Centralized errors and added their translations. Didn't test

messages/en-US/msgs.json

@@ -0,0 +1,52 @@
+{
+    "authentication not found": "Authentication token not found!",
+    "authentication invalid": "Authentication token is invalid",
+    "user duplicate": "Such user already exists!",
+    "user invalid syntax": "Invalid syntax in one of user's parameters!",
+    "user already in group": "User is already in group!",
+    "username taken": "Username is taken!",
+    "username not found": "Such username not found!",
+    "username required": "Username is required!",
+    "password required": "Password is required!",
+    "password invalid": "Wrong password!",
+    "group name taken": "Group name is taken!",
+    "group name not found": "Group with such name not found!",
+    "group id not found": "Group with such ID not found!",
+    "group not an owner": "You are not an owner of this group!",
+    "group not a member": "You are not a member of this group!",
+    "abstract product not found": "Such abstract product is not found!",
+    "hash without file": "Please, supply a hash of an image!",
+    "file without hash": "Please, supply an image!",
+    "abstract product invalid syntax": "Invalid syntax in one of user's parameters!",
+    "barcode not found": "Such barcode not found!",
+    "barcode duplicate": "Such barcode already exists!",
+    "barcode too long": "This barcode is too long!",
+    "barcode invalid syntax": "Invalid syntax in barcode!",
+    "abstract product name not found": "Abstract product with such name not found!",
+    "abstract product name duplicate": "Abstract product with such name already exists!",
+    "abstract product name too long": "Abstract product name is too long!",
+    "abstract product name invalid syntax": "Invalid syntax in abstract product name!",
+    "net weight too long": "Specified net weight is too long!",
+    "net weight invalid syntax": "Invalid syntax in specified net weight!",
+    "image hash too long": "Specified image hash is too long!",
+    "image hash invalid syntax": "Invalid syntax in specified image hash!",
+    "category too long": "Specified category is too long!",
+    "category invalid syntax": "Invalid syntax in specified category!",
+    "category not found": "Such category not found!",
+    "unit too long": "Specified unit is too long!",
+    "unit invalid syntax": "Invalid syntax in specified unit!",
+    "product not found": "Such product not found!",
+    "product invalid syntax": "Invalid syntax in one of product's parameters!",
+    "abstract product id not found": "Specified abstract product id not found!",
+    "abstract product id invalid syntax": "Invalid syntax in abstract product id!",
+    "expiry date too long": "Specified expiry date is too long!",
+    "expiry date invalid syntax": "Invalid syntax in specified expiry date!",
+    "categories not found": "Such category not found!",
+    "categories duplicate": "Such category already exists!",
+    "categories invalid syntax": "Invalid syntax in one of category parameters!",
+    "ok": "Successfull.",
+    "invalid syntax": "Invalid syntax!",
+    "png only": "Only .png files are allowed!",
+    "too long": "Specified value is too long!",
+    "unknown": "Unknown server error. Please, contact the develoeper!"
+}

messages/ru-RU/msgs.json

@@ -0,0 +1,52 @@
+{
+    "authentication not found": "Токен аутентификации не найден!",
+    "authentication invalid": "Токен аутентификации неверен!",
+    "user duplicate": "Такой пользователь уже существует!",
+    "user invalid syntax": "Неправильный синткасис в одном из параметров пользователя!",
+    "user already in group": "Пользователь уже в группе!",
+    "username taken": "Имя пользователя занято!",
+    "username not found": "Такое имя пользователя не найдено!",
+    "username required": "Требуется имя пользователя!",
+    "password required": "Требуется пароль!",
+    "password invalid": "Неверный пароль!",
+    "group name taken": "Такое имя группы уже существует!",
+    "group name not found": "Группы с таким именем не существует!",
+    "group id not found": "Группы с таким ID не существует!",
+    "group not an owner": "Вы не владелец этой группы!",
+    "group not a member": "Вы не участник этой группы!",
+    "abstract product not found": "Такой абстрактный продукт не найден!",
+    "hash without file": "Пожалуйста, укажите хеш изображения!",
+    "file without hash": "Пожалуйста, укажите изображение!",
+    "abstract product invalid syntax": "Неправильный синткасис в одном из параметров абстрактного продукта!",
+    "barcode not found": "Такой штрихкод не найден!",
+    "barcode duplicate": "Такой штрихкод уже существует!",
+    "barcode too long": "Этот штрихкод слишком большой!",
+    "barcode invalid syntax": "Этот штрихкод неверен!",
+    "abstract product name not found": "абстрактного продукта с таким именем не найдено!",
+    "abstract product name duplicate": "абстрактный продукт с таким именем уже существует!",
+    "abstract product name too long": "Имя абстрактного продукта слишком длинное!",
+    "abstract product name invalid syntax": "Неверный синткасис в имени абстрактного продукта!",
+    "net weight too long": "Указанный вес нетто слишком длинный!",
+    "net weight invalid syntax": "Неверный указанный вес нетто!",
+    "image hash too long": "Указанный хеш изображения слишком длинный!",
+    "image hash invalid syntax": "Неверный указанный хеш изображения!",
+    "category too long": "Указанная категория слишком длинная!",
+    "category invalid syntax": "Неверный синткасис в категории!",
+    "category not found": "Такая категория не найдена!!",
+    "unit too long": "Указанная единица измерения слишком длинная!",
+    "unit invalid syntax": "Неправильный синткасис в указанной единице измерения!",
+    "product not found": "Такой продукт не найден!",
+    "product invalid syntax": "Неверный синткасис в одном из параметров продукта!",
+    "abstract product id not found": "Абстрактный продукт с таким ID не найден!",
+    "abstract product id invalid syntax": "Неверный синткасис ID абстрактного продукта!",
+    "expiry date too long": "Указанная дата годен до слишком длинная!",
+    "expiry date invalid syntax": "Неверный синткасис в указанной дате годен до!",
+    "categories not found": "Накая категория не найдена!",
+    "categories duplicate": "Такая категория уже существует!",
+    "categories invalid syntax": "Неверный синткасис одного из параметров категории!",
+    "ok": "Успешно.",
+    "invalid syntax": "Неправильный синткасис!",
+    "png only": "Разрешены только файлы формата .png!",
+    "too long": "Указанное значение слишком длинное!",
+    "unknown": "Неизвестная ошибка сервера! Пожалуйста, сообщите разработчику!"
+}

