Added Relation functions:

* GetRelationshipsAsync()
 * AddFriendAsync(ulong)
 * BlockUserAsync(ulong)
 * RemoveRelationshipAsync(ulong)

Discord.Net.sln

@@ -47,16 +47,16 @@ Global
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 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

src/Discord.Net.Core/API/DiscordRestApiClient.cs

@@ -242,7 +242,7 @@ namespace Discord.API
         internal Task<TResponse> SendMultipartAsync<TResponse>(string method, Expression<Func<string>> endpointExpr, IReadOnlyDictionary<string, object> multipartArgs, BucketIds ids,
              ClientBucketType clientBucket = ClientBucketType.Unbucketed, RequestOptions options = null, [CallerMemberName] string funcName = null)
             => SendMultipartAsync<TResponse>(method, GetEndpoint(endpointExpr), multipartArgs, GetBucketId(ids, endpointExpr, AuthTokenType, funcName), clientBucket, options);
-        public async Task<TResponse> SendMultipartAsync<TResponse>(string method, string endpoint, IReadOnlyDictionary<string, object> multipartArgs, 
+        public async Task<TResponse> SendMultipartAsync<TResponse>(string method, string endpoint, IReadOnlyDictionary<string, object> multipartArgs,
             string bucketId = null, ClientBucketType clientBucket = ClientBucketType.Unbucketed, RequestOptions options = null)
         {
             options = options ?? new RequestOptions();
@@ -386,7 +386,7 @@ namespace Discord.API
                     break;
             }
         }
-        
+
         //Channel Messages
         public async Task<Message> GetChannelMessageAsync(ulong channelId, ulong messageId, RequestOptions options = null)
         {
@@ -622,7 +622,7 @@ namespace Discord.API
             Preconditions.NotNullOrWhitespace(args.Name, nameof(args.Name));
             Preconditions.NotNullOrWhitespace(args.RegionId, nameof(args.RegionId));
             options = RequestOptions.CreateOrClone(options);
-            
+
             return await SendJsonAsync<Guild>("POST", () => "guilds", args, new BucketIds(), options: options).ConfigureAwait(false);
         }
         public async Task<Guild> DeleteGuildAsync(ulong guildId, RequestOptions options = null)
@@ -830,14 +830,14 @@ namespace Discord.API
         {
             Preconditions.NotNullOrEmpty(inviteId, nameof(inviteId));
             options = RequestOptions.CreateOrClone(options);
-            
+
             return await SendAsync<Invite>("DELETE", () => $"invites/{inviteId}", new BucketIds(), options: options).ConfigureAwait(false);
         }
         public async Task AcceptInviteAsync(string inviteId, RequestOptions options = null)
         {
             Preconditions.NotNullOrEmpty(inviteId, nameof(inviteId));
             options = RequestOptions.CreateOrClone(options);
-            
+
             await SendAsync("POST", () => $"invites/{inviteId}", new BucketIds(), options: options).ConfigureAwait(false);
         }
 
@@ -972,6 +972,34 @@ namespace Discord.API
             }
             catch (HttpException ex) when (ex.StatusCode == HttpStatusCode.NotFound) { return null; }
         }
+        
+        //Relationships
+        public async Task<IReadOnlyCollection<Relationship>> GetRelationshipsAsync(RequestOptions options = null)
+        {
+            options = RequestOptions.CreateOrClone(options);
+            return await SendAsync<IReadOnlyCollection<Relationship>>("GET", () => "users/@me/relationships", new BucketIds(), options: options).ConfigureAwait(false);
+        }
+        public async Task AddFriendAsync(ulong userId, RequestOptions options = null)
+        {
+            Preconditions.NotEqual(userId, 0, nameof(userId));
+            options = RequestOptions.CreateOrClone(options);
+
+            await SendJsonAsync("PUT", () => $"users/@me/relationships/{userId}", new object(), new BucketIds(), options: options).ConfigureAwait(false);
+        }
+        public async Task BlockUserAsync(ulong userId, RequestOptions options = null)
+        {
+            Preconditions.NotEqual(userId, 0, nameof(userId));
+            options = RequestOptions.CreateOrClone(options);
+
+            await SendJsonAsync("PUT", () => $"users/@me/relationships/{userId}", new BlockUserParams(), new BucketIds(), options: options).ConfigureAwait(false);
+        }
+        public async Task RemoveRelationshipAsync(ulong userId, RequestOptions options = null)
+        {
+            Preconditions.NotEqual(userId, 0, nameof(userId));
+            options = RequestOptions.CreateOrClone(options);
+
+            await SendAsync("DELETE", () => $"users/@me/relationships/{userId}", new BucketIds(), options: options).ConfigureAwait(false);
+        }
 
