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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, signatures::PublicKey},
fetcher::get_or_fetch_and_upsert_remote_user,
get_shared_inbox,
ActorType,
FromApub,
GroupExt,
ToApub,
},
convert_datetime,
db::{
activity::insert_activity,
community::{Community, CommunityForm},
community_view::{CommunityFollowerView, CommunityModeratorView},
user::User_,
},
naive_now,
routes::DbPoolParam,
};
use activitystreams::{
activity::{Accept, Announce, Delete, Remove, Undo},
actor::{kind::GroupType, properties::ApActorProperties, Group},
collection::UnorderedCollection,
context,
endpoint::EndpointProperties,
object::properties::ObjectProperties,
Activity,
Base,
BaseBox,
};
use activitystreams_ext::Ext3;
use activitystreams_new::{activity::Follow, object::Tombstone};
use actix_web::{body::Body, web::Path, HttpResponse, Result};
use diesel::PgConnection;
use failure::{Error, _core::fmt::Debug};
use itertools::Itertools;
use serde::{Deserialize, Serialize};
#[derive(Deserialize)]
pub struct CommunityQuery {
community_name: String,
}
impl ToApub for Community {
type Response = GroupExt;
// Turn a Lemmy Community into an ActivityPub group that can be sent out over the network.
fn to_apub(&self, conn: &PgConnection) -> Result<GroupExt, Error> {
let mut group = Group::default();
let oprops: &mut ObjectProperties = group.as_mut();
// 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 moderators = CommunityModeratorView::for_community(&conn, self.id)?
.into_iter()
.map(|m| m.user_actor_id)
.collect();
oprops
.set_context_xsd_any_uri(context())?
.set_id(self.actor_id.to_owned())?
.set_name_xsd_string(self.name.to_owned())?
.set_published(convert_datetime(self.published))?
.set_many_attributed_to_xsd_any_uris(moderators)?;
if let Some(u) = self.updated.to_owned() {
oprops.set_updated(convert_datetime(u))?;
}
if let Some(d) = self.description.to_owned() {
// TODO: this should be html, also add source field with raw markdown
// -> same for post.content and others
oprops.set_summary_xsd_string(d)?;
}
let mut endpoint_props = EndpointProperties::default();
endpoint_props.set_shared_inbox(self.get_shared_inbox_url())?;
let mut actor_props = ApActorProperties::default();
actor_props
.set_preferred_username(self.title.to_owned())?
.set_inbox(self.get_inbox_url())?
.set_outbox(self.get_outbox_url())?
.set_endpoints(endpoint_props)?
.set_followers(self.get_followers_url())?;
let group_extension = GroupExtension::new(conn, self.category_id, self.nsfw)?;
Ok(Ext3::new(
group,
group_extension,
actor_props,
self.get_public_key_ext(),
))
}
fn to_tombstone(&self) -> Result<Tombstone, Error> {
create_tombstone(
self.deleted,
&self.actor_id,
self.updated,
GroupType.to_string(),
)
}
}
impl ActorType for Community {
fn actor_id(&self) -> String {
self.actor_id.to_owned()
}
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.
fn send_accept_follow(&self, follow: &Follow, conn: &PgConnection) -> Result<(), Error> {
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())?
.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);
insert_activity(&conn, self.creator_id, &accept, true)?;
send_activity(&accept, self, vec![to])?;
Ok(())
}
fn send_delete(&self, creator: &User_, conn: &PgConnection) -> Result<(), Error> {
let group = self.to_apub(conn)?;
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())?
.set_object_base_box(BaseBox::from_concrete(group)?)?;
insert_activity(&conn, self.creator_id, &delete, true)?;
// 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(&delete, creator, self.get_follower_inboxes(&conn)?)?;
Ok(())
}
fn send_undo_delete(&self, creator: &User_, conn: &PgConnection) -> Result<(), Error> {
let group = self.to_apub(conn)?;
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())?
.set_object_base_box(BaseBox::from_concrete(group)?)?;
// 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(&conn, self.creator_id, &undo, true)?;
// 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(&undo, creator, self.get_follower_inboxes(&conn)?)?;
Ok(())
}
fn send_remove(&self, mod_: &User_, conn: &PgConnection) -> Result<(), Error> {
let group = self.to_apub(conn)?;
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,
)?;
remove
.remove_props
.set_actor_xsd_any_uri(mod_.actor_id.to_owned())?
