lemmy/crates/api_common/src/utils.rs
Nutomic 6d27bfed08
Handle invalid ban expires values (fixes #4045) (#4046)
* Handle invalid ban expires values (fixes #4045)

* Adding a few missing expire time checks. Fixing up time conversions. (#4051)

* Adding a few missing expire time checks. Fixing up time conversions.

* Increase settings export wait time.

* get rid of RemoveCommunity.expires

* fmt

* tests

---------

Co-authored-by: Dessalines <dessalines@users.noreply.github.com>
2023-10-17 13:25:35 -04:00

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use crate::{
context::LemmyContext,
request::purge_image_from_pictrs,
sensitive::Sensitive,
site::FederatedInstances,
};
use actix_web::cookie::{Cookie, SameSite};
use anyhow::Context;
use chrono::{DateTime, Days, Local, TimeZone, Utc};
use lemmy_db_schema::{
newtypes::{CommunityId, DbUrl, 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},
},
traits::Crud,
utils::DbPool,
};
use lemmy_db_views::{comment_view::CommentQuery, structs::LocalUserView};
use lemmy_db_views_actor::structs::{
CommunityModeratorView,
CommunityPersonBanView,
CommunityView,
};
use lemmy_utils::{
email::{send_email, translations::Lang},
error::{LemmyError, LemmyErrorExt, LemmyErrorType, LemmyResult},
location_info,
rate_limit::RateLimitConfig,
settings::structs::Settings,
utils::slurs::build_slur_regex,
};
use regex::Regex;
use rosetta_i18n::{Language, LanguageId};
use std::collections::HashSet;
use tracing::warn;
use url::{ParseError, Url};
pub static AUTH_COOKIE_NAME: &str = "auth";
#[tracing::instrument(skip_all)]
pub async fn is_mod_or_admin(
pool: &mut DbPool<'_>,
person: &Person,
community_id: CommunityId,
) -> Result<(), LemmyError> {
check_user_valid(person)?;
let is_mod_or_admin = CommunityView::is_mod_or_admin(pool, person.id, community_id).await?;
if !is_mod_or_admin {
Err(LemmyErrorType::NotAModOrAdmin)?
} else {
Ok(())
}
}
#[tracing::instrument(skip_all)]
pub async fn is_mod_or_admin_opt(
pool: &mut 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, community_id).await
} else {
is_admin(local_user_view)
}
} else {
Err(LemmyErrorType::NotAModOrAdmin)?
}
}
pub fn is_admin(local_user_view: &LocalUserView) -> Result<(), LemmyError> {
check_user_valid(&local_user_view.person)?;
if !local_user_view.local_user.admin {
Err(LemmyErrorType::NotAnAdmin)?
} else if local_user_view.person.banned {
Err(LemmyErrorType::Banned)?
} else {
Ok(())
}
}
pub fn is_top_mod(
local_user_view: &LocalUserView,
community_mods: &[CommunityModeratorView],
) -> Result<(), LemmyError> {
check_user_valid(&local_user_view.person)?;
if local_user_view.person.id
!= community_mods
.first()
.map(|cm| cm.moderator.id)
.unwrap_or(PersonId(0))
{
Err(LemmyErrorType::NotTopMod)?
} else {
Ok(())
}
}
#[tracing::instrument(skip_all)]
pub async fn get_post(post_id: PostId, pool: &mut DbPool<'_>) -> Result<Post, LemmyError> {
Post::read(pool, post_id)
.await
.with_lemmy_type(LemmyErrorType::CouldntFindPost)
}
#[tracing::instrument(skip_all)]
pub async fn mark_post_as_read(
person_id: PersonId,
post_id: PostId,
pool: &mut DbPool<'_>,
) -> Result<(), LemmyError> {
PostRead::mark_as_read(pool, HashSet::from([post_id]), person_id)
.await
.with_lemmy_type(LemmyErrorType::CouldntMarkPostAsRead)?;
Ok(())
}
pub fn check_user_valid(person: &Person) -> Result<(), LemmyError> {
// Check for a site ban
if person.banned {
Err(LemmyErrorType::SiteBan)?
}
// check for account deletion
else if person.deleted {
Err(LemmyErrorType::Deleted)?
} else {
Ok(())
}
}
/// Checks that a normal user action (eg posting or voting) is allowed in a given community.
///