src/controllers/abstractproduct.js

@@ -1,41 +1,32 @@
 import AbstractProductService from '../services/abstractproduct.js';
-import statuses from '../utils/status.js';
-import log from '../utils/log.js';
 import fs from 'fs';
 import path from 'path';
+import customError from '../response/customError.js';
+import responseCodes from '../response/responseCodes.js';
+import translate from '../utils/translate.js';
 
 const TAG = "/controllers/abstractproduct.js";
 
 class AbstractProductController {
     async create(req, res) {
-        try {
         const { groupId, localId, barcode, name, net_weight, image_filename, category, unit } = req.body;
 
         const tempPath = req.file.path;
         const targetPath = path.join(path.resolve(path.dirname('')), `/uploads/${image_filename}.png`);
 
         if (path.extname(req.file.originalname).toLowerCase() !== ".png") {
-                return res.status(400).send("Only .png files are allowed")
+            fs.rmSync(tempPath);
+            throw new customError(`create abstract product only png allowed`, responseCodes.responses.general.png_only);
         }
 
-            //fs.renameSync(tempPath, targetPath);
         fs.copyFileSync(tempPath, targetPath);
         fs.rmSync(tempPath);
+
         await AbstractProductService.create(groupId, localId, barcode, name, net_weight, image_filename, category, unit);
-            return res.status(200).send("Successfull");
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
-        } catch (e) {
-            switch (e.status) {
-                case statuses.duplicate:
-                    return res.status(400).send(e.message);
-                default:
-                    log.error(e.original);
-                    return res.status(500).send(e.message);
-            }
-        }
     }
 
     async update(req, res) {
-        try {
         let { groupId, localId, barcode, name, net_weight, image_filename, category, unit } = req.body;
 
         const tempPath = req.file.path;
@@ -49,31 +40,21 @@ class AbstractProductController {
         if (net_weight) await AbstractProductService.updateNetWeight(groupId, localId, net_weight);
 
         if (image_filename && tempPath) {
-                //fs.renameSync(tempPath, targetPath);
             fs.copyFileSync(tempPath, targetPath);
             fs.rmSync(tempPath);
             await AbstractProductService.updateImageFilename(groupId, localId, image_filename);
         } else if (image_filename && !tempPath) {
-                return res.status(400).send("You must supply image file along with its hash");
+            throw new customError(`Abstract product update image hash without file`, responseCodes.responses.abstractproducts.hash_without_file);
         } else if (!image_file && tempPath) {
-                return res.status(400).send("You must supply image file hash along with file");
+            fs.rmSync(tempPath);
+            throw new customError(`Abstract product update file without image hash`, responseCodes.responses.abstractproducts.file_without_hash);
         }
 
         if (category) await AbstractProductService.updateCategory(groupId, localId, category);
 
         if (unit) await AbstractProductService.updateUnit(groupId, localId, unit);
 
-            return res.status(200).send("Successfull");
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
-        } catch (e) {
-            switch (e.status) {
-                case statuses.invalid_syntax:
-                    log.error(e.original);
-                    return res.status(400).send(e.message);
-                default:
-                    log.error(e.original);
-                    return res.status(500).send(e.message);
-            }
-        }
     }
 };
 

src/controllers/category.js

@@ -1,25 +1,23 @@
 import CategoryService from "../services/category.js";
-import log from "../utils/log.js";
+import translate from "../utils/translate.js";
+
 const TAG = "controllers/category.js";
 
 class CategoryController {
     async create(req, res) {
-        try {
         const { localId, categoryName, groupId } = req.body;
 
         await CategoryService.create(groupId, localId, categoryName);
-            return res.status(200).send("Success");
 
-        } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/create: ${e}`)); }
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
     }
 
     async update(req, res) {
-        try {
         const { localId, groupId, name } = req.body;
 
         await CategoryService.update(groupId, localId, name);
-            return res.status(200).send("Success");
+
-        } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/update: ${e}`)); }
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
     }
 };
 

src/controllers/group.js

@@ -2,14 +2,13 @@ import GroupService from '../services/group.js';
 import UserService from '../services/user.js';
 import jwt from 'jsonwebtoken';
 import config from '../../config.json' with {type: "json"};
-import statuses from '../utils/status.js';
 import log from '../utils/log.js';
+import translate from '../utils/translate.js';
 
 const TAG = "/controllers/group.js";
 
 class GroupController {
     async create(req, res) {
-        try {
         let { groupName } = req.params;
 
         let user = jwt.decode(req.headers.authorization.split(' ')[1], config.secret);
@@ -18,33 +17,26 @@ class GroupController {
         log.info(`New group with name ${groupName} was just created by user ${user.login.username}`);
 
         UserService.joinGroup(user.login.id, status.id);
-            return res.status(200).send("Successfull");
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
-        } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/create: ${e}`)); }
     }
     async join(req, res) {
-        try {
         let { groupId } = req.params;
 
         let user = jwt.decode(req.headers.authorization.split(' ')[1], config.secret);
-            let status = await UserService.joinGroup(user.login.id, groupId);
+        await UserService.joinGroup(user.login.id, groupId);
-
-            if (status == statuses.duplicate) return res.status(400).send("Already in group");
 
         log.info(`User ${user.login.username} has just joined group with ID ${groupId}`);
-            return res.status(200).send("Successfull");
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
-        } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/join: ${e}`)); }
     }
 
     async updatePassword(req, res) {
-        try {
         let { groupId } = req.params;
         let { password } = req.body;
 
         await GroupService.updatePassword(groupId, password);
         log.info(`Password for group with ID ${groupId} was updated`);
-            return res.status(200).send("Successfull");
 
