Unify page routing and harden acquire wiring after review (#62)

backend/internal/latest/acquire.go

@@ -3,7 +3,6 @@ package latest
 import (
 	"context"
 	"log"
-	"slices"
 	"sync"
 	"time"
 
@@ -36,11 +35,9 @@ type Acquirer struct {
 	// BrowserFetch disables acquisition entirely.
 	Fetch Fetcher
 	// BrowserFetch retrieves kagane and novelfull pages through the browser
-	// sidecar, which is the only thing that clears their Cloudflare
-	// challenge. Nil leaves those Sites unacquired; kagane never falls back
-	// to Fetch (a plain request only retrieves a challenge page), while
-	// novelfull does, because its challenge is a live time-varying fact and
-	// its cover bytes never need the browser.
+	// sidecar, the only thing that clears their Cloudflare challenge. The
+	// per-site fallback policy lives in fetcherFor. Nil leaves those Sites
+	// unacquired when no fallback applies.
 	BrowserFetch Fetcher
 	// Covers retrieves the cover bytes. Nil leaves the Cover blank and the
 	// chapter half working.
@@ -108,7 +105,7 @@ func (a *Acquirer) acquire(ctx context.Context, sr store.Series) {
 		return
 	}
 
-	f := a.fetcherFor(sr.Site)
+	f := fetcherFor(sr.Site, a.BrowserFetch, a.Fetch)
 	if f == nil {
 		log.Printf("acquire %q: no fetcher for site %q", sr.Key(), sr.Site)
 		return
@@ -148,24 +145,3 @@ func (a *Acquirer) acquire(ctx context.Context, sr store.Series) {
 		log.Printf("acquire %q: persist cover: %v", sr.Key(), err)
 	}
 }
-
-// fetcherFor returns the fetcher a site's page needs, or nil when the site
-// cannot be fetched at all right now. kagane and novelfull pages sit behind a
-// Cloudflare JavaScript challenge, so they prefer the browser; novelfull alone
-// falls back to the plain-TLS fetcher when no browser is configured, because
-// its challenge is a live time-varying fact (AGENTS.md) and its cover bytes
-// never need the browser. kagane never falls back: a plain fetch of a kagane
-// page or cover would only ever retrieve a challenge page.
-func (a *Acquirer) fetcherFor(site string) Fetcher {
-	switch {
-	case site == "kagane":
-		return a.BrowserFetch
-	case slices.Contains(browserBackedSites, site): // novelfull
-		if a.BrowserFetch != nil {
-			return a.BrowserFetch
-		}
-		return a.Fetch
-	default:
-		return a.Fetch
-	}
-}