Initial resumable file upload.

Other changes.

FarmmapsApi/FarmmapsApi.csproj

@@ -5,6 +5,7 @@
     </PropertyGroup>
 
     <ItemGroup>
+        <PackageReference Include="Google.Apis" Version="1.44.1" />
         <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="3.1.2" />
         <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.2" />
         <PackageReference Include="Microsoft.Extensions.Http" Version="3.1.2" />
@@ -12,6 +13,7 @@
         <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="3.1.2" />
         <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.1.2" />
         <PackageReference Include="IdentityModel.OidcClient" Version="3.1.2" />
+        <PackageReference Include="Winista.MimeDetect" Version="1.0.1" />
     </ItemGroup>
 
 </Project>

FarmmapsApi/Models/Configuration.cs

@@ -4,6 +4,7 @@
     {
         public string Authority { get; set; } 
         public string Endpoint { get; set; } 
+        public string BasePath { get; set; } 
         public string DiscoveryEndpointUrl { get; set; } 
         public string RedirectUri { get; set; } 
         public string ClientId { get; set; } 

FarmmapsApi/Models/FileRequest.cs

@@ -0,0 +1,45 @@
+using System.ComponentModel.DataAnnotations;
+using Newtonsoft.Json.Linq;
+
+namespace FarmmapsApi.Models
+{
+    public class FileRequest
+    {
+        /// <summary>
+        /// Code of the parent
+        /// </summary>
+        /// <example>41971e7ea8a446069a817e66b608dcae</example>
+        public string ParentCode { get; set; }
+
+        /// <summary>
+        /// Geometry meta data
+        /// </summary>
+        /// <example>{"type": "Point","coordinates": [5.27, 52.10]}</example>
+        public JObject Geometry { get; set; }
+
+        /// <summary>
+        /// Name of the file to upload
+        /// </summary>
+        /// <example>MyFile.tiff</example>
+        [Required]
+        public string Name { get; set; }
+
+        /// <summary>
+        /// Size of the file to upload
+        /// </summary>
+        /// <example>67351</example>      
+        [Required]
+        public long Size { get; set; }
+
+        /// <summary>
+        /// If a chunked upload, the size of a single chunk
+        /// </summary>   
+        /// <example>1048576</example>
+        public long ChunkSize { get; set; }
+
+        /// <summary>
+        /// Optional data for the item coupled with the file
+        /// </summary>
+        public JObject Data { get; set; }
+    }
+}

FarmmapsApi/Models/FileResponse.cs

@@ -0,0 +1,17 @@
+namespace FarmmapsApi.Models
+{
+    public class FileResponse : FileRequest
+    {
+        /// <summary>
+        /// Code created for the registered file, use this in subsequent calls
+        /// </summary>
+        /// <example>a00fbd18320742c787f99f952aef0dbb</example>
+        public string Code { get; set; }
+
+        /// <summary>
+        /// If a chunked upload, the number of chunks to upload
+        /// </summary>
+        /// <example>1</example>
+        public long Chunks { get; set; }
+    }
+}

FarmmapsApi/Services/FarmmapsApiService.cs

@@ -10,18 +10,20 @@ using System.Text;
 using System.Threading.Tasks;
 using System.Web;
 using FarmmapsApi.Models;
+using Google.Apis.Http;
+using Google.Apis.Upload;
 using IdentityModel;
 using Microsoft.AspNetCore.Http.Connections;
 using Microsoft.AspNetCore.SignalR.Client;
 using Microsoft.Extensions.Logging;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
+using Winista.Mime;
 
 namespace FarmmapsApi.Services
 {
     public class FarmmapsApiService
     {
-        private readonly ILogger<FarmmapsApiService> _logger;
         private readonly HttpClient _httpClient;
         private readonly OpenIdConnectService _openIdConnectService;
         private readonly Configuration _configuration;
@@ -30,10 +32,9 @@ namespace FarmmapsApi.Services
 
         public event Action<EventMessage> EventCallback;
 
