Lorem Ipsum

class UsersMiddleware {
	async validateRequiredUserBodyFields(
		req: Request,
		res: Response,
		next: NextFunction
	) {
		if (req.body && req.body.email) {
			next();
		} else {
			res.status(400).send({
				error: `Missing required fields email`,
			});
		}
	}

	async validateSameEmailDoesntExist(
		req: Request,
		res: Response,
		next: NextFunction
	) {
		const user = await userService.getUserByEmail(req.body.email);
		if (user) {
			res.status(400).send({ error: `User email already exists` });
		} else {
			next();
		}
	}

	async validateSameEmailBelongToSameUser(
		req: Request,
		res: Response,
		next: NextFunction
	) {
		const user = await userService.getUserByEmail(req.body.email);
		if (user && user.id === +req.params.userId) {
			next();
		} else {
			res.status(400).send({ error: `Invalid email` });
		}
	}

	validatePatchEmail = async (
		req: Request,
		res: Response,
		next: NextFunction
	) => {
		if (req.body.email) {
			log("Validating email", req.body.email);

			this.validateSameEmailBelongToSameUser(req, res, next);
		} else {
			next();
		}
	};

	async validateUserExists(req: Request, res: Response, next: NextFunction) {
		const user = await userService.readById(req.params.userId);
		if (user) {
			next();
		} else {
			res.status(404).send({
				error: `User ${req.params.userId} not found`,
			});
		}
	}

	async extractUserId(req: Request, res: Response, next: NextFunction) {
		req.body.id = req.params.userId;
		next();
	}
}
export default new UsersMiddleware();