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				|  |  | +// Copyright 2014 The Gogs Authors. All rights reserved.
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				|  |  | +// Use of this source code is governed by a MIT-style
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				|  |  | +// license that can be found in the LICENSE file.
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				|  |  | +
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				|  |  | +// for www.gravatar.com image cache
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				|  |  | +package avatar
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				|  |  | +
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				|  |  | +import (
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				|  |  | +	"crypto/md5"
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				|  |  | +	"encoding/hex"
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				|  |  | +	"errors"
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				|  |  | +	"fmt"
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				|  |  | +	"image"
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				|  |  | +	"image/jpeg"
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				|  |  | +	"image/png"
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				|  |  | +	"io"
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				|  |  | +	"log"
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				|  |  | +	"net/http"
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				|  |  | +	"net/url"
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				|  |  | +	"os"
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				|  |  | +	"path/filepath"
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				|  |  | +	"strings"
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				|  |  | +	"sync"
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				|  |  | +	"time"
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				|  |  | +
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				|  |  | +	"github.com/nfnt/resize"
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				|  |  | +)
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				|  |  | +
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				|  |  | +var (
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				|  |  | +	gravatar = "http://www.gravatar.com/avatar"
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				|  |  | +)
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				|  |  | +
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				|  |  | +func debug(a ...interface{}) {
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				|  |  | +	if true {
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				|  |  | +		log.Println(a...)
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				|  |  | +	}
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				|  |  | +}
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				|  |  | +
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				|  |  | +// hash email to md5 string
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				|  |  | +// keep this func in order to make this package indenpent
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				|  |  | +func HashEmail(email string) string {
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				|  |  | +	h := md5.New()
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				|  |  | +	h.Write([]byte(strings.ToLower(email)))
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				|  |  | +	return hex.EncodeToString(h.Sum(nil))
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				|  |  | +}
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				|  |  | +
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				|  |  | +type Avatar struct {
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				|  |  | +	Hash           string
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				|  |  | +	AlterImage     string // image path
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				|  |  | +	cacheDir       string // image save dir
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				|  |  | +	reqParams      string
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				|  |  | +	imagePath      string
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				|  |  | +	expireDuration time.Duration
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				|  |  | +}
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				|  |  | +
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				|  |  | +func New(hash string, cacheDir string) *Avatar {
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				|  |  | +	return &Avatar{
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				|  |  | +		Hash:           hash,
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				|  |  | +		cacheDir:       cacheDir,
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				|  |  | +		expireDuration: time.Minute * 10,
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				|  |  | +		reqParams: url.Values{
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				|  |  | +			"d":    {"retro"},
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				|  |  | +			"size": {"200"},
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				|  |  | +			"r":    {"pg"}}.Encode(),
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				|  |  | +		imagePath: filepath.Join(cacheDir, hash+".image"), //maybe png or jpeg
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				|  |  | +	}
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				|  |  | +}
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				|  |  | +
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				|  |  | +func (this *Avatar) HasCache() bool {
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				|  |  | +	fileInfo, err := os.Stat(this.imagePath)
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				|  |  | +	return err == nil && fileInfo.Mode().IsRegular()
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				|  |  | +}
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				|  |  | +
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				|  |  | +func (this *Avatar) Modtime() (modtime time.Time, err error) {
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				|  |  | +	fileInfo, err := os.Stat(this.imagePath)
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				|  |  | +	if err != nil {
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				|  |  | +		return
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				|  |  | +	}
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				|  |  | +	return fileInfo.ModTime(), nil
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				|  |  | +}
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				|  |  | +
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				|  |  | +func (this *Avatar) Expired() bool {
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				|  |  | +	modtime, err := this.Modtime()
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				|  |  | +	return err != nil || time.Since(modtime) > this.expireDuration
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				|  |  | +}
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				|  |  | +
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				|  |  | +// default image format: jpeg
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				|  |  | +func (this *Avatar) Encode(wr io.Writer, size int) (err error) {
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				|  |  | +	var img image.Image
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				|  |  | +	decodeImageFile := func(file string) (img image.Image, err error) {
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				|  |  | +		fd, err := os.Open(file)
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				|  |  | +		if err != nil {
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				|  |  | +			return
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				|  |  | +		}
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				|  |  | +		defer fd.Close()
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				|  |  | +		img, err = jpeg.Decode(fd)
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				|  |  | +		if err != nil {
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				|  |  | +			fd.Seek(0, os.SEEK_SET)
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				|  |  | +			img, err = png.Decode(fd)
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				|  |  | +		}
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				|  |  | +		return
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				|  |  | +	}
