fix(dropbox): incorrect path error during upload (#1052)

* Fix incorrect path error during upload on Dropbox

* Add RootNamespaceId to the config for direct modification

* Refactor Dropbox header logic: extract JSON marshaling into helper method

* Fix Dropbox: replace marshalToJSONString with utils.Json.MarshalToString

Author: tuthanika

drivers/dropbox/meta.go

@@ -13,7 +13,7 @@ type Addition struct {
 	ClientSecret    string `json:"client_secret" required:"false" help:"Keep it empty if you don't have one"`
 	AccessToken     string
 	RefreshToken    string `json:"refresh_token" required:"true"`
-	RootNamespaceId string
+	RootNamespaceId string `json:"RootNamespaceId" required:"false"`
 }
 
 var config = driver.Config{

drivers/dropbox/util.go

@@ -175,6 +175,13 @@ func (d *Dropbox) finishUploadSession(ctx context.Context, toPath string, offset
 	}
 	req.Header.Set("Content-Type", "application/octet-stream")
 	req.Header.Set("Authorization", "Bearer "+d.AccessToken)
+	if d.RootNamespaceId != "" {
+	apiPathRootJson, err := d.buildPathRootHeader()
+	if err != nil {
+	    return err
+	}
+	req.Header.Set("Dropbox-API-Path-Root", apiPathRootJson)
+}
 
 	uploadFinishArgs := UploadFinishArgs{
 		Commit: struct {
@@ -219,6 +226,13 @@ func (d *Dropbox) startUploadSession(ctx context.Context) (string, error) {
 	}
 	req.Header.Set("Content-Type", "application/octet-stream")
 	req.Header.Set("Authorization", "Bearer "+d.AccessToken)
+	if d.RootNamespaceId != "" {
+	apiPathRootJson, err := d.buildPathRootHeader()
+	if err != nil {
+	    return "", err
+	}
+	req.Header.Set("Dropbox-API-Path-Root", apiPathRootJson)
+}
 	req.Header.Set("Dropbox-API-Arg", "{\"close\":false}")
 
 	res, err := base.HttpClient.Do(req)
@@ -233,3 +247,11 @@ func (d *Dropbox) startUploadSession(ctx context.Context) (string, error) {
 	_ = res.Body.Close()
 	return sessionId, nil
 }
+
+func (d *Dropbox) buildPathRootHeader() (string, error) {
+    return utils.Json.MarshalToString(map[string]interface{}{
+        ".tag": "root",
+        "root": d.RootNamespaceId,
+    })
+}
+