Delete the kagane-specific cover path (#63) (#73)

Closes #63 Deletes the second way to reach a Cover. Since #62, every Site's cover bytes land in the content-addressed store at creation or on the poll, and the one public route serves them all — nothing needs the kagane proxy anymore. ## What went - **Template-level rewrite:** `Bookmark.CoverURL()` and both templates' use of it. Cards and chrome now render `.Cover` — the wire value — and nothing else. `Bookmark.CoverSource` was dead once `CoverURL` went, so it and its `bookmarkColumns` entry are gone too. - **Kagane-only cover route and its identifier validation:** `GET /img/kagane/{id}`, `web.CoverFetcher`, `coverIDRe`, and the whole `internal/web/cover.go`. - **The proxy's persistence:** `store.KaganeImageID`, `GetKaganeCover`, `PutKaganeCover`, `kaganeCoverSourceURL`, `kaganeCoverRe`. - **The kagane-shaped branch in the byte-fetch routing:** `fetchCoverBytes` no longer takes a `site` argument and no longer names a Site. The URL shape kagane's API publishes is claimed by the browser module itself — `kaganeImageURLRe` + `browserCoverURL` live in `latest/browser.go` with the rest of the per-Site knowledge — and `BrowserFetcher.Image` is now URL-driven (it validates the URL it will navigate to, same SSRF discipline as before). The no-plain-TLS-fallback rule for a claimed URL is preserved: a claimed address with no browser is an error, never a challenge-page fetch. ## What stayed (deliberately) - `BrowserFetcher.Image` and the browser-backed acquisition path: kagane genuinely serves cover bytes behind the challenge + `cross-origin-resource-policy: same-origin`, so the sidecar remains the only fetcher for them — it just routes by URL claim now instead of by Site name. - `fetcherFor`'s per-Site page routing (kagane/novelfull page fetches) — that is the page path, not a cover path. ## Acceptance criteria - [x] Template-level kagane cover rewrite gone - [x] Kagane-only cover route and its identifier validation gone - [x] Tests removed/rewritten against the general route, guarantees kept: unstored + traversal-shaped addresses serve nothing (`TestPublicCoverRejectsUnknownAddress`), non-image content types never echoed (`TestPublicCoverNeverEchoesNonImage` — new; the store-side gate was already pinned by `TestCoverStoreAcceptsAnySourceURL`). Store reopen-persistence and filesystem content-addressing tests rewritten against `PutCover`/`GetCover`, no guarantee lost. - [x] No Site name in a cover code path outside the acquisition module (`grep kagane backend`: store/web/templates/api are clean; remaining hits are `latest/browser.go` + `latest/sites.go`, tests, docs) - [x] Web UI and panel render Covers for all six Sites (templates render the wire address; panel renders `b.cover` — untouched, it never had a kagane path) - [x] `go test ./...` green ## Verification - `go vet ./...` clean - `go test ./...` — all packages pass (root 16.9s, latest 12.7s, store 12.7s, web 0.004s) - `CGO_ENABLED=0 go build` produces the static binary - Cover-path tests run verbosely: `TestPublicCoverServesStoredBytesUnauthenticated`, `TestPublicCoverRejectsUnknownAddress` (unknown/malformed/traversal/empty), `TestPublicCoverNeverEchoesNonImage`, `TestListRendersAcquiredCover`, `TestAcquireKaganeCoverThroughBrowser`, `TestRunOncePrefetchesKaganeCover`, `TestRunOnceRoutesNonKaganeCoverToPublicFetcher` all pass; the three `SMOKE_*` tests skip without the browser sidecar, as designed Live browser verification of the "web UI and panel render Covers for all six Sites" criterion is being run separately with Playwright against real Site pages and a locally mocked backend. Reviewed-on: #73 Co-authored-by: Sulthan Zaki <sultankiki05@gmail.com> Co-committed-by: Sulthan Zaki <sultankiki05@gmail.com>
2026-08-10 18:02:47 +07:00
parent 78234f3c19
commit 7c7d597019
18 changed files with 157 additions and 484 deletions
@@ -150,6 +150,14 @@ func (h *Handler) Cover(w http.ResponseWriter, r *http.Request) {
 		http.NotFound(w, r)
 		return
 	}
+	// Refuse anything the write gate would not have recorded: a poisoned row
+	// (migrated data, a writer that skips the gate) must never be echoed back
+	// as bytes of a type no Cover may have.
+	if _, ok := store.CoverContentType(contentType); !ok {
+		log.Printf("cover %s: refusing non-image content type %q", r.PathValue("address"), contentType)
+		http.NotFound(w, r)
+		return
+	}
 	w.Header().Set("Content-Type", contentType)
 	// Content-addressed, so the bytes at this URL can never change. Public
 	// rather than private: no credential gates the route.
@@ -42,8 +42,8 @@ type Acquirer struct {
 	// Covers retrieves the cover bytes. Nil leaves the Cover blank and the
 	// chapter half working.
 	Covers CoverBytesFetcher
-	// BrowserCoverFetch retrieves kagane cover bytes through the browser
-	// sidecar. Nil leaves kagane Covers blank; nothing falls back to a plain
+	// BrowserCoverFetch retrieves browser-claimed cover bytes through the
+	// sidecar. Nil leaves those Covers blank; nothing falls back to a plain
 	// fetch, which would only ever retrieve a challenge page.
 	BrowserCoverFetch BrowserCoverFetcher
 	// Ctx cancels in-flight acquisitions at shutdown. A hook signature has
@@ -136,7 +136,7 @@ func (a *Acquirer) acquire(ctx context.Context, sr store.Series) {
 	if !ok {
 		return
 	}
-	bytes, contentType, err := fetchCoverBytes(ctx, sr.Site, cover, a.BrowserCoverFetch, a.Covers)
+	bytes, contentType, err := fetchCoverBytes(ctx, cover, a.BrowserCoverFetch, a.Covers)
 	if err != nil {
 		log.Printf("acquire %q: fetch cover %s: %v", sr.Key(), cover, err)
 		return
@@ -312,8 +312,8 @@ func TestAcquireKaganeCoverThroughBrowser(t *testing.T) {
 	if got := covers.callCount(); got != 1 {
 		t.Fatalf("browser cover fetches = %d, want 1", got)
 	}
-	if got := covers.calls[0]; got != kaganeImageID {
-		t.Fatalf("browser cover fetched image id %q, want %q", got, kaganeImageID)
+	if got := covers.calls[0]; got != kaganeCoverSrc {
+		t.Fatalf("browser cover fetched URL %q, want %q", got, kaganeCoverSrc)
 	}
 	got := readBookmark(t, s, kaganeKey)
 	if want := testCoverBaseURL + "/covers/" + store.CoverAddress(kaganeCoverSrc); got.Cover != want {
@@ -24,12 +24,6 @@ const challengeTimeout = 45 * time.Second

