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package caddyhugo
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import (
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"fmt"
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"image"
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"image/jpeg"
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"io"
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"net/http"
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"os"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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"github.com/nfnt/resize"
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)
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type MediaSource struct {
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StorageDir string
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ThumbDir string
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}
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func (ms *MediaSource) LocationOrig(m Media) string {
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return path.Join(ms.StorageDir, m.Name)
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}
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type Media struct {
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Type string
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Name string
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}
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func (ms *MediaSource) ThumbMax(m Media, maxDim int) (string, int, int, error) {
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f, err := os.Open(ms.LocationOrig(m))
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if err != nil {
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return "", 0, 0, err
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}
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defer f.Close()
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img, _, err := image.Decode(f)
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if err != nil {
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return "", 0, 0, err
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}
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rect := img.Bounds()
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width := rect.Dx()
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height := rect.Dy()
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if width > height {
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height = height * maxDim / width
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width = maxDim
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} else {
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width = width * maxDim / height
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height = maxDim
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}
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src, err := ms.ThumbImage(img, m, width, height)
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return src, width, height, err
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}
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func (ms *MediaSource) ByName(name string) *Media {
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return &Media{
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Type: "image",
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Name: name,
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}
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}
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func (ms *MediaSource) Thumb(m Media, width, height int) (string, error) {
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f, err := os.Open(ms.LocationOrig(m))
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if err != nil {
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return "", err
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}
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defer f.Close()
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img, _, err := image.Decode(f)
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if err != nil {
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return "", err
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}
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return ms.ThumbImage(img, m, width, height)
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}
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func (ms *MediaSource) ThumbImage(img image.Image, m Media, width, height int) (string, error) {
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thumbSlug := filepath.Join(m.Name, fmt.Sprintf("%d/%d.jpg", width, height))
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thumbLoc := filepath.Join(ms.ThumbDir, thumbSlug)
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os.MkdirAll(path.Dir(thumbLoc), 0755)
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fthumb, err := os.OpenFile(thumbLoc, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0655)
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if err != nil {
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return "", err
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}
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img = resize.Resize(uint(width), uint(height), img, resize.Bilinear)
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err = jpeg.Encode(fthumb, img, nil)
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if err != nil {
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return "", err
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}
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err = fthumb.Close()
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if err != nil {
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return "", err
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}
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return path.Join("/media", thumbSlug), nil
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}
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func (ms *MediaSource) Walk() ([]*Media, error) {
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var media []*Media
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err := filepath.Walk(ms.StorageDir, func(name string, fi os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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if fi.IsDir() {
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return nil
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}
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media = append(media, ms.ByName(path.Base(name)))
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return nil
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})
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return media, err
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}
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func (ch *CaddyHugo) serveMediaPage(w http.ResponseWriter, r *http.Request) (int, error) {
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if ch.Media == nil {
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http.NotFound(w, r)
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return 404, nil
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}
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io.WriteString(w, `<html>
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<head><style>.img { float: left; text-align: center; }</style></head>
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<body>
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`)
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if ch.Media != nil {
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media, err := ch.Media.Walk()
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return 500, nil
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}
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for _, m := range media {
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src, width, height, err := ch.Media.ThumbMax(*m, 100)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return 500, nil
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}
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fmt.Fprintf(w, `<div class="img"><img width=%d height=%d src=%q /><br /><input type="text" disabled value=%q /></div>`, width, height, src, src)
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}
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}
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io.WriteString(w, `</body><html>`)
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return 200, nil
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}
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func (ch *CaddyHugo) serveMedia(w http.ResponseWriter, r *http.Request) (int, error) {
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if ch.Media == nil {
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http.NotFound(w, r)
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return 404, nil
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}
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segs := strings.Split(r.URL.Path, "/")
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name := segs[2]
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file := ""
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var err error
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m := ch.Media.ByName(name)
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switch len(segs) {
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case 3:
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file = name
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case 4:
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var max int
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max, err = strconv.Atoi(removeExtension(segs[3]))
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if err != nil {
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http.Error(w, fmt.Sprintf("expected /media/filename, /media/filename/maxDim, or /media/filename/width/height..."), http.StatusBadRequest)
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return 400, nil
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}
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file, _, _, err = ch.Media.ThumbMax(*m, max)
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case 5:
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var width, height int
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width, err = strconv.Atoi(segs[3])
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if err != nil {
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http.Error(w, fmt.Sprintf("expected /media/filename, /media/filename/maxDim, or /media/filename/width/height.."), http.StatusBadRequest)
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return 400, nil
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}
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height, err = strconv.Atoi(removeExtension(segs[4]))
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if err != nil {
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http.Error(w, fmt.Sprintf("expected /media/filename, /media/filename/maxDim, or /media/filename/width/height."), http.StatusBadRequest)
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return 400, nil
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}
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file, err = ch.Media.Thumb(*m, width, height)
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default:
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http.Error(w, fmt.Sprintf("expected /media/filename, /media/filename/maxDim, or /media/filename/width/height"), http.StatusBadRequest)
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return 400, nil
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}
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if err != nil {
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http.Error(w, fmt.Sprintf("unable to load thumb"), http.StatusInternalServerError)
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return 500, nil
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}
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if file[0] == '/' {
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file = file[1:]
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}
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file = path.Join(ch.Media.ThumbDir, file[len("media/"):])
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http.ServeFile(w, r, file)
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return 200, nil
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}
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func removeExtension(name string) string {
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ext := path.Ext(name)
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return name[:len(name)-len(ext)]
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}
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