/server/src/apub/community.rs

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use crate::{
apub::{
activities::{populate_object_props, send_activity},
create_apub_response, create_apub_tombstone_response, create_tombstone,
extensions::group_extensions::GroupExtension,
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fetcher::get_or_fetch_and_upsert_remote_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::{
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activity::{Accept, Announce, Delete, Remove, Undo},
Activity, Base, BaseBox,
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};
use activitystreams_ext::Ext2;
use activitystreams_new::{
activity::Follow,
actor::{kind::GroupType, ApActor, Endpoints, Group},
base::BaseExt,
collection::UnorderedCollection,
context,
object::Tombstone,
prelude::*,
primitives::{XsdAnyUri, XsdDateTime},
};
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,
user::User_,
};
use lemmy_utils::convert_datetime;
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use serde::{Deserialize, Serialize};
use std::{fmt::Debug, str::FromStr};
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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(XsdAnyUri::from_str(&self.actor_id)?)
.set_name(self.name.to_owned())
.set_published(XsdDateTime::from(convert_datetime(self.published)))
.set_many_attributed_tos(moderators);
if let Some(u) = self.updated.to_owned() {
group.set_updated(XsdDateTime::from(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().parse()?, group);
ap_actor
.set_preferred_username(self.title.to_owned())
.set_outbox(self.get_outbox_url().parse()?)
.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.to_string(),
)
}
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}
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#[async_trait::async_trait(?Send)]
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impl ActorType for Community {
fn actor_id(&self) -> String {
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> {
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let actor_uri = follow.actor.as_single_xsd_any_uri().unwrap().to_string();
let id = format!("{}/accept/{}", self.actor_id, uuid::Uuid::new_v4());
let mut accept = Accept::new();
accept
.object_props
.set_context_xsd_any_uri(context())?
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.set_id(id)?;
accept
.accept_props
.set_actor_xsd_any_uri(self.actor_id.to_owned())?
.set_object_base_box(BaseBox::from_concrete(follow.clone())?)?;
let to = format!("{}/inbox", actor_uri);
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insert_activity(self.creator_id, accept.clone(), true, pool).await?;
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send_activity(client, &accept, 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 id = format!("{}/delete/{}", self.actor_id, uuid::Uuid::new_v4());
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let mut delete = Delete::default();
populate_object_props(
&mut delete.object_props,
vec![self.get_followers_url()],
&id,
)?;
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delete
.delete_props
.set_actor_xsd_any_uri(creator.actor_id.to_owned())?
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.set_object_base_box(BaseBox::from_concrete(group)?)?;
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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, 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 id = format!("{}/delete/{}", self.actor_id, uuid::Uuid::new_v4());
let mut delete = Delete::default();
populate_object_props(
&mut delete.object_props,
vec![self.get_followers_url()],
&id,
)?;
delete
.delete_props
.set_actor_xsd_any_uri(creator.actor_id.to_owned())?
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.set_object_base_box(BaseBox::from_concrete(group)?)?;
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// TODO
// Undo that fake activity
let undo_id = format!("{}/undo/delete/{}", self.actor_id, uuid::Uuid::new_v4());
let mut undo = Undo::default();
populate_object_props(
&mut undo.object_props,
vec![self.get_followers_url()],
&undo_id,
)?;
undo
.undo_props
.set_actor_xsd_any_uri(creator.actor_id.to_owned())?
.set_object_base_box(delete)?;
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, creator, inboxes).await?;
Ok(())
}
async fn send_remove(
&self,
mod_: &User_,
client: &Client,
pool: &DbPool,
) -> Result<(), LemmyError> {
let group = self.to_apub(pool).await?;
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let id = format!("{}/remove/{}", self.actor_id, uuid::Uuid::new_v4());
let mut remove = Remove::default();
populate_object_props(
&mut remove.object_props,
vec![self.get_followers_url()],
&id,
)?;
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remove
.remove_props
.set_actor_xsd_any_uri(mod_.actor_id.to_owned())?
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.set_object_base_box(BaseBox::from_concrete(group)?)?;
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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, 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?;
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let id = format!("{}/remove/{}", self.actor_id, uuid::Uuid::new_v4());
let mut remove = Remove::default();
populate_object_props(
&mut remove.object_props,
vec![self.get_followers_url()],
&id,
)?;
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remove
.remove_props
.set_actor_xsd_any_uri(mod_.actor_id.to_owned())?
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.set_object_base_box(BaseBox::from_concrete(group)?)?;
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// Undo that fake activity
let undo_id = format!("{}/undo/remove/{}", self.actor_id, uuid::Uuid::new_v4());
let mut undo = Undo::default();
populate_object_props(
&mut undo.object_props,
vec![self.get_followers_url()],
&undo_id,
)?;
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undo
.undo_props
.set_actor_xsd_any_uri(mod_.actor_id.to_owned())?
.set_object_base_box(remove)?;
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, 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(&c.user_actor_id))
.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!()
}
}
#[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) -> Result<Self, LemmyError> {
let creator_and_moderator_uris = group.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_remote_user(creator_uri, client, pool).await?;
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Ok(CommunityForm {
name: group.name().unwrap().as_single_xsd_string().unwrap().into(),
title: group.inner.preferred_username().unwrap().to_string(),
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// TODO: should be parsed as html and tags like <script> removed (or use markdown source)
// -> same for post.content etc
description: group
.content()
.map(|s| s.as_single_xsd_string().unwrap().into()),
category_id: group.ext_one.category.identifier.parse::<i32>()?,
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creator_id: creator.id,
removed: None,
published: group
.published()
.map(|u| u.as_ref().to_owned().naive_local()),
updated: group.updated().map(|u| u.as_ref().to_owned().naive_local()),
deleted: None,
nsfw: group.ext_one.sensitive,
actor_id: group.id().unwrap().to_string(),
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()),
})
}
}
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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(vec![]);
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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 do_announce<A>(
activity: A,
community: &Community,
sender: &dyn ActorType,
client: &Client,
pool: &DbPool,
) -> Result<HttpResponse, LemmyError>
where
A: Activity + Base + Serialize + Debug,
{
let mut announce = Announce::default();
populate_object_props(
&mut announce.object_props,
vec![community.get_followers_url()],
&format!("{}/announce/{}", community.actor_id, uuid::Uuid::new_v4()),
)?;
announce
.announce_props
.set_actor_xsd_any_uri(community.actor_id.to_owned())?
.set_object_base_box(BaseBox::from_concrete(activity)?)?;
insert_activity(community.creator_id, announce.clone(), true, pool).await?;
// dont send to the instance where the activity originally came from, because that would result
// in a database error (same data inserted twice)
let mut to = community.get_follower_inboxes(pool).await?;
// this seems to be the "easiest" stable alternative for remove_item()
to.retain(|x| *x != sender.get_shared_inbox_url());
send_activity(client, &announce, community, to).await?;
Ok(HttpResponse::Ok().finish())
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}