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Fix icon redirect caching (#6487)

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As reported in #6477, redirection of favicon's didn't allowed caching.
This commit fixes this by adding the `Cached` wrapper around the response.
It will use the same TTL's used for downloading icon's locally.

Also removed `_` as valid domain character, these should not be used in FQDN's at all.
Those only serve as special chars used in domain labels, mostly used in SRV or TXT records.

Fixes #6477

Signed-off-by: BlackDex <black.dex@gmail.com>
This commit is contained in:
Mathijs van Veluw
2025-11-23 21:50:31 +01:00
committed by GitHub
parent bb41f64c0a
commit 7f7b412220
1 changed files with 7 additions and 6 deletions
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13
src/api/icons.rs
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@@ -82,19 +82,19 @@ static ICON_SIZE_REGEX: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"(?x)(\d+
// It is used to prevent sending a specific header which breaks icon downloads.
// If this function needs to be renamed, also adjust the code in `util.rs`
#[get("/<domain>/icon.png")]
fn icon_external(domain: &str) -> Option<Redirect> {
fn icon_external(domain: &str) -> Cached<Option<Redirect>> {
if !is_valid_domain(domain) {
warn!("Invalid domain: {domain}");
return None;
return Cached::ttl(None, CONFIG.icon_cache_negttl(), true);
}
if should_block_address(domain) {
warn!("Blocked address: {domain}");
return None;
return Cached::ttl(None, CONFIG.icon_cache_negttl(), true);
}
let url = CONFIG._icon_service_url().replace("{}", domain);
match CONFIG.icon_redirect_code() {
let redir = match CONFIG.icon_redirect_code() {
301 => Some(Redirect::moved(url)), // legacy permanent redirect
302 => Some(Redirect::found(url)), // legacy temporary redirect
307 => Some(Redirect::temporary(url)),
@@ -103,7 +103,8 @@ fn icon_external(domain: &str) -> Option<Redirect> {
error!("Unexpected redirect code {}", CONFIG.icon_redirect_code());
None
}
}
};
Cached::ttl(redir, CONFIG.icon_cache_ttl(), true)
}
#[get("/<domain>/icon.png")]
@@ -141,7 +142,7 @@ async fn icon_internal(domain: &str) -> Cached<(ContentType, Vec<u8>)> {
/// This does some manual checks and makes use of Url to do some basic checking.
/// domains can't be larger then 63 characters (not counting multiple subdomains) according to the RFC's, but we limit the total size to 255.
fn is_valid_domain(domain: &str) -> bool {
const ALLOWED_CHARS: &str = "_-.";
const ALLOWED_CHARS: &str = "-.";
// If parsing the domain fails using Url, it will not work with reqwest.
if let Err(parse_error) = url::Url::parse(format!("https://{domain}").as_str()) {