lemmy/crates/apub/src/mentions.rs
Dessalines d075acce43
Make all single-fetch database calls return an Option. (#4617)
- Diesel ordinarily throws an error when no results are returned for a
  single fetch, which is a bit confusing. This PR ensures that the
  missing value cases are all caught, and wrapped with new LemmyErrors,
  rather than diesel errors.
- Fixes #4601
2024-04-16 14:48:15 +02:00

116 lines
3.6 KiB
Rust

use crate::objects::{comment::ApubComment, community::ApubCommunity, person::ApubPerson};
use activitypub_federation::{
config::Data,
fetch::{object_id::ObjectId, webfinger::webfinger_resolve_actor},
kinds::link::MentionType,
traits::Actor,
};
use lemmy_api_common::context::LemmyContext;
use lemmy_db_schema::{
source::{comment::Comment, person::Person, post::Post},
traits::Crud,
utils::DbPool,
};
use lemmy_utils::{error::LemmyResult, utils::mention::scrape_text_for_mentions, LemmyErrorType};
use serde::{Deserialize, Serialize};
use serde_json::Value;
use url::Url;
#[derive(Clone, Debug, Deserialize, Serialize)]
#[serde(untagged)]
pub enum MentionOrValue {
Mention(Mention),
Value(Value),
}
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Mention {
pub href: Url,
name: Option<String>,
#[serde(rename = "type")]
pub kind: MentionType,
}
pub struct MentionsAndAddresses {
pub ccs: Vec<Url>,
pub tags: Vec<MentionOrValue>,
}
/// This takes a comment, and builds a list of to_addresses, inboxes,
/// and mention tags, so they know where to be sent to.
/// Addresses are the persons / addresses that go in the cc field.
#[tracing::instrument(skip(comment, community_id, context))]
pub async fn collect_non_local_mentions(
comment: &ApubComment,
community_id: ObjectId<ApubCommunity>,
context: &Data<LemmyContext>,
) -> LemmyResult<MentionsAndAddresses> {
let parent_creator = get_comment_parent_creator(&mut context.pool(), comment).await?;
let mut addressed_ccs: Vec<Url> = vec![community_id.into(), parent_creator.id()];
// Add the mention tag
let parent_creator_tag = Mention {
href: parent_creator.actor_id.clone().into(),
name: Some(format!(
"@{}@{}",
&parent_creator.name,
&parent_creator.id().domain().expect("has domain")
)),
kind: MentionType::Mention,
};
let mut tags = vec![parent_creator_tag];
// Get the person IDs for any mentions
let mentions = scrape_text_for_mentions(&comment.content)
.into_iter()
// Filter only the non-local ones
.filter(|m| !m.is_local(&context.settings().hostname));
for mention in mentions {
let identifier = format!("{}@{}", mention.name, mention.domain);
let person = webfinger_resolve_actor::<LemmyContext, ApubPerson>(&identifier, context).await;
if let Ok(person) = person {
addressed_ccs.push(person.actor_id.to_string().parse()?);
let mention_tag = Mention {
href: person.id(),
name: Some(mention.full_name()),
kind: MentionType::Mention,
};
tags.push(mention_tag);
}
}
let tags = tags.into_iter().map(MentionOrValue::Mention).collect();
Ok(MentionsAndAddresses {
ccs: addressed_ccs,
tags,
})
}
/// Returns the apub ID of the person this comment is responding to. Meaning, in case this is a
/// top-level comment, the creator of the post, otherwise the creator of the parent comment.
#[tracing::instrument(skip(pool, comment))]
async fn get_comment_parent_creator(
pool: &mut DbPool<'_>,
comment: &Comment,
) -> LemmyResult<ApubPerson> {
let parent_creator_id = if let Some(parent_comment_id) = comment.parent_comment_id() {
let parent_comment = Comment::read(pool, parent_comment_id)
.await?
.ok_or(LemmyErrorType::CouldntFindComment)?;
parent_comment.creator_id
} else {
let parent_post_id = comment.post_id;
let parent_post = Post::read(pool, parent_post_id)
.await?
.ok_or(LemmyErrorType::CouldntFindPost)?;
parent_post.creator_id
};
Ok(
Person::read(pool, parent_creator_id)
.await?
.ok_or(LemmyErrorType::CouldntFindPerson)?
.into(),
)
}