-        } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/updatePassword ${e}`)); }
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
     }
 }
 

src/controllers/product.js

@@ -1,29 +1,19 @@
 import ProductService from '../services/product.js';
-import statuses from '../utils/status.js';
+import translate from '../utils/translate.js';
-import log from '../utils/log.js';
 
 const TAG = "/controllers/product.js"
 
 class AbstractProductController {
     async create(req, res) {
-        try {
         const { groupId, localId, abstract_product_id, amount, date_of_production, expiry_date } = req.body;
+
         await ProductService.create(groupId, localId, abstract_product_id, amount, date_of_production, expiry_date);
-            return res.status(200).send("Successfull");
+
-        } catch (e) {
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
-            switch (e.status) {
-                case statuses.duplicate:
-                    return res.status(400).send(e.message);
-                default:
-                    log.error(e.original)
-                    return res.status(500).send(e.message)
-            }
-        }
     }
 
 
     async update(req, res) {
-        try {
         let { groupId, localId, abstract_product_id, amount, date_of_production, expiry_date } = req.body;
 
         if (abstract_product_id) await ProductService.updateAbstractProductId(groupId, localId, abstract_product_id);
@@ -33,15 +23,8 @@ class AbstractProductController {
         if (date_of_production) await ProductService.updateDateOfProduction(groupId, localId, date_of_production);
 
         if (expiry_date) await ProductService.updateExpiryDate(groupId, localId, expiry_date);
-        } catch (e) {
-            switch (e.status) {
-                case statuses.invalid_syntax:
-                    log.error(e.original);
-                    return res.status(400).send(e.message);
-            }
-        }
 
-        return res.status(200).send("Successfull");
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
     }
 };
 

src/controllers/user.js

@@ -4,35 +4,31 @@ import bcrypt from 'bcrypt';
 import genToken from '../utils/jwt.js';
 import AbstractProductService from '../services/abstractproduct.js';
 import ProductService from '../services/product.js';
+import translate from '../utils/translate.js';
 
 const TAG = "/controllers/userjs"
 
 class UserController {
     async register(req, res) {
-        try {
         const { username, password } = req.body;
 
         await UserService.create(username, password);
 
         log.info(`New user with name ${username} has just registered`);
-            return res.status(200).send("Successfull register");
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
-        } catch (e) { res.status(500).send(log.unknownError(`${TAG}/register: ${e}`)); }
     }
 
     async login(req, res) {
-        try {
         const { username, password } = req.body;
 
         const user = await UserService.getByUsername(username);
         if (!bcrypt.compareSync(password, user.password)) return res.status(401).send("Wrong password");
 
         const token = genToken(user);
-            return res.status(200).send(token);
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
-        } catch (e) { res.status(500).send(log.unknownError(`${TAG}/login: ${e}`)); }
     }
 
     async synchronize(req, res) {
-        try {
         const { groupId } = req.params;
 
         let result = {};
@@ -40,8 +36,7 @@ class UserController {
         result.products = await ProductService.getAll(groupId);
         result.categories = await CategoryService.getAll(groupId);
 
-            return res.status(200).json(result);
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
-        } catch (e) { res.status(500).send(log.unknownError(`${TAG}/synchronize: ${e}`)); }
     }
 }
 

src/middlewares/auth.js

@@ -3,46 +3,41 @@ import jwt from 'jsonwebtoken';
 import config from '../../config.json' with {type: "json"};
 import GroupService from '../services/group.js';
 import UserService from '../services/user.js';
+import customError from '../response/customError.js';
+import responseCodes from '../response/responseCodes.js';
 
 const TAG = "/middlewares/auth.js";
 
 const requireUsername = async (req, res, next) => {
     if (req.method == "OPTIONS") next();
 
-    try {
     const { username } = req.body;
-        if (!username) return res.status(400).send("Username is required");
+    if (!username) throw new customError(`requireUsername username is required`, responseCodes.responses.usernames.required)
     next();
-    } catch (e) { return res.status(500).send(unknownError(`${TAG}/requireUsername: ${e}`)); }
 };
 
 const requirePassword = async (req, res, next) => {
     if (req.method == "OPTIONS") next();
 
-    try {
     const { password } = req.body;
-        if (!password) return res.status(400).send("Password is required");
+    if (!password) throw new customError(`requirePassword password is required`, responseCodes.responses.passwords.required);
     next();
-    } catch (e) { return res.status(500).send(unknownError(`${TAG}/requirePassword: ${e}`)); }
 };
 
 const authenticate = async (req, res, next) => {
     if (req.method == "OPTIONS") next();
 
-    try {
+    if (!req.headers.authorization) throw new customError(`authenticate no authorization header`, responseCodes.responses.authentication.not_found);
-        if (!req.headers.authorization) return res.status(403).send("No authorization header supplied");
     const token = req.headers.authorization.split(' ')[1];
-        if (!token) return res.status(403).send("No authorization token supplied");
+    if (!token) throw new customError(`authenticate no authorization token in header`, responseCodes.responses.authentication.not_found);
-        if (!jwt.verify(token, config.secret)) return res.status(403).send("Authorization token is incorrect");
+    if (!jwt.verify(token, config.secret)) throw new customError(`authenticate token is invalid`, responseCodes.responses.authentication.invalid);
 
     next();
-    } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/authenticate: ${e}`)); }
 };
 
 const authorizeGroupOwner = async (req, res, next) => {
     if (req.method == "OPTIONS") next();
 
