Hexbear is the engine that powers Chapochat. It is a customization of the Lemmy project.
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

403 lines
13 KiB

use crate::{
apub::{
check_is_apub_id_valid, ActorType, FromApub, GroupExt, PageExt, PersonExt,
APUB_JSON_CONTENT_TYPE,
},
blocking,
request::{retry, RecvError},
LemmyContext,
};
use activitystreams::{base::BaseExt, collection::OrderedCollection, object::Note, prelude::*};
use anyhow::{anyhow, Context};
use chrono::NaiveDateTime;
use diesel::result::Error::NotFound;
use lemmy_api_structs::site::SearchResponse;
use lemmy_db::{
comment::{Comment, CommentForm},
comment_view::CommentView,
community::{Community, CommunityForm, CommunityModerator, CommunityModeratorForm},
community_view::CommunityView,
naive_now,
post::{Post, PostForm},
post_view::PostView,
user::{UserForm, User_},
user_view::UserViewSafe,
Crud, Joinable, SearchType,
};
use lemmy_utils::{get_apub_protocol_string, location_info, LemmyError};
use log::debug;
use reqwest::Client;
use serde::Deserialize;
use std::{fmt::Debug, time::Duration};
use url::Url;
static ACTOR_REFETCH_INTERVAL_SECONDS: i64 = 24 * 60 * 60;
static ACTOR_REFETCH_INTERVAL_SECONDS_DEBUG: i64 = 10;
/// Fetch any type of ActivityPub object, handling things like HTTP headers, deserialisation,
/// timeouts etc.
pub async fn fetch_remote_object<Response>(
client: &Client,
url: &Url,
) -> Result<Response, LemmyError>
where
Response: for<'de> Deserialize<'de>,
{
check_is_apub_id_valid(&url)?;
let timeout = Duration::from_secs(60);
// speed up tests
// before: 305s
// after: 240s
let json = retry(|| {
client
.get(url.as_str())
.header("Accept", APUB_JSON_CONTENT_TYPE)
.timeout(timeout)
.send()
})
.await?
.json()
.await
.map_err(|e| {
debug!("Receive error, {}", e);
RecvError(e.to_string())
})?;
Ok(json)
}
/// The types of ActivityPub objects that can be fetched directly by searching for their ID.
#[derive(serde::Deserialize, Debug)]
#[serde(untagged)]
pub enum SearchAcceptedObjects {
Person(Box<PersonExt>),
Group(Box<GroupExt>),
Page(Box<PageExt>),
Comment(Box<Note>),
}
/// Attempt to parse the query as URL, and fetch an ActivityPub object from it.
///
/// Some working examples for use with the docker/federation/ setup:
/// http://lemmy_alpha:8540/c/main, or [email protected]_alpha:8540
/// http://lemmy_alpha:8540/u/lemmy_alpha, or @[email protected]_alpha:8540
/// http://lemmy_alpha:8540/post/3
/// http://lemmy_alpha:8540/comment/2
pub async fn search_by_apub_id(
query: &str,
context: &LemmyContext,
) -> Result<SearchResponse, LemmyError> {
// Parse the shorthand query url
let query_url = if query.contains('@') {
debug!("{}", query);
let split = query.split('@').collect::<Vec<&str>>();
// User type will look like ['', username, instance]
// Community will look like [!community, instance]
let (name, instance) = if split.len() == 3 {
(format!("/u/{}", split[1]), split[2])
} else if split.len() == 2 {
if split[0].contains('!') {
let split2 = split[0].split('!').collect::<Vec<&str>>();
(format!("/c/{}", split2[1]), split[1])
} else {
return Err(anyhow!("Invalid search query: {}", query).into());
}
} else {
return Err(anyhow!("Invalid search query: {}", query).into());
};
let url = format!("{}://{}{}", get_apub_protocol_string(), instance, name);
Url::parse(&url)?
} else {
Url::parse(&query)?