/// In particular it checks that neither the user nor community are banned or deleted, and that
/// the user isn't banned.
pub async fn check_community_user_action(
person: &Person,
community_id: CommunityId,
pool: &mut DbPool<'_>,
) -> LemmyResult<()> {
check_user_valid(person)?;
check_community_deleted_removed(community_id, pool).await?;
check_community_ban(person, community_id, pool).await?;
Ok(())
}
async fn check_community_deleted_removed(
community_id: CommunityId,
pool: &mut DbPool<'_>,
) -> LemmyResult<()> {
let community = Community::read(pool, community_id)
.await
.with_lemmy_type(LemmyErrorType::CouldntFindCommunity)?;
if community.deleted || community.removed {
Err(LemmyErrorType::Deleted)?
}
Ok(())
}
async fn check_community_ban(
person: &Person,
community_id: CommunityId,
pool: &mut DbPool<'_>,
) -> LemmyResult<()> {
// check if user was banned from site or community
let is_banned = CommunityPersonBanView::get(pool, person.id, community_id).await?;
if is_banned {
Err(LemmyErrorType::BannedFromCommunity)?
}
Ok(())
}
/// Check that the given user can perform a mod action in the community.
///
/// In particular it checks that he is an admin or mod, wasn't banned and the community isn't
/// removed/deleted.
pub async fn check_community_mod_action(
person: &Person,
community_id: CommunityId,
allow_deleted: bool,
pool: &mut DbPool<'_>,
) -> LemmyResult<()> {
is_mod_or_admin(pool, person, community_id).await?;
check_community_ban(person, community_id, pool).await?;
// it must be possible to restore deleted community
if !allow_deleted {
check_community_deleted_removed(community_id, pool).await?;
}
Ok(())
}
pub async fn check_community_mod_action_opt(
local_user_view: &LocalUserView,
community_id: Option<CommunityId>,
pool: &mut DbPool<'_>,
) -> LemmyResult<()> {
if let Some(community_id) = community_id {
check_community_mod_action(&local_user_view.person, community_id, false, pool).await?;
} else {
is_admin(local_user_view)?;
}
Ok(())
}
pub fn check_post_deleted_or_removed(post: &Post) -> Result<(), LemmyError> {
if post.deleted || post.removed {
Err(LemmyErrorType::Deleted)?
} else {
Ok(())
}
}
#[tracing::instrument(skip_all)]
pub async fn check_person_block(
my_id: PersonId,
potential_blocker_id: PersonId,
pool: &mut DbPool<'_>,
) -> Result<(), LemmyError> {
let is_blocked = PersonBlock::read(pool, potential_blocker_id, my_id)
.await
.is_ok();
if is_blocked {
Err(LemmyErrorType::PersonIsBlocked)?
} 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 {
Err(LemmyErrorType::DownvotesAreDisabled)?
} else {
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 {
Err(LemmyErrorType::InstanceIsPrivate)?
} else {
Ok(())
}
}
#[tracing::instrument(skip_all)]
pub async fn build_federated_instances(
local_site: &LocalSite,
pool: &mut DbPool<'_>,
) -> Result<Option<FederatedInstances>, LemmyError> {
if local_site.federation_enabled {
// TODO I hate that this requires 3 queries
let (linked, allowed, blocked) = lemmy_db_schema::try_join_with_pool!(pool => (
Instance::linked,
Instance::allowlist,
Instance::blocklist
))?;
Ok(Some(FederatedInstances {
linked,
allowed,
blocked,
}))
} else {
Ok(None)
}
}
/// Checks the password length
pub fn password_length_check(pass: &str) -> Result<(), LemmyError> {
if !(10..=60).contains(&pass.chars().count()) {
Err(LemmyErrorType::InvalidPassword)?
} 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(LemmyErrorType::HoneypotFailed)?
} else {
Ok(())
}
}
pub async 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,
)
.await
{
Ok(_o) => _o,
Err(e) => warn!("{}", e),
};
}
}
pub async fn send_password_reset_email(
user: &LocalUserView,