-    try {
     const token = req.headers.authorization.split(' ')[1];
 
     const { groupId } = req.params;
@@ -50,24 +45,21 @@ const authorizeGroupOwner = async (req, res, next) => {
     let user = jwt.decode(token, config.secret);
 
     let adminId = await GroupService.getAdminId(groupId);
-        if (user.login.id != adminId) return res.status(403).send("Not your group");
+    if (user.login.id != adminId) throw new customError(`authorizeGroupOwner not an owner`, responseCodes.responses.groups.not_an_owner)
     next();
-    } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/authorizeGroupOwner: ${e}`)); }
 };
 
 const checkGroupPassword = async (req, res, next) => {
     if (req.method == "OPTIONS") next();
 
-    try {
     const { groupId } = req.params;
     const { password } = req.body;
 
     const groupPassword = await GroupService.getPassword(groupId);
 
-        if (groupPassword != password) return res.status(403).send("Wrong password");
+    if (groupPassword != password) throw new customError(`checkGroupPassword password is invalid`, responseCodes.responses.passwords.invalid);
     next();
 
-    } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/checkGroupPassword: ${e}`)); }
 };
 
 const userIsInGroup = async (req, res, next) => {
@@ -77,7 +69,7 @@ const userIsInGroup = async (req, res, next) => {
 
     const token = req.headers.authorization.split(' ')[1];
     let user = jwt.decode(token, config.secret);
-    if (!await UserService.isInGroup(user.login.id, groupId)) return res.status(403).send("You are not a member of this group");
+    if (!await UserService.isInGroup(user.login.id, groupId)) throw new customError(`userIsInGroup not a member`, responseCodes.responses.groups.not_a_member)
     next();
 };
 

src/middlewares/existance.js

@@ -1,116 +0,0 @@
-import UserService from '../services/user.js';
-import GroupService from '../services/group.js';
-import AbstractProductService from '../services/abstractproduct.js';
-import ProductService from '../services/product.js';
-import CategoryService from '../services/category.js';
-import log from '../utils/log.js';
-import statuses from '../utils/status.js';
-
-const TAG = "/middlewares/existance.js";
-
-const usernameExists = async (req, res, next) => {
-    try {
-        let { username } = req.body;
-
-        let user = await UserService.getByUsername(username);
-        if (!user || user == statuses.not_found) return res.status(404).send("User not found");
-        next();
-    } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/usernameExists: ${e}`)); }
-};
-
-const usernameDoesntExist = async (req, res, next) => {
-    try {
-        let { username } = req.body;
-
-        let user = await UserService.getByUsername(username);
-        if (user != undefined && user != statuses.not_found) return res.status(400).send("Such username already taken");
-        next();
-    } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/usernameDoesntExist: ${e}`)); }
-};
-
-const groupExists = async (req, res, next) => {
-    try {
-        let groupId = req.params.groupId || req.body.groupId;
-
-        let group = await GroupService.getById(groupId);
-
-        if (!group || group == statuses.not_found) return res.status(404).send("Group not found");
-        next();
-    } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/groupExists: ${e}`)) }
-};
-
-const groupDoesntExist = async (req, res, next) => {
-    try {
-        let groupId = req.params.groupId || req.body.groupId;
-
-        let group = await GroupService.getById(groupId);
-
-        if (group || group != statuses.not_found) return res.status(400).send("Such group already exists");
-        next();
-    } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/groupDoesntExist: ${e}`)) }
-};
-
-const groupNameDoesntExist = async (req, res, next) => {
-    try {
-        const { groupName } = req.params;
-
-        let group = await GroupService.getByName(groupName);
-        if (group) return res.status(400).send("Such group name already exists");
-        next();
-    } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/groupNameDoesntExist: ${e}`)); }
-};
-
-const abstractProductExists = async (req, res, next) => {
-    try {
-        const { groupId, localId } = req.body;
-
-        let result = await AbstractProductService.exists(groupId, localId);
-        if (!result) return res.status(404).send("Abstract product not found");
-        next();
-    } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/abstractProductExists: ${e}`)); }
-};
-
-const productExists = async (req, res, next) => {
-    try {
-        const { groupId, localId } = req.body;
-
-        let result = await ProductService.exists(groupId, localId);
-        if (!result) return res.status(404).send("Product not found");
-        next();
-    } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/productExists: ${e}`)); }
-};
-
-const categoryNameDoesntExist = async (req, res, next) => {
-    try {
-        const { categoryName, localId, groupId } = req.body;
-
-        let result = await CategoryService.getByName(groupId, localId, categoryName);
-        if (result != statuses.not_found) return res.status(400).send("Such category name exists");
-        next();
-    } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/categoryNameDoesntExist: ${e}`)); }
-};
-
-const categoryExists = async (req, res, next) => {
-    try {
-        const { localId, groupId } = req.body;
-
-        let result = await CategoryService.getById(groupId, localId);
-        if (!result || result == statuses.not_found) return res.status(404).send("No such category");
-        next();
-    } catch (e) { return res.status(500).send(log.unknownError(`${TAG}/categoryExists: ${e}`)); }
-};
-
-export default {
-    usernameExists,
-    usernameDoesntExist,
-
-    groupExists,
-    groupDoesntExist,
-    groupNameDoesntExist,
-
-    abstractProductExists,
-    productExists,
-
-    categoryNameDoesntExist,
-    categoryExists
-};

src/response/customError.js

@@ -0,0 +1,12 @@
+class customError extends Error {
+    constructor(message, code) {
+        super(message)
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, customError);
+        }
+
+        this.code = code;
+    }
+}
+
+export default customError;

