app.go

package main

import (
	"database/sql"
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"strings"

	"github.com/gorilla/mux"
	_ "github.com/lib/pq"
	"gopkg.in/oauth2.v3/server"
)

type App struct {
	Router      *mux.Router
	DB          *sql.DB
	OauthServer *server.Server
}

func (a *App) Initialize(user, password, dbname string) {
	connectionString :=
		fmt.Sprintf("user=%s password=%s dbname=%s sslmode=disable", user, password, dbname)

	var err error
	a.DB, err = sql.Open("postgres", connectionString)
	if err != nil {
		log.Fatal(err)
	}

	a.Router = mux.NewRouter()
	a.OauthServer = oauth_server()
	a.initializeRoutes()

}
func (a *App) Run(addr string) {
	log.Fatal(http.ListenAndServe(":8000", a.Router))
}

func (a *App) initializeRoutes() {
	a.Router.HandleFunc("/login", a.login).Methods("POST")
	a.Router.HandleFunc("/signup", a.signup).Methods("POST")
	a.Router.HandleFunc("/services/{userid}", a.getServices).Methods("GET")
	a.Router.HandleFunc("/services", a.putService).Methods("POST")
	a.Router.HandleFunc("/services", a.deleteService).Methods("DELETE")
	a.Router.HandleFunc("/authorize", a.oauthAuthorize).Methods("POST")
	a.Router.HandleFunc("/token", a.oauthToken).Methods("GET")

}
func (a *App) oauthAuthorize(w http.ResponseWriter, r *http.Request) {
	err := a.OauthServer.HandleAuthorizeRequest(w, r)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
	}
}
func (a *App) oauthToken(w http.ResponseWriter, r *http.Request) {
	a.OauthServer.HandleTokenRequest(w, r)
}
func (a *App) login(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	var u user
	decoder := json.NewDecoder(r.Body)
	if err := decoder.Decode(&u); err != nil {
		respondWithError(w, http.StatusBadRequest, "Invalid request payload")
		return
	}
	if err := u.login(a.DB); err != nil {
		respondWithError(w, http.StatusInternalServerError, err.Error())
		return
	}
	respondWithJSON(w, http.StatusOK, map[string]string{"error": "ok"})
}
func (a *App) signup(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	var u user
	decoder := json.NewDecoder(r.Body)
	if err := decoder.Decode(&u); err != nil {
		respondWithError(w, http.StatusBadRequest, "Invalid request payload")
		return
	}
	if err := u.signup(a.DB); err != nil {
		respondWithError(w, http.StatusInternalServerError, err.Error())
		return
	}
	respondWithJSON(w, http.StatusOK, map[string]string{"error": "ok"})
}
func (a *App) getServices(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	vars := mux.Vars(r)
	serviceNames, err := getServices(vars["userid"], a.DB)
	if err != nil {
		respondWithError(w, http.StatusInternalServerError, err.Error())
		return
	}
	respondWithJSON(w, http.StatusOK, map[string]string{"services": strings.Join(serviceNames, ","), "error": "ok"})
}
func (a *App) putService(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	var s service
	decoder := json.NewDecoder(r.Body)
	if err := decoder.Decode(&s); err != nil {
		respondWithError(w, http.StatusBadRequest, "Invalid request payload")
		return
	}
	if err := s.createService(a.DB); err != nil {
		respondWithError(w, http.StatusBadRequest, err.Error())
		return
	}
	respondWithJSON(w, http.StatusOK, map[string]string{"error": "ok"})
}
func (a *App) deleteService(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	var s service
	decoder := json.NewDecoder(r.Body)
	if err := decoder.Decode(&s); err != nil {
		respondWithError(w, http.StatusBadRequest, "Invalid request payload")
		return
	}
	if err := s.deleteService(a.DB); err != nil {
		respondWithError(w, http.StatusBadRequest, err.Error())
		return
	}
	respondWithJSON(w, http.StatusOK, map[string]string{"error": "ok"})
}

func respondWithError(w http.ResponseWriter, code int, message string) {
	respondWithJSON(w, code, map[string]string{"error": message})
}
func respondWithJSON(w http.ResponseWriter, code int, payload interface{}) {
	response, _ := json.Marshal(payload)

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(code)
	w.Write(response)
}