-        public FarmmapsApiService(HttpClient httpClient, ILogger<FarmmapsApiService> logger,
+        public FarmmapsApiService(HttpClient httpClient, 
             OpenIdConnectService openIdConnectService, Configuration configuration)
         {
-            _logger = logger;
             _httpClient = httpClient;
             _openIdConnectService = openIdConnectService;
             _configuration = configuration;
@@ -65,8 +66,7 @@ namespace FarmmapsApi.Services
 
         private async Task StartEventHub(string accessToken)
         {
-            var uri = new Uri(_configuration.Endpoint);
+            var eventEndpoint = $"{_configuration.Endpoint}/EventHub";
-            var eventEndpoint = $"{uri.Scheme}://{uri.Host}:{uri.Port}/EventHub";
             _hubConnection = new HubConnectionBuilder()
                 .WithUrl(eventEndpoint, HttpTransportType.WebSockets,
                     options => options.SkipNegotiation = true)
@@ -78,7 +78,7 @@ namespace FarmmapsApi.Services
             await AuthenticateEventHub(accessToken);
 
             _hubConnection.Reconnected += async s => await AuthenticateEventHub(accessToken);
-            _hubConnection.On("event", (Object @event) => _logger.LogInformation(@event.ToString()));
+            _hubConnection.On("event", (EventMessage eventMessage) => EventCallback?.Invoke(eventMessage));
         }
 
         private async Task AuthenticateEventHub(string accessToken)
@@ -88,7 +88,8 @@ namespace FarmmapsApi.Services
 
         public async Task<string> GetCurrentUserCodeAsync()
         {
-            var response = await _httpClient.GetAsync(ResourceEndpoints.CURRENTUSER_RESOURCE);
+            var url = $"{_configuration.BasePath}/{ResourceEndpoints.CURRENTUSER_RESOURCE}";
+            var response = await _httpClient.GetAsync(url);
 
             if (!response.IsSuccessStatusCode)
                 throw new Exception(response.ReasonPhrase);
@@ -100,7 +101,8 @@ namespace FarmmapsApi.Services
 
         public async Task<List<UserRoot>> GetCurrentUserRootsAsync()
         {
-            var response = await _httpClient.GetAsync(ResourceEndpoints.MYROOTS_RESOURCE);
+            var url = $"{_configuration.BasePath}/{ResourceEndpoints.MYROOTS_RESOURCE}";
+            var response = await _httpClient.GetAsync(url);
 
             if (!response.IsSuccessStatusCode)
                 throw new Exception(response.ReasonPhrase);
@@ -121,7 +123,8 @@ namespace FarmmapsApi.Services
 
         public async Task<List<Item>> GetItemsAsync(string itemCode, string itemType = null, JObject dataFilter = null)
         {
-            var resourceUri = string.Format(ResourceEndpoints.ITEMS_RESOURCE, itemCode);
+            var url = $"{_configuration.BasePath}/{ResourceEndpoints.ITEMS_RESOURCE}";
+            var resourceUri = string.Format(url, itemCode);
 
             var queryString = HttpUtility.ParseQueryString(string.Empty);
 
@@ -149,7 +152,8 @@ namespace FarmmapsApi.Services
 
         private async Task<Item> GetItemSingleAsync(string itemCode, string itemType = null)
         {
-            var resourceUri = string.Format(ResourceEndpoints.ITEMS_RESOURCE, itemCode);
+            var url = $"{_configuration.BasePath}/{ResourceEndpoints.ITEMS_RESOURCE}";
+            var resourceUri = string.Format(url, itemCode);
 
             if (!string.IsNullOrEmpty(itemType))
                 resourceUri = $"{resourceUri}/{itemType}";
@@ -168,9 +172,11 @@ namespace FarmmapsApi.Services
             return JsonConvert.DeserializeObject<Item>(jsonString);
         }
 
-        public async Task<List<Item>> GetItemChildrenAsync(string itemCode, string itemType = null, JObject dataFilter = null)
+        public async Task<List<Item>> GetItemChildrenAsync(string itemCode, string itemType = null,
+            JObject dataFilter = null)
         {
-            var resourceUri = string.Format(ResourceEndpoints.ITEMS_CHILDREN_RESOURCE, itemCode);
+            var url = $"{_configuration.BasePath}/{ResourceEndpoints.ITEMS_CHILDREN_RESOURCE}";
+            var resourceUri = string.Format(url, itemCode);
 
             var queryString = HttpUtility.ParseQueryString(string.Empty);
 