 var kaganeSeriesRe = regexp.MustCompile(`^/series/([0-9a-f-]{36})/?$`)

-// kaganeImageIDRe pins the only path segment Image interpolates into an
-// outbound URL. The id arrives from a stored cover URL, which a client
-// supplied, so it is matched rather than trusted: a headless browser is a
-// strong SSRF primitive.
-var kaganeImageIDRe = regexp.MustCompile(`^[0-9a-f-]{36}$`)
-
 // BrowserFetcher retrieves pages through a remote headless Chrome over the
 // DevTools Protocol.
 //
@@ -134,12 +128,14 @@ func (f *BrowserFetcher) Get(ctx context.Context, seriesURL string) (string, int
 	return body, 200, nil
 }

-// Image retrieves one kagane cover as raw bytes and its content type.
+// Image retrieves one cover's bytes through the browser sidecar, and its
+// content type.
 //
 // It exists because kagane serves covers behind the same challenge as its
-// pages *and* with `cross-origin-resource-policy: same-origin`, so an <img> on
-// the web UI's origin cannot load one even from a browser that already holds
-// the clearance cookie (verified 2026-08-08). Proxying is the only route.
+// pages *and* with `cross-origin-resource-policy: same-origin`, so the bytes
+// are only reachable from inside a browser that already holds the clearance
+// cookie (verified 2026-08-08). Acquisition through the sidecar is the only
+// route.
 //
 // The image URL is navigated to rather than fetched from some other kagane
 // page: the challenge only runs on a top-level navigation, and once it clears
@@ -149,12 +145,14 @@ func (f *BrowserFetcher) Get(ctx context.Context, seriesURL string) (string, int
 // The challenge is not solved by the first read: WaitReady("body") is satisfied
 // by the interstitial too. run holds the tab open until the in-page fetch
 // succeeds, which is what gives the challenge script the seconds it needs.
-func (f *BrowserFetcher) Image(ctx context.Context, imageID string) ([]byte, string, error) {
-	if !kaganeImageIDRe.MatchString(imageID) {
-		return nil, "", fmt.Errorf("not a kagane image id: %q", imageID)
+func (f *BrowserFetcher) Image(ctx context.Context, imageURL string) ([]byte, string, error) {
+	m := kaganeImageURLRe.FindStringSubmatch(imageURL)
+	if m == nil {
+		return nil, "", fmt.Errorf("not a browser-fetchable cover url: %q", imageURL)
 	}
+	imageID := m[1]
 	var dataURL string
-	err := f.run(ctx, "https://kagane.to/api/v2/image/"+imageID+"/compressed",
+	err := f.run(ctx, imageURL,
 		chromedp.Evaluate(`fetch(location.href).then(r => r.ok
 			? r.blob().then(b => new Promise(res => {
 					const fr = new FileReader();
@@ -22,22 +22,19 @@ type CoverBytesFetcher interface {
 	Fetch(ctx context.Context, sourceURL string) (body []byte, contentType string, err error)
 }

