add function convert html

converter/converter.go

@@ -126,6 +126,59 @@ func (c *Converter) Convert(files ...models.File) error {
 	return nil
 }
 
+// Convert converts all given input files
+func (c *Converter) ConvertHtml(html []byte, outputPath string) error {
+
+	if len(html) == 0 {
+		return fmt.Errorf("no .html input provided")
+	} else if outputPath == "" || filepath.Ext(outputPath) != ".pdf" {
+		return fmt.Errorf("no .pdf output file path provided: %s", outputPath)
+	}
+
+	taskCtx, taskCancel := chromedp.NewContext(c.browserCtx)
+	timeoutCtx, timeoutCancel := context.WithTimeout(taskCtx, 60*time.Second)
+
+	var pdfData []byte
+	err := chromedp.Run(timeoutCtx,
+		// Start with a blank page
+		chromedp.Navigate("about:blank"),
+		// Inject HTML directly
+		chromedp.ActionFunc(func(ctx context.Context) error {
+			frameTree, err := page.GetFrameTree().Do(ctx)
+			if err != nil {
+				return err
+			}
+
+			return page.SetDocumentContent(frameTree.Frame.ID, string(html)).Do(ctx)
+		}),
+		chromedp.WaitReady("body", chromedp.ByQuery),
+		chromedp.ActionFunc(func(ctx context.Context) error {
+			buf, _, err := page.PrintToPDF().
+				WithPrintBackground(true).
+				WithPaperWidth(8.27).
+				WithPaperHeight(11.69).
+				Do(ctx)
+			if err != nil {
+				return err
+			}
+			pdfData = buf
+			return nil
+		}),
+	)
+
+	timeoutCancel()
+	taskCancel()
+	if err != nil {
+		return err
+	}
+
+	// Save PDF to file
+	if err := os.WriteFile(outputPath, pdfData, 0644); err != nil {
+		return err
+	}
+	return nil
+}
+
 func (c *Converter) Close() {
 	// Close browser first, then allocator
 	if c.browserCancel != nil {