Added approach to allow versioning of PDFs (Requires env var!)

src/pages/api/assignments/[id]/export.tsx

@@ -106,18 +106,20 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
 			results: any;
 			exams: {module: Module}[];
 			startDate: string;
-			pdf?: string;
+			pdf: {
+				path: string,
+				version: string,
+			},
 		};
 		if (!data) {
 			res.status(400).end();
 			return;
 		}
 
-		if (data.pdf) {
+		if (data.pdf && data.pdf.path && data.pdf.version === process.env.PDF_VERSION) {
 			// if it does, return the pdf url
-			const fileRef = ref(storage, data.pdf);
+			const fileRef = ref(storage, data.pdf.path);
 			const url = await getDownloadURL(fileRef);
-
 			res.status(200).end(url);
 			return;
 		}
@@ -387,7 +389,10 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
 
 				// update the stats entries with the pdf url to prevent duplication
 				await updateDoc(docSnap.ref, {
-					pdf: refName,
+					pdf: {
+						path: refName,
+						version: process.env.PDF_VERSION,
+					},
 				});
 				const url = await getDownloadURL(fileRef);
 				res.status(200).end(url);
@@ -419,8 +424,8 @@ async function get(req: NextApiRequest, res: NextApiResponse) {
 			return;
 		}
 
-		if (data.pdf) {
-			const fileRef = ref(storage, data.pdf);
+		if (data.pdf?.path) {
+			const fileRef = ref(storage, data.pdf.path);
 			const url = await getDownloadURL(fileRef);
 			return res.redirect(url);
 		}