99 lines
2.1 KiB
Go
99 lines
2.1 KiB
Go
package main
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import (
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"bytes"
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"encoding/json"
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"flag"
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"io"
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"log"
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"net/http"
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"os"
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"path/filepath"
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"github.com/disintegration/imaging"
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)
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func main() {
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headerImages := flag.String("i", "data/pending-header-images.json", "header images json file")
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currentPendingImage := flag.String("curr-image-data", "", "current header image URL")
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targetFile := flag.String("o", "out.jpg", "target file")
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odFile := flag.String("out-data", "out-data.json", "target file data")
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flag.Parse()
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pis, err := LoadPendingImages(*headerImages)
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if err != nil {
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log.Fatal(err)
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}
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pi, ok := pis.FindPendingImage()
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if !ok {
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log.Println("no pending image found")
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return
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}
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log.Printf("found pending image: %s\n", pi.URL)
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if *currentPendingImage != "" {
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if cpi, err := LoadPendingImageFromURL(*currentPendingImage); err == nil {
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if pi.URL == cpi.URL {
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log.Println("current pending image is already the latest")
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return
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}
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} else {
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log.Printf("warn: failed to load current pending image: %s\n", err)
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}
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}
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if err := fetchHeaderImageFromURL(*targetFile, pi); err != nil {
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log.Fatal(err)
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}
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// Write out the current pending image to the data file
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var dBfr bytes.Buffer
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if err := json.NewEncoder(&dBfr).Encode(pi); err != nil {
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log.Fatal(err)
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}
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if err := os.WriteFile(*odFile, dBfr.Bytes(), 0644); err != nil {
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log.Fatal(err)
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}
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}
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func fetchHeaderImageFromURL(outFile string, pi PendingImage) error {
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var bfr bytes.Buffer
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if err := fetchHeaderImage(&bfr, pi.URL); err != nil {
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log.Fatal(err)
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}
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img, err := imaging.Decode(&bfr, imaging.AutoOrientation(true))
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if err != nil {
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log.Fatal(err)
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}
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rImg := imaging.Resize(img, 1280, 0, imaging.Lanczos)
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if pi.Crop == CropBottom {
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rImg = imaging.CropAnchor(rImg, rImg.Bounds().Dx(), rImg.Bounds().Dy()/2, imaging.Bottom)
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}
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if err := os.MkdirAll(filepath.Dir(outFile), 0755); err != nil {
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log.Fatal(err)
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}
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if err := imaging.Save(rImg, outFile, imaging.JPEGQuality(70)); err != nil {
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log.Fatal(err)
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}
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return nil
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}
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func fetchHeaderImage(w io.Writer, url string) error {
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r, err := http.Get(url)
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if err != nil {
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return err
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}
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defer r.Body.Close()
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_, err = io.Copy(w, r.Body)
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return err
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}
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