182 lines
5.8 KiB
C#
182 lines
5.8 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.DataAnnotations;
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using System.Globalization;
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using System.Net.Http;
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using System.Text;
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using System.Threading.Tasks;
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using System.Xml;
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namespace BlazorApp.Data
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{
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public class Event
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{
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public string Uid { get; set; }
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public string Summary { get; set; }
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public DateTime? DtStart { get; set; }
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public DateTime? DtEnd { get; set; }
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public string Description { get; set; }
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}
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public class Calendar
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{
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public int Id { get; set; }
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[Required] public string Url { get; set; }
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public string Username { get; set; }
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public string Password { get; set; }
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public string Name { get; set; }
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private string AuthorizationHeader =>
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$"Basic {Convert.ToBase64String(Encoding.UTF8.GetBytes($"{Username}:{Password}"))}";
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private static DateTime _parseDateTime(string s)
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{
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var format = s.Contains('T') ? "yyyyMMddTHHmmssK" : "yyyyMMdd";
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return DateTime.ParseExact(s, format, CultureInfo.InvariantCulture);
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}
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private static List<Event> ParseICal(string iCal)
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{
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Event @event = null;
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var events = new List<Event>();
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// Un-wrap all lines from the input
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var body = iCal
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.Replace("\n ", "")
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.Replace("\n\t", "")
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.Replace("\r", "");
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foreach (var line in body.Split("\n"))
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{
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var trimmed = line.Trim();
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var split = trimmed.Split(':', 2);
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if (split.Length != 2)
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continue;
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var left = split[0].Trim().Split(';');
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var name = left[0];
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// TODO Turn this into a regex
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var value = split[1]
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.Replace(@"\n", "\n")
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.Replace(@"\N", "\n")
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.Replace(@"\,", ",")
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.Replace(@"\;", ";")
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.Replace(@"\\", @"\");
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if (name == "BEGIN" && value == "VEVENT")
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{
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// Start of a new event
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@event = new Event();
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continue;
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}
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if (@event == null)
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{
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// Event hasn't started yet, ignore the property.
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continue;
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}
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switch (name)
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{
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case "END":
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if (value == "VEVENT")
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{
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// End of the current event, add it to the list
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events.Add(@event);
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@event = null;
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}
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break;
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case "UID":
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@event.Uid = value;
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break;
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case "SUMMARY":
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@event.Summary = value;
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break;
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case "DESCRIPTION":
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@event.Description = value;
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break;
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case "DTSTART":
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@event.DtStart = _parseDateTime(value);
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break;
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case "DTEND":
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@event.DtEnd = _parseDateTime(value);
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break;
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}
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}
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return events;
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}
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/**
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* <summary>Retrieves and parses all events from the CalDav server.</summary>
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*/
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public async Task<List<Event>> GetEvents()
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{
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var client = new HttpClient();
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client.DefaultRequestHeaders.Add("Authorization", AuthorizationHeader);
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var body = await client.GetStringAsync(Url);
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var events = ParseICal(body);
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events.Sort((x, y) =>
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{
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if (y.DtStart == null)
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return -1;
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if (x.DtStart == null)
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return 1;
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return DateTime.Compare(y.DtStart.Value, x.DtStart.Value);
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});
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return events;
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}
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/**
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* <summary>Retrieves and parses an event with UID <code>uid</code> from the CalDav server.</summary>
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*/
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public async Task<Event> GetEventByUid(string uid)
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{
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var client = new HttpClient();
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client.DefaultRequestHeaders.Add("Authorization", AuthorizationHeader);
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var request = new HttpRequestMessage(new HttpMethod("REPORT"), Url);
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request.Headers.Add("Depth", "1");
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// TODO Use XML generator to safely add UID - this is sensitive to scary injection stuff
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request.Content = new StringContent(@$"<?xml version=""1.0"" encoding=""utf-8"" ?>
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<C:calendar-query xmlns:C=""urn:ietf:params:xml:ns:caldav"">
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<D:prop xmlns:D=""DAV:"">
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<D:getetag/>
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<C:calendar-data/>
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</D:prop>
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<C:filter>
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<C:comp-filter name=""VCALENDAR"">
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<C:comp-filter name=""VEVENT"">
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<C:prop-filter name=""UID"">
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<C:text-match collation=""i;octet""
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>{uid}</C:text-match>
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</C:prop-filter>
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</C:comp-filter>
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</C:comp-filter>
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</C:filter>
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</C:calendar-query>
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", Encoding.UTF8, "application/xml");
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var result = await client.SendAsync(request);
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var body = await result.Content.ReadAsStreamAsync();
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var reader = new XmlTextReader(body);
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var document = new XmlDocument();
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document.Load(reader);
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var node = document.GetElementsByTagName("C:calendar-data")[0]?.InnerText;
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var events = ParseICal(node);
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return events.Count > 0 ? events[0] : null;
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}
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}
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}
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