Remove cans feature; harden pw_/tok_ cookie flags (pre-release fixes) (#307)

internal/store/customslug.go

@@ -10,7 +10,7 @@ var slugRE = regexp.MustCompile(`^[a-zA-Z0-9][a-zA-Z0-9-_]{0,63}$`)
 
 // reserved words that would collide with routes
 var reservedSlugs = map[string]bool{
-	"api": true, "raw": true, "can": true, "cans": true, "public": true,
+	"api": true, "raw": true, "public": true,
 	"history": true, "static": true, "assets": true, "favicon.ico": true,
 	"new": true, "login": true, "logout": true, "admin": true, "settings": true,
 	"mine": true, "saved": true, "unlock": true, "guess": true, "f": true,
@@ -36,12 +36,5 @@ func (s *Store) SlugTaken(slug string) (bool, error) {
 	if err != nil {
 		return false, err
 	}
-	if n > 0 {
-		return true, nil
-	}
-	err = s.db.QueryRow(`SELECT COUNT(*) FROM paste_cans WHERE id = ?`, slug).Scan(&n)
-	if err != nil {
-		return false, err
-	}
 	return n > 0, nil
 }