450 lines
14 KiB
Rust
450 lines
14 KiB
Rust
use std::fs::{create_dir_all, remove_file, symlink_metadata, File};
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use std::io::prelude::*;
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use std::net::ToSocketAddrs;
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use std::time::{Duration, SystemTime};
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use rocket::http::ContentType;
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use rocket::response::Content;
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use rocket::Route;
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use reqwest::{header::HeaderMap, Client, Response, Url};
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use rocket::http::Cookie;
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use regex::Regex;
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use soup::prelude::*;
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use crate::error::Error;
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use crate::CONFIG;
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pub fn routes() -> Vec<Route> {
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routes![icon]
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}
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const FALLBACK_ICON: &[u8; 344] = include_bytes!("../static/fallback-icon.png");
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const ALLOWED_CHARS: &str = "_-.";
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lazy_static! {
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// Reuse the client between requests
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static ref CLIENT: Client = Client::builder()
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.use_sys_proxy()
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.gzip(true)
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.timeout(Duration::from_secs(CONFIG.icon_download_timeout()))
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.default_headers(_header_map())
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.build()
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.unwrap();
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}
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fn is_valid_domain(domain: &str) -> bool {
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// Don't allow empty or too big domains or path traversal
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if domain.is_empty() || domain.len() > 255 || domain.contains("..") {
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return false;
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}
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// Only alphanumeric or specific characters
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for c in domain.chars() {
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if !c.is_alphanumeric() && !ALLOWED_CHARS.contains(c) {
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return false;
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}
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}
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true
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}
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#[get("/<domain>/icon.png")]
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fn icon(domain: String) -> Content<Vec<u8>> {
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let icon_type = ContentType::new("image", "x-icon");
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if !is_valid_domain(&domain) {
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warn!("Invalid domain: {:#?}", domain);
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return Content(icon_type, FALLBACK_ICON.to_vec());
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}
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Content(icon_type, get_icon(&domain))
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}
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fn check_icon_domain_is_blacklisted(domain: &str) -> bool {
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let mut is_blacklisted = CONFIG.icon_blacklist_non_global_ips()
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&& (domain, 0)
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.to_socket_addrs()
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.map(|x| {
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for ip_port in x {
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if !ip_port.ip().is_global() {
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warn!("IP {} for domain '{}' is not a global IP!", ip_port.ip(), domain);
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return true;
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}
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}
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false
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})
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.unwrap_or(false);
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// Skip the regex check if the previous one is true already
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if !is_blacklisted {
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if let Some(blacklist) = CONFIG.icon_blacklist_regex() {
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let regex = Regex::new(&blacklist).expect("Valid Regex");
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if regex.is_match(&domain) {
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warn!("Blacklisted domain: {:#?} matched {:#?}", domain, blacklist);
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is_blacklisted = true;
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}
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}
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}
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is_blacklisted
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}
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fn get_icon(domain: &str) -> Vec<u8> {
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let path = format!("{}/{}.png", CONFIG.icon_cache_folder(), domain);
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if let Some(icon) = get_cached_icon(&path) {
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return icon;
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}
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if CONFIG.disable_icon_download() {
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return FALLBACK_ICON.to_vec();
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}
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// Get the icon, or fallback in case of error
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match download_icon(&domain) {
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Ok(icon) => {
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save_icon(&path, &icon);
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icon
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}
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Err(e) => {
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error!("Error downloading icon: {:?}", e);
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let miss_indicator = path + ".miss";
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let empty_icon = Vec::new();
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save_icon(&miss_indicator, &empty_icon);
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FALLBACK_ICON.to_vec()
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}
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}
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}
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fn get_cached_icon(path: &str) -> Option<Vec<u8>> {
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// Check for expiration of negatively cached copy
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if icon_is_negcached(path) {
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return Some(FALLBACK_ICON.to_vec());
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}
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// Check for expiration of successfully cached copy
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if icon_is_expired(path) {
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return None;
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}
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// Try to read the cached icon, and return it if it exists
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if let Ok(mut f) = File::open(path) {
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let mut buffer = Vec::new();
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if f.read_to_end(&mut buffer).is_ok() {
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return Some(buffer);
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}
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}
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None
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}
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fn file_is_expired(path: &str, ttl: u64) -> Result<bool, Error> {
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let meta = symlink_metadata(path)?;
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let modified = meta.modified()?;
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let age = SystemTime::now().duration_since(modified)?;
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Ok(ttl > 0 && ttl <= age.as_secs())
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}
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fn icon_is_negcached(path: &str) -> bool {
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let miss_indicator = path.to_owned() + ".miss";
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let expired = file_is_expired(&miss_indicator, CONFIG.icon_cache_negttl());
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match expired {
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// No longer negatively cached, drop the marker
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Ok(true) => {
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if let Err(e) = remove_file(&miss_indicator) {
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error!("Could not remove negative cache indicator for icon {:?}: {:?}", path, e);
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}
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false
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}
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// The marker hasn't expired yet.
