Implemented separate class for importing/exporting the entities

src/lib/extension/EntitiesTransporter.ts

@@ -0,0 +1,73 @@
+import {validateImportedEntity} from "$lib/extension/transporting/validators.js";
+import {exportEntityToObject} from "$lib/extension/transporting/exporters.js";
+import StorageEntity from "./base/StorageEntity.js";
+import {compressToEncodedURIComponent, decompressFromEncodedURIComponent} from "lz-string";
+
+type EntityConstructor<T extends StorageEntity> =
+  (new (id: string, settings: Record<string, any>) => T)
+  & typeof StorageEntity;
+
+export default class EntitiesTransporter<EntityType extends StorageEntity> {
+  readonly #targetEntityConstructor: EntityConstructor<EntityType>;
+
+  constructor(entityConstructor: EntityConstructor<EntityType>) {
+    this.#targetEntityConstructor = entityConstructor;
+  }
+
+  importFromJSON(jsonString: string): EntityType {
+    const importedObject = this.#tryParsingAsJSON(jsonString);
+
+    if (!importedObject) {
+      throw new Error('Invalid JSON!');
+    }
+
+    validateImportedEntity(
+      importedObject,
+      this.#targetEntityConstructor._entityName
+    );
+
+    return new this.#targetEntityConstructor(
+      importedObject.id,
+      importedObject
+    );
+  }
+
+  importFromCompressedJSON(compressedJsonString: string): EntityType {
+    return this.importFromJSON(
+      decompressFromEncodedURIComponent(compressedJsonString)
+    )
+  }
+
+  exportToJSON(entityObject: EntityType): string {
+    if (!(entityObject instanceof this.#targetEntityConstructor)) {
+      throw new TypeError('Transporter should be connected to the same entity to export!');
+    }
+
+    const exportableObject = exportEntityToObject(
+      entityObject,
+      this.#targetEntityConstructor._entityName
+    );
+
+    return JSON.stringify(exportableObject, null, 2);
+  }
+
+  exportToCompressedJSON(entityObject: EntityType): string {
+    return compressToEncodedURIComponent(this.exportToJSON(entityObject));
+  }
+
+  #tryParsingAsJSON(jsonString: string): Record<string, any> | null {
+    let jsonObject: Record<string, any> | null = null;
+
+    try {
+      jsonObject = JSON.parse(jsonString);
+    } catch (e) {
+
+    }
+
+    if (typeof jsonObject !== "object") {
+      throw new TypeError("Should be an object!");
+    }
+
+    return jsonObject
+  }
+}

src/lib/extension/transporting/exporters.js

@@ -0,0 +1,26 @@
+/**
+ * @type {Map<string, ((entity: import('../base/StorageEntity.js').default) => Record<string, any>)>}
+ */
+const entitiesExporters = new Map([
+  ['profiles', /** @param {import('../entities/MaintenanceProfile.js').default} entity */entity => {
+    return {
+      v: 1,
+      id: entity.id,
+      name: entity.settings.name,
+      tags: entity.settings.tags,
+    }
+  }]
+])
+
+/**
+ * @param entityInstance
+ * @param {string} entityName
+ * @returns {Record<string, *>}
+ */
+export function exportEntityToObject(entityInstance, entityName) {
+  if (!entitiesExporters.has(entityName)) {
+    throw new Error(`Missing exporter for entity: ${entityName}`);
+  }
+
+  return entitiesExporters.get(entityName).call(null, entityInstance);
+}

src/lib/extension/transporting/validators.js

@@ -0,0 +1,39 @@
+/**
+ * Map of validators for each entity. Function should throw the error if validation failed.
+ * @type {Map<string, ((importedObject: Object) => void)>}
+ */
+const entitiesValidators = new Map([
+  ['profiles', importedObject => {
+    if (importedObject.v !== 1) {
+      throw new Error('Unsupported version!');
+    }
+
+    if (
+      !importedObject.id
+      || typeof importedObject.id !== "string"
+      || !importedObject.name
+      || typeof importedObject.name !== "string"
+      || !importedObject.tags
+      || !Array.isArray(importedObject.tags)
+    ) {
+      throw new Error('Invalid profile format detected!');
+    }
+  }]
+])
+
+/**
+ * Validate the structure of the entity.
+ * @param {Object} importedObject Object imported from JSON.
+ * @param {string} entityName Name of the entity to validate. Should be loaded from the entity class.
+ * @throws {Error} Error in case validation failed with the reason stored in the message.
+ */
+export function validateImportedEntity(importedObject, entityName) {
+  if (!entitiesValidators.has(entityName)) {
+    console.error(`Trying to validate entity without the validator present! Entity name: ${entityName}`);
+    return;
+  }
+
+  entitiesValidators
+    .get(entityName)
+    .call(null, importedObject);
+}