454 lines
13 KiB
Rust
454 lines
13 KiB
Rust
use crate::{
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apub::{
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activities::send_activity,
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create_apub_response,
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create_apub_tombstone_response,
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create_tombstone,
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extensions::group_extensions::GroupExtension,
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fetcher::get_or_fetch_and_upsert_remote_user,
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get_shared_inbox,
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insert_activity,
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ActorType,
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FromApub,
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GroupExt,
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ToApub,
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},
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blocking,
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routes::DbPoolParam,
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DbPool,
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LemmyError,
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};
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use activitystreams_ext::Ext2;
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use activitystreams_new::{
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activity::{Accept, Announce, Delete, Follow, Remove, Undo},
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actor::{kind::GroupType, ApActor, Endpoints, Group},
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base::{AnyBase, BaseExt},
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collection::UnorderedCollection,
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context,
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object::Tombstone,
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prelude::*,
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public,
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};
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use actix_web::{body::Body, client::Client, web, HttpResponse};
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use itertools::Itertools;
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use lemmy_db::{
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community::{Community, CommunityForm},
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community_view::{CommunityFollowerView, CommunityModeratorView},
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naive_now,
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user::User_,
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};
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use lemmy_utils::convert_datetime;
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use serde::Deserialize;
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use url::Url;
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#[derive(Deserialize)]
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pub struct CommunityQuery {
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community_name: String,
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}
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#[async_trait::async_trait(?Send)]
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impl ToApub for Community {
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type Response = GroupExt;
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// Turn a Lemmy Community into an ActivityPub group that can be sent out over the network.
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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,
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// then the rest of the moderators
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// TODO Technically the instance admins can mod the community, but lets
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// ignore that for now
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let id = self.id;
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let moderators = blocking(pool, move |conn| {
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CommunityModeratorView::for_community(&conn, id)
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})
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.await??;
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let moderators: Vec<String> = moderators.into_iter().map(|m| m.user_actor_id).collect();
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let mut group = Group::new();
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group
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.set_context(context())
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.set_id(Url::parse(&self.actor_id)?)
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.set_name(self.name.to_owned())
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.set_published(convert_datetime(self.published))
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.set_many_attributed_tos(moderators);
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if let Some(u) = self.updated.to_owned() {
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group.set_updated(convert_datetime(u));
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}
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if let Some(d) = self.description.to_owned() {
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// TODO: this should be html, also add source field with raw markdown
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// -> same for post.content and others
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group.set_content(d);
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}
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let mut ap_actor = ApActor::new(self.get_inbox_url().parse()?, group);
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ap_actor
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.set_preferred_username(self.title.to_owned())
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.set_outbox(self.get_outbox_url().parse()?)
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.set_followers(self.get_followers_url().parse()?)
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.set_following(self.get_following_url().parse()?)
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.set_liked(self.get_liked_url().parse()?)
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.set_endpoints(Endpoints {
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shared_inbox: Some(self.get_shared_inbox_url().parse()?),
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..Default::default()
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});
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let nsfw = self.nsfw;
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let category_id = self.category_id;
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let group_extension = blocking(pool, move |conn| {
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GroupExtension::new(conn, category_id, nsfw)
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})
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.await??;
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Ok(Ext2::new(
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ap_actor,
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group_extension,
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self.get_public_key_ext(),
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))
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}
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fn to_tombstone(&self) -> Result<Tombstone, LemmyError> {
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create_tombstone(
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self.deleted,
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&self.actor_id,
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self.updated,
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GroupType::Group.to_string(),
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)
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}
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}
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#[async_trait::async_trait(?Send)]
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impl ActorType for Community {
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fn actor_id_str(&self) -> String {
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self.actor_id.to_owned()
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}
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fn public_key(&self) -> String {
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self.public_key.to_owned().unwrap()
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}
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fn private_key(&self) -> String {
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self.private_key.to_owned().unwrap()
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}
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/// As a local community, accept the follow request from a remote user.
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async fn send_accept_follow(
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&self,
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follow: Follow,
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client: &Client,
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pool: &DbPool,
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) -> Result<(), LemmyError> {
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let actor_uri = follow.actor()?.as_single_xsd_any_uri().unwrap().to_string();
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let id = format!("{}/accept/{}", self.actor_id, uuid::Uuid::new_v4());
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let mut accept = Accept::new(self.actor_id.to_owned(), follow.into_any_base()?);
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let to = format!("{}/inbox", actor_uri);
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accept
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.set_context(context())
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.set_id(Url::parse(&id)?)
