WIP

packages/server/src/services/Import/ImportFileUpload.ts

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+import { first } from 'lodash';
+import { Inject, Service } from 'typedi';
+import { snakeCase, upperFirst } from 'lodash';
+import XLSX from 'xlsx';
+import * as R from 'ramda';
+import HasTenancyService from '../Tenancy/TenancyService';
+import { trimObject } from './_utils';
+const fs = require('fs').promises;
+
+@Service()
+export class ImportFileUploadService {
+  @Inject()
+  private tenancy: HasTenancyService;
+
+  /**
+   * Reads the imported file and stores the import file meta under unqiue id.
+   * @param {number} tenantId -
+   * @param {string} filePath -
+   * @param {string} fileName -
+   * @returns
+   */
+  public async import(
+    tenantId: number,
+    resource: string,
+    filePath: string,
+    filename: string
+  ) {
+    const { Import } = this.tenancy.models(tenantId);
+    const buffer = await fs.readFile(filePath);
+    const workbook = XLSX.read(buffer, { type: 'buffer' });
+
+    const firstSheetName = workbook.SheetNames[0];
+    const worksheet = workbook.Sheets[firstSheetName];
+    const jsonData = XLSX.utils.sheet_to_json(worksheet);
+
+    const _resource = upperFirst(snakeCase(resource));
+
+    const exportFile = await Import.query().insert({
+      filename,
+      importId: filename,
+      resource: _resource,
+    });
+    const columns = this.getColumns(jsonData);
+
+    return {
+      ...exportFile,
+      columns,
+    };
+  }
+
+  private getColumns(json: unknown[]) {
+    return R.compose(Object.keys, trimObject, first)(json);
+  }
+}