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renderers.go
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167 lines (119 loc) · 4.5 KB
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package detour
import (
"encoding/json"
"encoding/xml"
"io"
"net/http"
)
/* ------------------------------------------------------------------------- */
type CompoundRenderer []Renderer
func (this CompoundRenderer) Render(response http.ResponseWriter, request *http.Request) {
for _, renderer := range this {
renderer.Render(response, request)
}
}
/* ------------------------------------------------------------------------- */
func IfElseRenderer(condition bool, True, False Renderer) Renderer {
if condition {
return True
} else {
return False
}
}
/* ------------------------------------------------------------------------- */
func IfRenderer(condition bool, renderer Renderer) Renderer {
return IfElseRenderer(condition, renderer, NopRenderer{})
}
/* ------------------------------------------------------------------------- */
type NopRenderer struct{}
func (this NopRenderer) Render(http.ResponseWriter, *http.Request) {}
/* ------------------------------------------------------------------------- */
type StatusCodeRenderer int
func (this StatusCodeRenderer) Render(response http.ResponseWriter, _ *http.Request) {
response.WriteHeader(int(this))
}
/* ------------------------------------------------------------------------- */
type HeadersRenderer http.Header
func (this HeadersRenderer) Render(response http.ResponseWriter, _ *http.Request) {
copyHeaders(http.Header(this), response.Header())
}
/* ------------------------------------------------------------------------- */
type SetHeaderPairsRenderer []string
func (this SetHeaderPairsRenderer) Render(response http.ResponseWriter, _ *http.Request) {
if len(this)%2 != 0 {
panic("odd length")
}
header := response.Header()
for x := 0; x < len(this); x += 2 {
header.Set(this[x], this[x+1])
}
}
/* ------------------------------------------------------------------------- */
type AddHeaderPairsRenderer []string
func (this AddHeaderPairsRenderer) Render(response http.ResponseWriter, _ *http.Request) {
if len(this)%2 != 0 {
panic("odd length")
}
header := response.Header()
for x := 0; x < len(this); x += 2 {
header.Add(this[x], this[x+1])
}
}
/* ------------------------------------------------------------------------- */
type CookieRenderer http.Cookie
func (this CookieRenderer) Render(response http.ResponseWriter, _ *http.Request) {
cookie := http.Cookie(this)
http.SetCookie(response, &cookie)
}
/* ------------------------------------------------------------------------- */
type RedirectRenderer string
func (this RedirectRenderer) Render(response http.ResponseWriter, request *http.Request) {
http.Redirect(response, request, string(this), response.(*responseBuffer).StatusCode())
}
/* ------------------------------------------------------------------------- */
type BytesBodyRenderer []byte
func (this BytesBodyRenderer) Render(response http.ResponseWriter, _ *http.Request) {
_, _ = response.Write(this)
}
/* ------------------------------------------------------------------------- */
type StringBodyRenderer string
func (this StringBodyRenderer) Render(response http.ResponseWriter, _ *http.Request) {
_, _ = io.WriteString(response, string(this))
}
/* ------------------------------------------------------------------------- */
type ReaderBodyRenderer struct{ io.Reader }
func (this ReaderBodyRenderer) Render(response http.ResponseWriter, _ *http.Request) {
_, _ = io.Copy(response, this.Reader)
}
/* ------------------------------------------------------------------------- */
type XMLBodyRenderer struct{ Content interface{} }
func (this XMLBodyRenderer) Render(response http.ResponseWriter, _ *http.Request) {
_ = xml.NewEncoder(response).Encode(this.Content)
}
/* ------------------------------------------------------------------------- */
type JSONBodyRenderer struct {
Content interface{}
Indent string
JSONp bool
}
func (this JSONBodyRenderer) Render(response http.ResponseWriter, request *http.Request) {
callback := request.URL.Query().Get("callback")
canRenderJSONp := this.JSONp && callback != ""
if canRenderJSONp {
_, _ = io.WriteString(response, callback)
_, _ = io.WriteString(response, "(")
}
_, _ = response.Write(this.renderContent())
if canRenderJSONp {
_, _ = io.WriteString(response, ")")
}
}
func (this JSONBodyRenderer) renderContent() (content []byte) {
if this.Indent != "" {
content, _ = json.MarshalIndent(this.Content, "", this.Indent)
} else {
content, _ = json.Marshal(this.Content)
}
return content
}
/* ------------------------------------------------------------------------- */