grafana/grafana-kiosk

package kiosk

import (
    "fmt"
    "log"
    "net/url"
    "runtime"
    "strings"

    "github.com/chromedp/chromedp"
)

// GenerateURL constructs URL with appropriate parameters for kiosk mode.
func GenerateURL(anURL string, kioskMode string, autoFit bool, isPlayList bool) string {
    parsedURI, _ := url.ParseRequestURI(anURL)
    parsedQuery, _ := url.ParseQuery(parsedURI.RawQuery)

    switch kioskMode {
    case "tv": // TV
        parsedQuery.Set("kiosk", "tv") // no sidebar, topnav without buttons
        log.Printf("KioskMode: TV")
    case "full": // FULLSCREEN
        parsedQuery.Set("kiosk", "1") // sidebar and topnav always shown
        log.Printf("KioskMode: Fullscreen")
    case "disabled": // FULLSCREEN
        log.Printf("KioskMode: Disabled")
    default: // disabled
        parsedQuery.Set("kiosk", "1") // sidebar and topnav always shown
        log.Printf("KioskMode: Fullscreen")
    }
    // a playlist should also go inactive immediately
    if isPlayList {
        parsedQuery.Set("inactive", "1")
    }
    parsedURI.RawQuery = parsedQuery.Encode()
    // grafana is not parsing autofitpanels that uses an equals sign, so leave it out
    if autoFit {
        if len(parsedQuery) > 0 {
            parsedURI.RawQuery += "&autofitpanels"
        } else {
            parsedURI.RawQuery += "autofitpanels"
        }
    }

    return parsedURI.String()
}

func generateExecutorOptions(dir string, cfg *Config) []chromedp.ExecAllocatorOption {
    // agent should not have the v prefix
    buildVersion := strings.TrimPrefix(cfg.BuildInfo.Version, "v")
    kioskVersion := fmt.Sprintf("GrafanaKiosk/%s (%s %s)", buildVersion, runtime.GOOS, runtime.GOARCH)
    userAgent := fmt.Sprintf("Mozilla/5.0 (X11; CrOS armv7l 13597.84.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36 %s", kioskVersion)

    // See https://peter.sh/experiments/chromium-command-line-switches/

    // --start-fullscreen
    //    Specifies if the browser should start in fullscreen mode, like if the user had pressed F11 right after startup. ↪
    // --start-maximized
    //    Starts the browser maximized, regardless of any previous settings
    // --disable-gpu
    //    Disables GPU hardware acceleration. If software renderer is not in place, then the GPU process won't launch.--disable-gpu

    execAllocatorOption := []chromedp.ExecAllocatorOption{
        chromedp.NoFirstRun,
        chromedp.NoDefaultBrowserCheck,
        chromedp.Flag("autoplay-policy", "no-user-gesture-required"),
        chromedp.Flag("bwsi", true),
        chromedp.Flag("check-for-update-interval", "31536000"),
        chromedp.Flag("disable-features", "Translate"),
        chromedp.Flag("disable-notifications", true),
        chromedp.Flag("disable-overlay-scrollbar", true),
        chromedp.Flag("disable-sync", true),
        chromedp.Flag("ignore-certificate-errors", cfg.Target.IgnoreCertificateErrors),
        chromedp.Flag("incognito", true),
        chromedp.Flag("kiosk", true),
        chromedp.Flag("noerrdialogs", true),
        chromedp.Flag("start-fullscreen", true),
        chromedp.Flag("start-maximized", true),
        chromedp.Flag("user-agent", userAgent),
        chromedp.Flag("window-position", cfg.General.WindowPosition),
        chromedp.UserDataDir(dir),
    }

    if !cfg.General.GPUEnabled {
        execAllocatorOption = append(
            execAllocatorOption,
            chromedp.Flag("disable-gpu", cfg.General.GPUEnabled))
    }
    if cfg.General.OzonePlatform != "" {
        execAllocatorOption = append(
            execAllocatorOption,
            chromedp.Flag("ozone-platform", cfg.General.OzonePlatform))
    }
    if cfg.General.WindowSize != "" {
        execAllocatorOption = append(
            execAllocatorOption,
            chromedp.Flag("window-size", cfg.General.WindowSize))
    }
    if cfg.General.ScaleFactor != "" {
        execAllocatorOption = append(
            execAllocatorOption,
            chromedp.Flag("force-device-scale-factor", cfg.General.ScaleFactor))
    }

    return execAllocatorOption
}