/
validation.rs
643 lines (573 loc) · 19.8 KB
/
validation.rs
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use crate::error::{LemmyErrorExt, LemmyErrorType, LemmyResult};
use itertools::Itertools;
use once_cell::sync::Lazy;
use regex::{Regex, RegexBuilder, RegexSet};
use url::{ParseError, Url};
// From here: https://github.com/vector-im/element-android/blob/develop/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/MatrixPatterns.kt#L35
static VALID_MATRIX_ID_REGEX: Lazy<Regex> = Lazy::new(|| {
Regex::new(r"^@[A-Za-z0-9\x21-\x39\x3B-\x7F]+:[A-Za-z0-9.-]+(:[0-9]{2,5})?$")
.expect("compile regex")
});
// taken from https://en.wikipedia.org/wiki/UTM_parameters
static CLEAN_URL_PARAMS_REGEX: Lazy<Regex> = Lazy::new(|| {
Regex::new(r"^utm_source|utm_medium|utm_campaign|utm_term|utm_content|gclid|gclsrc|dclid|fbclid$")
.expect("compile regex")
});
const ALLOWED_POST_URL_SCHEMES: [&str; 3] = ["http", "https", "magnet"];
const BODY_MAX_LENGTH: usize = 10000;
const POST_BODY_MAX_LENGTH: usize = 50000;
const BIO_MAX_LENGTH: usize = 300;
const ALT_TEXT_MAX_LENGTH: usize = 300;
const SITE_NAME_MAX_LENGTH: usize = 20;
const SITE_NAME_MIN_LENGTH: usize = 1;
const SITE_DESCRIPTION_MAX_LENGTH: usize = 150;
//Invisible unicode characters, taken from https://invisible-characters.com/
const FORBIDDEN_DISPLAY_CHARS: [char; 53] = [
'\u{0009}',
'\u{00a0}',
'\u{00ad}',
'\u{034f}',
'\u{061c}',
'\u{115f}',
'\u{1160}',
'\u{17b4}',
'\u{17b5}',
'\u{180e}',
'\u{2000}',
'\u{2001}',
'\u{2002}',
'\u{2003}',
'\u{2004}',
'\u{2005}',
'\u{2006}',
'\u{2007}',
'\u{2008}',
'\u{2009}',
'\u{200a}',
'\u{200b}',
'\u{200c}',
'\u{200d}',
'\u{200e}',
'\u{200f}',
'\u{202f}',
'\u{205f}',
'\u{2060}',
'\u{2061}',
'\u{2062}',
'\u{2063}',
'\u{2064}',
'\u{206a}',
'\u{206b}',
'\u{206c}',
'\u{206d}',
'\u{206e}',
'\u{206f}',
'\u{3000}',
'\u{2800}',
'\u{3164}',
'\u{feff}',
'\u{ffa0}',
'\u{1d159}',
'\u{1d173}',
'\u{1d174}',
'\u{1d175}',
'\u{1d176}',
'\u{1d177}',
'\u{1d178}',
'\u{1d179}',
'\u{1d17a}',
];
fn has_newline(name: &str) -> bool {
name.contains('\n')
}
pub fn is_valid_actor_name(name: &str, actor_name_max_length: usize) -> LemmyResult<()> {
static VALID_ACTOR_NAME_REGEX_EN: Lazy<Regex> =
Lazy::new(|| Regex::new(r"^[a-zA-Z0-9_]{3,}$").expect("compile regex"));
static VALID_ACTOR_NAME_REGEX_AR: Lazy<Regex> =
Lazy::new(|| Regex::new(r"^[\p{Arabic}0-9_]{3,}$").expect("compile regex"));
static VALID_ACTOR_NAME_REGEX_RU: Lazy<Regex> =
Lazy::new(|| Regex::new(r"^[\p{Cyrillic}0-9_]{3,}$").expect("compile regex"));
let check = name.chars().count() <= actor_name_max_length && !has_newline(name);
// Only allow characters from a single alphabet per username. This avoids problems with lookalike
// characters like `o` which looks identical in Latin and Cyrillic, and can be used to imitate
// other users. Checks for additional alphabets can be added in the same way.
