hugo-micropub/imagecompression.go

package main

import (
	tfgo "codeberg.org/jlelse/tinify"
	"errors"
	"io/ioutil"
	"os"
	"sort"
	"strings"
)

type ImageCompression interface {
	Compress(url string) (location string, err error)
}

// Tinify
type Tinify struct {
	// API Key
	key string
}

func (t Tinify) Compress(url string) (location string, err error) {
	fileExtension := func() string {
		spliced := strings.Split(url, ".")
		return spliced[len(spliced)-1]
	}()
	supportedTypes := []string{"jpg", "jpeg", "png"}
	sort.Strings(supportedTypes)
	i := sort.SearchStrings(supportedTypes, strings.ToLower(fileExtension))
	if !(i < len(supportedTypes) && supportedTypes[i] == strings.ToLower(fileExtension)) {
		err = errors.New("file not supported")
		return
	}
	tfgo.SetKey(t.key)
	s, e := tfgo.FromUrl(url)
	if e != nil {
		err = errors.New("failed to compress file")
		return
	}
	e = s.Resize(&tfgo.ResizeOption{
		Method: tfgo.ResizeMethodScale,
		Width:  2000,
	})
	if e != nil {
		err = errors.New("failed to resize file")
		return
	}
	file, e := ioutil.TempFile("", "tiny-*."+fileExtension)
	if e != nil {
		err = errors.New("failed to create temporary file")
		return
	}
	defer func() {
		_ = os.Remove(file.Name())
	}()
	e = s.ToFile(file.Name())
	if e != nil {
		err = errors.New("failed to save compressed file")
		return
	}
	hashFile, e := os.Open(file.Name())
	defer func() { _ = hashFile.Close() }()
	if e != nil {
		err = errors.New("failed to open temporary file")
		return
	}
	fileName, err := getSHA256(hashFile)
	if err != nil {
		return
	}
	location, err = SelectedMediaStorage.Upload(fileName+"."+fileExtension, file)
	return
}