chore(backend): Opzetten processing begonnen.

Functionaliteit van Dwengo Learning-Object-Repository in ons project gekopiëerd en deels aanBestanden die enkel types of interfaces exporteren hernoemd naar *.d.tsgepast aan TypeScript en ons project.

backend/src/services/learning-objects/processing/gift/gift_processor.js

@@ -0,0 +1,52 @@
+import Processor from "../processor.ts";
+import { isValidHttpUrl } from '../../utils/utils.js'
+import { findFile } from '../../utils/file_io.js'
+import InvalidArgumentError from '../../utils/invalid_argument_error.js'
+import DOMPurify from 'isomorphic-dompurify';
+import ProcessingHistory from "../../models/processing_history.js";
+import path from "path"
+import fs from "fs"
+import { parse } from "gift-pegjs"
+
+class GiftProcessor extends Processor {
+
+    constructor() {
+        super();
+        this.types = ["text/gift"]
+    }
+
+    /**
+     *
+     * @param {string} audioUrl
+     * @param {object} args Optional arguments specific to the render function of the GiftProcessor
+     * @returns
+     */
+    render(giftString, args = { }) {
+
+        const quizQuestions = parse(giftString);
+        console.log(quizQuestions);
+
+
+        return DOMPurify.sanitize(`<audio controls>
+                <source src="@@URL_REPLACE@@/>
+                Your browser does not support the audio element.
+                </audio>`);
+
+    }
+
+    processFiles(files, metadata){
+        let inputString = "";
+        let file  = files.find((f) => {
+            let ext = path.extname(f.originalname);
+            if (ext == ".txt") {
+                inputString = f.buffer.toString('utf8');
+                return true;
+            }else{
+                return false;
+            }
+        });
+        return [this.render(inputString), files]
+    }
+}
+
+export default GiftProcessor;