-// fetchCoverBytes routes a cover's byte retrieval by Site: only kagane needs
-// the browser for image bytes — its covers answer a plain fetch with a
-// challenge and `cross-origin-resource-policy: same-origin` — while every
-// other Site's CDN answers plain TLS. Missing fetchers degrade to an error the
-// caller logs, never a fallback onto a path that cannot succeed. One routing
-// rule for the poll and the acquirer, so the two cannot drift apart.
-func fetchCoverBytes(ctx context.Context, site, cover string, browser BrowserCoverFetcher, tls CoverBytesFetcher) ([]byte, string, error) {
-	if site == "kagane" {
+// fetchCoverBytes routes a cover's byte retrieval by URL shape, not by Site
+// name: the browser fetcher's module claims the addresses only it can fetch
+// (kagane's image route answers a plain fetch with a challenge and
+// `cross-origin-resource-policy: same-origin`), and everything else goes over
+// plain TLS. Missing fetchers degrade to an error the caller logs, never a
+// fallback onto a path that cannot succeed. One routing rule for the poll and
+// the acquirer, so the two cannot drift apart.
+func fetchCoverBytes(ctx context.Context, cover string, browser BrowserCoverFetcher, tls CoverBytesFetcher) ([]byte, string, error) {
+	if browserOnlyCoverURL(cover) {
 		if browser == nil {
 			return nil, "", errors.New("no cover fetcher")
 		}
-		imageID, ok := store.KaganeImageID(cover)
-		if !ok {
-			return nil, "", errors.New("invalid kagane cover URL")
-		}
-		return browser.Image(ctx, imageID)
+		return browser.Image(ctx, cover)
 	}
 	if tls == nil {
 		return nil, "", errors.New("no cover fetcher")
@@ -16,9 +16,11 @@ type Fetcher interface {
 	Get(ctx context.Context, url string) (body string, status int, err error)
 }

-// BrowserCoverFetcher retrieves one kagane cover through the browser-backed path.
+// BrowserCoverFetcher retrieves one cover's bytes through the browser-backed
+// path — the only route that clears the challenge kagane's image URLs answer
+// a plain fetch with. Satisfied by BrowserFetcher.
 type BrowserCoverFetcher interface {
-	Image(ctx context.Context, imageID string) (body []byte, contentType string, err error)
+	Image(ctx context.Context, imageURL string) (body []byte, contentType string, err error)
 }

 // Poller re-checks each bookmarked series' newest published chapter on a
@@ -44,8 +46,8 @@ type Poller struct {
 	BrowserFetch Fetcher
 	// CoverFetch is optional; failures are logged and never affect the chapter poll.
 	CoverFetch BrowserCoverFetcher
-	// CoverBytesFetch is optional; it handles non-kagane sources through the same
-	// failure-isolated prefetch path.
+	// CoverBytesFetch is optional; it handles plain-TLS sources through the
+	// same failure-isolated prefetch path.
 	CoverBytesFetch CoverBytesFetcher
 	Now             func() time.Time // injected so tests can freeze it
 	Cooldown        time.Duration
@@ -81,9 +83,10 @@ func (p *Poller) fillBlankCover(ctx context.Context, sr store.Series, body strin

 // prefetchCover heals Series that already carry a third-party source URL but
 // no stored address — the state left by client-supplied covers before
-// acquisition moved server-side. Every Site takes the same path; only the
-// byte fetcher differs (kagane needs the browser). New blanks have no source
-// URL and go through fillBlankCover from the series page instead.
+// acquisition moved server-side. Every Site takes the same path; fetchCoverBytes
+// routes by URL shape, so browser-claimed URLs still need the sidecar. New
+// blanks have no source URL and go through fillBlankCover from the series page
+// instead.
 func (p *Poller) prefetchCover(ctx context.Context, sr store.Series) {
 	if sr.Cover == "" || sr.CoverAddress != "" {
 		return
@@ -106,7 +109,7 @@ 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 := fetchCoverBytes(ctx, sr.Site, sourceURL, p.CoverFetch, p.CoverBytesFetch)
+	bytes, contentType, err := fetchCoverBytes(ctx, sourceURL, p.CoverFetch, p.CoverBytesFetch)
 	if err != nil {
 		log.Printf("latest poll %q: fetch cover %s: %v", sr.Key(), sourceURL, err)
 		return
@@ -116,9 +116,9 @@ type fakeCoverFetcher struct {
 	err         error
 }

-func (f *fakeCoverFetcher) Image(_ context.Context, imageID string) ([]byte, string, error) {
+func (f *fakeCoverFetcher) Image(_ context.Context, imageURL string) ([]byte, string, error) {
 	f.mu.Lock()
-	f.calls = append(f.calls, imageID)
+	f.calls = append(f.calls, imageURL)
 	f.mu.Unlock()
 	if f.err != nil {
 		return nil, "", f.err
@@ -778,9 +778,9 @@ func TestRunOncePrefetchesKaganeCover(t *testing.T) {
 	}
 	p.runOnce(context.Background())