src/response/errorHandler.js

@@ -0,0 +1,26 @@
+import log from "../utils/log";
+import customError from "./customError";
+import responses from './responseCodes';
+import translate from '../utils/translate.js';
+
+const errorHandler = (err, req, res) => {
+    log.error(err);
+
+    let language = req.headers["accept-language"];
+
+    if (err instanceof customError) {
+        return res.status(responses.getHTTPCode(err.code)).send(translate(language, code));
+    }
+}
+
+const tryHandler = (func) => {
+    return async (req, res, next) => {
+        try {
+            await func(req, res, next);
+        } catch (err) {
+            errorHandler(err, req, res);
+        }
+    }
+}
+
+export default tryHandler;

src/response/responseCodes.js

@@ -0,0 +1,218 @@
+import fs from 'fs';
+
+const responses = {
+    authentication: {
+        not_found: "authentication not found",
+        invalid: "authentication invalid"
+    },
+    user: {
+        duplicate: "user duplicate",
+        invalid_syntax: "user invalid syntax",
+        already_in_group: "user already in group"
+    },
+    usernames: {
+        duplicate: "username taken",
+        not_found: "username not found",
+        required: "username required"
+    },
+    passwords: {
+        required: "password required",
+        invalid: "password invalid"
+    },
+    groups: {
+        duplicate: "group name taken",
+        name_not_found: "group name not found",
+        id_not_found: "group id not found",
+        not_an_owner: "group not an owner",
+        not_a_member: "group not a member"
+    },
+    abstractproducts: {
+        not_found: "abstract product not found",
+        hash_without_file: "hash without file",
+        file_without_hash: "file without hash",
+        invalid_syntax: "abstract product invalid syntax"
+    },
+    barcode: {
+        not_found: "barcode not found",
+        duplicate: "barcode duplicate",
+        too_long: "barcode too long",
+        invalid_syntax: "barcode invalid syntax"
+    },
+    abstractproductname: {
+        not_found: "abstract product name not found",
+        duplicate: "abstract product name duplicate",
+        too_long: "abstract product name too long",
+        invalid_syntax: "abstract product name invalid syntax"
+    },
+    netweight: {
+        too_long: "net weight too long",
+        invalid_syntax: "net weight invalid syntax"
+    },
+    imagehash: {
+        too_long: "image hash too long",
+        invalid_syntax: "image hash invalid syntax"
+    },
+    category: {
+        too_long: "category too long",
+        invalid_syntax: "category invalid syntax",
+        not_found: "category not found"
+    },
+    unit: {
+        too_long: "unit too long",
+        invalid_syntax: "unit invalid syntax"
+    },
+    products: {
+        not_found: "product not found",
+        invalid_syntax: "product invalid syntax"
+    },
+    abstractproductid: {
+        not_found: "abstract product id not found",
+        invalid_syntax: "abstract product id invalid syntax"
+    },
+    amount: {
+        too_long: "amount too long",
+        invalid_syntax: "amount invalid syntax"
+    },
+    dateofproduction: {
+        too_long: "date of production too long",
+        invalid_syntax: "date of production invalid syntax"
+    },
+    expirydate: {
+        too_long: "expiry date too long",
+        invalid_syntax: "expiry date invalid syntax"
+    },
+    categories: {
+        duplicate: "categories duplicate",
+        not_found: "categories not found"
+    },
+    general: {
+        ok: "ok",
+        invalid_syntax: "invalid syntax",
+        png_only: "png only",
+        too_long: "too long",
+        unknown: "unknown"
+    }
+}
+
+const getHTTPCode = (type) => {
+    switch (code) {
+        case responses.general.ok:
+            return 200
+        case responses.general.invalid_syntax:
+            return 400
+        case responses.general.unknown:
+            return 500
+        case responses.general.png_only:
+            return 400
+        case responses.general.too_long:
+            return 400
+
+        case responses.authentication.invalid:
+            return 403
+        case responses.authentication.not_found:
+            return 403
+
+        case responses.user.already_in_group:
+            return 409
+        case responses.user.duplicate:
+            return 409
+        case responses.user.invalid_syntax:
+            return 400
+
+
+        case responses.usernames.duplicate:
+            return 409
+        case responses.usernames.not_found:
+            return 404
+        case responses.usernames.required:
+            return 400
+
+        case responses.passwords.required:
+            return 400
+        case responses.passwords.invalid:
+            return 403
+
+        case responses.groups.id_not_found:
+            return 404
+        case responses.groups.name_not_found:
+            return 404
+        case responses.groups.duplicate:
+            return 409
+        case responses.groups.not_an_owner:
+            return 403
+        case responses.groups.not_a_member:
+            return 403
+
+        case responses.abstractproducts.not_found:
+            return 404
+        case responses.abstractproducts.file_without_hash:
+            return 400
+        case responses.abstractproducts.hash_without_file:
+            return 400
+        case responses.abstractproducts.invalid_syntax:
+            return 400
+
+        case responses.abstractproductid.invalid_syntax:
+            return 400
+        case responses.abstractproductid.not_found:
+            return 404
+
+        case responses.abstractproductname.duplicate:
+            return 409
+        case responses.abstractproductname.invalid_syntax:
+            return 400
+        case responses.abstractproductname.not_found:
+            return 404
+        case responses.abstractproductname.too_long:
+            return 400
+
+        case responses.abstractproducts.file_without_hash:
+            return 400
+        case responses.abstractproducts.hash_without_file:
+            return 400
+        case responses.abstractproducts.invalid_syntax:
+            return 400
+        case responses.abstractproducts.not_found:
+            return 404
+
+        case responses.amount.invalid_syntax:
+            return 400
+        case responses.amount.too_long:
+            return 409
+
+        case responses.barcode.duplicate:
+            return 409
+        case responses.barcode.invalid_syntax:
+            return 400
+        case responses.barcode.not_found:
+            return 404
+        case responses.barcode.too_long:
+            return 400
+
+        case responses.categories.duplicate:
+            return 409
+        case responses.categories.not_found:
+            return 404
+
+        case responses.category.invalid_syntax:
+            return 400
+        case responses.category.too_long:
+            return 400
+        case responses.category.not_found:
+            return 404
+
+        case responses.dateofproduction.invalid_syntax:
+            return 400
+        case responses.dateofproduction.too_long:
+            return 400
+
+        case responses.expirydate.invalid_syntax:
+            return 400
+        case responses.expirydate.too_long:
+            return 400
+        default:
+            return 500
+    }
+}
+
+export default { responses, getHTTPCode }

