Refactor: split monolith into cmd/palette + internal/{store,api,web,lang} (#35)

.gitignore

@@ -2,3 +2,5 @@ palette
 palette.db
 palette.db-shm
 palette.db-wal
+admin-key
+settings.json

Dockerfile

@@ -9,7 +9,7 @@ COPY go.mod go.sum ./
 RUN go mod download
 
 COPY . .
-RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /palette .
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /palette ./cmd/palette
 
 # ---- runtime stage ----
 FROM alpine:3.20

burn.go

@@ -1,114 +0,0 @@
-package main
-
-import (
-	"crypto/rand"
-	"crypto/subtle"
-	"database/sql"
-	"encoding/base64"
-	"net/http"
-	"time"
-
-	"github.com/go-chi/chi/v5"
-)
-
-// genDeletionToken returns a 32-char url-safe random token
-func genDeletionToken() string {
-	b := make([]byte, 24)
-	rand.Read(b)
-	return base64.RawURLEncoding.EncodeToString(b)
-}
-
-// readWindowMinutes is the per-viewer dedupe window for burn-after-N-reads
-// (#49): the same viewer cookie returning within 15 minutes does not count
-// as a new read. See the decision comment on issue #49.
-const readWindowMinutes = 15
-
-// burnViewerWindowMinutes returns the admin-tunable per-viewer dedupe window
-// (#40), falling back to the 15-minute default from #49.
-func burnViewerWindowMinutes() int {
-	if globalSettingsFn != nil {
-		if m := globalSettings().BurnViewerWindowMinutes; m > 0 {
-			return m
-		}
-	}
-	return readWindowMinutes
-}
-
-// timeNow is overridable in tests to inject the clock.
-var timeNow = time.Now
-
-// registerRead applies the burn-after-read budget for one view (#49).
-// For pastes with reads_limit set: the viewer's paste_views row is checked;
-// a view within readWindowMinutes of the viewer's last view is deduped
-// (count=false). Otherwise reads_used is incremented, and the paste is
-// soft-deleted (burned) once reads_used reaches reads_limit. Viewers without
-// a cookie (plain API clients) count as their own viewer id "".
-// For legacy plain burn_after_read pastes (no reads_limit), any read burns.
-// Returns the number of reads remaining (0 when burned), or nil when no
-// budget is set. view_count is tracked separately and unaffected.
-func (s *Store) registerRead(row *PasteRow, viewerID string) (remaining *int, count bool) {
-	if !row.ReadsLimit.Valid {
-		if row.BurnAfterRead {
-			s.SoftDelete(row.ID)
-			r := 0
-			return &r, true
-		}
-		return nil, false
-	}
-	now := timeNow().Unix()
-	var last sql.NullInt64
-	s.db.QueryRow(`SELECT last_viewed FROM paste_views WHERE paste_id=? AND viewer_id=?`,
-		row.ID, viewerID).Scan(&last)
-	if last.Valid && now-last.Int64 < int64(burnViewerWindowMinutes())*60 {
-		r := int(row.ReadsLimit.Int64) - row.ReadsUsed
-		if r < 0 {
-			r = 0
-		}
-		return &r, false
-	}
-	s.db.Exec(`INSERT INTO paste_views (paste_id, viewer_id, last_viewed) VALUES (?,?,?)
-		ON CONFLICT(paste_id, viewer_id) DO UPDATE SET last_viewed = excluded.last_viewed`,
-		row.ID, viewerID, now)
-	used := row.ReadsUsed + 1
-	s.db.Exec(`UPDATE pastes SET reads_used=? WHERE id=?`, used, row.ID)
-	if int64(used) >= row.ReadsLimit.Int64 {
-		s.SoftDelete(row.ID)
-	}
-	r := int(row.ReadsLimit.Int64) - int(used)
-	if r < 0 {
-		r = 0
-	}
-	return &r, true
-}
-
-// burned reports whether a read-limited paste has exhausted its budget.
-func (row *PasteRow) burned() bool {
-	return row.ReadsLimit.Valid && int64(row.ReadsUsed) >= row.ReadsLimit.Int64
-}
-
-func deletionTokenEqual(stored, given string) bool {
-	return subtle.ConstantTimeCompare([]byte(stored), []byte(given)) == 1
-}
-
-// handleRedeemDeletion lets a holder of the deletion token hard-delete immediately.
-// DELETE /api/pastes/{id}/redeem?token=...
-func (a *apiServer) handleRedeemDeletion(w http.ResponseWriter, r *http.Request) {
-	id := chi.URLParam(r, "id")
-	token := r.URL.Query().Get("token")
-	if token == "" {
-		writeErr(w, 400, "token required")
-		return
-	}
-	row, err := a.store.GetPaste(id)
-	if err != nil || row == nil {
-		writeErr(w, 404, "paste not found")
-		return
-	}
-	if row.DeletionToken.String == "" || !deletionTokenEqual(row.DeletionToken.String, token) {
-		writeErr(w, 403, "invalid token")
-		return
-	}
-	// hard delete: pastes table row goes away entirely
-	a.store.db.Exec(`DELETE FROM pastes WHERE id = ?`, row.ID)
-	writeJSON(w, 200, map[string]string{"status": "deleted"})
-}

internal/api/admin.go

@@ -1,6 +1,7 @@
-package main
+package api
 
 import (
+	"palette/internal/store"
 	"crypto/rand"
 	"crypto/subtle"
 	"encoding/hex"
@@ -37,8 +38,8 @@ func defaultSettings(cfg Config) Settings {
 		RateLimitPerMinute:         60, // 1 req/sec refill
 		MaxContentBytes:            cfg.MaxTextBytes,
 		DefaultExpiry:              "", // no default: pastes are permanent unless expires_in given
-		CustomSlugReservationDays:  customSlugReservationDays,
-		BurnViewerWindowMinutes:    readWindowMinutes,
+		CustomSlugReservationDays:  30,
+		BurnViewerWindowMinutes:    15,
 	}
 }
 
@@ -50,7 +51,8 @@ type settingsStore struct {
 	path string
 }
 
-func loadSettingsStore(dbPath string, cfg Config) *settingsStore {
+// LoadSettingsStore loads (or initializes) the settings store.
+func LoadSettingsStore(dbPath string, cfg Config) *settingsStore {
 	p := filepath.Join(filepath.Dir(dbPath), "settings.json")
 	ss := &settingsStore{cur: defaultSettings(cfg), path: p}
 	if b, err := os.ReadFile(p); err == nil {
@@ -95,7 +97,7 @@ func (ss *settingsStore) set(s Settings) error {
 	}
 	if s.DefaultExpiry != "" {
 		d, err := time.ParseDuration(s.DefaultExpiry)
-		if err != nil || !validExpiry(d) {
+		if err != nil || !store.ValidExpiry(d) {
 			return fmt.Errorf("default_expiry must be a duration between 1 minute and 1 year (or empty)")
 		}
 	}
@@ -111,7 +113,8 @@ func (ss *settingsStore) set(s Settings) error {
 
 // resetAdminKeyFile deletes the persisted admin key file (if any) and returns
 // the path so callers can regenerate. Used by --reset-admin-key (#40).
-func resetAdminKeyFile(dbPath string) string {
+// ResetAdminKeyFile deletes the persisted admin key file (if any).
+func ResetAdminKeyFile(dbPath string) string {
 	p := filepath.Join(filepath.Dir(dbPath), "admin-key")
 	os.Remove(p)
 	return p
@@ -120,7 +123,10 @@ func resetAdminKeyFile(dbPath string) string {
 // resolveAdminKey returns the admin key: env PALETTE_ADMIN_KEY wins; else the
 // persisted key file is reused; else a new 32-char hex key is generated and
 // persisted with 0600 perms.
-func resolveAdminKey(dbPath string) (string, error) {
+// ResolveAdminKey returns the admin key: env PALETTE_ADMIN_KEY wins; else the
+// persisted key file is reused; else a new 32-char hex key is generated and
+// persisted with 0600 perms.
+func ResolveAdminKey(dbPath string) (string, error) {
 	if v := os.Getenv("PALETTE_ADMIN_KEY"); v != "" {
 		return v, nil
 	}
@@ -142,9 +148,11 @@ func resolveAdminKey(dbPath string) (string, error) {
 
 // handleResetAdminKey implements the --reset-admin-key flag: delete the key
 // file, generate a fresh key, print it.
-func handleResetAdminKey(dbPath string) {
-	p := resetAdminKeyFile(dbPath)
-	key, err := resolveAdminKey(dbPath)
+// HandleResetAdminKey implements the --reset-admin-key flag: delete the key
+// file, generate a fresh key, print it.
+func HandleResetAdminKey(dbPath string) {
+	p := ResetAdminKeyFile(dbPath)
+	key, err := ResolveAdminKey(dbPath)
 	if err != nil {
 		log.Fatalf("reset admin key: %v", err)
 	}
@@ -174,10 +182,6 @@ func (a *apiServer) adminAuth(next http.HandlerFunc, key string) http.HandlerFun
 	}
 }
 
-func (a *apiServer) handleAdminPage(w http.ResponseWriter, r *http.Request) {
-	renderPage(w, "admin.html", map[string]any{"Page": "admin"})
-}
-
 func (a *apiServer) handleAdminGetSettings(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, 200, a.settings.get())
 }
@@ -194,3 +198,6 @@ func (a *apiServer) handleAdminPostSettings(w http.ResponseWriter, r *http.Reque
 	}
 	writeJSON(w, 200, a.settings.get())
 }
+
+// Get returns the current settings (exported for cmd wiring).
+func (ss *settingsStore) Get() Settings { return ss.get() }

internal/api/admin_test.go

@@ -1,4 +1,4 @@
-package main
+package api
 
 import (
 	"encoding/json"
@@ -10,10 +10,10 @@ import (
 )
 
 // newTestSettingsStore builds an in-memory settings store with a temp file.
-func newTestSettingsStore(t *testing.T, cfg Config) *settingsStore {
+func NewTestSettingsStore(t *testing.T, cfg Config) *settingsStore {
 	t.Helper()
 	dir := t.TempDir()
-	ss := loadSettingsStore(filepath.Join(dir, "palette.db"), cfg)
+	ss := LoadSettingsStore(filepath.Join(dir, "palette.db"), cfg)
 	// point persistence at a temp path (dir(dbPath) == dir)
 	return ss
 }
@@ -65,7 +65,7 @@ func TestAdminEnvKeyPrecedence(t *testing.T) {
 	dir := t.TempDir()
 	dbPath := filepath.Join(dir, "palette.db")
 	t.Setenv("PALETTE_ADMIN_KEY", "envkey1234567890abcdef")
-	key, err := resolveAdminKey(dbPath)
+	key, err := ResolveAdminKey(dbPath)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -78,7 +78,7 @@ func TestAdminEnvKeyPrecedence(t *testing.T) {
 
 	// unset env: file takes over
 	os.Unsetenv("PALETTE_ADMIN_KEY")
-	key2, err := resolveAdminKey(dbPath)
+	key2, err := ResolveAdminKey(dbPath)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -89,7 +89,7 @@ func TestAdminEnvKeyPrecedence(t *testing.T) {
 		t.Fatalf("admin-key file perms: %v err %v", fi, err)
 	}
 	// reuse on subsequent boots
-	key3, _ := resolveAdminKey(dbPath)
+	key3, _ := ResolveAdminKey(dbPath)
 	if key3 != key2 {
 		t.Fatal("persisted key not reused")
 	}
@@ -158,10 +158,10 @@ func TestAdminResetKey(t *testing.T) {
 	dir := t.TempDir()
 	dbPath := filepath.Join(dir, "palette.db")
 	os.Unsetenv("PALETTE_ADMIN_KEY")
-	key1, _ := resolveAdminKey(dbPath)
+	key1, _ := ResolveAdminKey(dbPath)
 	// direct invocation of the reset behavior
-	resetAdminKeyFile(dbPath)
-	key2, _ := resolveAdminKey(dbPath)
+	ResetAdminKeyFile(dbPath)
+	key2, _ := ResolveAdminKey(dbPath)
 	if key1 == key2 {
 		t.Fatal("reset did not regenerate key")
 	}

internal/api/burn.go

@@ -0,0 +1,43 @@
+package api
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+
+	"palette/internal/store"
+)
+
+// burnViewerWindow returns the admin-tunable per-viewer dedupe window
+// (#40), falling back to the 15-minute default from #49.
+func (a *apiServer) burnViewerWindow() int {
+	if a.settings != nil {
+		if m := a.settings.get().BurnViewerWindowMinutes; m > 0 {
+			return m
+		}
+	}
+	return 15
+}
+
+// handleRedeemDeletion lets a holder of the deletion token hard-delete immediately.
+// DELETE /api/pastes/{id}/redeem?token=...
+func (a *apiServer) handleRedeemDeletion(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	token := r.URL.Query().Get("token")
+	if token == "" {
+		writeErr(w, 400, "token required")
+		return
+	}
+	row, err := a.store.GetPaste(id)
+	if err != nil || row == nil {
+		writeErr(w, 404, "paste not found")
+		return
+	}
+	if row.DeletionToken.String == "" || !store.DeletionTokenEqual(row.DeletionToken.String, token) {
+		writeErr(w, 403, "invalid token")
+		return
+	}
+	// hard delete: pastes table row goes away entirely
+	a.store.HardDelete(row.ID)
+	writeJSON(w, 200, map[string]string{"status": "deleted"})
+}

internal/api/burn_test.go

@@ -1,4 +1,4 @@
-package main
+package api
 
 import (
 	"encoding/json"
@@ -71,7 +71,7 @@ func TestDeletionTokenRedeem(t *testing.T) {
 
 	// gone for good: even soft-deleted lookup returns nothing, and row count is 0
 	var n int
-	s.store.db.QueryRow(`SELECT COUNT(*) FROM pastes WHERE id=?`, created.ID).Scan(&n)
+	n = s.store.QueryInt(`SELECT COUNT(*) FROM pastes WHERE id=?`, created.ID)
 	if n != 0 {
 		t.Fatal("row still exists after redeem")
 	}

internal/api/burnreads_test.go

@@ -1,6 +1,8 @@
-package main
+package api
 
 import (
+	"palette/internal/store"
+
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
@@ -87,19 +89,19 @@ func TestBurnReadsWindowExpiryRecounts(t *testing.T) {
 	id := createBurnReads(t, h, 2)
 
 	base := time.Now()
-	timeNow = func() time.Time { return base }
-	t.Cleanup(func() { timeNow = time.Now })
+	store.TimeNow = func() time.Time { return base }
+	t.Cleanup(func() { store.TimeNow = time.Now })
 
 	if rec := getWithCookie(t, h, id, "aaa"); rec.Code != 200 {
 		t.Fatalf("read 1: %d", rec.Code)
 	}
 	// 10 minutes later: still within window, deduped
-	timeNow = func() time.Time { return base.Add(10 * time.Minute) }
+	store.TimeNow = func() time.Time { return base.Add(10 * time.Minute) }
 	if rec := getWithCookie(t, h, id, "aaa"); rec.Code != 200 {
 		t.Fatalf("re-read within window: %d", rec.Code)
 	}
 	// 20 minutes after first read: window expired, counts as read 2
-	timeNow = func() time.Time { return base.Add(20 * time.Minute) }
+	store.TimeNow = func() time.Time { return base.Add(20 * time.Minute) }
 	if rec := getWithCookie(t, h, id, "aaa"); rec.Code != 200 {
 		t.Fatalf("re-read after window expected 200, got %d", rec.Code)
 	}
@@ -130,13 +132,6 @@ func TestBurnReadsDefaultOne(t *testing.T) {
 }
 
 func TestBurnReadsPageViewCounts(t *testing.T) {
-	if webUIInstance == nil {
-		ui, err := NewWebUI()
-		if err != nil {
-			t.Fatal(err)
-		}
-		webUIInstance = ui
-	}
 	s := testServer(t)
 	h := s.routes()
 	id := createBurnReads(t, h, 2)

internal/api/cans.go

@@ -1,7 +1,7 @@
-package main
+package api
 
 import (
-	"database/sql"
+	"palette/internal/store"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -45,7 +45,7 @@ func (a *apiServer) handleCreateCan(w http.ResponseWriter, r *http.Request) {
 	}
 	var pwHash *string
 	if password != "" {
-		h, err := hashPassword(password)
+		h, err := store.Argon2IDHash(password)
 		if err != nil {
 			writeErr(w, 500, "hash error")
 			return
@@ -53,9 +53,8 @@ func (a *apiServer) handleCreateCan(w http.ResponseWriter, r *http.Request) {
 		pwHash = &h
 	}
 