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Ok(false) => true,
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// The marker is missing or inaccessible in some way.
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Err(_) => false,
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}
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}
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fn icon_is_expired(path: &str) -> bool {
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let expired = file_is_expired(path, CONFIG.icon_cache_ttl());
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expired.unwrap_or(true)
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}
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#[derive(Debug)]
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struct Icon {
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priority: u8,
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href: String,
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}
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impl Icon {
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fn new(priority: u8, href: String) -> Self {
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Self { href, priority }
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}
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}
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/// Returns a Result/Tuple which holds a Vector IconList and a string which holds the cookies from the last response.
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/// There will always be a result with a string which will contain https://example.com/favicon.ico and an empty string for the cookies.
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/// This does not mean that that location does exists, but it is the default location browser use.
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///
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/// # Argument
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/// * `domain` - A string which holds the domain with extension.
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///
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/// # Example
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/// ```
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/// let (mut iconlist, cookie_str) = get_icon_url("github.com")?;
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/// let (mut iconlist, cookie_str) = get_icon_url("gitlab.com")?;
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/// ```
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fn get_icon_url(domain: &str) -> Result<(Vec<Icon>, String), Error> {
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// Default URL with secure and insecure schemes
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let ssldomain = format!("https://{}", domain);
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let httpdomain = format!("http://{}", domain);
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// Create the iconlist
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let mut iconlist: Vec<Icon> = Vec::new();
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// Create the cookie_str to fill it all the cookies from the response
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// These cookies can be used to request/download the favicon image.
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// Some sites have extra security in place with for example XSRF Tokens.
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let mut cookie_str = String::new();
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let resp = get_page(&ssldomain).or_else(|_| get_page(&httpdomain));
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if let Ok(mut content) = resp {
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// Extract the URL from the respose in case redirects occured (like @ gitlab.com)
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let url = content.url().clone();
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let raw_cookies = content.headers().get_all("set-cookie");
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cookie_str = raw_cookies
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.iter()
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.filter_map(|raw_cookie| raw_cookie.to_str().ok())
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.map(|cookie_str| {
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if let Ok(cookie) = Cookie::parse(cookie_str) {
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format!("{}={}; ", cookie.name(), cookie.value())
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} else {
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String::new()
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}
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})
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.collect::<String>();
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// Add the default favicon.ico to the list with the domain the content responded from.
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iconlist.push(Icon::new(35, url.join("/favicon.ico").unwrap().into_string()));
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// 512KB should be more than enough for the HTML, though as we only really need
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// the HTML header, it could potentially be reduced even further
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let limited_reader = crate::util::LimitedReader::new(&mut content, 512 * 1024);
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let soup = Soup::from_reader(limited_reader)?;
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// Search for and filter
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let favicons = soup
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.tag("link")
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.attr("rel", Regex::new(r"icon$|apple.*icon")?) // Only use icon rels
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.attr("href", Regex::new(r"(?i)\w+\.(jpg|jpeg|png|ico)(\?.*)?$|^data:image.*base64")?) // Only allow specific extensions
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.find_all();
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// Loop through all the found icons and determine it's priority
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for favicon in favicons {
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let sizes = favicon.get("sizes");
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let href = favicon.get("href").expect("Missing href");
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let full_href = url.join(&href).unwrap().into_string();
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let priority = get_icon_priority(&full_href, sizes);
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iconlist.push(Icon::new(priority, full_href))
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}
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} else {
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// Add the default favicon.ico to the list with just the given domain
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iconlist.push(Icon::new(35, format!("{}/favicon.ico", ssldomain)));
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iconlist.push(Icon::new(35, format!("{}/favicon.ico", httpdomain)));
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}
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// Sort the iconlist by priority
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iconlist.sort_by_key(|x| x.priority);
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// There always is an icon in the list, so no need to check if it exists, and just return the first one
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Ok((iconlist, cookie_str))
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}
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fn get_page(url: &str) -> Result<Response, Error> {
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get_page_with_cookies(url, "")
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}
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fn get_page_with_cookies(url: &str, cookie_str: &str) -> Result<Response, Error> {
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if check_icon_domain_is_blacklisted(Url::parse(url).unwrap().host_str().unwrap_or_default()) {
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err!("Favicon rel linked to a non blacklisted domain!");
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}
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if cookie_str.is_empty() {
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CLIENT.get(url).send()?.error_for_status().map_err(Into::into)
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} else {
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CLIENT
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.get(url)
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.header("cookie", cookie_str)
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.send()?
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.error_for_status()
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.map_err(Into::into)
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}
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}
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/// Returns a Integer with the priority of the type of the icon which to prefer.
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/// The lower the number the better.
