push notification relay service and relay send api

src/Api/Controllers/PushController.cs

@@ -15,12 +15,14 @@ namespace Bit.Api.Controllers
     public class PushController : Controller
     {
         private readonly IPushRegistrationService _pushRegistrationService;
+        private readonly IPushNotificationService _pushNotificationService;
         private readonly IHostingEnvironment _environment;
         private readonly CurrentContext _currentContext;
         private readonly GlobalSettings _globalSettings;
 
         public PushController(
             IPushRegistrationService pushRegistrationService,
+            IPushNotificationService pushNotificationService,
             IHostingEnvironment environment,
             CurrentContext currentContext,
             GlobalSettings globalSettings)
@@ -28,6 +30,7 @@ namespace Bit.Api.Controllers
             _currentContext = currentContext;
             _environment = environment;
             _pushRegistrationService = pushRegistrationService;
+            _pushNotificationService = pushNotificationService;
             _globalSettings = globalSettings;
         }
 
@@ -62,8 +65,30 @@ namespace Bit.Api.Controllers
                 model.DeviceIds.Select(d => Prefix(d)), Prefix(model.OrganizationId));
         }
 
+        [HttpPost("send")]
+        public async Task PostSend(PushSendRequestModel model)
+        {
+            CheckUsage();
+
+            if(!string.IsNullOrWhiteSpace(model.UserId))
+            {
+                await _pushNotificationService.SendPayloadToUserAsync(Prefix(model.OrganizationId),
+                       model.Type.Value, model.Payload, Prefix(model.Identifier));
+            }
+            else if(!string.IsNullOrWhiteSpace(model.OrganizationId))
+            {
+                await _pushNotificationService.SendPayloadToOrganizationAsync(Prefix(model.OrganizationId),
+                    model.Type.Value, model.Payload, Prefix(model.Identifier));
+            }
+        }
+
         private string Prefix(string value)
         {
+            if(string.IsNullOrWhiteSpace(value))
+            {
+                return null;
+            }
+
             return $"{_currentContext.InstallationId.Value}_{value}";
         }
 

src/Core/Models/Api/Request/PushSendRequestModel.cs

@@ -0,0 +1,25 @@
+using Bit.Core.Enums;
+using System.ComponentModel.DataAnnotations;
+using System.Collections.Generic;
+
+namespace Bit.Core.Models.Api
+{
+    public class PushSendRequestModel : IValidatableObject
+    {
+        public string UserId { get; set; }
+        public string OrganizationId { get; set; }
+        public string Identifier { get; set; }
+        [Required]
+        public PushType? Type { get; set; }
+        [Required]
+        public object Payload { get; set; }
+
+        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
+        {
+            if(string.IsNullOrWhiteSpace(UserId) && string.IsNullOrWhiteSpace(OrganizationId))
+            {
+                yield return new ValidationResult($"{nameof(UserId)} or {nameof(OrganizationId)} is required.");
+            }
+        }
+    }
+}

src/Core/Services/IPushNotificationService.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Threading.Tasks;
 using Bit.Core.Models.Table;
+using Bit.Core.Enums;
 
 namespace Bit.Core.Services
 {
@@ -16,5 +17,7 @@ namespace Bit.Core.Services
         Task PushSyncVaultAsync(Guid userId);
         Task PushSyncOrgKeysAsync(Guid userId);
         Task PushSyncSettingsAsync(Guid userId);
+        Task SendPayloadToUserAsync(string userId, PushType type, object payload, string identifier);
+        Task SendPayloadToOrganizationAsync(string orgId, PushType type, object payload, string identifier);
     }
 }

