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api.go
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api.go
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package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"strconv"
"github.com/gorilla/mux"
_ "github.com/joho/godotenv/autoload"
)
type APIServer struct {
listenAddr string
store *PostGresDB
}
func NewApiServer(listenAddr string, store *PostGresDB) *APIServer {
return &APIServer{
listenAddr: listenAddr,
store: store,
}
}
type ApiHandler func(http.ResponseWriter, *http.Request) error
type ApiError struct {
Message string `json:"message"`
}
type EmptySuccessResponse struct {
Message string `json:"message"`
}
func makeHTTPHandler(f ApiHandler) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if err := f(w, r); err != nil {
// handle the error
WriteJSON(w, http.StatusBadRequest, ApiError{Message: err.Error()})
}
}
}
func WriteJSON(w http.ResponseWriter, status int, v any) error {
w.Header().Add("Content-Type", "application/json")
w.WriteHeader(status)
return json.NewEncoder(w).Encode(v)
}
func getUserFromHeader(r *http.Request) (*Account, error) {
user := r.Header.Get("x-server-user")
if len(user) == 0 {
return nil, fmt.Errorf("user not found")
}
userInterface := Account{}
err := json.Unmarshal([]byte(user), &userInterface)
if err != nil {
return nil, fmt.Errorf("user not found")
}
return &userInterface, nil
}
func (s *APIServer) Run() error {
router := mux.NewRouter()
router.HandleFunc("/account", makeHTTPHandler(s.handleAccount))
router.HandleFunc("/account/{id}", makeHTTPHandler(s.handleAccountByID))
router.HandleFunc("/transfer", makeHTTPHandler(s.handleTransfer))
router.Use(loggingMiddleware)
router.Use(makeAuthMiddleware(s))
log.Println("Bank API running on port", s.listenAddr)
http.ListenAndServe(s.listenAddr, router)
return nil
}
// * routes to all REST handlers for /account
func (s *APIServer) handleAccount(w http.ResponseWriter, r *http.Request) error {
if r.Method == "GET" {
return s.handleGetAccount(w, r)
}
if r.Method == "POST" {
return s.handleCreateAccount(w, r)
}
return fmt.Errorf("method not allow %s", r.Method)
}
// * routes to all REST handlers for /account/{id}
func (s *APIServer) handleAccountByID(w http.ResponseWriter, r *http.Request) error {
if r.Method == "GET" {
return s.handleGetAccount(w, r)
}
if r.Method == "DELETE" {
return s.handleDeleteAccount(w, r)
}
return fmt.Errorf("method not allow %s", r.Method)
}
// * routes to all REST handlers for /transfer
func (s *APIServer) handleTransfer(w http.ResponseWriter, r *http.Request) error {
if r.Method == "POST" {
return s.handleTransferFunds(w, r)
}
return fmt.Errorf("method not allow %s", r.Method)
}
// * handles GET /account and /account/:id
func (s *APIServer) handleGetAccount(w http.ResponseWriter, r *http.Request) error {
idStr := mux.Vars(r)["id"]
if len(idStr) > 0 {
id, err := getID(r)
// if ID cant cast to an int
if err != nil {
return err
}
account, err := s.store.GetAccountByID(id)
// if Account doesn't exist
if err != nil {
return fmt.Errorf("no account found for ID given: %s", idStr)
}
WriteJSON(w, http.StatusOK, account)
} else {
// user, err := getUserFromHeader(r)
// print_map(user)
accounts, err := s.store.GetAccounts()
if err != nil {
return err
}
return WriteJSON(w, http.StatusOK, accounts)
}
return nil
}
// * handles POST /account
func (s *APIServer) handleCreateAccount(w http.ResponseWriter, r *http.Request) error {
createAccountReq := new(CreateAccountRequest)
if err := json.NewDecoder(r.Body).Decode(createAccountReq); err != nil {
return err
}
defer r.Body.Close()
newAcc := NewAccount(createAccountReq.FirstName, createAccountReq.LastName)
createdAcc, err := s.store.CreateAccount(newAcc)
if err != nil {
return fmt.Errorf("unable to create an account")
}
tokenString, err := createJWT(createdAcc)
log.Println(tokenString)
if err != nil {
return WriteJSON(w, http.StatusInternalServerError, &ApiError{Message: "a server error occured"})
}
return WriteJSON(w, http.StatusOK, createdAcc)
}
// * handles DELETE /account
func (s *APIServer) handleDeleteAccount(w http.ResponseWriter, r *http.Request) error {
id, err := getID(r)
if err != nil {
return err
}
deleteErr := s.store.DeleteAccountByID(id)
if deleteErr != nil {
return fmt.Errorf("unable to delete account with ID %d", id)
}
return WriteJSON(w, http.StatusOK, &EmptySuccessResponse{Message: "Account deleted succesfully"})
}
func (s *APIServer) handleTransferFunds(w http.ResponseWriter, r *http.Request) error {
transfer := &TransferRequest{}
err := json.NewDecoder(r.Body).Decode(transfer)
if err != nil {
return err
}
defer r.Body.Close()
return WriteJSON(w, http.StatusOK, transfer)
}
func getID(r *http.Request) (int, error) {
idStr := mux.Vars(r)["id"]
if len(idStr) == 0 {
return 0, fmt.Errorf("no ID given")
}
id, err := strconv.Atoi(idStr)
// if ID cant cast to an int
if err != nil {
return 0, fmt.Errorf("invalid ID given: %s", idStr)
}
return id, nil
}