add ability to get user based on username or email address

Oqtane.Client/Services/Interfaces/IUserService.cs

@@ -15,7 +15,6 @@ namespace Oqtane.Services
         /// <param name="siteId">ID of a <see cref="Site"/></param>
         /// <returns></returns>
         Task<User> GetUserAsync(int userId, int siteId);
-
         
         /// <summary>
         /// Get a <see cref="User"/> of a specific site
@@ -25,6 +24,15 @@ namespace Oqtane.Services
         /// <returns></returns>
         Task<User> GetUserAsync(string username, int siteId);
 
+        /// <summary>
+        /// Get a <see cref="User"/> of a specific site
+        /// </summary>
+        /// <param name="username">Username / login of a <see cref="User"/></param>
+        /// <param name="email">email address of a <see cref="User"/></param>
+        /// <param name="siteId">ID of a <see cref="Site"/></param>
+        /// <returns></returns>
+        Task<User> GetUserAsync(string username, string email, int siteId);
+
         /// <summary>
         /// Save a user to the Database.
         /// The <see cref="User"/> object contains all the information incl. what <see cref="Site"/> it belongs to. 

Oqtane.Client/Services/UserService.cs

@@ -4,6 +4,7 @@ using System.Net.Http;
 using System.Threading.Tasks;
 using Oqtane.Documentation;
 using System.Net;
+using System.ComponentModel.DataAnnotations;
 
 namespace Oqtane.Services
 {
@@ -21,7 +22,12 @@ namespace Oqtane.Services
 
         public async Task<User> GetUserAsync(string username, int siteId)
         {
-            return await GetJsonAsync<User>($"{Apiurl}/name/{username}?siteid={siteId}");
+            return await GetUserAsync(username, "", siteId);
+        }
+
+        public async Task<User> GetUserAsync(string username, string email, int siteId)
+        {
+            return await GetJsonAsync<User>($"{Apiurl}/name/{(!string.IsNullOrEmpty(username) ? username : "-")}/{(!string.IsNullOrEmpty(email) ? email : "-")}/?siteid={siteId}");
         }
 
         public async Task<User> AddUserAsync(User user)

Oqtane.Server/Controllers/UserController.cs

@@ -61,13 +61,15 @@ namespace Oqtane.Controllers
             }
         }
 
-        // GET api/<controller>/name/x?siteid=x
+        // GET api/<controller>/name/{name}/{email}?siteid=x
-        [HttpGet("name/{name}")]
+        [HttpGet("name/{name}/{email}")]
-        public User Get(string name, string siteid)
+        public User Get(string name, string email, string siteid)
         {
             if (int.TryParse(siteid, out int SiteId) && SiteId == _tenantManager.GetAlias().SiteId)
             {
-                User user = _userManager.GetUser(name, SiteId);
+                name = (name == "-") ? "" : name;
+                email = (email == "-") ? "" : email;
+                User user = _userManager.GetUser(name, email, SiteId);
                 if (user == null)
                 {
                     HttpContext.Response.StatusCode = (int)HttpStatusCode.NotFound;
@@ -76,7 +78,7 @@ namespace Oqtane.Controllers
             }
             else
             {
-                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized User Get Attempt {Username} {SiteId}", name, siteid);
+                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized User Get Attempt {Username} {Email} {SiteId}", name, email, siteid);
                 HttpContext.Response.StatusCode = (int)HttpStatusCode.Forbidden;
                 return null;
             }

Oqtane.Server/Managers/Interfaces/IUserManager.cs

@@ -7,6 +7,7 @@ namespace Oqtane.Managers
     {
         User GetUser(int userid, int siteid);
         User GetUser(string username, int siteid);
+        User GetUser(string username, string email, int siteid);
         Task<User> AddUser(User user);
         Task<User> UpdateUser(User user);
         Task DeleteUser(int userid, int siteid);

Oqtane.Server/Managers/UserManager.cs

@@ -51,7 +51,12 @@ namespace Oqtane.Managers
 
         public User GetUser(string username, int siteid)
         {
-            User user = _users.GetUser(username);
+            return GetUser(username, "", siteid);
+        }
+
+        public User GetUser(string username, string email, int siteid)
+        {
+            User user = _users.GetUser(username, email);
             if (user != null)
             {
                 user.SiteId = siteid;

Oqtane.Server/Repository/Interfaces/IUserRepository.cs

@@ -11,6 +11,7 @@ namespace Oqtane.Repository
         User GetUser(int userId);
         User GetUser(int userId, bool tracking);
         User GetUser(string username);
+        User GetUser(string username, string email);
         void DeleteUser(int userId);
     }
 }

Oqtane.Server/Repository/UserRepository.cs

@@ -105,7 +105,21 @@ namespace Oqtane.Repository
 
         public User GetUser(string username)
         {
-            return _db.User.Where(item => item.Username == username).FirstOrDefault();
+            return GetUser(username, "");
+        }
+
+        public User GetUser(string username, string email)
+        {
+            User user = null;
+            if (!string.IsNullOrEmpty(username))
+            {
+                user = _db.User.Where(item => item.Username == username).FirstOrDefault();
+            }
+            if (user == null && !string.IsNullOrEmpty(email))
+            {
+                user = _db.User.Where(item => item.Email == email).FirstOrDefault();
+            }
+            return user;
         }
 
         public void DeleteUser(int userId)