src/routers/abstractproduct.js

@@ -1,9 +1,9 @@
 import { Router } from 'express';
 import auth from '../middlewares/auth.js';
 import AbstractProductController from '../controllers/abstractproduct.js';
-import existance from '../middlewares/existance.js';
 import multer from 'multer';
 import path from 'path';
+import tryHandler from '../response/errorHandler.js';
 
 const upload = multer(({
     dest: path.join(path.resolve(path.dirname('')), "/temp")
@@ -11,7 +11,7 @@ const upload = multer(({
 
 const AbstractProductRouter = new Router();
 
-AbstractProductRouter.post('/create', upload.single("file"), auth.authenticate, existance.groupExists, auth.userIsInGroup, AbstractProductController.create);
+AbstractProductRouter.post('/create', upload.single("file"), tryHandler(auth.authenticate), tryHandler(auth.userIsInGroup), tryHandler(AbstractProductController.create));
-AbstractProductRouter.post('/update', upload.single("file"), auth.authenticate, existance.groupExists, auth.userIsInGroup, existance.abstractProductExists, AbstractProductController.update);
+AbstractProductRouter.post('/update', upload.single("file"), tryHandler(auth.authenticate), tryHandler(auth.userIsInGroup), tryHandler(AbstractProductController.update));
 
 export default AbstractProductRouter;

src/routers/category.js

@@ -1,11 +1,11 @@
 import { Router } from 'express';
 import auth from '../middlewares/auth.js';
-import existance from '../middlewares/existance.js';
 import CategoryController from '../controllers/category.js';
+import tryHandler from '../response/errorHandler.js';
 
 const CategoryRouter = new Router();
 
-CategoryRouter.post('/create', auth.authenticate, existance.groupExists, existance.categoryNameDoesntExist, CategoryController.create);
+CategoryRouter.post('/create', tryHandler(auth.authenticate), tryHandler(CategoryController.create));
-CategoryRouter.post('/update', auth.authenticate, existance.groupExists, existance.categoryExists, CategoryController.update);
+CategoryRouter.post('/update', tryHandler(auth.authenticate), tryHandler(CategoryController.update));
 
 export default CategoryRouter;

src/routers/group.js

@@ -1,12 +1,12 @@
 import { Router } from 'express';
 import auth from '../middlewares/auth.js';
 import GroupController from '../controllers/group.js';
-import existance from '../middlewares/existance.js';
+import tryHandler from '../response/errorHandler.js';
 
 const GroupRouter = new Router();
 
-GroupRouter.post('/create/:groupName', auth.authenticate, existance.groupNameDoesntExist, GroupController.create);
+GroupRouter.post('/create/:groupName', tryHandler(auth.authenticate), tryHandler(GroupController.create));
-GroupRouter.post('/join/:groupId', auth.authenticate, existance.groupExists, auth.requirePassword, auth.checkGroupPassword, GroupController.join);
+GroupRouter.post('/join/:groupId', tryHandler(auth.authenticate), tryHandler(auth.requirePassword), tryHandler(auth.checkGroupPassword), tryHandler(GroupController.join));
-GroupRouter.post('/password/:groupId', auth.authenticate, existance.groupExists, auth.authorizeGroupOwner, auth.requirePassword, GroupController.updatePassword);
+GroupRouter.post('/password/:groupId', tryHandler(auth.authenticate), tryHandler(auth.authorizeGroupOwner), tryHandler(auth.requirePassword), tryHandler(GroupController.updatePassword));
 
 export default GroupRouter;

src/routers/product.js

@@ -1,11 +1,11 @@
 import { Router } from 'express';
 import auth from '../middlewares/auth.js';
 import ProductController from '../controllers/product.js'
-import existance from '../middlewares/existance.js';
+import tryHandler from '../response/errorHandler.js';
 
 const ProductRouter = new Router();
 
-ProductRouter.post('/create', auth.authenticate, existance.groupExists, auth.userIsInGroup, ProductController.create);
+ProductRouter.post('/create', tryHandler(auth.authenticate), tryHandler(auth.userIsInGroup), tryHandler(ProductController.create));
-ProductRouter.post('/update', auth.authenticate, existance.groupExists, auth.userIsInGroup, existance.productExists, ProductController.update);
+ProductRouter.post('/update', tryHandler(auth.authenticate), tryHandler(auth.userIsInGroup), tryHandler(ProductController.update));
 
 export default ProductRouter;

src/routers/user.js

@@ -1,12 +1,12 @@
 import { Router } from 'express';
 import auth from '../middlewares/auth.js';
-import existance from '../middlewares/existance.js';
 import UserController from '../controllers/user.js';
+import tryHandler from '../response/errorHandler.js';
 
 const UserRouter = new Router();
 