@@ -195,8 +201,9 @@ namespace FarmmapsApi.Services
         {
             var jsonString = JsonConvert.SerializeObject(itemRequest);
 
+            var url = $"{_configuration.BasePath}/{ResourceEndpoints.ITEMS_CREATE_RESOURCE}";
             var content = new StringContent(jsonString, Encoding.UTF8, MediaTypeNames.Application.Json);
-            var response = await _httpClient.PostAsync(ResourceEndpoints.ITEMS_CREATE_RESOURCE, 
+            var response = await _httpClient.PostAsync(url,
                 content);
 
             if (!response.IsSuccessStatusCode)
@@ -208,7 +215,8 @@ namespace FarmmapsApi.Services
 
         public async Task DeleteItemAsync(string itemCode)
         {
-            var resourceUri = string.Format(ResourceEndpoints.ITEMS_RESOURCE, itemCode);
+            var url = $"{_configuration.BasePath}/{ResourceEndpoints.ITEMS_RESOURCE}";
+            var resourceUri = string.Format(url, itemCode);
             var response = await _httpClient.DeleteAsync(resourceUri);
 
             if (!response.IsSuccessStatusCode)
@@ -219,7 +227,8 @@ namespace FarmmapsApi.Services
         {
             var jsonString = JsonConvert.SerializeObject(itemCodes);
             var content = new StringContent(jsonString);
-            var response = await _httpClient.PostAsync(ResourceEndpoints.ITEMS_DELETE_RESOURCE, content);
+            var url = $"{_configuration.BasePath}/{ResourceEndpoints.ITEMS_DELETE_RESOURCE}";
+            var response = await _httpClient.PostAsync(url, content);
 
             if (!response.IsSuccessStatusCode)
                 throw new Exception(response.ReasonPhrase);
@@ -227,7 +236,8 @@ namespace FarmmapsApi.Services
 
         public async Task DownloadItemAsync(string itemCode, string filePath)
         {
-            var resourceUri = string.Format(ResourceEndpoints.ITEMS_DOWNLOAD_RESOURCE, itemCode);
+            var url = $"{_configuration.BasePath}/{ResourceEndpoints.ITEMS_DOWNLOAD_RESOURCE}";
+            var resourceUri = string.Format(url, itemCode);
             var response = await _httpClient.GetAsync(resourceUri, HttpCompletionOption.ResponseHeadersRead);
 
             if (response.IsSuccessStatusCode)
@@ -244,7 +254,8 @@ namespace FarmmapsApi.Services
 
         public async Task<string> QueueTaskAsync(string itemCode, TaskRequest taskRequest)
         {
-            var resourceUri = string.Format(ResourceEndpoints.ITEMTASK_REQUEST_RESOURCE, itemCode);
+            var url = $"{_configuration.BasePath}/{ResourceEndpoints.ITEMTASK_REQUEST_RESOURCE}";
+            var resourceUri = string.Format(url, itemCode);
 
             var jsonString = JsonConvert.SerializeObject(taskRequest);
             var content = new StringContent(jsonString, Encoding.UTF8, MediaTypeNames.Application.Json);
@@ -261,7 +272,8 @@ namespace FarmmapsApi.Services
 
         public async Task<List<ItemTaskStatus>> GetTasksStatusAsync(string itemCode)
         {
-            var resourceUri = string.Format(ResourceEndpoints.ITEMTASKS_RESOURCE, itemCode);
+            var url = $"{_configuration.BasePath}/{ResourceEndpoints.ITEMTASKS_RESOURCE}";
+            var resourceUri = string.Format(url, itemCode);
             var response = await _httpClient.GetAsync(resourceUri);
 
             if (!response.IsSuccessStatusCode)
@@ -273,7 +285,8 @@ namespace FarmmapsApi.Services
 
