fixed paths; protect against out-of-bounds

sitemap.go

@@ -69,7 +69,7 @@ func (m *SiteMap) SiteMapIndex() ([]byte, error) {
 
 	for i := 0; i < nSiteMaps; i++ {
 		index.SiteMaps = append(index.SiteMaps, &sitemapXML{
-			Loc: fmt.Sprintf("https://%s/sitemap%d.xml", m.BaseURL, i),
+			Loc: fmt.Sprintf("https://%s/sitemap/%d", m.BaseURL, i),
 		})
 	}
 
@@ -82,6 +82,10 @@ func (m *SiteMap) SiteMapIndex() ([]byte, error) {
 }
 
 func (m *SiteMap) SiteMap(id int) ([]byte, error) {
+	if 50000*(id) >= len(m.urls) {
+		return nil, nil
+	}
+
 	siteMap := &urlSetXML{}
 
 	var urls []*urlXML