add json api examples

example/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"bytes"
+	"encoding/json"
 	"html/template"
 	"net/http"
 	"path/filepath"
@@ -23,8 +25,72 @@ func Index(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+type Response struct {
+	Code int
+	Text string
+}
+
+func JSON(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json; charset=utf-8")
+		next.ServeHTTP(w, r)
+	})
+}
+
+func fetch(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	var buffer = new(bytes.Buffer)
+	var response = Response{Code: http.StatusOK, Text: http.StatusText(http.StatusOK)}
+	if err := json.NewEncoder(buffer).Encode(response); err == nil {
+		w.Write(buffer.Bytes())
+	} else {
+		http.Error(w, err.Error(), http.StatusBadGateway)
+	}
+}
+
+func create(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusCreated)
+	var buffer = new(bytes.Buffer)
+	var response = Response{Code: http.StatusCreated, Text: http.StatusText(http.StatusCreated)}
+	if err := json.NewEncoder(buffer).Encode(response); err == nil {
+		w.Write(buffer.Bytes())
+	} else {
+		http.Error(w, err.Error(), http.StatusBadGateway)
+	}
+}
+
+func update(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusAccepted)
+	var buffer = new(bytes.Buffer)
+	var response = Response{Code: http.StatusAccepted, Text: http.StatusText(http.StatusAccepted)}
+	if err := json.NewEncoder(buffer).Encode(response); err == nil {
+		w.Write(buffer.Bytes())
+	} else {
+		http.Error(w, err.Error(), http.StatusBadGateway)
+	}
+}
+
+func remove(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusGone)
+	var buffer = new(bytes.Buffer)
+	var response = Response{Code: http.StatusGone, Text: http.StatusText(http.StatusGone)}
+	if err := json.NewEncoder(buffer).Encode(response); err == nil {
+		w.Write(buffer.Bytes())
+	} else {
+		http.Error(w, err.Error(), http.StatusBadGateway)
+	}
+}
+
 func main() {
 	rex.Use(livereload.Middleware)
 	rex.Get("/", Index)
+
+	apis := rex.Group("/v1/")
+	apis.Use(JSON)
+	apis.Get("/", fetch)
+	apis.Post("/", create)
+	apis.Put("/", update)
+	apis.Delete("/", remove)
+
 	rex.Run()
 }