1 files changed, 45 insertions, 0 deletions
diff --git a/BackEnd/Timeline/Services/User/Avatar/IUserAvatarService.cs b/BackEnd/Timeline/Services/User/Avatar/IUserAvatarService.cs
new file mode 100644
index 00000000..fda35aac
--- /dev/null
+++ b/BackEnd/Timeline/Services/User/Avatar/IUserAvatarService.cs
@@ -0,0 +1,45 @@
+using System;
+using System.Threading.Tasks;
+using Timeline.Helpers.Cache;
+using Timeline.Models;
+using Timeline.Services.Imaging;
+
+namespace Timeline.Services.User.Avatar
+{
+    public interface IUserAvatarService
+    {
+        /// <summary>
+        /// Get avatar digest of a user.
+        /// </summary>
+        /// <param name="userId">User id.</param>
+        /// <returns>The avatar digest.</returns>
+        /// <exception cref="UserNotExistException">Thrown when user does not exist.</exception>
+        Task<ICacheableDataDigest> GetAvatarDigest(long userId);
+
+        /// <summary>
+        /// Get avatar of a user. If the user has no avatar set, a default one is returned.
+        /// </summary>
+        /// <param name="userId">User id.</param>
+        /// <returns>The avatar.</returns>
+        /// <exception cref="UserNotExistException">Thrown when user does not exist.</exception>
+        Task<ByteData> GetAvatar(long userId);
+
+        /// <summary>
+        /// Set avatar for a user.
+        /// </summary>
+        /// <param name="userId">User id.</param>
+        /// <param name="avatar">The new avatar data.</param>
+        /// <returns>The digest of the avatar.</returns>
+        /// <exception cref="ArgumentNullException">Thrown if <paramref name="avatar"/> is null.</exception>
+        /// <exception cref="UserNotExistException">Thrown when user does not exist.</exception>
+        /// <exception cref="ImageException">Thrown if avatar is of bad format.</exception>
+        Task<ICacheableDataDigest> SetAvatar(long userId, ByteData avatar);
+
+        /// <summary>
+        /// Remove avatar of a user.
+        /// </summary>
+        /// <param name="userId">User id.</param>
+        /// <exception cref="UserNotExistException">Thrown when user does not exist.</exception>
+        Task DeleteAvatar(long userId);
+    }
+}