-	canID := genSlug(8)
-	_, err := a.store.db.Exec(`INSERT INTO paste_cans (id, title, description, visibility, password_hash, created_at, expires_at)
-		VALUES (?,?,?,?,?,?,?)`, canID, title, r.FormValue("description"), visibility, pwHash, now, expiresAt)
+	canID := store.GenSlug(8)
+	err := a.store.InsertCan(canID, title, r.FormValue("description"), visibility, pwHash, now, expiresAt)
 	if err != nil {
 		writeErr(w, 500, "db error")
 		return
@@ -76,7 +75,7 @@ func (a *apiServer) handleCreateCan(w http.ResponseWriter, r *http.Request) {
 				return
 			}
 			lang := it["language"]
-			if err := a.store.insertCanItem(canID, it["title"], content, "text/plain", &lang, nil, nil, now); err != nil {
+			if err := a.store.InsertCanItem(canID, it["title"], content, "text/plain", &lang, nil, nil, now); err != nil {
 				writeErr(w, 500, "db error")
 				return
 			}
@@ -104,7 +103,7 @@ func (a *apiServer) handleCreateCan(w http.ResponseWriter, r *http.Request) {
 					return
 				}
 				contentStr := string(content)
-				if err := a.store.insertCanItem(canID, fh.Filename, contentStr, detectContentType(fh.Filename, content), nil, nil, &contentStr, now); err != nil {
+				if err := a.store.InsertCanItem(canID, fh.Filename, contentStr, detectContentType(fh.Filename, content), nil, nil, &contentStr, now); err != nil {
 					writeErr(w, 500, "db error")
 					return
 				}
@@ -114,7 +113,7 @@ func (a *apiServer) handleCreateCan(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if itemCount == 0 {
-		a.store.db.Exec(`DELETE FROM paste_cans WHERE id=?`, canID)
+		a.store.DeleteCan(canID)
 		writeErr(w, 400, "can needs at least one item (files or json_items)")
 		return
 	}
@@ -144,45 +143,7 @@ func detectContentType(name string, content []byte) string {
 	return "text/plain"
 }
 
-func (s *Store) insertCanItem(canID, title, content, contentType string, language, expiresAt *string, binary *string, now int64) error {
-	// language/expiresAt unused here for now; content stored as text (binary-safe in sqlite)
-	_, err := s.db.Exec(`INSERT INTO pastes
-		(id, content, content_type, language, title, visibility, can_id, created_at)
-		VALUES (?,?,?,?,?,?,?,?)`,
-		genSlug(6), content, contentType, language, &title, "unlisted", canID, now)
-	_ = expiresAt
-	_ = binary
-	return err
-}
 
-func (s *Store) GetCan(id string) (*CanRow, error) {
-	row := s.db.QueryRow(`SELECT id, title, visibility, password_hash, created_at, deleted_at, expires_at
-		FROM paste_cans WHERE id = ? AND deleted_at IS NULL`, id)
-	var c CanRow
-	err := row.Scan(&c.ID, &c.Title, &c.Visibility, &c.PasswordHash, &c.CreatedAt, &c.DeletedAt, &c.ExpiresAt)
-	if err == sql.ErrNoRows {
-		return nil, nil
-	}
-	return &c, err
-}
-
-func (s *Store) ListCanItems(canID string) ([]PasteRow, error) {
-	rows, err := s.db.Query(`SELECT id, custom_slug, content, content_type, language, title, password_hash, expires_at, burn_after_read, visibility, can_id, created_at, deleted_at, view_count
-		FROM pastes WHERE can_id = ? AND deleted_at IS NULL ORDER BY created_at ASC`, canID)
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-	var out []PasteRow
-	for rows.Next() {
-		var r PasteRow
-		if err := rows.Scan(&r.ID, &r.CustomSlug, &r.Content, &r.ContentType, &r.Language, &r.Title, &r.PasswordHash, &r.ExpiresAt, &r.BurnAfterRead, &r.Visibility, &r.CanID, &r.CreatedAt, &r.DeletedAt, &r.ViewCount); err != nil {
-			return nil, err
-		}
-		out = append(out, r)
-	}
-	return out, nil
-}
 
 func (a *apiServer) handleGetCan(w http.ResponseWriter, r *http.Request) {
 	id := chi.URLParam(r, "id")
@@ -204,7 +165,7 @@ func (a *apiServer) handleGetCan(w http.ResponseWriter, r *http.Request) {
 		if pw == "" {
 			pw = r.URL.Query().Get("password")
 		}
-		if pw == "" || !checkPassword(can.PasswordHash.String, pw) {
+		if pw == "" || !store.CheckPassword(can.PasswordHash.String, pw) {
 			writeErr(w, 401, "password required")
 			return
 		}
@@ -224,12 +185,12 @@ func (a *apiServer) handleGetCan(w http.ResponseWriter, r *http.Request) {
 	metas := make([]itemMeta, 0, len(items))
 	for _, it := range items {
 		metas = append(metas, itemMeta{
-			ID: it.ID, Title: nullStrPtr(it.Title), ContentType: it.ContentType,
+			ID: it.ID, Title: store.NullStrPtr(it.Title), ContentType: it.ContentType,
 			Size: len(it.Content), URL: "/api/pastes/" + it.ID,
 		})
 	}
 	writeJSON(w, 200, map[string]any{
-		"id": can.ID, "title": nullStrPtr(can.Title), "visibility": can.Visibility,
+		"id": can.ID, "title": store.NullStrPtr(can.Title), "visibility": can.Visibility,
 		"created_at": can.CreatedAt, "items": metas,
 	})
 }
@@ -253,7 +214,7 @@ func (a *apiServer) handleCanItem(w http.ResponseWriter, r *http.Request) {
 		if pw == "" {
 			pw = r.URL.Query().Get("password")
 		}
-		if pw == "" || !checkPassword(can.PasswordHash.String, pw) {
+		if pw == "" || !store.CheckPassword(can.PasswordHash.String, pw) {
 			writeErr(w, 401, "password required")
 			return
 		}

internal/api/cans_test.go

@@ -1,4 +1,4 @@
-package main
+package api
 
 import (
 	"bytes"

internal/api/customslug_test.go

@@ -1,6 +1,8 @@
-package main
+package api
 
 import (
+	"palette/internal/store"
+
 	"encoding/json"
 	"net/http/httptest"
 	"strings"
@@ -61,7 +63,7 @@ func TestCustomSlugValidation(t *testing.T) {
 func TestSlugCollisionWithAutoID(t *testing.T) {
 	s := testServer(t)
 	// manually insert a paste, then try to claim its auto ID as a custom slug
-	p, err := s.store.CreatePaste(&Paste{Content: "auto"})
+	p, err := s.store.CreatePaste(&store.Paste{Content: "auto"})
 	if err != nil {
 		t.Fatal(err)
 	}

internal/api/guess.go

@@ -0,0 +1,26 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"palette/internal/lang"
+)
+
+// handleGuessLang serves POST /api/guess-language.
+func (a *apiServer) handleGuessLang(w http.ResponseWriter, r *http.Request) {
+	setRateLimitHeaders(w, 1, 5)
+	if !rateLimitGuess(r) {
+		writeRateLimited(w, 1)
+		return
+	}
+	var req struct {
+		Content string `json:"content"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeErr(w, http.StatusBadRequest, "invalid json body")
+		return
+	}
+	l := lang.GuessLang(req.Content)
+	writeJSON(w, http.StatusOK, map[string]any{"language": l})
+}

internal/api/main_test.go

@@ -1,6 +1,9 @@
-package main
+package api
 
 import (
+	"palette/internal/store"
+	"palette/internal/web"
+
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
@@ -12,22 +15,19 @@ import (
 func testServer(t *testing.T) *apiServer {
 	t.Helper()
 	globalLimiter = newLimiter() // fresh buckets per test
-	if webUIInstance == nil {
-		ui, err := NewWebUI()
-		if err != nil {
-			t.Fatal(err)
-		}
-		webUIInstance = ui
+	ui, err := web.New()
+	if err != nil {
+		t.Fatal(err)
 	}
-	store, err := OpenStore(":memory:")
+	st, err := store.OpenStore(":memory:")
 	if err != nil {
 		t.Fatal(err)
 	}
 	cfg := Config{MaxTextBytes: 5 * 1024 * 1024, MaxItemBytes: 25 * 1024 * 1024}
-	ss := newTestSettingsStore(t, cfg)
+	ss := NewTestSettingsStore(t, cfg)
 	globalSettingsFn = ss.get
 	t.Cleanup(func() { globalSettingsFn = nil })
-	return &apiServer{store: store, cfg: cfg, settings: ss, adminKey: "test-admin-key"}
+	return &apiServer{store: st, cfg: cfg, ui: ui, settings: ss, adminKey: "test-admin-key"}
 }
 
 func TestCreateAndGetPaste(t *testing.T) {
@@ -188,13 +188,13 @@ func TestSweepSoftDeletesAfterGrace(t *testing.T) {
 	s.store.SoftDelete(created.ID)
 
 	// simulate grace elapsed
-	past := time.Now().Unix() - (softDeleteGraceDays+1)*86400
-	s.store.db.Exec(`UPDATE pastes SET deleted_at=? WHERE id=?`, past, created.ID)
+	past := time.Now().Unix() - (store.SoftDeleteGraceDays+1)*86400
+	s.store.Exec(`UPDATE pastes SET deleted_at=? WHERE id=?`, past, created.ID)
 
 	s.store.SweepExpired()
 
 	var count int
-	s.store.db.QueryRow(`SELECT COUNT(*) FROM pastes WHERE id=?`, created.ID).Scan(&count)
+	count = s.store.QueryInt(`SELECT COUNT(*) FROM pastes WHERE id=?`, created.ID)
 	if count != 0 {
 		t.Fatal("expected hard delete after grace period")
 	}
@@ -202,9 +202,9 @@ func TestSweepSoftDeletesAfterGrace(t *testing.T) {
 
 func TestSlugCharset(t *testing.T) {
 	for i := 0; i < 100; i++ {
-		s := genSlug(6)
+		s := store.GenSlug(6)
 		for _, c := range s {
-			if !strings.ContainsRune(slugAlphabet, c) {
+			if !strings.ContainsRune(store.SlugAlphabet, c) {
 				t.Fatalf("bad char %q in slug %q", c, s)
 			}
 		}

internal/api/mine_test.go

@@ -1,6 +1,9 @@
-package main
+package api
 
 import (
+	"palette/internal/store"
+	"palette/internal/web"
+
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
@@ -40,20 +43,19 @@ func viewerCookieFor(t *testing.T, h http.Handler, path string) string {
 
 func TestMineCreateListDelete(t *testing.T) {
 	globalLimiter = newLimiter() // fresh rate-limit buckets
-	webUI, err := NewWebUI()
+	st, err := store.OpenStore(":memory:")
 	if err != nil {
 		t.Fatal(err)
 	}
-	webUIInstance = webUI
-	store, err := OpenStore(":memory:")
+	ui, err := web.New()
 	if err != nil {
 		t.Fatal(err)
 	}
 	cfg := Config{MaxTextBytes: 5 * 1024 * 1024}
-	ss := newTestSettingsStore(t, cfg)
+	ss := NewTestSettingsStore(t, cfg)
 	globalSettingsFn = ss.get
 	t.Cleanup(func() { globalSettingsFn = nil })
-	a := &apiServer{store: store, cfg: cfg, settings: ss, adminKey: "test-admin-key"}
+	a := &apiServer{store: st, cfg: cfg, ui: ui, settings: ss, adminKey: "test-admin-key"}
 	h := a.routes()
 
 	alice := viewerCookieFor(t, h, "/history")

internal/api/pentest_cookie_test.go

@@ -1,4 +1,4 @@
-package main
+package api
 
 import (
 	"encoding/json"

internal/api/pentest_helpers_test.go

@@ -1,4 +1,4 @@
-package main
+package api
 
 import (
 	"encoding/json"

internal/api/pentest_rawct_test.go

@@ -1,4 +1,4 @@
-package main
+package api
 
 import (
 	"net/http/httptest"

internal/api/ratelimit.go

@@ -1,4 +1,4 @@
-package main
+package api
 
 import (
 	"net/http"
@@ -70,8 +70,7 @@ func globalSettings() Settings {
 }
 
 // rateLimitCreate uses the admin-tunable burst and per-minute refill (#40).
-func rateLimitCreate(r *http.Request) bool {
-	s := globalSettings()
+func rateLimitCreate(r *http.Request, s Settings) bool {
 	return globalLimiter.allow("create:"+clientIP(r), s.RateLimitPerMinute/60.0, s.RateLimitBurst)
 }
 

internal/api/ratelimit_test.go

@@ -1,6 +1,10 @@
-package main
+package api
 
 import (
+	"palette/internal/lang"
+	"palette/internal/store"
+	"palette/internal/web"
+
 	"bytes"
 	"encoding/json"
 	"net/http"
@@ -12,22 +16,19 @@ import (
 func newTestServer(t *testing.T) *apiServer {
 	t.Helper()
 	globalLimiter = newLimiter() // fresh buckets per test
-	store, err := OpenStore(t.TempDir() + "/test.db")
+	st, err := store.OpenStore(t.TempDir() + "/test.db")
 	if err != nil {
 		t.Fatal(err)
 	}
-	if webUIInstance == nil {
-		ui, err := NewWebUI()
-		if err != nil {
-			t.Fatal(err)
-		}
-		webUIInstance = ui
+	ui, err := web.New()
+	if err != nil {
+		t.Fatal(err)
 	}
 	cfg := Config{MaxTextBytes: 1024 * 1024}
-	ss := newTestSettingsStore(t, cfg)
+	ss := NewTestSettingsStore(t, cfg)
 	globalSettingsFn = ss.get
 	t.Cleanup(func() { globalSettingsFn = nil })
-	return &apiServer{store: store, cfg: cfg, settings: ss, adminKey: "test-admin-key"}
+	return &apiServer{store: st, cfg: cfg, ui: ui, settings: ss, adminKey: "test-admin-key"}
 }
 
 func postJSON(t *testing.T, h http.Handler, path string, body any) *httptest.ResponseRecorder {
@@ -150,7 +151,7 @@ func TestRateLimitUnlock(t *testing.T) {
 // TestHighlightCode basic expectations.
 func TestHighlightCode(t *testing.T) {
 	in := "func main() {\n\t// comment\n\tfmt.Println(\"hello\")\n}\n"
-	out := highlightCode(in, "go")
+	out := lang.HighlightCode(in, "go")
 	if !bytes.Contains([]byte(out), []byte(`<span class="tok-kw">func</span>`)) {
 		t.Fatalf("no keyword span: %s", out)
 	}
@@ -161,12 +162,12 @@ func TestHighlightCode(t *testing.T) {
 		t.Fatalf("no string span: %s", out)
 	}
 	// unsupported language returns escaped plain text
-	plain := highlightCode("<b>x</b>", "text")
+	plain := lang.HighlightCode("<b>x</b>", "text")
 	if plain != "&lt;b&gt;x&lt;/b&gt;" {
 		t.Fatalf("plain escaping wrong: %q", plain)
 	}
 	// line count preserved (gutter alignment)
-	if got := len(splitLines(highlightCode("a\nb\nc", "go"))); got != 3 {
+	if got := len(splitLines(lang.HighlightCode("a\nb\nc", "go"))); got != 3 {
 		t.Fatalf("want 3 lines, got %d", got)
 	}
 }

