110 lines
4.4 KiB
Go
110 lines
4.4 KiB
Go
package latest
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import (
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"regexp"
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"strconv"
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"strings"
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"mangabm/backend/internal/store"
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)
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// latestChapter is the newest chapter a series page advertises.
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type latestChapter struct {
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Num float64
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Label string
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}
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// asuraSlugRe pulls the series slug out of a stored series_url.
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// Shape verified live 2026-07-26: https://asurascans.com/comics/<slug>, where
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// the slug carries a trailing build-hash suffix (e.g. "-f886a8af") that
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// rotates on every site redeploy — callers must strip it (asuraBuildHash)
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// before using the slug to scope anything.
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var asuraSlugRe = regexp.MustCompile(`/comics/([^/?#]+)`)
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// demonicChapterRe matches the pre-redirect anchors demonic series pages link
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// through. Both the raw "&" and the HTML-escaped "&" forms occur.
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var demonicChapterRe = regexp.MustCompile(`chaptered\.php\?manga=\d+&(?:amp;)?chapter=([0-9.]+)`)
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// comixSlugRe pulls the "<id>-<slug>" segment out of a stored series_url.
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// Only the id prefix is stable; the slug tail follows the title.
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var comixSlugRe = regexp.MustCompile(`/title/([^/?#]+)`)
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// kaganeChapterRe matches the chapter numbers in a kagane API response. This
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// branch is fed by the browser fetcher, so the body is JSON rather than HTML —
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// there are no anchors to scan.
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var kaganeChapterRe = regexp.MustCompile(`"chapter_no":"([0-9.]+)"`)
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// latestChapterFrom returns the highest chapter number body advertises for this
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// series. ok is false when the body yields nothing usable — an unknown site, an
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// empty body, a Cloudflare challenge page, and a site redesign all land here,
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// and the caller treats all four identically.
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//
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// Ported from the userscript's latestChapterFromAnchors (asura L123-133,
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// demonic L183-193), including its reason for taking a maximum rather than a
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// first or last: neither site lists chapters in a dependable order.
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//
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// The userscript's asura rule additionally requires the anchor text to match
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// /Chapter\s+[\d.]+/i. That check exists only to skip the "First Chapter"
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// shortcut, which points at chapter/1 and therefore can never win a maximum, so
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// it is redundant here. For asura, scoping the pattern to this series' own slug
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// replaces it with a stronger guarantee: a chapter link belonging to some other
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// series cannot contribute even if the page starts carrying them. demonic has no
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// such guarantee — demonicChapterRe matches any chaptered.php?manga=<id> anchor
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// with no per-series scoping, because the stored series_id for demonic is a
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// slug, not the numeric id the URL carries, so it cannot easily be scoped.
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func latestChapterFrom(site, seriesURL, body string) (latestChapter, bool) {
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var re *regexp.Regexp
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switch site {
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case "asura":
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m := asuraSlugRe.FindStringSubmatch(seriesURL)
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if m == nil {
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return latestChapter{}, false
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}
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// Stored URLs predating a redeploy may carry a stale build hash;
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// chapter hrefs in the fetched body carry the current one. Strip to
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// the stable ID (same rule as migrateAsuraKeys) and make the hash
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// optional in the pattern, so scoping survives rotations.
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slug := store.AsuraBuildHash.ReplaceAllString(m[1], "")
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// Compiled per call rather than cached: this runs once per fetch, which
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// is at most a few times a minute, and the slug varies per series.
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re = regexp.MustCompile(`/comics/` + regexp.QuoteMeta(slug) + `(?:-[0-9a-f]{8})?/chapter/([0-9.]+)`)
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case "demonic":
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re = demonicChapterRe
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case "comix":
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m := comixSlugRe.FindStringSubmatch(seriesURL)
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if m == nil {
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return latestChapter{}, false
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}
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// comix ships an SPA: the served HTML carries a JSON state blob instead
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// of chapter anchors, and latestChapterUrl is the only place the newest
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// chapter appears. Scoping to this series' id prefix keeps a
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// "recommended" strip's entries from winning the maximum.
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id := m[1]
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if i := strings.Index(id, "-"); i != -1 {
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id = id[:i]
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}
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re = regexp.MustCompile(`"latestChapterUrl":"/title/` + regexp.QuoteMeta(id) + `-[^"]*-chapter-([0-9.]+)"`)
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case "kagane":
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re = kaganeChapterRe
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default:
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return latestChapter{}, false
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}
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var best latestChapter
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found := false
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for _, m := range re.FindAllStringSubmatch(body, -1) {
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// [0-9.]+ can swallow a trailing separator, e.g. "chapter/12." in a
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// sentence; ParseFloat would reject the whole match.
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raw := strings.Trim(m[1], ".")
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num, err := strconv.ParseFloat(raw, 64)
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if err != nil {
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continue
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}
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if !found || num > best.Num {
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best = latestChapter{Num: num, Label: "Chapter " + raw}
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found = true
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}
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}
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return best, found
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}
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