move generic js into root

1 files changed, 73 insertions, 0 deletions

diff --git a/js/student-common.js b/js/student-common.js
new file mode 100644
index 0000000..930c373
--- /dev/null
+++ b/js/student-common.js
@@ -0,0 +1,73 @@
+import { getUserIconUrl, getCourseParticipantsUrl } from "./config.js";
+/**
+ * Class to represent Students.
+ */
+class Student {
+	constructor(id, name, groups) {
+		this.id = id;
+		this.name = name;
+		this.groups = groups;
+	}
+
+	async getIconUrl() {
+		return await getUserIconUrl(this.id);
+	}
+
+	getGroupName() {
+		return `g${this.id}${this.name.replace(' ', '')}`;
+	}
+}
+
+async function fetchStudent(idFilter, nameFilter, groupFilter) {
+	const students = await fetchStudents(idFilter, nameFilter, groupFilter);
+	return students[0];
+}
+
+// Cache the fetched students.
+let students = [];
+
+const idRegex = /id=(\d+)/;
+async function fetchStudents(idFilter, nameFilter, groupFilter) {
+	if (students.size) {
+		return students;
+	}
+
+	const res = await fetch(getCourseParticipantsUrl());
+	const doc = new DOMParser().parseFromString(await res.text(), "text/html");
+	const table = doc.querySelector("tbody");
+	table.querySelectorAll("tr").forEach(row => {
+		if (row.classList.contains("emptyrow"))
+			return;
+
+		const roleCell = row.querySelector(".c4");
+		// TODO(muhq): Is this locale dependent?
+		if (roleCell.innerHTML.includes("Lehrer")) {
+			return;
+		}
+
+		const nameCell = row.querySelector(".c1");
+		let name;
+		if (nameCell.firstChild.firstChild.tagName == "SPAN")
+			name = nameCell.firstChild.firstChild.title;
+		else
+			name = nameCell.innerText;
+
+		const profileUrl = nameCell.querySelector("a.aabtn").href;
+		const match = idRegex.exec(profileUrl);
+		const id = match[1];
+
+		const groupCell = row.querySelector(".c5");
+		const groupsText = groupCell.querySelector("a.quickeditlink").textContent;
+		const group = groupsText.trim();
+
+		if ((!idFilter || id === idFilter) &&
+			(!nameFilter || name.includes(nameFilter)) &&
+			(!groupFilter || groupFilter === group))
+		{
+			students.push(new Student(id, name, group));
+		}
+	});
+	return students;
+}
+
+export { Student, fetchStudents, fetchStudent };