internal/api/server.go

@@ -0,0 +1,421 @@
+// Package api implements palette's REST handlers and the HTTP router:
+// pastes, cans, guess-language, rate limiting middleware, and the admin API.
+package api
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+
+	"database/sql"
+
+	"palette/internal/store"
+	"palette/internal/web"
+)
+
+type Config struct {
+	Addr         string
+	DBPath       string
+	MaxTextBytes int64
+	MaxItemBytes int64
+}
+
+type apiServer struct {
+	store       *store.Store
+	cfg         Config
+	ui          *web.UI
+	settings    *settingsStore
+	adminKey    string
+}
+
+func NewServer(st *store.Store, cfg Config, ui *web.UI, ss *settingsStore, adminKey string) *apiServer {
+	return &apiServer{store: st, cfg: cfg, ui: ui, settings: ss, adminKey: adminKey}
+}
+
+func writeJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	json.NewEncoder(w).Encode(v)
+}
+
+func writeErr(w http.ResponseWriter, status int, msg string) {
+	writeJSON(w, status, map[string]string{"error": msg})
+}
+
+// Routes returns the HTTP handler for the server.
+func (a *apiServer) Routes() http.Handler {
+	return a.routes()
+}
+
+func (a *apiServer) routes() http.Handler {
+	r := chi.NewRouter()
+	r.Use(middleware.Recoverer)
+	r.Use(middleware.Timeout(30 * time.Second))
+	r.Use(viewerCookieMiddleware)
+
+	// admin (#40): HTML page is open (key entry via form); API is key-guarded
+	r.Get("/admin", a.ui.Handlers().HandleAdminPage)
+	r.Get("/admin/api/settings", a.adminAuth(a.handleAdminGetSettings, a.adminKey))
+	r.Post("/admin/api/settings", a.adminAuth(a.handleAdminPostSettings, a.adminKey))
+
+	// API
+	r.Route("/api", func(r chi.Router) {
+		r.Post("/pastes", a.handleCreatePaste)
+		r.Get("/pastes/{id}", a.handleGetPaste)
+		r.Delete("/pastes/{id}", a.handleDeletePaste)
+		r.Get("/mine", a.handleListMine)
+		r.Delete("/pastes/{id}/redeem", a.handleRedeemDeletion)
+		r.Get("/public", a.handleListPublic)
+		r.Post("/guess-language", a.handleGuessLang)
+		r.Post("/pastes/can", a.handleCreateCan)
+		r.Get("/cans/{id}", a.handleGetCan)
+		r.Get("/cans/{id}/items/{item}", a.handleCanItem)
+	})
+
+	// can page
+	r.Get("/can/{id}", a.handleCanPage)
+
+	// raw
+	r.Get("/raw/{id}", a.handleRaw)
+
+	// web pages
+	r.Get("/", http.RedirectHandler("/history", http.StatusFound).ServeHTTP)
+	r.Get("/new", a.ui.Handlers().HandleNewPage)
+	r.Get("/history", a.ui.Handlers().HandleHistoryPage)
+	r.Get("/settings", a.ui.Handlers().HandleSettingsPage)
+	r.Get("/mine", a.ui.Handlers().HandleMinePage)
+	r.Handle("/static/*", a.ui.StaticHandler())
+	r.Get("/unlock/{id}", a.handlePasteView)
+	r.Post("/unlock/{id}", a.handlePasteView)
+	r.Get("/{id}", a.handlePasteView)
+	r.Post("/{id}", a.handlePasteView)
+
+	r.NotFound(func(w http.ResponseWriter, r *http.Request) {
+		writeErr(w, 404, "not found")
+	})
+	return r
+}
+
+// viewerCookieMiddleware ensures every request carries an anonymous browser id
+// cookie ("vwr"); sets one on the response if absent. Used by /mine (#37, #49).
+func viewerCookieMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if c, err := r.Cookie("vwr"); err != nil || c.Value == "" {
+			id := store.GenSlug(16)
+			http.SetCookie(w, &http.Cookie{
+				Name: "vwr", Value: id, Path: "/",
+				MaxAge: 31536000, HttpOnly: true, SameSite: http.SameSiteLaxMode,
+			})
+			r.AddCookie(&http.Cookie{Name: "vwr", Value: id})
+			// remember that this cookie was minted here, not sent by the client
+			r = r.WithContext(context.WithValue(r.Context(), vwrMintedKey, true))
+		}
+		next.ServeHTTP(w, r)
+	})
+}
+
+type vwrMintedKeyType struct{}
+
+var vwrMintedKey vwrMintedKeyType
+
+func currentViewerID(r *http.Request) string {
+	if c, err := r.Cookie("vwr"); err == nil {
+		return c.Value
+	}
+	return ""
+}
+
+// viewerSentCookie reports whether the client itself sent a vwr cookie
+// (as opposed to the middleware minting one for this request).
+func viewerSentCookie(r *http.Request) bool {
+	if _, err := r.Cookie("vwr"); err != nil {
+		return false
+	}
+	_, minted := r.Context().Value(vwrMintedKey).(bool)
+	return !minted
+}
+
+func (a *apiServer) handleCreatePaste(w http.ResponseWriter, r *http.Request) {
+	s := a.settings.get()
+	setRateLimitHeaders(w, 1, 5)
+	if !rateLimitCreate(r, s) {
+		writeRateLimited(w, 1)
+		return
+	}
+	var p store.Paste
+	if err := json.NewDecoder(r.Body).Decode(&p); err != nil {
+		writeErr(w, 400, "invalid json body")
+		return
+	}
+	if strings.TrimSpace(p.Content) == "" {
+		writeErr(w, 400, "content is required")
+		return
+	}
+	if int64(len(p.Content)) > s.MaxContentBytes { // #40: admin-tunable
+		writeErr(w, 413, fmt.Sprintf("content exceeds max %d bytes", s.MaxContentBytes))
+		return
+	}
+	// #40: admin-configurable default expiry
+	if (p.ExpiresIn == nil || *p.ExpiresIn == "") && s.DefaultExpiry != "" {
+		def := s.DefaultExpiry
+		p.ExpiresIn = &def
+	}
+	p.ViewerID = currentViewerID(r)
+	created, err := a.store.CreatePaste(&p)
+	if err != nil {
+		writeErr(w, 400, err.Error())
+		return
+	}
+	writeJSON(w, 201, map[string]any{
+		"id":             created.ID,
+		"deletion_token": created.DeletionToken,
+		"url":            "/" + created.ID,
+		"raw_url":        "/raw/" + created.ID,
+		"api_url":        "/api/pastes/" + created.ID,
+		"expires_at":     created.ExpiresAt,
+		"created_at":     created.CreatedAt,
+		"rate_limit":     map[string]int{"create_per_sec": 1, "burst": 5},
+	})
+}
+
+func (a *apiServer) handleGetPaste(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	row, err := a.store.GetPaste(id)
+	if err != nil {
+		writeErr(w, 500, "db error")
+		return
+	}
+	if row == nil {
+		writeErr(w, 404, "paste not found")
+		return
+	}
+	if row.ExpiresAt.Valid && row.ExpiresAt.Int64 < time.Now().Unix() {
+		writeErr(w, 404, "paste expired")
+		return
+	}
+	if row.Burned() { // #49: read budget exhausted
+		writeErr(w, 404, "paste not found")
+		return
+	}
+	if row.PasswordHash.Valid {
+		// require password via header or query
+		pw := r.Header.Get("X-Paste-Password")
+		if pw == "" {
+			pw = r.URL.Query().Get("password")
+		}
+		if pw == "" || !store.CheckPassword(row.PasswordHash.String, pw) {
+			writeErr(w, 401, "password required")
+			return
+		}
+	}
+	rem, _ := a.store.RegisterRead(row, currentViewerID(r), a.burnViewerWindow()) // #49 (also covers legacy burn)
+	writeJSON(w, 200, map[string]any{
+		"id": row.ID, "content": row.Content, "content_type": row.ContentType,
+		"language": store.NullStrPtr(row.Language), "title": store.NullStrPtr(row.Title), "created_at": row.CreatedAt,
+		"view_count": row.ViewCount, "visibility": row.Visibility,
+		"reads_remaining": rem,
+	})
+}
+
+func (a *apiServer) handleDeletePaste(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	row, err := a.store.GetPaste(id)
+	if err != nil || row == nil {
+		writeErr(w, 404, "paste not found")
+		return
+	}
+	// viewer-cookie delete enforcement (#37): only the browser that created
+	// the paste (matching vwr) may delete it via this endpoint. Requests with
+	// no client-sent vwr cookie (plain API clients) are unaffected.
+	vid := currentViewerID(r)
+	if vid != "" && viewerSentCookie(r) && row.ViewerID.Valid && row.ViewerID.String != "" && row.ViewerID.String != vid {
+		writeErr(w, 403, "not your paste")
+		return
+	}
+	if err := a.store.SoftDelete(row.ID); err != nil {
+		writeErr(w, 500, "db error")
+		return
+	}
+	writeJSON(w, 200, map[string]string{"status": "soft-deleted"})
+}
+
+// handleListMine serves /api/mine: pastes created from this browser (#37).
+func (a *apiServer) handleListMine(w http.ResponseWriter, r *http.Request) {
+	vid := currentViewerID(r)
+	if vid == "" {
+		writeJSON(w, 200, map[string]any{"total": 0, "items": []any{}})
+		return
+	}
+	limit, _ := strconv.Atoi(r.URL.Query().Get("limit"))
+	if limit <= 0 || limit > 100 {
+		limit = 50
+	}
+	offset, _ := strconv.Atoi(r.URL.Query().Get("offset"))
+	rows, total, err := a.store.ListMine(vid, limit, offset)
+	if err != nil {
+		writeErr(w, 500, "db error")
+		return
+	}
+	items := make([]map[string]any, 0, len(rows))
+	for _, row := range rows {
+		lang, title := store.NullStrPtr(row.Language), store.NullStrPtr(row.Title)
+		items = append(items, map[string]any{
+			"id": row.ID, "title": title, "language": lang,
+			"created_at": row.CreatedAt, "view_count": row.ViewCount, "size": row.Size,
+			"custom_slug": store.NullStrPtr(row.CustomSlug), "visibility": row.Visibility,
+		})
+	}
+	writeJSON(w, 200, map[string]any{"total": total, "limit": limit, "offset": offset, "items": items})
+}
+
+func (a *apiServer) handleListPublic(w http.ResponseWriter, r *http.Request) {
+	limit, _ := strconv.Atoi(r.URL.Query().Get("limit"))
+	if limit <= 0 || limit > 100 {
+		limit = 25
+	}
+	offset, _ := strconv.Atoi(r.URL.Query().Get("offset"))
+	rows, total, err := a.store.ListPublic(limit, offset)
+	if err != nil {
+		writeErr(w, 500, "db error")
+		return
+	}
+	items := make([]map[string]any, 0, len(rows))
+	for _, row := range rows {
+		lang, title := store.NullStrPtr(row.Language), store.NullStrPtr(row.Title)
+		items = append(items, map[string]any{
+			"id": row.ID, "title": title, "language": lang,
+			"created_at": row.CreatedAt, "view_count": row.ViewCount, "size": row.Size,
+			"custom_slug": store.NullStrPtr(row.CustomSlug),
+		})
+	}
+	writeJSON(w, 200, map[string]any{"total": total, "limit": limit, "offset": offset, "items": items})
+}
+
+func (a *apiServer) handleRaw(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	row, err := a.store.GetPaste(id)
+	if err != nil || row == nil {
+		http.Error(w, "not found", 404)
+		return
+	}
+	if row.ExpiresAt.Valid && row.ExpiresAt.Int64 < time.Now().Unix() {
+		http.Error(w, "paste expired", 404)
+		return
+	}
+	if row.PasswordHash.Valid {
+		http.Error(w, "password required", 401)
+		return
+	}
+	if row.Burned() { // #49: read budget exhausted
+		http.Error(w, "not found", 404)
+		return
+	}
+	// #49 decision: raw reads count against the read budget too, with the
+	// same per-viewer dedupe window as page views.
+	a.store.RegisterRead(row, currentViewerID(r), a.burnViewerWindow())
+	// #34: content_type is attacker-controlled via the create API. Serving it
+	// verbatim let a paste be stored with text/html (or image/svg+xml) and
+	// render as active content on this origin when fetched from /raw —
+	// stored XSS. Only pass through a fixed safe set; anything else is
+	// served as plain text with nosniff.
+	ct := row.ContentType
+	if !safeRawContentType(ct) {
+		ct = "text/plain; charset=utf-8"
+	}
+	w.Header().Set("Content-Type", ct)
+	w.Header().Set("X-Content-Type-Options", "nosniff")
+	a.store.IncrementViews(row.ID)
+	w.Write([]byte(row.Content))
+}
+
+// safeRawContentType reports whether ct is in the fixed set of types that are
+// safe to serve verbatim on /raw (no active-content execution contexts).
+func safeRawContentType(ct string) bool {
+	base := ct
+	if i := strings.IndexByte(ct, ';'); i >= 0 {
+		base = ct[:i]
+	}
+	base = strings.ToLower(strings.TrimSpace(base))
+	switch base {
+	case "text/plain", "text/markdown", "text/x-markdown",
+		"application/json", "application/pdf",
+		"image/png", "image/jpeg", "image/gif", "image/webp",
+		"application/octet-stream":
+		return true
+	}
+	return false
+}
+
+func (a *apiServer) handleCanPage(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	can, err := a.store.GetCan(id)
+	if err != nil || can == nil {
+		http.NotFound(w, r)
+		return
+	}
+	items, _ := a.store.ListCanItems(can.ID)
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	fmt.Fprintf(w, "<!doctype html><html><head><title>can/%s — palette</title></head><body><h1>can/%s</h1><ul>", can.ID, can.ID)
+	for _, it := range items {
+		fmt.Fprintf(w, `<li><a href="/api/cans/%s/items/%s">%s</a> (%s)</li>`, can.ID, it.ID, templateEsc(nullStrOr(it.Title, it.ID)), it.ContentType)
+	}
+	fmt.Fprintf(w, "</ul></body></html>")
+}
+
+func templateEsc(s string) string {
+	r := strings.NewReplacer("&", "&amp;", "<", "&lt;", ">", "&gt;")
+	return r.Replace(s)
+}
+
+func (a *apiServer) handlePasteView(w http.ResponseWriter, r *http.Request) {
+	h := a.webHandlers()
+	// unlock POST rate limiting is wired through h.RateLimitOK
+	h.HandlePasteView(w, r)
+}
+
+func (a *apiServer) webHandlers() *web.Handlers {
+	return &web.Handlers{
+		UI:            a.ui,
+		Store:         a.store,
+		ViewerID:      currentViewerID,
+		BurnWindowMin: a.burnViewerWindow,
+		RateLimitOK:   func(id string, r *http.Request) bool { return rateLimitUnlock(id, r) },
+	}
+}
+
+func envOr(k, d string) string {
+	if v := os.Getenv(k); v != "" {
+		return v
+	}
+	return d
+}
+
+func envIntOr(k string, d int) int {
+	if v := os.Getenv(k); v != "" {
+		if n, err := strconv.Atoi(v); err == nil {
+			return n
+		}
+	}
+	return d
+}
+
+func nullStrOr(ns sql.NullString, def string) string {
+	if ns.Valid {
+		return ns.String
+	}
+	return def
+}
+
+// EnvOr returns the env var value or default.
+func EnvOr(k, d string) string { return envOr(k, d) }
+
+// EnvIntOr returns the env int value or default.
+func EnvIntOr(k string, d int) int { return envIntOr(k, d) }

internal/api/slugrelease_test.go

@@ -1,18 +1,19 @@
-package main
+package api
 
 import (
+	"palette/internal/store"
+
 	"testing"
 	"time"
 )
 
