- added npm package dotenv-webpack for using env variables on clientside

- added API File Controller for downloading files e.g. /api/download/1022
- also create has codes by submitting new dataset
- added edit dataset functionalities for role submitter
- added the following route for role submitter: /dataset/:id/update', 'DatasetController.update'
- created extra UpdateDatasetValidator.ts for validating updated dataset
- npm updates

app/Controllers/Http/Api/FileController.ts

@@ -0,0 +1,54 @@
+import type { HttpContextContract } from '@ioc:Adonis/Core/HttpContext';
+import File from 'App/Models/File';
+import { StatusCodes } from 'http-status-codes';
+import * as fs from 'fs';
+import * as path from 'path';
+
+// node ace make:controller Author
+export default class FileController {
+    // @Get("download/:id")
+    public async findOne({ response, params }: HttpContextContract) {
+        const id = params.id;
+        const file = await File.findOrFail(id);
+        // const file = await File.findOne({
+        //     where: { id: id },
+        // });
+        if (file) {
+            const filePath = '/storage/app/public/' + file.pathName;
+            const ext = path.extname(filePath);
+            const fileName = file.label + ext;
+            try {
+                fs.accessSync(filePath, fs.constants.R_OK); //| fs.constants.W_OK);
+                // console.log("can read/write:", path);
+               
+                response
+                    .header('Cache-Control', 'no-cache private')
+                    .header('Content-Description', 'File Transfer')
+                    .header('Content-Type', file.mimeType)
+                    .header('Content-Disposition', 'inline; filename=' + fileName)
+                    .header('Content-Transfer-Encoding', 'binary')
+                    .header('Access-Control-Allow-Origin', '*')
+                    .header('Access-Control-Allow-Methods', 'GET,POST');
+                
+                response.status(StatusCodes.OK).download(filePath);               
+            } catch (err) {
+                // console.log("no access:", path);
+                response.status(StatusCodes.NOT_FOUND).send({
+                    message: `File with id ${id} doesn't exist on file server`,
+                });
+            }
+
+            // res.status(StatusCodes.OK).sendFile(filePath, (err) => {
+            //     // res.setHeader("Content-Type", "application/json");
+            //     // res.removeHeader("Content-Disposition");
+            //     res.status(StatusCodes.NOT_FOUND).send({
+            //         message: `File with id ${id} doesn't exist on file server`,
+            //     });
+            // });
+        } else {
+            response.status(StatusCodes.NOT_FOUND).send({
+                message: `Cannot find File with id=${id}.`,
+            });
+        }
+    }
+}