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				|  |  | +	imgPath := this.imagePath
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				|  |  | +	if !this.HasCache() {
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				|  |  | +		if this.AlterImage == "" {
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				|  |  | +			return errors.New("request image failed, and no alt image offered")
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				|  |  | +		}
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				|  |  | +		imgPath = this.AlterImage
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				|  |  | +	}
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				|  |  | +	img, err = decodeImageFile(imgPath)
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				|  |  | +	if err != nil {
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				|  |  | +		return
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				|  |  | +	}
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				|  |  | +	m := resize.Resize(uint(size), 0, img, resize.Lanczos3)
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				|  |  | +	return jpeg.Encode(wr, m, nil)
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				|  |  | +}
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				|  |  | +
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				|  |  | +// get image from gravatar.com
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				|  |  | +func (this *Avatar) Update() {
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				|  |  | +	thunder.Fetch(gravatar+"/"+this.Hash+"?"+this.reqParams,
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				|  |  | +		this.imagePath)
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				|  |  | +}
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				|  |  | +
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				|  |  | +func (this *Avatar) UpdateTimeout(timeout time.Duration) error {
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				|  |  | +	var err error
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				|  |  | +	select {
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				|  |  | +	case <-time.After(timeout):
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				|  |  | +		err = errors.New("get gravatar image timeout")
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				|  |  | +	case err = <-thunder.GoFetch(gravatar+"/"+this.Hash+"?"+this.reqParams,
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				|  |  | +		this.imagePath):
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				|  |  | +	}
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				|  |  | +	return err
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				|  |  | +}
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				|  |  | +
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				|  |  | +type avatarHandler struct {
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				|  |  | +	cacheDir string
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				|  |  | +	altImage string
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				|  |  | +}
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				|  |  | +
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				|  |  | +func (this *avatarHandler) mustInt(r *http.Request, defaultValue int, keys ...string) int {
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				|  |  | +	var v int
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				|  |  | +	for _, k := range keys {
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				|  |  | +		if _, err := fmt.Sscanf(r.FormValue(k), "%d", &v); err == nil {
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				|  |  | +			defaultValue = v
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				|  |  | +		}
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				|  |  | +	}
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				|  |  | +	return defaultValue
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				|  |  | +}
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				|  |  | +
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				|  |  | +func (this *avatarHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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				|  |  | +	urlPath := r.URL.Path
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				|  |  | +	hash := urlPath[strings.LastIndex(urlPath, "/")+1:]
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				|  |  | +	//hash = HashEmail(hash)
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				|  |  | +	size := this.mustInt(r, 80, "s", "size") // size = 80*80
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				|  |  | +
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				|  |  | +	avatar := New(hash, this.cacheDir)
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				|  |  | +	avatar.AlterImage = this.altImage
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				|  |  | +	if avatar.Expired() {
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				|  |  | +		err := avatar.UpdateTimeout(time.Millisecond * 500)
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				|  |  | +		if err != nil {
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				|  |  | +			debug(err)
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				|  |  | +			//log.Trace("avatar update error: %v", err)
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				|  |  | +		}
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				|  |  | +	}
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				|  |  | +	if modtime, err := avatar.Modtime(); err == nil {
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				|  |  | +		etag := fmt.Sprintf("size(%d)", size)
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				|  |  | +		if t, err := time.Parse(http.TimeFormat, r.Header.Get("If-Modified-Since")); err == nil && modtime.Before(t.Add(1*time.Second)) && etag == r.Header.Get("If-None-Match") {
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				|  |  | +			h := w.Header()
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				|  |  | +			delete(h, "Content-Type")
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				|  |  | +			delete(h, "Content-Length")
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				|  |  | +			w.WriteHeader(http.StatusNotModified)
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				|  |  | +			return
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				|  |  | +		}
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				|  |  | +		w.Header().Set("Last-Modified", modtime.UTC().Format(http.TimeFormat))
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				|  |  | +		w.Header().Set("ETag", etag)
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				|  |  | +	}
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				|  |  | +	w.Header().Set("Content-Type", "image/jpeg")
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				|  |  | +	err := avatar.Encode(w, size)
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				|  |  | +	if err != nil {
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				|  |  | +		//log.Warn("avatar encode error: %v", err) // will panic when err != nil
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				|  |  | +		debug(err)
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				|  |  | +		w.WriteHeader(500)
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				|  |  | +	}
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				|  |  | +}
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				|  |  | +
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				|  |  | +// http.Handle("/avatar/", avatar.HttpHandler("./cache"))
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				|  |  | +func HttpHandler(cacheDir string, defaultImgPath string) http.Handler {
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				|  |  | +	return &avatarHandler{
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				|  |  | +		cacheDir: cacheDir,
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				|  |  | +		altImage: defaultImgPath,
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				|  |  | +	}
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				|  |  | +}
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				|  |  | +
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				|  |  | +// thunder downloader
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				|  |  | +var thunder = &Thunder{QueueSize: 10}
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				|  |  | +
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				|  |  | +type Thunder struct {