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///
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/// # Arguments
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/// * `href` - A string which holds the href value or relative path.
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/// * `sizes` - The size of the icon if available as a <width>x<height> value like 32x32.
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///
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/// # Example
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/// ```
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/// priority1 = get_icon_priority("http://example.com/path/to/a/favicon.png", "32x32");
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/// priority2 = get_icon_priority("https://example.com/path/to/a/favicon.ico", "");
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/// ```
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fn get_icon_priority(href: &str, sizes: Option<String>) -> u8 {
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// Check if there is a dimension set
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let (width, height) = parse_sizes(sizes);
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// Check if there is a size given
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if width != 0 && height != 0 {
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// Only allow square dimensions
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if width == height {
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// Change priority by given size
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if width == 32 {
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1
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} else if width == 64 {
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2
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} else if width >= 24 && width <= 128 {
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3
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} else if width == 16 {
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4
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} else {
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5
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}
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// There are dimensions available, but the image is not a square
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} else {
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200
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}
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} else {
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// Change priority by file extension
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if href.ends_with(".png") {
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10
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} else if href.ends_with(".jpg") || href.ends_with(".jpeg") {
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20
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} else {
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30
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}
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}
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}
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/// Returns a Tuple with the width and hight as a seperate value extracted from the sizes attribute
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/// It will return 0 for both values if no match has been found.
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///
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/// # Arguments
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/// * `sizes` - The size of the icon if available as a <width>x<height> value like 32x32.
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///
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/// # Example
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/// ```
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/// let (width, height) = parse_sizes("64x64"); // (64, 64)
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/// let (width, height) = parse_sizes("x128x128"); // (128, 128)
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/// let (width, height) = parse_sizes("32"); // (0, 0)
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/// ```
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fn parse_sizes(sizes: Option<String>) -> (u16, u16) {
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let mut width: u16 = 0;
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let mut height: u16 = 0;
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if let Some(sizes) = sizes {
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match Regex::new(r"(?x)(\d+)\D*(\d+)").unwrap().captures(sizes.trim()) {
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None => {}
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Some(dimensions) => {
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if dimensions.len() >= 3 {
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width = dimensions[1].parse::<u16>().unwrap_or_default();
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height = dimensions[2].parse::<u16>().unwrap_or_default();
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}
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}
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}
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}
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(width, height)
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}
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fn download_icon(domain: &str) -> Result<Vec<u8>, Error> {
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if check_icon_domain_is_blacklisted(domain) {
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err!("Domain is blacklisted", domain)
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}
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let (iconlist, cookie_str) = get_icon_url(&domain)?;
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let mut buffer = Vec::new();
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use data_url::DataUrl;
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for icon in iconlist.iter().take(5) {
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if icon.href.starts_with("data:image") {
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let datauri = DataUrl::process(&icon.href).unwrap();
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// Check if we are able to decode the data uri
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match datauri.decode_to_vec() {
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Ok((body, _fragment)) => {
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// Also check if the size is atleast 67 bytes, which seems to be the smallest png i could create
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if body.len() >= 67 {
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buffer = body;
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break;
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}
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}
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_ => warn!("data uri is invalid"),
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};
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} else {
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match get_page_with_cookies(&icon.href, &cookie_str) {
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Ok(mut res) => {
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info!("Downloaded icon from {}", icon.href);
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res.copy_to(&mut buffer)?;
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break;
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}
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Err(_) => info!("Download failed for {}", icon.href),
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};
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}
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}
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if buffer.is_empty() {
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err!("Empty response")
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}
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Ok(buffer)
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}
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fn save_icon(path: &str, icon: &[u8]) {
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match File::create(path) {
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Ok(mut f) => {
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f.write_all(icon).expect("Error writing icon file");
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}
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Err(ref e) if e.kind() == std::io::ErrorKind::NotFound => {
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create_dir_all(&CONFIG.icon_cache_folder()).expect("Error creating icon cache");
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}
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Err(e) => {
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info!("Icon save error: {:?}", e);
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}
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}
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}
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fn _header_map() -> HeaderMap {
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// Set some default headers for the request.
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// Use a browser like user-agent to make sure most websites will return there correct website.
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use reqwest::header::*;
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macro_rules! headers {
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($( $name:ident : $value:literal),+ $(,)? ) => {
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let mut headers = HeaderMap::new();
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$( headers.insert($name, HeaderValue::from_static($value)); )+
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headers
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};
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}
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headers! {
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USER_AGENT: "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36 Edge/16.16299",
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ACCEPT_LANGUAGE: "en-US,en;q=0.8",
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CACHE_CONTROL: "no-cache",
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PRAGMA: "no-cache",
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ACCEPT: "text/html,application/xhtml+xml,application/xml; q=0.9,image/webp,image/apng,*/*;q=0.8",
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}
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}
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