lemmy/crates/api_common/src/lib.rs

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Rust
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pub mod comment;
pub mod community;
pub mod person;
pub mod post;
pub mod site;
pub mod websocket;
use crate::site::FederatedInstances;
use lemmy_db_schema::{
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newtypes::{CommunityId, LocalUserId, PersonId, PostId},
source::{
community::Community,
person_block::PersonBlock,
post::{Post, PostRead, PostReadForm},
secret::Secret,
site::Site,
},
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traits::{Crud, Readable},
DbPool,
};
use lemmy_db_views::local_user_view::{LocalUserSettingsView, LocalUserView};
use lemmy_db_views_actor::{
community_person_ban_view::CommunityPersonBanView,
community_view::CommunityView,
};
use lemmy_utils::{claims::Claims, settings::structs::FederationConfig, ApiError, LemmyError};
use url::Url;
pub async fn blocking<F, T>(pool: &DbPool, f: F) -> Result<T, LemmyError>
where
F: FnOnce(&diesel::PgConnection) -> T + Send + 'static,
T: Send + 'static,
{
let pool = pool.clone();
let res = actix_web::web::block(move || {
let conn = pool.get()?;
let res = (f)(&conn);
Ok(res) as Result<T, LemmyError>
})
.await?;
res
}
pub async fn is_mod_or_admin(
pool: &DbPool,
person_id: PersonId,
community_id: CommunityId,
) -> Result<(), LemmyError> {
let is_mod_or_admin = blocking(pool, move |conn| {
CommunityView::is_mod_or_admin(conn, person_id, community_id)
})
.await?;
if !is_mod_or_admin {
return Err(ApiError::err_plain("not_a_mod_or_admin").into());
}
Ok(())
}
pub fn is_admin(local_user_view: &LocalUserView) -> Result<(), LemmyError> {
if !local_user_view.person.admin {
return Err(ApiError::err_plain("not_an_admin").into());
}
Ok(())
}
pub async fn get_post(post_id: PostId, pool: &DbPool) -> Result<Post, LemmyError> {
blocking(pool, move |conn| Post::read(conn, post_id))
.await?
.map_err(|_| ApiError::err_plain("couldnt_find_post").into())
}
pub async fn mark_post_as_read(
person_id: PersonId,
post_id: PostId,
pool: &DbPool,
) -> Result<PostRead, LemmyError> {
let post_read_form = PostReadForm { post_id, person_id };
blocking(pool, move |conn| {
PostRead::mark_as_read(conn, &post_read_form)
})
.await?
.map_err(|_| ApiError::err_plain("couldnt_mark_post_as_read").into())
}
pub async fn get_local_user_view_from_jwt(
jwt: &str,
pool: &DbPool,
secret: &Secret,
) -> Result<LocalUserView, LemmyError> {
let claims = Claims::decode(jwt, &secret.jwt_secret)
.map_err(|e| ApiError::err("not_logged_in", e))?
.claims;
let local_user_id = LocalUserId(claims.sub);
let local_user_view =
blocking(pool, move |conn| LocalUserView::read(conn, local_user_id)).await??;
// Check for a site ban
if local_user_view.person.banned {
return Err(ApiError::err_plain("site_ban").into());
}
// Check for user deletion
if local_user_view.person.deleted {
return Err(ApiError::err_plain("deleted").into());
}
check_validator_time(&local_user_view.local_user.validator_time, &claims)?;
Ok(local_user_view)
}
/// Checks if user's token was issued before user's password reset.
pub fn check_validator_time(
validator_time: &chrono::NaiveDateTime,
claims: &Claims,
) -> Result<(), LemmyError> {
let user_validation_time = validator_time.timestamp();
if user_validation_time > claims.iat {
Err(ApiError::err_plain("not_logged_in").into())
} else {
Ok(())
}
}
pub async fn get_local_user_view_from_jwt_opt(
jwt: &Option<String>,
pool: &DbPool,
secret: &Secret,
) -> Result<Option<LocalUserView>, LemmyError> {
match jwt {
Some(jwt) => Ok(Some(get_local_user_view_from_jwt(jwt, pool, secret).await?)),
None => Ok(None),
}
}
pub async fn get_local_user_settings_view_from_jwt(
jwt: &str,
pool: &DbPool,
secret: &Secret,
) -> Result<LocalUserSettingsView, LemmyError> {
let claims = Claims::decode(jwt, &secret.jwt_secret)
.map_err(|e| ApiError::err("not_logged_in", e))?
