♻️ Refactored webhook receiver in realtime call
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305
DysonNetwork.Sphere/Chat/Realtime/CloudflareService.cs
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305
DysonNetwork.Sphere/Chat/Realtime/CloudflareService.cs
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.Json;
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using Microsoft.IdentityModel.Tokens;
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using System.Text.Json.Serialization;
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using Microsoft.EntityFrameworkCore;
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using NodaTime;
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namespace DysonNetwork.Sphere.Chat.Realtime;
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public class CloudflareRealtimeService : IRealtimeService
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{
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private readonly AppDatabase _db;
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private readonly HttpClient _httpClient;
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private readonly IConfiguration _configuration;
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private RSA? _publicKey;
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public CloudflareRealtimeService(
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AppDatabase db,
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HttpClient httpClient,
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IConfiguration configuration
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)
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{
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_db = db;
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_httpClient = httpClient;
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_configuration = configuration;
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var apiKey = _configuration["Realtime:Cloudflare:ApiKey"];
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var apiSecret = _configuration["Realtime:Cloudflare:ApiSecret"]!;
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var credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes($"{apiKey}:{apiSecret}"));
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_httpClient.BaseAddress = new Uri("https://rtk.realtime.cloudflare.com/v2/");
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_httpClient.DefaultRequestHeaders.Authorization =
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new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", credentials);
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}
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public string ProviderName => "Cloudflare";
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public async Task<RealtimeSessionConfig> CreateSessionAsync(Guid roomId, Dictionary<string, object> metadata)
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{
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var roomName = $"Room Call #{roomId.ToString().Replace("-", "")}";
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var requestBody = new
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{
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title = roomName,
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preferred_region = _configuration["Realtime:Cloudflare:PreferredRegion"],
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data = metadata
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};
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var content = new StringContent(JsonSerializer.Serialize(requestBody), Encoding.UTF8, "application/json");
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var response = await _httpClient.PostAsync("meetings", content);
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response.EnsureSuccessStatusCode();
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var responseContent = await response.Content.ReadAsStringAsync();
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var meetingResponse = JsonSerializer.Deserialize<CfMeetingResponse>(responseContent);
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if (meetingResponse is null) throw new Exception("Failed to create meeting with cloudflare");
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return new RealtimeSessionConfig
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{
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SessionId = meetingResponse.Data.Id,
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Parameters = new Dictionary<string, object>
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{
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{ "meetingId", meetingResponse.Data.Id }
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}
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};
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}
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public async Task EndSessionAsync(string sessionId, RealtimeSessionConfig config)
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{
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var requestBody = new
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{
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status = "INACTIVE"
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};
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var content = new StringContent(JsonSerializer.Serialize(requestBody), Encoding.UTF8, "application/json");
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var response = await _httpClient.PatchAsync($"sessions/{sessionId}", content);
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response.EnsureSuccessStatusCode();
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}
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public string GetUserToken(Account.Account account, string sessionId, bool isAdmin = false)
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{
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return GetUserTokenAsync(account, sessionId, isAdmin).GetAwaiter().GetResult();
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}
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public async Task<string> GetUserTokenAsync(Account.Account account, string sessionId, bool isAdmin = false)
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{
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try
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{
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// First try to get the participant by their custom ID
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var participantCheckResponse = await _httpClient
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.GetAsync($"meetings/{sessionId}/participants/{account.Id}");
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if (participantCheckResponse.IsSuccessStatusCode)
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{
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// Participant exists, get a new token
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var tokenResponse = await _httpClient
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.PostAsync($"meetings/{sessionId}/participants/{account.Id}/token", null);
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tokenResponse.EnsureSuccessStatusCode();
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var tokenContent = await tokenResponse.Content.ReadAsStringAsync();
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var tokenData = JsonSerializer.Deserialize<CfResponse<CfTokenResponse>>(tokenContent);
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if (tokenData == null || !tokenData.Success)
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{
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throw new Exception("Failed to get participant token");
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}
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return tokenData.Data?.Token ?? throw new Exception("Token is null");
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}
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// Participant doesn't exist, create a new one
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var requestBody = new
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{
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name = "@" + account.Name,
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preset_name = isAdmin ? "group_call_host" : "group_call_participant",
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custom_user_id = account.Id.ToString()
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};
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var content = new StringContent(
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JsonSerializer.Serialize(requestBody),
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Encoding.UTF8,
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"application/json"
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);
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var createResponse = await _httpClient.PostAsync($"meetings/{sessionId}/participants", content);
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createResponse.EnsureSuccessStatusCode();
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var responseContent = await createResponse.Content.ReadAsStringAsync();
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var participantData = JsonSerializer.Deserialize<CfResponse<CfParticipantResponse>>(responseContent);
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if (participantData == null || !participantData.Success)
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{
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throw new Exception("Failed to create participant");
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}
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return participantData.Data?.Token ?? throw new Exception("Token is null");
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}
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catch (Exception ex)
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{
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// Log the error or handle it appropriately
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throw new Exception($"Failed to get or create participant: {ex.Message}", ex);
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}
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}
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public async Task ReceiveWebhook(string body, string authHeader)
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{
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if (string.IsNullOrEmpty(authHeader))
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{
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throw new ArgumentException("Auth header is missing");
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}
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if (_publicKey == null)
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{
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await GetPublicKeyAsync();
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}
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var signature = authHeader.Replace("Signature ", "");
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var bodyBytes = Encoding.UTF8.GetBytes(body);
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var signatureBytes = Convert.FromBase64String(signature);
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if (!(_publicKey?.VerifyData(bodyBytes, signatureBytes, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1) ??