         //Current User/DMs
         public async Task<User> GetMyUserAsync(RequestOptions options = null)
@@ -1137,7 +1165,7 @@ namespace Discord.API
                     int argId = int.Parse(format.Substring(leftIndex + 1, rightIndex - leftIndex - 1));
                     string fieldName = GetFieldName(methodArgs[argId + 1]);
                     int? mappedId;
-                    
+
                     mappedId = BucketIds.GetIndex(fieldName);
                     if(!mappedId.HasValue && rightIndex != endIndex && format.Length > rightIndex + 1 && format[rightIndex + 1] == '/') //Ignore the next slash
                         rightIndex++;

src/Discord.Net.Core/API/Rest/BlockUserParams.cs

@@ -0,0 +1,11 @@
+using Newtonsoft.Json;
+
+namespace Discord.API.Rest
+{
+    [JsonObject(MemberSerialization = MemberSerialization.OptIn)]
+    public class BlockUserParams
+    {
+        [JsonProperty("type")]
+        public RelationshipType Type { get; } = RelationshipType.Blocked;
+    }
+}

src/Discord.Net.Core/IDiscordClient.cs

@@ -25,12 +25,17 @@ namespace Discord
         Task<IGuild> GetGuildAsync(ulong id, CacheMode mode = CacheMode.AllowDownload);
         Task<IReadOnlyCollection<IGuild>> GetGuildsAsync(CacheMode mode = CacheMode.AllowDownload);
         Task<IGuild> CreateGuildAsync(string name, IVoiceRegion region, Stream jpegIcon = null);
-        
+
         Task<IInvite> GetInviteAsync(string inviteId);
 
         Task<IUser> GetUserAsync(ulong id, CacheMode mode = CacheMode.AllowDownload);
         Task<IUser> GetUserAsync(string username, string discriminator);
 
+        Task<IReadOnlyCollection<Relationship>> GetRelationshipsAsync();
+        Task RemoveRelationshipAsync(ulong userId);
+        Task AddFriendAsync(ulong userId);
+        Task BlockUserAsync(ulong userId);
+
         Task<IReadOnlyCollection<IVoiceRegion>> GetVoiceRegionsAsync();
         Task<IVoiceRegion> GetVoiceRegionAsync(string id);
     }

src/Discord.Net.Rest/BaseDiscordClient.cs

@@ -124,6 +124,11 @@ namespace Discord.Rest
         /// <inheritdoc />
         public void Dispose() => Dispose(true);
 
+        Task<IReadOnlyCollection<API.Relationship>> IDiscordClient.GetRelationshipsAsync() => ApiClient.GetRelationshipsAsync();
+        Task IDiscordClient.AddFriendAsync(ulong userId) => ApiClient.AddFriendAsync(userId);
+        Task IDiscordClient.BlockUserAsync(ulong userId) => ApiClient.BlockUserAsync(userId);
+        Task IDiscordClient.RemoveRelationshipAsync(ulong userId) => ApiClient.RemoveRelationshipAsync(userId);
+
         //IDiscordClient
         ConnectionState IDiscordClient.ConnectionState => ConnectionState.Disconnected;
         ISelfUser IDiscordClient.CurrentUser => CurrentUser;