         public async Task<ItemTaskStatus> GetTaskStatusAsync(string itemCode, string itemTaskCode)
         {
-            var resourceUri = string.Format(ResourceEndpoints.ITEMTASK_RESOURCE, itemCode, itemTaskCode);
+            var url = $"{_configuration.BasePath}/{ResourceEndpoints.ITEMTASK_RESOURCE}";
+            var resourceUri = string.Format(url, itemCode, itemTaskCode);
             var response = await _httpClient.GetAsync(resourceUri);
 
             if (!response.IsSuccessStatusCode)
@@ -282,5 +295,85 @@ namespace FarmmapsApi.Services
             var jsonString = await response.Content.ReadAsStringAsync();
             return JsonConvert.DeserializeObject<ItemTaskStatus>(jsonString);
         }
+
+        /// <summary>
+        /// Experimental
+        /// </summary>
+        /// <param name="filePath"></param>
+        /// <param name="parentItemCode"></param>
+        /// <param name="uploadCallback"></param>
+        /// <returns></returns>
+        /// <exception cref="FileNotFoundException"></exception>
+        public async Task<Uri> UploadFile(string filePath, string parentItemCode, Action<IUploadProgress> uploadCallback)
+        {
+            if (!File.Exists(filePath))
+                throw new FileNotFoundException($"File not found {filePath}");
+            
+            var mimeTypes = new MimeTypes();
+            var mimeType = mimeTypes.GetMimeTypeFromFile(filePath);
+            
+            await using var uploadStream = new FileStream(filePath, FileMode.OpenOrCreate);
+            
+            var request = new FileRequest()
+            {
+                Name = Path.GetFileName(filePath),
+                ParentCode = parentItemCode,
+                Size = uploadStream.Length
+            };
+
+            Uri uploadIdentifierUri = null;
+            using var httpClient = CreateConfigurableHttpClient(_httpClient);
+            var farmmapsUploader = new FarmmapsUploader(httpClient, uploadStream, request, mimeType.ToString());
+            
+            farmmapsUploader.ProgressChanged += uploadCallback;
+            farmmapsUploader.UploadSessionData += data => uploadIdentifierUri = data.UploadUri;
+            
+            await farmmapsUploader.UploadAsync();
+
+            return uploadIdentifierUri;
+        }
+
+        /// <summary>
+        /// Experimental
+        /// </summary>
+        /// <param name="filePath"></param>
+        /// <param name="location"></param>
+        /// <param name="uploadCallback"></param>
+        /// <returns></returns>
+        /// <exception cref="FileNotFoundException"></exception>
+        private async Task<Uri> ResumeUploadFile(string filePath, Uri location, Action<IUploadProgress> uploadCallback)
+        {
+            if (!File.Exists(filePath))
+                throw new FileNotFoundException($"File not found {filePath}");
+
+            await using var uploadStream = new FileStream(filePath, FileMode.OpenOrCreate);
+            
+            var request = new FileRequest()
+            {
+                Name = Path.GetFileName(filePath),
+                ParentCode = string.Empty,
+                Size = uploadStream.Length
+            };
+
+            using var httpClient = CreateConfigurableHttpClient(_httpClient);
+            var farmmapsUploader = new FarmmapsUploader(httpClient, uploadStream, request, string.Empty);
+            farmmapsUploader.ProgressChanged += uploadCallback;
+
+            await farmmapsUploader.ResumeAsync(location);
+
+            return location;
+        }
+
+        private ConfigurableHttpClient CreateConfigurableHttpClient(HttpClient parent)
+        {
+            var googleHttpClient = new HttpClientFactory().CreateHttpClient(new CreateHttpClientArgs {GZipEnabled = true, ApplicationName = "FarmMaps"});
+            googleHttpClient.BaseAddress = parent.BaseAddress;
+            googleHttpClient.DefaultRequestHeaders.Add("Accept", MediaTypeNames.Application.Json);
+
+            var authHeader = parent.DefaultRequestHeaders.Authorization;
+            googleHttpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(authHeader.Scheme, authHeader.Parameter);
+
+            return googleHttpClient;
+        }
     }
 }

