Updated how Graph service exceptions are handling in controls (#142)

* Improved Graph exception handling in PeoplePicker and PersonView

CommunityToolkit.Graph.Uwp/Controls/LoginButton/LoginButton.cs

@@ -7,6 +7,7 @@ using System.ComponentModel;
 using System.Threading.Tasks;
 using CommunityToolkit.Authentication;
 using CommunityToolkit.Graph.Extensions;
+using Microsoft.Graph;
 using Windows.UI.Xaml;
 using Windows.UI.Xaml.Controls;
 using Windows.UI.Xaml.Controls.Primitives;
@@ -212,7 +213,13 @@ namespace CommunityToolkit.Graph.Uwp.Controls
             {
                 case ProviderState.SignedIn:
                     IsLoading = true;
-                    await SetUserDetails();
+                    if (!await TrySetUserDetailsAsync())
+                    {
+                        // Failed to retrieve user details, force signout.
+                        await SignOutAsync();
+                        return;
+                    }
+
                     IsLoading = false;
                     LoginCompleted?.Invoke(this, new EventArgs());
                     break;
@@ -284,20 +291,36 @@ namespace CommunityToolkit.Graph.Uwp.Controls
             }
         }
 
-        private async Task SetUserDetails()
+        private async Task<bool> TrySetUserDetailsAsync()
         {
+            User userDetails = null;
+
             var provider = ProviderManager.Instance.GlobalProvider;
             if (provider != null)
             {
                 try
                 {
-                    UserDetails = await provider.GetClient().GetMeAsync();
+                    userDetails = await provider.GetClient().GetMeAsync();
                 }
-                catch
+                catch (Microsoft.Graph.ServiceException e)
                 {
-                    // TODO: Handle if UserDetails is null.
+                    if (e.StatusCode == System.Net.HttpStatusCode.Forbidden)
+                    {
+                        // Insufficient privileges.
+                        // Incremental consent must not be supported by the current provider.
+                        // TODO: Log or handle the lack of sufficient privileges.
+                    }
+                    else
+                    {
+                        // Something unexpected happened.
+                        throw;
+                    }
                 }
             }
+
+            UserDetails = userDetails;
+
+            return UserDetails != null;
         }
 
         private void ClearUserDetails()

CommunityToolkit.Graph.Uwp/Controls/PeoplePicker/PeoplePicker.cs

@@ -105,14 +105,25 @@ namespace CommunityToolkit.Graph.Uwp.Controls
             IGraphServiceUsersCollectionPage usersCollection = null;
             try
             {
+                // Returns an empty collection if no results found.
                 usersCollection = await graph.FindUserAsync(text);
             }
-            catch
+            catch (Microsoft.Graph.ServiceException e)
             {
-                // No users found.
+                if (e.StatusCode == System.Net.HttpStatusCode.Forbidden)
+                {
+                    // Insufficient privileges.
+                    // Incremental consent must not be supported by the current provider.
+                    // TODO: Log or handle the lack of sufficient privileges.
+                }
+                else
+                {
+                    // Something unexpected happened.
+                    throw;
+                }
             }
 
-            if (usersCollection != null)
+            if (usersCollection != null && usersCollection.Count > 0)
             {
                 foreach (var user in usersCollection.CurrentPage)
                 {
@@ -127,14 +138,25 @@ namespace CommunityToolkit.Graph.Uwp.Controls
             IUserPeopleCollectionPage peopleCollection = null;
             try
             {
+                // Returns an empty collection if no results found.
                 peopleCollection = await graph.FindPersonAsync(text);
             }
-            catch
+            catch (Microsoft.Graph.ServiceException e)
             {
-                // No people found.
+                if (e.StatusCode == System.Net.HttpStatusCode.Forbidden)
+                {
+                    // Insufficient privileges.
+                    // Incremental consent must not be supported by the current provider.
+                    // TODO: Log or handle the lack of sufficient privileges.
+                }
+                else
+                {
+                    // Something unexpected happened.
+                    throw;
+                }
             }
 
-            if (peopleCollection != null)
+            if (peopleCollection != null && peopleCollection.Count > 0)
             {
                 // Grab ids of current suggestions
                 var ids = list.Cast<object>().Select(person => (person as Person).Id);

CommunityToolkit.Graph.Uwp/Controls/PersonView/PersonView.cs

@@ -121,7 +121,11 @@ namespace CommunityToolkit.Graph.Uwp.Controls
 
             if (provider?.State == ProviderState.SignedIn)
             {
-                await TryLoadPersonDetailsAsync();
+                if (!await TryLoadPersonDetailsAsync())
+                {
+                    // TODO: Handle failure to load the PersonDetails.
+                }
+
                 UpdateVisual();
             }
             else
@@ -132,6 +136,12 @@ namespace CommunityToolkit.Graph.Uwp.Controls
 
         private async void UpdateVisual()
         {
+            if (PersonDetails == null)
+            {
+                LoadDefaultImage();
+                return;
+            }
+
             if (PersonAvatarType is PersonAvatarType.Initials)
             {
                 var initialsLoaded = TryLoadInitials();
@@ -144,31 +154,24 @@ namespace CommunityToolkit.Graph.Uwp.Controls
                     LoadDefaultImage();
                 }
             }
-            else if (PersonDetails != null)
+            else if (PersonDetails.Id != _photoId)
             {
-                if (PersonDetails.Id != _photoId)
+                var photoLoaded = await TryLoadUserPhotoAsync();
+                if (photoLoaded)
                 {
-                    LoadDefaultImage();
+                    UpdateImageSize();
+                }
+                else
+                {
+                    ClearUserPhoto();
 
