add: interfaces to connect a database provider

- easy swapping between database provider

src/server/databases/providers/inmemory.ts → src/adapters/database/inmemory.ts

@@ -1,16 +1,15 @@
-import type { SessionConfig } from 'h3';
-import type { Identity } from '../database';
-import type System from '../entities/system';
-import type User from '../entities/user';
-import type { UserProvider } from '../entities/user';
-import type { SystemProvider } from '../entities/system';
-import type DatabaseProvider from '../database';
-
-import { ChartType } from '../entities/system';
 import debug from 'debug';
-
 import packageJson from '@/package.json';
 
+import DatabaseProvider from '~/ports/database';
+import { ChartType, Lang } from '~/ports/types';
+import { ROLE } from '~/ports/user/model';
+
+import type { SessionConfig } from 'h3';
+import type { System } from '~/ports/system/model';
+import type { User } from '~/ports/user/model';
+import type { Identity } from '~/ports/types';
+
 const INMDP_DEBUG = debug('InMemoryDP');
 
 // Represent in-memory data structure
@@ -20,12 +19,10 @@ type InMemoryData = {
 };
 
 // In-Memory Database Provider
-export default class InMemoryDP
+export class InMemory extends DatabaseProvider {
-  implements DatabaseProvider, UserProvider, SystemProvider
+  protected data: InMemoryData = { users: [] };
-{
-  private data: InMemoryData = { users: [] };
 
-  async connect() {
+  override async connect() {
     INMDP_DEBUG('Connection...');
     const system: System = {
       release: packageJson.release.version,
@@ -37,7 +34,7 @@ export default class InMemoryDP
       port: 51821,
       webuiHost: '0.0.0.0',
       sessionTimeout: 3600, // 1 hour
-      lang: 'en',
+      lang: Lang.EN,
       userConfig: {
         mtu: 1420,
         persistentKeepalive: 0,
@@ -76,13 +73,13 @@ export default class InMemoryDP
     INMDP_DEBUG('Connection done');
   }
 
-  async disconnect() {
+  override async disconnect() {
     this.data = { users: [] };
   }
 
-  async getSystem() {
+  override async getSystem() {
     INMDP_DEBUG('Get System');
-    return this.data.system || null;
+    return this.data.system;
   }
 
   async saveSystem(system: System) {
@@ -90,11 +87,15 @@ export default class InMemoryDP
     this.data.system = system;
   }
 
-  async getUsers() {
+  override async getLang() {
+    return this.data.system?.lang || Lang.EN;
+  }
+
+  override async getUsers() {
     return this.data.users;
   }
 
-  async getUser(id: Identity<User>) {
+  override async getUser(id: Identity<User>) {
     INMDP_DEBUG('Get User');
     if (typeof id === 'string') {
       return this.data.users.find((user) => user.id === id);
@@ -102,14 +103,37 @@ export default class InMemoryDP
     return this.data.users.find((user) => user.id === id.id);
   }
 
-  async saveUser(user: User) {
+  override async saveUser(user: User) {
     let _user = await this.getUser(user);
     if (_user) {
       INMDP_DEBUG('Update User');
       _user = user;
     } else {
       INMDP_DEBUG('New User');
+      if (this.data.users.length == 0) {
+        // first user is admin
+        user.role = ROLE.ADMIN;
+      }
       this.data.users.push(user);
     }
   }
+
+  override async deleteUser(id: Identity<User>) {
+    const _id = typeof id === 'string' ? id : id.id;
+    const idx = this.data.users.findIndex((user) => user.id == _id);
+    if (idx !== -1) {
+      this.data.users.splice(idx, 1);
+    }
+  }
+}
+
+export default function initInMemoryProvider() {
+  const provider = new InMemory();
+
+  provider.connect().catch((err) => {
+    console.error(err);
+    process.exit(1);
+  });
+
+  return provider;
 }

src/composables/useDatabase.ts

@@ -0,0 +1,5 @@
+import type { InMemory } from '~/adapters/database/inmemory';
+
+export default (): InMemory => {
+  return useNuxtApp().$database;
+};

src/plugins/database.server.ts

@@ -0,0 +1,15 @@
+/**
+ * Changing the Database Provider
+ * This design allows for easy swapping of different database implementations.
+ *
+ */
+
+import initInMemoryProvider from '~/adapters/database/inmemory';
+
+export default defineNuxtPlugin(() => {
+  return {
+    provide: {
+      database: initInMemoryProvider(),
+    },
+  };
+});