src/Core/Services/Implementations/BaseRelayPushNotificationService.cs

@@ -0,0 +1,138 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using System.Net.Http;
+using Newtonsoft.Json;
+using System.Text;
+using System;
+using Newtonsoft.Json.Linq;
+using Bit.Core.Utilities;
+using System.Net;
+
+namespace Bit.Core.Services
+{
+    public abstract class BaseRelayPushNotificationService
+    {
+        private dynamic _decodedToken;
+        private DateTime? _nextAuthAttempt = null;
+
+        public BaseRelayPushNotificationService(
+            GlobalSettings globalSettings)
+        {
+            GlobalSettings = globalSettings;
+
+            PushClient = new HttpClient
+            {
+                BaseAddress = new Uri(globalSettings.PushRelayBaseUri)
+            };
+
+            IdentityClient = new HttpClient
+            {
+                BaseAddress = new Uri(globalSettings.Installation.IdentityUri)
+            };
+        }
+
+        protected HttpClient PushClient { get; private set; }
+        protected HttpClient IdentityClient { get; private set; }
+        protected GlobalSettings GlobalSettings { get; private set; }
+        protected string AccessToken { get; private set; }
+
+        protected async Task<bool> HandleTokenStateAsync()
+        {
+            if(_nextAuthAttempt.HasValue && DateTime.UtcNow > _nextAuthAttempt.Value)
+            {
+                return false;
+            }
+            _nextAuthAttempt = null;
+
+            if(!string.IsNullOrWhiteSpace(AccessToken) && !TokenExpired())
+            {
+                return true;
+            }
+
+            var requestMessage = new HttpRequestMessage
+            {
+                Method = HttpMethod.Post,
+                RequestUri = new Uri(IdentityClient.BaseAddress, "connect/token"),
+                Content = new FormUrlEncodedContent(new Dictionary<string, string>
+                {
+                    { "grant_type", "client_credentials" },
+                    { "scope", "api.push" },
+                    { "client_id", $"installation.{GlobalSettings.Installation.Id}" },
+                    { "client_secret", $"{GlobalSettings.Installation.Key}" }
+                })
+            };
+
+            var response = await IdentityClient.SendAsync(requestMessage);
+            if(!response.IsSuccessStatusCode)
+            {
+                if(response.StatusCode == HttpStatusCode.BadRequest)
+                {
+                    _nextAuthAttempt = DateTime.UtcNow.AddDays(1);
+                }
+
+                return false;
+            }
+
+            var responseContent = await response.Content.ReadAsStringAsync();
+            dynamic tokenResponse = JsonConvert.DeserializeObject(responseContent);
+            AccessToken = (string)tokenResponse.access_token;
+            return true;
+        }
+
+        protected class TokenHttpRequestMessage : HttpRequestMessage
+        {
+            public TokenHttpRequestMessage(string token)
+            {
+                Headers.Add("Authorization", $"Bearer {token}");
+            }
+
+            public TokenHttpRequestMessage(object requestObject, string token)
+                : this(token)
+            {
+                var stringContent = JsonConvert.SerializeObject(requestObject);
+                Content = new StringContent(stringContent, Encoding.UTF8, "application/json");
+            }
+        }
+
+        protected bool TokenExpired()
+        {
+            var decoded = DecodeToken();
+            var exp = decoded?["exp"];
+            if(exp == null)
+            {
+                throw new InvalidOperationException("No exp in token.");
+            }
+
+            var expiration = CoreHelpers.FromEpocMilliseconds(1000 * exp.Value<long>());
+            return DateTime.UtcNow < expiration;
+        }
+
+        protected JObject DecodeToken()
+        {
+            if(_decodedToken != null)
+            {
+                return _decodedToken;
+            }
+
+            if(AccessToken == null)
+            {
+                throw new InvalidOperationException($"{nameof(AccessToken)} not found.");
+            }
+
+            var parts = AccessToken.Split('.');
+            if(parts.Length != 3)
+            {
+                throw new InvalidOperationException($"{nameof(AccessToken)} must have 3 parts");
+            }
+
+            var decodedBytes = CoreHelpers.Base64UrlDecode(parts[1]);
+            if(decodedBytes == null || decodedBytes.Length < 1)
+            {
+                throw new InvalidOperationException($"{nameof(AccessToken)} must have 3 parts");
+            }
+
+            _decodedToken = JObject.Parse(Encoding.UTF8.GetString(decodedBytes, 0, decodedBytes.Length));
+            return _decodedToken;
+        }
+    }
+}