 // insertPasteWithSlug creates a paste directly with a custom slug and controlled
 // created_at/expires_at, bypassing the API's timestamp handling.
-func insertPasteWithSlug(t *testing.T, s *Store, slug string, createdAt, expiresAt int64) string {
+func insertPasteWithSlug(t *testing.T, s *store.Store, slug string, createdAt, expiresAt int64) string {
 	t.Helper()
-	id := genSlug(6)
-	_, err := s.db.Exec(`INSERT INTO pastes (id, custom_slug, content, content_type, created_at, expires_at)
-		VALUES (?, ?, ?, ?, ?, ?)`, id, slug, "x", "text/plain", createdAt, expiresAt)
-	if err != nil {
+	id := store.GenSlug(6)
+	if _, err := s.Exec(`INSERT INTO pastes (id, custom_slug, content, content_type, created_at, expires_at)
+		VALUES (?, ?, ?, ?, ?, ?)`, id, slug, "x", "text/plain", createdAt, expiresAt); err != nil {
 		t.Fatal(err)
 	}
 	return id
@@ -24,14 +25,14 @@ func TestReleaseSlugOnExpiredPaste(t *testing.T) {
 	s := testServer(t)
 	now := time.Now().Unix()
 	insertPasteWithSlug(t, s.store, "release-notes", now-3600, now-60)
-	if n, err := s.store.ReleaseCustomSlugs(); err != nil || n != 1 {
+	if n, err := s.store.ReleaseCustomSlugs(store.SlugReservationDays); err != nil || n != 1 {
 		t.Fatalf("released %d err %v, want 1", n, err)
 	}
 	if taken, _ := s.store.SlugTaken("release-notes"); taken {
 		t.Fatal("slug should be released after expiry")
 	}
 	// slug must be reusable by a new paste
-	p, err := s.store.CreatePaste(&Paste{Content: "new", CustomSlug: strPtr("release-notes")})
+	p, err := s.store.CreatePaste(&store.Paste{Content: "new", CustomSlug: strPtr("release-notes")})
 	if err != nil {
 		t.Fatalf("reuse slug: %v", err)
 	}
@@ -45,7 +46,7 @@ func TestReleaseSlugOnOldPaste(t *testing.T) {
 	now := time.Now().Unix()
 	// created 31 days ago, no expiry -> released by 30-day reservation rule
 	insertPasteWithSlug(t, s.store, "old-url", now-31*86400, 0)
-	if n, err := s.store.ReleaseCustomSlugs(); err != nil || n != 1 {
+	if n, err := s.store.ReleaseCustomSlugs(store.SlugReservationDays); err != nil || n != 1 {
 		t.Fatalf("released %d err %v, want 1", n, err)
 	}
 	if taken, _ := s.store.SlugTaken("old-url"); taken {
@@ -58,7 +59,7 @@ func TestKeepSlugOnRecentUnexpiredPaste(t *testing.T) {
 	now := time.Now().Unix()
 	insertPasteWithSlug(t, s.store, "fresh-url", now-3600, now+86400)
 	insertPasteWithSlug(t, s.store, "fresh-url2", now-3600, 0)
-	if n, err := s.store.ReleaseCustomSlugs(); err != nil || n != 0 {
+	if n, err := s.store.ReleaseCustomSlugs(store.SlugReservationDays); err != nil || n != 0 {
 		t.Fatalf("released %d err %v, want 0", n, err)
 	}
 	for _, slug := range []string{"fresh-url", "fresh-url2"} {
@@ -72,7 +73,7 @@ func TestSweeperTickerReleasesSlugs(t *testing.T) {
 	s := testServer(t)
 	now := time.Now().Unix()
 	insertPasteWithSlug(t, s.store, "ticker-url", now-7200, now-3600)
-	s.store.StartSweeper(10 * time.Millisecond)
+	s.store.StartSweeper(10*time.Millisecond, store.SlugReservationDays)
 	deadline := time.Now().Add(2 * time.Second)
 	for time.Now().Before(deadline) {
 		if taken, _ := s.store.SlugTaken("ticker-url"); !taken {

internal/api/sweep33_test.go

@@ -1,4 +1,4 @@
-package main
+package api
 
 import (
 	"net/http/httptest"
@@ -46,13 +46,6 @@ func TestCreatePasteExpiryBounds(t *testing.T) {
 // missing from handlePasteView, so the counter only moved on /raw.
 func TestPasteViewIncrementsViewCount(t *testing.T) {
 	s := testServer(t)
-	if webUIInstance == nil {
-		ui, err := NewWebUI()
-		if err != nil {
-			t.Fatal(err)
-		}
-		webUIInstance = ui
-	}
 	h := s.routes()
 
 	req := httptest.NewRequest("POST", "/api/pastes", strings.NewReader(`{"content":"vc"}`))
@@ -87,13 +80,6 @@ func TestPasteViewIncrementsViewCount(t *testing.T) {
 // view for the creator.
 func TestJustCreatedViewDoesNotCount(t *testing.T) {
 	s := testServer(t)
-	if webUIInstance == nil {
-		ui, err := NewWebUI()
-		if err != nil {
-			t.Fatal(err)
-		}
-		webUIInstance = ui
-	}
 	h := s.routes()
 
 	req := httptest.NewRequest("POST", "/api/pastes", strings.NewReader(`{"content":"jc"}`))

internal/lang/guess.go

@@ -1,8 +1,7 @@
-package main
+package lang
 
 import (
 	"encoding/json"
-	"net/http"
 	"regexp"
 	"strings"
 
@@ -58,7 +57,8 @@ var canonical = map[string]string{
 // paths (empty, JSON, unambiguous markers enry can't see without a filename),
 // then enry strategies (shebangs, XML decl, modelines, content heuristics),
 // then enry's classifier seeded by our regex hints.
-func guessLang(s string) string {
+// GuessLang detects a language from pasted content.
+func GuessLang(s string) string {
 	src := strings.TrimSpace(s)
 	if src == "" {
 		return ""
@@ -108,19 +108,3 @@ func normalizeLang(lang string) string {
 	return strings.ToLower(lang)
 }
 
-func (a *apiServer) handleGuessLang(w http.ResponseWriter, r *http.Request) {
-	setRateLimitHeaders(w, 1, 5)
-	if !rateLimitGuess(r) {
-		writeRateLimited(w, 1)
-		return
-	}
-	var req struct {
-		Content string `json:"content"`
-	}
-	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
-		writeErr(w, http.StatusBadRequest, "invalid json body")
-		return
-	}
-	lang := guessLang(req.Content)
-	writeJSON(w, http.StatusOK, map[string]any{"language": lang})
-}

internal/lang/guess_test.go

@@ -1,4 +1,4 @@
-package main
+package lang
 
 import (
 	"strings"
@@ -23,8 +23,8 @@ func TestGuessLangExisting(t *testing.T) {
 		"#!/bin/bash\nset -euo pipefail\necho hi\n":                           "bash",
 	}
 	for src, want := range cases {
-		if got := guessLang(src); got != want {
-			t.Errorf("guessLang(%q) = %q, want %q", src, got, want)
+		if got := GuessLang(src); got != want {
+			t.Errorf("GuessLang(%q) = %q, want %q", src, got, want)
 		}
 	}
 }
@@ -47,8 +47,8 @@ func TestGuessLangNewLanguages(t *testing.T) {
 		"diff --git a/main.go b/main.go\n--- a/main.go\n+++ b/main.go\n@@ -1 +1 @@\n": "diff",
 	}
 	for src, want := range cases {
-		if got := guessLang(src); got != want {
-			t.Errorf("guessLang(%q) = %q, want %q", src, got, want)
+		if got := GuessLang(src); got != want {
+			t.Errorf("GuessLang(%q) = %q, want %q", src, got, want)
 		}
 	}
 }
@@ -70,8 +70,8 @@ func TestGuessLangMagicMarkers(t *testing.T) {
 		"--- a/config.yml\n+++ b/config.yml\n@@ -1,2 +1,3 @@\n": "diff",
 	}
 	for src, want := range cases {
-		if got := guessLang(src); got != want {
-			t.Errorf("guessLang(%q) = %q, want %q", src, got, want)
+		if got := GuessLang(src); got != want {
+			t.Errorf("GuessLang(%q) = %q, want %q", src, got, want)
 		}
 	}
 }
@@ -79,14 +79,14 @@ func TestGuessLangMagicMarkers(t *testing.T) {
 // TestGuessLangCanonical verifies enry display names are mapped/lowercased to
 // our stored ids.
 func TestGuessLangCanonical(t *testing.T) {
-	if got := guessLang("FROM debian:12\nCMD [\"sh\"]\n"); got != "dockerfile" {
+	if got := GuessLang("FROM debian:12\nCMD [\"sh\"]\n"); got != "dockerfile" {
 		t.Errorf("Dockerfile canonical mapping failed: got %q", got)
 	}
-	if got := guessLang("#!/bin/sh\necho hi\n"); got != "bash" {
+	if got := GuessLang("#!/bin/sh\necho hi\n"); got != "bash" {
 		t.Errorf("Shell canonical mapping failed: got %q", got)
 	}
 	// uncurated languages still come back lowercase
-	if got := guessLang("<h1>{{.Name}}</h1>\n"); got != strings.ToLower(got) {
+	if got := GuessLang("<h1>{{.Name}}</h1>\n"); got != strings.ToLower(got) {
 		t.Errorf("expected lowercase output, got %q", got)
 	}
 }

internal/lang/highlight.go

@@ -1,4 +1,4 @@
-package main
+package lang
 
 import (
 	"html"
@@ -135,8 +135,8 @@ func containsStr(list []string, s string) bool {
 
 // highlightCode returns HTML with highlighting spans; safe because all
 // non-token text is html-escaped.
-func highlightCode(content, lang string) string {
-	l, h, ok := resolveLang(lang)
+func HighlightCode(content, langID string) string {
+	l, h, ok := resolveLang(langID)
 	_ = l
 	if !ok {
 		return html.EscapeString(content)
@@ -144,7 +144,7 @@ func highlightCode(content, lang string) string {
 	lines := strings.Split(content, "\n")
 	out := make([]string, len(lines))
 	for i, line := range lines {
-		out[i] = highlightLine(line, h, lang)
+		out[i] = highlightLine(line, h, langID)
 	}
 	return strings.Join(out, "\n")
 }

internal/store/burn.go

@@ -0,0 +1,71 @@
+package store
+
+import (
+	"crypto/subtle"
+	"database/sql"
+	"encoding/base64"
+	"time"
+)
+
+// genDeletionToken returns a 32-char url-safe random token
+func genDeletionToken() string {
+	b := make([]byte, 24)
+	cryptoRead(b)
+	return base64.RawURLEncoding.EncodeToString(b)
+}
+
+// TimeNow is overridable in tests to inject the clock.
+var TimeNow = time.Now
+
+// registerRead applies the burn-after-read budget for one view (#49).
+// For pastes with reads_limit set: the viewer's paste_views row is checked;
+// a view within the burn viewer window of the viewer's last view is deduped
+// (count=false). Otherwise reads_used is incremented, and the paste is
+// soft-deleted (burned) once reads_used reaches reads_limit. Viewers without
+// a cookie (plain API clients) count as their own viewer id "".
+// For legacy plain burn_after_read pastes (no reads_limit), any read burns.
+// Returns the number of reads remaining (0 when burned), or nil when no
+// budget is set. view_count is tracked separately and unaffected.
+func (s *Store) RegisterRead(row *PasteRow, viewerID string, burnWindowMinutes int) (remaining *int, count bool) {
+	if !row.ReadsLimit.Valid {
+		if row.BurnAfterRead {
+			s.SoftDelete(row.ID)
+			r := 0
+			return &r, true
+		}
+		return nil, false
+	}
+	now := TimeNow().Unix()
+	var last sql.NullInt64
+	s.db.QueryRow(`SELECT last_viewed FROM paste_views WHERE paste_id=? AND viewer_id=?`,
+		row.ID, viewerID).Scan(&last)
+	if last.Valid && now-last.Int64 < int64(burnWindowMinutes)*60 {
+		r := int(row.ReadsLimit.Int64) - row.ReadsUsed
+		if r < 0 {
+			r = 0
+		}
+		return &r, false
+	}
+	s.db.Exec(`INSERT INTO paste_views (paste_id, viewer_id, last_viewed) VALUES (?,?,?)
+		ON CONFLICT(paste_id, viewer_id) DO UPDATE SET last_viewed = excluded.last_viewed`,
+		row.ID, viewerID, now)
+	used := row.ReadsUsed + 1
+	s.db.Exec(`UPDATE pastes SET reads_used=? WHERE id=?`, used, row.ID)
+	if int64(used) >= row.ReadsLimit.Int64 {
+		s.SoftDelete(row.ID)
+	}
+	r := int(row.ReadsLimit.Int64) - int(used)
+	if r < 0 {
+		r = 0
+	}
+	return &r, true
+}
+
+// Burned reports whether a read-limited paste has exhausted its budget.
+func (row *PasteRow) Burned() bool {
+	return row.ReadsLimit.Valid && int64(row.ReadsUsed) >= row.ReadsLimit.Int64
+}
+
+func DeletionTokenEqual(stored, given string) bool {
+	return subtle.ConstantTimeCompare([]byte(stored), []byte(given)) == 1
+}

internal/store/customslug.go

@@ -1,8 +1,7 @@
-package main
+package store
 
 import (
 	"errors"
-	"fmt"
 	"regexp"
 	"strings"
 )
@@ -16,16 +15,16 @@ var reservedSlugs = map[string]bool{
 	"new": true, "login": true, "logout": true, "admin": true, "settings": true,
 }
 
-var errInvalidSlug = errors.New("custom slug must be 1-64 chars: letters, digits, dash, underscore; must start with letter or digit")
-var errReservedSlug = errors.New("that slug is reserved")
-var errSlugTaken = errors.New("that slug is already taken")
+var ErrInvalidSlug = errors.New("custom slug must be 1-64 chars: letters, digits, dash, underscore; must start with letter or digit")
+var ErrReservedSlug = errors.New("that slug is reserved")
+var ErrSlugTaken = errors.New("that slug is already taken")
 
 func ValidateCustomSlug(slug string) error {
 	if !slugRE.MatchString(slug) {
-		return errInvalidSlug
+		return ErrInvalidSlug
 	}
 	if reservedSlugs[strings.ToLower(slug)] {
-		return errReservedSlug
+		return ErrReservedSlug
 	}
 	return nil
 }
@@ -45,5 +44,3 @@ func (s *Store) SlugTaken(slug string) (bool, error) {
 	}
 	return n > 0, nil
 }
-
-var _ = fmt.Sprintf // keep fmt if unused later

internal/store/password.go

@@ -1,4 +1,4 @@
-package main
+package store
 
 import (
 	"crypto/rand"
@@ -19,7 +19,8 @@ const (
 	argonSaltLen = 16
 )
 
-func argon2idHash(pw string) (string, error) {
+// Argon2IDHash hashes a password with argon2id.
+func Argon2IDHash(pw string) (string, error) {
 	salt := make([]byte, argonSaltLen)
 	if _, err := rand.Read(salt); err != nil {
 		return "", err
@@ -27,11 +28,10 @@ func argon2idHash(pw string) (string, error) {
 	key := argon2.IDKey([]byte(pw), salt, argonTime, argonMemory, argonThreads, argonKeyLen)
 	return fmt.Sprintf("$argon2id$v=19$m=%d,t=%d,p=%d$%s$%s",
 		argonMemory, argonTime, argonThreads,
-		base64.RawStdEncoding.EncodeToString(salt),
-		base64.RawStdEncoding.EncodeToString(key)), nil
+		base64.RawStdEncoding.EncodeToString(salt), base64.RawStdEncoding.EncodeToString(key)), nil
 }
 