src/ports/database.ts

@@ -0,0 +1,46 @@
+import type SystemRepository from './system/interface';
+import type UserRepository from './user/interface';
+import type { Identity, Undefined, Lang } from './types';
+import type { User } from './user/model';
+import type { System } from './system/model';
+
+/**
+ * Abstract class for database operations.
+ * Provides methods to connect, disconnect, and interact with system and user data.
+ */
+export default abstract class DatabaseProvider
+  implements SystemRepository, UserRepository
+{
+  /**
+   * Connects to the database.
+   */
+  connect(): Promise<void> {
+    throw new Error('Method not implemented.');
+  }
+  /**
+   * Disconnects from the database.
+   */
+  disconnect(): Promise<void> {
+    throw new Error('Method not implemented.');
+  }
+
+  getSystem(): Promise<System | Undefined> {
+    throw new Error('Method not implemented.');
+  }
+  getLang(): Promise<Lang> {
+    throw new Error('Method not implemented.');
+  }
+
+  getUsers(): Promise<Array<User>> {
+    throw new Error('Method not implemented.');
+  }
+  getUser(_id: Identity<User>): Promise<User | Undefined> {
+    throw new Error('Method not implemented.');
+  }
+  saveUser(_user: User): Promise<void> {
+    throw new Error('Method not implemented.');
+  }
+  deleteUser(_id: Identity<User>): Promise<void> {
+    throw new Error('Method not implemented.');
+  }
+}

src/ports/system/interface.ts

@@ -0,0 +1,22 @@
+import type { Lang, Undefined } from '../types';
+import type { System } from './model';
+
+/**
+ * Interface for system-related database operations.
+ * This interface provides methods for retrieving system configuration data
+ * and specific system properties, such as the language setting, from the database.
+ */
+export default interface SystemRepository {
+  /**
+   * Retrieves the system configuration data from the database.
+   * @returns {Promise<System | Undefined>} A promise that resolves to the system data
+   * if found, or `undefined` if the system data is not available.
+   */
+  getSystem(): Promise<System | Undefined>;
+
+  /**
+   * Retrieves the system's language setting.
+   * @returns {Promise<Lang>} The current language setting of the system.
+   */
+  getLang(): Promise<Lang>;
+}

src/ports/system/model.ts

@@ -0,0 +1,44 @@
+import type { SessionConfig } from 'h3';
+import type {
+  Address,
+  IpTables,
+  Lang,
+  Port,
+  Prometheus,
+  SessionTimeOut,
+  String,
+  Boolean,
+  TrafficStats,
+  Version,
+  WGConfig,
+  WGInterface,
+} from '../types';
+
+/**
+ * Representing the WireGuard network configuration data structure of a computer interface system.
+ */
+export type System = {
+  interface: WGInterface;
+
+  release: Version;
+  port: number;
+  webuiHost: String;
+  // maxAge
+  sessionTimeout: SessionTimeOut;
+  lang: Lang;
+
+  userConfig: WGConfig;
+
+  wgPath: String;
+  wgDevice: String;
+  wgHost: Address;
+  wgPort: Port;
+  wgConfigPort: Port;
+
+  iptables: IpTables;
+  trafficStats: TrafficStats;
+
+  wgEnableExpiresTime: Boolean;
+  prometheus: Prometheus;
+  sessionConfig: SessionConfig;
+};

src/ports/types.ts

@@ -0,0 +1,55 @@
+export type Undefined = null | undefined | 0 | '';
+export enum Lang {
+  /* english */
+  EN = 'en',
+  /* french */
+  FR = 'fr',
+}
+export type String = string;
+export type ID = String;
+export type Boolean = boolean;
+export type Version = String;
+export type SessionTimeOut = number;
+export type Port = number;
+export type Address = String;
+export type HashPassword = String;
+export type Command = String;
+export type Key = String;
+export type IpTables = {
+  wgPreUp: Command;
+  wgPostUp: Command;
+  wgPreDown: Command;
+  wgPostDown: Command;
+};
+export type WGInterface = {
+  privateKey: Key;
+  publicKey: Key;
+  address: Address;
+};
+export type WGConfig = {
+  mtu: number;
+  persistentKeepalive: number;
+  rangeAddress: Address;
+  defaultDns: Array<Address>;
+  allowedIps: Array<Address>;
+};
+export enum ChartType {
+  None = 0,
+  Line = 1,
+  Area = 2,
+  Bar = 3,
+}
+export type TrafficStats = {
+  enabled: boolean;
+  type: ChartType;
+};
+export type Prometheus = {
+  enabled: boolean;
+  password?: HashPassword | Undefined;
+};
+/**
+ * `id` of T or T.
+ *
+ * @template T - The specific type that can be used in place of id String.
+ */
+export type Identity<T> = ID | T;

