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https://github.com/LemmyNet/lemmy.git
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2402515fcc
* Dont allow posts to deleted / removed communities. Fixes #1827 * Fixing couldnt find community error. * Adding check in createorupdate post and comment. * make sure post wasn't deleted or removed. * Adding a post not deleted or removed check to creatorupdatecomment. * Using pub(crate)
157 lines
4.9 KiB
Rust
157 lines
4.9 KiB
Rust
use crate::{
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check_community_or_site_ban,
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check_is_apub_id_valid,
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fetcher::object_id::ObjectId,
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generate_moderators_url,
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};
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use anyhow::anyhow;
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use lemmy_api_common::blocking;
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use lemmy_apub_lib::{traits::ActivityFields, verify::verify_domains_match};
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use lemmy_db_schema::source::{community::Community, person::Person};
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use lemmy_db_views_actor::community_view::CommunityView;
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use lemmy_utils::{settings::structs::Settings, LemmyError};
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use lemmy_websocket::LemmyContext;
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use serde::{Deserialize, Serialize};
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use strum_macros::ToString;
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use url::{ParseError, Url};
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use uuid::Uuid;
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pub mod comment;
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pub mod community;
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pub mod deletion;
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pub mod following;
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pub mod post;
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pub mod private_message;
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pub mod undo_remove;
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pub mod voting;
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#[derive(Clone, Debug, ToString, Deserialize, Serialize)]
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pub enum CreateOrUpdateType {
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Create,
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Update,
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}
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/// Checks that the specified Url actually identifies a Person (by fetching it), and that the person
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/// doesn't have a site ban.
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async fn verify_person(
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person_id: &ObjectId<Person>,
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context: &LemmyContext,
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request_counter: &mut i32,
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) -> Result<(), LemmyError> {
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let person = person_id.dereference(context, request_counter).await?;
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if person.banned {
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return Err(anyhow!("Person {} is banned", person_id).into());
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}
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Ok(())
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}
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pub(crate) async fn extract_community(
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cc: &[Url],
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context: &LemmyContext,
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request_counter: &mut i32,
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) -> Result<Community, LemmyError> {
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let mut cc_iter = cc.iter();
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loop {
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if let Some(cid) = cc_iter.next() {
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let cid = ObjectId::new(cid.clone());
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if let Ok(c) = cid.dereference(context, request_counter).await {
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break Ok(c);
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}
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} else {
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return Err(anyhow!("No community found in cc").into());
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}
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}
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}
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/// Fetches the person and community to verify their type, then checks if person is banned from site
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/// or community.
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pub(crate) async fn verify_person_in_community(
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person_id: &ObjectId<Person>,
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community_id: &ObjectId<Community>,
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context: &LemmyContext,
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request_counter: &mut i32,
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) -> Result<(), LemmyError> {
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let community = community_id.dereference(context, request_counter).await?;
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let person = person_id.dereference(context, request_counter).await?;
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check_community_or_site_ban(&person, community.id, context.pool()).await
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}
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/// Simply check that the url actually refers to a valid group.
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async fn verify_community(
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community_id: &ObjectId<Community>,
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context: &LemmyContext,
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request_counter: &mut i32,
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) -> Result<(), LemmyError> {
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community_id.dereference(context, request_counter).await?;
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Ok(())
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}
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fn verify_activity(activity: &dyn ActivityFields, settings: &Settings) -> Result<(), LemmyError> {
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check_is_apub_id_valid(activity.actor(), false, settings)?;
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verify_domains_match(activity.id_unchecked(), activity.actor())?;
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Ok(())
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}
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/// Verify that the actor is a community mod. This check is only run if the community is local,
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/// because in case of remote communities, admins can also perform mod actions. As admin status
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/// is not federated, we cant verify their actions remotely.
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pub(crate) async fn verify_mod_action(
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actor_id: &ObjectId<Person>,
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community_id: ObjectId<Community>,
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context: &LemmyContext,
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request_counter: &mut i32,
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) -> Result<(), LemmyError> {
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let community = community_id.dereference_local(context).await?;
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if community.local {
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let actor = actor_id.dereference(context, request_counter).await?;
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// Note: this will also return true for admins in addition to mods, but as we dont know about
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// remote admins, it doesnt make any difference.
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let community_id = community.id;
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let actor_id = actor.id;
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let is_mod_or_admin = blocking(context.pool(), move |conn| {
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CommunityView::is_mod_or_admin(conn, actor_id, community_id)
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})
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.await?;
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if !is_mod_or_admin {
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return Err(anyhow!("Not a mod").into());
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}
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}
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Ok(())
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}
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/// For Add/Remove community moderator activities, check that the target field actually contains
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/// /c/community/moderators. Any different values are unsupported.
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fn verify_add_remove_moderator_target(
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target: &Url,
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community: &ObjectId<Community>,
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) -> Result<(), LemmyError> {
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if target != &generate_moderators_url(&community.clone().into())?.into_inner() {
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return Err(anyhow!("Unkown target url").into());
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}
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Ok(())
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}
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pub(crate) fn check_community_deleted_or_removed(community: &Community) -> Result<(), LemmyError> {
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if community.deleted || community.removed {
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Err(anyhow!("New post or comment cannot be created in deleted or removed community").into())
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} else {
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Ok(())
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}
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}
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/// Generate a unique ID for an activity, in the format:
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/// `http(s)://example.com/receive/create/202daf0a-1489-45df-8d2e-c8a3173fed36`
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fn generate_activity_id<T>(kind: T, protocol_and_hostname: &str) -> Result<Url, ParseError>
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where
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T: ToString,
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{
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let id = format!(
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"{}/activities/{}/{}",
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protocol_and_hostname,
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kind.to_string().to_lowercase(),
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Uuid::new_v4()
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);
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Url::parse(&id)
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}
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