-	body, contentType, ok, err := s.GetKaganeCover("019f84bc-9ba0-7ed9-86f5-8b905ec7c28b")
+	body, contentType, ok, err := s.CoverByAddress(store.CoverAddress(coverURL))
 	if err != nil || !ok {
-		t.Fatalf("GetKaganeCover: %v found=%v", err, ok)
+		t.Fatalf("CoverByAddress: %v found=%v", err, ok)
 	}
 	if string(body) != "cover-bytes" || contentType != "image/webp" {
 		t.Fatalf("stored cover = (%q, %q), want (cover-bytes, image/webp)", body, contentType)
@@ -877,7 +877,7 @@ func TestRunOnceRejectsInvalidKaganeCover(t *testing.T) {
 	}
 	p.runOnce(context.Background())

-	if _, _, found, err := s.GetKaganeCover("019f84bc-9ba0-7ed9-86f5-8b905ec7c28b"); err != nil || found {
+	if _, _, found, err := s.CoverByAddress(store.CoverAddress(coverURL)); err != nil || found {
 		t.Fatalf("invalid cover persisted = %v, err %v; want missing", found, err)
 	}
 }
@@ -902,7 +902,7 @@ func TestRunOnceWithoutCoverFetcherStillPollsKagane(t *testing.T) {
 	}
 	p.runOnce(context.Background())

-	if _, _, found, err := s.GetKaganeCover("019f84bc-9ba0-7ed9-86f5-8b905ec7c28b"); err != nil || found {
+	if _, _, found, err := s.CoverByAddress(store.CoverAddress(coverURL)); err != nil || found {
 		t.Fatalf("cover after nil CoverFetch = found %v, err %v; want missing", found, err)
 	}
 }
@@ -165,6 +165,23 @@ var singleQuotedMetaAttrRe = regexp.MustCompile(`(?is)([a-z][a-z0-9:_-]*)\s*=\s*
 // the target detail entry avoids matching posters from recommended results.
 var comixInitialDataRe = regexp.MustCompile(`(?is)<script\b[^>]*\bid\s*=\s*["']initial-data["'][^>]*>(.*?)</script>`)

+// kaganeImageURLRe matches the canonical compressed image route kagane's API
+// publishes — the only cover URL form the extractor emits and the browser
+// fetcher accepts. The URL is matched in full (scheme, host, id shape) rather
+// than trusted: the value a fetcher is pointed at may have been client-
+// supplied, and a headless browser is a strong SSRF primitive.
+var kaganeImageURLRe = regexp.MustCompile(`^https://kagane\.to/api/v2/image/([0-9a-f-]{36})/compressed$`)
+
+// browserOnlyCoverURL reports whether the browser sidecar is the only fetcher
+// for cover bytes at imageURL. kagane's image route answers a plain fetch with
+// a challenge and `cross-origin-resource-policy: same-origin`, so a TLS fetch
+// would only ever retrieve a challenge page and must not be attempted
+// (ADR-0007). This is the byte-fetch router's per-Site knowledge; it lives in
+// the extraction module, which owns kagane's URL shapes.
+func browserOnlyCoverURL(imageURL string) bool {
+	return kaganeImageURLRe.MatchString(imageURL)
+}
+
 // kagane's browser-fetched series response publishes cover image IDs under
 // series_covers. The API's canonical compressed image route is the only URL
 // form accepted by the store and browser fetcher; no rendition is guessed.
@@ -178,8 +195,12 @@ func kaganeCoverURL(body string) string {
 		return ""
 	}
 	for _, cover := range response.SeriesCovers {
-		if kaganeImageIDRe.MatchString(cover.ImageID) {
-			return "https://kagane.to/api/v2/image/" + cover.ImageID + "/compressed"
+		// Validate the assembled URL against the same regex the browser
+		// fetcher enforces, so the extractor can never emit an address the
+		// fetch would refuse.
+		imageURL := "https://kagane.to/api/v2/image/" + cover.ImageID + "/compressed"
+		if kaganeImageURLRe.MatchString(imageURL) {
+			return imageURL
 		}
 	}
 	return ""
@@ -10,9 +10,10 @@ import (
 	"bookmarkmanager/backend/internal/store"
 )