-UserRouter.post('/register', auth.requireUsername, auth.requirePassword, existance.usernameDoesntExist, UserController.register);
+UserRouter.post('/register', tryHandler(auth.requireUsername), tryHandler(auth.requirePassword), tryHandler(UserController.register));
-UserRouter.post('/login', auth.requireUsername, auth.requirePassword, existance.usernameExists, UserController.login);
+UserRouter.post('/login', tryHandler(auth.requireUsername), tryHandler(auth.requirePassword), tryHandler(UserController.login));
-UserRouter.get('/synchronize/:groupId', auth.authenticate, existance.groupExists, auth.userIsInGroup, UserController.synchronize);
+UserRouter.get('/synchronize/:groupId', tryHandler(auth.authenticate), tryHandler(auth.userIsInGroup), tryHandler(UserController.synchronize));
 
 export default UserRouter;

src/services/abstractproduct.js

@@ -1,12 +1,15 @@
 import db from '../db.js';
 import statuses from '../utils/status.js';
 import errorHandler from '../utils/pgerrorhandler.js';
+import tryHandler from '../response/errorHandler.js';
+import responses from '../response/responseCodes.js';
+import customError from '../response/customError.js';
 
 class AbstractProductService {
     async create(groupid, localid, barcode, name, net_weight, image_filename, category, unit) {
         await db.query("INSERT INTO abstract_products (group_id, local_id, barcode, name, net_weight, image_filename, category, unit) VALUES ($1, $2, $3, $4, $5, $6, $7, $8)", [groupid, localid, barcode, name, net_weight, image_filename, category, unit])
             .catch((e) => {
-                errorHandler(e, "abstract product")
+                errorHandler(e, "abstractproduct")
             });
     }
 
@@ -20,21 +23,21 @@ class AbstractProductService {
     async updateName(groupId, localId, name) {
         await db.query("UPDATE abstract_products SET name = $1 WHERE group_id = $2 AND local_id = $3", [name, groupId, localId])
             .catch((e) => {
-                errorHandler(e, "name")
+                errorHandler(e, "abstractproductname")
             });
     }
 
     async updateNetWeight(groupId, localId, net_weight) {
         await db.query("UPDATE abstract_products SET net_weight = $1 WHERE group_id = $2 AND local_id = $3", [net_weight, groupId, localId]
             .catch((e) => {
-                errorHandler(e, "net weight")
+                errorHandler(e, "netweight")
             }));
     }
 
     async updateImageFilename(groupId, localId, image_filename) {
         await db.query("UPDATE abstract_products SET image_filename = $1 WHERE group_id = $2 AND local_id = $3", [image_filename, groupId, localId])
             .catch((e) => {
-                errorHandler(e, "image filename")
+                errorHandler(e, "imagehash")
             });
     }
 
@@ -54,7 +57,7 @@ class AbstractProductService {
 
     async getAll(groupId) {
         let result = (await db.query("SELECT local_id, barcode, name, net_weight, image_filename, category, unit FROM abstract_products WHERE group_id = $1", [groupId])).rows;
-        if (!result) return statuses.not_found;
+        if (!result) throw new customError("getAll abstract products not found", responses.responses.abstractproducts.not_found)
         return result;
     }
 

src/services/category.js

@@ -1,4 +1,6 @@
 import db from '../db.js';
+import customError from '../response/customError.js';
+import responseCodes from '../response/responseCodes.js';
 import statuses from '../utils/status.js';
 
 class CategoryService {
@@ -11,14 +13,14 @@ class CategoryService {
     }
 
     async getById(groupId, localId) {
-        let result = (await db.query("SELECT * FROM categories WHERE group_id = $1 AND local_id = $2", [groupId, localId]))
+        let result = (await db.query("SELECT * FROM categories WHERE group_id = $1 AND local_id = $2", [groupId, localId]));
-        if (result.rowCount == 0) return statuses.not_found;
+        if (result.rowCount == 0) throw new customError(`getById categorirs not found`, responseCodes.responses.category.not_found)
         return result.rows[0];
     }
 
     async getByName(groupId, localId, name) {
         let result = (await db.query("SELECT * FROM categories WHERE group_id = $1 AND local_id = $2 AND name = $3", [groupId, localId, name]));
-        if (result.rowCount == 0) return statuses.not_found;
+        if (result.rowCount == 0) throw new customError(`getByName categories not found`, responseCodes.responses.category.not_found)
         return result.rows[0];
     }
 }

src/services/group.js

@@ -1,17 +1,18 @@
 import db from '../db.js';
+import customError from '../response/customError.js';
+import responseCodes from '../response/responseCodes.js';
 import errorHandler from '../utils/pgerrorhandler.js';
-import status from '../utils/status.js';
 
 class GroupService {
     async create(name, creatorId) {
-        let res = await db.query("INSERT INTO groups (name, admin_id) VALUES ($1, $2) RETURNING ID", [name, creatorId]).catch(errorHandler);
+        let res = await db.query("INSERT INTO groups (name, admin_id) VALUES ($1, $2) RETURNING ID", [name, creatorId]).catch((e) => errorHandler(e, "group"));
 
         return res.rows[0];
     }
 
     async getById(id) {
         let res = (await db.query("SELECT * FROM groups WHERE id = $1", [id]));
-        if (res.rowCount == 0) return status.not_found;
+        if (res.rowCount == 0) throw new customError(`getByUd group not found`, responseCodes.responses.groups.id_not_found);
         return res.rows[0];
     }
 
@@ -28,7 +29,9 @@ class GroupService {
     }
 
     async getByName(name) {
-        return (await db.query("SELECT * FROM groups WHERE name = $1", [name])).rows[0];
+        let res = (await db.query("SELECT * FROM groups WHERE name = $1", [name]));
+        if (res.rowCount == 0) throw new customError(`getByName group not found`, responseCodes.responses.groups.name_not_found);
+        return res.rows[0];
     }
 };
 

src/services/product.js

@@ -1,19 +1,20 @@
 import db from '../db.js';
-import statuses from '../utils/status.js';
 import errorHandler from '../utils/pgerrorhandler.js';
+import customError from '../response/customError.js';
+import responseCodes from '../response/responseCodes.js';
 
 class ProductService {
     async create(groupid, localid, abstract_product_id, amount, date_of_production, expiry_date) {
         await db.query("INSERT INTO products (group_id, local_id, abstract_product_id, amount, date_of_production, expiry_date) VALUES ($1, $2, $3, $4, $5, $6)", [groupid, localid, abstract_product_id, amount, date_of_production, expiry_date])
             .catch((e) => {
-                errorHandler(e, "Abstract Product")
+                errorHandler(e, "product")
             });
     }
 
     async updateAbstractProductId(groupId, localId, abstract_product_id) {
         await db.query("UPDATE products SET abstract_product_id = $1 WHERE group_id = $2 AND local_id = $3", [abstract_product_id, groupId, localId])
             .catch((e) => {
-                errorHandler(e, "abstract product id")
+                errorHandler(e, "abstractproductid")
             });
 