-func checkPassword(hash, pw string) bool {
+func CheckPassword(hash, pw string) bool {
 	parts := strings.Split(hash, "$")
 	if len(parts) != 6 || parts[1] != "argon2id" {
 		return false

internal/store/store.go

@@ -0,0 +1,463 @@
+// Package store provides the SQLite persistence layer for palette: schema
+// migrations, the Store type and all queries, and the background sweeper.
+package store
+
+import (
+	"database/sql"
+	"errors"
+	"fmt"
+	"log"
+	"time"
+
+	_ "modernc.org/sqlite"
+)
+
+// SlugReservationDays is the default custom-URL reservation window (admin-tunable via settings, #40).
+const SlugReservationDays = 30
+
+// SoftDeleteGraceDays is how long soft-deleted pastes linger before hard delete.
+const SoftDeleteGraceDays = 7
+
+type Paste struct {
+	ID          string  `json:"id"`
+	CustomSlug  *string `json:"custom_slug,omitempty"`
+	Content     string  `json:"content"`
+	ContentType string  `json:"content_type"`
+	Language    *string `json:"language,omitempty"`
+	Title       *string `json:"title,omitempty"`
+	Password    *string `json:"password,omitempty"`
+	ExpiresIn   *string `json:"expires_in,omitempty"`
+	BurnAfterRead bool  `json:"burn_after_read,omitempty"`
+	BurnAfterReads *int `json:"burn_after_reads,omitempty"` // #49: readable N times (default 1)
+	Visibility  string  `json:"visibility"`
+	CanID       *string `json:"can_id,omitempty"`
+	CreatedAt   int64   `json:"created_at"`
+	DeletedAt   *int64  `json:"deleted_at,omitempty"`
+	ExpiresAt   *int64  `json:"expires_at,omitempty"`
+	ViewerID    string  `json:"-"` // set from vwr cookie server-side (#37)
+	readsLimit  *int64  // #49: resolved read budget, not serialized
+	ViewCount   int     `json:"view_count"`
+	DeletionToken string `json:"-"`
+}
+
+type PasteRow struct {
+	ID            string
+	CustomSlug    sql.NullString
+	Content       string
+	ContentType   string
+	Language      sql.NullString
+	Title         sql.NullString
+	PasswordHash  sql.NullString
+	ExpiresAt     sql.NullInt64
+	BurnAfterRead bool
+	ReadsLimit    sql.NullInt64
+	ReadsUsed     int
+	Visibility    string
+	CanID         sql.NullString
+	CreatedAt     int64
+	DeletedAt     sql.NullInt64
+	ViewCount     int
+	Size          int
+	DeletionToken sql.NullString
+	ViewerID      sql.NullString
+}
+
+type CanRow struct {
+	ID           string
+	Title        sql.NullString
+	Visibility   string
+	PasswordHash sql.NullString
+	CreatedAt    int64
+	DeletedAt    sql.NullInt64
+	ExpiresAt    sql.NullInt64
+}
+
+type Store struct {
+	db *sql.DB
+}
+
+func OpenStore(path string) (*Store, error) {
+	db, err := sql.Open("sqlite", path+"?_pragma=journal_mode(WAL)&_pragma=busy_timeout(5000)")
+	if err != nil {
+		return nil, err
+	}
+	s := &Store{db: db}
+	if err := s.migrate(); err != nil {
+		return nil, err
+	}
+	return s, nil
+}
+
+func (s *Store) migrate() error {
+	_, err := s.db.Exec(`
+	CREATE TABLE IF NOT EXISTS pastes (
+		id            TEXT PRIMARY KEY,
+		custom_slug   TEXT UNIQUE,
+		content       TEXT NOT NULL,
+		content_type  TEXT NOT NULL DEFAULT 'text/plain',
+		language      TEXT,
+		title         TEXT,
+		password_hash TEXT,
+		expires_at    INTEGER,
+		burn_after_read INTEGER DEFAULT 0,
+		visibility    TEXT NOT NULL DEFAULT 'public',
+		can_id        TEXT,
+		created_at    INTEGER NOT NULL,
+		deleted_at    INTEGER,
+		view_count    INTEGER NOT NULL DEFAULT 0,
+deletion_token TEXT
+	);
+	CREATE INDEX IF NOT EXISTS idx_pastes_visibility_created ON pastes(visibility, created_at DESC);
+	CREATE INDEX IF NOT EXISTS idx_pastes_expires ON pastes(expires_at) WHERE expires_at IS NOT NULL;
+	CREATE INDEX IF NOT EXISTS idx_pastes_deleted ON pastes(deleted_at) WHERE deleted_at IS NOT NULL;
+	CREATE TABLE IF NOT EXISTS paste_cans (
+		id            TEXT PRIMARY KEY,
+		title         TEXT,
+		description   TEXT,
+		visibility    TEXT NOT NULL DEFAULT 'public',
+		password_hash TEXT,
+		created_at    INTEGER NOT NULL,
+		deleted_at    INTEGER,
+		expires_at    INTEGER
+	);
+	`)
+	s.db.Exec(`ALTER TABLE pastes ADD COLUMN deletion_token TEXT`) // ignore if exists
+	s.db.Exec(`ALTER TABLE pastes ADD COLUMN viewer_id TEXT`)     // ignore if exists (#37)
+	s.db.Exec(`ALTER TABLE pastes ADD COLUMN reads_limit INTEGER`)          // ignore if exists (#49)
+	s.db.Exec(`ALTER TABLE pastes ADD COLUMN reads_used INTEGER DEFAULT 0`) // ignore if exists (#49)
+	s.db.Exec(`CREATE TABLE IF NOT EXISTS paste_views (
+		paste_id    TEXT NOT NULL,
+		viewer_id   TEXT NOT NULL,
+		last_viewed INTEGER NOT NULL,
+		PRIMARY KEY (paste_id, viewer_id)
+	)`) // #49: per-viewer read dedupe window
+	return err
+}
+
+// SlugAlphabet is the paste-id charset (no ambiguous chars).
+var SlugAlphabet = "23456789abcdefghjkmnpqrstuvwxyz"
+
+// genSlug generates a random slug of length n.
+func genSlug(n int) string {
+	b := make([]byte, n)
+	_, _ = cryptoRead(b)
+	for i := range b {
+		b[i] = SlugAlphabet[int(b[i])%len(SlugAlphabet)]
+	}
+	return string(b)
+}
+
+// validExpiry reports whether an expires_in duration is in the accepted
+// window. The UI restricts presets to 1 minute - 1 year (#48); the API must
+// enforce the same bounds, otherwise negative/zero/absurd durations create
+// pastes that are born expired (or effectively permanent).
+const (
+	minExpiry = time.Minute
+	maxExpiry = 366 * 24 * time.Hour // 1 year (+ leap day headroom)
+)
+
+func ValidExpiry(d time.Duration) bool {
+	return d >= minExpiry && d <= maxExpiry
+}
+
+func (s *Store) CreatePaste(p *Paste) (*Paste, error) {
+	id := genSlug(6)
+	now := time.Now().Unix()
+
+	var expiresAt *int64
+	if p.ExpiresIn != nil && *p.ExpiresIn != "" {
+		d, err := time.ParseDuration(*p.ExpiresIn)
+		if err != nil {
+			return nil, fmt.Errorf("invalid expires_in: %w", err)
+		}
+		if !ValidExpiry(d) {
+			return nil, fmt.Errorf("expires_in must be between 1 minute and 1 year")
+		}
+		t := now + int64(d.Seconds())
+		expiresAt = &t
+	}
+
+	var pwHash *string
+	if p.Password != nil && *p.Password != "" {
+		h, err := Argon2IDHash(*p.Password)
+		if err != nil {
+			return nil, err
+		}
+		pwHash = &h
+	}
+
+	if p.CustomSlug != nil && *p.CustomSlug != "" {
+		slug := *p.CustomSlug
+		if err := ValidateCustomSlug(slug); err != nil {
+			return nil, err
+		}
+		taken, err := s.SlugTaken(slug)
+		if err != nil {
+			return nil, err
+		}
+		if taken {
+			return nil, ErrSlugTaken
+		}
+	}
+
+	// #49: burn-after-read pastes carry a read budget (default 1 read)
+	if p.BurnAfterRead {
+		limit := int64(1)
+		if p.BurnAfterReads != nil && *p.BurnAfterReads > 0 {
+			limit = int64(*p.BurnAfterReads)
+		}
+		p.readsLimit = &limit
+	}
+
+	visibility := p.Visibility
+	if visibility == "" {
+		visibility = "public"
+	}
+	if visibility != "public" && visibility != "unlisted" {
+		return nil, errors.New("visibility must be public or unlisted")
+	}
+
+	contentType := p.ContentType
+	if contentType == "" {
+		contentType = "text/plain"
+	}
+
+	var slugVal *string
+	if p.CustomSlug != nil && *p.CustomSlug != "" {
+		slugVal = p.CustomSlug
+	}
+	p.DeletionToken = genDeletionToken()
+	_, err := s.db.Exec(`INSERT INTO pastes
+		(id, custom_slug, content, content_type, language, title, password_hash, expires_at, burn_after_read, visibility, created_at, deletion_token, viewer_id, reads_limit)
+		VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?)`,
+		id, slugVal, p.Content, contentType, p.Language, p.Title, pwHash, expiresAt, boolToInt(p.BurnAfterRead), visibility, now, p.DeletionToken, p.ViewerID, p.readsLimit)
+	if err != nil {
+		return nil, err
+	}
+	p.ID = id
+	p.CreatedAt = now
+	p.ExpiresAt = expiresAt
+	p.Visibility = visibility
+	return p, nil
+}
+
+func (s *Store) GetPaste(idOrSlug string) (*PasteRow, error) {
+	row := s.db.QueryRow(`SELECT id, custom_slug, content, content_type, language, title, password_hash, expires_at, burn_after_read, visibility, can_id, created_at, deleted_at, view_count, deletion_token, viewer_id, reads_limit, COALESCE(reads_used, 0)
+		FROM pastes WHERE (id = ? OR custom_slug = ?) AND deleted_at IS NULL`, idOrSlug, idOrSlug)
+	var r PasteRow
+	err := row.Scan(&r.ID, &r.CustomSlug, &r.Content, &r.ContentType, &r.Language, &r.Title, &r.PasswordHash, &r.ExpiresAt, &r.BurnAfterRead, &r.Visibility, &r.CanID, &r.CreatedAt, &r.DeletedAt, &r.ViewCount, &r.DeletionToken, &r.ViewerID, &r.ReadsLimit, &r.ReadsUsed)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return &r, err
+}
+
+func (s *Store) ListPublic(limit, offset int) ([]PasteRow, int, error) {
+	rows, err := s.db.Query(`SELECT id, custom_slug, content_type, language, title, visibility, created_at, view_count, LENGTH(content) FROM pastes
+		WHERE visibility='public' AND deleted_at IS NULL AND can_id IS NULL AND (expires_at IS NULL OR expires_at > ?)
+		ORDER BY created_at DESC LIMIT ? OFFSET ?`, time.Now().Unix(), limit, offset)
+	if err != nil {
+		return nil, 0, err
+	}
+	defer rows.Close()
+	var out []PasteRow
+	for rows.Next() {
+		var r PasteRow
+		var cs, lang, title sql.NullString
+		if err := rows.Scan(&r.ID, &cs, &r.ContentType, &lang, &title, &r.Visibility, &r.CreatedAt, &r.ViewCount, &r.Size); err != nil {
+			return nil, 0, err
+		}
+		r.CustomSlug = cs
+		r.Language = lang
+		r.Title = title
+		out = append(out, r)
+	}
+	var total int
+	s.db.QueryRow(`SELECT COUNT(*) FROM pastes WHERE visibility='public' AND deleted_at IS NULL AND can_id IS NULL AND (expires_at IS NULL OR expires_at > ?)`, time.Now().Unix()).Scan(&total)
+	return out, total, nil
+}
+
+// ListMine lists pastes created from the given viewer id (browser cookie), newest first.
+func (s *Store) ListMine(viewerID string, limit, offset int) ([]PasteRow, int, error) {
+	rows, err := s.db.Query(`SELECT id, custom_slug, language, title, visibility, created_at, view_count, LENGTH(content)
+		FROM pastes
+		WHERE viewer_id = ? AND deleted_at IS NULL AND can_id IS NULL AND (expires_at IS NULL OR expires_at > ?)
+		ORDER BY created_at DESC LIMIT ? OFFSET ?`, viewerID, time.Now().Unix(), limit, offset)
+	if err != nil {
+		return nil, 0, err
+	}
+	defer rows.Close()
+	var out []PasteRow
+	for rows.Next() {
+		var r PasteRow
+		var cs, lang, title sql.NullString
+		if err := rows.Scan(&r.ID, &cs, &lang, &title, &r.Visibility, &r.CreatedAt, &r.ViewCount, &r.Size); err != nil {
+			return nil, 0, err
+		}
+		r.CustomSlug, r.Language, r.Title = cs, lang, title
+		out = append(out, r)
+	}
+	var total int
+	s.db.QueryRow(`SELECT COUNT(*) FROM pastes
+		WHERE viewer_id = ? AND deleted_at IS NULL AND can_id IS NULL AND (expires_at IS NULL OR expires_at > ?)`,
+		viewerID, time.Now().Unix()).Scan(&total)
+	return out, total, nil
+}
+
+// MineOwner returns the stored viewer_id for a paste, or "" if none.
+func (s *Store) MineOwner(id string) (string, error) {
+	var vid sql.NullString
+	err := s.db.QueryRow(`SELECT viewer_id FROM pastes WHERE id = ? AND deleted_at IS NULL`, id).Scan(&vid)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	if err != nil {
+		return "", err
+	}
+	if !vid.Valid {
+		return "", nil
+	}
+	return vid.String, nil
+}
+
+func (s *Store) SoftDelete(id string) error {
+	_, err := s.db.Exec(`UPDATE pastes SET deleted_at=? WHERE id=? AND deleted_at IS NULL`, time.Now().Unix(), id)
+	return err
+}
+
+func (s *Store) IncrementViews(id string) {
+	s.db.Exec(`UPDATE pastes SET view_count = view_count + 1 WHERE id = ?`, id)
+}
+
+// SweepExpired soft-deletes expired pastes and hard-deletes soft-deleted pastes past grace.
+func (s *Store) SweepExpired() {
+	now := time.Now().Unix()
+	s.db.Exec(`UPDATE pastes SET deleted_at=? WHERE expires_at IS NOT NULL AND expires_at < ? AND deleted_at IS NULL`, now, now)
+	grace := now - SoftDeleteGraceDays*86400
+	s.db.Exec(`DELETE FROM pastes WHERE deleted_at IS NOT NULL AND deleted_at < ?`, grace)
+}
+
+// ReleaseCustomSlugs frees custom URLs so they can be reused:
+//   - pastes whose expires_at has passed (expired or soft-deleted/expired),
+//   - pastes created more than reservationDays days ago (custom URLs are a
+//     reservation, not permanent).
+//
+// It returns the number of pastes whose custom_slug was released.
+func (s *Store) ReleaseCustomSlugs(reservationDays int) (int64, error) {
+	now := time.Now().Unix()
+	res, err := s.db.Exec(`UPDATE pastes SET custom_slug = NULL
+		WHERE custom_slug IS NOT NULL
+		  AND (expires_at IS NOT NULL AND expires_at > 0 AND expires_at < ?
+		   OR created_at < ?)`,
+		now, now-int64(reservationDays)*86400)
+	if err != nil {
+		return 0, err
+	}
+	n, _ := res.RowsAffected()
+	if n > 0 {
+		log.Printf("released %d custom slug(s)", n)
+	}
+	return n, nil
+}
+
+func (s *Store) StartSweeper(every time.Duration, reservationDays int) {
+	go func() {
+		t := time.NewTicker(every)
+		for range t.C {
+			s.SweepExpired()
+			s.ReleaseCustomSlugs(reservationDays)
+		}
+	}()
+}
+
+func boolToInt(b bool) int {
+	if b {
+		return 1
+	}
+	return 0
+}
+
+func NullStrPtr(ns sql.NullString) *string {
+	if ns.Valid {
+		return &ns.String
+	}
+	return nil
+}
+
+// HardDelete removes a paste row entirely (deletion-token redeem).
+func (s *Store) HardDelete(id string) {
+	s.db.Exec(`DELETE FROM pastes WHERE id = ?`, id)
+}
+
+// InsertCan creates a paste_can row.
+func (s *Store) InsertCan(canID, title, description, visibility string, pwHash *string, createdAt int64, expiresAt *int64) error {
+	_, err := s.db.Exec(`INSERT INTO paste_cans (id, title, description, visibility, password_hash, created_at, expires_at)
+		VALUES (?,?,?,?,?,?,?)`, canID, title, description, visibility, pwHash, createdAt, expiresAt)
+	return err
+}
+
+// DeleteCan removes an (empty/aborted) can row.
+func (s *Store) DeleteCan(canID string) {
+	s.db.Exec(`DELETE FROM paste_cans WHERE id=?`, canID)
+}
+
+// InsertCanItem adds an item paste belonging to a can.
+func (s *Store) InsertCanItem(canID, title, content, contentType string, language *string, expiresAt, binary *string, now int64) error {
+	// language/expiresAt unused here for now; content stored as text (binary-safe in sqlite)
+	_, err := s.db.Exec(`INSERT INTO pastes
+		(id, content, content_type, language, title, visibility, can_id, created_at)
+		VALUES (?,?,?,?,?,?,?,?)`,
+		genSlug(6), content, contentType, language, &title, "unlisted", canID, now)
+	_ = expiresAt
+	_ = binary
+	return err
+}
+
+func (s *Store) GetCan(id string) (*CanRow, error) {
+	row := s.db.QueryRow(`SELECT id, title, visibility, password_hash, created_at, deleted_at, expires_at
+		FROM paste_cans WHERE id = ? AND deleted_at IS NULL`, id)
+	var c CanRow
+	err := row.Scan(&c.ID, &c.Title, &c.Visibility, &c.PasswordHash, &c.CreatedAt, &c.DeletedAt, &c.ExpiresAt)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return &c, err
+}
+
+func (s *Store) ListCanItems(canID string) ([]PasteRow, error) {
+	rows, err := s.db.Query(`SELECT id, custom_slug, content, content_type, language, title, password_hash, expires_at, burn_after_read, visibility, can_id, created_at, deleted_at, view_count
+		FROM pastes WHERE can_id = ? AND deleted_at IS NULL ORDER BY created_at ASC`, canID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []PasteRow
+	for rows.Next() {
+		var r PasteRow
+		if err := rows.Scan(&r.ID, &r.CustomSlug, &r.Content, &r.ContentType, &r.Language, &r.Title, &r.PasswordHash, &r.ExpiresAt, &r.BurnAfterRead, &r.Visibility, &r.CanID, &r.CreatedAt, &r.DeletedAt, &r.ViewCount); err != nil {
+			return nil, err
+		}
+		out = append(out, r)
+	}
+	return out, nil
+}
+
+// GenSlug is the exported slug generator.
+func GenSlug(n int) string { return genSlug(n) }
+
+// Exec runs a raw statement (test helper).
+func (s *Store) Exec(query string, args ...any) (int64, error) {
+	res, err := s.db.Exec(query, args...)
+	if err != nil {
+		return 0, err
+	}
+	n, _ := res.RowsAffected()
+	return n, nil
+}
+
+// QueryInt runs a query returning a single integer (test helper).
+func (s *Store) QueryInt(query string, args ...any) int {
+	var n int
+	s.db.QueryRow(query, args...).Scan(&n)
+	return n
+}