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.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?;
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Ok(())
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}
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async fn send_delete(
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&self,
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creator: &User_,
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client: &Client,
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pool: &DbPool,
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) -> Result<(), LemmyError> {
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let group = self.to_apub(pool).await?;
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let id = format!("{}/delete/{}", self.actor_id, uuid::Uuid::new_v4());
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let mut delete = Delete::new(creator.actor_id.to_owned(), group.into_any_base()?);
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delete
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.set_context(context())
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.set_id(Url::parse(&id)?)
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.set_to(public())
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.set_many_ccs(vec![self.get_followers_url()]);
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insert_activity(self.creator_id, delete.clone(), true, pool).await?;
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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,
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// the community was the actor.
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// But for delete, the creator is the actor, and does the signing
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send_activity(client, &delete.into_any_base()?, creator, inboxes).await?;
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Ok(())
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}
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async fn send_undo_delete(
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&self,
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creator: &User_,
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client: &Client,
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pool: &DbPool,
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) -> Result<(), LemmyError> {
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let group = self.to_apub(pool).await?;
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let id = format!("{}/delete/{}", self.actor_id, uuid::Uuid::new_v4());
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let mut delete = Delete::new(creator.actor_id.to_owned(), group.into_any_base()?);
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delete
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.set_context(context())
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.set_id(Url::parse(&id)?)
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.set_to(public())
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.set_many_ccs(vec![self.get_followers_url()]);
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// TODO
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// Undo that fake activity
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let undo_id = format!("{}/undo/delete/{}", self.actor_id, uuid::Uuid::new_v4());
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let mut undo = Undo::new(creator.actor_id.to_owned(), delete.into_any_base()?);
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undo
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.set_context(context())
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.set_id(Url::parse(&undo_id)?)
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.set_to(public())
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.set_many_ccs(vec![self.get_followers_url()]);
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insert_activity(self.creator_id, undo.clone(), true, pool).await?;
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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,
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// the community was the actor.
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// But for delete, the creator is the actor, and does the signing
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send_activity(client, &undo.into_any_base()?, creator, inboxes).await?;
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Ok(())
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}
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async fn send_remove(
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&self,
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mod_: &User_,
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client: &Client,
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pool: &DbPool,
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) -> Result<(), LemmyError> {
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let group = self.to_apub(pool).await?;
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let id = format!("{}/remove/{}", self.actor_id, uuid::Uuid::new_v4());
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let mut remove = Remove::new(mod_.actor_id.to_owned(), group.into_any_base()?);
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remove
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.set_context(context())
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.set_id(Url::parse(&id)?)
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.set_to(public())
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.set_many_ccs(vec![self.get_followers_url()]);
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insert_activity(mod_.id, remove.clone(), true, pool).await?;
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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,
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// the community was the actor.
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// But for delete, the creator is the actor, and does the signing
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send_activity(client, &remove.into_any_base()?, mod_, inboxes).await?;
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Ok(())
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}
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async fn send_undo_remove(
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&self,
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mod_: &User_,
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client: &Client,
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pool: &DbPool,
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) -> Result<(), LemmyError> {
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let group = self.to_apub(pool).await?;
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let id = format!("{}/remove/{}", self.actor_id, uuid::Uuid::new_v4());
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let mut remove = Remove::new(mod_.actor_id.to_owned(), group.into_any_base()?);
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remove
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.set_context(context())
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.set_id(Url::parse(&id)?)
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.set_to(public())
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.set_many_ccs(vec![self.get_followers_url()]);
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// Undo that fake activity
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let undo_id = format!("{}/undo/remove/{}", self.actor_id, uuid::Uuid::new_v4());
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let mut undo = Undo::new(mod_.actor_id.to_owned(), remove.into_any_base()?);
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undo
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.set_context(context())
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.set_id(Url::parse(&undo_id)?)
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.set_to(public())
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.set_many_ccs(vec![self.get_followers_url()]);
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insert_activity(mod_.id, undo.clone(), true, pool).await?;
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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,
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// the community was the actor.
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// But for remove , the creator is the actor, and does the signing
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send_activity(client, &undo.into_any_base()?, mod_, inboxes).await?;
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Ok(())
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}
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/// For a given community, returns the inboxes of all followers.
