pdf.go

func CreatePDFFromHTML(inputHTML []byte) ([]byte, error) {
	dirName, err := ioutil.TempDir("", "pdf-generator")
	if err != nil {
		return nil, err
	}

	// remove this and log the dirName if you need to debug the HTML
	defer os.RemoveAll(dirName)
	// log.Println(dirName)

	tmpFile, err := os.Create(dirName + "/html-to-print.html")
	if err != nil {
		return nil, err
	}

	_, err = tmpFile.Write(inputHTML)
	if err != nil {
		return nil, err
	}

	err = tmpFile.Close()
	if err != nil {
		return nil, err
	}

	opts := []chromedp.ExecAllocatorOption{
		chromedp.NoFirstRun,
		chromedp.NoDefaultBrowserCheck,
		chromedp.Headless,
		chromedp.DisableGPU,
		chromedp.UserDataDir(dirName),
	}

	allocCtx, cancel := chromedp.NewExecAllocator(context.Background(), opts...)
	defer cancel()

	// also set up a custom logger
	ctx, cancel := chromedp.NewContext(allocCtx, chromedp.WithLogf(log.Printf))
	defer cancel()

	// run task list
	var output []byte
	err = chromedp.Run(ctx, renderPDF("file://"+tmpFile.Name(), `#main`, &output))
	if err != nil {
		return nil, err
	}

	return output, nil
}

renderPDF function is missing.

Oh!

func renderPDF(urlstr, sel string, res *[]byte) chromedp.Tasks {
	return chromedp.Tasks{
		chromedp.Navigate(urlstr),
		chromedp.WaitReady(sel, chromedp.ByID),
		chromedp.Sleep(time.Second),
		pdf(res),
	}
}

func pdf(pdfbuf *[]byte) chromedp.Action {
	return chromedp.ActionFunc(func(ctx context.Context) error {
		buf, _, err := page.PrintToPDF().Do(ctx)
		if err != nil {
			return err
		}
		*pdfbuf = buf
		return nil
	})
}

@ndabAP

<3