[SOLVED] error when invoking start and stop a resource access

[sbhamad]

Thanks for this great plugin. I however get an error whenever i invoke (start or stop) resource access methods prior to using the resource.

i successfully get a bookmark, and i am certain that the file i pass to the

await _secureBookmarksInstance.startAccessingSecurityScopedResource(file);

method is not null.

i also made sure to add the following entitlements to both debug and release .entitlements

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>com.apple.security.app-sandbox</key>
	<true/>
	<key>com.apple.security.cs.allow-jit</key>
	<true/>
	<key>com.apple.security.network.server</key>
	<true/>
	<key>com.apple.security.network.client</key>
	<true/>
	<key>com.apple.security.files.bookmarks.app-scope</key>
	<true/>
	<key>com.apple.security.device.usb</key>
	<true/>

</dict>
</plist>

the error is:

[ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: PlatformException(InvalidArguments, expected file argument to be string., null, null)
#0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:607:7)
#1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:167:18)

#2 SecureBookmarks.startAccessingSecurityScopedResource (package:macos_secure_bookmarks/macos_secure_bookmarks.dart:39:12)

#3 _MyHomePageState._requestAccessToDirectory (package:cc_macos/main.dart:177:5)

[hpoul]

Are you passing in the file object or the bookmark id as string?

[sbhamad]

as the method signature requires a File object, then i am passing a File object to the

await _secureBookmarksInstance.startAccessingSecurityScopedResource(file);

method, which in turn, by looking at its implementation code, derives the path from the file File object with file.absolute.path.

even if i wanted to pass the bookmark, i couldn't because of the method signature.

  /// Allows you to access the given file. (which was previously stored
  /// as security aware bookmark).
  /// You should call [stopAccessingSecurityScopedResource] afterwards.
  Future<bool> startAccessingSecurityScopedResource(File file) async {
    return await _channel.invokeMethod(
        'startAccessingSecurityScopedResource', {'file': file.absolute.path});
  }

maybe the problem is on the native side? because the method of obtaining a bookmark, which is identical in signature, successfully returns the bookmark String when i pass it THE SAME file File object.

look at the bookmark method having an identical signature:

  /// Create a security aware bookmark for the given [file].
  Future<String> bookmark(File file) async {
    return await _channel
        .invokeMethod('bookmarkData', {'file': file.absolute.path});
  }

[hpoul]

Okay the error message is pretty bogus.. it has been a long time since i last looked at it 🤷‍♂️
Can you paste your whole code you use.. also the whole log including the native debug output, there are a few print statements which should be visible in the log output

[sbhamad]

Turns out, you must resolve the bookmark first to obtain the file object, then you must pass that same resolved file object to the:

  /// Allows you to access the given file. (which was previously stored
  /// as security aware bookmark).
  /// You should call [stopAccessingSecurityScopedResource] afterwards.
  Future<bool> startAccessingSecurityScopedResource(File file) async {
    return await _channel.invokeMethod(
        'startAccessingSecurityScopedResource', {'file': file.absolute.path});
  }

I also think we should update the method signature to accept a FileSystemEntity object instead of a File object:

  Future<bool> startAccessingSecurityScopedResource(FileSystemEntity file) async {
    return await _channel.invokeMethod(
        'startAccessingSecurityScopedResource', {'file': file.absolute.path});
  }

This enables passing both Directory and File objects. It works for me, i modified the signature locally and it works since the underlying invoked method is only interested in the absolute path of the FileSystemEntity object.