From c3e2392f2bd8728091010c686d93653dc6a4ccfa Mon Sep 17 00:00:00 2001
From: Robert Thomas <31854736+wolveix@users.noreply.github.com>
Date: Fri, 5 Mar 2021 17:44:47 +0000
Subject: [PATCH] dropbox: fix polling support for scoped apps - fixes #5089
 (#5092)

This fixes the polling implementation for Dropbox, particularly
when using a scoped app. This also adds a lower end check for the
timeout, as I forgot to include that in the original implementation.
---
 backend/dropbox/dropbox.go | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/backend/dropbox/dropbox.go b/backend/dropbox/dropbox.go
index 31008ae76..406cb0677 100755
--- a/backend/dropbox/dropbox.go
+++ b/backend/dropbox/dropbox.go
@@ -1255,7 +1255,17 @@ func (f *Fs) changeNotifyCursor() (cursor string, err error) {
 	var startCursor *files.ListFolderGetLatestCursorResult
 
 	err = f.pacer.Call(func() (bool, error) {
-		startCursor, err = f.srv.ListFolderGetLatestCursor(&files.ListFolderArg{Path: f.opt.Enc.FromStandardPath(f.slashRoot), Recursive: true})
+		arg := files.ListFolderArg{
+			Path:      f.opt.Enc.FromStandardPath(f.slashRoot),
+			Recursive: true,
+		}
+
+		if arg.Path == "/" {
+			arg.Path = ""
+		}
+
+		startCursor, err = f.srv.ListFolderGetLatestCursor(&arg)
+
 		return shouldRetry(err)
 	})
 	if err != nil {
@@ -1270,6 +1280,11 @@ func (f *Fs) changeNotifyRunner(ctx context.Context, notifyFunc func(string, fs.
 
 	// Dropbox sets a timeout range of 30 - 480
 	timeout := uint64(f.ci.TimeoutOrInfinite() / time.Second)
+
+	if timeout < 30 {
+		timeout = 30
+	}
+
 	if timeout > 480 {
 		timeout = 480
 	}