SFM-loan-Rest-Api/apiv1.go

package main

import (
	"biukop.com/sfm/loan"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httputil"
	"strings"
	"time"
)

const apiV1Prefix = "/api/v1/"

type apiV1HandlerMap struct {
	Method  string
	Path    string //regex
	Handler func(http.ResponseWriter, *http.Request)
}

type apiV1Envelop struct {
	Version   string
	Success   bool
	Msg       string
	TimeStamp string
}

type apiV1Response struct {
	Env  apiV1Envelop
	Body interface{}
}

var apiV1Handler = []apiV1HandlerMap{
	{"POST", "login", apiV1Login},
	{"GET", "login", apiV1DumpRequest},
}

//apiV1Main  version 1 main entry for all REST API
//
func apiV1Main(w http.ResponseWriter, r *http.Request) {
	logRequestDebug(httputil.DumpRequest(r, true))
	w.Header().Set("Content-Type", "application/json;charset=UTF-8")
	path := r.URL.Path[len(apiV1Prefix):] //strip API prefix

	for _, node := range apiV1Handler {
		if r.Method == node.Method && path == node.Path {
			node.Handler(w, r)
			return
		}
	}
	//Catch for all
	apiV1DumpRequest(w, r)
}

func apiV1Login(w http.ResponseWriter, r *http.Request) {
	p := loan.User{}
	p.FakeNew()

	res := apiV1ResponseBlank()
	res.Body = p
	apiSendJson(res, w)

}

func apiSendJson(p interface{}, w http.ResponseWriter) {
	b, e := json.Marshal(p)
	w.Header().Set("Content-Type", "text/json; charset=utf-8")
	if e == nil {
		fmt.Fprint(w, string(b))
	} else {
		apiV1DumpRequest(w, nil)
	}
}

func apiV1DumpRequest(w http.ResponseWriter, r *http.Request) {
	dump := logRequestDebug(httputil.DumpRequest(r, true))
	dump = strings.TrimSpace(dump)
	msg := fmt.Sprintf("Unhandled Protocol = %s path= %s", r.Method, r.URL.Path)
	dumpLines := strings.Split(dump, "\r\n")
	ar := apiV1ResponseBlank()
	ar.Env.Msg = msg
	ar.Body = dumpLines
	b, _ := json.Marshal(ar)
	fmt.Fprintf(w, "%s\n", b)
}

func apiV1EnvelopBlank() (ret apiV1Envelop) {
	ts := time.Now().Format("2006-01-02 15:04:05")
	ret = apiV1Envelop{
		Version:   loan.Version,
		Success:   true,
		Msg:       "",
		TimeStamp: ts,
	}
	return
}

func apiV1ResponseBlank() (ret apiV1Response) {
	ret.Env = apiV1EnvelopBlank()
	return
}