1 files changed, 119 insertions, 0 deletions
diff --git a/server/admin/handler.go b/server/admin/handler.go
new file mode 100644
index 0000000..5fd1fee
--- /dev/null
+++ b/server/admin/handler.go
@@ -0,0 +1,119 @@
+package admin
+
+import (
+	"encoding/json"
+	"net/http"
+	"os"
+	"time"
+
+	"git.huntm.net/wedding/server/guest"
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type AdminHandler struct {
+	adminStore adminStore
+	guestStore guest.GuestStore
+}
+
+type adminStore interface {
+	Find(admin Admin) (Admin, error)
+}
+
+type appError struct {
+	Error   error
+	Message string
+	Code    int
+}
+
+func NewAdminHandler(adminStore adminStore, guestStore guest.GuestStore) *AdminHandler {
+	return &AdminHandler{adminStore, guestStore}
+}
+
+func (adminHandler *AdminHandler) ServeHTTP(responseWriter http.ResponseWriter, request *http.Request) {
+	switch {
+	case request.Method == http.MethodOptions:
+		responseWriter.WriteHeader(http.StatusOK)
+	case request.Method == http.MethodPost && request.URL.Path == "/admin/login":
+		adminHandler.handleLogIn(responseWriter, request)
+	default:
+		responseWriter.WriteHeader(http.StatusNotFound)
+	}
+}
+
+func (adminHandler *AdminHandler) handleLogIn(responseWriter http.ResponseWriter, request *http.Request) {
+	token, err := adminHandler.logIn(request)
+	if err != nil {
+		http.Error(responseWriter, err.Message, err.Code)
+	} else {
+		responseWriter.Write(token)
+	}
+}
+
+func (adminHandler *AdminHandler) logIn(request *http.Request) ([]byte, *appError) {
+	requestAdmin, err := adminHandler.decodeCredentials(request)
+	if err != nil {
+		return []byte{}, &appError{err, "failed to unmarshal request", http.StatusBadRequest}
+	}
+	_, err = adminHandler.adminStore.Find(requestAdmin)
+	if err != nil {
+		return []byte{}, &appError{err, "admin not found", http.StatusUnauthorized}
+	}
+	expirationTime := adminHandler.setExpirationTime()
+	claims := adminHandler.createClaims(requestAdmin, expirationTime)
+	key, err := adminHandler.readKey()
+	if err != nil {
+		return []byte{}, &appError{err, "failed to read secret key", http.StatusInternalServerError}
+	}
+	token, err := adminHandler.createToken(claims, key)
+	if err != nil {
+		return []byte{}, &appError{err, "failed to create token", http.StatusInternalServerError}
+	}
+	guests, err := adminHandler.guestStore.Get()
+	if err != nil {
+		return []byte{}, &appError{err, "failed to get guests", http.StatusInternalServerError}
+	}
+	jsonBytes, err := adminHandler.marshalResponse(guests, token)
+	if err != nil {
+		return []byte{}, &appError{err, "failed to marshal response", http.StatusInternalServerError}
+	}
+	return jsonBytes, nil
+}
+
+func (adminHandler *AdminHandler) decodeCredentials(request *http.Request) (Admin, error) {
+	var admin Admin
+	err := json.NewDecoder(request.Body).Decode(&admin)
+	defer request.Body.Close()
+	return admin, err
+}
+
+func (adminHandler *AdminHandler) setExpirationTime() time.Time {
+	return time.Now().Add(15 * time.Minute)
+}
+
+func (adminHandler *AdminHandler) createClaims(admin Admin, expirationTime time.Time) *Claims {
+	return &Claims{
+		admin,
+		jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(expirationTime),
+		},
+	}
+}
+
+func (adminHandler *AdminHandler) readKey() ([]byte, error) {
+	// TODO: use properties file
+	return os.ReadFile("C:\\Users\\mhunt\\admin.pem")
+}
+
+func (adminHandler *AdminHandler) createToken(claims *Claims, key []byte) (string, error) {
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString(key)
+}
+
+func (adminHandler *AdminHandler) marshalResponse(guests []guest.Guest, token string) ([]byte, error) {
+	loginResponse := adminHandler.createLoginResponse(guests, token)
+	return json.Marshal(loginResponse)
+}
+
+func (adminHandler *AdminHandler) createLoginResponse(guests []guest.Guest, token string) *LoginResponse {
+	return &LoginResponse{guests, token}
+}