src/Core/Services/Implementations/NotificationHubPushNotificationService.cs

@@ -126,26 +126,43 @@ namespace Bit.Core.Services
 
         private async Task SendPayloadToUserAsync(Guid userId, PushType type, object payload, bool excludeCurrentContext)
         {
-            var tag = BuildTag($"template:payload_userId:{userId}", excludeCurrentContext);
-            await SendPayloadAsync(tag, type, payload);
+            await SendPayloadToUserAsync(userId.ToString(), type, payload, GetContextIdentifier(excludeCurrentContext));
         }
 
         private async Task SendPayloadToOrganizationAsync(Guid orgId, PushType type, object payload, bool excludeCurrentContext)
         {
-            var tag = BuildTag($"template:payload && organizationId:{orgId}", excludeCurrentContext);
+            await SendPayloadToUserAsync(orgId.ToString(), type, payload, GetContextIdentifier(excludeCurrentContext));
+        }
+
+        public async Task SendPayloadToUserAsync(string userId, PushType type, object payload, string identifier)
+        {
+            var tag = BuildTag($"template:payload_userId:{userId}", identifier);
             await SendPayloadAsync(tag, type, payload);
         }
 
-        private string BuildTag(string tag, bool excludeCurrentContext)
+        public async Task SendPayloadToOrganizationAsync(string orgId, PushType type, object payload, string identifier)
         {
-            if(excludeCurrentContext)
+            var tag = BuildTag($"template:payload && organizationId:{orgId}", identifier);
+            await SendPayloadAsync(tag, type, payload);
+        }
+
+        private string GetContextIdentifier(bool excludeCurrentContext)
+        {
+            if(!excludeCurrentContext)
             {
-                var currentContext = _httpContextAccessor?.HttpContext?.
+                return null;
+            }
+
+            var currentContext = _httpContextAccessor?.HttpContext?.
                 RequestServices.GetService(typeof(CurrentContext)) as CurrentContext;
-                if(!string.IsNullOrWhiteSpace(currentContext?.DeviceIdentifier))
-                {
-                    tag += $" && !deviceIdentifier:{currentContext.DeviceIdentifier}";
-                }
+            return currentContext?.DeviceIdentifier;
+        }
+
+        private string BuildTag(string tag, string identifier)
+        {
+            if(!string.IsNullOrWhiteSpace(identifier))
+            {
+                tag += $" && !deviceIdentifier:{identifier}";
             }
 
             return $"({tag})";

