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responsive.go
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responsive.go
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package webpack
import (
"encoding/json"
"fmt"
"github.com/sirupsen/logrus"
"io/ioutil"
"path"
"path/filepath"
)
const responsiveFolder = "responsive"
var responsiveExtensions = map[string]bool{
".png": true,
".jpg": true,
}
// Responsive handles the overview logic of responsive images.
type Responsive struct {
generatedPath string
assetsFolder string
log logrus.FieldLogger
}
// NewResponsive returns a new instance of Responsive
func NewResponsive(generatedPath, assetsFolder string, log logrus.FieldLogger) *Responsive {
return &Responsive{generatedPath, assetsFolder, log}
}
// HasResponsiveExt returns true of the originalSrc's ext has responsive images
func HasResponsiveExt(originalSrc string) bool {
_, hasResponsive := responsiveExtensions[filepath.Ext(originalSrc)]
return hasResponsive
}
// GetResponsiveImage returns the ResponsiveImage of the given getResponsiveImage
func (r *Responsive) GetResponsiveImage(originalSrc string) *ResponsiveImage {
responsiveImage, err := r.getResponsiveImage(originalSrc)
if err != nil {
r.log.Errorf("GetResponsiveImage error: %v", err)
return nil
}
return responsiveImage
}
func (r *Responsive) getResponsiveImage(originalSrc string) (*ResponsiveImage, error) {
responsiveImage, err := r.readResponsiveImageJSON(originalSrc)
if err != nil {
return nil, err
}
responsiveImage.PrependSrcPath(r.assetsFolder, r.log)
return responsiveImage, nil
}
func (r *Responsive) readResponsiveImageJSON(originalSrc string) (*ResponsiveImage, error) {
filename := fmt.Sprintf("%v.json", path.Base(originalSrc))
filePath := path.Join(r.generatedPath, r.assetsFolder, path.Dir(originalSrc), responsiveFolder, filename)
bytes, err := ioutil.ReadFile(filePath)
if err != nil {
return nil, err
}
responsiveImage := &ResponsiveImage{}
err = json.Unmarshal(bytes, responsiveImage)
if err != nil {
return nil, err
}
return responsiveImage, nil
}