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renderer.go
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renderer.go
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package renderer
import (
"github.com/sogko/slumber/domain"
"github.com/unrolled/render"
"net/http"
)
const RendererKey domain.ContextKey = "slumber-mddlwr-unrolled-render-key"
const JSON = "json"
const XML = "xml"
const Data = "octet-stream"
const Text = "text"
type Options render.Options
// Renderer type
// implements IRenderer and IContextMiddleware
type Renderer struct {
r *render.Render
options *Options
DefaultRenderType string
}
// New( Returns a new Renderer object
func New(options *Options, defaultRenderType string) *Renderer {
r := render.New(render.Options(*options))
return &Renderer{r, options, defaultRenderType}
}
// HandlerWithNext Returns a middleware HandlerFunc that saves the Render object into request context
func (renderer *Renderer) Handler(w http.ResponseWriter, req *http.Request, next http.HandlerFunc, ctx domain.IContext) {
SetRendererCtx(ctx, req, renderer)
next(w, req)
}
func (renderer *Renderer) Render(w http.ResponseWriter, req *http.Request, status int, v interface{}) {
acceptHeaders := domain.NewAcceptHeadersFromString(req.Header.Get("accept"))
renderType := renderer.DefaultRenderType
for _, h := range acceptHeaders {
m := h.MediaType
if m.SubType == JSON || m.Suffix == JSON {
renderType = JSON
break
}
if m.SubType == XML || m.Suffix == XML {
renderType = XML
break
}
if m.SubType == Data || m.Suffix == Data {
renderType = Data
break
}
if m.SubType == Text || m.Suffix == Text {
renderType = Text
break
}
}
switch renderType {
case JSON:
renderer.JSON(w, status, v)
case XML:
renderer.XML(w, status, v)
case Data:
renderer.Data(w, status, v.([]byte))
case Text:
renderer.Text(w, status, v.([]byte))
default:
renderer.Text(w, status, v.([]byte))
}
}
func (renderer *Renderer) JSON(w http.ResponseWriter, status int, v interface{}) {
renderer.r.JSON(w, status, v)
}
func (renderer *Renderer) XML(w http.ResponseWriter, status int, v interface{}) {
renderer.r.XML(w, status, v)
}
func (renderer *Renderer) Data(w http.ResponseWriter, status int, v []byte) {
renderer.r.Data(w, status, v)
}
func (renderer *Renderer) Text(w http.ResponseWriter, status int, v []byte) {
w.WriteHeader(status)
w.Write(v)
}
func SetRendererCtx(ctx domain.IContext, r *http.Request, renderer *Renderer) {
ctx.Set(r, RendererKey, renderer)
}
func GetRendererCtx(ctx domain.IContext, r *http.Request) *Renderer {
if ren := ctx.Get(r, RendererKey); ren != nil {
return ren.(*Renderer)
}
return nil
}