     }
@@ -28,20 +29,20 @@ class ProductService {
     async updateDateOfProduction(groupId, localId, date_of_production) {
         await db.query("UPDATE products SET date_of_production = $1 WHERE group_id = $2 AND local_id = $3", [date_of_production, groupId, localId])
             .catch((e) => {
-                errorHandler(e, "date of production")
+                errorHandler(e, "dateofproduction")
             });
     }
 
     async updateExpiryDate(groupId, localId, expiry_date) {
         await db.query("UPDATE products SET expiry_date = $1 WHERE group_id = $2 AND local_id = $3", [expiry_date, groupId, localId])
             .catch((e) => {
-                errorHandler(e, "expiry date")
+                errorHandler(e, "expirydate")
             });
     }
 
     async getAll(groupId) {
         let result = (await db.query("SELECT local_id, abstract_product_id, amount, date_of_production, expiry_date FROM products WHERE group_id = $1", [groupId])).rows;
-        if (!result) return statuses.not_found;
+        if (!result) throw new customError(`getAll product not found`, responseCodes.responses.products.not_found);
         return result;
     }
 

src/services/user.js

@@ -1,4 +1,6 @@
 import db from '../db.js'
+import customError from '../response/customError.js';
+import responseCodes from '../response/responseCodes.js';
 import statuses from '../utils/status.js';
 import bcrypt from 'bcrypt';
 
@@ -12,12 +14,14 @@ class UserService {
 
     async getByUsername(username) {
         let user = (await db.query("SELECT * FROM Users WHERE username = $1", [username])).rows;
-        if (user == undefined) return statuses.not_found;
+        if (user == undefined) throw new customError(`getByUsername user not found`, responseCodes.responses.usernames.not_found);
         return (user[0]);
     }
 
     async getAll() {
-        return (await db.query("SELECT * FROM Users")).rows;
+        let res = await db.query("SELECT * FROM Users");
+        if (res.rowCount == 0) throw new customError(`getAll user not found`, responseCodes.responses.usernames.not_found);
+        return res.rows[0]
     }
 
     async isInGroup(userId, groupId) {
@@ -25,7 +29,7 @@ class UserService {
     }
 
     async joinGroup(userId, groupId) {
-        if (await (this.isInGroup(userId, groupId))) return statuses.duplicate;
+        if (await (this.isInGroup(userId, groupId))) throw new customError(`joinGroup user already in group`, responseCodes.responses.user.already_in_group);
         await db.query("UPDATE Users SET groups = array_append(groups, $1::integer) WHERE ID = $2", [groupId, userId]);
         return statuses.ok;
     }

src/utils/log.js

@@ -2,23 +2,23 @@ import config from '../../config.json' with {type: "json"};
 
 const debug = (text) => {
     if (config.debug) console.debug(`[D] [${Date()}]: ${text}`);
-}
+};
 
 const info = (text) => {
     console.log(`[I] [${Date()}]: ${text}`);
-}
+};
 
 const error = (text) => {
     console.error(`[E] [${Date()}]: ${text}`);
-}
+};
 
 const warn = (text) => {
     console.warn(`[W] [${Date()}]: ${text}`);
-}
+};
 
 const unknownError = (text) => {
     error(text);
     return "Unknown server error. Please, report to the developer";
-}
+};
 
 export default { debug, info, error, warn, unknownError };

src/utils/pgerrorhandler.js

@@ -1,28 +1,16 @@
-import statuses from "./status.js";
+import customError from "../response/customError.js";
+import responseCodes from "../response/responseCodes.js";
 
 const errorHandler = (e, obj) => {
     switch (e.code) {
         case '23505':
-            throw {
+            throw new customError(`Duplicate ${obj}`, responseCodes.responses[obs].duplicate)
-                status: statuses.duplicate,
-                message: `Such ${obj} already exists`
-            };
         case '22007':
-            throw {
+            throw new customError(`Invalid syntax ${obj}`, responseCodes.responses.general.invalid_syntax)
-                status: statuses.invalid_syntax,
-                message: `Invalid syntax in ${obj}`
-            };
         case '22001':
-            throw {
+            throw new customError(`Value too long ${obj}`, responseCodes.responses[obj].too_long)
-                status: statuses.invalid_syntax,
-                message: `Value too long (${obj})`
-            };
         default:
-            throw {
+            throw new customError(`Unknown error ${obj}`, responseCodes.responses.general.unknown)
-                status: statuses.unknown,
-                message: `Unknown error. Please, report to the developer`,
-                original: e
-            };
     };
 };
 

src/utils/status.js

@@ -1,9 +0,0 @@
-const statuses = {
-    ok: "ok",
-    duplicate: "duplicate",
-    not_found: "not found",
-    invalid_syntax: "invalid syntax",
-    unknown: "unknown"
-};
-
-export default statuses;

src/utils/translate.js

@@ -0,0 +1,7 @@
+const translate = (language, code) => {
+    if (!language) language = "en-US"
+    if (!code) code = "unknown"
+    return JSON.parse(fs.readFileSync(`../../messages/${language}/msgs.json`).toString())[code]
+}
+
+export default translate