func (prc *ResizeProcessor) getResampling(params imageserver.Params) (gift.Resampling, error) {
if !params.Has("resampling") {
if prc.DefaultResampling != nil {
return prc.DefaultResampling, nil
}
return gift.NearestNeighborResampling, nil
}
rsp, err := params.GetString("resampling")
if err != nil {
return nil, err
}
switch rsp {
case "nearest_neighbor":
return gift.NearestNeighborResampling, nil
case "box":
return gift.BoxResampling, nil
case "linear":
return gift.LinearResampling, nil
case "cubic":
return gift.CubicResampling, nil
case "lanczos":
return gift.LanczosResampling, nil
}
return nil, &imageserver.ParamError{Param: "resampling", Message: "invalid value"}
}
func (prc *Processor) getInterpolation(params imageserver.Params) (resize.InterpolationFunction, error) {
if !params.Has("interpolation") {
return prc.DefaultInterpolation, nil
}
interpolation, err := params.GetString("interpolation")
if err != nil {
return 0, err
}
switch interpolation {
case "nearest_neighbor":
return resize.NearestNeighbor, nil
case "bilinear":
return resize.Bilinear, nil
case "bicubic":
return resize.Bicubic, nil
case "mitchell_netravali":
return resize.MitchellNetravali, nil
case "lanczos2":
return resize.Lanczos2, nil
case "lanczos3":
return resize.Lanczos3, nil
default:
return 0, &imageserver.ParamError{Param: "interpolation", Message: "invalid value"}
}
}
func (server *Server) buildArgumentsCrop(arguments *list.List, params imageserver.Params) error {
if !params.Has("crop") {
return nil
}
crop, _ := params.GetString("crop")
cropArgs := strings.Split(crop, ",")
cropArgsLen := len(cropArgs)
if cropArgsLen != 2 && cropArgsLen != 4 {
return &imageserver.ParamError{Param: "crop", Message: "Invalid crop request, parameters number mismatch"}
}
if cropArgsLen == 2 {
width, _ := strconv.Atoi(cropArgs[0])
height, _ := strconv.Atoi(cropArgs[1])
arguments.PushBack("-crop")
arguments.PushBack(fmt.Sprintf("%dx%d", width, height))
arguments.PushBack("+repage")
}
if cropArgsLen == 4 {
width, _ := strconv.Atoi(cropArgs[0])
height, _ := strconv.Atoi(cropArgs[1])
x, _ := strconv.Atoi(cropArgs[2])
y, _ := strconv.Atoi(cropArgs[3])
arguments.PushBack("-crop")
arguments.PushBack(fmt.Sprintf("%dx%d+%d+%d", width, height, x, y))
arguments.PushBack("+repage")
}
return nil
}
// Change implements Processor.
func (proc *Processor) Change(params imageserver.Params) bool {
if !params.Has(Param) {
return false
}
params, err := params.GetParams(Param)
if err != nil {
return true
}
if params.Empty() {
return false
}
if params.Has("width") {
return true
}
if params.Has("height") {
return true
}
if params.Has("interpolation") {
return true
}
if params.Has("mode") {
return true
}
return false
}
func TestParseQueryStringUndefined(t *testing.T) {
req, err := http.NewRequest("GET", "http://localhost", nil)
if err != nil {
t.Fatal(err)
}
params := imageserver.Params{}
ParseQueryString("string", req, params)
if params.Has("string") {
t.Fatal("should not be set")
}
}
func getDimension(name string, params imageserver.Params) (int, error) {
if !params.Has(name) {
return 0, nil
}
dimension, err := params.GetInt(name)
if err != nil {
return 0, err
}
if dimension < 0 {
return 0, &imageserver.ParamError{Param: name, Message: "must be greater than or equal to 0"}
}
return dimension, nil
}
// Get implements Server.
func (srv *ValidateParamsServer) Get(params imageserver.Params) (*imageserver.Image, error) {
if params.Has(Param) {
params, err := params.GetParams(Param)
if err != nil {
return nil, err
}
err = srv.validate(params)
if err != nil {
return nil, wrapParamError(err)
}
}
return srv.Server.Get(params)
}
func (prc *RotateProcessor) getBackground(params imageserver.Params) (color.Color, error) {
if !params.Has("background") {
return color.Transparent, nil
}
s, err := params.GetString("background")
if err != nil {
return nil, err
}
c, err := parseHexColor(s)
if err != nil {
return nil, &imageserver.ParamError{Param: "background", Message: err.Error()}
}
return c, nil
}
// Process implements Processor.
func (proc *Processor) Process(nim image.Image, params imageserver.Params) (image.Image, error) {
if !params.Has(Param) {
return nim, nil
}
params, err := params.GetParams(Param)
if err != nil {
return nil, err
}
nim, err = process(nim, params)
if err != nil {
return nil, wrapParamError(err)
}
return nim, nil
}
// Parse implements Parser.
