Webuntis stunden check

2026-09-08 23:59:07 +02:00
parent e86125e5f9
commit 2ec8adac61
7 changed files with 348 additions and 1 deletions
@@ -5,7 +5,7 @@ using System.Text.Json;

 namespace LehrerApp.WebUntis;

-public sealed class WebUntisClient : IAsyncDisposable
+public sealed partial class WebUntisClient : IAsyncDisposable
 {
    private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web);
    private static readonly UTF8Encoding StrictUtf8 = new(false, true);
@@ -0,0 +1,113 @@
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+using System.Text.Json;
+
+namespace LehrerApp.WebUntis;
+
+public sealed record UntisOpenElement(int Id, string Name)
+{
+    public override string ToString() => Name;
+}
+public sealed record UntisOpenPeriodsMeta(
+    IReadOnlyList<UntisOpenElement> Teachers, IReadOnlyList<UntisOpenElement> Classes,
+    IReadOnlyList<int> MyClassIds, DateOnly SchoolYearStart, DateOnly SchoolYearEnd,
+    int? OwnTeacherId);
+public sealed record UntisOpenPeriod(int Id, DateTime Start, DateTime End, int Hour,
+    string Classes, string Teachers, string Subject, bool TopicMissing, bool AttendanceMissing)
+{
+    public string When => $"{Start:dd.MM.yyyy} · {Hour}. Stunde · {Start:HH:mm}–{End:HH:mm}";
+    public string Missing => (TopicMissing, AttendanceMissing) switch
+    {
+        (true, true) => "Thema und Anwesenheitskontrolle fehlen",
+        (true, false) => "Thema fehlt",
+        (false, true) => "Anwesenheitskontrolle fehlt",
+        _ => "Von WebUntis als offen gemeldet"
+    };
+}
+
+public sealed partial class WebUntisClient
+{
+    private const string OpenPeriodsPath = "/WebUntis/api/rest/view/v1/classreg/open-periods";
+
+    public Task<UntisOpenPeriodsMeta> GetOpenPeriodsMetaAsync(int schoolYearId, CancellationToken token) =>
+        WithSessionAsync(async session =>
+        {
+            var json = await OpenPeriodsRequestAsync(session, schoolYearId, null, token);
+            var year = json.GetProperty("schoolYear");
+            return new UntisOpenPeriodsMeta(OpenElements(json.GetProperty("teachers")),
+                OpenElements(json.GetProperty("classes")),
+                json.GetProperty("myClassIds").EnumerateArray().Select(x => x.GetInt32()).ToArray(),
+                year.GetProperty("start").GetDateOnly(), year.GetProperty("end").GetDateOnly(),
+                _myTeacherUntisId);
+        }, token);
+
+    public Task<IReadOnlyList<UntisOpenPeriod>> GetOpenPeriodsAsync(int schoolYearId, int? teacherId,
+        int? classId, DateOnly start, DateOnly end, CancellationToken token)
+    {
+        if ((teacherId is null) == (classId is null) || teacherId is <= 0 || classId is <= 0)
+            throw new ArgumentException("Genau eine gültige Lehrer- oder Klassen-ID ist erforderlich.");
+        if (start > end) throw new ArgumentException("Der Beginn muss vor dem Ende liegen.");
+        var body = new Dictionary<string, object>
+        {
+            [teacherId.HasValue ? "teacherId" : "classId"] = teacherId ?? classId!.Value,
+            ["filter"] = "TOPIC_OR_ABSENCE_OPEN",
+            ["dateRange"] = new { start = start.ToString("yyyy-MM-dd"), end = end.ToString("yyyy-MM-dd") }
+        };
+        return WithSessionAsync(async session => ParseOpenPeriods(
+            await OpenPeriodsRequestAsync(session, schoolYearId, body, token)), token);
+    }
+
+    public static IReadOnlyList<UntisOpenPeriod> ParseOpenPeriods(JsonElement json) =>
+        json.GetProperty("periods").EnumerateArray().Select(row =>
+        {
+            var p = row.GetProperty("period");
+            var range = p.GetProperty("dtRange");
+            return new UntisOpenPeriod(p.GetProperty("id").GetInt32(),
+                range.GetProperty("start").GetDateTime(), range.GetProperty("end").GetDateTime(),
+                p.GetProperty("hr").GetInt32(),
+                string.Join(", ", OpenElements(p.GetProperty("classes")).Select(x => x.Name)),
+                string.Join(", ", OpenElements(p.GetProperty("teachers")).Select(x => x.Name)),
+                p.GetProperty("subject").GetProperty("el").GetProperty("name").GetString() ?? "",
+                row.GetProperty("topicNeeded").GetBoolean() &&
+                    string.IsNullOrWhiteSpace(row.GetProperty("topicShort").GetString()),
+                row.GetProperty("absCheckNeeded").GetBoolean() && !row.GetProperty("absChecked").GetBoolean());
+        }).OrderBy(x => x.Start).ToArray();
+
+    private static IReadOnlyList<UntisOpenElement> OpenElements(JsonElement array) => array.EnumerateArray()
+        .Select(x => x.GetProperty("el"))
+        .Select(x => new UntisOpenElement(x.GetProperty("id").GetInt32(),
+            x.GetProperty("nameShort").GetString() ?? x.GetProperty("name").GetString() ?? ""))
+        .ToArray();
+
+    private async Task<JsonElement> OpenPeriodsRequestAsync(string session, int schoolYearId,
+        object? body, CancellationToken token)
+    {
+        // The REST UI uses a bearer token issued for the existing WebUntis session.
+        using var tokenRequest = ReportRequest($"https://{GetConfiguration().Host}/WebUntis/api/token/new", session, true);
+        using var tokenResponse = await SendAsync(tokenRequest, TimeSpan.FromSeconds(20), token);
+        if (!tokenResponse.IsSuccessStatusCode)
+            throw new WebUntisException($"WebUntis-Token konnte nicht abgerufen werden: HTTP {(int)tokenResponse.StatusCode}.");
+        var bearer = (await tokenResponse.Content.ReadAsStringAsync(token)).Trim();
+        if (bearer.StartsWith('"')) bearer = JsonSerializer.Deserialize<string>(bearer) ?? "";
+        if (string.IsNullOrWhiteSpace(bearer) ||
+            bearer.Any(c => !char.IsAsciiLetterOrDigit(c) && c is not '-' and not '_' and not '.'))
+            throw new WebUntisException("WebUntis hat keinen gültigen Zugriffstoken geliefert.");
+        using var request = ReportRequest($"https://{GetConfiguration().Host}{OpenPeriodsPath}{(body is null ? "/meta" : "")}", session, true);
+        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", bearer);
+        request.Headers.Add("x-webuntis-api-school-year-id", schoolYearId.ToString());
+        if (body is not null)
+        {
+            request.Method = HttpMethod.Post;
+            request.Content = JsonContent.Create(body, options: JsonOptions);
+        }
+        using var response = await SendAsync(request, TimeSpan.FromSeconds(30), token);
+        if (!response.IsSuccessStatusCode)
+            throw new WebUntisException($"Offene Stunden konnten nicht abgerufen werden: HTTP {(int)response.StatusCode}.");
+        return await ReadJsonAsync(response, token);
+    }
+}
+
+internal static class OpenPeriodJsonDates
+{
+    public static DateOnly GetDateOnly(this JsonElement value) => DateOnly.ParseExact(value.GetString()!, "yyyy-MM-dd");
+}