Issue #33 get device connection string only on button click

src/AzureIoTHub.Portal/Client/Pages/Gateways/Detail.razor

@@ -255,12 +255,16 @@ else
 
     public async Task ShowConnectionString()
     {
+        gateway.SymmetricKey = await this.Http.GetStringAsync($"api/Gateways/{gateway.DeviceId}/ConnectionString");
+
         var parameter = new DialogParameters();
+
         parameter.Add(nameof(Gateway.DeviceId), gateway.DeviceId);
         parameter.Add(nameof(Gateway.EndPoint), gateway.EndPoint);
         parameter.Add(nameof(Gateway.SymmetricKey), gateway.SymmetricKey);
 
-        var result = await DialogService.Show<ConnectionString>("ConnectionString gateway ", parameter).Result;
+
+        DialogService.Show<ConnectionString>("ConnectionString gateway ", parameter);
     }
 
     public async Task DeleteDeviceAsync()

src/AzureIoTHub.Portal/Server/Controllers/GatewaysController.cs

@@ -11,6 +11,7 @@ namespace AzureIoTHub.Portal.Server.Controllers
     using System.Threading.Tasks;
     using AzureIoTHub.Portal.Server.Helpers;
     using AzureIoTHub.Portal.Server.Interfaces;
+    using AzureIoTHub.Portal.Server.Managers;
     using AzureIoTHub.Portal.Server.Services;
     using AzureIoTHub.Portal.Shared.Models;
     using AzureIoTHub.Portal.Shared.Security;
@@ -36,17 +37,20 @@ public class GatewaysController : ControllerBase
         private readonly RegistryManager registryManager;
         private readonly IConfiguration configuration;
         private readonly IDeviceService devicesService;
+        private readonly IConnectionStringManager connectionStringManager;
 
         public GatewaysController(
             IConfiguration configuration,
             ILogger<GatewaysController> logger,
             RegistryManager registryManager,
+            IConnectionStringManager connectionStringManager,
             IDeviceService service)
         {
             this.logger = logger;
             this.registryManager = registryManager;
             this.configuration = configuration;
             this.devicesService = service;
+            this.connectionStringManager = connectionStringManager;
         }
 
         /// <summary>
@@ -140,6 +144,19 @@ public async Task<IActionResult> Get(string deviceId)
             }
         }
 
+        [HttpGet("{deviceId}/ConnectionString")]
+        public async Task<IActionResult> GetSymmetricKey(string deviceId)
+        {
+            try
+            {
+                return this.Ok(await this.connectionStringManager.GetSymmetricKey(deviceId));
+            }
+            catch (Exception e)
+            {
+                return this.BadRequest(e.Message);
+            }
+        }
+
         /// <summary>
         /// this function create a device with the twin information.
         /// </summary>

src/AzureIoTHub.Portal/Server/Helpers/DeviceHelper.cs

@@ -25,6 +25,7 @@ public static string RetrieveSymmetricKey(string deviceId, AttestationMechanism
             // then we get the symmetricKey
             SymmetricKeyAttestation symmetricKey = attestationMechanism.GetAttestation() as SymmetricKeyAttestation;
             using var hmac = new HMACSHA256(Encoding.UTF8.GetBytes(symmetricKey.PrimaryKey));
+
             return Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(deviceId)));
         }
 

src/AzureIoTHub.Portal/Server/Managers/ConnectionStringManager.cs

@@ -0,0 +1,33 @@
+// Copyright (c) CGI France - Grand Est. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace AzureIoTHub.Portal.Server.Managers
+{
+    using System.Threading.Tasks;
+    using AzureIoTHub.Portal.Server.Helpers;
+    using AzureIoTHub.Portal.Server.Services;
+
+    public class ConnectionStringManager : IConnectionStringManager
+    {
+        private readonly IDeviceService deviceService;
+
+        public ConnectionStringManager(IDeviceService deviceService)
+        {
+            this.deviceService = deviceService;
+        }
+
+        public async Task<string> GetSymmetricKey(string deviceId)
+        {
+            try
+            {
+                var attestationMechanism = await this.deviceService.GetDpsAttestionMechanism();
+
+                return DeviceHelper.RetrieveSymmetricKey(deviceId, attestationMechanism);
+            }
+            catch (System.Exception e)
+            {
+                throw new System.Exception(e.Message);
+            }
+        }
+    }
+}

src/AzureIoTHub.Portal/Server/Managers/IConnectionStringManager.cs

@@ -0,0 +1,12 @@
+// Copyright (c) CGI France - Grand Est. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace AzureIoTHub.Portal.Server.Managers
+{
+    using System.Threading.Tasks;
+
+    public interface IConnectionStringManager
+    {
+        Task<string> GetSymmetricKey(string deviceId);
+    }
+}

src/AzureIoTHub.Portal/Server/Startup.cs

@@ -100,11 +100,11 @@ public void ConfigureServices(IServiceCollection services)
             services.AddTransient(sp => new BlobServiceClient(configuration.StorageAccountConnectionString));
             services.AddTransient<ITableClientFactory>(sp => new TableClientFactory(configuration.StorageAccountConnectionString));
             services.AddTransient<IDeviceModelImageManager, DeviceModelImageManager>();
-            // services.AddTransient<ILoraDeviceMethodManager, LoraDeviceMethodManager>();
             services.AddTransient<IDeviceService, DeviceService>();
             services.AddTransient<IDeviceTwinMapper, DeviceTwinMapper>();
             services.AddTransient<IDeviceModelCommandMapper, DeviceModelCommandMapper>();
             services.AddTransient<IDeviceModelMapper, DeviceModelMapper>();
+            services.AddTransient<IConnectionStringManager, ConnectionStringManager>();
 
             services.AddTransient<ConfigsServices>();
 
@@ -210,6 +210,7 @@ internal abstract class ConfigHandler
         {
             protected const string IoTHubConnectionStringKey = "IoTHub:ConnectionString";
             protected const string DPSConnectionStringKey = "IoTDPS:ConnectionString";
+            protected const string DPSDefaultEnrollmentGroupeKey = "IoTDPS:DefaultEnrollmentGroupe";
 
             protected const string MsalScopeNameKey = "MsalSettings:ScopeName";
             protected const string MsalInstanceKey = "MsalSettings:Instance";
@@ -242,6 +243,8 @@ internal static ConfigHandler Create(IWebHostEnvironment env, IConfiguration con
 
             internal abstract string DPSConnectionString { get; }
 
+            internal abstract string DPSDefaultEnrollmentGroupe { get; }
+
             internal abstract string StorageAccountConnectionString { get; }
 
             internal abstract string MsalScopeName { get; }
@@ -284,6 +287,8 @@ internal ProductionConfigHandler(IConfiguration config)
 
             internal override string DPSConnectionString => this.config.GetConnectionString(DPSConnectionStringKey);
 
+            internal override string DPSDefaultEnrollmentGroupe => this.config[DPSDefaultEnrollmentGroupeKey];
+
             internal override string StorageAccountConnectionString => this.config.GetConnectionString(StorageAccountConnectionStringKey);
 
             internal override string MsalScopeName => this.config[MsalScopeNameKey];
@@ -326,6 +331,8 @@ internal DevelopmentConfigHandler(IConfiguration config)
 
             internal override string DPSConnectionString => this.config[DPSConnectionStringKey];
 
+            internal override string DPSDefaultEnrollmentGroupe => this.config[DPSDefaultEnrollmentGroupeKey];
+
             internal override string StorageAccountConnectionString => this.config[StorageAccountConnectionStringKey];
 
             internal override string MsalScopeName => this.config[MsalScopeNameKey];