internal/web/web.go

@@ -1,4 +1,6 @@
-package main
+// Package web serves palette's HTML routes: paste pages, cans, unlock, and
+// the admin page. Templates and static assets are embedded in this package.
+package web
 
 import (
 	"crypto/hmac"
@@ -12,32 +14,32 @@ import (
 	"log"
 	"net/http"
 	"os"
-	"strconv"
 	"strings"
 	"time"
 
-	"github.com/go-chi/chi/v5"
+	langpkg "palette/internal/lang"
+	"palette/internal/store"
 )
 
-//go:embed web/templates/*.html
+//go:embed templates/*.html
 var tmplFS embed.FS
 
-//go:embed web/static
+//go:embed static
 var staticFS embed.FS
 
-type webUI struct {
+type UI struct {
 	tmpl *template.Template
 }
 
-func NewWebUI() (*webUI, error) {
+func New() (*UI, error) {
 	funcs := template.FuncMap{
 		"humanSize": humanSize,
 	}
-	t, err := template.New("").Funcs(funcs).ParseFS(tmplFS, "web/templates/*.html")
+	t, err := template.New("").Funcs(funcs).ParseFS(tmplFS, "templates/*.html")
 	if err != nil {
 		return nil, err
 	}
-	return &webUI{tmpl: t}, nil
+	return &UI{tmpl: t}, nil
 }
 
 func humanSize(n int) string {
@@ -50,20 +52,18 @@ func humanSize(n int) string {
 	return fmt.Sprintf("%.1f MB", float64(n)/(1024*1024))
 }
 
-func staticHandler() http.Handler {
-	sub, _ := fs.Sub(staticFS, "web/static")
+func (u *UI) StaticHandler() http.Handler {
+	sub, _ := fs.Sub(staticFS, "static")
 	return http.StripPrefix("/static/", http.FileServer(http.FS(sub)))
 }
 
-func renderPage(w http.ResponseWriter, name string, data any) {
+func (h *Handlers) renderPage(w http.ResponseWriter, name string, data any) {
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
-	if err := webUIInstance.tmpl.ExecuteTemplate(w, name, data); err != nil {
+	if err := h.UI.tmpl.ExecuteTemplate(w, name, data); err != nil {
 		http.Error(w, "template error: "+err.Error(), 500)
 	}
 }
 
-var webUIInstance *webUI
-
 // #34: per-paste unlock tokens. unlockSecret is generated once at startup
 // (also derivable from PALETTE_UNLOCK_SECRET for multi-instance deploys) and
 // used to HMAC paste ids, so a client can only hold a valid pw_<id> cookie by
@@ -87,22 +87,6 @@ func unlockToken(id string) string {
 	return hex.EncodeToString(mac.Sum(nil))
 }
 
-func (a *apiServer) handleNewPage(w http.ResponseWriter, r *http.Request) {
-	renderPage(w, "new.html", map[string]any{"Page": "new"})
-}
-
-func (a *apiServer) handleHistoryPage(w http.ResponseWriter, r *http.Request) {
-	renderPage(w, "history.html", map[string]any{"Page": "history"})
-}
-
-func (a *apiServer) handleSettingsPage(w http.ResponseWriter, r *http.Request) {
-	renderPage(w, "settings.html", map[string]any{"Page": "settings"})
-}
-
-func (a *apiServer) handleMinePage(w http.ResponseWriter, r *http.Request) {
-	renderPage(w, "mine.html", map[string]any{"Page": "mine"})
-}
-
 func agoString(ts int64) string {
 	s := time.Now().Unix() - ts
 	switch {
@@ -129,7 +113,31 @@ func expiryString(expiresAt int64) string {
 	}
 }
 
-func (a *apiServer) renderPaste(w http.ResponseWriter, row *PasteRow, justCreated bool, deletionToken string, readsRemaining *int) {
+// Handlers is the set of store callbacks the web pages need. The web package
+// renders HTML; all queries go through the store.
+type Handlers struct {
+	UI            *UI
+	Store         *store.Store
+	ViewerID      func(r *http.Request) string
+	BurnWindowMin func() int
+	RateLimitOK   func(id string, r *http.Request) bool // per-paste unlock limiter
+}
+
+func (h *Handlers) rateLimitUnlock(id string, r *http.Request) bool {
+	if h.RateLimitOK != nil {
+		return h.RateLimitOK(id, r)
+	}
+	return true
+}
+
+func (h *Handlers) writeRateLimited(w http.ResponseWriter, retryAfterSecs int) {
+	w.Header().Set("Retry-After", fmt.Sprintf("%d", retryAfterSecs))
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(429)
+	w.Write([]byte(`{"error":"rate limit exceeded"}`))
+}
+
+func (h *Handlers) renderPaste(w http.ResponseWriter, row *store.PasteRow, justCreated bool, deletionToken string, readsRemaining *int) {
 	lines := strings.Count(row.Content, "\n") + 1
 	gutter := ""
 	for i := 1; i <= lines; i++ {
@@ -154,7 +162,7 @@ func (a *apiServer) renderPaste(w http.ResponseWriter, row *PasteRow, justCreate
 		"HasPassword":   row.PasswordHash.Valid,
 		"BurnAfterRead": row.BurnAfterRead,
 		"CustomSlug":    row.CustomSlug.String,
-		"ContentHTML":   template.HTML(highlightCode(row.Content, row.Language.String)), // safe: highlightCode escapes all non-span text
+		"ContentHTML":   template.HTML(langpkg.HighlightCode(row.Content, row.Language.String)), // safe: HighlightCode escapes all non-span text
 		"ContentAttr":   row.Content,
 		"Gutter":        strings.TrimSuffix(gutter, "\n"),
 		"LineCount":     lines,
@@ -167,18 +175,18 @@ func (a *apiServer) renderPaste(w http.ResponseWriter, row *PasteRow, justCreate
 		"ExpiresIn":     expIn,
 		"DeletionToken": deletionToken,
 		"ReadsLimit":    row.ReadsLimit.Valid,
-		"ReadsLeftN":    readsRemaining,   // *int: reads remaining after this view
+		"ReadsLeftN":    readsRemaining, // *int: reads remaining after this view
 		"ReadsTotal":    int(row.ReadsLimit.Int64),
 		"JustCreated":   justCreated,
 		"Host":          "this host",
 	}
-	renderPage(w, "paste.html", data)
+	h.renderPage(w, "paste.html", data)
 }
 
-// handlePastePage renders the paste view; supports both ID and custom slug.
-func (a *apiServer) handlePasteView(w http.ResponseWriter, r *http.Request) {
-	id := chi.URLParam(r, "id")
-	row, err := a.store.GetPaste(id)
+// HandlePasteView renders the paste view; supports both ID and custom slug.
+func (h *Handlers) HandlePasteView(w http.ResponseWriter, r *http.Request) {
+	id := r.PathValue("id")
+	row, err := h.Store.GetPaste(id)
 	if err != nil {
 		http.Error(w, "db error", 500)
 		return
@@ -194,13 +202,13 @@ func (a *apiServer) handlePasteView(w http.ResponseWriter, r *http.Request) {
 	if row.PasswordHash.Valid {
 		// if a password was submitted via unlock form, verify and set cookie for this paste
 		if r.Method == http.MethodPost {
-			if !rateLimitUnlock(row.ID, r) {
-				writeRateLimited(w, 60)
+			if !h.rateLimitUnlock(row.ID, r) {
+				h.writeRateLimited(w, 60)
 				return
 			}
 			r.ParseForm()
 			pw := r.FormValue("password")
-			if pw != "" && checkPassword(row.PasswordHash.String, pw) {
+			if pw != "" && store.CheckPassword(row.PasswordHash.String, pw) {
 				// #34: the unlock cookie must be bound to this specific paste and
 				// unforgable. A static value ("1") let anyone bypass the password
 				// by setting pw_<id>=1 for any paste id. The token is an HMAC of
@@ -217,16 +225,16 @@ func (a *apiServer) handlePasteView(w http.ResponseWriter, r *http.Request) {
 						return
 					}
 				}
-				a.renderPaste(w, row, false, "", nil)
+				h.renderPaste(w, row, false, "", nil)
 				return
 			}
-			renderPage(w, "unlock.html", map[string]any{"Page": "unlock", "ID": row.ID, "Wrong": true, "CreatedAgo": agoString(row.CreatedAt), "CreatedAtUnix": row.CreatedAt})
+			h.renderPage(w, "unlock.html", map[string]any{"Page": "unlock", "ID": row.ID, "Wrong": true, "CreatedAgo": agoString(row.CreatedAt), "CreatedAtUnix": row.CreatedAt})
 			return
 		}
 		// check cookie — must carry the valid per-paste unlock token (#34)
 		c, err := r.Cookie("pw_" + row.ID)
 		if err != nil || c.Value != unlockToken(row.ID) {
-			renderPage(w, "unlock.html", map[string]any{"Page": "unlock", "ID": row.ID, "Wrong": false, "CreatedAgo": agoString(row.CreatedAt), "CreatedAtUnix": row.CreatedAt})
+			h.renderPage(w, "unlock.html", map[string]any{"Page": "unlock", "ID": row.ID, "Wrong": false, "CreatedAgo": agoString(row.CreatedAt), "CreatedAtUnix": row.CreatedAt})
 			return
 		}
 	}
@@ -242,17 +250,43 @@ func (a *apiServer) handlePasteView(w http.ResponseWriter, r *http.Request) {
 	// ever moved via /raw and the API-stored count stayed at 0 (#33).
 	// The just-created banner render does not count as a view.
 	if !justCreated {
-		a.store.IncrementViews(row.ID)
+		h.Store.IncrementViews(row.ID)
 	}
-	// #49: burn-after-N-reads budget (per-viewer, 15-minute dedupe window).
+	// #49: burn-after-N-reads budget (per-viewer dedupe window).
 	// Just-created first render does not count as a read for the creator.
 	if !justCreated {
-		rem, _ := a.store.registerRead(row, currentViewerID(r))
-		a.renderPaste(w, row, false, "", rem)
+		rem, _ := h.Store.RegisterRead(row, h.ViewerID(r), h.BurnWindowMin())
+		h.renderPaste(w, row, false, "", rem)
 		return
 	}
 	// only pass the token to the template right after creation
-	a.renderPaste(w, row, true, token, nil)
+	h.renderPaste(w, row, true, token, nil)
 }
 
-var _ = strconv.Itoa
+// HandleNewPage serves /new.
+func (h *Handlers) HandleNewPage(w http.ResponseWriter, r *http.Request) {
+	h.renderPage(w, "new.html", map[string]any{"Page": "new"})
+}
+
+// HandleHistoryPage serves /history.
+func (h *Handlers) HandleHistoryPage(w http.ResponseWriter, r *http.Request) {
+	h.renderPage(w, "history.html", map[string]any{"Page": "history"})
+}
+
+// HandleSettingsPage serves /settings.
+func (h *Handlers) HandleSettingsPage(w http.ResponseWriter, r *http.Request) {
+	h.renderPage(w, "settings.html", map[string]any{"Page": "settings"})
+}
+
+// HandleMinePage serves /mine.
+func (h *Handlers) HandleMinePage(w http.ResponseWriter, r *http.Request) {
+	h.renderPage(w, "mine.html", map[string]any{"Page": "mine"})
+}
+
+// HandleAdminPage serves /admin.
+func (h *Handlers) HandleAdminPage(w http.ResponseWriter, r *http.Request) {
+	h.renderPage(w, "admin.html", map[string]any{"Page": "admin"})
+}
+
+// Handlers builds a web.Handlers bound to this UI.
+func (u *UI) Handlers() *Handlers { return &Handlers{UI: u} }

