AW-3569 Added posibility to login with username/password

FarmmapsApi/Services/FarmmapsApiService.cs

@@ -53,9 +53,16 @@ namespace FarmmapsApi.Services
                 throw new AuthenticationException("Already seems to be authenticated");
 
             var disco = await _openIdConnectService.GetDiscoveryDocumentAsync();
-            var token = await _openIdConnectService.GetTokenClientCredentialsAsync(disco.TokenEndpoint,
-                _configuration.ClientId, _configuration.ClientSecret);
 
+            var usePasswordGrant = string.IsNullOrEmpty(_configuration.ClientId) ||
+                                   string.IsNullOrEmpty(_configuration.ClientSecret);
+            
+            var token = usePasswordGrant ? 
+                await _openIdConnectService.GetTokenUsernamePasswordAsync(disco.TokenEndpoint,
+                        _configuration.GrantClientId, _configuration.Username, _configuration.Password) :
+                await _openIdConnectService.GetTokenClientCredentialsAsync(disco.TokenEndpoint,
+                _configuration.ClientId, _configuration.ClientSecret);
+            
             if (token.IsError)
                 throw new AuthenticationException(token.Error);
 
@@ -314,7 +321,6 @@ namespace FarmmapsApi.Services
             farmmapsUploader.UploadSessionData += data => location = data.UploadUri;
 
             var progress = await farmmapsUploader.UploadAsync();
-
             return new UploadResults(progress, location);
         }
 

FarmmapsApi/Services/OpenIdConnectService.cs

@@ -2,6 +2,7 @@
 using System.Net.Http;
 using System.Threading.Tasks;
 using FarmmapsApi.Models;
+using IdentityModel;
 using IdentityModel.Client;
 
 namespace FarmmapsApi.Services
@@ -40,6 +41,19 @@ namespace FarmmapsApi.Services
             });
         }
 
+        public async Task<TokenResponse> GetTokenUsernamePasswordAsync(string tokenEndpointUrl, string grantClientId, string username, string password)
+        {
+            return await _httpClient.RequestPasswordTokenAsync(new PasswordTokenRequest()
+            {
+                Address = tokenEndpointUrl,
+                UserName = username,
+                Password = password,
+                ClientId = grantClientId,
+                GrantType = OidcConstants.GrantTypes.Password,
+                Scope = string.Join(" ", _configuration.Scopes)
+            });
+        }
+        
         public async Task<TokenResponse> RefreshTokensAsync(string tokenEndpointUrl, string refreshToken)
         {
             return await _httpClient.RequestRefreshTokenAsync(new RefreshTokenRequest()