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[lemmy.git] / crates / apub / src / objects / community.rs
1 use crate::{
2   check_apub_id_valid_with_strictness,
3   fetch_local_site_data,
4   objects::instance::fetch_instance_actor_for_object,
5   protocol::{
6     objects::{group::Group, Endpoints, LanguageTag},
7     ImageObject,
8     Source,
9   },
10 };
11 use activitypub_federation::{
12   config::Data,
13   kinds::actor::GroupType,
14   traits::{Actor, Object},
15 };
16 use chrono::NaiveDateTime;
17 use itertools::Itertools;
18 use lemmy_api_common::{
19   context::LemmyContext,
20   utils::{generate_featured_url, generate_moderators_url, generate_outbox_url},
21 };
22 use lemmy_db_schema::{
23   source::{
24     actor_language::CommunityLanguage,
25     community::{Community, CommunityUpdateForm},
26   },
27   traits::{ApubActor, Crud},
28 };
29 use lemmy_db_views_actor::structs::CommunityFollowerView;
30 use lemmy_utils::{
31   error::LemmyError,
32   utils::{markdown::markdown_to_html, time::convert_datetime},
33 };
34 use std::ops::Deref;
35 use tracing::debug;
36 use url::Url;
37
38 #[derive(Clone, Debug)]
39 pub struct ApubCommunity(Community);
40
41 impl Deref for ApubCommunity {
42   type Target = Community;
43   fn deref(&self) -> &Self::Target {
44     &self.0
45   }
46 }
47
48 impl From<Community> for ApubCommunity {
49   fn from(c: Community) -> Self {
50     ApubCommunity(c)
51   }
52 }
53
54 #[async_trait::async_trait]
55 impl Object for ApubCommunity {
56   type DataType = LemmyContext;
57   type Kind = Group;
58   type Error = LemmyError;
59
60   fn last_refreshed_at(&self) -> Option<NaiveDateTime> {
61     Some(self.last_refreshed_at)
62   }
63
64   #[tracing::instrument(skip_all)]
65   async fn read_from_id(
66     object_id: Url,
67     context: &Data<Self::DataType>,
68   ) -> Result<Option<Self>, LemmyError> {
69     Ok(
70       Community::read_from_apub_id(context.pool(), &object_id.into())
71         .await?
72         .map(Into::into),
73     )
74   }
75
76   #[tracing::instrument(skip_all)]
77   async fn delete(self, context: &Data<Self::DataType>) -> Result<(), LemmyError> {
78     let form = CommunityUpdateForm::builder().deleted(Some(true)).build();
79     Community::update(context.pool(), self.id, &form).await?;
80     Ok(())
81   }
82
83   #[tracing::instrument(skip_all)]
84   async fn into_json(self, data: &Data<Self::DataType>) -> Result<Group, LemmyError> {
85     let community_id = self.id;
86     let langs = CommunityLanguage::read(data.pool(), community_id).await?;
87     let language = LanguageTag::new_multiple(langs, data.pool()).await?;
88
89     let group = Group {
90       kind: GroupType::Group,
91       id: self.id().into(),
92       preferred_username: self.name.clone(),
93       name: Some(self.title.clone()),
94       summary: self.description.as_ref().map(|b| markdown_to_html(b)),
95       source: self.description.clone().map(Source::new),
96       icon: self.icon.clone().map(ImageObject::new),
97       image: self.banner.clone().map(ImageObject::new),
98       sensitive: Some(self.nsfw),
99       featured: Some(generate_featured_url(&self.actor_id)?.into()),
100       inbox: self.inbox_url.clone().into(),
101       outbox: generate_outbox_url(&self.actor_id)?.into(),
102       followers: self.followers_url.clone().into(),
103       endpoints: self.shared_inbox_url.clone().map(|s| Endpoints {
104         shared_inbox: s.into(),
105       }),
106       public_key: self.public_key(),
107       language,
108       published: Some(convert_datetime(self.published)),
109       updated: self.updated.map(convert_datetime),
110       posting_restricted_to_mods: Some(self.posting_restricted_to_mods),
111       attributed_to: Some(generate_moderators_url(&self.actor_id)?.into()),
112     };
113     Ok(group)
114   }
115
116   #[tracing::instrument(skip_all)]
117   async fn verify(
118     group: &Group,
119     expected_domain: &Url,
120     context: &Data<Self::DataType>,
121   ) -> Result<(), LemmyError> {
122     group.verify(expected_domain, context).await
123   }
124
125   /// Converts a `Group` to `Community`, inserts it into the database and updates moderators.