-                    var photoLoaded = await TryLoadUserPhotoAsync();
-                    if (photoLoaded)
+                    var initialsLoaded = TryLoadInitials();
+                    if (!initialsLoaded)
                     {
-                        UpdateImageSize();
-                    }
-                    else
-                    {
-                        var initialsLoaded = TryLoadInitials();
-                        if (initialsLoaded)
-                        {
-                            ClearUserPhoto();
-                        }
+                        LoadDefaultImage();
                     }
                 }
             }
-            else
-            {
-                LoadDefaultImage();
-            }
         }
 
         private void LoadDefaultImage()
@@ -200,6 +203,7 @@ namespace CommunityToolkit.Graph.Uwp.Controls
 
         private async Task<bool> TryLoadPersonDetailsAsync()
         {
+            // TODO: Better guarding.
             if (PersonDetails != null)
             {
                 return true;
@@ -208,50 +212,61 @@ namespace CommunityToolkit.Graph.Uwp.Controls
             var provider = ProviderManager.Instance.GlobalProvider;
             if (provider?.State != ProviderState.SignedIn)
             {
+                PersonDetails = null;
                 return false;
             }
 
+            var graph = provider.GetClient();
+
             try
             {
                 if (!string.IsNullOrWhiteSpace(UserId))
                 {
-                    var user = await provider.GetClient().GetUserAsync(UserId);
+                    var user = await graph.GetUserAsync(UserId);
                     PersonDetails = user.ToPerson();
                 }
                 else if (PersonQuery?.ToLowerInvariant() == PersonQueryMe)
                 {
-                    var user = await provider.GetClient().GetMeAsync();
+                    var user = await graph.GetMeAsync();
                     PersonDetails = user.ToPerson();
                 }
                 else if (!string.IsNullOrWhiteSpace(PersonQuery))
                 {
-                    var people = await provider.GetClient().FindPersonAsync(PersonQuery);
+                    var people = await graph.FindPersonAsync(PersonQuery);
                     if (people != null && people.Count > 0)
                     {
-                        var person = people.FirstOrDefault();
-                        PersonDetails = person;
+                        PersonDetails = people.FirstOrDefault();
                     }
                 }
-
-                return PersonDetails != null;
             }
-            catch
+            catch (Microsoft.Graph.ServiceException e)
             {
-                // TODO: Log exception
+                if (e.StatusCode == System.Net.HttpStatusCode.Forbidden)
+                {
+                    // Insufficient privileges.
+                    // Incremental consent must not be supported by the current provider.
+                    // TODO: Log or handle the lack of sufficient privileges.
+                }
+                else
+                {
+                    // Something unexpected happened.
+                    throw;
+                }
             }
 
-            return false;
+            return PersonDetails != null;
         }
 
         private async Task<bool> TryLoadUserPhotoAsync()
         {
+            // TODO: Better guarding.
             var person = PersonDetails;
             if (person == null)
             {
                 return false;
             }
 
-            if (PersonDetails.Id == _photoId && UserPhoto != null && UserPhoto != _defaultImage)
+            if (person.Id == _photoId && UserPhoto != null && UserPhoto != _defaultImage)
             {
                 return true;
             }
@@ -264,27 +279,51 @@ namespace CommunityToolkit.Graph.Uwp.Controls
 
             Stream photoStream = null;
 
-            // TODO: Better guarding
             try
             {
                 var graph = ProviderManager.Instance.GlobalProvider?.GetBetaClient();
                 photoStream = await graph.GetUserPhoto(person.Id);
             }
-            catch
+            catch (Microsoft.Graph.ServiceException e)
             {
-                // TODO: Log exception
+                if (e.StatusCode == System.Net.HttpStatusCode.Forbidden)
+                {
+                    // Insufficient privileges.
+                    // Incremental consent must not be supported by the current provider.
+                    // TODO: Log or handle the lack of sufficient privileges.
+                }
+                else if (e.StatusCode == System.Net.HttpStatusCode.BadRequest)
+                {
+                    // This entity does not support profile photos.
+                }
+                else if (e.StatusCode == System.Net.HttpStatusCode.NotFound)
+                {
+                    // Image not found.
+                }
+                else if ((int)e.StatusCode == 422)
+                {
+                    // IncorrectRecipientTypeDetected:
+                    // Incorrect recipient type detected in request url. Retry with Groups as the object type.
+                }
+                else
+                {
+                    // Something unexpected happened.
+                    throw;
+                }
             }
 
-            if (photoStream != null)
+            if (photoStream == null)
             {
-                var decodeResults = await TryDecodeStreamAsync(photoStream);
-                if (decodeResults.Success)
-                {
-                    UserPhoto = decodeResults.Image;
-                    _photoId = person.Id;
+                return false;
+            }
 
-                    return true;
-                }
+            var decodeResults = await TryDecodeStreamAsync(photoStream);
+            if (decodeResults.Success)
+            {
+                UserPhoto = decodeResults.Image;
+                _photoId = person.Id;
+
+                return true;
             }
 
             return false;

CommunityToolkit.Graph/Extensions/GraphExtensions.People.cs

@@ -20,21 +20,13 @@ namespace CommunityToolkit.Graph.Extensions
         /// <returns><see cref="IUserPeopleCollectionPage"/> collection of <see cref="Person"/>.</returns>
         public static async Task<IUserPeopleCollectionPage> FindPersonAsync(this GraphServiceClient graph, string query)
         {
-            try
-            {
-                return await graph
-                    .Me
-                    .People
-                    .Request()
-                    .Search(query)
-                    ////.WithScopes(new string[] { "people.read" })
-                    .GetAsync();
-            }
-            catch
-            {
-            }
-
-            return new UserPeopleCollectionPage();
+            return await graph
+                .Me
+                .People
+                .Request()
+                .Search(query)
+                .WithScopes(new string[] { "people.read" })
+                .GetAsync();
         }
     }
 }