2 check_community_or_site_ban,
3 check_is_apub_id_valid,
4 fetcher::{community::get_or_fetch_and_upsert_community, person::get_or_fetch_and_upsert_person},
5 generate_moderators_url,
8 use lemmy_api_common::blocking;
9 use lemmy_apub_lib::{verify_domains_match, ActivityCommonFields};
10 use lemmy_db_queries::ApubObject;
11 use lemmy_db_schema::{
12 source::{community::Community, person::Person},
15 use lemmy_db_views_actor::community_view::CommunityView;
16 use lemmy_utils::{settings::structs::Settings, LemmyError};
17 use lemmy_websocket::LemmyContext;
18 use url::{ParseError, Url};
26 pub mod private_message;
31 /// Checks that the specified Url actually identifies a Person (by fetching it), and that the person
32 /// doesn't have a site ban.
33 async fn verify_person(
35 context: &LemmyContext,
36 request_counter: &mut i32,
37 ) -> Result<(), LemmyError> {
38 let person = get_or_fetch_and_upsert_person(person_id, context, request_counter).await?;
40 return Err(anyhow!("Person {} is banned", person_id).into());
45 pub(crate) async fn extract_community(
47 context: &LemmyContext,
48 request_counter: &mut i32,
49 ) -> Result<Community, LemmyError> {
50 let mut cc_iter = cc.iter();
52 if let Some(cid) = cc_iter.next() {
53 if let Ok(c) = get_or_fetch_and_upsert_community(cid, context, request_counter).await {
57 return Err(anyhow!("No community found in cc").into());
62 /// Fetches the person and community to verify their type, then checks if person is banned from site
64 async fn verify_person_in_community(
67 context: &LemmyContext,
68 request_counter: &mut i32,
69 ) -> Result<(), LemmyError> {
70 let community = get_or_fetch_and_upsert_community(community_id, context, request_counter).await?;
71 let person = get_or_fetch_and_upsert_person(person_id, context, request_counter).await?;
72 check_community_or_site_ban(&person, community.id, context.pool()).await
75 /// Simply check that the url actually refers to a valid group.
76 async fn verify_community(
78 context: &LemmyContext,
79 request_counter: &mut i32,
80 ) -> Result<(), LemmyError> {
81 get_or_fetch_and_upsert_community(community_id, context, request_counter).await?;
85 fn verify_activity(common: &ActivityCommonFields) -> Result<(), LemmyError> {
86 check_is_apub_id_valid(&common.actor, false)?;
87 verify_domains_match(common.id_unchecked(), &common.actor)?;
91 /// Verify that the actor is a community mod. This check is only run if the community is local,
92 /// because in case of remote communities, admins can also perform mod actions. As admin status
93 /// is not federated, we cant verify their actions remotely.
94 pub(crate) async fn verify_mod_action(
97 context: &LemmyContext,
98 ) -> Result<(), LemmyError> {
99 let community = blocking(context.pool(), move |conn| {
100 Community::read_from_apub_id(conn, &community.into())
105 let actor_id: DbUrl = actor_id.clone().into();
106 let actor = blocking(context.pool(), move |conn| {
107 Person::read_from_apub_id(conn, &actor_id)
111 // Note: this will also return true for admins in addition to mods, but as we dont know about
112 // remote admins, it doesnt make any difference.
113 let community_id = community.id;
114 let actor_id = actor.id;
115 let is_mod_or_admin = blocking(context.pool(), move |conn| {
116 CommunityView::is_mod_or_admin(conn, actor_id, community_id)
119 if !is_mod_or_admin {
120 return Err(anyhow!("Not a mod").into());
126 /// For Add/Remove community moderator activities, check that the target field actually contains
127 /// /c/community/moderators. Any different values are unsupported.
128 fn verify_add_remove_moderator_target(target: &Url, community: Url) -> Result<(), LemmyError> {
129 if target != &generate_moderators_url(&community.into())?.into_inner() {
130 return Err(anyhow!("Unkown target url").into());
135 /// Generate a unique ID for an activity, in the format:
136 /// `http(s)://example.com/receive/create/202daf0a-1489-45df-8d2e-c8a3173fed36`
137 fn generate_activity_id<T>(kind: T) -> Result<Url, ParseError>
142 "{}/activities/{}/{}",
143 Settings::get().get_protocol_and_hostname(),
144 kind.to_string().to_lowercase(),