.set_object_base_box(BaseBox::from_concrete(group)?)?;
insert_activity(&conn, mod_.id, &remove, true)?;
// 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(&remove, mod_, self.get_follower_inboxes(&conn)?)?;
Ok(())
}
fn send_undo_remove(&self, mod_: &User_, conn: &PgConnection) -> Result<(), Error> {
let group = self.to_apub(conn)?;
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,
)?;
remove
.remove_props
.set_actor_xsd_any_uri(mod_.actor_id.to_owned())?
.set_object_base_box(BaseBox::from_concrete(group)?)?;
// 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,
)?;
undo
.undo_props
.set_actor_xsd_any_uri(mod_.actor_id.to_owned())?
.set_object_base_box(remove)?;
insert_activity(&conn, mod_.id, &undo, true)?;
// 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(&undo, mod_, self.get_follower_inboxes(&conn)?)?;
Ok(())
}
/// For a given community, returns the inboxes of all followers.
fn get_follower_inboxes(&self, conn: &PgConnection) -> Result<Vec<String>, Error> {
Ok(
CommunityFollowerView::for_community(conn, self.id)?
.into_iter()
.map(|c| get_shared_inbox(&c.user_actor_id))
.filter(|s| !s.is_empty())
.unique()
.collect(),
)
}
fn send_follow(&self, _follow_actor_id: &str, _conn: &PgConnection) -> Result<(), Error> {
unimplemented!()
}
fn send_unfollow(&self, _follow_actor_id: &str, _conn: &PgConnection) -> Result<(), Error> {
unimplemented!()
}
}
impl FromApub for CommunityForm {
type ApubType = GroupExt;
/// Parse an ActivityPub group received from another instance into a Lemmy community.
fn from_apub(group: &GroupExt, conn: &PgConnection) -> Result<Self, Error> {
let group_extensions: &GroupExtension = &group.ext_one;
let oprops = &group.inner.object_props;
let aprops = &group.ext_two;
let public_key: &PublicKey = &group.ext_three.public_key;
let mut creator_and_moderator_uris = oprops.get_many_attributed_to_xsd_any_uris().unwrap();
let creator = creator_and_moderator_uris
.next()
.map(|c| get_or_fetch_and_upsert_remote_user(&c.to_string(), &conn).unwrap())
.unwrap();
Ok(CommunityForm {
name: oprops.get_name_xsd_string().unwrap().to_string(),
title: aprops.get_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
description: oprops.get_content_xsd_string().map(|s| s.to_string()),
category_id: group_extensions.category.identifier.parse::<i32>()?,
creator_id: creator.id,
removed: None,
published: oprops
.get_published()
.map(|u| u.as_ref().to_owned().naive_local()),
updated: oprops
.get_updated()
.map(|u| u.as_ref().to_owned().naive_local()),
deleted: None,
nsfw: group_extensions.sensitive,
actor_id: oprops.get_id().unwrap().to_string(),
local: false,
private_key: None,
public_key: Some(public_key.to_owned().public_key_pem),
last_refreshed_at: Some(naive_now()),
})
}
}
/// Return the community json over HTTP.
pub async fn get_apub_community_http(
info: Path<CommunityQuery>,
db: DbPoolParam,
) -> Result<HttpResponse<Body>, Error> {
let community = Community::read_from_name(&&db.get()?, &info.community_name)?;
if !community.deleted {
Ok(create_apub_response(
&community.to_apub(&db.get().unwrap())?,
))
} else {
Ok(create_apub_tombstone_response(&community.to_tombstone()?))
}
}
/// Returns an empty followers collection, only populating the size (for privacy).
pub async fn get_apub_community_followers(
info: Path<CommunityQuery>,
db: DbPoolParam,
) -> Result<HttpResponse<Body>, Error> {
let community = Community::read_from_name(&&db.get()?, &info.community_name)?;
let conn = db.get()?;
//As we are an object, we validated that the community id was valid
let community_followers = CommunityFollowerView::for_community(&conn, community.id).unwrap();
let mut collection = UnorderedCollection::default();
let oprops: &mut ObjectProperties = collection.as_mut();
oprops
.set_context_xsd_any_uri(context())?
.set_id(community.actor_id)?;
collection
.collection_props
.set_total_items(community_followers.len() as u64)?;
Ok(create_apub_response(&collection))
}
impl Community {
pub fn do_announce<A>(
activity: A,
community: &Community,
sender: &dyn ActorType,
conn: &PgConnection,
) -> Result<HttpResponse, Error>
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(&conn, community.creator_id, &announce, true)?;
// 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(&conn)?;
// this seems to be the "easiest" stable alternative for remove_item()
to.retain(|x| *x != sender.get_shared_inbox_url());
send_activity(&announce, community, to)?;
Ok(HttpResponse::Ok().finish())
}
}