backend: adjust backends to have encoding parameter

Fixes #3761
Fixes #3836
Fixes #3841

backend/premiumizeme/premiumizeme.go

@@ -31,6 +31,7 @@ import (
 	"github.com/pkg/errors"
 	"github.com/rclone/rclone/backend/premiumizeme/api"
 	"github.com/rclone/rclone/fs"
+	"github.com/rclone/rclone/fs/config"
 	"github.com/rclone/rclone/fs/config/configmap"
 	"github.com/rclone/rclone/fs/config/configstruct"
 	"github.com/rclone/rclone/fs/config/obscure"
@@ -39,6 +40,7 @@ import (
 	"github.com/rclone/rclone/fs/fshttp"
 	"github.com/rclone/rclone/fs/hash"
 	"github.com/rclone/rclone/lib/dircache"
+	"github.com/rclone/rclone/lib/encoder"
 	"github.com/rclone/rclone/lib/oauthutil"
 	"github.com/rclone/rclone/lib/pacer"
 	"github.com/rclone/rclone/lib/random"
@@ -46,8 +48,6 @@ import (
 	"golang.org/x/oauth2"
 )
 
-const enc = encodings.PremiumizeMe
-
 const (
 	rcloneClientID              = "658922194"
 	rcloneEncryptedClientSecret = "B5YIvQoRIhcpAYs8HYeyjb9gK-ftmZEbqdh_gNfc4RgO9Q"
@@ -93,13 +93,19 @@ This is not normally used - use oauth instead.
 `,
 			Hide:    fs.OptionHideBoth,
 			Default: "",
+		}, {
+			Name:     config.ConfigEncoding,
+			Help:     config.ConfigEncodingHelp,
+			Advanced: true,
+			Default:  encodings.PremiumizeMe,
 		}},
 	})
 }
 
 // Options defines the configuration for this backend
 type Options struct {
-	APIKey string `config:"api_key"`
+	APIKey string               `config:"api_key"`
+	Enc    encoder.MultiEncoder `config:"encoding"`
 }
 
 // Fs represents a remote cloud storage system
@@ -364,7 +370,7 @@ func (f *Fs) CreateDir(ctx context.Context, pathID, leaf string) (newID string,
 		Path:       "/folder/create",
 		Parameters: f.baseParams(),
 		MultipartParams: url.Values{
-			"name":      {enc.FromStandardName(leaf)},
+			"name":      {f.opt.Enc.FromStandardName(leaf)},
 			"parent_id": {pathID},
 		},
 	}
@@ -429,7 +435,7 @@ func (f *Fs) listAll(ctx context.Context, dirID string, directoriesOnly bool, fi
 			fs.Debugf(f, "Ignoring %q - unknown type %q", item.Name, item.Type)
 			continue
 		}
-		item.Name = enc.ToStandardName(item.Name)
+		item.Name = f.opt.Enc.ToStandardName(item.Name)
 		if fn(item) {
 			found = true
 			break
@@ -637,8 +643,8 @@ func (f *Fs) Purge(ctx context.Context) error {
 // between directories and a separate one to rename them.  We try to
 // call the minimum number of API calls.
 func (f *Fs) move(ctx context.Context, isFile bool, id, oldLeaf, newLeaf, oldDirectoryID, newDirectoryID string) (err error) {
-	newLeaf = enc.FromStandardName(newLeaf)
-	oldLeaf = enc.FromStandardName(oldLeaf)
+	newLeaf = f.opt.Enc.FromStandardName(newLeaf)
+	oldLeaf = f.opt.Enc.FromStandardName(oldLeaf)
 	doRenameLeaf := oldLeaf != newLeaf
 	doMove := oldDirectoryID != newDirectoryID
 
@@ -891,7 +897,7 @@ func (o *Object) Remote() string {
 
 // srvPath returns a path for use in server
 func (o *Object) srvPath() string {
-	return enc.FromStandardPath(o.fs.rootSlash() + o.remote)
+	return o.fs.opt.Enc.FromStandardPath(o.fs.rootSlash() + o.remote)
 }
 
 // Hash returns the SHA-1 of an object returning a lowercase hex string
@@ -1006,7 +1012,7 @@ func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, op
 	if err != nil {
 		return err
 	}
-	leaf = enc.FromStandardName(leaf)
+	leaf = o.fs.opt.Enc.FromStandardName(leaf)
 
 	var resp *http.Response
 	var info api.FolderUploadinfoResponse