func (d *gcsDriver) Create(id string) (driver.WFile, error) {
f, _, err := file.Create(d.c, d.path(id), nil)
if err != nil {
return nil, err
}
return wfile{f}, nil
}
// アップロードされた画像をGCSに保存します。
func Store(c appengine.Context, data []byte, filename, mimeType, bucketName string) (absFilename string, err error) {
if len(bucketName) == 0 {
bucketName, err = file.DefaultBucketName(c)
}
if err != nil {
c.Errorf("gcs.go:13")
return "", err
}
opts := &file.CreateOptions{
MIMEType: mimeType,
BucketName: bucketName,
}
wc, absFilename, err := file.Create(c, filename, opts)
if err != nil {
c.Errorf("gcs.go:23")
return "", err
}
defer wc.Close()
_, err = wc.Write(data)
if err != nil {
c.Errorf("gcs.go:30")
return "", err
}
return absFilename, nil
}
// ---------------------------------------------------------------------------
// GET /meme/[id]/[top-text]/[bottom-text]
//
func MemeHandler(w http.ResponseWriter, r *http.Request) {
ctx := appengine.NewContext(r)
var id string
var topText string
var botText string
u, _ := url.Parse(r.RequestURI)
path := u.Path[1:]
if strings.LastIndex(path, ".jpg") == len(path)-4 {
path = path[:len(path)-4]
}
parts := strings.Split(path, "/")
if len(parts) > 1 {
id = parts[1]
if len(parts) > 2 {
topText = parts[2]
if len(parts) > 3 {
botText = parts[3]
}
}
}
topText = strings.Replace(topText, "_", " ", -1)
botText = strings.Replace(botText, "_", " ", -1)
filename := cacheFilename(id, topText, botText)
_, err := file.Stat(ctx, gcsFilesApiPath(bucket, filename))
if err != nil {
fileWriter, _, err := file.Create(ctx, filename, &file.CreateOptions{
MIMEType: "image/jpeg",
BucketName: bucket,
})
defer fileWriter.Close()
err = renderMeme(ctx, fileWriter, id, topText, botText)
if err != nil {
w.WriteHeader(http.StatusNotFound)
w.Write([]byte(err.Error()))
return
}
}
location := gcsDirectPublicUrl(ctx, bucket, filename)
w.Header().Set("Content-Type", "image/jpeg")
w.Header().Set("Location", location)
w.WriteHeader(http.StatusTemporaryRedirect)
}
// ---------------------------------------------------------------------------
// POST /upload
//
// TODO: disallow overwriting existing templates?
//
func UploadHandler(w http.ResponseWriter, r *http.Request) {
ctx := appengine.NewContext(r)
if r.Method != "POST" {
w.WriteHeader(http.StatusBadRequest)
return
}
err := r.ParseMultipartForm(10 * 1024 * 1024)
if err != nil {
ctx.Errorf(err.Error())
return
}
// TODO: validate.
id := r.MultipartForm.Value["key"][0]
fileHeader := r.MultipartForm.File["file"][0]
contentType := fileHeader.Header["Content-Type"][0]
mfile, err := fileHeader.Open()
if err != nil {
ctx.Errorf("Error opening uploaded file: %s", err.Error())
w.WriteHeader(http.StatusBadRequest)
return
}
var img image.Image
switch contentType {
case "image/png":
img, err = png.Decode(mfile)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Unable to decode PNG"))
return
}
case "image/jpeg":
img, err = jpeg.Decode(mfile)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Unable to decode JPEG"))
return
}
default:
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte(fmt.Sprintf("Unknown content-type '%s'", contentType)))
return
}
// Resize such that no edge is larger than maxSize.
size := img.Bounds().Size()
if size.X > size.Y {
if size.X > maxSize {
size.Y *= maxSize / size.X
size.X = maxSize
}
} else {
if size.Y > maxSize {
size.X *= maxSize / size.Y
size.Y = maxSize
}
}
img = resize.Resize(uint(size.X), uint(size.Y), img, resize.NearestNeighbor)
// Create the GCS file and JPEG encode into it.
filename := templateFile(id)
fileWriter, _, err := file.Create(ctx, filename, &file.CreateOptions{
MIMEType: "image/jpeg",
BucketName: bucket,
})
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
ctx.Errorf("Error creating %s: %s", filename, err)
return
}
err = jpeg.Encode(fileWriter, img, &jpeg.Options{Quality: 75})
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fileWriter.Close()
return
}
fileWriter.Close()
// Datastore entry.
key := datastore.NewKey(ctx, TemplateKind, id, 0, nil)
_, err = datastore.Put(ctx, key, &Template{Id: id, Votes: 0})
if err != nil {
ctx.Errorf("Error writing template entity: %s", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
// Respond by showing the uploaded file.
respondWithTemplate(ctx, w, id)
}