FarmmapsApi/Services/FarmmapsUploader.cs

@@ -0,0 +1,160 @@
+using System;
+using System.Collections;
+using System.IO;
+using System.Net.Http;
+using System.Net.Mime;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using FarmmapsApi.Models;
+using Google.Apis.Http;
+using Google.Apis.Json;
+using Google.Apis.Requests;
+using Google.Apis.Upload;
+using Google.Apis.Util;
+using Newtonsoft.Json;
+
+namespace FarmmapsApi.Services
+{
+    public class FarmmapsUploader : ResumableUpload
+    {
+        /// <summary>Payload description headers, describing the content itself.</summary>
+        private const string PayloadContentTypeHeader = "X-Upload-Content-Type";
+
+        /// <summary>Payload description headers, describing the content itself.</summary>
+        private const string PayloadContentLengthHeader = "X-Upload-Content-Length";
+
+        private const int UnknownSize = -1;
+
+        /// <summary>Gets or sets the service.</summary>
+        private HttpClient HttpClient { get; }
+
+        /// <summary>
+        /// Gets or sets the path of the method (combined with
+        /// <see cref="Google.Apis.Services.IClientService.BaseUri"/>) to produce 
+        /// absolute Uri. 
+        /// </summary>
+        private string Path { get; }
+
+        /// <summary>Gets or sets the HTTP method of this upload (used to initialize the upload).</summary>
+        private string HttpMethod { get; }
+
+        /// <summary>Gets or sets the stream's Content-Type.</summary>
+        private string ContentType { get; }
+
+        /// <summary>Gets or sets the body of this request.</summary>
+        private FileRequest Body { get; }
+
+        private long _streamLength;
+
+        /// <summary>
+        /// Create a resumable upload instance with the required parameters.
+        /// </summary>
+        /// <param name="contentStream">The stream containing the content to upload.</param>
+        /// <remarks>
+        /// Caller is responsible for maintaining the <paramref name="contentStream"/> open until the upload is 
+        /// completed.
+        /// Caller is responsible for closing the <paramref name="contentStream"/>.
+        /// </remarks>
+        public FarmmapsUploader(ConfigurableHttpClient httpClient, Stream contentStream, FileRequest body, string contentType)
+            : base(contentStream,
+                new ResumableUploadOptions
+                {
+                    HttpClient = httpClient,
+                    Serializer = new NewtonsoftJsonSerializer(),
+                    ServiceName = "FarmMaps"
+                })
+        {
+            httpClient.ThrowIfNull(nameof(httpClient));
+            contentStream.ThrowIfNull(nameof(contentStream));
+            
+            _streamLength = ContentStream.CanSeek ? ContentStream.Length : UnknownSize;
+            Body = body;
+            Path = "api/v1/file";
+            HttpClient = httpClient;
+            HttpMethod = HttpConsts.Post;
+            ContentType = contentType;
+        }
+
+        /// <inheritdoc/>
+        public override async Task<Uri> InitiateSessionAsync(CancellationToken cancellationToken = default)
+        {
+            HttpRequestMessage request = CreateInitializeRequest();
+            Options?.ModifySessionInitiationRequest?.Invoke(request);
+            var response = await HttpClient.SendAsync(request, cancellationToken).ConfigureAwait(false);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                throw await ExceptionForResponseAsync(response).ConfigureAwait(false);
+            }
+            return response.Headers.Location;
+        }
+
+        /// <summary>Creates a request to initialize a request.</summary>
+        private HttpRequestMessage CreateInitializeRequest()
+        {
+            var baseAddres = HttpClient.BaseAddress;
+            var uri = new Uri($"{baseAddres.Scheme}://{baseAddres.Host}:{baseAddres.Port}");
+            var builder = new RequestBuilder()
+            {
+                BaseUri = uri,
+                Path = Path,
+                Method = HttpMethod,
+            };
+            
+            SetAllPropertyValues(builder);
+
+            HttpRequestMessage request = builder.CreateRequest();
+            if (ContentType != null)
+            {
+                request.Headers.Add(PayloadContentTypeHeader, ContentType);
+            }
+
+            // if the length is unknown at the time of this request, omit "X-Upload-Content-Length" header
+            if (ContentStream.CanSeek)
+            {
+                request.Headers.Add(PayloadContentLengthHeader, _streamLength.ToString());
+            }
+
+            var jsonText = JsonConvert.SerializeObject(Body);
+            request.Content = new StringContent(jsonText, Encoding.UTF8, MediaTypeNames.Application.Json);
+
+            return request;
+        }
+        
+        /// <summary>
+        /// Reflectively enumerate the properties of this object looking for all properties containing the 
+        /// RequestParameterAttribute and copy their values into the request builder.
+        /// </summary>
+        private void SetAllPropertyValues(RequestBuilder requestBuilder)
+        {
+            Type myType = this.GetType();
+            var properties = myType.GetProperties();
+
+            foreach (var property in properties)
+            {
+                var attribute = property.GetCustomAttribute<RequestParameterAttribute>();
+                if (attribute != null)
+                {
+                    string name = attribute.Name ?? property.Name.ToLower();
+                    object value = property.GetValue(this, null);
+                    if (value != null)
+                    {
+                        if (!(value is string) && value is IEnumerable valueAsEnumerable)
+                        {
+                            foreach (var elem in valueAsEnumerable)
+                            {
+                                requestBuilder.AddParameter(attribute.Type, name, Utilities.ConvertToString(elem));
+                            }
+                        }
+                        else
+                        {
+                            // Otherwise just convert it to a string.
+                            requestBuilder.AddParameter(attribute.Type, name, Utilities.ConvertToString(value));
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

