keyproofs/pkg/keyproofs/routes-avatar.go

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package keyproofs
import (
"context"
"crypto/md5"
"crypto/sha256"
"encoding/base64"
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"fmt"
"hash"
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"io"
"net/http"
"os"
"path/filepath"
"strconv"
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"strings"
"github.com/disintegration/imaging"
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"github.com/fsnotify/fsnotify"
"github.com/go-chi/chi"
"github.com/nullrocks/identicon"
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"github.com/rs/zerolog/log"
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"github.com/sour-is/keyproofs/pkg/graceful"
)
type avatarApp struct {
path string
}
func NewAvatarApp(ctx context.Context, path string) (*avatarApp, error) {
log := log.Ctx(ctx)
path = filepath.Clean(path)
app := &avatarApp{path: path}
err := app.CheckFiles(ctx)
if err != nil {
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return nil, fmt.Errorf("check files: %w", err)
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}
watch, err := fsnotify.NewWatcher()
if err != nil {
return nil, err
}
for _, typ := range []string{"avatar", "bg", "cover"} {
err = watch.Add(filepath.Join(path, typ))
if err != nil {
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return nil, fmt.Errorf("adding watch: %w", err)
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}
}
log.Debug().Msg("startup avatar watcher")
wg := graceful.WaitGroup(ctx)
wg.Go(func() error {
for {
select {
case <-ctx.Done():
log.Debug().Msg("shutdown avatar watcher")
return nil
case op := <-watch.Events:
log.Print(op)
switch op.Op {
case fsnotify.Create:
path = filepath.Dir(op.Name)
kind := filepath.Base(path)
name := filepath.Base(op.Name)
if err := app.createLinks(kind, name); err != nil {
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fmt.Println(err)
}
case fsnotify.Remove, fsnotify.Rename:
path = filepath.Dir(op.Name)
kind := filepath.Base(path)
name := filepath.Base(op.Name)
if err := app.removeLinks(kind, name); err != nil {
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log.Error().Err(err).Send()
}
default:
}
case err := <-watch.Errors:
fmt.Println(err)
}
}
})
return app, nil
}
func (app *avatarApp) CheckFiles(ctx context.Context) error {
log := log.Ctx(ctx)
for _, name := range []string{".links", "avatar", "bg", "cover"} {
log.Debug().Msgf("mkdir: %s", filepath.Join(app.path, name))
err := os.MkdirAll(filepath.Join(app.path, name), 0700)
if err != nil {
return err
}
}
return filepath.Walk(app.path, func(path string, info os.FileInfo, err error) error {
if err != nil {
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return fmt.Errorf("walk failed: %w", err)
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}
if info.IsDir() {
if info.Name() == ".links" {
return filepath.SkipDir
}
return nil
}
path = filepath.Dir(path)
kind := filepath.Base(path)
name := info.Name()
log.Debug().Msgf("link: %s %s %s", app.path, kind, name)
return app.createLinks(kind, name)
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})
}
func (app *avatarApp) get(w http.ResponseWriter, r *http.Request) {
log := log.Ctx(r.Context())
log.Print(r.Host)
kind := chi.URLParam(r, "kind")
hash := chi.URLParam(r, "hash")
sizeW, sizeH, resize := 0, 0, false
if s, err := strconv.Atoi(r.URL.Query().Get("s")); err == nil && s > 0 {
sizeW, sizeH, resize = sizeByKind(kind, s)
}
log.Debug().Int("width", sizeW).Int("height", sizeH).Bool("resize", resize).Str("kind", kind).Msg("Get Image")
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if strings.ContainsRune(hash, '@') {
avatarHost, _, err := styleSRV(r.Context(), hash)
if err != nil {
writeText(w, 500, err.Error())
return
}
hash = hashSHA256(strings.ToLower(hash))
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http.Redirect(w, r, fmt.Sprintf("https://%s/%s/%s?%s", avatarHost, kind, hash, r.URL.RawQuery), 301)
return
}
fname := filepath.Join(app.path, ".links", strings.Join([]string{kind, hash}, "-"))
log.Debug().Msgf("path: %s", fname)