let lang_check = VALID_ACTOR_NAME_REGEX_EN.is_match(name)
|| VALID_ACTOR_NAME_REGEX_AR.is_match(name)
|| VALID_ACTOR_NAME_REGEX_RU.is_match(name);
if !check || !lang_check {
Err(LemmyErrorType::InvalidName.into())
} else {
Ok(())
}
}
fn has_3_permitted_display_chars(name: &str) -> bool {
let mut num_non_fdc: i8 = 0;
for c in name.chars() {
if !FORBIDDEN_DISPLAY_CHARS.contains(&c) {
num_non_fdc += 1;
if num_non_fdc >= 3 {
break;
}
}
}
if num_non_fdc >= 3 {
return true;
}
false
}
// Can't do a regex here, reverse lookarounds not supported
pub fn is_valid_display_name(name: &str, actor_name_max_length: usize) -> LemmyResult<()> {
let check = !name.starts_with('@')
&& !name.starts_with(FORBIDDEN_DISPLAY_CHARS)
&& name.chars().count() <= actor_name_max_length
&& !has_newline(name)
&& has_3_permitted_display_chars(name);
if !check {
Err(LemmyErrorType::InvalidDisplayName.into())
} else {
Ok(())
}
}
pub fn is_valid_matrix_id(matrix_id: &str) -> LemmyResult<()> {
let check = VALID_MATRIX_ID_REGEX.is_match(matrix_id) && !has_newline(matrix_id);
if !check {
Err(LemmyErrorType::InvalidMatrixId.into())
} else {
Ok(())
}
}
pub fn is_valid_post_title(title: &str) -> LemmyResult<()> {
let length = title.trim().chars().count();
let check = (3..=200).contains(&length) && !has_newline(title);
if !check {
Err(LemmyErrorType::InvalidPostTitle.into())
} else {
Ok(())
}
}
/// This could be post bodies, comments, or any description field
pub fn is_valid_body_field(body: &Option<String>, post: bool) -> LemmyResult<()> {
if let Some(body) = body {
if post {
max_length_check(body, POST_BODY_MAX_LENGTH, LemmyErrorType::InvalidBodyField)?;
} else {
max_length_check(body, BODY_MAX_LENGTH, LemmyErrorType::InvalidBodyField)?;
};
}
Ok(())
}
pub fn is_valid_bio_field(bio: &str) -> LemmyResult<()> {
max_length_check(bio, BIO_MAX_LENGTH, LemmyErrorType::BioLengthOverflow)
}
pub fn is_valid_alt_text_field(alt_text: &Option<String>) -> LemmyResult<()> {
if let Some(alt_text) = alt_text {
max_length_check(
alt_text,
ALT_TEXT_MAX_LENGTH,
LemmyErrorType::AltTextLengthOverflow,
)
} else {
Ok(())
}
}
/// Checks the site name length, the limit as defined in the DB.
pub fn site_name_length_check(name: &str) -> LemmyResult<()> {
min_length_check(name, SITE_NAME_MIN_LENGTH, LemmyErrorType::SiteNameRequired)?;
max_length_check(
name,
SITE_NAME_MAX_LENGTH,
LemmyErrorType::SiteNameLengthOverflow,
)
}
/// Checks the site description length, the limit as defined in the DB.
pub fn site_description_length_check(description: &str) -> LemmyResult<()> {
max_length_check(
description,
SITE_DESCRIPTION_MAX_LENGTH,
LemmyErrorType::SiteDescriptionLengthOverflow,
)
}
/// Check minimum and maximum length of input string. If the string is too short or too long, the
/// corresponding error is returned.
///
/// HTML frontends specify maximum input length using `maxlength` attribute.
/// For consistency we use the same counting method (UTF-16 code units).
/// https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/maxlength
fn max_length_check(item: &str, max_length: usize, max_msg: LemmyErrorType) -> LemmyResult<()> {
let len = item.encode_utf16().count();
if len > max_length {
Err(max_msg.into())
} else {
Ok(())
}
}
fn min_length_check(item: &str, min_length: usize, min_msg: LemmyErrorType) -> LemmyResult<()> {
let len = item.encode_utf16().count();
if len < min_length {
Err(min_msg.into())
} else {
Ok(())
}
}
/// Attempts to build a regex and check it for common errors before inserting into the DB.
pub fn build_and_check_regex(regex_str_opt: &Option<&str>) -> LemmyResult<Option<Regex>> {
regex_str_opt.map_or_else(
|| Ok(None::<Regex>),
|regex_str| {
if regex_str.is_empty() {
// If the proposed regex is empty, return as having no regex at all; this is the same
// behavior that happens downstream before the write to the database.
return Ok(None::<Regex>);
}
RegexBuilder::new(regex_str)
.case_insensitive(true)
.build()
.with_lemmy_type(LemmyErrorType::InvalidRegex)
.and_then(|regex| {
// NOTE: It is difficult to know, in the universe of user-crafted regex, which ones
// may match against any string text. To keep it simple, we'll match the regex
// against an innocuous string - a single number - which should help catch a regex
// that accidentally matches against all strings.