-// TestSmokeKaganeImage is the live proof that the cover proxy's fetch actually
-// clears Cloudflare and returns image bytes. It needs the real browser unit
-// with outbound network, so it runs only when SMOKE_BROWSER_WS_URL is set:
+// TestSmokeKaganeImage is the live proof that the acquisition path's browser
+// fetch actually clears Cloudflare and returns image bytes. It needs the real
+// browser unit with outbound network, so it runs only when SMOKE_BROWSER_WS_URL
+// is set:
 //
 //	cd chrome && BROWSER_BIND_ADDR=127.0.0.1 docker compose up -d --build
 //	SMOKE_BROWSER_WS_URL=ws://127.0.0.1:9222 go test -run TestSmokeKaganeImage ./internal/latest
@@ -24,12 +25,11 @@ func TestSmokeKaganeImage(t *testing.T) {
 	if ws == "" {
 		t.Skip("SMOKE_BROWSER_WS_URL unset")
 	}
-	const imageID = "019fe11a-84c3-7fc3-a84b-88787374b617" // SP Baby's cover
+	const imageURL = "https://kagane.to/api/v2/image/019fe11a-84c3-7fc3-a84b-88787374b617/compressed" // SP Baby's cover

-	// The same URL through a plain client is what the web UI's <img> gets.
+	// The same URL through a plain client is what any other fetcher would get.
 	// Asserting on it keeps the test honest about why the browser is needed.
-	req, err := http.NewRequest(http.MethodGet,
-		"https://kagane.to/api/v2/image/"+imageID+"/compressed", nil)
+	req, err := http.NewRequest(http.MethodGet, imageURL, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -48,7 +48,7 @@ func TestSmokeKaganeImage(t *testing.T) {

 	ctx, cancel := context.WithTimeout(context.Background(), 90*time.Second)
 	defer cancel()
-	body, contentType, err := f.Image(ctx, imageID)
+	body, contentType, err := f.Image(ctx, imageURL)
 	if err != nil {
 		t.Fatalf("Image: %v", err)
 	}
@@ -64,8 +64,10 @@ func TestSmokeKaganeImage(t *testing.T) {
 	}
 	t.Logf("fetched %d bytes of %s", len(body), contentType)

-	if _, _, err := f.Image(ctx, "not-a-uuid"); err == nil {
-		t.Fatal("Image accepted a non-uuid id")
+	// The browser module claims only the cover URL shape it can clear a
+	// challenge for; anything else must be refused before any navigation.
+	if _, _, err := f.Image(ctx, "https://cdn.example/cover.jpg"); err == nil {
+		t.Fatal("Image accepted a cover URL the browser module does not claim")
 	}
 }

@@ -40,10 +40,6 @@ type Bookmark struct {
 	// address and never an address that 404s (ADR-0007). A client may still
 	// send this field and it is discarded on the way in; see Upsert.
 	Cover string `json:"cover"`
-	// CoverSource is the third-party address the bytes were fetched from. It
-	// stays off the wire: it is the acquisition path's dedupe key, and no
-	// client is ever asked to render one.
-	CoverSource      string   `json:"-"`
 	LastChapter      string   `json:"last_chapter"`
 	LastChapterNum   float64  `json:"last_chapter_num"`
 	LastChapterURL   string   `json:"last_chapter_url"`
@@ -155,20 +151,6 @@ func (b Bookmark) Initial() string {
 	return "?"
 }

-// kaganeCoverRe matches the cover URL kagane's og:image carries, which is what
-// the userscript stores for that site.
-var kaganeCoverRe = regexp.MustCompile(`^https://kagane\.to/api/v2/image/([0-9a-f-]{36})/compressed$`)
-
-// KaganeImageID extracts the validated image id from the cover URL recorded by
-// the userscript.
-func KaganeImageID(cover string) (string, bool) {
-	m := kaganeCoverRe.FindStringSubmatch(cover)
-	if m == nil {
-		return "", false
-	}
-	return m[1], true
-}
-
 // CoverContentType canonicalises a fetched response's media type and reports
 // whether the bytes are safe to store and serve. comix answers "image/jpg",
 // which no standard lists but browsers accept; it is stored as the real name
@@ -184,17 +166,6 @@ func CoverContentType(contentType string) (string, bool) {
 	}
 }

-// CoverURL is the src the web UI puts in an <img>. Cover already is an address
-// on this origin, so for every site but kagane it is used as-is. kagane's
-// bytes still arrive through the browser-backed proxy, which is keyed by image
-// id rather than by content address until #62 moves it onto the same path.
-func (b Bookmark) CoverURL() string {
-	if imageID, ok := KaganeImageID(b.CoverSource); ok {
-		return "/img/kagane/" + imageID
-	}
-	return b.Cover
-}
-
 // Library buckets. A bookmark is in exactly one. This cannot be derived from
 // Site: asurascans serves manga and novels from the same /comics/ path, so the
 // userscript that recorded the page is the only party that knows which.
@@ -217,7 +188,7 @@ var migrations embed.FS
 // compile-time constant; every request value is bound as a parameter. The
 // series-owned fields are joined in from the series table, in scanBookmark
 // order, so the flat Bookmark reads back whole despite the split (ADR-0004).
-const bookmarkColumns = `b.site, b.series_id, s.title, s.series_url, s.cover, s.cover_address,
+const bookmarkColumns = `b.site, b.series_id, s.title, s.series_url, s.cover_address,
 	b.last_chapter, b.last_chapter_num, b.last_chapter_url,
 	b.favorite, s.latest_chapter, s.latest_chapter_num, b.updated_at, b.status, s.kind`