src/ports/user/interface.ts

@@ -0,0 +1,39 @@
+import type { Identity, Undefined } from '../types';
+import type { User } from './model';
+
+/**
+ * Interface for user-related database operations.
+ * This interface provides methods for managing user data.
+ */
+export default interface UserRepository {
+  /**
+   * Retrieves all users from the database.
+   * @returns {Promise<Array<User>>} A array of users data.
+   */
+  getUsers(): Promise<Array<User>>;
+
+  /**
+   * Retrieves a user by their ID or User object from the database.
+   * @param {Identity<User>} id - The ID of the user or a User object.
+   * @returns {Promise<User | Undefined>} A promise that resolves to the user data
+   * if found, or `undefined` if the user is not available.
+   */
+  getUser(id: Identity<User>): Promise<User | Undefined>;
+
+  /**
+   * Creates or updates a user in the database.
+   * @param {User} user - The user to be saved.
+   *
+   * **Note:** If the user already exists, this method will update their details.
+   * If the user does not exist, it will create a new user entry.
+   * @returns {Promise<void>} A promise that resolves when the operation is complete.
+   */
+  saveUser(user: User): Promise<void>;
+
+  /**
+   * Deletes a user from the database.
+   * @param {Identity<User>} id - The ID of the user or a User object to be deleted.
+   * @returns {Promise<void>} A promise that resolves when the user has been deleted.
+   */
+  deleteUser(id: Identity<User>): Promise<void>;
+}

src/ports/user/model.ts

@@ -0,0 +1,28 @@
+import type { Address, ID, Key, HashPassword, String } from '../types';
+
+export enum ROLE {
+  /* Full permissions to any resources (app, database...) */
+  ADMIN = 'ADMIN',
+  /* Grants write and read permissions on their own resources and `CLIENT` resources without `ADMIN` permissions */
+  EDITOR = 'EDITOR',
+  /* Grants write and read permissions on their own resources  */
+  CLIENT = 'CLIENT',
+}
+
+/**
+ * Representing a user data structure.
+ */
+export type User = {
+  id: ID;
+  role: ROLE;
+  username: String;
+  password: HashPassword;
+  name: String;
+  address: Address;
+  privateKey: Key;
+  publicKey: Key;
+  preSharedKey: String;
+  createdAt: Date;
+  updatedAt: Date;
+  enabled: boolean;
+};

src/server/api/lang.get.ts

@@ -1,7 +1,7 @@
+import useDatabase from '~/composables/useDatabase';
+
 export default defineEventHandler(async (event) => {
   setHeader(event, 'Content-Type', 'application/json');
-
+  const db = useDatabase();
-  const provider = InMemory; // TODO multiple provider
+  return db.getLang();
-  const lang = await SystemRepository.getLang(provider);
-  return lang;
 });

src/server/databases/database.ts

@@ -1,22 +0,0 @@
-export type Undefined = null | undefined | 0 | '';
-/**
- * `id` of T or T.
- *
- * @template T - The specific type that can be used in place of id string.
- */
-export type Identity<T> = string | T;
-
-/**
- * Abstract class for database operations.
- * Provides methods to connect, disconnect, and interact with system and user data.
- */
-export default abstract class DatabaseProvider {
-  /**
-   * Connects to the database.
-   */
-  abstract connect(): Promise<void>;
-  /**
-   * Disconnects from the database.
-   */
-  abstract disconnect(): Promise<void>;
-}