FarmmapsApiSamples/FarmmapsApiSamples.csproj

@@ -9,6 +9,9 @@
       <None Update="appsettings.json">
         <CopyToOutputDirectory>Always</CopyToOutputDirectory>
       </None>
+      <None Update="Data\**\*">
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+      </None>
     </ItemGroup>
 
     <ItemGroup>

FarmmapsApiSamples/NbsApp.cs

@@ -1,8 +1,11 @@
 using System;
+using System.Globalization;
+using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using FarmmapsApi.Models;
 using FarmmapsApi.Services;
+using Google.Apis.Upload;
 using Microsoft.Extensions.Logging;
 using Newtonsoft.Json.Linq;
 using static FarmmapsApi.Extensions;
@@ -12,6 +15,8 @@ namespace FarmmapsApiSamples
     public class NbsApp : IApp
     {
         private const string USERINPUT_ITEMTYPE = "vnd.farmmaps.itemtype.user.input";
+        private const string GEOTIFF_ITEMTYPE = "vnd.farmmaps.itemtype.geotiff";
+        private const string CROPFIELD_ITEMTYPE = "vnd.farmmaps.itemtype.cropfield";
         private const string VRANBS_TASK = "vnd.farmmaps.task.vranbs";
         
         private readonly ILogger<NbsApp> _logger;
@@ -41,14 +46,33 @@ namespace FarmmapsApiSamples
                 _logger.LogInformation("Authenticated client credentials");
 
                 var roots = await _farmmapsApiService.GetCurrentUserRootsAsync();
-                var myDriveRoot = roots.SingleOrDefault(r => r.Name == "My drive");
                 
+                // upload data to Uploaded
+                var uploadedRoot = roots.SingleOrDefault(r => r.Name == "Uploaded");
+                if (uploadedRoot != null)
+                {
+                    await _farmmapsApiService.UploadFile(Path.Combine("Data", "Scan_1_20190605.zip"), uploadedRoot.Code,
+                        progress =>
+                        {
+                            _logger.LogInformation($"Status: {progress.Status} - BytesSent: {progress.BytesSent}");
+                            if(progress.Status == UploadStatus.Failed)
+                                _logger.LogError($"Uploading failed {progress.Exception.Message}");
+                        });
+                    
+                    // need to transform shape data to geotiff
+
+                    var myDriveRoot = roots.SingleOrDefault(r => r.Name == "My drive");
                     if (myDriveRoot != null)
                     {
                         var cropfieldItem = await GetOrCreateCropfieldItem(myDriveRoot.Code);
-                    var targetN = await CalculateTargetN(cropfieldItem, 60);
                     
