[FA-27] Bookmark implementation

FictionArchive.Service.UserNovelDataService/GraphQL/Query.cs

@@ -1,6 +1,45 @@
+using System.Security.Claims;
+using FictionArchive.Service.UserNovelDataService.Models.DTOs;
+using FictionArchive.Service.UserNovelDataService.Services;
+using HotChocolate.Authorization;
+using Microsoft.EntityFrameworkCore;
+
 namespace FictionArchive.Service.UserNovelDataService.GraphQL;
 
 public class Query
 {
-    
-}
+    [Authorize]
+    public async Task<IQueryable<BookmarkDto>> GetBookmarks(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        uint novelId)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            return new List<BookmarkDto>().AsQueryable();
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new List<BookmarkDto>().AsQueryable();
+        }
+
+        return dbContext.Bookmarks
+            .AsNoTracking()
+            .Where(b => b.UserId == user.Id && b.NovelId == novelId)
+            .OrderByDescending(b => b.CreatedTime)
+            .Select(b => new BookmarkDto
+            {
+                Id = b.Id,
+                ChapterId = b.ChapterId,
+                NovelId = b.NovelId,
+                Description = b.Description,
+                CreatedTime = b.CreatedTime
+            });
+    }
+}