3 fetch::fetch_remote_object,
5 person::get_or_fetch_and_upsert_person,
11 use activitystreams::{
13 collection::{CollectionExt, OrderedCollection},
16 use diesel::result::Error::NotFound;
17 use lemmy_api_common::blocking;
18 use lemmy_db_queries::{source::community::Community_, ApubObject, Joinable};
19 use lemmy_db_schema::source::community::{Community, CommunityModerator, CommunityModeratorForm};
20 use lemmy_db_views_actor::community_moderator_view::CommunityModeratorView;
21 use lemmy_utils::{location_info, LemmyError};
22 use lemmy_websocket::LemmyContext;
26 /// Get a community from its apub ID.
28 /// If it exists locally and `!should_refetch_actor()`, it is returned directly from the database.
29 /// Otherwise it is fetched from the remote instance, stored and returned.
30 pub async fn get_or_fetch_and_upsert_community(
32 context: &LemmyContext,
33 recursion_counter: &mut i32,
34 ) -> Result<Community, LemmyError> {
35 let apub_id_owned = apub_id.to_owned();
36 let community = blocking(context.pool(), move |conn| {
37 Community::read_from_apub_id(conn, &apub_id_owned.into())
42 Ok(c) if !c.local && should_refetch_actor(c.last_refreshed_at) => {
43 debug!("Fetching and updating from remote community: {}", apub_id);
44 fetch_remote_community(apub_id, context, Some(c), recursion_counter).await
48 debug!("Fetching and creating remote community: {}", apub_id);
49 fetch_remote_community(apub_id, context, None, recursion_counter).await
51 Err(e) => Err(e.into()),
55 /// Request a community by apub ID from a remote instance, including moderators. If `old_community`,
56 /// is set, this is an update for a community which is already known locally. If not, we don't know
57 /// the community yet and also pull the outbox, to get some initial posts.
58 async fn fetch_remote_community(
60 context: &LemmyContext,
61 old_community: Option<Community>,
62 request_counter: &mut i32,
63 ) -> Result<Community, LemmyError> {
64 let group = fetch_remote_object::<GroupExt>(context.client(), apub_id, request_counter).await;
66 if let Some(c) = old_community.to_owned() {
67 if is_deleted(&group) {
68 blocking(context.pool(), move |conn| {
69 Community::update_deleted(conn, c.id, true)
72 } else if group.is_err() {
73 // If fetching failed, return the existing data.
80 Community::from_apub(&group, context, apub_id.to_owned(), request_counter, false).await?;
82 update_community_mods(&group, &community, context, request_counter).await?;
84 // only fetch outbox for new communities, otherwise this can create an infinite loop
85 if old_community.is_none() {
86 let outbox = group.inner.outbox()?.context(location_info!())?;
87 fetch_community_outbox(context, outbox, &community, request_counter).await?
93 async fn update_community_mods(
95 community: &Community,
96 context: &LemmyContext,
97 request_counter: &mut i32,
98 ) -> Result<(), LemmyError> {
99 let new_moderators = fetch_community_mods(context, group, request_counter).await?;
100 let community_id = community.id;
101 let current_moderators = blocking(context.pool(), move |conn| {
102 CommunityModeratorView::for_community(conn, community_id)
105 // Remove old mods from database which arent in the moderators collection anymore
106 for mod_user in ¤t_moderators {
107 if !new_moderators.contains(&mod_user.moderator.actor_id.clone().into()) {
108 let community_moderator_form = CommunityModeratorForm {
109 community_id: mod_user.community.id,
110 person_id: mod_user.moderator.id,
112 blocking(context.pool(), move |conn| {
113 CommunityModerator::leave(conn, &community_moderator_form)
119 // Add new mods to database which have been added to moderators collection
120 for mod_uri in new_moderators {
121 let mod_user = get_or_fetch_and_upsert_person(&mod_uri, context, request_counter).await?;
123 if !current_moderators
126 .map(|c| c.moderator.actor_id.clone())
127 .any(|x| x == mod_user.actor_id)
129 let community_moderator_form = CommunityModeratorForm {
130 community_id: community.id,
131 person_id: mod_user.id,
133 blocking(context.pool(), move |conn| {
134 CommunityModerator::join(conn, &community_moderator_form)
143 async fn fetch_community_outbox(
144 context: &LemmyContext,
146 community: &Community,
147 recursion_counter: &mut i32,
148 ) -> Result<(), LemmyError> {
150 fetch_remote_object::<OrderedCollection>(context.client(), outbox, recursion_counter).await?;
151 let outbox_activities = outbox.items().context(location_info!())?.clone();
152 let mut outbox_activities = outbox_activities.many().context(location_info!())?;
153 if outbox_activities.len() > 20 {
154 outbox_activities = outbox_activities[0..20].to_vec();
157 for activity in outbox_activities {
158 todo!("{:?} {:?} {:?}", activity, community, recursion_counter);
159 //receive_announce(context, activity, community, recursion_counter).await?;
165 pub(crate) async fn fetch_community_mods(
166 context: &LemmyContext,
168 recursion_counter: &mut i32,
169 ) -> Result<Vec<Url>, LemmyError> {
170 if let Some(mods_url) = &group.ext_one.moderators {
172 fetch_remote_object::<OrderedCollection>(context.client(), mods_url, recursion_counter)
176 .map(|i| i.as_many())
178 .context(location_info!())?
180 .filter_map(|i| i.as_xsd_any_uri())
181 .map(|u| u.to_owned())