src/Core/Services/Implementations/RelayPushNotificationService.cs

@@ -0,0 +1,193 @@
+using System;
+using System.Threading.Tasks;
+using Bit.Core.Models.Table;
+using Bit.Core.Enums;
+using Microsoft.AspNetCore.Http;
+using Bit.Core.Models;
+using System.Net.Http;
+using Bit.Core.Models.Api;
+
+namespace Bit.Core.Services
+{
+    public class RelayPushNotificationService : BaseRelayPushNotificationService, IPushNotificationService
+    {
+        private readonly HttpClient _client;
+        private readonly IHttpContextAccessor _httpContextAccessor;
+
+        public RelayPushNotificationService(
+            GlobalSettings globalSettings,
+            IHttpContextAccessor httpContextAccessor)
+            : base(globalSettings)
+        {
+            _httpContextAccessor = httpContextAccessor;
+        }
+
+        public async Task PushSyncCipherCreateAsync(Cipher cipher)
+        {
+            await PushCipherAsync(cipher, PushType.SyncCipherCreate);
+        }
+
+        public async Task PushSyncCipherUpdateAsync(Cipher cipher)
+        {
+            await PushCipherAsync(cipher, PushType.SyncCipherUpdate);
+        }
+
+        public async Task PushSyncCipherDeleteAsync(Cipher cipher)
+        {
+            await PushCipherAsync(cipher, PushType.SyncLoginDelete);
+        }
+
+        private async Task PushCipherAsync(Cipher cipher, PushType type)
+        {
+            if(cipher.OrganizationId.HasValue)
+            {
+                // We cannot send org pushes since access logic is much more complicated than just the fact that they belong
+                // to the organization. Potentially we could blindly send to just users that have the access all permission
+                // device registration needs to be more granular to handle that appropriately. A more brute force approach could
+                // me to send "full sync" push to all org users, but that has the potential to DDOS the API in bursts.
+
+                // await SendPayloadToOrganizationAsync(cipher.OrganizationId.Value, type, message, true);
+            }
+            else if(cipher.UserId.HasValue)
+            {
+                var message = new SyncCipherPushNotification
+                {
+                    Id = cipher.Id,
+                    UserId = cipher.UserId,
+                    OrganizationId = cipher.OrganizationId,
+                    RevisionDate = cipher.RevisionDate,
+                };
+
+                await SendPayloadToUserAsync(cipher.UserId.Value, type, message, true);
+            }
+        }
+
+        public async Task PushSyncFolderCreateAsync(Folder folder)
+        {
+            await PushFolderAsync(folder, PushType.SyncFolderCreate);
+        }
+
+        public async Task PushSyncFolderUpdateAsync(Folder folder)
+        {
+            await PushFolderAsync(folder, PushType.SyncFolderUpdate);
+        }
+
+        public async Task PushSyncFolderDeleteAsync(Folder folder)
+        {
+            await PushFolderAsync(folder, PushType.SyncFolderDelete);
+        }
+
+        private async Task PushFolderAsync(Folder folder, PushType type)
+        {
+            var message = new SyncFolderPushNotification
+            {
+                Id = folder.Id,
+                UserId = folder.UserId,
+                RevisionDate = folder.RevisionDate
+            };
+
+            await SendPayloadToUserAsync(folder.UserId, type, message, true);
+        }
+
+        public async Task PushSyncCiphersAsync(Guid userId)
+        {
+            await PushSyncUserAsync(userId, PushType.SyncCiphers);
+        }
+
+        public async Task PushSyncVaultAsync(Guid userId)
+        {
+            await PushSyncUserAsync(userId, PushType.SyncVault);
+        }
+
+        public async Task PushSyncOrgKeysAsync(Guid userId)
+        {
+            await PushSyncUserAsync(userId, PushType.SyncOrgKeys);
+        }
+
+        public async Task PushSyncSettingsAsync(Guid userId)
+        {
+            await PushSyncUserAsync(userId, PushType.SyncSettings);
+        }
+
+        private async Task PushSyncUserAsync(Guid userId, PushType type)
+        {
+            var message = new SyncUserPushNotification
+            {
+                UserId = userId,
+                Date = DateTime.UtcNow
+            };
+
+            await SendPayloadToUserAsync(userId, type, message, false);
+        }
+
+        private async Task SendPayloadToUserAsync(Guid userId, PushType type, object payload, bool excludeCurrentContext)
+        {
+            var request = new PushSendRequestModel
+            {
+                UserId = userId.ToString(),
+                Type = type,
+                Payload = payload
+            };
+
+            if(excludeCurrentContext)
+            {
+                ExcludeCurrentContext(request);
+            }
+
+            await SendAsync(request);
+        }
+
+        private async Task SendPayloadToOrganizationAsync(Guid orgId, PushType type, object payload, bool excludeCurrentContext)
+        {
+            var request = new PushSendRequestModel
+            {
+                OrganizationId = orgId.ToString(),
+                Type = type,
+                Payload = payload
+            };
+
+            if(excludeCurrentContext)
+            {
+                ExcludeCurrentContext(request);
+            }
+
+            await SendAsync(request);
+        }
+
+        private async Task SendAsync(PushSendRequestModel requestModel)
+        {
+            var tokenStateResponse = await HandleTokenStateAsync();
+            if(!tokenStateResponse)
+            {
+                return;
+            }
+
+            var message = new TokenHttpRequestMessage(requestModel, AccessToken)
+            {
+                Method = HttpMethod.Post,
+                RequestUri = new Uri(PushClient.BaseAddress, "send")
+            };
+            await PushClient.SendAsync(message);
+        }
+
+        private void ExcludeCurrentContext(PushSendRequestModel request)
+        {
+            var currentContext = _httpContextAccessor?.HttpContext?.
+            RequestServices.GetService(typeof(CurrentContext)) as CurrentContext;
+            if(!string.IsNullOrWhiteSpace(currentContext?.DeviceIdentifier))
+            {
+                request.Identifier = currentContext.DeviceIdentifier;
+            }
+        }
+
+        public Task SendPayloadToUserAsync(string userId, PushType type, object payload, string identifier)
+        {
+            throw new NotImplementedException();
+        }
+
+        public Task SendPayloadToOrganizationAsync(string orgId, PushType type, object payload, string identifier)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

