public async Task <ActionResult> Files(string groupId, int?pageSize, string nextLink)
{
if (!string.IsNullOrEmpty((string)TempData["error"]))
{
ViewBag.ErrorMessage = (string)TempData["error"];
}
pageSize = pageSize ?? 25;
var client = GetGraphServiceClient();
var request = client.Groups[groupId].Drive.Root.Children.Request().Top(pageSize.Value);
if (!string.IsNullOrEmpty(nextLink))
{
request = new DriveItemChildrenCollectionRequest(nextLink, client, null);
}
try
{
var results = await request.GetAsync();
ViewBag.NextLink = null == results.NextPageRequest ? null :
results.NextPageRequest.GetHttpRequestMessage().RequestUri;
return(View(results));
}
catch (ServiceException ex)
{
if (ex.Error.Code == "InvalidAuthenticationToken")
{
return(new EmptyResult());
}
return(RedirectToAction("Index", "Error", new { message = ex.Error.Message }));
}
}
// Builds a FilesViewDisplayModel
// folderId: ID of the folder to get files and folders from. If null, gets from the root
// pageRequestUrl: Used for paging requests to get the next set of results
private async Task <IActionResult> GetViewForFolder(string folderId = null,
string pageRequestUrl = null)
{
var model = new FilesViewDisplayModel();
try
{
var graphClient = GetGraphClientForScopes(_filesScopes);
// Get selected folder
IDriveItemRequest folderRequest;
if (string.IsNullOrEmpty(folderId))
{
// Get the root
// GET /me/drive/root
folderRequest = graphClient.Me
.Drive
.Root
.Request();
}
else
{
// GET /me/drive/items/folderId
folderRequest = graphClient.Me
.Drive
.Items[folderId]
.Request();
}
// Send the request
model.SelectedFolder = await folderRequest
// Only select the fields used by the app
.Select(d => new
{
d.Id,
d.Name,
d.ParentReference
})
.GetAsync();
// Get files and folders
IDriveItemChildrenCollectionRequest itemRequest;
// Is this a page request?
if (!string.IsNullOrEmpty(pageRequestUrl))
{
// Instead of using the request builders,
// initialize the request directly from the supplied
// URL
itemRequest = new DriveItemChildrenCollectionRequest(
pageRequestUrl, graphClient, null);
}
else if (string.IsNullOrEmpty(folderId))
{
// No folder ID specified, so use /me/drive/root/children
// to get all items in the root of user's drive
// GET /me/drive/root/children
itemRequest = graphClient.Me
.Drive
.Root
.Children
.Request();
}
else
{
// Folder ID specified
// GET /me/drive/items/folderId/children
itemRequest = graphClient.Me
.Drive
.Items[folderId]
.Children
.Request();
}
if (string.IsNullOrEmpty(pageRequestUrl))
{
itemRequest = itemRequest
.Top(GraphConstants.PageSize)
// Only get the fields used by the view
.Select(d => new
{
d.File,
d.FileSystemInfo,
d.Folder,
d.Id,
d.LastModifiedBy,
d.Name,
d.ParentReference
})
.Expand("thumbnails");
}
// Get max PageSize number of results
var driveItemPage = await itemRequest
.GetAsync();
model.Files = new List <DriveItem>();
model.Folders = new List <DriveItem>();
foreach (var item in driveItemPage.CurrentPage)
{
if (item.Folder != null)
{
model.Folders.Add(item);
}
else if (item.File != null)
{
model.Files.Add(item);
}
}
model.NextPageUrl = driveItemPage.NextPageRequest?
.GetHttpRequestMessage().RequestUri.ToString();
return(View("Index", model));
}
catch (ServiceException ex)
{
InvokeAuthIfNeeded(ex);
return(RedirectToAction("Error", "Home")
.WithError($"Error getting files", ex.Error.Message));
}
}
