started working on the backend

backend/pkg/router/login.go

@@ -0,0 +1,80 @@
+package router
+
+import (
+	"strconv"
+
+	"github.com/gofiber/fiber/v2"
+	"github.com/johannesbuehl/golunteer/backend/pkg/db"
+)
+
+type UserLogin struct {
+	UserID   int    `json:"userID"`
+	Name     string `json:"name"`
+	LoggedIn bool   `json:"loggedIn"`
+}
+
+// handle welcome-messages from clients
+func handleWelcome(c *fiber.Ctx) error {
+	logger.Debug().Msgf("HTTP %s request: %q", c.Method(), c.OriginalURL())
+
+	response := responseMessage{}
+	response.Data = UserLogin{
+		LoggedIn: false,
+	}
+
+	if ok, err := checkUser(c); err != nil {
+		response.Status = fiber.StatusInternalServerError
+
+		logger.Warn().Msgf("can't check user: %v", err)
+	} else if !ok {
+		response.Status = fiber.StatusNoContent
+	} else {
+		if uid, _, err := extractJWT(c); err != nil {
+			response.Status = fiber.StatusBadRequest
+
+			logger.Error().Msgf("can't extract JWT: %v", err)
+		} else {
+			if users, err := db.SelectOld[UserDB]("users", "uid = ? LIMIT 1", strconv.Itoa(uid)); err != nil {
+				response.Status = fiber.StatusInternalServerError
+
+				logger.Error().Msgf("can't get users from database: %v", err)
+			} else {
+				if len(users) != 1 {
+					response.Status = fiber.StatusForbidden
+					response.Message = "unknown user"
+
+					removeSessionCookie(c)
+				} else {
+					user := users[0]
+
+					response.Data = UserLogin{
+						UserID:   user.UserID,
+						Name:     user.Name,
+						LoggedIn: true,
+					}
+				}
+
+				logger.Debug().Msgf("welcomed user with uid = %v", uid)
+			}
+		}
+	}
+
+	return response.send(c)
+}
+
+func handleLogin(c *fiber.Ctx) error {
+	panic("not implemented yet")
+}
+
+// handles logout-requests
+func handleLogout(c *fiber.Ctx) error {
+	logger.Debug().Msgf("HTTP %s request: %q", c.Method(), c.OriginalURL())
+
+	removeSessionCookie(c)
+
+	return responseMessage{
+		Data: UserLogin{
+			LoggedIn: false,
+		},
+	}.send(c)
+}