Browser-backed Sites join the Cover pipeline (#62)

backend/internal/latest/poller.go

@@ -2,7 +2,6 @@ package latest
 
 import (
 	"context"
-	"errors"
 	"log"
 	"net/url"
 	"slices"
@@ -107,7 +106,7 @@ func (p *Poller) prefetchCover(ctx context.Context, sr store.Series) {
 // failure is logged against the Series and swallowed so the chapter poll
 // cannot see it.
 func (p *Poller) storeCover(ctx context.Context, sr store.Series, sourceURL string) {
-	bytes, contentType, err := p.fetchCoverBytes(ctx, sr, sourceURL)
+	bytes, contentType, err := fetchCoverBytes(ctx, sr.Site, sourceURL, p.CoverFetch, p.CoverBytesFetch)
 	if err != nil {
 		log.Printf("latest poll %q: fetch cover %s: %v", sr.Key(), sourceURL, err)
 		return
@@ -117,26 +116,6 @@ func (p *Poller) storeCover(ctx context.Context, sr store.Series, sourceURL stri
 	}
 }
 
-// fetchCoverBytes routes by Site: only kagane needs the browser for image
-// bytes; every other Site's CDN answers plain TLS. Missing fetchers degrade to
-// a blank Cover rather than falling back onto a path that cannot succeed.
-func (p *Poller) fetchCoverBytes(ctx context.Context, sr store.Series, cover string) ([]byte, string, error) {
-	if sr.Site == "kagane" {
-		if p.CoverFetch == nil {
-			return nil, "", errors.New("no cover fetcher")
-		}
-		imageID, ok := store.KaganeImageID(cover)
-		if !ok {
-			return nil, "", errors.New("invalid kagane cover URL")
-		}
-		return p.CoverFetch.Image(ctx, imageID)
-	}
-	if p.CoverBytesFetch == nil {
-		return nil, "", errors.New("no cover fetcher")
-	}
-	return p.CoverBytesFetch.Fetch(ctx, cover)
-}
-
 // fetcherFor returns the fetcher a site needs, or nil when the site cannot be
 // fetched at all right now. kagane and novelfull both sit behind a Cloudflare
 // JavaScript challenge that no TLS fingerprint clears — kagane verified