};
let mut response = SearchResponse {
type_: SearchType::All.to_string(),
comments: vec![],
posts: vec![],
communities: vec![],
users: vec![],
};
let domain = query_url.domain().context("url has no domain")?;
let response =
match fetch_remote_object::<SearchAcceptedObjects>(context.client(), &query_url).await? {
SearchAcceptedObjects::Person(p) => {
let user_uri = p.inner.id(domain)?.context("person has no id")?;
let user = get_or_fetch_and_upsert_user(&user_uri, context).await?;
response.users = vec![
blocking(context.pool(), move |conn| {
UserViewSafe::read(conn, user.id)
})
.await??,
];
response
}
SearchAcceptedObjects::Group(g) => {
let community_uri = g.inner.id(domain)?.context("group has no id")?;
let community = get_or_fetch_and_upsert_community(community_uri, context).await?;
response.communities = vec![
blocking(context.pool(), move |conn| {
CommunityView::read(conn, community.id, None)
})
.await??,
];
response
}
SearchAcceptedObjects::Page(p) => {
let post_form = PostForm::from_apub(&p, context, Some(query_url)).await?;
let p = blocking(context.pool(), move |conn| Post::upsert(conn, &post_form)).await??;
response.posts =
vec![blocking(context.pool(), move |conn| PostView::read(conn, p.id, None)).await??];
response
}
SearchAcceptedObjects::Comment(c) => {
let comment_form = CommentForm::from_apub(&c, context, Some(query_url)).await?;
let c = blocking(context.pool(), move |conn| {
Comment::upsert(conn, &comment_form)
})
.await??;
response.comments = vec![
blocking(context.pool(), move |conn| {
CommentView::read(conn, c.id, None)
})
.await??,
];
response
}
};
Ok(response)
}
pub async fn get_or_fetch_and_upsert_actor(
apub_id: &Url,
context: &LemmyContext,
) -> Result<Box<dyn ActorType>, LemmyError> {
let user = get_or_fetch_and_upsert_user(apub_id, context).await;
let actor: Box<dyn ActorType> = match user {
Ok(u) => Box::new(u),
Err(_) => Box::new(get_or_fetch_and_upsert_community(apub_id, context).await?),
};
Ok(actor)
}
/// Check if a remote user exists, create if not found, if its too old update it.Fetch a user, insert/update it in the database and return the user.
pub async fn get_or_fetch_and_upsert_user(
apub_id: &Url,
context: &LemmyContext,
) -> Result<User_, LemmyError> {
let apub_id_owned = apub_id.to_owned();
let user = blocking(context.pool(), move |conn| {
User_::read_from_actor_id(conn, apub_id_owned.as_ref())
})
.await?;
match user {
// If its older than a day, re-fetch it
Ok(u) if !u.local && should_refetch_actor(u.last_refreshed_at) => {
debug!("Fetching and updating from remote user: {}", apub_id);
let person = fetch_remote_object::<PersonExt>(context.client(), apub_id).await?;
let mut uf = UserForm::from_apub(&person, context, Some(apub_id.to_owned())).await?;
uf.last_refreshed_at = Some(naive_now());
let user = blocking(context.pool(), move |conn| User_::update(conn, u.id, &uf)).await??;
Ok(user)
}
Ok(u) => Ok(u),
Err(NotFound {}) => {
debug!("Fetching and creating remote user: {}", apub_id);
let person = fetch_remote_object::<PersonExt>(context.client(), apub_id).await?;
let uf = UserForm::from_apub(&person, context, Some(apub_id.to_owned())).await?;
let user = blocking(context.pool(), move |conn| User_::upsert(conn, &uf)).await??;
Ok(user)
}
Err(e) => Err(e.into()),
}
}
/// Determines when a remote actor should be refetched from its instance. In release builds, this is
/// ACTOR_REFETCH_INTERVAL_SECONDS after the last refetch, in debug builds always.
///
/// TODO it won't pick up new avatars, summaries etc until a day after.
/// Actors need an "update" activity pushed to other servers to fix this.
fn should_refetch_actor(last_refreshed: NaiveDateTime) -> bool {
let update_interval = if cfg!(debug_assertions) {
// avoid infinite loop when fetching community outbox
chrono::Duration::seconds(ACTOR_REFETCH_INTERVAL_SECONDS_DEBUG)
} else {
chrono::Duration::seconds(ACTOR_REFETCH_INTERVAL_SECONDS)
};
last_refreshed.lt(&(naive_now() - update_interval))
}
/// Check if a remote community exists, create if not found, if its too old update it.Fetch a community, insert/update it in the database and return the community.
