embed bootstrap css

internal/writing/html/writer.go

@@ -2,7 +2,9 @@
 // standalone HTML document: the report table fragment (built from the
 // shared table definition in internal/writing/internal/tabledef, so it can
 // never drift from the terminal layout) embedded in a Bootstrap-styled page
-// with a translated title and generation timestamp.
+// with a translated title and generation timestamp. The official Bootstrap
+// 5.3.3 stylesheet is inlined via go:embed, so the document renders fully
+// offline.
 package html
 
 import (
@@ -16,11 +18,18 @@ import (
 	"github.com/nmoniz/any2anexoj/internal/writing/internal/tabledef"
 )
 
-// bootstrapCSSURL is the jsDelivr CDN URL for Bootstrap 5.3.3.
-const bootstrapCSSURL = "https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"
-
-// bootstrapIntegrity is the official SRI hash for Bootstrap 5.3.3 css.
-const bootstrapIntegrity = "sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH"
+// bootstrapMinCSS is the official Bootstrap 5.3.3 minified CSS distribution
+// file, embedded so every rendered document renders fully offline. After any
+// version bump, re-verify provenance with:
+//
+//	openssl dgst -sha384 -binary bootstrap.min.css | base64
+//
+// It must print the official SRI hash published at
+// https://getbootstrap.com/docs/5.3/getting-started/download/
+// (sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH).
+//
+//go:embed bootstrap.min.css
+var bootstrapMinCSS string
 
 // Writer writes a complete HTML document for an AggregatorWriter.
 type Writer struct {
@@ -59,15 +68,13 @@ func (hw *Writer) Render(aw *internal.AggregatorWriter) error {
 	data := struct {
 		Lang          string
 		Title         string
-		CSSURL        string
-		Integrity     string
+		CSS           template.CSS
 		TableFragment template.HTML
 		GeneratedAt   string
 	}{
 		Lang:          hw.lang,
 		Title:         title,
-		CSSURL:        bootstrapCSSURL,
-		Integrity:     bootstrapIntegrity,
+		CSS:           template.CSS(bootstrapMinCSS),
 		TableFragment: template.HTML(fragment),
 		GeneratedAt:   time.Now().UTC().Format(time.RFC3339),
 	}