[file_selector] Fix unknown extensions on macOS (#4946)

Fixes a bug in the type lookup that would cause the dynamic `UTType` created for unknown extensions to not work as a save/open panel filter.

As incidental cleanup, removes test timeouts that shouldn't exist per Flutter policy.

Fixes flutter/flutter#134963

Author: stuartmorgan-g

packages/file_selector/file_selector_macos/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.9.3+3
+
+* Fixes handling of unknown file extensions on macOS 11+.
+
 ## 0.9.3+2
 
 * Adds pub topics to package metadata.

packages/file_selector/file_selector_macos/example/macos/RunnerTests/RunnerTests.swift

@@ -67,7 +67,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.openPanel)
     if let panel = panelController.openPanel {
       XCTAssertTrue(panel.canChooseFiles)
@@ -104,7 +104,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.openPanel)
     if let panel = panelController.openPanel {
       XCTAssertEqual(panel.directoryURL?.path, "/some/dir")
@@ -140,7 +140,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.openPanel)
   }
 
@@ -173,7 +173,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.openPanel)
     if let panel = panelController.openPanel {
       if #available(macOS 11.0, *) {
@@ -188,6 +188,51 @@ class exampleTests: XCTestCase {
     }
   }
 
+  func testFilterUnknownFileExtension() throws {
+    let panelController = TestPanelController()
+    let plugin = FileSelectorPlugin(
+      viewProvider: TestViewProvider(),
+      panelController: panelController)
+
+    let unknownExtension = "somenewextension"
+    let returnPath = "/foo/bar"
+    panelController.openURLs = [URL(fileURLWithPath: returnPath)]
+
+    let called = XCTestExpectation()
+    let options = OpenPanelOptions(
+      allowsMultipleSelection: true,
+      canChooseDirectories: false,
+      canChooseFiles: true,
+      baseOptions: SavePanelOptions(
+        allowedFileTypes: AllowedTypes(
+          extensions: [unknownExtension],
+          mimeTypes: [],
+          utis: [])))
+    plugin.displayOpenPanel(options: options) { result in
+      switch result {
+      case .success(let paths):
+        XCTAssertEqual(paths[0], returnPath)
+      case .failure(let error):
+        XCTFail("\(error)")
+      }
+      called.fulfill()
+    }
+
+    wait(for: [called])
+    XCTAssertNotNil(panelController.openPanel)
+    if let panel = panelController.openPanel {
+      if #available(macOS 11.0, *) {
+        XCTAssertEqual(panel.allowedContentTypes.count, 1)
+        XCTAssertEqual(panel.allowedContentTypes[0].preferredFilenameExtension, unknownExtension)
+        // If this isn't true, the dynamic type created for the extension won't work as a file
+        // extension filter.
+        XCTAssertTrue(panel.allowedContentTypes[0].conforms(to: UTType.data))
+      } else {
+        XCTAssertEqual(panel.allowedFileTypes, [unknownExtension])
+      }
+    }
+  }
+
   func testOpenWithFilterLegacy() throws {
     let panelController = TestPanelController()
     let plugin = FileSelectorPlugin(
@@ -218,7 +263,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.openPanel)
     if let panel = panelController.openPanel {
       // On the legacy path, the allowedFileTypes should be set directly.
@@ -257,7 +302,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.openPanel)
   }
 
@@ -282,7 +327,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.savePanel)
   }
 
@@ -309,7 +354,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.savePanel)
     if let panel = panelController.savePanel {
       XCTAssertEqual(panel.directoryURL?.path, "/some/dir")
@@ -335,7 +380,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.savePanel)
   }
 
@@ -364,7 +409,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.openPanel)
     if let panel = panelController.openPanel {
       XCTAssertTrue(panel.canChooseDirectories)
@@ -398,7 +443,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.openPanel)
   }
 
@@ -408,7 +453,7 @@ class exampleTests: XCTestCase {
       viewProvider: TestViewProvider(),
       panelController: panelController)
 
-    let returnPaths = ["/foo/bar", "/foo/test"];
+    let returnPaths = ["/foo/bar", "/foo/test"]
     panelController.openURLs = returnPaths.map({ path in URL(fileURLWithPath: path) })
 
     let called = XCTestExpectation()
@@ -427,7 +472,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.openPanel)
     if let panel = panelController.openPanel {
       XCTAssertTrue(panel.canChooseDirectories)
@@ -459,7 +504,7 @@ class exampleTests: XCTestCase {
       called.fulfill()
     }
 
-    wait(for: [called], timeout: 0.5)
+    wait(for: [called])
     XCTAssertNotNil(panelController.openPanel)
   }
 }

packages/file_selector/file_selector_macos/macos/Classes/FileSelectorPlugin.swift

@@ -105,12 +105,12 @@ public class FileSelectorPlugin: NSObject, FlutterPlugin, FileSelectorApi {
         // that via the types; see messages.dart and https://github.com/flutter/flutter/issues/97848
         allowedTypes.append(contentsOf: acceptedTypes.utis.compactMap({ UTType($0!) }))
         allowedTypes.append(
-          contentsOf: acceptedTypes.extensions.flatMap({
-            UTType.types(tag: $0!, tagClass: UTTagClass.filenameExtension, conformingTo: nil)
+          contentsOf: acceptedTypes.extensions.compactMap({
+            UTType.init(filenameExtension: $0!)
           }))
         allowedTypes.append(
-          contentsOf: acceptedTypes.mimeTypes.flatMap({
-            UTType.types(tag: $0!, tagClass: UTTagClass.mimeType, conformingTo: nil)
+          contentsOf: acceptedTypes.mimeTypes.compactMap({
+            UTType.init(mimeType: $0!)
           }))
         if !allowedTypes.isEmpty {
           panel.allowedContentTypes = allowedTypes

packages/file_selector/file_selector_macos/pubspec.yaml

@@ -2,7 +2,7 @@ name: file_selector_macos
 description: macOS implementation of the file_selector plugin.
 repository: https://github.com/flutter/packages/tree/main/packages/file_selector/file_selector_macos
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+file_selector%22
-version: 0.9.3+2
+version: 0.9.3+3
 
 environment:
   sdk: ">=2.19.0 <4.0.0"