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chore: dedupe is_unique_violation, lift SQL into repo, centralise URL parsing

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Three layering cleanups from REVIEW.md §5 / §3:

- Drop the three private `is_unique_violation` helpers in
  repo::{user,chapter,bookmark} in favour of sqlx 0.8's
  `DatabaseError::is_unique_violation()` method (already used by
  repo::collection).
- Remove the unreachable 23505 branch in repo::chapter::create — the
  (manga_id, number) UNIQUE was dropped in 0013, so the defensive arm
  could no longer fire. A doc note records what to do if uniqueness
  is re-added.
- Move three inline SQL queries out of handlers/daemon into repo
  functions: bookmarks' chapter-belongs-to-manga guard
  (`repo::chapter::belongs_to_manga`), the daemon's dispatch lookup
  (`repo::chapter::dispatch_target`), and the daemon's page_count
  safety net (`repo::chapter::page_count`). Restores the
  handlers→repo layering invariant in CLAUDE.md.
- New `crawler::url_utils` module consolidates host_of / origin_of /
  registrable_domain — they used to live in three crawler submodules
  with diverging edge-case behaviour. Tests moved with them.
- Doc cross-references on repo::author::set_for_manga and
  repo::genre::set_for_manga pointing to the crawler's name-keyed
  variants, so the intentional duplication is discoverable.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
MechaCat02
2026-05-28 19:31:49 +02:00
parent bd9a6bd257
commit c320eda7cd
13 changed files with 282 additions and 149 deletions
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194
backend/src/crawler/url_utils.rs Normal file
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//! Centralised URL helpers for the crawler subsystem.
//!
//! Three near-identical hand-rolled URL parsers used to live in
//! `crawler::session`, `crawler::rate_limit`, and `crawler::pipeline`
//! respectively, each with subtly different edge-case behaviour
//! around port handling and IPv6 literals. They're consolidated here
//! so the divergence can't drift again.
//!
//! The hand-rolled implementations are kept intentionally — they
//! preserve the exact semantics every existing test pins. A future
//! refactor can switch to `reqwest::Url` if it can be done without
//! changing those semantics.
/// Lowercased host (no port). Returns `None` for inputs without a
/// `scheme://host` shape — those would never have reached the network
/// layer anyway. Used by the per-host rate limiter as its bucket key.
///
/// IPv6 literals are kept in their `[::1]` bracketed form so the
/// `rsplit_once(':')` port-stripping logic doesn't split inside the
/// address (e.g. `https://[::1]/foo` used to return `"[:"` because
/// the rightmost `:` is inside the literal). Buckets keyed by
/// `[::1]` vs `::1` are still uniquely-per-host; the brackets are
/// cosmetic.
pub fn host_of(url: &str) -> Option<String> {
let after_scheme = url.split_once("://")?.1;
let host_with_port = after_scheme.split('/').next()?;
let host = if host_with_port.starts_with('[') {
// IPv6 literal: keep through the closing bracket. There may
// be a trailing `:port` after `]`; strip only that.
match host_with_port.rfind(']') {
Some(end) => &host_with_port[..=end],
None => host_with_port,
}
} else {
// Hostnames and IPv4 literals: trailing `:port` (if any) is
// after the last `:`.
host_with_port
.rsplit_once(':')
.map_or(host_with_port, |(h, _)| h)
};
(!host.is_empty()).then(|| host.to_ascii_lowercase())
}
/// `scheme://host` with no path or port stripping. Used by the metadata
/// pass to seed `sources.base_url` from `CRAWLER_START_URL`.
pub fn origin_of(url: &str) -> Option<String> {
let (scheme, rest) = url.split_once("://")?;
let host = rest.split('/').next()?;
Some(format!("{scheme}://{host}"))
}
/// Approximate registrable-domain calculation: take the last two
/// dot-labels of the host, prefix with `.`. Used to set a parent-
/// domain cookie so the catalog's `www.` / `m.` redirects don't drop
/// the cookie mid-crawl.
///
/// Caveat: wrong for multi-part TLDs (`.co.uk`, `.com.br`). The
/// operator can override via `CRAWLER_COOKIE_DOMAIN`; pulling in the
/// Public Suffix List for one knob isn't worth it yet.