src/server/databases/entities/system.ts

@@ -1,86 +0,0 @@
-import type { SessionConfig } from 'h3';
-import type { Undefined } from '../database';
-
-export type Lang = 'en' | 'ua' | 'ru' | 'tr' | 'no' | 'pl' | 'fr';
-export type Version = string;
-export type SessionTimeOut = number;
-export type Port = number;
-export type Address = string;
-export type PassordHash = string;
-export type Command = string;
-export type Key = string;
-export type IpTables = {
-  wgPreUp: Command;
-  wgPostUp: Command;
-  wgPreDown: Command;
-  wgPostDown: Command;
-};
-export type WGInterface = {
-  privateKey: Key;
-  publicKey: Key;
-  address: Address;
-};
-export type WGConfig = {
-  mtu: number;
-  persistentKeepalive: number;
-  rangeAddress: Address;
-  defaultDns: Array<Address>;
-  allowedIps: Array<Address>;
-};
-export enum ChartType {
-  None = 0,
-  Line = 1,
-  Area = 2,
-  Bar = 3,
-}
-export type TrafficStats = {
-  enabled: boolean;
-  type: ChartType;
-};
-export type Prometheus = {
-  enabled: boolean;
-  password?: PassordHash | Undefined;
-};
-
-/**
- * Representing the WireGuard network configuration data structure of a computer interface system.
- */
-type System = {
-  interface: WGInterface;
-
-  release: Version;
-  port: number;
-  webuiHost: string;
-  // maxAge
-  sessionTimeout: SessionTimeOut;
-  lang: Lang;
-
-  userConfig: WGConfig;
-
-  wgPath: string;
-  wgDevice: string;
-  wgHost: Address;
-  wgPort: Port;
-  wgConfigPort: Port;
-
-  iptables: IpTables;
-  trafficStats: TrafficStats;
-
-  wgEnableExpiresTime: boolean;
-  prometheus: Prometheus;
-  sessionConfig: SessionConfig;
-};
-
-export default System;
-
-/**
- * Abstract class for system-related database operations.
- * This class provides a method for retrieving system configuration data from the database.
- */
-export abstract class SystemProvider {
-  /**
-   * Retrieves system data from the database.
-   * @returns {Promise<System | Undefined>} The system data or null if not found.
-   */
-  abstract getSystem(): Promise<System | Undefined>;
-}

src/server/databases/entities/user.ts

@@ -1,52 +0,0 @@
-import type { Identity, Undefined } from '../database';
-import type { Address, Key, PassordHash } from './system';
-
-export type ROLE = 'ADMIN';
-
-/**
- * Representing a user data structure.
- */
-type User = {
-  id: string;
-  roles: Array<ROLE>;
-  username: string;
-  password: PassordHash;
-  name: string;
-  address: Address;
-  privateKey: Key;
-  publicKey: Key;
-  preSharedKey: string;
-  createdAt: Date;
-  updatedAt: Date;
-  enabled: boolean;
-};
-
-export default User;
-
-/**
- * Abstract class for user-related database operations.
- * This class provides methods for retrieving and saving user data.
- */
-export abstract class UserProvider {
-  /**
-   * Retrieves all users from the database.
-   * @returns {Promise<Array<User>>} The array of users data.
-   */
-  abstract getUsers(): Promise<Array<User>>;
-
-  /**
-   * Retrieves a user by their ID or by User structure from the database.
-   * @param {Identity<User>} id - The ID of the user or a user.
-   * @returns {Promise<User | Undefined>} The user data or null if not found.
-   */
-  abstract getUser(id: Identity<User>): Promise<User | Undefined>;
-
-  /**
-   * Creates or Updates a user in the database.
-   * @param {User} user - The user to be saved.
-   *
-   * **Note:** If the user already exists, this method will update their details.
-   * If the user does not exist, it will create a new user entry.
-   */
-  abstract saveUser(user: User): Promise<void>;
-}

src/server/utils/databases/InMemory.ts

@@ -1,12 +0,0 @@
-import InMemoryDP from '@/server/databases/providers/inmemory';
-
-const provider = new InMemoryDP(); // TODO multiple providers
-
-provider.connect().catch((err) => {
-  console.error(err);
-  provider.disconnect().catch((err) => {
-    console.error(err);
-  });
-});
-
-export default provider;

src/server/utils/repositories/SystemRepository.ts

@@ -1,14 +0,0 @@
-import type { Lang, SystemProvider } from '@/server/databases/entities/system';
-
-class SystemRepository {
-  async getLang(provider: SystemProvider): Promise<Lang> {
-    const _system = await provider.getSystem();
-    if (_system) {
-      const { lang } = _system;
-      return lang;
-    }
-    return 'en';
-  }
-}
-
-export default new SystemRepository();

src/server/utils/repositories/UserRepository.ts

@@ -1,11 +0,0 @@
-import type User from '@/server/databases/entities/user';
-import type { UserProvider } from '@/server/databases/entities/user';
-import type { Undefined } from '@/server/databases/database';
-
-class UserRepository {
-  newUser(db: UserProvider): Promise<User | Undefined> {
-    return db.getUser('');
-  }
-}
-
-export default new UserRepository();