pub async fn get_or_fetch_and_upsert_community(
apub_id: &Url,
context: &LemmyContext,
) -> Result<Community, LemmyError> {
let apub_id_owned = apub_id.to_owned();
let community = blocking(context.pool(), move |conn| {
Community::read_from_actor_id(conn, apub_id_owned.as_str())
})
.await?;
match community {
Ok(c) if !c.local && should_refetch_actor(c.last_refreshed_at) => {
debug!("Fetching and updating from remote community: {}", apub_id);
fetch_remote_community(apub_id, context, Some(c.id)).await
}
Ok(c) => Ok(c),
Err(NotFound {}) => {
debug!("Fetching and creating remote community: {}", apub_id);
fetch_remote_community(apub_id, context, None).await
}
Err(e) => Err(e.into()),
}
}
async fn fetch_remote_community(
apub_id: &Url,
context: &LemmyContext,
community_id: Option<i32>,
) -> Result<Community, LemmyError> {
let group = fetch_remote_object::<GroupExt>(context.client(), apub_id).await?;
let cf = CommunityForm::from_apub(&group, context, Some(apub_id.to_owned())).await?;
let community = blocking(context.pool(), move |conn| Community::upsert(conn, &cf)).await??;
// Also add the community moderators too
let attributed_to = group.inner.attributed_to().context(location_info!())?;
let creator_and_moderator_uris: Vec<&Url> = attributed_to
.as_many()
.context(location_info!())?
.iter()
.map(|a| a.as_xsd_any_uri().context(""))
.collect::<Result<Vec<&Url>, anyhow::Error>>()?;
let mut creator_and_moderators = Vec::new();
for uri in creator_and_moderator_uris {
let c_or_m = get_or_fetch_and_upsert_user(uri, context).await?;
creator_and_moderators.push(c_or_m);
}
// TODO: need to make this work to update mods of existing communities
if community_id.is_none() {
let community_id = community.id;
blocking(context.pool(), move |conn| {
for mod_ in creator_and_moderators {
let community_moderator_form = CommunityModeratorForm {
community_id,
user_id: mod_.id,
};
CommunityModerator::join(conn, &community_moderator_form)?;
}
Ok(()) as Result<(), LemmyError>
})
.await??;
}
// fetch outbox (maybe make this conditional)
let outbox =
fetch_remote_object::<OrderedCollection>(context.client(), &community.get_outbox_url()?)
.await?;
let outbox_items = outbox.items().context(location_info!())?.clone();
let mut outbox_items = outbox_items.many().context(location_info!())?;
if outbox_items.len() > 20 {
outbox_items = outbox_items[0..20].to_vec();
}
for o in outbox_items {
let page = PageExt::from_any_base(o)?.context(location_info!())?;
let post = PostForm::from_apub(&page, context, None).await?;
let post_ap_id = post.ap_id.as_ref().context(location_info!())?.clone();
// Check whether the post already exists in the local db
let existing = blocking(context.pool(), move |conn| {
Post::read_from_apub_id(conn, &post_ap_id)
})
.await?;
match existing {
Ok(e) => blocking(context.pool(), move |conn| Post::update(conn, e.id, &post)).await??,
Err(_) => blocking(context.pool(), move |conn| Post::upsert(conn, &post)).await??,
};
// TODO: we need to send a websocket update here
}
Ok(community)
}
pub async fn get_or_fetch_and_insert_post(
post_ap_id: &Url,
context: &LemmyContext,
) -> Result<Post, LemmyError> {
let post_ap_id_owned = post_ap_id.to_owned();
let post = blocking(context.pool(), move |conn| {
Post::read_from_apub_id(conn, post_ap_id_owned.as_str())
})
.await?;
match post {
Ok(p) => Ok(p),
Err(NotFound {}) => {
debug!("Fetching and creating remote post: {}", post_ap_id);
let post = fetch_remote_object::<PageExt>(context.client(), post_ap_id).await?;
let post_form = PostForm::from_apub(&post, context, Some(post_ap_id.to_owned())).await?;
let post = blocking(context.pool(), move |conn| Post::upsert(conn, &post_form)).await??;
Ok(post)
}
Err(e) => Err(e.into()),
}
}
pub async fn get_or_fetch_and_insert_comment(
comment_ap_id: &Url,
context: &LemmyContext,
) -> Result<Comment, LemmyError> {
let comment_ap_id_owned = comment_ap_id.to_owned();
let comment = blocking(context.pool(), move |conn| {
Comment::read_from_apub_id(conn, comment_ap_id_owned.as_str())
})
.await?;
match comment {
Ok(p) => Ok(p),
Err(NotFound {}) => {
debug!(
"Fetching and creating remote comment and its parents: {}",
comment_ap_id
);
let comment = fetch_remote_object::<Note>(context.client(), comment_ap_id).await?;
let comment_form =
CommentForm::from_apub(&comment, context, Some(comment_ap_id.to_owned())).await?;
let comment = blocking(context.pool(), move |conn| {
Comment::upsert(conn, &comment_form)
})
.await??;
Ok(comment)
}
Err(e) => Err(e.into()),
}
}