@@ -562,7 +533,7 @@ func (s *Store) scanBookmark(scan func(...any) error) (Bookmark, error) {
 		latestChapterNum sql.NullFloat64
 	)
 	if err := scan(
-		&b.Site, &b.SeriesID, &b.Title, &b.SeriesURL, &b.CoverSource, &coverAddress,
+		&b.Site, &b.SeriesID, &b.Title, &b.SeriesURL, &coverAddress,
 		&b.LastChapter, &b.LastChapterNum, &b.LastChapterURL,
 		&b.Favorite, &b.LatestChapter, &latestChapterNum, &b.UpdatedAt, &b.Status, &b.Kind,
 	); err != nil {
@@ -617,10 +588,6 @@ func coverRelativePath(address string) string {
 	return address[:2] + "/" + address[2:4] + "/" + address
 }

-func kaganeCoverSourceURL(imageID string) string {
-	return "https://kagane.to/api/v2/image/" + imageID + "/compressed"
-}
-
 func (s *Store) getCover(sourceURL string) ([]byte, string, bool, error) {
 	return s.getCoverByAddress(coverSourceAddress(sourceURL))
 }
@@ -703,18 +670,6 @@ func (s *Store) PutCover(sourceURL string, body []byte, contentType string) erro
 	return s.putCover(sourceURL, body, contentType)
 }

-// GetKaganeCover returns one persisted cover. Missing covers are reported with
-// ok=false rather than as an error so the web handler can fetch them once.
-func (s *Store) GetKaganeCover(imageID string) ([]byte, string, bool, error) {
-	return s.getCover(kaganeCoverSourceURL(imageID))
-}
-
-// PutKaganeCover persists one fetched cover. The source URL's content address
-// makes each stored object immutable, so later writes for that URL are ignored.
-func (s *Store) PutKaganeCover(imageID string, body []byte, contentType string) error {
-	return s.putCover(kaganeCoverSourceURL(imageID), body, contentType)
-}
-
 // CoverAddress is the content address bytes fetched from sourceURL are stored
 // under. It is a pure function of the URL, so the acquisition path can name a
 // Cover before it has the bytes.
@@ -550,45 +550,6 @@ func TestDisplayChapter(t *testing.T) {
 	}
 }

-// CoverURL reads the source address for the kagane branch and the wire value
-// otherwise, so both are set the way scanBookmark sets them.
-func TestCoverURL(t *testing.T) {
-	cases := []struct {
-		name        string
-		coverSource string
-		cover       string
-		want        string
-	}{
-		{
-			"kagane routes through the proxy",
-			"https://kagane.to/api/v2/image/019fe11a-84c3-7fc3-a84b-88787374b617/compressed",
-			"https://bookmarks.test/covers/" + CoverAddress("kagane"),
-			"/img/kagane/019fe11a-84c3-7fc3-a84b-88787374b617",
-		},
-		{
-			"another site is served from our own origin",
-			"https://gg.asuracomic.net/storage/media/1/conversions/cover.webp",
-			"https://bookmarks.test/covers/" + CoverAddress("asura"),
-			"https://bookmarks.test/covers/" + CoverAddress("asura"),
-		},
-		{
-			"a lookalike host is not rewritten",
-			"https://evil.example/api/v2/image/019fe11a-84c3-7fc3-a84b-88787374b617/compressed",
-			"https://bookmarks.test/covers/" + CoverAddress("evil"),
-			"https://bookmarks.test/covers/" + CoverAddress("evil"),
-		},
-		{"no cover stays empty", "", "", ""},
-	}
-	for _, tc := range cases {
-		t.Run(tc.name, func(t *testing.T) {
-			b := Bookmark{CoverSource: tc.coverSource, Cover: tc.cover}
-			if got := b.CoverURL(); got != tc.want {
-				t.Errorf("CoverURL() = %q, want %q", got, tc.want)
-			}
-		})
-	}
-}
-
 func TestUpsertKindDefaultsToManga(t *testing.T) {
 	store := newTestStore(t)
 	got, err := store.Upsert(store.OwnerID(), Bookmark{
@@ -1397,7 +1358,7 @@ func TestTwoReadersShareOneSeriesWithIndependentProgress(t *testing.T) {
 		t.Fatalf("due after one Reader left = %+v, want the series still polled", due)
 	}
 }
-func TestKaganeCoverPersistsAcrossReopen(t *testing.T) {
+func TestCoverPersistsAcrossReopen(t *testing.T) {
 	url := pgtest.URL(t)
 	coverDir := t.TempDir()
 	first, err := Open(url, testOwner, coverDir, testCoverBaseURL)
@@ -1405,8 +1366,9 @@ func TestKaganeCoverPersistsAcrossReopen(t *testing.T) {
 		t.Fatalf("Open: %v", err)
 	}
 	body := []byte("stored-cover")
-	if err := first.PutKaganeCover("019fe11a-84c3-7fc3-a84b-88787374b617", body, "image/webp"); err != nil {
-		t.Fatalf("PutKaganeCover: %v", err)
+	const sourceURL = "https://cdn.example/covers/series.jpg"
+	if err := first.PutCover(sourceURL, body, "image/webp"); err != nil {
+		t.Fatalf("PutCover: %v", err)
 	}
 	if err := first.Close(); err != nil {
 		t.Fatalf("close first store: %v", err)
@@ -1417,9 +1379,9 @@ func TestKaganeCoverPersistsAcrossReopen(t *testing.T) {
 		t.Fatalf("reopen: %v", err)
 	}
 	defer second.Close()
-	got, contentType, ok, err := second.GetKaganeCover("019fe11a-84c3-7fc3-a84b-88787374b617")
+	got, contentType, ok, err := second.GetCover(sourceURL)
 	if err != nil {
-		t.Fatalf("GetKaganeCover: %v", err)
+		t.Fatalf("GetCover: %v", err)
 	}
 	if !ok || !bytes.Equal(got, body) || contentType != "image/webp" {
 		t.Fatalf("stored cover = (%q, %q, %v), want (%q, image/webp, true)", got, contentType, ok, body)
@@ -1443,7 +1405,7 @@ func TestOpenRequiresAbsoluteCoverBaseURL(t *testing.T) {
 	}
 }

