94 lines
1.9 KiB
Go
94 lines
1.9 KiB
Go
package main
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import (
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_ "embed"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"math/rand"
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"net/http"
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"os"
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"strings"
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"time"
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)
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//go:embed public/index.html
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var indexSrc string
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const PORT = 3000
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const CACHE_TTL = 5 * time.Minute
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const STORAGE_URL = "https://storage.bunnycdn.com/lilou-cat/"
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const CDN_URL = "https://lilou-cat.b-cdn.net/"
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type Image struct {
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ObjectName string
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}
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var (
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cachedImages []string
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cacheExpiration time.Time
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)
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func list_images() []string {
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if time.Now().Before(cacheExpiration) {
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return cachedImages
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}
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req, _ := http.NewRequest("GET", STORAGE_URL, nil)
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req.Header.Add("Accept", "application/json")
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req.Header.Add("AccessKey", os.Getenv("API_KEY"))
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res, err := http.DefaultClient.Do(req)
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if err != nil {
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fmt.Printf("error: %s\n", err)
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return []string{}
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}
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var images = []Image{}
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err = json.NewDecoder(res.Body).Decode(&images)
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defer res.Body.Close()
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if err != nil {
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fmt.Printf("error: %s\n", err)
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return []string{}
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}
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var imageUrls = []string{}
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for _, image := range images {
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imageUrls = append(imageUrls, fmt.Sprintf("%s/%s", CDN_URL, image.ObjectName))
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}
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cachedImages = imageUrls
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cacheExpiration = time.Now().Add(CACHE_TTL)
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return imageUrls
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}
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func getPage(w http.ResponseWriter, r *http.Request) {
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var images = list_images()
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var image = images[rand.Intn(len(images))]
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src := strings.Replace(indexSrc, "{{ IMAGE_URL }}", image, 1)
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io.WriteString(w, src)
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}
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func getFavicon(w http.ResponseWriter, r *http.Request) {
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http.ServeFile(w, r, "public/favicon.ico")
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}
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func main() {
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http.HandleFunc("/", getPage)
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http.HandleFunc("/favicon.ico", getFavicon)
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err := http.ListenAndServe(fmt.Sprintf(":%d", PORT), nil)
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fmt.Printf("listening on port %d\n", PORT)
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if errors.Is(err, http.ErrServerClosed) {
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fmt.Printf("server closed\n")
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} else if err != nil {
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fmt.Printf("error starting server: %s\n", err)
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os.Exit(1)
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}
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}
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