src/Core/Services/Implementations/RelayPushRegistrationService.cs

@@ -1,42 +1,21 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using System.Net.Http;
-using Newtonsoft.Json;
-using System.Text;
 using System;
-using Newtonsoft.Json.Linq;
-using Bit.Core.Utilities;
-using System.Net;
 using Bit.Core.Models.Api;
 using Bit.Core.Enums;
 using System.Linq;
 
 namespace Bit.Core.Services
 {
-    public class RelayPushRegistrationService : IPushRegistrationService
+    public class RelayPushRegistrationService : BaseRelayPushNotificationService, IPushRegistrationService
     {
-        private readonly HttpClient _pushClient;
-        private readonly HttpClient _identityClient;
-        private readonly GlobalSettings _globalSettings;
-        private string _accessToken;
         private dynamic _decodedToken;
         private DateTime? _nextAuthAttempt = null;
 
-        public RelayPushRegistrationService(
-            GlobalSettings globalSettings)
-        {
-            _globalSettings = globalSettings;
-
-            _pushClient = new HttpClient
-            {
-                BaseAddress = new Uri(globalSettings.PushRelayBaseUri)
-            };
-
-            _identityClient = new HttpClient
-            {
-                BaseAddress = new Uri(globalSettings.Installation.IdentityUri)
-            };
-        }
+        public RelayPushRegistrationService(GlobalSettings globalSettings)
+            : base(globalSettings)
+        { }
 
         public async Task CreateOrUpdateRegistrationAsync(string pushToken, string deviceId, string userId,
             string identifier, DeviceType type)
@@ -56,12 +35,12 @@ namespace Bit.Core.Services
                 UserId = userId
             };
 
-            var message = new TokenHttpRequestMessage(requestModel, _accessToken)
+            var message = new TokenHttpRequestMessage(requestModel, AccessToken)
             {
                 Method = HttpMethod.Post,
-                RequestUri = new Uri(_pushClient.BaseAddress, "register")
+                RequestUri = new Uri(PushClient.BaseAddress, "register")
             };
-            await _pushClient.SendAsync(message);
+            await PushClient.SendAsync(message);
         }
 
         public async Task DeleteRegistrationAsync(string deviceId)
@@ -72,12 +51,12 @@ namespace Bit.Core.Services
                 return;
             }
 
-            var message = new TokenHttpRequestMessage(_accessToken)
+            var message = new TokenHttpRequestMessage(AccessToken)
             {
                 Method = HttpMethod.Delete,
-                RequestUri = new Uri(_pushClient.BaseAddress, deviceId)
+                RequestUri = new Uri(PushClient.BaseAddress, deviceId)
             };
-            await _pushClient.SendAsync(message);
+            await PushClient.SendAsync(message);
         }
 
         public async Task AddUserRegistrationOrganizationAsync(IEnumerable<string> deviceIds, string organizationId)
@@ -94,12 +73,12 @@ namespace Bit.Core.Services
             }
 
             var requestModel = new PushUpdateRequestModel(deviceIds, organizationId);
-            var message = new TokenHttpRequestMessage(requestModel, _accessToken)
+            var message = new TokenHttpRequestMessage(requestModel, AccessToken)
             {
                 Method = HttpMethod.Put,
-                RequestUri = new Uri(_pushClient.BaseAddress, "add-organization")
+                RequestUri = new Uri(PushClient.BaseAddress, "add-organization")
             };
-            await _pushClient.SendAsync(message);
+            await PushClient.SendAsync(message);
         }
 