-func TestKaganeCoverIsContentAddressedOnFilesystem(t *testing.T) {
+func TestCoverIsContentAddressedOnFilesystem(t *testing.T) {
 	url := pgtest.URL(t)
 	coverDir := t.TempDir()
 	first, err := Open(url, testOwner, coverDir, testCoverBaseURL)
@@ -1451,14 +1413,13 @@ func TestKaganeCoverIsContentAddressedOnFilesystem(t *testing.T) {
 		t.Fatalf("Open: %v", err)
 	}
 	body := []byte("stored-cover")
-	const imageID = "019fe11a-84c3-7fc3-a84b-88787374b617"
-	if err := first.PutKaganeCover(imageID, body, "image/webp"); err != nil {
+	const sourceURL = "https://cdn.example/covers/series.jpg"
+	if err := first.PutCover(sourceURL, body, "image/webp"); err != nil {
 		first.Close()
-		t.Fatalf("PutKaganeCover: %v", err)
+		t.Fatalf("PutCover: %v", err)
 	}
 	defer first.Close()

-	sourceURL := "https://kagane.to/api/v2/image/" + imageID + "/compressed"
 	addressBytes := sha256.Sum256([]byte(sourceURL))
 	address := hex.EncodeToString(addressBytes[:])
 	wantPath := filepath.Join(address[:2], address[2:4], address)
@@ -1,89 +0,0 @@
-package web
-
-import (
-	"bookmarkmanager/backend/internal/store"
-	"context"
-	"log"
-	"net/http"
-	"regexp"
-	"time"
-)
-
-// CoverFetcher retrieves one kagane cover by image id. Satisfied by
-// latest.BrowserFetcher. It is nil when BROWSER_WS_URL is unset; uncached
-// covers are then unavailable, while covers already stored by the backend
-// remain available without a browser.
-type CoverFetcher interface {
-	Image(ctx context.Context, imageID string) (body []byte, contentType string, err error)
-}
-
-// coverIDRe matches the request path segment that becomes part of an outbound
-// URL. The proxy is session-gated, but the id still reaches a headless browser,
-// so it is validated at the boundary rather than passed through.
-var coverIDRe = regexp.MustCompile(`^[0-9a-f-]{36}$`)
-
-// coverTimeout bounds one proxied cover. Shorter than the fetcher's own
-// challenge budget on purpose: a browser page is waiting on this, and a cover
-// that has not arrived by now is better left as a broken slot than as a request
-// holding a connection open.
-const coverTimeout = 20 * time.Second
-
-// kaganeCover serves a kagane cover from the backend's own origin.
-//
-// kagane answers image requests with a Cloudflare challenge and
-// `cross-origin-resource-policy: same-origin`, so the web UI cannot render one
-// directly under any combination of referrer policy or crossorigin attribute
-// (verified 2026-08-08). Fetching it through the headless browser that already
-// clears the challenge, and re-serving it here, is what puts the bytes on an
-// origin the page may load from.
-func (h *Handler) kaganeCover(w http.ResponseWriter, r *http.Request) {
-	id := r.PathValue("id")
-	if !coverIDRe.MatchString(id) {
-		http.NotFound(w, r)
-		return
-	}
-	body, contentType, ok, err := h.store.GetKaganeCover(id)
-	if err != nil {
-		log.Printf("read kagane cover %s: %v", id, err)
-		http.Error(w, "internal error", http.StatusInternalServerError)
-		return
-	}
-	if ok {
-		writeCover(w, body, contentType)
-		return
-	}
-	if h.covers == nil {
-		http.NotFound(w, r)
-		return
-	}
-
-	ctx, cancel := context.WithTimeout(r.Context(), coverTimeout)
-	defer cancel()
-	body, contentType, err = h.covers.Image(ctx, id)
-	if err != nil {
-		log.Printf("kagane cover %s: %v", id, err)
-		http.NotFound(w, r)
-		return
-	}
-	canonical, ok := store.CoverContentType(contentType)
-	if !ok {
-		log.Printf("kagane cover %s: unexpected content type %q", id, contentType)
-		http.NotFound(w, r)
-		return
-	}
-	contentType = canonical