func (parser *FormatParser) Parse(req *http.Request, params imageserver.Params) error {
ParseQueryString("format", req, params)
if !params.Has("format") {
return nil
}
format, err := params.GetString("format")
if err != nil {
return err
}
if format == "jpg" {
format = "jpeg"
}
params.Set("format", format)
return nil
}
func TestFormatParserParseUndefined(t *testing.T) {
parser := &FormatParser{}
req, err := http.NewRequest("GET", "http://localhost", nil)
if err != nil {
t.Fatal(err)
}
params := imageserver.Params{}
err = parser.Parse(req, params)
if err != nil {
t.Fatal(err)
}
if params.Has("format") {
t.Fatal("should not be set")
}
}
func parseSourceTransform(ps Parser, req *http.Request, params imageserver.Params, f func(string) string) error {
err := ps.Parse(req, params)
if err != nil {
return err
}
if !params.Has(imageserver.SourceParam) {
return nil
}
source, err := params.GetString(imageserver.SourceParam)
if err != nil {
return err
}
source = f(source)
params.Set(imageserver.SourceParam, source)
return nil
}
func (hdr *FallbackHandler) getHandler(im *imageserver.Image, params imageserver.Params) (imageserver.Handler, error) {
if im.Format != "gif" {
return hdr.Fallback, nil
}
if !params.Has("format") {
return hdr.Handler, nil
}
format, err := params.GetString("format")
if err != nil {
return nil, err
}
if format != "gif" {
return hdr.Fallback, nil
}
return hdr.Handler, nil
}
func (prc *RotateProcessor) getRotation(params imageserver.Params) (float32, error) {
if !params.Has("rotation") {
return 0, nil
}
rot, err := params.GetFloat("rotation")
if err != nil {
return 0, err
}
if rot < 0 {
rot = math.Mod(rot, 360) + 360
}
if rot >= 360 {
rot = math.Mod(rot, 360)
}
return float32(rot), nil
}
func getDimension(name string, max int, params imageserver.Params) (uint, error) {
if !params.Has(name) {
return 0, nil
}
d, err := params.GetInt(name)
if err != nil {
return 0, err
}
if d < 0 {
return 0, &imageserver.ParamError{Param: name, Message: "must be greater than or equal to 0"}
}
if max > 0 && d > max {
return 0, &imageserver.ParamError{Param: name, Message: fmt.Sprintf("must be less than or equal to %d", max)}
}
return uint(d), nil
}
// Change implements imageserver/image.Processor.
func (prc *RotateProcessor) Change(params imageserver.Params) bool {
if !params.Has(rotateParam) {
return false
}
params, err := params.GetParams(rotateParam)
if err != nil {
return true
}
if params.Empty() {
return false
}
if params.Has("rotation") {
return true
}
return false
}
func (server *Server) buildArgumentsExtent(arguments *list.List, params imageserver.Params, width int, height int) error {
if width == 0 || height == 0 {
return nil
}
if !params.Has("extent") {
return nil
}
extent, err := params.GetBool("extent")
if err != nil {
return err
}
if extent {
arguments.PushBack("-extent")
arguments.PushBack(fmt.Sprintf("%dx%d", width, height))
}
return nil
}
func TestListParserParse(t *testing.T) {
parser := ListParser{
&SourceParser{},
}
req, err := http.NewRequest("GET", "http://localhost?source=foo", nil)
if err != nil {
t.Fatal(err)
}
params := imageserver.Params{}
err = parser.Parse(req, params)
if err != nil {
t.Fatal(err)
}
if !params.Has(imageserver.SourceParam) {
t.Fatal("not set")
}
}
func TestSourceTransformParserUndefined(t *testing.T) {
req, err := http.NewRequest("GET", "http://localhost", nil)
if err != nil {
t.Fatal(err)
}
ps := &SourceTransformParser{
Parser: &SourceParser{},
}
params := imageserver.Params{}
err = ps.Parse(req, params)
if err != nil {
t.Fatal(err)
}
if params.Has(imageserver.SourceParam) {
t.Fatal("should not be set")
}
}
func getModeFunc(params imageserver.Params) (modeFunc, error) {
if !params.Has("mode") {
return resize.Resize, nil
}
mode, err := params.GetString("mode")
if err != nil {
return nil, err
}
switch mode {
case "resize":
return resize.Resize, nil
case "thumbnail":
return resize.Thumbnail, nil
default:
return nil, &imageserver.ParamError{Param: "mode", Message: "invalid value"}
}
}
// Process implements imageserver/image.Processor.