+                        _logger.LogInformation($"Calculating targetN with targetYield: {60}");
+                        var targetN = await CalculateTargetN(cropfieldItem, 60);
                         _logger.LogInformation($"TargetN: {targetN}");
+                    
+                        _logger.LogInformation("Calculating nitrogen map");
+//                    var nitrogenMapItem = CalculateNitrogenMap(cropfieldItem,, targetN);
+                    }
                 }
             }
             catch (Exception ex)
@@ -60,7 +84,7 @@ namespace FarmmapsApiSamples
         private async Task<Item> GetOrCreateCropfieldItem(string parentItemCode)
         {
             var cropfieldItems = await
-                _farmmapsApiService.GetItemChildrenAsync(parentItemCode, "vnd.farmmaps.itemtype.cropfield");
+                _farmmapsApiService.GetItemChildrenAsync(parentItemCode,CROPFIELD_ITEMTYPE);
 
             if (cropfieldItems.Count > 0) 
                 return cropfieldItems[0];
@@ -70,18 +94,24 @@ namespace FarmmapsApiSamples
             {
                 ParentCode = parentItemCode,
                 ItemType = "vnd.farmmaps.itemtype.cropfield",
-                Name = "cropfield for VRA",
+                Name = "Cropfield for VRA",
                 DataDate = currentYear,
                 DataEndDate = currentYear.AddYears(1),
                 Data = JObject.FromObject(new
-                    {startDate = currentYear, endDate = currentYear.AddYears(1)}),
+                    {startDate = currentYear, endDate = currentYear.AddMonths(3)}),
                 Geometry = JObject.Parse(
-                    @"{""type"":""Polygon"",""coordinates"":[[[6.09942873984307,53.070025028087],[6.09992507404607,53.0705617890585],[6.10036959220086,53.0710679529031],[6.10065149010421,53.0714062774307],[6.10087493644271,53.0716712354474],[6.10091082982487,53.0716936039203],[6.10165087441291,53.0712041549161],[6.10204994718318,53.0709349338005],[6.10263143118855,53.0705789370018],[6.10311578125011,53.0702657538294],[6.10331686552072,53.0701314102389],[6.103326530575,53.070119463569],[6.10309137950343,53.0699829669055],[6.10184241586523,53.0692902201371],[6.10168497998891,53.0691984306747],[6.10092987659869,53.0694894453514],[6.09942873984307,53.070025028087]]]}")
+                    @"{ ""type"": ""Polygon"", ""coordinates"": [ [ [ 3.40843828875524, 50.638966444680605 ], [ 3.408953272886064, 50.639197789621612 ], [ 3.409242951459603, 50.639469958681836 ], [ 3.409328782148028, 50.639612846807708 ], [ 3.409457528180712, 50.639789755314411 ], [ 3.409639918393741, 50.640014292074966 ], [ 3.409833037442765, 50.640211611372706 ], [ 3.410069071836049, 50.640395321698435 ], [ 3.410380208081761, 50.640572227259661 ], [ 3.410605513638958, 50.640715112034222 ], [ 3.411925160474145, 50.641177783561204 ], [ 3.411935889310142, 50.640728720085136 ], [ 3.412590348309737, 50.63948356709389 ], [ 3.413244807309242, 50.638224772339846 ], [ 3.413400375432099, 50.637901562841307 ], [ 3.413539850300779, 50.637449065809889 ], [ 3.413475477284437, 50.637418445552932 ], [ 3.40999396998362, 50.637449065810451 ], [ 3.409940325803365, 50.638102293212661 ], [ 3.409575545377398, 50.638483338338325 ], [ 3.409060561246574, 50.638707881340494 ], [ 3.40843828875524, 50.638966444680605 ] ] ] }")
             };
 
             return await _farmmapsApiService.CreateItemAsync(cropfieldItemRequest);
         }
 