-	if err := h.store.PutKaganeCover(id, body, contentType); err != nil {
-		log.Printf("persist kagane cover %s: %v", id, err)
-		http.Error(w, "internal error", http.StatusInternalServerError)
-		return
-	}
-	writeCover(w, body, contentType)
-}
-
-// writeCover sends the bytes with a long cache life: an image id names one
-// immutable rendering, so a client that has it never needs to ask again.
-func writeCover(w http.ResponseWriter, body []byte, contentType string) {
-	w.Header().Set("Content-Type", contentType)
-	w.Header().Set("Cache-Control", "private, max-age=604800, immutable")
-	w.Write(body)
-}
@@ -6,7 +6,7 @@
  <div class="row">
    <a class="cover" href="{{.ContinueURL}}" target="_blank" rel="noopener noreferrer"
       tabindex="-1" aria-hidden="true">
-      {{if .CoverURL}}<img src="{{.CoverURL}}" alt="" loading="lazy">
+      {{if .Cover}}<img src="{{.Cover}}" alt="" loading="lazy">
      {{/* aria-hidden on the cover link is not enough — Chromium still exposes
           the letter because the link is programmatically focusable — so the
           monogram carries its own, same as the recent strip's. */}}
@@ -14,7 +14,7 @@
    <a class="recent-card {{if .HasNewChapter}}is-new{{end}}" href="{{.ContinueURL}}"
       target="_blank" rel="noopener noreferrer">
      <span class="recent-cover">
-        {{if .CoverURL}}<img src="{{.CoverURL}}" alt="" loading="lazy">
+        {{if .Cover}}<img src="{{.Cover}}" alt="" loading="lazy">
        {{else}}<span class="monogram" aria-hidden="true">{{.Initial}}</span>{{end}}
        {{if .HasNewChapter}}<span class="foot-rule"></span>
        {{else if .Favorite}}<span class="foot-rule brass"></span>{{end}}
@@ -50,9 +50,6 @@ type Handler struct {
 	// httpClient is the plain stdlib client that talks to Discord. It is not
 	// an injected interface: tests point APIBase at a stub server instead.
 	httpClient *http.Client
-	// covers proxies kagane cover images, which no browser can load directly.
-	// Nil disables the endpoint — see CoverFetcher.
-	covers CoverFetcher
 }

 // listView is what every list-rendering template receives.
@@ -114,7 +111,7 @@ type loginView struct {

 // New parses every template up front so a broken one kills the process at
 // startup rather than the first request that touches it.
-func New(s *store.Store, discord DiscordConfig, tokenKey []byte, mangaPath, novelPath string, covers CoverFetcher) (*Handler, error) {
+func New(s *store.Store, discord DiscordConfig, tokenKey []byte, mangaPath, novelPath string) (*Handler, error) {
 	tmpl, err := template.ParseFS(templateFS, "templates/*.html")
 	if err != nil {
 		return nil, err
@@ -129,7 +126,6 @@ func New(s *store.Store, discord DiscordConfig, tokenKey []byte, mangaPath, nove
 		states:              newOAuthStates(),
 		limiter:             session.NewLoginLimiter(),
 		httpClient:          &http.Client{Timeout: discordTimeout},
-		covers:              covers,
 	}, nil
 }

@@ -146,10 +142,6 @@ func (h *Handler) Register(mux *http.ServeMux) {
 	mux.HandleFunc("POST /ui/bookmarks/{key}/chapter", h.requireSession(h.uiChapter))
 	mux.HandleFunc("DELETE /ui/bookmarks/{key}", h.requireSession(h.uiDelete))

-	// Session-gated like every other UI route: the deployment proxies kagane's
-	// images for its own Readers, not for the internet.
-	mux.HandleFunc("GET /img/kagane/{id}", h.requireSession(h.kaganeCover))
-
 	// Install endpoints render the script directly under the session: the
 	// credential travels inside the served bytes, never in the address bar or
 	// the page markup. Updates after install use the credential-bearing /u/