if !fileExists(fname) {
switch kind {
case "avatar":
ig, err := identicon.New("sour.is", 5, 3)
if err != nil {
writeText(w, 500, err.Error())
return
}
ii, err := ig.Draw(hash)
if err != nil {
writeText(w, 500, err.Error())
return
}
w.Header().Set("Content-Type", "image/png")
w.WriteHeader(200)
err = ii.Png(clamp(128, 512, sizeW), w)
log.Error().Err(err).Send()
return
default:
sp := strings.SplitN(pixl, ",", 2)
b, _ := base64.RawStdEncoding.DecodeString(sp[1])
w.Header().Set("Content-Type", "image/png")
w.WriteHeader(200)
if _, err := w.Write(b); err != nil {
log.Error().Err(err).Send()
}
return
}
}
if !resize {
f, err := os.Open(fname)
if err != nil {
writeText(w, 500, err.Error())
return
}
w.Header().Set("Content-Type", "image/png")
w.WriteHeader(200)
_, err = io.Copy(w, f)
if err != nil {
log.Error().Err(err).Send()
}
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return
}
img, err := imaging.Open(fname, imaging.AutoOrientation(true))
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if err != nil {
writeText(w, 500, err.Error())
return
}
img = imaging.Fill(img, sizeW, sizeH, imaging.Center, imaging.Lanczos)
w.Header().Set("Content-Type", "image/png")
w.WriteHeader(200)
log.Debug().Msg("writing image")
err = imaging.Encode(w, img, imaging.PNG)
if err != nil {
log.Error().Err(err).Send()
}
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}
func (app *avatarApp) Routes(r *chi.Mux) {
r.MethodFunc("GET", "/{kind:avatar|bg|cover}/{hash}", app.get)
}
func hashString(value string, h hash.Hash) string {
_, _ = h.Write([]byte(value))
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return fmt.Sprintf("%x", h.Sum(nil))
}
func hashMD5(name string) string {
return hashString(name, md5.New())
}
func hashSHA256(name string) string {
return hashString(name, sha256.New())
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}
func (app *avatarApp) createLinks(kind, name string) error {
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if !strings.ContainsRune(name, '@') {
return nil
}
src := filepath.Join("..", kind, name)
name = strings.ToLower(name)
hash := hashMD5(name)
link := filepath.Join(app.path, ".links", strings.Join([]string{kind, hash}, "-"))
err := app.replaceLink(src, link)
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if err != nil {
return err
}
hash = hashSHA256(name)
link = filepath.Join(app.path, ".links", strings.Join([]string{kind, hash}, "-"))
err = app.replaceLink(src, link)
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return err
}
func (app *avatarApp) removeLinks(kind, name string) error {
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if !strings.ContainsRune(name, '@') {
return nil
}
name = strings.ToLower(name)
hash := hashMD5(name)
link := filepath.Join(app.path, ".links", strings.Join([]string{kind, hash}, "-"))
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err := os.Remove(link)
if err != nil {
return err
}
hash = hashSHA256(name)
link = filepath.Join(app.path, ".links", strings.Join([]string{kind, hash}, "-"))
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err = os.Remove(link)
return err
}
func (app *avatarApp) replaceLink(src, link string) error {
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if dst, err := os.Readlink(link); err != nil {
if os.IsNotExist(err) {
err = os.Symlink(src, link)
if err != nil {
return err
}
}
} else {
if dst != src {
err = os.Remove(link)
if err != nil {
return err
}
err = os.Symlink(src, link)
if err != nil {
return err
}
}
}
return nil
}
func fileExists(filename string) bool {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}
func sizeByKind(kind string, size int) (sizeW int, sizeH int, resize bool) {
switch kind {
case "avatar":
if size == 0 {
size = 128
}
sizeW = clamp(128, 640, size)
sizeH = sizeW
resize = true
return
case "cover":
if size == 0 {
size = 940
}
sizeW = clamp(640, 1300, size)
sizeH = ratio(sizeW, 2.7)
resize = true
return
default:
return 0, 0, false
}
}
func ratio(size int, ratio float64) int {
return int(float64(size) / ratio)
}
func clamp(min, max, size int) int {
if size > max {
return max
}
if size < min {
return min
}
return size
}