117 lines
3.8 KiB
Rust
117 lines
3.8 KiB
Rust
use serde::Deserialize;
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use serde_json::Value;
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use tokio_postgres::GenericClient;
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use crate::activitypub::{
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identifiers::parse_local_actor_id,
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receiver::find_object_id,
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vocabulary::{ANNOUNCE, FOLLOW, LIKE},
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};
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use crate::config::Config;
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use crate::database::DatabaseError;
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use crate::errors::ValidationError;
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use crate::models::{
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posts::queries::{
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delete_post,
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get_post_by_remote_object_id,
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},
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profiles::queries::{
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get_profile_by_acct,
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get_profile_by_remote_actor_id,
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},
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reactions::queries::{
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delete_reaction,
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get_reaction_by_remote_activity_id,
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},
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relationships::queries::unfollow,
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};
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use super::HandlerResult;
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#[derive(Deserialize)]
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struct Undo {
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actor: String,
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object: Value,
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}
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async fn handle_undo_follow(
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config: &Config,
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db_client: &mut impl GenericClient,
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activity: Undo,
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) -> HandlerResult {
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let source_profile = get_profile_by_remote_actor_id(
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db_client,
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&activity.actor,
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).await?;
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let target_actor_id = find_object_id(&activity.object["object"])?;
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let target_username = parse_local_actor_id(
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&config.instance_url(),
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&target_actor_id,
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)?;
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// acct equals username if profile is local
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let target_profile = get_profile_by_acct(db_client, &target_username).await?;
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match unfollow(db_client, &source_profile.id, &target_profile.id).await {
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Ok(_) => (),
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// Ignore Undo if relationship doesn't exist
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Err(DatabaseError::NotFound(_)) => return Ok(None),
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Err(other_error) => return Err(other_error.into()),
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};
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Ok(Some(FOLLOW))
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}
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pub async fn handle_undo(
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config: &Config,
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db_client: &mut impl GenericClient,
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activity: Value,
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) -> HandlerResult {
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let activity: Undo = serde_json::from_value(activity)
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.map_err(|_| ValidationError("unexpected activity structure"))?;
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if let Some(FOLLOW) = activity.object["type"].as_str() {
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// Object type is currently required for processing Undo(Follow)
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// because activity IDs of remote follow requests are not stored.
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return handle_undo_follow(config, db_client, activity).await
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};
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let actor_profile = get_profile_by_remote_actor_id(
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db_client,
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&activity.actor,
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).await?;
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let object_id = find_object_id(&activity.object)?;
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match get_reaction_by_remote_activity_id(db_client, &object_id).await {
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Ok(reaction) => {
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// Undo(Like)
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if reaction.author_id != actor_profile.id {
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return Err(ValidationError("actor is not an author").into());
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};
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delete_reaction(
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db_client,
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&reaction.author_id,
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&reaction.post_id,
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).await?;
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Ok(Some(LIKE))
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},
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Err(DatabaseError::NotFound(_)) => {
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// Undo(Announce)
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let post = match get_post_by_remote_object_id(
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db_client,
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&object_id,
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).await {
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Ok(post) => post,
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// Ignore undo if neither reaction nor repost is found
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Err(DatabaseError::NotFound(_)) => return Ok(None),
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Err(other_error) => return Err(other_error.into()),
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};
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if post.author.id != actor_profile.id {
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return Err(ValidationError("actor is not an author").into());
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};
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match post.repost_of_id {
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// Ignore returned data because reposts don't have attached files
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Some(_) => delete_post(db_client, &post.id).await?,
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// Can't undo regular post
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None => return Err(ValidationError("object is not a repost").into()),
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};
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Ok(Some(ANNOUNCE))
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},
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Err(other_error) => Err(other_error.into()),
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}
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}
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