init: initial commit

2026-04-22 07:08:01 +03:00 · 2025-11-18 20:16:48 +00:00
commit fe11e264de
69 changed files with 10008 additions and 0 deletions
@@ -0,0 +1,91 @@
+using AngleSharp.Html.Dom;
+using AngleSharp.Html.Parser;
+using BonchCalendar.Utils;
+
+namespace BonchCalendar.Services;
+
+public class ApiService
+{
+	public async Task<Dictionary<int, string>> GetFacultiesListAsync() =>
+		ParseListResponse(await SendRequestAsync(new()
+		{
+			["choice"] = "1",       // "choice" is always "1" (idk why, don't ask me)
+			["schet"] = GetCurrentSemesterId()
+		}));
+
+	public async Task<Dictionary<int, string>> GetGroupsListAsync(int facultyId, int course) =>
+		ParseListResponse(await SendRequestAsync(new()
+		{
+			["choice"] = "1",
+			["schet"] = GetCurrentSemesterId(),
+			["faculty"] = facultyId.ToString(), // Specifying faculty ID returns a list of groups
+			["kurs"] = course.ToString()        // Course number is actually optional, but filters out other groups. Can be set 0 to get all groups of the faculty.
+		}));
+
+	public async Task<string> GetScheduleDocumentAsync(int groupId, TimetableType timetableType) =>
+		await SendRequestAsync(new()
+		{
+			["schet"] = GetCurrentSemesterId(),
+			["type_z"] = ((int)timetableType).ToString(),
+			["group"] = groupId.ToString()
+		});
+
+	public async Task<DateTime> GetSemesterStartDateAsync(int groupId)
+	{
+		using HttpClient client = new();
+		string content = await client.GetStringAsync($"https://www.sut.ru/studentu/raspisanie/raspisanie-zanyatiy-studentov-ochnoy-i-vecherney-form-obucheniya?group={groupId}");
+
+		using IHtmlDocument doc = new HtmlParser().ParseDocument(content);
+		string labelText = doc.QuerySelector("a#rasp-prev + div:nth-child(2) > span")!.TextContent;
+		int weekNumber = int.Parse(ParserUtils.NumberRegex().Match(labelText).Value);
+		DateTime currentDate = DateTime.Today;
+		currentDate = currentDate
+			.AddDays(-(int)currentDate.DayOfWeek + 1) // Move to Monday
+			.AddDays(-7 * (weekNumber - 1));          // Move back to the first week
+
+		return currentDate;
+	}
+
+	private static Dictionary<int, string> ParseListResponse(string responseContent) =>
+		responseContent
+			.Split(';', StringSplitOptions.RemoveEmptyEntries)
+			.Select(item => item.Split(','))
+			.ToDictionary(
+				parts => int.Parse(parts[0]),
+				parts => parts[1]
+			);
+
+	public async Task<string> SendRequestAsync(Dictionary<string, string> formData)
+	{
+		HttpRequestMessage request = new(HttpMethod.Post, "https://cabinet.sut.ru/raspisanie_all_new.php")
+		{
+			Content = new FormUrlEncodedContent(formData)
+		};
+
+		using HttpClient client = new(new HttpClientHandler
+		{
+			// Sometimes Bonch being Bonch just doesn't renew its SSL certificates properly
+			ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => true
+		});
+
+		HttpResponseMessage response = await client.SendAsync(request);
+		response.EnsureSuccessStatusCode();
+
+		return await response.Content.ReadAsStringAsync();
+	}
+
+	private static string GetCurrentSemesterId()
+	{
+		DateTime now = DateTime.Today;
+		int currentSemester = now.Month is >= 8 or < 2
+			? 1         // August through January - first semester
+			: 2;        // Everything else - second
+
+		int termStartYear = now.Year - 2000;    // We need only last two digits (e.g. 25 for 2025)
+
+		if (now.Month < 8)      // Before August means we are in the second semester of the previous academic year
+			termStartYear--;
+
+		return $"205.{termStartYear}{termStartYear + 1}/{currentSemester}";
+	}
+}