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false))
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{
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throw new SecurityTokenException("Webhook signature validation failed");
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}
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// Process the webhook event
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var evt = JsonSerializer.Deserialize<CfWebhookEvent>(body);
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if (evt is null) return;
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switch (evt.Type)
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{
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case "meeting.ended":
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var now = SystemClock.Instance.GetCurrentInstant();
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await _db.ChatRealtimeCall
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.Where(c => c.SessionId == evt.Event.Meeting.Id)
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.ExecuteUpdateAsync(s => s.SetProperty(p => p.EndedAt, now)
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);
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break;
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}
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}
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private class WebhooksConfig
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{
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[JsonPropertyName("keys")] public List<WebhookKey> Keys { get; set; } = new List<WebhookKey>();
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}
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private class WebhookKey
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{
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[JsonPropertyName("publicKeyPem")] public string PublicKeyPem { get; set; } = string.Empty;
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}
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private async Task GetPublicKeyAsync()
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{
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var response = await _httpClient.GetAsync("https://rtk.realtime.cloudflare.com/.well-known/webhooks.json");
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response.EnsureSuccessStatusCode();
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var content = await response.Content.ReadAsStringAsync();
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var webhooksConfig = JsonSerializer.Deserialize<WebhooksConfig>(content);
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var publicKeyPem = webhooksConfig?.Keys.FirstOrDefault()?.PublicKeyPem;
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if (string.IsNullOrEmpty(publicKeyPem))
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{
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throw new InvalidOperationException("Public key not found in webhooks configuration.");
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}
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_publicKey = RSA.Create();
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_publicKey.ImportFromPem(publicKeyPem);
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}
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private class CfMeetingResponse
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{
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[JsonPropertyName("data")] public CfMeetingData Data { get; set; } = new();
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}
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private class CfMeetingData
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{
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[JsonPropertyName("id")] public string Id { get; set; } = string.Empty;
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[JsonPropertyName("roomName")] public string RoomName { get; set; } = string.Empty;
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[JsonPropertyName("title")] public string Title { get; set; } = string.Empty;
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[JsonPropertyName("status")] public string Status { get; set; } = string.Empty;
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[JsonPropertyName("createdAt")] public DateTime CreatedAt { get; set; }
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[JsonPropertyName("updatedAt")] public DateTime UpdatedAt { get; set; }
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}
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private class CfParticipant
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{
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public string Id { get; set; } = string.Empty;
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public string Token { get; set; } = string.Empty;
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public string CustomParticipantId { get; set; } = string.Empty;
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}
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public class CfResponse<T>
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{
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[JsonPropertyName("success")] public bool Success { get; set; }
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[JsonPropertyName("data")] public T? Data { get; set; }
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}
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public class CfTokenResponse
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{
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[JsonPropertyName("token")] public string Token { get; set; } = string.Empty;
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}
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public class CfParticipantResponse
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{
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[JsonPropertyName("id")] public string Id { get; set; } = string.Empty;
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[JsonPropertyName("name")] public string Name { get; set; } = string.Empty;
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[JsonPropertyName("customUserId")] public string CustomUserId { get; set; } = string.Empty;
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[JsonPropertyName("presetName")] public string PresetName { get; set; } = string.Empty;
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[JsonPropertyName("isActive")] public bool IsActive { get; set; }
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[JsonPropertyName("token")] public string Token { get; set; } = string.Empty;
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}
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public class CfWebhookEvent
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{
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[JsonPropertyName("id")] public string Id { get; set; }
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[JsonPropertyName("type")] public string Type { get; set; }
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[JsonPropertyName("webhookId")] public string WebhookId { get; set; }
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[JsonPropertyName("timestamp")] public DateTime Timestamp { get; set; }
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[JsonPropertyName("event")] public EventData Event { get; set; }
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}
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public class EventData
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{
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[JsonPropertyName("meeting")] public MeetingData Meeting { get; set; }
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[JsonPropertyName("participant")] public ParticipantData Participant { get; set; }
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}
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public class MeetingData
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{
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[JsonPropertyName("id")] public string Id { get; set; }
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[JsonPropertyName("roomName")] public string RoomName { get; set; }
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[JsonPropertyName("title")] public string Title { get; set; }
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[JsonPropertyName("status")] public string Status { get; set; }
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[JsonPropertyName("createdAt")] public DateTime CreatedAt { get; set; }
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[JsonPropertyName("updatedAt")] public DateTime UpdatedAt { get; set; }
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}
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public class ParticipantData
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{
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[JsonPropertyName("id")] public string Id { get; set; }
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[JsonPropertyName("userId")] public string UserId { get; set; }
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[JsonPropertyName("customParticipantId")]
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public string CustomParticipantId { get; set; }
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[JsonPropertyName("presetName")] public string PresetName { get; set; }
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[JsonPropertyName("joinedAt")] public DateTime JoinedAt { get; set; }
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[JsonPropertyName("leftAt")] public DateTime? LeftAt { get; set; }
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}
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}
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