implement `AddBuddy and ApproveBuddy`

src/Controllers/Common/ContentController.cs

@@ -24,6 +24,7 @@ public class ContentController : Controller {
     private DisplayNamesService displayNamesService;
     private NeighborhoodService neighborhoodService;
     private WorldIdService worldIdService;
+    private BuddyService buddyService;
     private Random random = new Random();
     private readonly IOptions<ApiServerConfig> config;
     
@@ -40,6 +41,7 @@ public class ContentController : Controller {
         DisplayNamesService displayNamesService,
         NeighborhoodService neighborhoodService,
         WorldIdService worldIdService,
+        BuddyService buddyService,
         IOptions<ApiServerConfig> config
     ) {
         this.ctx = ctx;
@@ -54,6 +56,7 @@ public class ContentController : Controller {
         this.displayNamesService = displayNamesService;
         this.neighborhoodService = neighborhoodService;
         this.worldIdService = worldIdService;
+        this.buddyService = buddyService;
         this.config = config;
     }
 
@@ -1142,12 +1145,40 @@ public class ContentController : Controller {
         return Ok(taskResult);
     }
 
+    [HttpPost]
+    [Produces("application/xml")]
+    [Route("ContentWebService.asmx/AddBuddy")]
+    [VikingSession]
+    public IActionResult AddBuddy(Viking viking, [FromForm] Guid buddyUserID)
+    {
+        // get buddy
+        Viking? buddyViking = ctx.Vikings.FirstOrDefault(e => e.Uid == buddyUserID);
+
+        if (buddyViking != null)
+            return Ok(buddyService.CreateBuddyRelation(viking, buddyViking));
+        else return Ok(new BuddyActionResult{ Result = BuddyActionResultType.InvalidFriendCode });
+    }
+
+    [HttpPost]
+    [Produces("application/xml")]
+    [Route("ContentWebService.asmx/ApproveBuddy")]
+    [VikingSession]
+    public IActionResult ApproveBuddy(Viking viking, [FromForm] Guid buddyUserID)
+    {
+        // get buddy
+        Viking? buddyViking = ctx.Vikings.FirstOrDefault(e => e.Uid == buddyUserID);
+
+        if (buddyViking != null)
+            return Ok(buddyService.UpdateBuddyRelation(viking, buddyViking, BuddyStatus.Approved, BuddyStatus.Approved));
+        else return Ok(new BuddyActionResult{ Result = BuddyActionResultType.InvalidFriendCode });
+    }
+
     [HttpPost]
     [Produces("application/xml")]
     [Route("ContentWebService.asmx/GetBuddyList")]
-    public IActionResult GetBuddyList() {
+    [VikingSession]
-        // TODO: this is a placeholder
+    public IActionResult GetBuddyList(Viking viking) {
-        return Ok(new BuddyList { Buddy = new Schema.Buddy[0] });
+        return Ok(buddyService.ConstructBuddyList(viking));
     }
 
     [HttpPost]

src/Program.cs

@@ -42,6 +42,7 @@ builder.Services.AddScoped<ProfileService>();
 builder.Services.AddScoped<NeighborhoodService>();
 builder.Services.AddScoped<ModerationService>();
 builder.Services.AddScoped<MessagingService>();
+builder.Services.AddScoped<BuddyService>();
 
 bool assetServer = builder.Configuration.GetSection("AssetServer").GetValue<bool>("Enabled");
 string assetIP = builder.Configuration.GetSection("AssetServer").GetValue<string>("ListenIP");

src/Services/BuddyService.cs

@@ -59,6 +59,29 @@ public class BuddyService
         };
     }
 
+    public BuddyActionResult UpdateBuddyRelation(Viking viking, Viking buddyViking, BuddyStatus buddyStatus1, BuddyStatus buddyStatus2)
+    {
+        // find relation
+        Model.Buddy? buddy = ctx.Buddies.Where(e => e.VikingId == viking.Id)
+            .FirstOrDefault(e => e.BuddyVikingId == buddyViking.Id);
+        
+        if (buddy != null)
+        {
+            // update it
+            buddy.BuddyStatus1 = buddyStatus1;
+            buddy.BuddyStatus2 = buddyStatus2;
+            ctx.SaveChanges();
+
+            // return result
+            return new BuddyActionResult
+            {
+                Status = buddy.BuddyStatus1,
+                Result = BuddyActionResultType.Success,
+                BuddyUserID = buddyViking.Uid.ToString()
+            };
+        } else return new BuddyActionResult { Result = BuddyActionResultType.Unknown };
+    }
+
     public void RemoveBuddy(Viking viking, Guid buddyUid)
     {
         // find buddy viking