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feat(chromium): add support for emulated media features in Chromium (#1474)

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Closes https://github.com/gotenberg/gotenberg/issues/1460

It can be easier to print a "clean" PDF of some pages if you emulate
media features like `prefers-reduced-motion`. Add support for that
emulation.
This commit is contained in:
Daniel Moran
2026-02-17 11:16:28 -08:00
committed by GitHub
parent 12c25a2d21
commit 82401bdfdd
8 changed files with 263 additions and 10 deletions
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34
pkg/modules/chromium/tasks.go
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@@ -423,26 +423,44 @@ func forceExactColorsActionFunc(logger *zap.Logger, printBackground bool) chrome
}
}
func emulateMediaTypeActionFunc(logger *zap.Logger, mediaType string) chromedp.ActionFunc {
func emulateMediaTypeActionFunc(logger *zap.Logger, mediaType string, mediaFeatures []EmulatedMediaFeature) chromedp.ActionFunc {
return func(ctx context.Context) error {
if mediaType == "" {
logger.Debug("no emulated media type")
if mediaType == "" && len(mediaFeatures) == 0 {
logger.Debug("no emulated media type or features")
return nil
}
if mediaType != "screen" && mediaType != "print" {
if mediaType != "" && mediaType != "screen" && mediaType != "print" {
return fmt.Errorf("validate emulated media type '%s': %w", mediaType, ErrInvalidEmulatedMediaType)
}
logger.Debug(fmt.Sprintf("emulate media type '%s'", mediaType))
emulatedMedia := emulation.SetEmulatedMedia()
err := emulatedMedia.WithMedia(mediaType).Do(ctx)
if mediaType != "" {
logger.Debug(fmt.Sprintf("emulate media type '%s'", mediaType))
emulatedMedia = emulatedMedia.WithMedia(mediaType)
}
if len(mediaFeatures) > 0 {
logger.Debug(fmt.Sprintf("emulate media features %+v", mediaFeatures))
features := make([]*emulation.MediaFeature, len(mediaFeatures))
for i, f := range mediaFeatures {
features[i] = &emulation.MediaFeature{
Name: f.Name,
Value: f.Value,
}
}
emulatedMedia = emulatedMedia.WithFeatures(features)
}
err := emulatedMedia.Do(ctx)
if err == nil {
return nil
}
return fmt.Errorf("emulate media type '%s': %w", mediaType, err)
return fmt.Errorf("emulate media: %w", err)
}
}