main.go

@@ -1,833 +0,0 @@
-package main
-
-import (
-	"context"
-	"database/sql"
-	"embed"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"log"
-	"net/http"
-	"os"
-	"strconv"
-	"strings"
-	"time"
-
-	"github.com/go-chi/chi/v5"
-	"github.com/go-chi/chi/v5/middleware"
-	_ "modernc.org/sqlite"
-)
-
-//go:embed web/templates/* web/static/*
-var webFS embed.FS
-
-const (
-	softDeleteGraceDays = 7
-	customSlugReservationDays = 30
-)
-
-type Config struct {
-	Addr            string
-	DBPath          string
-	MaxTextBytes    int64
-	MaxItemBytes    int64
-}
-
-type Paste struct {
-	ID          string  `json:"id"`
-	CustomSlug  *string `json:"custom_slug,omitempty"`
-	Content     string  `json:"content"`
-	ContentType string  `json:"content_type"`
-	Language    *string `json:"language,omitempty"`
-	Title       *string `json:"title,omitempty"`
-	Password    *string `json:"password,omitempty"`
-	ExpiresIn   *string `json:"expires_in,omitempty"`
-	BurnAfterRead bool  `json:"burn_after_read,omitempty"`
-	BurnAfterReads *int `json:"burn_after_reads,omitempty"` // #49: readable N times (default 1)
-	Visibility  string  `json:"visibility"`
-	CanID       *string `json:"can_id,omitempty"`
-	CreatedAt   int64   `json:"created_at"`
-	DeletedAt   *int64  `json:"deleted_at,omitempty"`
-	ExpiresAt   *int64  `json:"expires_at,omitempty"`
-	ViewerID    string  `json:"-"` // set from vwr cookie server-side (#37)
-	readsLimit  *int64  // #49: resolved read budget, not serialized
-	ViewCount   int     `json:"view_count"`
-	DeletionToken string `json:"-"`
-}
-
-type PasteRow struct {
-	ID            string
-	CustomSlug    sql.NullString
-	Content       string
-	ContentType   string
-	Language      sql.NullString
-	Title         sql.NullString
-	PasswordHash  sql.NullString
-	ExpiresAt     sql.NullInt64
-	BurnAfterRead bool
-	ReadsLimit    sql.NullInt64
-	ReadsUsed     int
-	Visibility    string
-	CanID         sql.NullString
-	CreatedAt     int64
-	DeletedAt     sql.NullInt64
-	ViewCount     int
-	Size          int
-	DeletionToken sql.NullString
-	ViewerID      sql.NullString
-}
-
-type CanRow struct {
-	ID           string
-	Title        sql.NullString
-	Visibility   string
-	PasswordHash sql.NullString
-	CreatedAt    int64
-	DeletedAt    sql.NullInt64
-	ExpiresAt    sql.NullInt64
-}
-
-type Store struct {
-	db *sql.DB
-}
-
-func OpenStore(path string) (*Store, error) {
-	db, err := sql.Open("sqlite", path+"?_pragma=journal_mode(WAL)&_pragma=busy_timeout(5000)")
-	if err != nil {
-		return nil, err
-	}
-	s := &Store{db: db}
-	if err := s.migrate(); err != nil {
-		return nil, err
-	}
-	return s, nil
-}
-
-func (s *Store) migrate() error {
-	_, err := s.db.Exec(`
-	CREATE TABLE IF NOT EXISTS pastes (
-		id            TEXT PRIMARY KEY,
-		custom_slug   TEXT UNIQUE,
-		content       TEXT NOT NULL,
-		content_type  TEXT NOT NULL DEFAULT 'text/plain',
-		language      TEXT,
-		title         TEXT,
-		password_hash TEXT,
-		expires_at    INTEGER,
-		burn_after_read INTEGER DEFAULT 0,
-		visibility    TEXT NOT NULL DEFAULT 'public',
-		can_id        TEXT,
-		created_at    INTEGER NOT NULL,
-		deleted_at    INTEGER,
-		view_count    INTEGER NOT NULL DEFAULT 0,
-	deletion_token TEXT
-	);
-	CREATE INDEX IF NOT EXISTS idx_pastes_visibility_created ON pastes(visibility, created_at DESC);
-	CREATE INDEX IF NOT EXISTS idx_pastes_expires ON pastes(expires_at) WHERE expires_at IS NOT NULL;
-	CREATE INDEX IF NOT EXISTS idx_pastes_deleted ON pastes(deleted_at) WHERE deleted_at IS NOT NULL;
-	CREATE TABLE IF NOT EXISTS paste_cans (
-		id            TEXT PRIMARY KEY,
-		title         TEXT,
-		description   TEXT,
-		visibility    TEXT NOT NULL DEFAULT 'public',
-		password_hash TEXT,
-		created_at    INTEGER NOT NULL,
-		deleted_at    INTEGER,
-		expires_at    INTEGER
-	);
-	`)
-	s.db.Exec(`ALTER TABLE pastes ADD COLUMN deletion_token TEXT`) // ignore if exists
-	s.db.Exec(`ALTER TABLE pastes ADD COLUMN viewer_id TEXT`)     // ignore if exists (#37)
-	s.db.Exec(`ALTER TABLE pastes ADD COLUMN reads_limit INTEGER`)          // ignore if exists (#49)
-	s.db.Exec(`ALTER TABLE pastes ADD COLUMN reads_used INTEGER DEFAULT 0`) // ignore if exists (#49)
-	s.db.Exec(`CREATE TABLE IF NOT EXISTS paste_views (
-		paste_id    TEXT NOT NULL,
-		viewer_id   TEXT NOT NULL,
-		last_viewed INTEGER NOT NULL,
-		PRIMARY KEY (paste_id, viewer_id)
-	)`) // #49: per-viewer read dedupe window
-	return err
-}
-
-var slugAlphabet = "23456789abcdefghjkmnpqrstuvwxyz"
-var httpClient = &http.Client{}
-
-func genSlug(n int) string {
-	b := make([]byte, n)
-	_, _ = cryptorandRead(b)
-	for i := range b {
-		b[i] = slugAlphabet[int(b[i])%len(slugAlphabet)]
-	}
-	return string(b)
-}
-
-// cryptorandRead wraps crypto/rand
-func cryptorandRead(b []byte) (int, error) {
-	return cryptoRead(b)
-}
-
-// validExpiry reports whether an expires_in duration is in the accepted
-// window. The UI restricts presets to 1 minute - 1 year (#48); the API must
-// enforce the same bounds, otherwise negative/zero/absurd durations create
-// pastes that are born expired (or effectively permanent).
-const (
-	minExpiry = time.Minute
-	maxExpiry = 366 * 24 * time.Hour // 1 year (+ leap day headroom)
-)
-
-func validExpiry(d time.Duration) bool {
-	return d >= minExpiry && d <= maxExpiry
-}
-
-func (s *Store) CreatePaste(p *Paste) (*Paste, error) {
-	id := genSlug(6)
-	now := time.Now().Unix()
-
-	var expiresAt *int64
-	if p.ExpiresIn != nil && *p.ExpiresIn != "" {
-		d, err := time.ParseDuration(*p.ExpiresIn)
-		if err != nil {
-			return nil, fmt.Errorf("invalid expires_in: %w", err)
-		}
-		if !validExpiry(d) {
-			return nil, fmt.Errorf("expires_in must be between 1 minute and 1 year")
-		}
-		t := now + int64(d.Seconds())
-		expiresAt = &t
-	}
-
-	var pwHash *string
-	if p.Password != nil && *p.Password != "" {
-		h, err := hashPassword(*p.Password)
-		if err != nil {
-			return nil, err
-		}
-		pwHash = &h
-	}
-
-	if p.CustomSlug != nil && *p.CustomSlug != "" {
-		slug := *p.CustomSlug
-		if err := ValidateCustomSlug(slug); err != nil {
-			return nil, err
-		}
-		taken, err := s.SlugTaken(slug)
-		if err != nil {
-			return nil, err
-		}
-		if taken {
-			return nil, errSlugTaken
-		}
-	}
-
-	// #49: burn-after-read pastes carry a read budget (default 1 read)
-	if p.BurnAfterRead {
-		limit := int64(1)
-		if p.BurnAfterReads != nil && *p.BurnAfterReads > 0 {
-			limit = int64(*p.BurnAfterReads)
-		}
-		p.readsLimit = &limit
-	}
-
-	visibility := p.Visibility
-	if visibility == "" {
-		visibility = "public"
-	}
-	if visibility != "public" && visibility != "unlisted" {
-		return nil, errors.New("visibility must be public or unlisted")
-	}
-
-	contentType := p.ContentType
-	if contentType == "" {
-		contentType = "text/plain"
-	}
-
-	var slugVal *string
-	if p.CustomSlug != nil && *p.CustomSlug != "" {
-		slugVal = p.CustomSlug
-	}
-	p.DeletionToken = genDeletionToken()
-	_, err := s.db.Exec(`INSERT INTO pastes
-		(id, custom_slug, content, content_type, language, title, password_hash, expires_at, burn_after_read, visibility, created_at, deletion_token, viewer_id, reads_limit)
-		VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?)`,
-		id, slugVal, p.Content, contentType, p.Language, p.Title, pwHash, expiresAt, boolToInt(p.BurnAfterRead), visibility, now, p.DeletionToken, p.ViewerID, p.readsLimit)
-	if err != nil {
-		return nil, err
-	}
-	p.ID = id
-	p.CreatedAt = now
-	p.ExpiresAt = expiresAt
-	p.Visibility = visibility
-	return p, nil
-}
-
-func (s *Store) GetPaste(idOrSlug string) (*PasteRow, error) {
-	row := s.db.QueryRow(`SELECT id, custom_slug, content, content_type, language, title, password_hash, expires_at, burn_after_read, visibility, can_id, created_at, deleted_at, view_count, deletion_token, viewer_id, reads_limit, COALESCE(reads_used, 0)
-		FROM pastes WHERE (id = ? OR custom_slug = ?) AND deleted_at IS NULL`, idOrSlug, idOrSlug)
-	var r PasteRow
-	err := row.Scan(&r.ID, &r.CustomSlug, &r.Content, &r.ContentType, &r.Language, &r.Title, &r.PasswordHash, &r.ExpiresAt, &r.BurnAfterRead, &r.Visibility, &r.CanID, &r.CreatedAt, &r.DeletedAt, &r.ViewCount, &r.DeletionToken, &r.ViewerID, &r.ReadsLimit, &r.ReadsUsed)
-	if err == sql.ErrNoRows {
-		return nil, nil
-	}
-	return &r, err
-}
-
-func (s *Store) ListPublic(limit, offset int) ([]PasteRow, int, error) {
-	rows, err := s.db.Query(`SELECT id, custom_slug, content_type, language, title, visibility, created_at, view_count, LENGTH(content) FROM pastes
-		WHERE visibility='public' AND deleted_at IS NULL AND can_id IS NULL AND (expires_at IS NULL OR expires_at > ?)
-		ORDER BY created_at DESC LIMIT ? OFFSET ?`, time.Now().Unix(), limit, offset)
-	if err != nil {
-		return nil, 0, err
-	}
-	defer rows.Close()
-	var out []PasteRow
-	for rows.Next() {
-		var r PasteRow
-		var cs, lang, title sql.NullString
-		if err := rows.Scan(&r.ID, &cs, &r.ContentType, &lang, &title, &r.Visibility, &r.CreatedAt, &r.ViewCount, &r.Size); err != nil {
-			return nil, 0, err
-		}
-		r.CustomSlug = cs
-		r.Language = lang
-		r.Title = title
-		out = append(out, r)
-	}
-	var total int
-	s.db.QueryRow(`SELECT COUNT(*) FROM pastes WHERE visibility='public' AND deleted_at IS NULL AND can_id IS NULL AND (expires_at IS NULL OR expires_at > ?)`, time.Now().Unix()).Scan(&total)
-	return out, total, nil
-}
-
-// ListMine lists pastes created from the given viewer id (browser cookie), newest first.
-func (s *Store) ListMine(viewerID string, limit, offset int) ([]PasteRow, int, error) {
-	rows, err := s.db.Query(`SELECT id, custom_slug, language, title, visibility, created_at, view_count, LENGTH(content)
-		FROM pastes
-		WHERE viewer_id = ? AND deleted_at IS NULL AND can_id IS NULL AND (expires_at IS NULL OR expires_at > ?)
-		ORDER BY created_at DESC LIMIT ? OFFSET ?`, viewerID, time.Now().Unix(), limit, offset)
-	if err != nil {
-		return nil, 0, err
-	}
-	defer rows.Close()
-	var out []PasteRow
-	for rows.Next() {
-		var r PasteRow
-		var cs, lang, title sql.NullString
-		if err := rows.Scan(&r.ID, &cs, &lang, &title, &r.Visibility, &r.CreatedAt, &r.ViewCount, &r.Size); err != nil {
-			return nil, 0, err
-		}
-		r.CustomSlug, r.Language, r.Title = cs, lang, title
-		out = append(out, r)
-	}
-	var total int
-	s.db.QueryRow(`SELECT COUNT(*) FROM pastes
-		WHERE viewer_id = ? AND deleted_at IS NULL AND can_id IS NULL AND (expires_at IS NULL OR expires_at > ?)`,
-		viewerID, time.Now().Unix()).Scan(&total)
-	return out, total, nil
-}
-
-// MineOwner returns the stored viewer_id for a paste, or "" if none.
-func (s *Store) MineOwner(id string) (string, error) {
-	var vid sql.NullString
-	err := s.db.QueryRow(`SELECT viewer_id FROM pastes WHERE id = ? AND deleted_at IS NULL`, id).Scan(&vid)
-	if err == sql.ErrNoRows {
-		return "", nil
-	}
-	if err != nil {
-		return "", err
-	}
-	if !vid.Valid {
-		return "", nil
-	}
-	return vid.String, nil
-}
-
-func (s *Store) SoftDelete(id string) error {
-	_, err := s.db.Exec(`UPDATE pastes SET deleted_at=? WHERE id=? AND deleted_at IS NULL`, time.Now().Unix(), id)
-	return err
-}
-
-func (s *Store) IncrementViews(id string) {
-	s.db.Exec(`UPDATE pastes SET view_count = view_count + 1 WHERE id = ?`, id)
-}
-
-// SweepExpired soft-deletes expired pastes and hard-deletes soft-deleted pastes past grace.
-func (s *Store) SweepExpired() {
-	now := time.Now().Unix()
-	s.db.Exec(`UPDATE pastes SET deleted_at=? WHERE expires_at IS NOT NULL AND expires_at < ? AND deleted_at IS NULL`, now, now)
-	grace := now - softDeleteGraceDays*86400
-	s.db.Exec(`DELETE FROM pastes WHERE deleted_at IS NOT NULL AND deleted_at < ?`, grace)
-}
-
-// ReleaseCustomSlugs frees custom URLs so they can be reused:
-//   - pastes whose expires_at has passed (expired or soft-deleted/expired),
-//   - pastes created more than 30 days ago (custom URLs are a reservation, not permanent).
-//
-// It returns the number of pastes whose custom_slug was released.
-func (s *Store) ReleaseCustomSlugs() (int64, error) {
-	now := time.Now().Unix()
-	res, err := s.db.Exec(`UPDATE pastes SET custom_slug = NULL
-		WHERE custom_slug IS NOT NULL
-		  AND (expires_at IS NOT NULL AND expires_at > 0 AND expires_at < ?
-		   OR created_at < ?)`,
-		now, now-customSlugReservationDays*86400)
-	if err != nil {
-		return 0, err
-	}
-	n, _ := res.RowsAffected()
-	if n > 0 {
-		log.Printf("released %d custom slug(s)", n)
-	}
-	return n, nil
-}
-
-func (s *Store) StartSweeper(every time.Duration) {
-	go func() {
-		t := time.NewTicker(every)
-		for range t.C {
-			s.SweepExpired()
-			s.ReleaseCustomSlugs()
-		}
-	}()
-}
-
-func hashPassword(pw string) (string, error) {
-	// argon2id
-	return argon2idHash(pw)
-}
-
-func boolToInt(b bool) int {
-	if b {
-		return 1
-	}
-	return 0
-}
-
-func nullStrPtr(ns sql.NullString) *string {
-	if ns.Valid {
-		return &ns.String
-	}
-	return nil
-}
-
-func writeJSON(w http.ResponseWriter, status int, v any) {
-	w.Header().Set("Content-Type", "application/json")
-	w.WriteHeader(status)
-	json.NewEncoder(w).Encode(v)
-}
-
-func writeErr(w http.ResponseWriter, status int, msg string) {
-	writeJSON(w, status, map[string]string{"error": msg})
-}
-
-type apiServer struct {
-	store    *Store
-	cfg      Config
-	settings *settingsStore
-	adminKey string
-}
-
-func (a *apiServer) routes() http.Handler {
-	r := chi.NewRouter()
