Use long-lived refresh token for the Dropbox backend

The refresh token can be downloaded from https://duplicacy.com/dropbox_start

Author: gilbertchen

src/duplicacy_dropboxstorage.go

@@ -21,11 +21,11 @@ type DropboxStorage struct {
 }
 
 // CreateDropboxStorage creates a dropbox storage object.
-func CreateDropboxStorage(accessToken string, storageDir string, minimumNesting int, threads int) (storage *DropboxStorage, err error) {
+func CreateDropboxStorage(refreshToken string, storageDir string, minimumNesting int, threads int) (storage *DropboxStorage, err error) {
 
 	var clients []*dropbox.Files
 	for i := 0; i < threads; i++ {
-		client := dropbox.NewFiles(dropbox.NewConfig(accessToken))
+		client := dropbox.NewFiles(dropbox.NewConfig("", refreshToken, "https://duplicacy.com/dropbox_refresh"))
 		clients = append(clients, client)
 	}
 

src/duplicacy_storage.go

@@ -540,7 +540,7 @@ func CreateStorage(preference Preference, resetPassword bool, threads int) (stor
 
 	} else if matched[1] == "dropbox" {
 		storageDir := matched[3] + matched[5]
-		token := GetPassword(preference, "dropbox_token", "Enter Dropbox access token:", true, resetPassword)
+		token := GetPassword(preference, "dropbox_token", "Enter Dropbox refresh token:", true, resetPassword)
 		dropboxStorage, err := CreateDropboxStorage(token, storageDir, 1, threads)
 		if err != nil {
 			LOG_ERROR("STORAGE_CREATE", "Failed to load the dropbox storage: %v", err)