lemmy/crates/api_common/src/utils.rs

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use crate::{
context::LemmyContext,
request::purge_image_from_pictrs,
sensitive::Sensitive,
site::FederatedInstances,
};
use anyhow::Context;
use chrono::NaiveDateTime;
use futures::try_join;
use lemmy_db_schema::{
impls::person::is_banned,
newtypes::{CommunityId, DbUrl, LocalUserId, PersonId, PostId},
source::{
comment::{Comment, CommentUpdateForm},
community::{Community, CommunityModerator, CommunityUpdateForm},
email_verification::{EmailVerification, EmailVerificationForm},
instance::Instance,
local_site::LocalSite,
local_site_rate_limit::LocalSiteRateLimit,
password_reset_request::PasswordResetRequest,
person::{Person, PersonUpdateForm},
person_block::PersonBlock,
post::{Post, PostRead, PostReadForm},
registration_application::RegistrationApplication,
},
traits::{Crud, Readable},
utils::DbPool,
RegistrationMode,
};
use lemmy_db_views::{comment_view::CommentQuery, structs::LocalUserView};
use lemmy_db_views_actor::structs::{
CommunityModeratorView,
CommunityPersonBanView,
CommunityView,
};
use lemmy_utils::{
claims::Claims,
email::{send_email, translations::Lang},
error::LemmyError,
location_info,
rate_limit::RateLimitConfig,
settings::structs::Settings,
utils::slurs::build_slur_regex,
};
use regex::Regex;
use reqwest_middleware::ClientWithMiddleware;
use rosetta_i18n::{Language, LanguageId};
use tracing::warn;
use url::{ParseError, Url};
#[tracing::instrument(skip_all)]
pub async fn is_mod_or_admin(
pool: &DbPool,
person_id: PersonId,
community_id: CommunityId,
) -> Result<(), LemmyError> {
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let is_mod_or_admin = CommunityView::is_mod_or_admin(pool, person_id, community_id).await?;
if !is_mod_or_admin {
return Err(LemmyError::from_message("not_a_mod_or_admin"));
}
Ok(())
}
#[tracing::instrument(skip_all)]
pub async fn is_mod_or_admin_opt(
pool: &DbPool,
local_user_view: Option<&LocalUserView>,
community_id: Option<CommunityId>,
) -> Result<(), LemmyError> {
if let Some(local_user_view) = local_user_view {
if let Some(community_id) = community_id {
is_mod_or_admin(pool, local_user_view.person.id, community_id).await
} else {
is_admin(local_user_view)
}
} else {
Err(LemmyError::from_message("not_a_mod_or_admin"))
}
}
pub fn is_admin(local_user_view: &LocalUserView) -> Result<(), LemmyError> {
if !local_user_view.person.admin {
return Err(LemmyError::from_message("not_an_admin"));
}
Ok(())
}
pub fn is_top_mod(
local_user_view: &LocalUserView,
community_mods: &[CommunityModeratorView],
) -> Result<(), LemmyError> {
if local_user_view.person.id
!= community_mods
.first()
.map(|cm| cm.moderator.id)
.unwrap_or(PersonId(0))
{
return Err(LemmyError::from_message("not_top_mod"));
}
Ok(())
}
#[tracing::instrument(skip_all)]
pub async fn get_post(post_id: PostId, pool: &DbPool) -> Result<Post, LemmyError> {
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Post::read(pool, post_id)
.await
.map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))
}
#[tracing::instrument(skip_all)]
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 };
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PostRead::mark_as_read(pool, &post_read_form)
.await
.map_err(|e| LemmyError::from_error_message(e, "couldnt_mark_post_as_read"))
}
#[tracing::instrument(skip_all)]
pub async fn mark_post_as_unread(
person_id: PersonId,
post_id: PostId,
pool: &DbPool,
) -> Result<usize, LemmyError> {
let post_read_form = PostReadForm { post_id, person_id };
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PostRead::mark_as_unread(pool, &post_read_form)
.await
.map_err(|e| LemmyError::from_error_message(e, "couldnt_mark_post_as_read"))
}
#[tracing::instrument(skip_all)]
pub async fn local_user_view_from_jwt(
jwt: &str,
context: &LemmyContext,
) -> Result<LocalUserView, LemmyError> {
let claims = Claims::decode(jwt, &context.secret().jwt_secret)
.map_err(|e| e.with_message("not_logged_in"))?