if regex.is_match("1") {
Err(LemmyErrorType::PermissiveRegex.into())
} else {
Ok(Some(regex))
}
})
},
)
}
pub fn clean_url_params(url: &Url) -> Url {
let mut url_out = url.clone();
if url.query().is_some() {
let new_query = url
.query_pairs()
.filter(|q| !CLEAN_URL_PARAMS_REGEX.is_match(&q.0))
.map(|q| format!("{}={}", q.0, q.1))
.join("&");
url_out.set_query(Some(&new_query));
}
url_out
}
pub fn check_site_visibility_valid(
current_private_instance: bool,
current_federation_enabled: bool,
new_private_instance: &Option<bool>,
new_federation_enabled: &Option<bool>,
) -> LemmyResult<()> {
let private_instance = new_private_instance.unwrap_or(current_private_instance);
let federation_enabled = new_federation_enabled.unwrap_or(current_federation_enabled);
if private_instance && federation_enabled {
Err(LemmyErrorType::CantEnablePrivateInstanceAndFederationTogether.into())
} else {
Ok(())
}
}
pub fn check_url_scheme(url: &Option<Url>) -> LemmyResult<()> {
if let Some(url) = url {
if !ALLOWED_POST_URL_SCHEMES.contains(&url.scheme()) {
Err(LemmyErrorType::InvalidUrlScheme.into())
} else {
Ok(())
}
} else {
Ok(())
}
}
pub fn is_url_blocked(url: &Option<Url>, blocklist: &RegexSet) -> LemmyResult<()> {
if let Some(url) = url {
if blocklist.is_match(url.as_str()) {
Err(LemmyErrorType::BlockedUrl)?
}
}
Ok(())
}
/// Check that urls are valid, and also remove the scheme, and uniques
pub fn check_urls_are_valid(urls: &Vec<String>) -> LemmyResult<Vec<String>> {
let mut parsed_urls = vec![];
for url in urls {
parsed_urls.push(build_url_str_without_scheme(url)?);
}
let unique_urls = parsed_urls.into_iter().unique().collect();
Ok(unique_urls)
}
pub fn build_url_str_without_scheme(url_str: &str) -> LemmyResult<String> {
// Parse and check for errors
let mut url = Url::parse(url_str).or_else(|e| {
if e == ParseError::RelativeUrlWithoutBase {
Url::parse(&format!("http://{url_str}"))
} else {
Err(e)
}
})?;
// Set the scheme to http, then remove the http:// part
url
.set_scheme("http")
.map_err(|_| LemmyErrorType::InvalidUrl)?;
let mut out = url
.to_string()
.get(7..)
.ok_or(LemmyErrorType::InvalidUrl)?
.to_string();
// Remove trailing / if necessary
if out.ends_with('/') {
out.pop();
}
Ok(out)
}
#[cfg(test)]
#[allow(clippy::unwrap_used)]
#[allow(clippy::indexing_slicing)]
mod tests {
use crate::{
error::LemmyErrorType,
utils::validation::{
build_and_check_regex,
check_site_visibility_valid,
check_url_scheme,
check_urls_are_valid,
clean_url_params,
is_url_blocked,
is_valid_actor_name,
is_valid_bio_field,
is_valid_display_name,
is_valid_matrix_id,
is_valid_post_title,
site_description_length_check,
site_name_length_check,
BIO_MAX_LENGTH,
SITE_DESCRIPTION_MAX_LENGTH,
SITE_NAME_MAX_LENGTH,
},
};
use pretty_assertions::assert_eq;
use url::Url;
#[test]
fn test_clean_url_params() {
let url = Url::parse("https://example.com/path/123?utm_content=buffercf3b2&utm_medium=social&username=randomuser&id=123").unwrap();
let cleaned = clean_url_params(&url);
let expected = Url::parse("https://example.com/path/123?username=randomuser&id=123").unwrap();
assert_eq!(expected.to_string(), cleaned.to_string());
let url = Url::parse("https://example.com/path/123").unwrap();
let cleaned = clean_url_params(&url);
assert_eq!(url.to_string(), cleaned.to_string());
}
#[test]
fn regex_checks() {
assert!(is_valid_post_title("hi").is_err());
assert!(is_valid_post_title("him").is_ok());
assert!(is_valid_post_title(" him ").is_ok());
assert!(is_valid_post_title("n\n\n\n\nanother").is_err());
assert!(is_valid_post_title("hello there!\n this is a test.").is_err());
assert!(is_valid_post_title("hello there! this is a test.").is_ok());
