Disable browse button if archive file is missing

LANCommander/Components/InputArchiveFile.razor

@@ -1,6 +1,7 @@
 @using LANCommander.Models;
 @using System.IO.Compression;
 @inject ModalService ModalService
+@inject ArchiveService ArchiveService
 
 <Space Style="display: flex">
     <SpaceItem Style="flex-grow: 1">
@@ -8,7 +9,7 @@
     </SpaceItem>
     @if (ArchiveId != Guid.Empty) {
         <SpaceItem>
-            <Button OnClick="() => BrowseForFile()" Type="@ButtonType.Primary" Icon="@IconType.Outline.FolderOpen" />
+            <Button OnClick="() => BrowseForFile()" Type="@ButtonType.Primary" Icon="@IconType.Outline.FolderOpen" Disabled="!ArchiveExists" />
         </SpaceItem>
     }
 </Space>
@@ -20,6 +21,14 @@
     [Parameter] public string ArchiveBrowserTitle { get; set; } = "Choose File";
     [Parameter] public bool AllowDirectories { get; set; } = false;
 
+    bool ArchiveExists { get; set; } = false;
+
+    protected override async Task OnInitializedAsync()
+    {
+        if (ArchiveId != Guid.Empty)
+            ArchiveExists = await ArchiveService.Exists(ArchiveId);
+    }
+
     private async void BrowseForFile()
     {
         var modalOptions = new ModalOptions()

LANCommander/Services/ArchiveService.cs

@@ -88,6 +88,15 @@ namespace LANCommander.Services
             }
         }
 
+        public async Task<bool> Exists(Guid archiveId)
+        {
+            var archive = await Get(archiveId);
+
+            var path = GetArchiveFileLocation(archive);
+
+            return File.Exists(path);
+        }
+
         public async Task<IEnumerable<ZipArchiveEntry>> GetContents(Guid archiveId)
         {
             var archive = await Get(archiveId);