.claims;
let local_user_id = LocalUserId(claims.sub);
let local_user_view = LocalUserView::read(context.pool(), local_user_id).await?;
check_user_valid(
local_user_view.person.banned,
local_user_view.person.ban_expires,
local_user_view.person.deleted,
)?;
check_validator_time(&local_user_view.local_user.validator_time, &claims)?;
Ok(local_user_view)
}
#[tracing::instrument(skip_all)]
pub async fn local_user_view_from_jwt_opt(
jwt: Option<&Sensitive<String>>,
context: &LemmyContext,
) -> Option<LocalUserView> {
local_user_view_from_jwt(jwt?, context).await.ok()
}
/// Checks if user's token was issued before user's password reset.
pub fn check_validator_time(
validator_time: &NaiveDateTime,
claims: &Claims,
) -> Result<(), LemmyError> {
let user_validation_time = validator_time.timestamp();
if user_validation_time > claims.iat {
Err(LemmyError::from_message("not_logged_in"))
} else {
Ok(())
}
}
pub fn check_user_valid(
banned: bool,
ban_expires: Option<NaiveDateTime>,
deleted: bool,
) -> Result<(), LemmyError> {
// Check for a site ban
if is_banned(banned, ban_expires) {
return Err(LemmyError::from_message("site_ban"));
}
// check for account deletion
if deleted {
return Err(LemmyError::from_message("deleted"));
}
Ok(())
}
#[tracing::instrument(skip_all)]
pub async fn check_community_ban(
person_id: PersonId,
community_id: CommunityId,
pool: &DbPool,
) -> Result<(), LemmyError> {
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let is_banned = CommunityPersonBanView::get(pool, person_id, community_id)
.await
.is_ok();
if is_banned {
Err(LemmyError::from_message("community_ban"))
} else {
Ok(())
}
}
#[tracing::instrument(skip_all)]
pub async fn check_community_deleted_or_removed(
community_id: CommunityId,
pool: &DbPool,
) -> Result<(), LemmyError> {
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let community = Community::read(pool, community_id)
.await
.map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
if community.deleted || community.removed {
Err(LemmyError::from_message("deleted"))
} else {
Ok(())
}
}
pub fn check_post_deleted_or_removed(post: &Post) -> Result<(), LemmyError> {
if post.deleted || post.removed {
Err(LemmyError::from_message("deleted"))
} else {
Ok(())
}
}
#[tracing::instrument(skip_all)]
pub async fn check_person_block(
my_id: PersonId,
potential_blocker_id: PersonId,
pool: &DbPool,
) -> Result<(), LemmyError> {
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let is_blocked = PersonBlock::read(pool, potential_blocker_id, my_id)
.await
.is_ok();
if is_blocked {
Err(LemmyError::from_message("person_block"))
} else {
Ok(())
}
}
#[tracing::instrument(skip_all)]
pub fn check_downvotes_enabled(score: i16, local_site: &LocalSite) -> Result<(), LemmyError> {
if score == -1 && !local_site.enable_downvotes {
return Err(LemmyError::from_message("downvotes_disabled"));
}
Ok(())
}
#[tracing::instrument(skip_all)]
pub fn check_private_instance(
local_user_view: &Option<LocalUserView>,
local_site: &LocalSite,
) -> Result<(), LemmyError> {
if local_user_view.is_none() && local_site.private_instance {
return Err(LemmyError::from_message("instance_is_private"));
}
Ok(())
}
#[tracing::instrument(skip_all)]
pub async fn build_federated_instances(
local_site: &LocalSite,
pool: &DbPool,
) -> Result<Option<FederatedInstances>, LemmyError> {
if local_site.federation_enabled {
// TODO I hate that this requires 3 queries
let (linked, allowed, blocked) = try_join!(
Instance::linked(pool),
Instance::allowlist(pool),
Instance::blocklist(pool)
)?;
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.chars().count()) {
Err(LemmyError::from_message("invalid_password"))
} 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() && honeypot != &Some(String::new()) {
Err(LemmyError::from_message("honeypot_fail"))
} else {
Ok(())
}
}
pub fn send_email_to_user(
local_user_view: &LocalUserView,
subject: &str,
body: &str,
settings: &Settings,
) {
if local_user_view.person.banned || !local_user_view.local_user.send_notifications_to_email {
return;
}
if let Some(user_email) = &local_user_view.local_user.email {
match send_email(
subject,
user_email,
&local_user_view.person.name,
body,
settings,
) {
Ok(_o) => _o,
Err(e) => warn!("{}", e),
};
}
}
pub async fn send_password_reset_email(
user: &LocalUserView,
pool: &DbPool,
settings: &Settings,
) -> Result<(), LemmyError> {
// Generate a random token
let token = uuid::Uuid::new_v4().to_string();
// Insert the row
let token2 = token.clone();
let local_user_id = user.local_user.id;