         public async Task DeleteUserRegistrationOrganizationAsync(IEnumerable<string> deviceIds, string organizationId)
@@ -116,138 +95,12 @@ namespace Bit.Core.Services
             }
 
             var requestModel = new PushUpdateRequestModel(deviceIds, organizationId);
-            var message = new TokenHttpRequestMessage(requestModel, _accessToken)
+            var message = new TokenHttpRequestMessage(requestModel, AccessToken)
             {
                 Method = HttpMethod.Put,
-                RequestUri = new Uri(_pushClient.BaseAddress, "delete-organization")
+                RequestUri = new Uri(PushClient.BaseAddress, "delete-organization")
             };
-            await _pushClient.SendAsync(message);
-        }
-
-        private async Task<bool> HandleTokenStateAsync()
-        {
-            if(_nextAuthAttempt.HasValue && DateTime.UtcNow > _nextAuthAttempt.Value)
-            {
-                return false;
-            }
-            _nextAuthAttempt = null;
-
-            if(!string.IsNullOrWhiteSpace(_accessToken) && !TokenExpired())
-            {
-                return true;
-            }
-
-            var requestMessage = new HttpRequestMessage
-            {
-                Method = HttpMethod.Post,
-                RequestUri = new Uri(_identityClient.BaseAddress, "connect/token"),
-                Content = new FormUrlEncodedContent(new Dictionary<string, string>
-                {
-                    { "grant_type", "client_credentials" },
-                    { "scope", "api.push" },
-                    { "client_id", $"installation.{_globalSettings.Installation.Id}" },
-                    { "client_secret", $"{_globalSettings.Installation.Key}" }
-                })
-            };
-
-            var response = await _identityClient.SendAsync(requestMessage);
-            if(!response.IsSuccessStatusCode)
-            {
-                if(response.StatusCode == HttpStatusCode.BadRequest)
-                {
-                    _nextAuthAttempt = DateTime.UtcNow.AddDays(1);
-                }
-
-                return false;
-            }
-
-            var responseContent = await response.Content.ReadAsStringAsync();
-            dynamic tokenResponse = JsonConvert.DeserializeObject(responseContent);
-            _accessToken = (string)tokenResponse.access_token;
-            return true;
-        }
-
-        public class TokenHttpRequestMessage : HttpRequestMessage
-        {
-            public TokenHttpRequestMessage(string token)
-            {
-                Headers.Add("Authorization", $"Bearer {token}");
-            }
-
-            public TokenHttpRequestMessage(object requestObject, string token)
-                : this(token)
-            {
-                var stringContent = JsonConvert.SerializeObject(requestObject);
-                Content = new StringContent(stringContent, Encoding.UTF8, "application/json");
-            }
-        }
-
-        public bool TokenExpired()
-        {
-            var decoded = DecodeToken();
-            var exp = decoded?["exp"];
-            if(exp == null)
-            {
-                throw new InvalidOperationException("No exp in token.");
-            }
-
-            var expiration = CoreHelpers.FromEpocMilliseconds(1000 * exp.Value<long>());
-            return DateTime.UtcNow < expiration;
-        }
-
-        private JObject DecodeToken()
-        {
-            if(_decodedToken != null)
-            {
-                return _decodedToken;
-            }
-
-            if(_accessToken == null)
-            {
-                throw new InvalidOperationException($"{nameof(_accessToken)} not found.");
-            }
-
-            var parts = _accessToken.Split('.');
-            if(parts.Length != 3)
-            {
-                throw new InvalidOperationException($"{nameof(_accessToken)} must have 3 parts");
-            }
-
-            var decodedBytes = Base64UrlDecode(parts[1]);
-            if(decodedBytes == null || decodedBytes.Length < 1)
-            {
-                throw new InvalidOperationException($"{nameof(_accessToken)} must have 3 parts");
-            }
-
-            _decodedToken = JObject.Parse(Encoding.UTF8.GetString(decodedBytes, 0, decodedBytes.Length));
-            return _decodedToken;
-        }
-
-        private byte[] Base64UrlDecode(string input)
-        {
-            var output = input;
-            // 62nd char of encoding
-            output = output.Replace('-', '+');
-            // 63rd char of encoding
-            output = output.Replace('_', '/');
-            // Pad with trailing '='s
-            switch(output.Length % 4)
-            {
-                case 0:
-                    // No pad chars in this case
-                    break;
-                case 2:
-                    // Two pad chars
-                    output += "=="; break;
-                case 3:
-                    // One pad char
-                    output += "="; break;
-                default:
-                    throw new InvalidOperationException("Illegal base64url string!");
-            }
-
-            // Standard base64 decoder
-            return Convert.FromBase64String(output);
+            await PushClient.SendAsync(message);
         }
     }
 }

