From 945f3bdceffed7d3bb20ee1849f5f166b3c467bc Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fischer@muhq.space>
Date: Fri, 25 Sep 2026 20:19:08 +0200
Subject: utils: introduce course local storage helper class

---
 src/database-prod.ts |  6 +++---
 src/student-prod.ts  | 15 +++++++++++----
 src/utils-mock.js    | 10 ++++++++++
 src/utils-prod.js    | 10 ++++++++++
 4 files changed, 34 insertions(+), 7 deletions(-)

diff --git a/src/database-prod.ts b/src/database-prod.ts
index 6712adb..7f50a35 100644
--- a/src/database-prod.ts
+++ b/src/database-prod.ts
@@ -1,5 +1,5 @@
 import { assert } from "./assert.ts";
-import { getCourseId, getSesskey } from "./utils-ENV.js";
+import { getCourseId, CourseLocalStorage, getSesskey } from "./utils-ENV.js";
 
 const DB_TEMPLATE_LIST_HEADER = `
 <table class="table table-striped">
@@ -31,7 +31,7 @@ let graduationDb = findGraduationDb();
 const ID_QUERY_PARAM_REGEX = /[?&]id=(\d+)/;
 
 async function findGraduationDb() {
-	let graduationDbId = localStorage.getItem(`gruaduationDbId-${getCourseId()}`);
+	let graduationDbId = CourseLocalStorage.getItem("bycs-sol-gruaduationDbId");
 	if (graduationDbId !== null) {
 		return new DB(Number(graduationDbId));
 	}
@@ -46,7 +46,7 @@ async function findGraduationDb() {
 			const match = anchor.href.match(ID_QUERY_PARAM_REGEX);
 			if (match === null) continue;
 			const dbId = match[1];
-			localStorage.setItem("graduationDbId", dbId);
+			CourseLocalStorage.setItem("bycs-sol-graduationDbId", dbId);
 			return new DB(Number(dbId));
 		}
 	}
diff --git a/src/student-prod.ts b/src/student-prod.ts
index 1addf32..ea258c7 100644
--- a/src/student-prod.ts
+++ b/src/student-prod.ts
@@ -1,6 +1,11 @@
 import type { Graduation } from "./graduation-common.ts";
 import { Student } from "./student-common.ts";
-import { getCourseId, getUserIconUrl, getCourseParticipantsUrl } from "./utils-prod.js";
+import {
+	getCourseId,
+	CourseLocalStorage,
+	getUserIconUrl,
+	getCourseParticipantsUrl,
+} from "./utils-prod.js";
 import { fetchGraduation } from "./graduation-prod.ts";
 
 declare module "./student-common.ts" {
@@ -58,16 +63,18 @@ async function _fetchStudents() {
 async function fetchStudents(idFilter?: number, nameFilter?: string) {
 	if (students === null) {
 		const studentsPromise = _fetchStudents();
-		const storedStudents = localStorage.getItem(`students-${getCourseId()}`);
+		const storedStudents = CourseLocalStorage.getItem(`students-${getCourseId()}`);
 		if (storedStudents !== null && storedStudents.length > 0) {
-			studentsPromise.then((fetched) => localStorage.setItem("students", JSON.stringify(fetched)));
+			studentsPromise.then((fetched) =>
+				CourseLocalStorage.setItem("students", JSON.stringify(fetched)),
+			);
 			students = [];
 			for (const o of JSON.parse(storedStudents)) {
 				students.push(new Student(o.id, o.name));
 			}
 		} else {
 			students = await studentsPromise;
-			localStorage.setItem("students", JSON.stringify(students));
+			CourseLocalStorage.setItem("students", JSON.stringify(students));
 		}
 	}
 
diff --git a/src/utils-mock.js b/src/utils-mock.js
index 5457700..563f685 100644
--- a/src/utils-mock.js
+++ b/src/utils-mock.js
@@ -59,3 +59,13 @@ export function getCourseParticipantsUrl() {
 	console.error("Try to get mocked participations URL");
 	return "";
 }
+
+export class CourseLocalStorage {
+	static getItem(key) {
+		return localStorage.getItem(`${key}-mock`);
+	}
+
+	static setItem(key, val) {
+		return localStorage.setItem(`${key}-mock`, val);
+	}
+}
diff --git a/src/utils-prod.js b/src/utils-prod.js
index bc5868f..b53f535 100644
--- a/src/utils-prod.js
+++ b/src/utils-prod.js
@@ -62,3 +62,13 @@ export function getSesskey() {
 export function getCourseParticipantsUrl() {
 	return `https://lernplattform.bycs.de/user/index.php?id=${getCourseId()}&perpage=5000&tifirst&tilast`;
 }
+
+export class CourseLocalStorage {
+	static getItem(key) {
+		return localStorage.getItem(`${key}-${getCourseId()}`);
+	}
+
+	static setItem(key, val) {
+		return localStorage.setItem(`${key}-${getCourseId()}`, val);
+	}
+}
-- 
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