assert!(is_valid_post_title(("12345".repeat(40) + "x").as_str()).is_err());
assert!(is_valid_post_title("12345".repeat(40).as_str()).is_ok());
assert!(is_valid_post_title((("12345".repeat(40)) + " ").as_str()).is_ok());
}
#[test]
fn test_valid_actor_name() {
let actor_name_max_length = 20;
assert!(is_valid_actor_name("Hello_98", actor_name_max_length).is_ok());
assert!(is_valid_actor_name("ten", actor_name_max_length).is_ok());
assert!(is_valid_actor_name("تجريب", actor_name_max_length).is_ok());
assert!(is_valid_actor_name("تجريب_123", actor_name_max_length).is_ok());
assert!(is_valid_actor_name("Владимир", actor_name_max_length).is_ok());
// mixed scripts
assert!(is_valid_actor_name("تجريب_abc", actor_name_max_length).is_err());
assert!(is_valid_actor_name("Влад_abc", actor_name_max_length).is_err());
// dash
assert!(is_valid_actor_name("Hello-98", actor_name_max_length).is_err());
// too short
assert!(is_valid_actor_name("a", actor_name_max_length).is_err());
// empty
assert!(is_valid_actor_name("", actor_name_max_length).is_err());
}
#[test]
fn test_valid_display_name() {
let actor_name_max_length = 20;
assert!(is_valid_display_name("hello @there", actor_name_max_length).is_ok());
assert!(is_valid_display_name("@hello there", actor_name_max_length).is_err());
assert!(is_valid_display_name("\u{200d}hello", actor_name_max_length).is_err());
assert!(is_valid_display_name(
"\u{1f3f3}\u{fe0f}\u{200d}\u{26a7}\u{fe0f}Name",
actor_name_max_length
)
.is_ok());
assert!(is_valid_display_name("\u{2003}1\u{ffa0}2\u{200d}", actor_name_max_length).is_err());
// Make sure zero-space with an @ doesn't work
assert!(
is_valid_display_name(&format!("{}@my name is", '\u{200b}'), actor_name_max_length).is_err()
);
}
#[test]
fn test_valid_post_title() {
assert!(is_valid_post_title("Post Title").is_ok());
assert!(is_valid_post_title(
"აშშ ითხოვს ირანს დაუყოვნებლივ გაანთავისუფლოს დაკავებული ნავთობის ტანკერი"
)
.is_ok());
assert!(is_valid_post_title(" POST TITLE 😃😃😃😃😃").is_ok());
assert!(is_valid_post_title("\n \n \n \n ").is_err()); // tabs/spaces/newlines
}
#[test]
fn test_valid_matrix_id() {
assert!(is_valid_matrix_id("@dess:matrix.org").is_ok());
assert!(is_valid_matrix_id("@dess_:matrix.org").is_ok());
assert!(is_valid_matrix_id("@dess:matrix.org:443").is_ok());
assert!(is_valid_matrix_id("dess:matrix.org").is_err());
assert!(is_valid_matrix_id(" @dess:matrix.org").is_err());
assert!(is_valid_matrix_id("@dess:matrix.org t").is_err());
assert!(is_valid_matrix_id("@dess:matrix.org t").is_err());
}
#[test]
fn test_valid_site_name() {
let valid_names = [
(0..SITE_NAME_MAX_LENGTH).map(|_| 'A').collect::<String>(),
String::from("A"),
];
let invalid_names = [
(
&(0..SITE_NAME_MAX_LENGTH + 1)
.map(|_| 'A')
.collect::<String>(),
LemmyErrorType::SiteNameLengthOverflow,
),
(&String::new(), LemmyErrorType::SiteNameRequired),
];
valid_names.iter().for_each(|valid_name| {
assert!(
site_name_length_check(valid_name).is_ok(),
"Expected {} of length {} to be Ok.",
valid_name,
valid_name.len()
)
});
invalid_names
.iter()
.for_each(|(invalid_name, expected_err)| {
let result = site_name_length_check(invalid_name);
assert!(result.is_err());
assert!(
result.unwrap_err().error_type.eq(&expected_err.clone()),
"Testing {}, expected error {}",
invalid_name,
expected_err
);
});
}
#[test]
fn test_valid_bio() {
assert!(is_valid_bio_field(&(0..BIO_MAX_LENGTH).map(|_| 'A').collect::<String>()).is_ok());
let invalid_result =
is_valid_bio_field(&(0..BIO_MAX_LENGTH + 1).map(|_| 'A').collect::<String>());
assert!(
invalid_result.is_err()
&& invalid_result
.unwrap_err()
.error_type
.eq(&LemmyErrorType::BioLengthOverflow)