src/Core/Services/NoopImplementations/NoopPushNotificationService.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Threading.Tasks;
+using Bit.Core.Enums;
 using Bit.Core.Models.Table;
 
 namespace Bit.Core.Services
@@ -55,5 +56,15 @@ namespace Bit.Core.Services
         {
             return Task.FromResult(0);
         }
+
+        public Task SendPayloadToOrganizationAsync(string orgId, PushType type, object payload, string identifier)
+        {
+            return Task.FromResult(0);
+        }
+
+        public Task SendPayloadToUserAsync(string userId, PushType type, object payload, string identifier)
+        {
+            return Task.FromResult(0);
+        }
     }
 }

src/Core/Utilities/CoreHelpers.cs

@@ -289,5 +289,41 @@ namespace Bit.Core.Utilities
 
             return true;
         }
+
+        public static string Base64UrlEncode(byte[] input)
+        {
+            var output = Convert.ToBase64String(input)
+                .Replace('+', '-')
+                .Replace('/', '_')
+                .Replace("=", string.Empty);
+            return output;
+        }
+
+        public static byte[] Base64UrlDecode(string input)
+        {
+            var output = input;
+            // 62nd char of encoding
+            output = output.Replace('-', '+');
+            // 63rd char of encoding
+            output = output.Replace('_', '/');
+            // Pad with trailing '='s
+            switch(output.Length % 4)
+            {
+                case 0:
+                    // No pad chars in this case
+                    break;
+                case 2:
+                    // Two pad chars
+                    output += "=="; break;
+                case 3:
+                    // One pad char
+                    output += "="; break;
+                default:
+                    throw new InvalidOperationException("Illegal base64url string!");
+            }
+
+            // Standard base64 decoder
+            return Convert.FromBase64String(output);
+        }
     }
 }

src/Core/Utilities/ServiceCollectionExtensions.cs

@@ -71,21 +71,26 @@ namespace Bit.Core.Utilities
                 services.AddSingleton<IMailDeliveryService, NoopMailDeliveryService>();
             }
 
-#if NET461
-            if(globalSettings.SelfHosted)
+            if(globalSettings.SelfHosted &&
+                CoreHelpers.SettingHasValue(globalSettings.PushRelayBaseUri) &&
+                globalSettings.Installation?.Id != null &&
+                CoreHelpers.SettingHasValue(globalSettings.Installation?.Key))
             {
-                services.AddSingleton<IPushNotificationService, NoopPushNotificationService>();
-                services.AddSingleton<IPushRegistrationService, NoopPushRegistrationService>();
+                services.AddSingleton<IPushNotificationService, RelayPushNotificationService>();
+                services.AddSingleton<IPushRegistrationService, RelayPushRegistrationService>();
             }
-            else
+#if NET461
+            else if(!globalSettings.SelfHosted)
             {
                 services.AddSingleton<IPushNotificationService, NotificationHubPushNotificationService>();
                 services.AddSingleton<IPushRegistrationService, NotificationHubPushRegistrationService>();
             }
-#else
-            services.AddSingleton<IPushNotificationService, NoopPushNotificationService>();
-            services.AddSingleton<IPushRegistrationService, NoopPushRegistrationService>();
 #endif
+            else
+            {
+                services.AddSingleton<IPushNotificationService, NoopPushNotificationService>();
+                services.AddSingleton<IPushRegistrationService, NoopPushRegistrationService>();
+            }
 
             if(CoreHelpers.SettingHasValue(globalSettings.Storage.ConnectionString))
             {