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async fn get_follower_inboxes(&self, pool: &DbPool) -> Result<Vec<String>, LemmyError> {
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let id = self.id;
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let inboxes = blocking(pool, move |conn| {
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CommunityFollowerView::for_community(conn, id)
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})
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.await??;
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let inboxes = inboxes
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.into_iter()
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.map(|c| get_shared_inbox(&Url::parse(&c.user_actor_id).unwrap()))
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.filter(|s| !s.is_empty())
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.unique()
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.collect();
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Ok(inboxes)
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}
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async fn send_follow(
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&self,
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_follow_actor_id: &str,
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_client: &Client,
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_pool: &DbPool,
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) -> Result<(), LemmyError> {
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unimplemented!()
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}
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async fn send_unfollow(
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&self,
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_follow_actor_id: &str,
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_client: &Client,
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_pool: &DbPool,
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) -> Result<(), LemmyError> {
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unimplemented!()
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}
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}
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#[async_trait::async_trait(?Send)]
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impl FromApub for CommunityForm {
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type ApubType = GroupExt;
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/// Parse an ActivityPub group received from another instance into a Lemmy community.
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async fn from_apub(
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group: &GroupExt,
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client: &Client,
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pool: &DbPool,
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actor_id: &Url,
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) -> Result<Self, LemmyError> {
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let creator_and_moderator_uris = group.inner.attributed_to().unwrap();
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let creator_uri = creator_and_moderator_uris
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.as_many()
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.unwrap()
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.iter()
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.next()
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.unwrap()
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.as_xsd_any_uri()
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.unwrap();
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let creator = get_or_fetch_and_upsert_remote_user(creator_uri, client, pool).await?;
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Ok(CommunityForm {
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name: group
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.inner
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.name()
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.unwrap()
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.as_one()
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.unwrap()
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.as_xsd_string()
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.unwrap()
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.into(),
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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)
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// -> same for post.content etc
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description: group
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.inner
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.content()
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.map(|s| s.as_single_xsd_string().unwrap().into()),
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category_id: group.ext_one.category.identifier.parse::<i32>()?,
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creator_id: creator.id,
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removed: None,
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published: group.inner.published().map(|u| u.to_owned().naive_local()),
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updated: group.inner.updated().map(|u| u.to_owned().naive_local()),
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deleted: None,
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nsfw: group.ext_one.sensitive,
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actor_id: group
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.inner
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.id(actor_id.domain().unwrap())?
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.unwrap()
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.to_string(),
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local: false,
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private_key: None,
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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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})
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}
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}
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/// Return the community json over HTTP.
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pub async fn get_apub_community_http(
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info: web::Path<CommunityQuery>,
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db: DbPoolParam,
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) -> Result<HttpResponse<Body>, LemmyError> {
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let community = blocking(&db, move |conn| {
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Community::read_from_name(conn, &info.community_name)
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})
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.await??;
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if !community.deleted {
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let apub = community.to_apub(&db).await?;
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Ok(create_apub_response(&apub))
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} else {
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Ok(create_apub_tombstone_response(&community.to_tombstone()?))
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}
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}
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/// Returns an empty followers collection, only populating the size (for privacy).
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pub async fn get_apub_community_followers(
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info: web::Path<CommunityQuery>,
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db: DbPoolParam,
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) -> Result<HttpResponse<Body>, LemmyError> {
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let community = blocking(&db, move |conn| {
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Community::read_from_name(&conn, &info.community_name)
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})
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.await??;
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let community_id = community.id;
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let community_followers = blocking(&db, move |conn| {
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CommunityFollowerView::for_community(&conn, community_id)
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})
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.await??;
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let mut collection = UnorderedCollection::new(vec![]);
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collection
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.set_context(context())
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// TODO: this needs its own ID
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.set_id(community.actor_id.parse()?)
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.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(
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activity: AnyBase,
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community: &Community,
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sender: &dyn ActorType,
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client: &Client,
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pool: &DbPool,
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) -> Result<HttpResponse, LemmyError> {
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let id = format!("{}/announce/{}", community.actor_id, uuid::Uuid::new_v4());
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let mut announce = Announce::new(community.actor_id.to_owned(), activity);
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announce
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.set_context(context())
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.set_id(Url::parse(&id)?)
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.set_to(public())
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.set_many_ccs(vec![community.get_followers_url()]);
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insert_activity(community.creator_id, announce.clone(), true, pool).await?;
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// dont send to the instance where the activity originally came from, because that would result
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// in a database error (same data inserted twice)
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let mut to = community.get_follower_inboxes(pool).await?;
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// this seems to be the "easiest" stable alternative for remove_item()
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to.retain(|x| *x != sender.get_shared_inbox_url());
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send_activity(client, &announce.into_any_base()?, community, to).await?;
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Ok(HttpResponse::Ok().finish())
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}
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