-	r.Use(middleware.Recoverer)
-	r.Use(middleware.Timeout(30 * time.Second))
-	r.Use(viewerCookieMiddleware)
-
-	// admin (#40): HTML page is open (key entry via form); API is key-guarded
-	r.Get("/admin", a.handleAdminPage)
-	r.Get("/admin/api/settings", a.adminAuth(a.handleAdminGetSettings, a.adminKey))
-	r.Post("/admin/api/settings", a.adminAuth(a.handleAdminPostSettings, a.adminKey))
-
-	// API
-	r.Route("/api", func(r chi.Router) {
-		r.Post("/pastes", a.handleCreatePaste)
-		r.Get("/pastes/{id}", a.handleGetPaste)
-		r.Delete("/pastes/{id}", a.handleDeletePaste)
-		r.Get("/mine", a.handleListMine)
-		r.Delete("/pastes/{id}/redeem", a.handleRedeemDeletion)
-		r.Get("/public", a.handleListPublic)
-		r.Post("/guess-language", a.handleGuessLang)
-		r.Post("/pastes/can", a.handleCreateCan)
-		r.Get("/cans/{id}", a.handleGetCan)
-		r.Get("/cans/{id}/items/{item}", a.handleCanItem)
-	})
-
-	// can page
-	r.Get("/can/{id}", a.handleCanPage)
-
-	// raw
-	r.Get("/raw/{id}", a.handleRaw)
-
-	// web pages
-	r.Get("/", http.RedirectHandler("/history", http.StatusFound).ServeHTTP)
-	r.Get("/new", a.handleNewPage)
-	r.Get("/history", a.handleHistoryPage)
-	r.Get("/settings", a.handleSettingsPage)
-	r.Get("/mine", a.handleMinePage)
-	r.Handle("/static/*", staticHandler())
-	r.Get("/unlock/{id}", a.handlePasteView)
-	r.Post("/unlock/{id}", a.handlePasteView)
-	r.Get("/{id}", a.handlePasteView)
-	r.Post("/{id}", a.handlePasteView)
-
-	r.NotFound(func(w http.ResponseWriter, r *http.Request) {
-		writeErr(w, 404, "not found")
-	})
-	return r
-}
-
-// viewerCookieMiddleware ensures every request carries an anonymous browser id
-// cookie ("vwr"); sets one on the response if absent. Used by /mine (#37, #49).
-func viewerCookieMiddleware(next http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		if c, err := r.Cookie("vwr"); err != nil || c.Value == "" {
-			id := genSlug(16)
-			http.SetCookie(w, &http.Cookie{
-				Name: "vwr", Value: id, Path: "/",
-				MaxAge: 31536000, HttpOnly: true, SameSite: http.SameSiteLaxMode,
-			})
-			r.AddCookie(&http.Cookie{Name: "vwr", Value: id})
-			// remember that this cookie was minted here, not sent by the client
-			r = r.WithContext(context.WithValue(r.Context(), vwrMintedKey, true))
-		}
-		next.ServeHTTP(w, r)
-	})
-}
-
-type vwrMintedKeyType struct{}
-
-var vwrMintedKey vwrMintedKeyType
-
-func currentViewerID(r *http.Request) string {
-	if c, err := r.Cookie("vwr"); err == nil {
-		return c.Value
-	}
-	return ""
-}
-
-// viewerSentCookie reports whether the client itself sent a vwr cookie
-// (as opposed to the middleware minting one for this request).
-func viewerSentCookie(r *http.Request) bool {
-	if _, err := r.Cookie("vwr"); err != nil {
-		return false
-	}
-	_, minted := r.Context().Value(vwrMintedKey).(bool)
-	return !minted
-}
-
-func (a *apiServer) handleCreatePaste(w http.ResponseWriter, r *http.Request) {
-	setRateLimitHeaders(w, 1, 5)
-	if !rateLimitCreate(r) {
-		writeRateLimited(w, 1)
-		return
-	}
-	var p Paste
-	if err := json.NewDecoder(r.Body).Decode(&p); err != nil {
-		writeErr(w, 400, "invalid json body")
-		return
-	}
-	if strings.TrimSpace(p.Content) == "" {
-		writeErr(w, 400, "content is required")
-		return
-	}
-	if int64(len(p.Content)) > a.settings.get().MaxContentBytes { // #40: admin-tunable
-		writeErr(w, 413, fmt.Sprintf("content exceeds max %d bytes", a.settings.get().MaxContentBytes))
-		return
-	}
-	// #40: admin-configurable default expiry
-	if (p.ExpiresIn == nil || *p.ExpiresIn == "") && a.settings.get().DefaultExpiry != "" {
-		def := a.settings.get().DefaultExpiry
-		p.ExpiresIn = &def
-	}
-	p.ViewerID = currentViewerID(r)
-	created, err := a.store.CreatePaste(&p)
-	if err != nil {
-		writeErr(w, 400, err.Error())
-		return
-	}
-	writeJSON(w, 201, map[string]any{
-		"id":        created.ID,
-		"deletion_token": created.DeletionToken,
-		"url":       "/" + created.ID,
-		"raw_url":   "/raw/" + created.ID,
-		"api_url":   "/api/pastes/" + created.ID,
-		"expires_at": created.ExpiresAt,
-		"created_at": created.CreatedAt,
-		"rate_limit": map[string]int{"create_per_sec": 1, "burst": 5},
-	})
-}
-
-func (a *apiServer) handleGetPaste(w http.ResponseWriter, r *http.Request) {
-	id := chi.URLParam(r, "id")
-	row, err := a.store.GetPaste(id)
-	if err != nil {
-		writeErr(w, 500, "db error")
-		return
-	}
-	if row == nil {
-		writeErr(w, 404, "paste not found")
-		return
-	}
-	if row.ExpiresAt.Valid && row.ExpiresAt.Int64 < time.Now().Unix() {
-		writeErr(w, 404, "paste expired")
-		return
-	}
-	if row.burned() { // #49: read budget exhausted
-		writeErr(w, 404, "paste not found")
-		return
-	}
-	if row.PasswordHash.Valid {
-		// require password via header or query
-		pw := r.Header.Get("X-Paste-Password")
-		if pw == "" {
-			pw = r.URL.Query().Get("password")
-		}
-		if pw == "" || !checkPassword(row.PasswordHash.String, pw) {
-			writeErr(w, 401, "password required")
-			return
-		}
-	}
-	nullPtr := func(ns sql.NullString) *string {
-		if ns.Valid {
-			return &ns.String
-		}
-		return nil
-	}
-	rem, _ := a.store.registerRead(row, currentViewerID(r)) // #49 (also covers legacy burn)
-	writeJSON(w, 200, map[string]any{
-		"id": row.ID, "content": row.Content, "content_type": row.ContentType,
-		"language": nullPtr(row.Language), "title": nullPtr(row.Title), "created_at": row.CreatedAt,
-		"view_count": row.ViewCount, "visibility": row.Visibility,
-		"reads_remaining": rem,
-	})
-}
-
-func (a *apiServer) handleDeletePaste(w http.ResponseWriter, r *http.Request) {
-	id := chi.URLParam(r, "id")
-	row, err := a.store.GetPaste(id)
-	if err != nil || row == nil {
-		writeErr(w, 404, "paste not found")
-		return
-	}
-	// viewer-cookie delete enforcement (#37): only the browser that created
-	// the paste (matching vwr) may delete it via this endpoint. Requests with
-	// no client-sent vwr cookie (plain API clients) are unaffected.
-	vid := currentViewerID(r)
-	if vid != "" && viewerSentCookie(r) && row.ViewerID.Valid && row.ViewerID.String != "" && row.ViewerID.String != vid {
-		writeErr(w, 403, "not your paste")
-		return
-	}
-	if err := a.store.SoftDelete(row.ID); err != nil {
-		writeErr(w, 500, "db error")
-		return
-	}
-	writeJSON(w, 200, map[string]string{"status": "soft-deleted"})
-}
-
-// handleListMine serves /api/mine: pastes created from this browser (#37).
-func (a *apiServer) handleListMine(w http.ResponseWriter, r *http.Request) {
-	vid := currentViewerID(r)
-	if vid == "" {
-		writeJSON(w, 200, map[string]any{"total": 0, "items": []any{}})
-		return
-	}
-	limit, _ := strconv.Atoi(r.URL.Query().Get("limit"))
-	if limit <= 0 || limit > 100 {
-		limit = 50
-	}
-	offset, _ := strconv.Atoi(r.URL.Query().Get("offset"))
-	rows, total, err := a.store.ListMine(vid, limit, offset)
-	if err != nil {
-		writeErr(w, 500, "db error")
-		return
-	}
-	items := make([]map[string]any, 0, len(rows))
-	for _, row := range rows {
-		lang, title := nullStrPtr(row.Language), nullStrPtr(row.Title)
-		items = append(items, map[string]any{
-			"id": row.ID, "title": title, "language": lang,
-			"created_at": row.CreatedAt, "view_count": row.ViewCount, "size": row.Size,
-			"custom_slug": nullStrPtr(row.CustomSlug), "visibility": row.Visibility,
-		})
-	}
-	writeJSON(w, 200, map[string]any{"total": total, "limit": limit, "offset": offset, "items": items})
-}
-
-func (a *apiServer) handleListPublic(w http.ResponseWriter, r *http.Request) {
-	limit, _ := strconv.Atoi(r.URL.Query().Get("limit"))
-	if limit <= 0 || limit > 100 {
-		limit = 25
-	}
-	offset, _ := strconv.Atoi(r.URL.Query().Get("offset"))
-	rows, total, err := a.store.ListPublic(limit, offset)
-	if err != nil {
-		writeErr(w, 500, "db error")
-		return
-	}
-	items := make([]map[string]any, 0, len(rows))
-	for _, row := range rows {
-		lang, title := nullStrPtr(row.Language), nullStrPtr(row.Title)
-		items = append(items, map[string]any{
-			"id": row.ID, "title": title, "language": lang,
-			"created_at": row.CreatedAt, "view_count": row.ViewCount, "size": row.Size,
-			"custom_slug": nullStrPtr(row.CustomSlug),
-		})
-	}
-	writeJSON(w, 200, map[string]any{"total": total, "limit": limit, "offset": offset, "items": items})
-}
-
-func (a *apiServer) handleRaw(w http.ResponseWriter, r *http.Request) {
-	id := chi.URLParam(r, "id")
-	row, err := a.store.GetPaste(id)
-	if err != nil || row == nil {
-		http.Error(w, "not found", 404)
-		return
-	}
-	if row.ExpiresAt.Valid && row.ExpiresAt.Int64 < time.Now().Unix() {
-		http.Error(w, "paste expired", 404)
-		return
-	}
-	if row.PasswordHash.Valid {
-		http.Error(w, "password required", 401)
-		return
-	}
-	if row.burned() { // #49: read budget exhausted
-		http.Error(w, "not found", 404)
-		return
-	}
-	// #49 decision: raw reads count against the read budget too, with the
-	// same per-viewer 15-minute dedupe window as page views.
-	a.store.registerRead(row, currentViewerID(r))
-	// #34: content_type is attacker-controlled via the create API. Serving it
-	// verbatim let a paste be stored with text/html (or image/svg+xml) and
-	// render as active content on this origin when fetched from /raw —
-	// stored XSS. Only pass through a fixed safe set; anything else is
-	// served as plain text with nosniff.
-	ct := row.ContentType
-	if !safeRawContentType(ct) {
-		ct = "text/plain; charset=utf-8"
-	}
-	w.Header().Set("Content-Type", ct)
-	w.Header().Set("X-Content-Type-Options", "nosniff")
-	a.store.IncrementViews(row.ID)
-	w.Write([]byte(row.Content))
-}
-
-// safeRawContentType reports whether ct is in the fixed set of types that are
-// safe to serve verbatim on /raw (no active-content execution contexts).
-func safeRawContentType(ct string) bool {
-	base := ct
-	if i := strings.IndexByte(ct, ';'); i >= 0 {
-		base = ct[:i]
-	}
-	base = strings.ToLower(strings.TrimSpace(base))
-	switch base {
-	case "text/plain", "text/markdown", "text/x-markdown",
-		"application/json", "application/pdf",
-		"image/png", "image/jpeg", "image/gif", "image/webp",
-		"application/octet-stream":
-		return true
-	}
-	return false
-}
-
-func (a *apiServer) handleCanPage(w http.ResponseWriter, r *http.Request) {
-	id := chi.URLParam(r, "id")
-	can, err := a.store.GetCan(id)
-	if err != nil || can == nil {
-		http.NotFound(w, r)
-		return
-	}
-	items, _ := a.store.ListCanItems(can.ID)
-	w.Header().Set("Content-Type", "text/html; charset=utf-8")
-	fmt.Fprintf(w, "<!doctype html><html><head><title>can/%s — palette</title></head><body><h1>can/%s</h1><ul>", can.ID, can.ID)
-	for _, it := range items {
-		fmt.Fprintf(w, `<li><a href="/api/cans/%s/items/%s">%s</a> (%s)</li>`, can.ID, it.ID, templateEsc(nullStrOr(it.Title, it.ID)), it.ContentType)
-	}
-	fmt.Fprintf(w, "</ul></body></html>")
-}
-
-func nullStrOr(ns sql.NullString, def string) string {
-	if ns.Valid {
-		return ns.String
-	}
-	return def
-}
-
-func (a *apiServer) handleHome(w http.ResponseWriter, r *http.Request) {
-	w.Header().Set("Content-Type", "text/plain")
-	w.Write([]byte("palette pastebin api\nPOST /api/pastes  {\"content\": \"...\", \"language\": \"go\", \"expires_in\": \"168h\", \"password\": \"...\", \"visibility\": \"public\"}\nGET  /api/pastes/{id}\nGET  /api/public?limit=25&offset=0\nGET  /raw/{id}\n"))
-}
-
-func (a *apiServer) handlePastePage(w http.ResponseWriter, r *http.Request) {
-	id := chi.URLParam(r, "id")
-	// if it looks like an asset request, 404
-	if strings.Contains(id, ".") {
-		http.NotFound(w, r)
-		return
-	}
-	row, err := a.store.GetPaste(id)
-	if err != nil || row == nil {
-		http.NotFound(w, r)
-		return
-	}
-	a.store.IncrementViews(row.ID)
-	// render basic view; full templates come later with frontend work
-	w.Header().Set("Content-Type", "text/html; charset=utf-8")
-	fmt.Fprintf(w, "<!doctype html><html><head><title>%s — palette</title></head><body><pre>%s</pre></body></html>",
-		row.ID, templateEsc(row.Content))
-}
-
-func templateEsc(s string) string {
-	r := strings.NewReplacer("&", "&amp;", "<", "&lt;", ">", "&gt;")
-	return r.Replace(s)
-}
-
-func main() {
-	// #40: --reset-admin-key regenerates the admin key and exits.
-	if len(os.Args) > 1 && (os.Args[1] == "--reset-admin-key") {
-		handleResetAdminKey(envOr("PALETTE_DB", "palette.db"))
-		return
-	}
-	cfg := Config{
-		Addr:         envOr("PALETTE_ADDR", ":8080"),
-		DBPath:       envOr("PALETTE_DB", "palette.db"),
-		MaxTextBytes: int64(envIntOr("PALETTE_MAX_TEXT", 5*1024*1024)),
-		MaxItemBytes: int64(envIntOr("PALETTE_MAX_ITEM", 25*1024*1024)),
-	}
-	store, err := OpenStore(cfg.DBPath)
-	if err != nil {
-		log.Fatal(err)
-	}
-	store.StartSweeper(time.Minute)
-
-	adminKey, err := resolveAdminKey(cfg.DBPath)
-	if err != nil {
-		log.Fatal(err)
-	}
-	ss := loadSettingsStore(cfg.DBPath, cfg)
-
-	ui, err := NewWebUI()
-	if err != nil {
-		log.Fatal(err)
-	}
-	webUIInstance = ui
-	srv := &apiServer{store: store, cfg: cfg, settings: ss, adminKey: adminKey}
-	globalSettingsFn = func() Settings { return ss.get() }
-	log.Printf("palette listening on %s", cfg.Addr)
-	log.Fatal(http.ListenAndServe(cfg.Addr, srv.routes()))
-}
-
-func envOr(k, d string) string {
-	if v := os.Getenv(k); v != "" {
-		return v
-	}
-	return d
-}
-
-func envIntOr(k string, d int) int {
-	if v := os.Getenv(k); v != "" {
-		if n, err := strconv.Atoi(v); err == nil {
-			return n
-		}
-	}
-	return d
-}