pool: &mut DbPool<'_>,
settings: &Settings,
) -> Result<(), LemmyError> {
// Generate a random token
let token = uuid::Uuid::new_v4().to_string();
// Insert the row
let local_user_id = user.local_user.id;
PasswordResetRequest::create_token(pool, local_user_id, token.clone()).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).await
}
/// Send a verification email
pub async fn send_verification_email(
user: &LocalUserView,
new_email: &str,
pool: &mut 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
);
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).await?;
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,
import_user_settings: l.import_user_settings,
import_user_settings_per_second: l.import_user_settings_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 local_site_opt_to_sensitive(local_site: &Option<LocalSite>) -> bool {
local_site
.as_ref()
.map(|site| site.enable_nsfw)
.unwrap_or(false)
}
pub async 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).await
}
/// Send a new applicant email notification to all admins
pub async fn send_new_applicant_email_to_admins(
applicant_username: &str,
pool: &mut 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).await?;
}
Ok(())
}
/// Send a report to all admins
pub async fn send_new_report_email_to_admins(
reporter_username: &str,
reported_username: &str,
pool: &mut 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).await?;
}
Ok(())
}
pub fn check_private_instance_and_federation_enabled(
local_site: &LocalSite,
) -> Result<(), LemmyError> {
if local_site.private_instance && local_site.federation_enabled {
Err(LemmyErrorType::CantEnablePrivateInstanceAndFederationTogether)?
} else {
Ok(())
}
}
pub async fn purge_image_posts_for_person(
banned_person_id: PersonId,
context: &LemmyContext,
) -> Result<(), LemmyError> {
let pool = &mut context.pool();
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(&url, context).await.ok();
}
if let Some(thumbnail_url) = post.thumbnail_url {
purge_image_from_pictrs(&thumbnail_url, context).await.ok();
}
}
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,
context: &LemmyContext,
) -> Result<(), LemmyError> {
let pool = &mut context.pool();
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(&url, context).await.ok();
}
if let Some(thumbnail_url) = post.thumbnail_url {
purge_image_from_pictrs(&thumbnail_url, context).await.ok();
}
}
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,
context: &LemmyContext,
) -> Result<(), LemmyError> {
let pool = &mut context.pool();
// Purge user images
let person = Person::read(pool, banned_person_id).await?;
if let Some(avatar) = person.avatar {
purge_image_from_pictrs(&avatar, context).await.ok();
}
if let Some(banner) = person.banner {
purge_image_from_pictrs(&banner, context).await.ok();
}
// Update the fields to None
Person::update(
pool,
banned_person_id,
&PersonUpdateForm {
avatar: Some(None),
banner: Some(None),
bio: Some(None),
..Default::default()
},
)
.await?;
// Posts
Post::update_removed_for_creator(pool, banned_person_id, None, true).await?;
// Purge image posts
purge_image_posts_for_person(banned_person_id, context).await?;
// Communities
// Remove all communities where they're the top mod
// for now, remove the communities manually
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;
Community::update(
pool,
community_id,
&CommunityUpdateForm {
removed: Some(true),
..Default::default()
},
)
.await?;
// Delete the community images
if let Some(icon) = first_mod_community.community.icon {
purge_image_from_pictrs(&icon, context).await.ok();
}
if let Some(banner) = first_mod_community.community.banner {
