Add initial project files

apps/backend/app/exceptions/api_exception.ts

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+import { Exception } from '@adonisjs/core/exceptions'
+import type { HttpContext } from '@adonisjs/core/http'
+
+export default class ApiException extends Exception {
+  async handle(error: this, ctx: HttpContext) {
+    ctx.response.status(error.status).send({ message: error.message, code: error.code })
+  }
+}

apps/backend/app/exceptions/file_manager_exceptions.ts

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+import ApiException from '#exceptions/api_exception'
+
+export class FilenameMissingExtensionException extends ApiException {
+  static status = 400
+  static code = 'E_FILE_NAME_MISSING_EXTENSION'
+
+  constructor(message: string = 'File name missing extension') {
+    super(message)
+  }
+}
+
+export class EntryNameNotChangedException extends ApiException {
+  static status = 400
+  static code = 'E_ENTRY_NAME_NOT_CHANGED'
+
+  constructor(message: string = 'Entry name was not changed') {
+    super(message)
+  }
+}
+
+export class EntryExistsException extends ApiException {
+  static status = 400
+  static code = 'E_ENTRY_ALREADY_EXISTS'
+
+  constructor(message: string = 'Entry already exists') {
+    super(message)
+  }
+}
+
+export class DirExistsException extends ApiException {
+  static status = 400
+  static code = 'E_DIRECTORY_ALREADY_EXISTS'
+
+  constructor(message: string = 'Directory already exists') {
+    super(message)
+  }
+}
+
+export class FileNotFoundException extends ApiException {
+  static status = 404
+  static code = 'E_FILE_NOT_FOUND'
+
+  constructor(message: string = 'File not found') {
+    super(message)
+  }
+}
+
+export class DirNotFoundException extends ApiException {
+  static status = 404
+  static code = 'E_DIR_NOT_FOUND'
+
+  constructor(message: string = 'Directory not found') {
+    super(message)
+  }
+}

apps/backend/app/exceptions/handler.ts

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+import app from '@adonisjs/core/services/app'
+import { HttpContext, ExceptionHandler } from '@adonisjs/core/http'
+
+export default class HttpExceptionHandler extends ExceptionHandler {
+  /**
+   * In debug mode, the exception handler will display verbose errors
+   * with pretty printed stack traces.
+   */
+  protected debug = !app.inProduction
+
+  /**
+   * The method is used for handling errors and returning
+   * response to the client
+   */
+  async handle(error: unknown, ctx: HttpContext) {
+    return super.handle(error, ctx)
+  }
+
+  /**
+   * The method is used to report error to the logging service or
+   * the third party error monitoring service.
+   *
+   * @note You should not attempt to send a response from this method.
+   */
+  async report(error: unknown, ctx: HttpContext) {
+    return super.report(error, ctx)
+  }
+}

apps/backend/app/exceptions/web_manager_exceptions.ts

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+import ApiException from '#exceptions/api_exception'
+
+export class PageNotFoundException extends ApiException {
+  static status = 404
+  static code = 'E_PAGE_NOT_FOUND'
+
+  constructor(resource: string = 'Page') {
+    super(`${resource} not found`)
+  }
+}
+
+export class PageRouteConflictException extends ApiException {
+  static status = 409
+  static code = 'E_PAGE_ROUTE_CONFLICT'
+
+  constructor(locale: string, path: string) {
+    super(`A page already uses /${locale}/${path}`)
+  }
+}
+
+export class PageNotPublishedException extends ApiException {
+  static status = 409
+  static code = 'E_PAGE_NOT_PUBLISHED'
+
+  constructor() {
+    super('Only a published page can be unpublished')
+  }
+}
+
+export class InvalidPagePayloadException extends ApiException {
+  static status = 422
+  static code = 'E_INVALID_PAGE_PAYLOAD'
+
+  constructor(message: string = 'Invalid page payload') {
+    super(message)
+  }
+}
+
+export class PageMediaFileMissingException extends ApiException {
+  static status = 422
+  static code = 'E_PAGE_MEDIA_FILE_MISSING'
+
+  constructor(fileKey: string) {
+    super(`Missing uploaded file for key "${fileKey}"`)
+  }
+}
+
+export class PageMediaFileInvalidException extends ApiException {
+  static status = 422
+  static code = 'E_PAGE_MEDIA_FILE_INVALID'
+
+  constructor(fileKey: string, message?: string) {
+    super(message || `Invalid uploaded file for key "${fileKey}"`)
+  }
+}