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PasswordResetRequest::create_token(pool, local_user_id, &token2).await?;
let email = &user.local_user.email.clone().expect("email");
let lang = get_interface_language(user);
let subject = &lang.password_reset_subject(&user.person.name);
let protocol_and_hostname = settings.get_protocol_and_hostname();
let reset_link = format!("{}/password_change/{}", protocol_and_hostname, &token);
let body = &lang.password_reset_body(reset_link, &user.person.name);
send_email(subject, email, &user.person.name, body, settings)
}
/// Send a verification email
pub async fn send_verification_email(
user: &LocalUserView,
new_email: &str,
pool: &DbPool,
settings: &Settings,
) -> Result<(), LemmyError> {
let form = EmailVerificationForm {
local_user_id: user.local_user.id,
email: new_email.to_string(),
verification_token: uuid::Uuid::new_v4().to_string(),
};
let verify_link = format!(
"{}/verify_email/{}",
settings.get_protocol_and_hostname(),
&form.verification_token
);
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EmailVerification::create(pool, &form).await?;
let lang = get_interface_language(user);
let subject = lang.verify_email_subject(&settings.hostname);
let body = lang.verify_email_body(&settings.hostname, &user.person.name, verify_link);
send_email(&subject, new_email, &user.person.name, &body, settings)?;
Ok(())
}
pub fn get_interface_language(user: &LocalUserView) -> Lang {
lang_str_to_lang(&user.local_user.interface_language)
}
pub fn get_interface_language_from_settings(user: &LocalUserView) -> Lang {
lang_str_to_lang(&user.local_user.interface_language)
}
fn lang_str_to_lang(lang: &str) -> Lang {
let lang_id = LanguageId::new(lang);
Lang::from_language_id(&lang_id).unwrap_or_else(|| {
let en = LanguageId::new("en");
Lang::from_language_id(&en).expect("default language")
})
}
pub fn local_site_rate_limit_to_rate_limit_config(
local_site_rate_limit: &LocalSiteRateLimit,
) -> RateLimitConfig {
let l = local_site_rate_limit;
RateLimitConfig {
message: l.message,
message_per_second: l.message_per_second,
post: l.post,
post_per_second: l.post_per_second,
register: l.register,
register_per_second: l.register_per_second,
image: l.image,
image_per_second: l.image_per_second,
comment: l.comment,
comment_per_second: l.comment_per_second,
search: l.search,
search_per_second: l.search_per_second,
}
}
pub fn local_site_to_slur_regex(local_site: &LocalSite) -> Option<Regex> {
build_slur_regex(local_site.slur_filter_regex.as_deref())
}
pub fn local_site_opt_to_slur_regex(local_site: &Option<LocalSite>) -> Option<Regex> {
local_site
.as_ref()
.map(local_site_to_slur_regex)
.unwrap_or(None)
}
pub fn send_application_approved_email(
user: &LocalUserView,
settings: &Settings,
) -> Result<(), LemmyError> {
let email = &user.local_user.email.clone().expect("email");
let lang = get_interface_language(user);
let subject = lang.registration_approved_subject(&user.person.actor_id);
let body = lang.registration_approved_body(&settings.hostname);
send_email(&subject, email, &user.person.name, &body, settings)
}
/// Send a new applicant email notification to all admins
pub async fn send_new_applicant_email_to_admins(
applicant_username: &str,
pool: &DbPool,
settings: &Settings,
) -> Result<(), LemmyError> {
// Collect the admins with emails
let admins = LocalUserView::list_admins_with_emails(pool).await?;
let applications_link = &format!(
"{}/registration_applications",
settings.get_protocol_and_hostname(),
);
for admin in &admins {
let email = &admin.local_user.email.clone().expect("email");
let lang = get_interface_language_from_settings(admin);
let subject = lang.new_application_subject(&settings.hostname, applicant_username);
let body = lang.new_application_body(applications_link);
send_email(&subject, email, &admin.person.name, &body, settings)?;
}
Ok(())
}
/// Send a report to all admins
pub async fn send_new_report_email_to_admins(
reporter_username: &str,
reported_username: &str,
pool: &DbPool,
settings: &Settings,
) -> Result<(), LemmyError> {
// Collect the admins with emails
let admins = LocalUserView::list_admins_with_emails(pool).await?;
let reports_link = &format!("{}/reports", settings.get_protocol_and_hostname(),);
for admin in &admins {
let email = &admin.local_user.email.clone().expect("email");
let lang = get_interface_language_from_settings(admin);
let subject = lang.new_report_subject(&settings.hostname, reported_username, reporter_username);
let body = lang.new_report_body(reports_link);
