New: Optional directory setting for Aria2

(cherry picked from commit fd17df0dd03a5feb088c3241a247eac20f0e8c6c)

Closes #4449

src/NzbDrone.Common/Http/XmlRpcRequestBuilder.cs

@@ -92,6 +92,10 @@ namespace NzbDrone.Common.Http
             {
                 data = new XElement("base64", Convert.ToBase64String(bytes));
             }
+            else if (value is Dictionary<string, string> d)
+            {
+                data = new XElement("struct", d.Select(p => new XElement("member", new XElement("name", p.Key), new XElement("value", p.Value))));
+            }
             else
             {
                 throw new InvalidOperationException($"Unhandled argument type {value.GetType().Name}");

src/NzbDrone.Core/Download/Clients/Aria2/Aria2Proxy.cs

@@ -2,6 +2,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Xml.Linq;
 using System.Xml.XPath;
+using NzbDrone.Common.Extensions;
 using NzbDrone.Common.Http;
 using NzbDrone.Core.Download.Extensions;
 
@@ -97,8 +98,14 @@ namespace NzbDrone.Core.Download.Clients.Aria2
 
         public string AddMagnet(Aria2Settings settings, string magnet)
         {
-            var response = ExecuteRequest(settings, "aria2.addUri", GetToken(settings), new List<string> { magnet });
+            var options = new Dictionary<string, string>();
 
+            if (settings.Directory.IsNotNullOrWhiteSpace())
+            {
+                options.Add("dir", settings.Directory);
+            }
+
+            var response = ExecuteRequest(settings, "aria2.addUri", GetToken(settings), new List<string> { magnet }, options);
             var gid = response.GetStringResponse();
 
             return gid;
@@ -106,8 +113,16 @@ namespace NzbDrone.Core.Download.Clients.Aria2
 
         public string AddTorrent(Aria2Settings settings, byte[] torrent)
         {
-            var response = ExecuteRequest(settings, "aria2.addTorrent", GetToken(settings), torrent);
+            // Aria2's second parameter is an array of URIs and needs to be sent if options are provided, this satisfies that requirement.
+            var emptyListOfUris = new List<string>();
+            var options = new Dictionary<string, string>();
+
+            if (settings.Directory.IsNotNullOrWhiteSpace())
+            {
+                options.Add("dir", settings.Directory);
+            }
 
+            var response = ExecuteRequest(settings, "aria2.addTorrent", GetToken(settings), torrent, emptyListOfUris, options);
             var gid = response.GetStringResponse();
 
             return gid;

src/NzbDrone.Core/Download/Clients/Aria2/Aria2Settings.cs

@@ -41,6 +41,9 @@ namespace NzbDrone.Core.Download.Clients.Aria2
         [FieldDefinition(4, Label = "Secret token", Type = FieldType.Password, Privacy = PrivacyLevel.Password)]
         public string SecretToken { get; set; }
 
+        [FieldDefinition(5, Label = "Directory", Type = FieldType.Textbox, HelpText = "DownloadClientAriaSettingsDirectoryHelpText")]
+        public string Directory { get; set; }
+
         public NzbDroneValidationResult Validate()
         {
                 return new NzbDroneValidationResult(Validator.Validate(this));

src/NzbDrone.Core/Localization/Core/en.json

@@ -336,6 +336,7 @@
   "Donations": "Donations",
   "DoneEditingGroups": "Done Editing Groups",
   "DownloadClient": "Download Client",
+  "DownloadClientAriaSettingsDirectoryHelpText": "Optional location to put downloads in, leave blank to use the default Aria2 location",
   "DownloadClientCheckDownloadingToRoot": "Download client {0} places downloads in the root folder {1}. You should not download to a root folder.",
   "DownloadClientCheckNoneAvailableMessage": "No download client is available",
   "DownloadClientCheckUnableToCommunicateMessage": "Unable to communicate with {0}.",