+        /// <summary>
+        /// Calculates TargetN, makes the assumption the cropfield and user.input(targetn) item have the same parent
+        /// </summary>
+        /// <param name="cropfieldItem">The cropfield to base the calculations on</param>
+        /// <param name="targetYield">The target yield input for the TargetN calculation</param>
+        /// <returns>The TargetN</returns>
         private async Task<double> CalculateTargetN(Item cropfieldItem, int targetYield)
         {
             var targetNItems = await
@@ -99,8 +129,6 @@ namespace FarmmapsApiSamples
                 targetNItem = targetNItems[0];
             }
 
-            _logger.LogInformation($"Calculating targetN with targetYield: {targetYield}");
-            
             var nbsTargetNRequest = new TaskRequest {TaskType = VRANBS_TASK};
             nbsTargetNRequest.attributes["operation"] = "targetn";
             nbsTargetNRequest.attributes["inputCode"] = targetNItem.Code;
@@ -111,12 +139,18 @@ namespace FarmmapsApiSamples
             
             await PollTask(TimeSpan.FromSeconds(3), async (tokenSource) =>
             {
-                var itemTask = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
+                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
-
+                if (itemTaskStatus.State != ItemTaskState.Processing && itemTaskStatus.State != ItemTaskState.Scheduled)
-                if (itemTask.State != ItemTaskState.Processing && itemTask.State != ItemTaskState.Scheduled)
                     tokenSource.Cancel();
             });
 
+            var itemTask = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
+            if(itemTask.State == ItemTaskState.Error)
+            {
+                _logger.LogError($"Something went wrong with task execution: {itemTask.Message}");
+                return 0;
+            }
+            
             var item = await _farmmapsApiService.GetItemAsync(targetNItem.Code);
             if (item.Data.ContainsKey("TargetN"))
                 return item.Data["TargetN"].Value<double>();
@@ -124,6 +158,44 @@ namespace FarmmapsApiSamples
             return 0;
         }
 
+        private async Task<Item> CalculateNitrogenMap(Item cropfieldItem, Item inputItem, double targetN)
+        {
+            var nbsNitrogenRequest = new TaskRequest {TaskType = VRANBS_TASK};
+            nbsNitrogenRequest.attributes["operation"] = "nitrogen";
+            nbsNitrogenRequest.attributes["inputCode"] = inputItem.Code;
+            nbsNitrogenRequest.attributes["inputType"] = "irmi";
+            nbsNitrogenRequest.attributes["targetN"] = targetN.ToString(CultureInfo.InvariantCulture);
+            
+            string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(cropfieldItem.Code, nbsNitrogenRequest);
+            
+            await PollTask(TimeSpan.FromSeconds(5), async (tokenSource) =>
+            {
+                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
+                if (itemTaskStatus.State != ItemTaskState.Processing && itemTaskStatus.State != ItemTaskState.Scheduled)
+                    tokenSource.Cancel();
+            });
+            
+            var itemTask = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
+            if(itemTask.State == ItemTaskState.Error)
+            {
+                _logger.LogError($"Something went wrong with task execution: {itemTask.Message}");
+                return null;
+            }
+            
+            var geotiffItems = await
+                _farmmapsApiService.GetItemChildrenAsync(cropfieldItem.Code, GEOTIFF_ITEMTYPE);
+
+            // how to uniquely know which item is really created!?
+            var nitrogenItem = geotiffItems.SingleOrDefault(i => i.Name.Contains("nitrogen"));
+            if (nitrogenItem == null)
+            {
+                _logger.LogError("Could not find the nitrogen geotiff child item under cropfield");
+                return null;
+            }
+
+            return nitrogenItem;
+        }
+
         private ItemRequest CreateTargetNItemRequest(string parentItemCode)
         {
             return new ItemRequest()

FarmmapsApiSamples/appsettings.json

@@ -1,6 +1,7 @@
 {
   "Authority": "https://accounts.farmmaps.awtest.nl/",
-  "Endpoint": "https://farmmaps.awtest.nl/api/v1/",
+  "Endpoint": "http://localhost:8083",
+  "BasePath": "api/v1",
   "DiscoveryEndpointUrl": "https://accounts.farmmaps.awtest.nl/.well-known/openid-configuration",
   "RedirectUri": "http://example.nl/api",
   "ClientId": "",