Added file type filtering to file selection dialogs (#442)

app/MindWork AI Studio/Components/ReadPDFContent.razor.cs

@@ -1,3 +1,4 @@
+using AIStudio.Tools.Rust;
 using AIStudio.Tools.Services;
 
 using Microsoft.AspNetCore.Components;
@@ -17,12 +18,9 @@ public partial class ReadPDFContent : MSGComponentBase
     
     private async Task SelectFile()
     {
-        var pdfFile = await this.RustService.SelectFile(T("Select PDF file"));
+        var pdfFile = await this.RustService.SelectFile(T("Select PDF file"), FileTypeFilter.PDF);
         if (pdfFile.UserCancelled)
             return;
-
-        if (!pdfFile.SelectedFilePath.EndsWith(".pdf", StringComparison.OrdinalIgnoreCase))
-            return;
         
         if(!File.Exists(pdfFile.SelectedFilePath))
             return;

app/MindWork AI Studio/Components/SelectFile.razor.cs

@@ -1,4 +1,5 @@
 using AIStudio.Settings;
+using AIStudio.Tools.Rust;
 using AIStudio.Tools.Services;
 
 using Microsoft.AspNetCore.Components;
@@ -22,6 +23,9 @@ public partial class SelectFile : ComponentBase
     [Parameter]
     public string FileDialogTitle { get; set; } = "Select File";
     
+    [Parameter]
+    public FileTypeFilter? Filter { get; set; }
+    
     [Parameter]
     public Func<string, string?> Validation { get; set; } = _ => null;
     
@@ -55,7 +59,7 @@ public partial class SelectFile : ComponentBase
 
     private async Task OpenFileDialog()
     {
-        var response = await this.RustService.SelectFile(this.FileDialogTitle, string.IsNullOrWhiteSpace(this.File) ? null : this.File);
+        var response = await this.RustService.SelectFile(this.FileDialogTitle, this.Filter, string.IsNullOrWhiteSpace(this.File) ? null : this.File);
         this.Logger.LogInformation($"The user selected the file '{response.SelectedFilePath}'.");
 
         if (!response.UserCancelled)

app/MindWork AI Studio/Tools/Rust/FileTypeFilter.cs

@@ -0,0 +1,18 @@
+// ReSharper disable NotAccessedPositionalProperty.Global
+namespace AIStudio.Tools.Rust;
+
+/// <summary>
+/// Represents a file type filter for file selection dialogs.
+/// </summary>
+/// <param name="FilterName">The name of the filter.</param>
+/// <param name="FilterExtensions">The file extensions associated with the filter.</param>
+public readonly record struct FileTypeFilter(string FilterName, string[] FilterExtensions)
+{
+    public static FileTypeFilter PDF => new("PDF Files", ["pdf"]);
+    
+    public static FileTypeFilter Text => new("Text Files", ["txt", "md"]);
+    
+    public static FileTypeFilter AllOffice => new("All Office Files", ["docx", "xlsx", "pptx", "doc", "xls", "ppt", "pdf"]);
+    
+    public static FileTypeFilter AllImages => new("All Image Files", ["jpg", "jpeg", "png", "gif", "bmp", "tiff"]);
+}

app/MindWork AI Studio/Tools/Rust/SelectFileOptions.cs

@@ -0,0 +1,10 @@
+namespace AIStudio.Tools.Rust;
+
+public sealed class SelectFileOptions
+{
+    public required string Title { get; init; }
+    
+    public PreviousFile? PreviousFile { get; init; }
+
+    public FileTypeFilter? Filter { get; init; }
+}

app/MindWork AI Studio/Tools/Services/RustService.FileSystem.cs

@@ -17,10 +17,16 @@ public sealed partial class RustService
         return await result.Content.ReadFromJsonAsync<DirectorySelectionResponse>(this.jsonRustSerializerOptions);
     }
     
-    public async Task<FileSelectionResponse> SelectFile(string title, string? initialFile = null)
+    public async Task<FileSelectionResponse> SelectFile(string title, FileTypeFilter? filter = null, string? initialFile = null)
     {
-        PreviousFile? previousFile = initialFile is null ? null : new (initialFile);
-        var result = await this.http.PostAsJsonAsync($"/select/file?title={title}", previousFile, this.jsonRustSerializerOptions);
+        var payload = new SelectFileOptions
+        {
+            Title = title,
+            PreviousFile = initialFile is null ? null : new (initialFile),
+            Filter = filter
+        };
+        
+        var result = await this.http.PostAsJsonAsync("/select/file", payload, this.jsonRustSerializerOptions);
         if (!result.IsSuccessStatusCode)
         {
             this.logger!.LogError($"Failed to select a file: '{result.StatusCode}'");

runtime/src/app_window.rs

@@ -267,6 +267,19 @@ pub struct PreviousDirectory {
     path: String,
 }
 
+#[derive(Clone, Deserialize)]
+pub struct FileTypeFilter {
+    filter_name: String,
+    filter_extensions: Vec<String>,
+}
+
+#[derive(Clone, Deserialize)]
+pub struct SelectFileOptions {
+    title: String,
+    previous_file: Option<PreviousFile>,
+    filter: Option<FileTypeFilter>,
+}
+
 #[derive(Serialize)]
 pub struct DirectorySelectionResponse {
     user_cancelled: bool,
@@ -274,24 +287,36 @@ pub struct DirectorySelectionResponse {
 }
 
 /// Let the user select a file.
-#[post("/select/file?<title>", data = "<previous_file>")]
-pub fn select_file(_token: APIToken, title: &str, previous_file: Option<Json<PreviousFile>>) -> Json<FileSelectionResponse> {
-    let file_path = match previous_file {
-        Some(previous) => {
-            let previous_path = previous.file_path.as_str();
-            FileDialogBuilder::new()
-                .set_title(title)
-                .set_directory(previous_path)
-                .pick_file()
+#[post("/select/file", data = "<payload>")]
+pub fn select_file(_token: APIToken, payload: Json<SelectFileOptions>) -> Json<FileSelectionResponse> {
+
+    // Create a new file dialog builder:
+    let file_dialog = FileDialogBuilder::new();
+
+    // Set the title of the file dialog:
+    let file_dialog = file_dialog.set_title(&payload.title);
+
+    // Set the file type filter if provided:
+    let file_dialog = match &payload.filter {
+        Some(filter) => {
+            file_dialog.add_filter(&filter.filter_name, &filter.filter_extensions.iter().map(|s| s.as_str()).collect::<Vec<&str>>())
         },
 
-        None => {
-            FileDialogBuilder::new()
-                .set_title(title)
-                .pick_file()
-        },
+        None => file_dialog,
     };
 
+    // Set the previous file path if provided:
+    let file_dialog = match &payload.previous_file {
+        Some(previous) => {
+            let previous_path = previous.file_path.as_str();
+            file_dialog.set_directory(previous_path)
+        },
+
+        None => file_dialog,
+    };
+
+    // Show the file dialog and get the selected file path:
+    let file_path = file_dialog.pick_file();
     match file_path {
         Some(path) => {
             info!("User selected file: {path:?}");