send_email(&subject, email, &admin.person.name, &body, settings)?;
}
Ok(())
}
pub async fn check_registration_application(
local_user_view: &LocalUserView,
local_site: &LocalSite,
pool: &DbPool,
) -> Result<(), LemmyError> {
if (local_site.registration_mode == RegistrationMode::RequireApplication
|| local_site.registration_mode == RegistrationMode::Closed)
&& !local_user_view.local_user.accepted_application
&& !local_user_view.person.admin
{
// Fetch the registration, see if its denied
let local_user_id = local_user_view.local_user.id;
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let registration = RegistrationApplication::find_by_local_user_id(pool, local_user_id).await?;
if let Some(deny_reason) = registration.deny_reason {
let lang = get_interface_language(local_user_view);
let registration_denied_message = format!("{}: {}", lang.registration_denied(), &deny_reason);
return Err(LemmyError::from_message(&registration_denied_message));
} else {
return Err(LemmyError::from_message("registration_application_pending"));
}
}
Ok(())
}
pub fn check_private_instance_and_federation_enabled(
local_site: &LocalSite,
) -> Result<(), LemmyError> {
if local_site.private_instance && local_site.federation_enabled {
return Err(LemmyError::from_message(
"Cannot have both private instance and federation enabled.",
));
}
Ok(())
}
pub async fn purge_image_posts_for_person(
banned_person_id: PersonId,
pool: &DbPool,
settings: &Settings,
client: &ClientWithMiddleware,
) -> Result<(), LemmyError> {
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let posts = Post::fetch_pictrs_posts_for_creator(pool, banned_person_id).await?;
for post in posts {
if let Some(url) = post.url {
purge_image_from_pictrs(client, settings, &url).await.ok();
}
if let Some(thumbnail_url) = post.thumbnail_url {
purge_image_from_pictrs(client, settings, &thumbnail_url)
.await
.ok();
}
}
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Post::remove_pictrs_post_images_and_thumbnails_for_creator(pool, banned_person_id).await?;
Ok(())
}
pub async fn purge_image_posts_for_community(
banned_community_id: CommunityId,
pool: &DbPool,
settings: &Settings,
client: &ClientWithMiddleware,
) -> Result<(), LemmyError> {
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let posts = Post::fetch_pictrs_posts_for_community(pool, banned_community_id).await?;
for post in posts {
if let Some(url) = post.url {
purge_image_from_pictrs(client, settings, &url).await.ok();
}
if let Some(thumbnail_url) = post.thumbnail_url {
purge_image_from_pictrs(client, settings, &thumbnail_url)
.await
.ok();
}
}
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Post::remove_pictrs_post_images_and_thumbnails_for_community(pool, banned_community_id).await?;
Ok(())
}
pub async fn remove_user_data(
banned_person_id: PersonId,
pool: &DbPool,
settings: &Settings,
client: &ClientWithMiddleware,
) -> Result<(), LemmyError> {
// Purge user images
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let person = Person::read(pool, banned_person_id).await?;
if let Some(avatar) = person.avatar {
purge_image_from_pictrs(client, settings, &avatar)
.await
.ok();
}
if let Some(banner) = person.banner {
purge_image_from_pictrs(client, settings, &banner)
.await
.ok();
}
// Update the fields to None
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Person::update(
pool,
banned_person_id,
&PersonUpdateForm::builder()
.avatar(Some(None))
.banner(Some(None))
.build(),
)
.await?;
// Posts
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Post::update_removed_for_creator(pool, banned_person_id, None, true).await?;
// Purge image posts
purge_image_posts_for_person(banned_person_id, pool, settings, client).await?;
// Communities
// Remove all communities where they're the top mod
// for now, remove the communities manually
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let first_mod_communities = CommunityModeratorView::get_community_first_mods(pool).await?;
// Filter to only this banned users top communities
let banned_user_first_communities: Vec<CommunityModeratorView> = first_mod_communities
.into_iter()
.filter(|fmc| fmc.moderator.id == banned_person_id)
.collect();
for first_mod_community in banned_user_first_communities {
let community_id = first_mod_community.community.id;
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Community::update(
pool,
community_id,
&CommunityUpdateForm::builder().removed(Some(true)).build(),
)
.await?;
// Delete the community images
if let Some(icon) = first_mod_community.community.icon {