purge_image_from_pictrs(&banner, context).await.ok();
}
// Update the fields to None
Community::update(
pool,
community_id,
&CommunityUpdateForm {
icon: Some(None),
banner: Some(None),
..Default::default()
},
)
.await?;
}
// Comments
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: &mut DbPool<'_>,
) -> Result<(), LemmyError> {
// Posts
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
let comments = CommentQuery {
creator_id: Some(banned_person_id),
community_id: Some(community_id),
..Default::default()
}
.list(pool)
.await?;
for comment_view in &comments {
let comment_id = comment_view.comment.id;
Comment::update(
pool,
comment_id,
&CommentUpdateForm {
removed: Some(true),
..Default::default()
},
)
.await?;
}
Ok(())
}
pub async fn purge_user_account(
person_id: PersonId,
context: &LemmyContext,
) -> Result<(), LemmyError> {
let pool = &mut context.pool();
// Delete their images
let person = Person::read(pool, person_id).await?;
if let Some(avatar) = person.avatar {
purge_image_from_pictrs(&avatar, context).await.ok();
}
if let Some(banner) = person.banner {
purge_image_from_pictrs(&banner, context).await.ok();
}
// No need to update avatar and banner, those are handled in Person::delete_account
// Comments
Comment::permadelete_for_creator(pool, person_id)
.await
.with_lemmy_type(LemmyErrorType::CouldntUpdateComment)?;
// Posts
Post::permadelete_for_creator(pool, person_id)
.await
.with_lemmy_type(LemmyErrorType::CouldntUpdatePost)?;
// Purge image posts
purge_image_posts_for_person(person_id, context).await?;
// Leave communities they mod
CommunityModerator::leave_all_communities(pool, person_id).await?;
Person::delete_account(pool, person_id).await?;
Ok(())
}
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())
}
pub fn create_login_cookie(jwt: Sensitive<String>) -> Cookie<'static> {
let mut cookie = Cookie::new(AUTH_COOKIE_NAME, jwt.into_inner());
cookie.set_secure(true);
cookie.set_same_site(SameSite::Lax);
cookie.set_http_only(true);
cookie
}
/// Ensure that ban/block expiry is in valid range. If its in past, throw error. If its more
/// than 10 years in future, convert to permanent ban. Otherwise return the same value.
pub fn check_expire_time(expires_unix_opt: Option<i64>) -> LemmyResult<Option<DateTime<Utc>>> {
if let Some(expires_unix) = expires_unix_opt {
let expires = Utc
.timestamp_opt(expires_unix, 0)
.single()
.ok_or(LemmyErrorType::InvalidUnixTime)?;
limit_expire_time(expires)
} else {
Ok(None)
}
}
fn limit_expire_time(expires: DateTime<Utc>) -> LemmyResult<Option<DateTime<Utc>>> {
const MAX_BAN_TERM: Days = Days::new(10 * 365);
if expires < Local::now() {
Err(LemmyErrorType::BanExpirationInPast)?
} else if expires > Local::now() + MAX_BAN_TERM {
Ok(None)
} else {
Ok(Some(expires))
}
}
#[cfg(test)]
mod tests {
#![allow(clippy::unwrap_used)]
#![allow(clippy::indexing_slicing)]
use crate::utils::{honeypot_check, limit_expire_time, password_length_check};
use chrono::{Days, Utc};
#[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());
}
#[test]
fn test_limit_ban_term() {
// Ban expires in past, should throw error
assert!(limit_expire_time(Utc::now() - Days::new(5)).is_err());
// Legitimate ban term, return same value
let fourteen_days = Utc::now() + Days::new(14);
assert_eq!(
limit_expire_time(fourteen_days).unwrap(),
Some(fourteen_days)
);
let nine_years = Utc::now() + Days::new(365 * 9);
assert_eq!(limit_expire_time(nine_years).unwrap(), Some(nine_years));
// Too long ban term, changes to None (permanent ban)
assert_eq!(
limit_expire_time(Utc::now() + Days::new(365 * 11)).unwrap(),
None
);
}
}