);
}
#[test]
fn test_valid_site_description() {
assert!(site_description_length_check(
&(0..SITE_DESCRIPTION_MAX_LENGTH)
.map(|_| 'A')
.collect::<String>()
)
.is_ok());
let invalid_result = site_description_length_check(
&(0..SITE_DESCRIPTION_MAX_LENGTH + 1)
.map(|_| 'A')
.collect::<String>(),
);
assert!(
invalid_result.is_err()
&& invalid_result
.unwrap_err()
.error_type
.eq(&LemmyErrorType::SiteDescriptionLengthOverflow)
);
}
#[test]
fn test_valid_slur_regex() {
let valid_regexes = [&None, &Some(""), &Some("(foo|bar)")];
valid_regexes.iter().for_each(|regex| {
let result = build_and_check_regex(regex);
assert!(result.is_ok(), "Testing regex: {:?}", regex);
});
}
#[test]
fn test_too_permissive_slur_regex() {
let match_everything_regexes = [
(&Some("["), LemmyErrorType::InvalidRegex),
(&Some("(foo|bar|)"), LemmyErrorType::PermissiveRegex),
(&Some(".*"), LemmyErrorType::PermissiveRegex),
];
match_everything_regexes
.iter()
.for_each(|(regex_str, expected_err)| {
let result = build_and_check_regex(regex_str);
assert!(result.is_err());
assert!(
result.unwrap_err().error_type.eq(&expected_err.clone()),
"Testing regex {:?}, expected error {}",
regex_str,
expected_err
);
});
}
#[test]
fn test_check_site_visibility_valid() {
assert!(check_site_visibility_valid(true, true, &None, &None).is_err());
assert!(check_site_visibility_valid(true, false, &None, &Some(true)).is_err());
assert!(check_site_visibility_valid(false, true, &Some(true), &None).is_err());
assert!(check_site_visibility_valid(false, false, &Some(true), &Some(true)).is_err());
assert!(check_site_visibility_valid(true, false, &None, &None).is_ok());
assert!(check_site_visibility_valid(false, true, &None, &None).is_ok());
assert!(check_site_visibility_valid(false, false, &Some(true), &None).is_ok());
assert!(check_site_visibility_valid(false, false, &None, &Some(true)).is_ok());
}
#[test]
fn test_check_url_scheme() {
assert!(check_url_scheme(&None).is_ok());
assert!(check_url_scheme(&Some(Url::parse("http://example.com").unwrap())).is_ok());
assert!(check_url_scheme(&Some(Url::parse("https://example.com").unwrap())).is_ok());
assert!(check_url_scheme(&Some(Url::parse("https://example.com").unwrap())).is_ok());
assert!(check_url_scheme(&Some(Url::parse("ftp://example.com").unwrap())).is_err());
assert!(check_url_scheme(&Some(Url::parse("javascript:void").unwrap())).is_err());
let magnet_link="magnet:?xt=urn:btih:4b390af3891e323778959d5abfff4b726510f14c&dn=Ravel%20Complete%20Piano%20Sheet%20Music%20-%20Public%20Domain&tr=udp%3A%2F%2Fopen.tracker.cl%3A1337%2Fannounce";
assert!(check_url_scheme(&Some(Url::parse(magnet_link).unwrap())).is_ok());
}
#[test]
fn test_url_block() {
let set = regex::RegexSet::new(vec![
r"(https://)?example\.org/page/to/article",
r"(https://)?example\.net/?",
r"(https://)?example\.com/?",
])
.unwrap();
assert!(is_url_blocked(&Some(Url::parse("https://example.blog").unwrap()), &set).is_ok());
assert!(is_url_blocked(&Some(Url::parse("https://example.org").unwrap()), &set).is_ok());
assert!(is_url_blocked(&None, &set).is_ok());
assert!(is_url_blocked(&Some(Url::parse("https://example.com").unwrap()), &set).is_err());
}
#[test]
fn test_url_parsed() {
// Make sure the scheme is removed, and uniques also
assert_eq!(
&check_urls_are_valid(&vec![
"example.com".to_string(),
"http://example.com".to_string(),
"https://example.com".to_string(),
"https://example.com/test?q=test2&q2=test3#test4".to_string(),
])
.unwrap(),
&vec![
"example.com".to_string(),
"example.com/test?q=test2&q2=test3#test4".to_string()
],
);
assert!(check_urls_are_valid(&vec!["https://example .com".to_string()]).is_err());
}
}