Add basic ability to flag duplicate levels (#753)

* Add the basics for duplicate level flagging

* Use this.BadRequest instead of StatusCode(500)

* Remove redundant slot creator check

* Include creator entity

* Redirect back to slot page for unauthenticated reqs

* Check if reporter = level creator on server side

* A few formatting nitpicks with the webhook

* Move external url config to a shorter var

* Change duplicate flag button icon to a flag

* Remove accidental dollar sign

Co-authored-by: Josh <josh@slendy.pw>

* Remove another accidental dollar sign

Co-authored-by: Josh <josh@slendy.pw>

* Three dollar signs... I'm blind

Co-authored-by: Josh <josh@slendy.pw>

* Update ProjectLighthouse.Servers.Website/Controllers/Moderator/ModerationSlotController.cs

Co-authored-by: Josh <josh@slendy.pw>

---------

Co-authored-by: Josh <josh@slendy.pw>

ProjectLighthouse.Servers.Website/Controllers/Moderator/ModerationSlotController.cs

@@ -68,4 +68,27 @@ public class ModerationSlotController : ControllerBase
 
         return this.Redirect("~/slots/0");
     }
+
+    [HttpGet("flag")]
+    public async Task<IActionResult> FlagLevel([FromRoute] int id)
+    {
+        UserEntity? user = this.database.UserFromWebRequest(this.Request);
+        if (user == null) return this.Redirect($"~/slot/{id}");
+
+        SlotEntity? slot = await this.database.Slots.Include(s => s.Creator).FirstOrDefaultAsync(s => s.SlotId == id);
+        if (slot == null) return this.BadRequest();
+        if (slot.CreatorId == user.UserId) return this.Redirect($"~/slot/{slot.SlotId}");
+
+        string externalUrl = ServerConfiguration.Instance.ExternalUrl;
+
+        await WebhookHelper.SendWebhook(title: "New duplicate level flag",
+            description: @$"Level [**{slot.Name}**]({externalUrl}/slot/{slot.SlotId}) has been flagged as a duplicate level.
+                            
+                            > **Reporter:** [{user.Username}]({externalUrl}/user/{user.UserId})
+                            > **Offender:** [{slot.Creator!.Username}]({externalUrl}/user/{slot.CreatorId})
+                            > **Level Hash:** {slot.RootLevel}",
+            dest: WebhookHelper.WebhookDestination.Moderation);
+
+        return this.Redirect($"~/slot/{slot.SlotId}");
+    }
 }

ProjectLighthouse.Servers.Website/Pages/Partials/SlotCardPartial.cshtml

@@ -104,12 +104,20 @@
     </div>
     <div class="cardButtons">
             <br>
-            @if (user != null && !mini && (user.IsModerator || user.UserId == Model.CreatorId))
+            @if (user != null && !mini && (user.IsModerator || Model.CreatorId == user.UserId))
             {
                 <a class="ui blue tiny button" href="/slot/@Model.SlotId/settings" title="Settings">
                     <i class="cog icon" style="margin: 0"></i>
                 </a>
             }
+            
+            @if (user != null && !mini && (user.UserId != Model.CreatorId))
+            {
+                <a class="ui red tiny button" href="/moderation/slot/@Model.SlotId/flag" title="Flag As Duplicate"
+                    onclick='return confirm("Are you sure you want to flag this level as a duplicate? False reports may result in punishment.")'>
+                    <i class="flag icon" style="margin: 0"></i>
+                </a>
+            }
         </div>
     <div class="cardButtons" style="margin-left: 0">
         <br>