///
/// Bare hostnames (e.g. `localhost`) return the host as-is, with no
/// leading dot — setting `.localhost` as a cookie domain is invalid.
/// IPv6 literals (e.g. `[::1]`) are returned bracketed and unchanged;
/// the browser will reject them as a cookie `Domain` anyway, but the
/// representation stays sensible. Same `starts_with('[')` branch as
/// [`host_of`] for consistent IPv6 handling across the module.
pub fn registrable_domain(url: &str) -> Option<String> {
let after_scheme = url.split_once("://")?.1;
let host_with_port = after_scheme.split('/').next()?;
let host_str = if host_with_port.starts_with('[') {
// IPv6 literal: keep through the closing bracket; an optional
// `:port` follows `]`.
match host_with_port.rfind(']') {
Some(end) => &host_with_port[..=end],
None => host_with_port,
}
} else {
host_with_port
.rsplit_once(':')
.map_or(host_with_port, |(h, _)| h)
};
let host = host_str.to_ascii_lowercase();
if host.is_empty() {
return None;
}
let labels: Vec<&str> = host.split('.').filter(|l| !l.is_empty()).collect();
if labels.len() < 2 {
return Some(host);
}
let registrable = &labels[labels.len() - 2..];
Some(format!(".{}", registrable.join(".")))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn host_of_strips_port_and_lowercases() {
assert_eq!(
host_of("https://CDN.Example.com:443/x").as_deref(),
Some("cdn.example.com")
);
assert_eq!(host_of("http://localhost/").as_deref(), Some("localhost"));
assert_eq!(host_of("not a url"), None);
}
#[test]
fn host_of_keeps_bracketed_ipv6_literal_intact() {
// Regression: the old impl rsplit_once(':')'d the IPv6 address,
// returning "[:" instead of "[::1]". A real IPv6 source would
// silently get a wrong rate-limit bucket key.
assert_eq!(host_of("https://[::1]/").as_deref(), Some("[::1]"));
assert_eq!(host_of("https://[::1]:8080/").as_deref(), Some("[::1]"));
assert_eq!(
host_of("https://[2001:db8::1]/foo").as_deref(),
Some("[2001:db8::1]")
);
assert_eq!(
host_of("https://[2001:db8::1]:443/foo").as_deref(),
Some("[2001:db8::1]")
);
}
#[test]
fn origin_of_returns_scheme_and_host() {
assert_eq!(
origin_of("https://example.com/some/path?q=1").as_deref(),
Some("https://example.com")
);
assert_eq!(origin_of("garbage"), None);
}
#[test]
fn registrable_domain_strips_subdomain() {
assert_eq!(
registrable_domain("https://www.target-site.com/manga/foo/").as_deref(),
Some(".target-site.com")
);
assert_eq!(
registrable_domain("https://m.example.org").as_deref(),
Some(".example.org")
);
}
#[test]
fn registrable_domain_keeps_two_label_host() {
assert_eq!(
registrable_domain("https://example.com/").as_deref(),
Some(".example.com")
);
}
#[test]
fn registrable_domain_handles_port() {
assert_eq!(
registrable_domain("http://www.foo.bar:8080/x").as_deref(),
Some(".foo.bar")
);
}
#[test]
fn registrable_domain_bare_hostname_no_leading_dot() {
assert_eq!(
registrable_domain("http://localhost:5173").as_deref(),
Some("localhost")
);
}
#[test]
fn registrable_domain_returns_none_for_garbage() {
assert!(registrable_domain("not a url").is_none());
}
#[test]
fn registrable_domain_keeps_bracketed_ipv6_literal_intact() {
// Symmetric with host_of's IPv6 fix. The cookie-domain code
// won't accept an IP as a `Domain` value, but the function
// should at least return a sensible representation rather
// than the truncated `"[:"` the old port-stripper produced.
assert_eq!(
registrable_domain("https://[::1]/").as_deref(),
Some("[::1]")
);
assert_eq!(
registrable_domain("https://[::1]:8080/").as_deref(),
Some("[::1]")
);
assert_eq!(
registrable_domain("https://[2001:db8::1]/foo").as_deref(),
Some("[2001:db8::1]")
);
}
}