lemmy/crates/apub/src/lib.rs

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use crate::fetcher::post_or_comment::PostOrComment;
use anyhow::{anyhow, Context};
use lemmy_api_common::blocking;
use lemmy_db_schema::{newtypes::DbUrl, source::activity::Activity, DbPool};
use lemmy_utils::{location_info, settings::structs::Settings, LemmyError};
use std::net::IpAddr;
use url::{ParseError, Url};
pub mod activities;
pub(crate) mod activity_lists;
pub(crate) mod collections;
mod context;
pub mod fetcher;
pub mod http;
pub(crate) mod mentions;
pub mod migrations;
pub mod objects;
pub mod protocol;
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/// Checks if the ID is allowed for sending or receiving.
///
/// In particular, it checks for:
/// - federation being enabled (if its disabled, only local URLs are allowed)
/// - the correct scheme (either http or https)
/// - URL being in the allowlist (if it is active)
/// - URL not being in the blocklist (if it is active)
///
/// `use_strict_allowlist` should be true only when parsing a remote community, or when parsing a
/// post/comment in a local community.
pub(crate) fn check_is_apub_id_valid(
apub_id: &Url,
use_strict_allowlist: bool,
settings: &Settings,
) -> Result<(), LemmyError> {
let domain = apub_id.domain().context(location_info!())?.to_string();
let local_instance = settings.get_hostname_without_port()?;
if !settings.federation.enabled {
return if domain == local_instance {
Ok(())
} else {
Err(
anyhow!(
"Trying to connect with {}, but federation is disabled",
domain
)
.into(),
)
};
}
let host = apub_id.host_str().context(location_info!())?;
let host_as_ip = host.parse::<IpAddr>();
if host == "localhost" || host_as_ip.is_ok() {
return Err(anyhow!("invalid hostname {}: {}", host, apub_id).into());
}
if apub_id.scheme() != settings.get_protocol_string() {
return Err(anyhow!("invalid apub id scheme {}: {}", apub_id.scheme(), apub_id).into());
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}
// TODO: might be good to put the part above in one method, and below in another
// (which only gets called in apub::objects)
// -> no that doesnt make sense, we still need the code below for blocklist and strict allowlist
if let Some(blocked) = settings.to_owned().federation.blocked_instances {
if blocked.contains(&domain) {
return Err(anyhow!("{} is in federation blocklist", domain).into());
}
}
if let Some(mut allowed) = settings.to_owned().federation.allowed_instances {
// Only check allowlist if this is a community, or strict allowlist is enabled.
let strict_allowlist = settings.to_owned().federation.strict_allowlist;
if use_strict_allowlist || strict_allowlist {
// need to allow this explicitly because apub receive might contain objects from our local
// instance.
allowed.push(local_instance);
if !allowed.contains(&domain) {
return Err(anyhow!("{} not in federation allowlist", domain).into());
}
}
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}
Ok(())
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}
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pub enum EndpointType {
Community,
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Person,
Post,
Comment,
PrivateMessage,
}
/// Generates an apub endpoint for a given domain, IE xyz.tld
pub fn generate_local_apub_endpoint(
endpoint_type: EndpointType,
name: &str,
domain: &str,
) -> Result<DbUrl, ParseError> {
let point = match endpoint_type {
EndpointType::Community => "c",
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EndpointType::Person => "u",
EndpointType::Post => "post",
EndpointType::Comment => "comment",
EndpointType::PrivateMessage => "private_message",
};
Ok(Url::parse(&format!("{}/{}/{}", domain, point, name))?.into())
}
pub fn generate_followers_url(actor_id: &DbUrl) -> Result<DbUrl, ParseError> {
Ok(Url::parse(&format!("{}/followers", actor_id))?.into())
}
pub fn generate_inbox_url(actor_id: &DbUrl) -> Result<DbUrl, ParseError> {
Ok(Url::parse(&format!("{}/inbox", actor_id))?.into())
}
pub fn generate_shared_inbox_url(actor_id: &DbUrl) -> Result<DbUrl, LemmyError> {
let actor_id: Url = actor_id.clone().into();
let url = format!(
"{}://{}{}/inbox",
&actor_id.scheme(),
&actor_id.host_str().context(location_info!())?,
if let Some(port) = actor_id.port() {
format!(":{}", port)
} else {
"".to_string()
},
);
Ok(Url::parse(&url)?.into())
}
pub fn generate_outbox_url(actor_id: &DbUrl) -> Result<DbUrl, ParseError> {
Ok(Url::parse(&format!("{}/outbox", actor_id))?.into())
}
fn generate_moderators_url(community_id: &DbUrl) -> Result<DbUrl, LemmyError> {
Ok(Url::parse(&format!("{}/moderators", community_id))?.into())
}
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/// Store a sent or received activity in the database, for logging purposes. These records are not
/// persistent.
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async fn insert_activity(
ap_id: &Url,
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activity: serde_json::Value,
local: bool,
sensitive: bool,
pool: &DbPool,
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) -> Result<(), LemmyError> {
let ap_id = ap_id.to_owned().into();
blocking(pool, move |conn| {
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Activity::insert(conn, ap_id, activity, local, sensitive)
})
.await??;
Ok(())
}