Golang traffic.ResponseWriter類代碼示例

func RequireValidImageParameters(w traffic.ResponseWriter, r *traffic.Request) {

	width, err := strconv.Atoi(r.Param("width"))
	if err != nil {
		w.WriteHeader(http.StatusNotFound)
		return
	}

	height, err := strconv.Atoi(r.Param("height"))
	if err != nil {
		height = width
	}

	if (width <= 2560 && width > 0) && (height <= 2560 && height > 0) {

		w.SetVar("width", width)
		w.SetVar("height", height)

		// log latest greatest creation
		if err := ioutil.WriteFile(filepath.Join(cache_folder, "/latest"), []byte(fmt.Sprintf("%d/%d", width, height)), 0644); err != nil {
			// panic is trapped by Traffic and show us a nice stack trace in the browser
			// a proper error handling should be provided, but in this simple example
			// it's used to remind you to always check for errors
			panic(err)
		}

	} else {
		// bad request
		w.WriteHeader(http.StatusBadRequest)
		w.Render("400")
	}

}

func GenerateImageCache(w traffic.ResponseWriter, r *traffic.Request) {

	if !exists(cache_folder) {
		if err := os.Mkdir(cache_folder, 0644); err != nil {
			panic(err)
		}
	}

	filename := fmt.Sprintf("%s/%dx%d.jpg", cache_folder, w.GetVar("width"), w.GetVar("height"))
	w.SetVar("filename", filename)

	if !exists(filename) {
		// file does not exists, generate a cached version
		width := w.GetVar("width").(int)
		height := w.GetVar("height").(int)

		src_image := loadImageFromFile(image_file)
		pattern := resizeImage(src_image, width, height)

		var dst_image image.Image
		if width > height {
			dst_image = tileImageHorizontally(pattern, width, height)
		} else {
			dst_image = tileImageVertically(pattern, width, height)
		}

		saveImageToFile(filename, dst_image)
	}
}

func CheckReleaseFilter(w traffic.ResponseWriter, r *traffic.Request) {
	artistId := r.URL.Query().Get("artist_id")
	releaseId := r.URL.Query().Get("release_id")

	if releaseId == "" {
		return
	}

	if !models.IsValidUUID(releaseId) {
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	if artistId != "" {
		if !models.IsValidUUID(artistId) {
			w.WriteHeader(http.StatusBadRequest)
			return
		}

		if artist.HasRelease(artistId, releaseId) {
			return
		}

		ReleaseNotFoundHandler(w, r)
		return
	}

	if !release.Exists(releaseId) {
		ReleaseNotFoundHandler(w, r)
		return
	}
}

func rootHandler(w traffic.ResponseWriter, r *traffic.Request) {
	response := map[string]string{
		"version": VERSION,
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(response)
}

func RootHandler(w traffic.ResponseWriter, r *traffic.Request) {
	last_image_generated, err := ioutil.ReadFile("cache/latest")

	if err != nil {
		responseData := &ResponseData{string(last_image_generated)}
		w.Render("index", responseData)
	}
}

func pageHandler(w traffic.ResponseWriter, r *traffic.Request) {
	pagePath := r.Param("page_path")

	responseData := &ResponseData{
		PagePath: pagePath,
	}

	w.Render("index", responseData)
}

func CheckForDdosString(w traffic.ResponseWriter, r *traffic.Request) {
	for k, _ := range uriFragments {
		fmt.Printf("Searching for %s in %s", k, r.RequestURI)
		if strings.Contains(r.RequestURI, k) {
			fmt.Printf("Found %s", k)
			w.WriteHeader(http.StatusGatewayTimeout)
			w.WriteText("connection timed out")
		}
	}
}

func rootHandler(w traffic.ResponseWriter, r *traffic.Request) {
	logger := w.GetVar("chromelogger").(*chromelogger.Logger)

	logger.Log("Hello")
	logger.Log(map[string]string{
		"foo": "bar",
	})

	w.WriteText("Hello, check your Chrome console after activating the Chrome Logger extension.\n")
}

func xmlTestHandler(w traffic.ResponseWriter, r *traffic.Request) {
	type Person struct {
		FirstName string `xml:"name>first"`
		LastName  string `xml:"name>last"`
	}

	w.WriteXML(&Person{
		FirstName: "foo",
		LastName:  "bar",
	})
}

func codesHandler(w traffic.ResponseWriter, r *traffic.Request) {
	code := r.Param("code")
	url := fmt.Sprintf("%s%s", baseUrl, code)

	grid, err := qrencode.Encode(url, qrencode.ECLevelQ)
	if err != nil {
		panic(err)
	}

	w.Header().Set("Content-Type", "image/png")
	png.Encode(w, grid.Image(8))
}

func (api *ImgServerApi) deleteHandler(w traffic.ResponseWriter, r *traffic.Request) {

	filename := r.URL.Query().Get("image")
	err := api.imageDir.DeleteFile(filename)
	api.imageCache.Remove(api.imageCache.FindKeys(filename))

	if err != nil {
		traffic.Logger().Print(err.Error())
		w.WriteHeader(http.StatusNotFound)
	} else {
		w.WriteHeader(http.StatusOK)
	}
}

// If the request path is "/ping", it writes PONG in the response and returns without calling the next middleware
// Otherwise it sets the variable "PING" with PONG as value and calls the next  middleware.
// The next middleware and the final handler can get that variable with:
//   w.GetVar("ping")
func (c *PingMiddleware) ServeHTTP(w traffic.ResponseWriter, r *traffic.Request, next traffic.NextMiddlewareFunc) {
	if r.URL.Path == "/ping" {
		w.WriteText("pong\n")

		return
	}

	if nextMiddleware := next(); nextMiddleware != nil {
		w.SetVar("ping", "pong")
		nextMiddleware.ServeHTTP(w, r, next)
	}

	return
}

func rootHandler(w traffic.ResponseWriter, r *traffic.Request) {
	w.WriteText("%s<br />", w.GetVar("foo"))

	// run with TRAFFIC_ENV=production to get the "bar" value
	// from the production section of the config file
	w.WriteText("%s<br />", w.GetVar("bar"))
}

func ArtistHandler(w traffic.ResponseWriter, r *traffic.Request) {
	id := r.URL.Query().Get("id")
	Artist, err := artist.ById(id)

	if err == nil {
		json.NewEncoder(w).Encode(Artist)
	} else if err == sql.ErrNoRows {
		ArtistNotFoundHandler(w, r)
	} else if _, ok := err.(models.InvalidUUID); ok {
		w.WriteHeader(http.StatusBadRequest)
	} else {
		panic(err)
	}
}

func ReleaseGroupsHandler(w traffic.ResponseWriter, r *traffic.Request) {
	artistId := r.URL.Query().Get("artist_id")

	ReleaseGroups, err := releasegroup.AllByArtistId(artistId)

	if err == nil {
		json.NewEncoder(w).Encode(ReleaseGroups)
	} else if err == sql.ErrNoRows {
		w.WriteHeader(http.StatusNotFound)
	} else if _, ok := err.(models.InvalidUUID); ok {
		w.WriteHeader(http.StatusBadRequest)
	} else {
		panic(err)
	}
}