func (prc *Processor) Process(im image.Image, params imageserver.Params) (image.Image, error) {
if !params.Has(param) {
return im, nil
}
params, err := params.GetParams(param)
if err != nil {
return nil, err
}
im, err = prc.process(im, params)
if err != nil {
if err, ok := err.(*imageserver.ParamError); ok {
err.Param = param + "." + err.Param
}
return nil, err
}
return im, nil
}
func (prc *RotateProcessor) getInterpolation(params imageserver.Params) (gift.Interpolation, error) {
if !params.Has("interpolation") {
return prc.DefaultInterpolation, nil
}
interp, err := params.GetString("interpolation")
if err != nil {
return 0, err
}
switch interp {
case "nearest_neighbor":
return gift.NearestNeighborInterpolation, nil
case "linear":
return gift.LinearInterpolation, nil
case "cubic":
return gift.CubicInterpolation, nil
}
return 0, &imageserver.ParamError{Param: "interpolation", Message: "invalid value"}
}
func (enc *Encoder) getQuality(params imageserver.Params) (int, error) {
if !params.Has("quality") {
if enc.DefaultQuality != 0 {
return enc.DefaultQuality, nil
}
return jpeg.DefaultQuality, nil
}
quality, err := params.GetInt("quality")
if err != nil {
return 0, err
}
if quality < 1 {
return 0, &imageserver.ParamError{Param: "quality", Message: "must be greater than or equal to 1"}
}
if quality > 100 {
return 0, &imageserver.ParamError{Param: "quality", Message: "must be less than or equal to 100"}
}
return quality, nil
}
func (prc *ResizeProcessor) getFilter(width, height int, params imageserver.Params) (gift.Filter, error) {
rsp, err := prc.getResampling(params)
if err != nil {
return nil, err
}
if !params.Has("mode") || width == 0 || height == 0 {
return gift.Resize(width, height, rsp), nil
}
mode, err := params.GetString("mode")
if err != nil {
return nil, err
}
switch mode {
case "fit":
return gift.ResizeToFit(width, height, rsp), nil
case "fill":
return gift.ResizeToFill(width, height, rsp, gift.CenterAnchor), nil
}
return nil, &imageserver.ParamError{Param: "mode", Message: "invalid value"}
}
// Process implements Processor.
func (prc *Processor) Process(nim image.Image, params imageserver.Params) (image.Image, error) {
if !params.Has(Param) {
return nim, nil
}
params, err := params.GetParams(Param)
if err != nil {
return nil, err
}
if params.Empty() {
return nim, nil
}
nim, err = prc.process(nim, params)
if err != nil {
if err, ok := err.(*imageserver.ParamError); ok {
err.Param = fmt.Sprintf("%s.%s", Param, err.Param)
}
return nil, err
}
return nim, nil
}
// Handle implements imageserver.Handler.
func (hdr *Handler) Handle(im *imageserver.Image, params imageserver.Params) (*imageserver.Image, error) {
if !params.Has(param) {
return im, nil
}
params, err := params.GetParams(param)
if err != nil {
return nil, err
}
if params.Empty() {
return im, nil
}
im, err = hdr.handle(im, params)
if err != nil {
if err, ok := err.(*imageserver.ParamError); ok {
err.Param = param + "." + err.Param
}
return nil, err
}
return im, nil
}
func (hdr *Handler) buildArgumentsQuality(arguments *list.List, params imageserver.Params, format string) error {
if !params.Has("quality") {
return nil
}
quality, err := params.GetInt("quality")
if err != nil {
return err
}
if quality < 0 {
return &imageserver.ParamError{Param: "quality", Message: "must be greater than or equal to 0"}
}
if format == "jpeg" {
if quality < 0 || quality > 100 {
return &imageserver.ParamError{Param: "quality", Message: "must be between 0 and 100"}
}
}
arguments.PushBack("-quality")
arguments.PushBack(strconv.Itoa(quality))
return nil
}
func getEncoderFormat(defaultFormat string, params imageserver.Params) (Encoder, string, error) {
fromParams := false
format := defaultFormat
if params.Has("format") || defaultFormat == "" {
fromParams = true
var err error
format, err = params.GetString("format")
if err != nil {
return nil, "", err
}
}
enc, err := getEncoder(format)
if err != nil {
if fromParams {
err = &imageserver.ParamError{Param: "format", Message: err.Error()}
}
return nil, "", err
}
return enc, format, nil
}
func (hdr *Handler) buildArgumentsBackground(arguments *list.List, params imageserver.Params) error {
if !params.Has("background") {
return nil
}
background, err := params.GetString("background")
if err != nil {
return err
}
switch len(background) {
case 3, 4, 6, 8:
default:
return &imageserver.ParamError{Param: "background", Message: "length must be equal to 3, 4, 6 or 8"}
}
for _, r := range background {
if (r < '0' || r > '9') && (r < 'a' || r > 'f') {
return &imageserver.ParamError{Param: "background", Message: "must only contain characters in 0-9a-f"}
}
}
arguments.PushBack("-background")
arguments.PushBack(fmt.Sprintf("#%s", background))
return nil
}
func (hdr *Handler) buildArgumentsFormat(arguments *list.List, params imageserver.Params, sourceImage *imageserver.Image) (format string, formatSpecified bool, err error) {
if !params.Has("format") {
return sourceImage.Format, false, nil
}
format, err = params.GetString("format")
if err != nil {
return "", false, err
}
if hdr.AllowedFormats != nil {
ok := false
for _, f := range hdr.AllowedFormats {
if f == format {
ok = true
break
}
}
if !ok {
return "", false, &imageserver.ParamError{Param: "format", Message: "not allowed"}
}
}
arguments.PushBack("-format")
arguments.PushBack(format)
return format, true, nil
}