purge_image_from_pictrs(client, settings, &icon).await.ok();
}
if let Some(banner) = first_mod_community.community.banner {
purge_image_from_pictrs(client, settings, &banner)
.await
.ok();
}
// Update the fields to None
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Community::update(
pool,
community_id,
&CommunityUpdateForm::builder()
.icon(Some(None))
.banner(Some(None))
.build(),
)
.await?;
}
// Comments
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Comment::update_removed_for_creator(pool, banned_person_id, true).await?;
Ok(())
}
pub async fn remove_user_data_in_community(
community_id: CommunityId,
banned_person_id: PersonId,
pool: &DbPool,
) -> Result<(), LemmyError> {
// Posts
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Post::update_removed_for_creator(pool, banned_person_id, Some(community_id), true).await?;
// Comments
// TODO Diesel doesn't allow updates with joins, so this has to be a loop
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let comments = CommentQuery::builder()
.pool(pool)
.creator_id(Some(banned_person_id))
.community_id(Some(community_id))
.limit(Some(i64::MAX))
.build()
.list()
.await?;
for comment_view in &comments {
let comment_id = comment_view.comment.id;
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Comment::update(
pool,
comment_id,
&CommentUpdateForm::builder().removed(Some(true)).build(),
)
.await?;
}
Ok(())
}
pub async fn delete_user_account(
person_id: PersonId,
pool: &DbPool,
settings: &Settings,
client: &ClientWithMiddleware,
) -> Result<(), LemmyError> {
// Delete their images
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let person = Person::read(pool, person_id).await?;
if let Some(avatar) = person.avatar {
purge_image_from_pictrs(client, settings, &avatar)
.await
.ok();
}
if let Some(banner) = person.banner {
purge_image_from_pictrs(client, settings, &banner)
.await
.ok();
}
// No need to update avatar and banner, those are handled in Person::delete_account
// Comments
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Comment::permadelete_for_creator(pool, person_id)
.await
.map_err(|e| LemmyError::from_error_message(e, "couldnt_update_comment"))?;
// Posts
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Post::permadelete_for_creator(pool, person_id)
.await
.map_err(|e| LemmyError::from_error_message(e, "couldnt_update_post"))?;
// Purge image posts
purge_image_posts_for_person(person_id, pool, settings, client).await?;
// Leave communities they mod
CommunityModerator::leave_all_communities(pool, person_id).await?;
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Person::delete_account(pool, person_id).await?;
Ok(())
}
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#[cfg(test)]
mod tests {
use crate::utils::{honeypot_check, password_length_check};
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#[test]
#[rustfmt::skip]
fn password_length() {
assert!(password_length_check("Õ¼¾°3yË,o¸ãtÌÈú|ÇÁÙAøüÒI©·¤(T]/ð>æºWæ[C¤bªWöaÃÎñ·{=û³&§½K/c").is_ok());
assert!(password_length_check("1234567890").is_ok());
assert!(password_length_check("short").is_err());
assert!(password_length_check("looooooooooooooooooooooooooooooooooooooooooooooooooooooooooong").is_err());
}
#[test]
fn honeypot() {
assert!(honeypot_check(&None).is_ok());
assert!(honeypot_check(&Some(String::new())).is_ok());
assert!(honeypot_check(&Some("1".to_string())).is_err());
assert!(honeypot_check(&Some("message".to_string())).is_err());
}
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}
pub enum EndpointType {
Community,
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",
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!("{actor_id}/followers"))?.into())
}
pub fn generate_inbox_url(actor_id: &DbUrl) -> Result<DbUrl, ParseError> {
Ok(Url::parse(&format!("{actor_id}/inbox"))?.into())
}
pub fn generate_site_inbox_url(actor_id: &DbUrl) -> Result<DbUrl, ParseError> {
let mut actor_id: Url = actor_id.clone().into();
actor_id.set_path("site_inbox");
Ok(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 {
String::new()
},
);
Ok(Url::parse(&url)?.into())
}
pub fn generate_outbox_url(actor_id: &DbUrl) -> Result<DbUrl, ParseError> {
Ok(Url::parse(&format!("{actor_id}/outbox"))?.into())
}
pub fn generate_featured_url(actor_id: &DbUrl) -> Result<DbUrl, ParseError> {
Ok(Url::parse(&format!("{actor_id}/featured"))?.into())
}
pub fn generate_moderators_url(community_id: &DbUrl) -> Result<DbUrl, LemmyError> {
Ok(Url::parse(&format!("{community_id}/moderators"))?.into())
}