126   #[tracing::instrument(skip_all)]
127   async fn from_json(
128     group: Group,
129     context: &Data<Self::DataType>,
130   ) -> Result<ApubCommunity, LemmyError> {
131     let instance_id = fetch_instance_actor_for_object(&group.id, context).await?;
132
133     let form = Group::into_insert_form(group.clone(), instance_id);
134     let languages = LanguageTag::to_language_id_multiple(group.language, context.pool()).await?;
135
136     let community = Community::create(context.pool(), &form).await?;
137     CommunityLanguage::update(context.pool(), languages, community.id).await?;
138
139     let community: ApubCommunity = community.into();
140
141     // Fetching mods and outbox is not necessary for Lemmy to work, so ignore errors. Besides,
142     // we need to ignore these errors so that tests can work entirely offline.
143     group
144       .outbox
145       .dereference(&community, context)
146       .await
147       .map_err(|e| debug!("{}", e))
148       .ok();
149
150     if let Some(moderators) = group.attributed_to {
151       moderators
152         .dereference(&community, context)
153         .await
154         .map_err(|e| debug!("{}", e))
155         .ok();
156     }
157
158     Ok(community)
159   }
160 }
161
162 impl Actor for ApubCommunity {
163   fn id(&self) -> Url {
164     self.actor_id.inner().clone()
165   }
166
167   fn public_key_pem(&self) -> &str {
168     &self.public_key
169   }
170
171   fn private_key_pem(&self) -> Option<String> {
172     self.private_key.clone()
173   }
174
175   fn inbox(&self) -> Url {
176     self.inbox_url.clone().into()
177   }
178
179   fn shared_inbox(&self) -> Option<Url> {
180     self.shared_inbox_url.clone().map(Into::into)
181   }
182 }
183
184 impl ApubCommunity {
185   /// For a given community, returns the inboxes of all followers.
186   #[tracing::instrument(skip_all)]
187   pub(crate) async fn get_follower_inboxes(
188     &self,
189     context: &LemmyContext,
190   ) -> Result<Vec<Url>, LemmyError> {
191     let id = self.id;
192
193     let local_site_data = fetch_local_site_data(context.pool()).await?;
194     let follows = CommunityFollowerView::for_community(context.pool(), id).await?;
195     let inboxes: Vec<Url> = follows
196       .into_iter()
197       .filter(|f| !f.follower.local)
198       .map(|f| {
199         f.follower
200           .shared_inbox_url
201           .unwrap_or(f.follower.inbox_url)
202           .into()
203       })
204       .unique()
205       .filter(|inbox: &Url| inbox.host_str() != Some(&context.settings().hostname))
206       // Don't send to blocked instances
207       .filter(|inbox| {
208         check_apub_id_valid_with_strictness(inbox, false, &local_site_data, context.settings())
209           .is_ok()
210       })
211       .collect();
212
213     Ok(inboxes)
214   }
215 }
216
217 #[cfg(test)]
218 pub(crate) mod tests {
219   use super::*;
220   use crate::{
221     objects::{instance::tests::parse_lemmy_instance, tests::init_context},
222     protocol::tests::file_to_json_object,
223   };
224   use activitypub_federation::fetch::collection_id::CollectionId;
225   use lemmy_db_schema::{source::site::Site, traits::Crud};
226   use serial_test::serial;
227
228   pub(crate) async fn parse_lemmy_community(context: &Data<LemmyContext>) -> ApubCommunity {
229     // use separate counter so this doesnt affect tests
230     let context2 = context.reset_request_count();
231     let mut json: Group = file_to_json_object("assets/lemmy/objects/group.json").unwrap();
232     // change these links so they dont fetch over the network
233     json.attributed_to = None;
234     json.outbox =
235       CollectionId::parse("https://enterprise.lemmy.ml/c/tenforward/not_outbox").unwrap();
236
237     let url = Url::parse("https://enterprise.lemmy.ml/c/tenforward").unwrap();
238     ApubCommunity::verify(&json, &url, &context2).await.unwrap();
239     let community = ApubCommunity::from_json(json, &context2).await.unwrap();
240     // this makes one requests to the (intentionally broken) outbox collection
241     assert_eq!(context2.request_count(), 1);
242     community
243   }
244
245   #[tokio::test]
246   #[serial]
247   async fn test_parse_lemmy_community() {
248     let context = init_context().await;
249     let site = parse_lemmy_instance(&context).await;
250     let community = parse_lemmy_community(&context).await;
251
252     assert_eq!(community.title, "Ten Forward");
253     assert!(!community.local);
254     assert_eq!(community.description.as_ref().unwrap().len(), 132);
255
256     Community::delete(context.pool(), community.id)
257       .await
258       .unwrap();
259     Site::delete(context.pool(), site.id).await.unwrap();
260   }
261 }