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caddy-hugo2/media/media.go

320 lines
5.7 KiB

package media
import (
"fmt"
"image"
"image/jpeg"
"io"
"os"
"path"
"path/filepath"
"regexp"
"sort"
"strconv"
"time"
// for processing images
_ "image/gif"
_ "image/png"
"github.com/nfnt/resize"
"github.com/tajtiattila/metadata"
)
type MediaSource struct {
StorageDir string
ThumbDir string
set Set
}
type Media struct {
Type string
Name string
Size image.Rectangle
FullName string
metadata *metadata.Metadata
}
func (ms *MediaSource) LocationOrig(m Media) string {
return path.Join(ms.StorageDir, m.Name)
}
func (ms *MediaSource) ThumbPath(m Media, size image.Rectangle) string {
w := size.Dx()
h := size.Dy()
var ws, hs string
if w != 0 {
ws = fmt.Sprint(w)
}
if h != 0 {
hs = fmt.Sprint(h)
}
thumbSlug := filepath.Join(fmt.Sprintf("%sx%s", ws, hs), m.Name)
return path.Join("/media", thumbSlug)
}
func (ms *MediaSource) ThumbFilename(m Media, size image.Rectangle) string {
return filepath.Join(ms.ThumbDir, ms.ThumbPath(m, size))
}
func (ms *MediaSource) ReceiveNewMedia(name string, r io.Reader) error {
ms.set = nil
dest := path.Join(ms.StorageDir, name)
f, err := os.OpenFile(dest, os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return err
}
_, err = io.Copy(f, r)
if err != nil {
return err
}
return f.Close()
}
func (m *Media) Date() time.Time {
m.getMetadata()
if m.metadata != nil {
raw := m.metadata.Get(metadata.DateTimeOriginal)
if raw != "" {
d, err := time.Parse("2006-01-02T15:04:05", raw)
if err == nil {
return d
}
}
}
fi, err := os.Stat(m.FullName)
if err == nil {
return fi.ModTime()
}
return time.Time{}
}
func (m *Media) getMetadata() error {
if m.metadata != nil {
return nil
}
f, err := os.Open(m.FullName)
if err != nil {
return err
}
md, err := metadata.Parse(f)
if err != nil {
return err
}
m.metadata = md
return nil
}
func (ms *MediaSource) Size(name string) (image.Rectangle, error) {
f, err := os.Open(name)
if err != nil {
return image.ZR, err
}
defer f.Close()
cfg, _, err := image.DecodeConfig(f)
if err != nil {
return image.ZR, err
}
width := cfg.Width
height := cfg.Height
return image.Rect(0, 0, width, height), nil
}
func (ms *MediaSource) ThumbMax(m Media, maxDim int) (string, image.Rectangle, error) {
f, err := os.Open(ms.LocationOrig(m))
if err != nil {
return "", image.ZR, err
}
defer f.Close()
cfg, _, err := image.DecodeConfig(f)
if err != nil {
return "", image.ZR, err
}
width := cfg.Width
height := cfg.Height
if width > height {
height = height * maxDim / width
width = maxDim
} else {
width = width * maxDim / height
height = maxDim
}
size := image.Rect(0, 0, width, height)
if ms.HasThumb(m, size) {
return ms.ThumbPath(m, size), size, nil
}
_, err = f.Seek(0, io.SeekStart)
if err != nil {
return "", image.ZR, err
}
src, err := ms.thumbReader(f, m, size)
return src, size, err
}
func (ms *MediaSource) HasThumb(m Media, size image.Rectangle) bool {
fi, err := os.Stat(ms.ThumbFilename(m, size))
if err != nil {
return false
}
return m.Date().Before(fi.ModTime())
}
func (ms *MediaSource) ByName(name string) *Media {
size, _ := ms.Size(path.Join(ms.StorageDir, name))
m := Media{
Type: "image",
Name: name,
Size: size,
}
m.FullName = ms.LocationOrig(m)
return &m
}
func (ms *MediaSource) Thumb(m Media, size image.Rectangle) (string, error) {
if ms.HasThumb(m, size) {
return ms.ThumbPath(m, size), nil
}
f, err := os.Open(ms.LocationOrig(m))
if err != nil {
return "", err
}
defer f.Close()
return ms.thumbReader(f, m, size)
}
func (ms *MediaSource) thumbReader(r io.Reader, m Media, size image.Rectangle) (string, error) {
img, _, err := image.Decode(r)
if err != nil {
return "", err
}
return ms.ThumbImage(img, m, size)
}
func (ms *MediaSource) ThumbImage(img image.Image, m Media, size image.Rectangle) (string, error) {
thumbLoc := ms.ThumbFilename(m, size)
os.MkdirAll(path.Dir(thumbLoc), 0755)
fthumb, err := os.OpenFile(thumbLoc, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0655)
if err != nil {
return "", err
}
img = resize.Resize(uint(size.Dx()), uint(size.Dy()), img, resize.Bilinear)
err = jpeg.Encode(fthumb, img, nil)
if err != nil {
return "", err
}
err = fthumb.Close()
if err != nil {
return "", err
}
return ms.ThumbPath(m, size), nil
}
func (ms *MediaSource) Walk() ([]*Media, error) {
if ms.set == nil {
var media []*Media
err := filepath.Walk(ms.StorageDir, func(name string, fi os.FileInfo, err error) error {
if err != nil {
return err
}
if fi.IsDir() {
return nil
}
media = append(media, ms.ByName(path.Base(name)))
return nil
})
if err != nil {
return media, err
}
ms.set = media
}
return ms.set, nil
}
type Set []*Media
func (s Set) ByDate() Set {
sort.Slice(s, func(i, j int) bool {
return s[i].Date().After(s[j].Date())
})
return s
}
var (
sizeString = regexp.MustCompile(`([0-9]*)(x)?([0-9]*)`)
)
func ParseSizeString(str string, actual image.Rectangle) (image.Rectangle, error) {
var err = fmt.Errorf("expected a size string {width}x{height}, saw %q", str)
strs := sizeString.FindStringSubmatch(str)
if len(strs) < 4 {
return image.ZR, err
}
var w, h int
var strconvErr error
if strs[1] != "" {
w, strconvErr = strconv.Atoi(strs[1])
if strconvErr != nil {
return image.ZR, err
}
}
if strs[3] != "" {
h, strconvErr = strconv.Atoi(strs[3])
if strconvErr != nil {
return image.ZR, err
}
}
if strs[2] != "x" {
// w was the only dimension given, so set it to the greater dimension
// of the actual image size
if actual.Dx() > actual.Dy() {
h = 0
} else {
h = w
w = 0
}
}
return image.Rect(0, 0, w, h), nil
}
func removeExtension(name string) string {
ext := path.Ext(name)
return name[:len(name)-len(ext)]
}