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package main
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"strconv"
"image"
"image/jpeg"
_ "image/png"
"mime/multipart"
"net/http"
"strings"
"github.com/google/uuid"
"github.com/gorilla/mux"
"github.com/minio/minio-go/v7"
"github.com/minio/minio-go/v7/pkg/credentials"
"github.com/nfnt/resize"
)
func newMinioClient() (*minio.Client, error) {
endpoint := config.S3Endpoint
accessKeyID := config.S3AccessKey
secretKeyID := config.S3SecretKey
useSSL := true
//Initialize Minio
minioCLient, err := minio.New(endpoint, &minio.Options{
Creds: credentials.NewStaticV4(accessKeyID, secretKeyID, ""),
Secure: useSSL,
Region: config.S3Region,
})
if err != nil {
return nil, err
}
return minioCLient, nil
}
//Upload image through guichet server.
func uploadProfilePicture(w http.ResponseWriter, r *http.Request, login *LoginStatus) (string, error) {
file, _, err := r.FormFile("image")
if err == http.ErrMissingFile {
return "", nil
}
if err != nil {
return "", err
}
defer file.Close()
err = checkImage(file)
if err != nil {
return "", err
}
buffFull := bytes.NewBuffer([]byte{})
buffThumb := bytes.NewBuffer([]byte{})
err = resizePicture(file, buffFull, buffThumb)
if err != nil {
return "", err
}
mc, err := newMinioClient()
if err != nil || mc == nil {
return "", err
}
// If a previous profile picture existed, delete it
// (don't care about errors)
if nameConsul := login.UserEntry.GetAttributeValue(FIELD_NAME_PROFILE_PICTURE); nameConsul != "" {
mc.RemoveObject(context.Background(), config.S3Bucket, nameConsul, minio.RemoveObjectOptions{})
mc.RemoveObject(context.Background(), config.S3Bucket, nameConsul+"-thumb", minio.RemoveObjectOptions{})
}
// Generate new random name for picture
nameFull := uuid.New().String()
nameThumb := nameFull + "-thumb"
_, err = mc.PutObject(context.Background(), config.S3Bucket, nameThumb, buffThumb, int64(buffThumb.Len()), minio.PutObjectOptions{
ContentType: "image/jpeg",
})
if err != nil {
return "", err
}
_, err = mc.PutObject(context.Background(), config.S3Bucket, nameFull, buffFull, int64(buffFull.Len()), minio.PutObjectOptions{
ContentType: "image/jpeg",
})
if err != nil {
return "", err
}
return nameFull, nil
}
func checkImage(file multipart.File) error {
buff := make([]byte, 512) //Detect read only the first 512 bytes
_, err := file.Read(buff)
if err != nil {
return err
}
file.Seek(0, 0)
fileType := http.DetectContentType(buff)
fileType = strings.Split(fileType, "/")[0]
if fileType != "image" {
return errors.New("bad type")
}
return nil
}
func resizePicture(file multipart.File, buffFull, buffThumb *bytes.Buffer) error {
file.Seek(0, 0)
picture, _, err := image.Decode(file)
if err != nil {
return err
}
thumbnail := resize.Thumbnail(90, 90, picture, resize.Lanczos3)
picture = resize.Thumbnail(480, 480, picture, resize.Lanczos3)
err = jpeg.Encode(buffFull, picture, &jpeg.Options{
Quality: 95,
})
if err != nil {
return err
}
err = jpeg.Encode(buffThumb, thumbnail, &jpeg.Options{
Quality: 100,
})
return err
}
func handleDownloadPicture(w http.ResponseWriter, r *http.Request) {
name := mux.Vars(r)["name"]
//Check login
login := checkLogin(w, r)
if login == nil {
return
}
//Get the object after connect MC
mc, err := newMinioClient()
if err != nil {
http.Error(w, "MinioClient: "+err.Error(), http.StatusInternalServerError)
return
}
obj, err := mc.GetObject(context.Background(), "bottin-pictures", name, minio.GetObjectOptions{})
if err != nil {
http.Error(w, "MinioClient: GetObject: "+err.Error(), http.StatusInternalServerError)
return
}
defer obj.Close()
objStat, err := obj.Stat()
if err != nil {
http.Error(w, "MiniObjet: "+err.Error(), http.StatusInternalServerError)
return
}
//Send JSON through xhttp
w.Header().Set("Content-Type", objStat.ContentType)
w.Header().Set("Content-Length", strconv.Itoa(int(objStat.Size)))
//Copy obj in w
writting, err := io.Copy(w, obj)
if writting != objStat.Size || err != nil {
http.Error(w, fmt.Sprintf("WriteBody: %s, bytes wrote %d on %d", err.Error(), writting, objStat.Size), http.StatusInternalServerError)
return
}
}
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