db: find student databases and use them

1 files changed, 43 insertions, 1 deletions

diff --git a/js/database.js b/js/database.js
index 673011f..627acbe 100644
--- a/js/database.js
+++ b/js/database.js
@@ -19,6 +19,28 @@ const DB_TEMPLATE_LIST_FOOTER = `
 </table>
 `;
 
+let studentDbs = null;
+
+async function populateStudentDbs() {
+	const courseUrl = `https://lernplattform.bycs.de/course/view.php?id=${getCourseId()}`;
+	const courseRes = await fetch(courseUrl);
+	const courseDoc = new DOMParser().parseFromString(await courseRes.text(), 'text/html');
+
+	studentDbs = new Map();
+	for (const link of courseDoc.querySelectorAll("div.activityname > a.aalink")) {
+		const match = link.textContent.match(/(\d+)(Shadow|Public|Submit)/);
+		const studentId = match[1];
+		const dbType = match[2];
+		const dbId = link.href.match(/[?&]id=(\d+)/)[1]
+
+		if (!studentDbs.has(studentId)) {
+			studentDbs.set(studentId, {});
+		}
+
+		studentDbs.get(studentId)[dbType.lower()] = new DB(dbId);
+	}
+}
+
 class DB {
 	constructor(id) {
 		this.id = id;
@@ -31,6 +53,12 @@ class DB {
 	async saveEntry(json) {
 		return addEntryToDatabaseActivity(this.id, json);
 	}
+
+	static async getStudentDbs(student) {
+		if (!studentDbs)
+			await populateStudentDbs();
+		return studentDbs[student.id];
+	}
 }
 
 async function loadFromDatabaseActivity(id, params) {
@@ -58,6 +86,11 @@ async function loadFromDatabaseActivity(id, params) {
 	return data;
 }
 
+async function loadFromStudentDatabase(student, type) {
+	const db = await DB.getStudentDbs(student)[type];
+	return await db.fetchEntries()
+}
+
 async function addEntryToDatabaseActivity(id, json) {
 	const url = `/mod/data/edit.php?id=${id}`;
 	const editRes = await fetch(url);
@@ -82,4 +115,13 @@ async function addEntryToDatabaseActivity(id, json) {
 	});
 }
 
-export { DB, loadFromDatabaseActivity, addEntryToDatabaseActivity };
+async function addEntryToStudentDatabase(student, type, json) {
+	const db = await DB.getStudentDbs(student)[type];
+	await db.saveEntry(json);
+}
+
+export {
+	DB,
+	loadFromDatabaseActivity, loadFromStudentDatabase,
+	addEntryToDatabaseActivity, addEntryToStudentDatabase,
+};