chore(backend): Aanpassingen Dwengo Learning-Object-Repository

Processing uit Dwengo Learning-Object-Repository geconverteerd naar TypeScript en aangepast aan onze app.

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/markdown/markdown-processor.ts

@@ -0,0 +1,46 @@
+/**
+ * Based on https://github.com/dwengovzw/Learning-Object-Repository/blob/main/app/processors/markdown/markdown_processor.js
+ * and https://github.com/dwengovzw/Learning-Object-Repository/blob/main/app/processors/markdown/learing_object_markdown_renderer.js [sic!]
+ */
+
+import {marked} from 'marked'
+import Processor from '../processor.js';
+import InlineImageProcessor from '../image/inline-image-processor.js';
+import {DwengoContentType} from "../content-type";
+import {ProcessingError} from "../processing-error";
+import dwengoMarkedRenderer from "./learning-object-markdown-renderer";
+
+class MarkdownProcessor extends Processor<string> {
+    constructor() {
+        super(DwengoContentType.TEXT_MARKDOWN);
+    }
+
+    override renderFn(mdText: string) {
+        let html = "";
+        try {
+            mdText = this.replaceLinks(mdText); // Replace html image links with path based on metadata
+            marked.use({renderer: dwengoMarkedRenderer});
+            html = marked(mdText, {async: false});
+        } catch (e: any) {
+            throw new ProcessingError(e.message);
+        }
+        return html;
+    }
+
+    replaceLinks(html: string) {
+        let proc = new InlineImageProcessor();
+        html = html.replace(/<img.*?src="(.*?)".*?(alt="(.*?)")?.*?(title="(.*?)")?.*?>/g, (
+            match: string,
+            src: string,
+            alt: string,
+            altText: string,
+            title: string,
+            titleText: string
+        ) => {
+            return proc.render(src);
+        });
+        return html;
+    }
+}
+
+export { MarkdownProcessor };