Adds flexible render system

render/render.go

@@ -0,0 +1,69 @@
+package render
+
+import (
+	"encoding/json"
+	"encoding/xml"
+	"fmt"
+	"html/template"
+	"net/http"
+)
+
+type (
+	Render interface {
+		Render(http.ResponseWriter, int, ...interface{}) error
+	}
+
+	// JSON binding
+	jsonRender struct{}
+
+	// XML binding
+	xmlRender struct{}
+
+	// Plain text
+	plainRender struct{}
+
+	// form binding
+	HTMLRender struct {
+		Template *template.Template
+	}
+)
+
+var (
+	JSON  = jsonRender{}
+	XML   = xmlRender{}
+	Plain = plainRender{}
+)
+
+func writeHeader(w http.ResponseWriter, code int, contentType string) {
+	if code >= 0 {
+		w.Header().Set("Content-Type", contentType)
+		w.WriteHeader(code)
+	}
+}
+
+func (_ jsonRender) Render(w http.ResponseWriter, code int, data ...interface{}) error {
+	writeHeader(w, code, "application/xml")
+	encoder := json.NewEncoder(w)
+	return encoder.Encode(data[0])
+}
+
+func (_ xmlRender) Render(w http.ResponseWriter, code int, data ...interface{}) error {
+	writeHeader(w, code, "application/xml")
+	encoder := xml.NewEncoder(w)
+	return encoder.Encode(data[0])
+}
+
+func (html HTMLRender) Render(w http.ResponseWriter, code int, data ...interface{}) error {
+	writeHeader(w, code, "text/html")
+	file := data[0].(string)
+	obj := data[1]
+	return html.Template.ExecuteTemplate(w, file, obj)
+}
+
+func (_ plainRender) Render(w http.ResponseWriter, code int, data ...interface{}) error {
+	writeHeader(w, code, "text/plain")
+	format := data[0].(string)
+	args := data[1].([]interface{})
+	_, err := w.Write([]byte(fmt.Sprintf(format, args)))
+	return err
+}