.claims;
let local_user_id = LocalUserId(claims.sub);
let local_user_view = blocking(pool, move |conn| {
LocalUserSettingsView::read(conn, local_user_id)
})
.await??;
// Check for a site ban
if local_user_view.person.banned {
return Err(ApiError::err_plain("site_ban").into());
}
check_validator_time(&local_user_view.local_user.validator_time, &claims)?;
Ok(local_user_view)
}
pub async fn get_local_user_settings_view_from_jwt_opt(
jwt: &Option<String>,
pool: &DbPool,
secret: &Secret,
) -> Result<Option<LocalUserSettingsView>, LemmyError> {
match jwt {
Some(jwt) => Ok(Some(
get_local_user_settings_view_from_jwt(jwt, pool, secret).await?,
)),
None => Ok(None),
}
}
pub async fn check_community_ban(
person_id: PersonId,
community_id: CommunityId,
pool: &DbPool,
) -> Result<(), LemmyError> {
let is_banned =
move |conn: &'_ _| CommunityPersonBanView::get(conn, person_id, community_id).is_ok();
if blocking(pool, is_banned).await? {
Err(ApiError::err_plain("community_ban").into())
} else {
Ok(())
}
}
pub async fn check_community_deleted_or_removed(
community_id: CommunityId,
pool: &DbPool,
) -> Result<(), LemmyError> {
let community = blocking(pool, move |conn| Community::read(conn, community_id))
.await?
.map_err(|e| ApiError::err("couldnt_find_community", e))?;
if community.deleted || community.removed {
Err(ApiError::err_plain("deleted").into())
} else {
Ok(())
}
}
pub fn check_post_deleted_or_removed(post: &Post) -> Result<(), LemmyError> {
if post.deleted || post.removed {
Err(ApiError::err_plain("deleted").into())
} else {
Ok(())
}
}
pub async fn check_person_block(
my_id: PersonId,
potential_blocker_id: PersonId,
pool: &DbPool,
) -> Result<(), LemmyError> {
let is_blocked = move |conn: &'_ _| PersonBlock::read(conn, potential_blocker_id, my_id).is_ok();
if blocking(pool, is_blocked).await? {
Err(ApiError::err_plain("person_block").into())
} else {
Ok(())
}
}
pub async fn check_downvotes_enabled(score: i16, pool: &DbPool) -> Result<(), LemmyError> {
if score == -1 {
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let site = blocking(pool, Site::read_simple).await??;
if !site.enable_downvotes {
return Err(ApiError::err_plain("downvotes_disabled").into());
}
}
Ok(())
}
pub async fn build_federated_instances(
pool: &DbPool,
federation_config: &FederationConfig,
hostname: &str,
) -> Result<Option<FederatedInstances>, LemmyError> {
let federation = federation_config.to_owned();
if federation.enabled {
let distinct_communities = blocking(pool, move |conn| {
Community::distinct_federated_communities(conn)
})
.await??;
let allowed = federation.allowed_instances;
let blocked = federation.blocked_instances;
let mut linked = distinct_communities
.iter()
.map(|actor_id| Ok(Url::parse(actor_id)?.host_str().unwrap_or("").to_string()))
.collect::<Result<Vec<String>, LemmyError>>()?;
if let Some(allowed) = allowed.as_ref() {
linked.extend_from_slice(allowed);
}
if let Some(blocked) = blocked.as_ref() {
linked.retain(|a| !blocked.contains(a) && !a.eq(hostname));
}
// Sort and remove dupes
linked.sort_unstable();
linked.dedup();
Ok(Some(FederatedInstances {
linked,
allowed,
blocked,
}))
} else {
Ok(None)
}
}
/// Checks the password length
pub fn password_length_check(pass: &str) -> Result<(), LemmyError> {
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if !(10..=60).contains(&pass.len()) {
Err(ApiError::err_plain("invalid_password").into())
} else {
Ok(())
}
}
/// Checks the site description length
pub fn site_description_length_check(description: &str) -> Result<(), LemmyError> {
if description.len() > 150 {
Err(ApiError::err_plain("site_description_length_overflow").into())
} else {
Ok(())
}
}
/// Checks for a honeypot. If this field is filled, fail the rest of the function
pub fn honeypot_check(honeypot: &Option<String>) -> Result<(), LemmyError> {
if honeypot.is_some() {
Err(ApiError::err_plain("honeypot_fail").into())
} else {
Ok(())
}
}