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				|  |  | +	QueueSize int // download queue size
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				|  |  | +	q         chan *thunderTask
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				|  |  | +	once      sync.Once
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				|  |  | +}
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				|  |  | +
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				|  |  | +func (t *Thunder) init() {
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				|  |  | +	if t.QueueSize < 1 {
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				|  |  | +		t.QueueSize = 1
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				|  |  | +	}
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				|  |  | +	t.q = make(chan *thunderTask, t.QueueSize)
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				|  |  | +	for i := 0; i < t.QueueSize; i++ {
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				|  |  | +		go func() {
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				|  |  | +			for {
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				|  |  | +				task := <-t.q
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				|  |  | +				task.Fetch()
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				|  |  | +			}
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				|  |  | +		}()
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				|  |  | +	}
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				|  |  | +}
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				|  |  | +
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				|  |  | +func (t *Thunder) Fetch(url string, saveFile string) error {
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				|  |  | +	t.once.Do(t.init)
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				|  |  | +	task := &thunderTask{
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				|  |  | +		Url:      url,
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				|  |  | +		SaveFile: saveFile,
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				|  |  | +	}
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				|  |  | +	task.Add(1)
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				|  |  | +	t.q <- task
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				|  |  | +	task.Wait()
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				|  |  | +	return task.err
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				|  |  | +}
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				|  |  | +
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				|  |  | +func (t *Thunder) GoFetch(url, saveFile string) chan error {
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				|  |  | +	c := make(chan error)
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				|  |  | +	go func() {
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				|  |  | +		c <- t.Fetch(url, saveFile)
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				|  |  | +	}()
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				|  |  | +	return c
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				|  |  | +}
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				|  |  | +
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				|  |  | +// thunder download
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				|  |  | +type thunderTask struct {
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				|  |  | +	Url      string
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				|  |  | +	SaveFile string
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				|  |  | +	sync.WaitGroup
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				|  |  | +	err error
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				|  |  | +}
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				|  |  | +
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				|  |  | +func (this *thunderTask) Fetch() {
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				|  |  | +	this.err = this.fetch()
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				|  |  | +	this.Done()
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				|  |  | +}
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				|  |  | +
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				|  |  | +var client = &http.Client{}
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				|  |  | +
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				|  |  | +func (this *thunderTask) fetch() error {
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				|  |  | +	//log.Println("thunder, fetch", this.Url)
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				|  |  | +	req, _ := http.NewRequest("GET", this.Url, nil)
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				|  |  | +	req.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8")
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				|  |  | +	req.Header.Set("Accept-Encoding", "gzip,deflate,sdch")
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				|  |  | +	req.Header.Set("Accept-Language", "zh-CN,zh;q=0.8")
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				|  |  | +	req.Header.Set("Cache-Control", "no-cache")
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				|  |  | +	req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36")
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				|  |  | +	resp, err := client.Do(req)
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				|  |  | +	if err != nil {
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				|  |  | +		return err
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				|  |  | +	}
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				|  |  | +	defer resp.Body.Close()
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				|  |  | +	if resp.StatusCode != 200 {
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				|  |  | +		return fmt.Errorf("status code: %d", resp.StatusCode)
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				|  |  | +	}
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				|  |  | +
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				|  |  | +	/*
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				|  |  | +		log.Println("headers:", resp.Header)
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				|  |  | +		switch resp.Header.Get("Content-Type") {
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				|  |  | +		case "image/jpeg":
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				|  |  | +			this.SaveFile += ".jpeg"
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				|  |  | +		case "image/png":
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				|  |  | +			this.SaveFile += ".png"
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				|  |  | +		}
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				|  |  | +	*/
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				|  |  | +	/*
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				|  |  | +		imgType := resp.Header.Get("Content-Type")
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				|  |  | +		if imgType != "image/jpeg" && imgType != "image/png" {
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				|  |  | +			return errors.New("not png or jpeg")
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				|  |  | +		}
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				|  |  | +	*/
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				|  |  | +
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				|  |  | +	tmpFile := this.SaveFile + ".part" // mv to destination when finished
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				|  |  | +	fd, err := os.Create(tmpFile)
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				|  |  | +	if err != nil {
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				|  |  | +		return err
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				|  |  | +	}
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				|  |  | +	_, err = io.Copy(fd, resp.Body)
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				|  |  | +	fd.Close()
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				|  |  | +	if err != nil {
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				|  |  | +		os.Remove(tmpFile)
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				|  |  | +		return err
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				|  |  | +	}
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				|  |  | +	return os.Rename(tmpFile, this.SaveFile)
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				|  |  | +}
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