Update path_provider

.gitignore

@@ -0,0 +1 @@
+.idea

path_provider/go.mod

@@ -3,6 +3,7 @@ module github.com/go-flutter-desktop/plugins/path_provider
 go 1.13
 
 require (
+	github.com/adrg/xdg v0.2.1
 	github.com/go-flutter-desktop/go-flutter v0.37.0
 	github.com/pkg/errors v0.9.1
 )

path_provider/go.sum

@@ -1,3 +1,5 @@
+github.com/adrg/xdg v0.2.1 h1:VSVdnH7cQ7V+B33qSJHTCRlNgra1607Q8PzEmnvb2Ic=
+github.com/adrg/xdg v0.2.1/go.mod h1:ZuOshBmzV4Ta+s23hdfFZnBsdzmoR3US0d7ErpqSbTQ=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=

path_provider/plugin.go

@@ -1,12 +1,14 @@
 package path_provider
 
 import (
-	"os"
 	"path/filepath"
 
+	"github.com/adrg/xdg"
+
+	"github.com/pkg/errors"
+
 	flutter "github.com/go-flutter-desktop/go-flutter"
 	"github.com/go-flutter-desktop/go-flutter/plugin"
-	"github.com/pkg/errors"
 )
 
 const channelName = "plugins.flutter.io/path_provider"
@@ -21,8 +23,6 @@ type PathProviderPlugin struct {
 	// this application. Note that the value must be valid as a cross-platform
 	// directory name.
 	ApplicationName string
-
-	userConfigFolder string
 }
 
 var _ flutter.Plugin = &PathProviderPlugin{} // compile-time type check
@@ -38,26 +38,42 @@ func (p *PathProviderPlugin) InitPlugin(messenger plugin.BinaryMessenger) error
 		return errors.New("PathProviderPlugin.ApplicationName must be set")
 	}
 
-	var err error
-	p.userConfigFolder, err = os.UserConfigDir()
-	if err != nil {
-		return errors.Wrap(err, "failed to resolve user config dir")
-	}
-
 	channel := plugin.NewMethodChannel(messenger, channelName, plugin.StandardMethodCodec{})
 	channel.HandleFunc("getTemporaryDirectory", p.handleTempDir)
-	channel.HandleFunc("getApplicationDocumentsDirectory", p.handleAppDir)
+	channel.HandleFunc("getApplicationSupportDirectory", p.handleAppSupportDir)
+	channel.HandleFunc("getLibraryDirectory", p.handleLibraryDir) // MacOS only
+	channel.HandleFunc("getApplicationDocumentsDirectory", p.handleAppDocumentsDir)
+	channel.HandleFunc("getStorageDirectory", p.returnError)           // Android only
+	channel.HandleFunc("getExternalCacheDirectories", p.returnError)   // Android only
+	channel.HandleFunc("getExternalStorageDirectories", p.returnError) // Android only
+	channel.HandleFunc("getDownloadsDirectory", p.handleDownloadsDir)
 	return nil
 }
 
+func (p *PathProviderPlugin) returnError(arguments interface{}) (reply interface{}, err error) {
+	return nil, errors.New("This channel is not supported")
+}
+
 func (p *PathProviderPlugin) handleTempDir(arguments interface{}) (reply interface{}, err error) {
-	cacheDir, err := os.UserCacheDir()
-	if err != nil {
-		return nil, err
-	}
-	return filepath.Join(cacheDir, p.VendorName, p.ApplicationName), nil
+	return filepath.Join(xdg.CacheHome, p.VendorName, p.ApplicationName), nil
+}
+
+func (p *PathProviderPlugin) handleAppSupportDir(arguments interface{}) (reply interface{}, err error) {
+	return filepath.Join(xdg.DataHome, p.VendorName, p.ApplicationName), nil
+}
+
+// handleLibraryDir is MacOS only and therefore hardcoded, as it is not specified in the XDG specifications
+func (p *PathProviderPlugin) handleLibraryDir(arguments interface{}) (reply interface{}, err error) {
+	return "/Library/", nil
+}
+
+func (p *PathProviderPlugin) handleAppDocumentsDir(arguments interface{}) (reply interface{}, err error) {
+	return filepath.Join(xdg.ConfigHome, p.VendorName, p.ApplicationName), nil
 }
 
-func (p *PathProviderPlugin) handleAppDir(arguments interface{}) (reply interface{}, err error) {
-	return filepath.Join(p.userConfigFolder, p.VendorName, p.ApplicationName), nil
+// handleDownloadsDir is from the flutter plugin side MacOS only
+// (https://github.com/flutter/plugins/blob/8819b219c5ca83a000ae482b9a51b7f1f421845b/packages/path_provider/path_provider_platform_interface/lib/src/method_channel_path_provider.dart#L82)
+// but should work out of the box once the restriction is not longer there
+func (p *PathProviderPlugin) handleDownloadsDir(arguments interface{}) (reply interface{}, err error) {
+	return xdg.UserDirs.Download, nil
 }