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avatar.go
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avatar.go
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// Package avatar implements avatart proxy for oauth and
// defines store interface and implements local (fs), gridfs (mongo) and boltdb stores.
package avatar
import (
"bytes"
"crypto/md5" //nolint gosec
"encoding/hex"
"fmt"
"image"
"image/png"
"io"
"net/http"
"strconv"
"strings"
"time"
"github.com/go-pkgz/rest"
"github.com/nullrocks/identicon"
"github.com/pkg/errors"
"golang.org/x/image/draw"
"github.com/go-pkgz/auth/logger"
"github.com/go-pkgz/auth/token"
)
// Proxy provides http handler for avatars from avatar.Store
// On user login token will call Put and it will retrieve and save picture locally.
type Proxy struct {
logger.L
Store Store
RoutePath string
URL string
ResizeLimit int
}
// Put stores retrieved avatar to avatar.Store. Gets image from user info. Returns proxied url
func (p *Proxy) Put(u token.User, client *http.Client) (avatarURL string, err error) {
genIdenticon := func(userID string) (avatarURL string, err error) {
b, e := GenerateAvatar(userID)
if e != nil {
return "", errors.Wrapf(e, "no picture for %s", userID)
}
// put returns avatar base name, like 123456.image
avatarID, e := p.Store.Put(userID, p.resize(bytes.NewBuffer(b), p.ResizeLimit))
if e != nil {
return "", err
}
p.Logf("[DEBUG] saved identicon avatar to %s, user %q", avatarID, u.Name)
return p.URL + p.RoutePath + "/" + avatarID, nil
}
// no picture for user, try to generate identicon avatar
if u.Picture == "" {
return genIdenticon(u.ID)
}
body, err := p.load(u.Picture, client)
if err != nil {
p.Logf("[DEBUG] failed to fetch avatar from the orig %s, %v", u.Picture, err)
return genIdenticon(u.ID)
}
defer func() {
if e := body.Close(); e != nil {
p.Logf("[WARN] can't close response body, %s", e)
}
}()
avatarID, err := p.Store.Put(u.ID, p.resize(body, p.ResizeLimit)) // put returns avatar base name, like 123456.image
if err != nil {
return "", err
}
p.Logf("[DEBUG] saved avatar from %s to %s, user %q", u.Picture, avatarID, u.Name)
return p.URL + p.RoutePath + "/" + avatarID, nil
}
// load avatar from remote url and return body. Caller has to close the reader
func (p *Proxy) load(url string, client *http.Client) (rc io.ReadCloser, err error) {
// load avatar from remote location
var resp *http.Response
err = retry(5, time.Second, func() error {
var e error
resp, e = client.Get(url)
return e
})
if err != nil {
return nil, errors.Wrap(err, "failed to fetch avatar from the orig")
}
if resp.StatusCode != http.StatusOK {
_ = resp.Body.Close() // caller won't close on error
return nil, errors.Errorf("failed to get avatar from the orig, status %s", resp.Status)
}
return resp.Body, nil
}
// Handler returns token routes for given provider
func (p *Proxy) Handler(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
w.WriteHeader(http.StatusMethodNotAllowed)
}
elems := strings.Split(r.URL.Path, "/")
avatarID := elems[len(elems)-1]
if !reValidAvatarID.MatchString(avatarID) {
rest.SendErrorJSON(w, r, p.L, http.StatusForbidden, fmt.Errorf("invalid avatar id from %s", r.URL.Path), "can't load avatar")
return
}
// enforce client-side caching
etag := `"` + p.Store.ID(avatarID) + `"`
w.Header().Set("Etag", etag)
w.Header().Set("Cache-Control", "max-age=604800") // 7 days
if match := r.Header.Get("If-None-Match"); match != "" {
etag = strings.TrimPrefix(etag, `"`)
etag = strings.TrimSuffix(etag, `"`)
if match == etag {
w.WriteHeader(http.StatusNotModified)
return
}
}
avReader, size, err := p.Store.Get(avatarID)
if err != nil {
rest.SendErrorJSON(w, r, p.L, http.StatusBadRequest, err, "can't load avatar")
return
}
defer func() {
if e := avReader.Close(); e != nil {
p.Logf("[WARN] can't close avatar reader for %s, %s", avatarID, e)
}
}()
w.Header().Set("Content-Type", "image/*")
w.Header().Set("Content-Length", strconv.Itoa(size))
w.WriteHeader(http.StatusOK)
if _, err = io.Copy(w, avReader); err != nil {
p.Logf("[WARN] can't send response to %s, %s", r.RemoteAddr, err)
}
}
// resize an image of supported format (PNG, JPG, GIF) to the size of "limit" px of the biggest side
// (width or height) preserving aspect ratio.
// Returns original reader if resizing is not needed or failed.
func (p *Proxy) resize(reader io.Reader, limit int) io.Reader {
if reader == nil {
p.Logf("[WARN] avatar resize(): reader is nil")
return nil
}
if limit <= 0 {
p.Logf("[DEBUG] avatar resize(): limit should be greater than 0")
return reader
}
var teeBuf bytes.Buffer
tee := io.TeeReader(reader, &teeBuf)
src, _, err := image.Decode(tee)
if err != nil {
p.Logf("[WARN] avatar resize(): can't decode avatar image, %s", err)
return &teeBuf
}
bounds := src.Bounds()
w, h := bounds.Dx(), bounds.Dy()
if w <= limit && h <= limit || w <= 0 || h <= 0 {
p.Logf("[DEBUG] resizing image is smaller that the limit or has 0 size")
return &teeBuf
}
newW, newH := w*limit/h, limit
if w > h {
newW, newH = limit, h*limit/w
}
m := image.NewRGBA(image.Rect(0, 0, newW, newH))
// Slower than `draw.ApproxBiLinear.Scale()` but better quality.
draw.BiLinear.Scale(m, m.Bounds(), src, src.Bounds(), draw.Src, nil)
var out bytes.Buffer
if err = png.Encode(&out, m); err != nil {
p.Logf("[WARN] avatar resize(): can't encode resized avatar to PNG, %s", err)
return &teeBuf
}
return &out
}
// GenerateAvatar for give user with identicon
func GenerateAvatar(user string) ([]byte, error) {
iconGen, err := identicon.New("pkgz/auth", 5, 5)
if err != nil {
return nil, errors.Wrap(err, "can't create identicon service")
}
ii, err := iconGen.Draw(user) // generate an IdentIcon
if err != nil {
return nil, errors.Wrapf(err, "failed to draw avatar for %s", user)
}
buf := &bytes.Buffer{}
err = ii.Png(300, buf)
return buf.Bytes(), err
}
// GetGravatarURL returns url to gravatar picture for given email
func GetGravatarURL(email string) (res string, err error) {
hash := md5.Sum([]byte(email))
hexHash := hex.EncodeToString(hash[:])
client := http.Client{Timeout: 1 * time.Second}
res = "https://www.gravatar.com/avatar/" + hexHash + ".jpg"
resp, err := client.Get(res + "?d=404&s=80")
if err != nil {
return "", err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return "", errors.New(resp.Status)
}
return res, nil
}
func retry(retries int, delay time.Duration, fn func() error) (err error) {
for i := 0; i < retries; i++ {
if err = fn(); err == nil {
return nil
}
time.Sleep(delay)
}
return errors.Wrap(err, "retry failed")
}