private static List <Image> GetAccessibleImagesInFolder(ApplicationUser user, Folder folder,
ScreenTakerEntities context)
{
return(((
from image in folder.Images
where image.IsPublic
select image)
.Union(
from image in context.Images
join us in context.UserShares
on new { iid = (int?)image.Id, fid = image.FolderId } equals new { iid = us.ImageId, fid = folder.Id }
select image)
.Union(
from im in context.Images
where im.FolderId == folder.Id
join gs in context.GroupShares
on im.Id equals gs.ImageId
join pg in context.PersonGroups
on gs.GroupId equals pg.Id
join gm in context.GroupMembers
on pg.Id equals gm.GroupId
where gm.PersonId == user.Id
select im)
).ToList());
}
private static bool IsFolderSharedWithUser(ApplicationUser user, Person owner, Folder folder,
ScreenTakerEntities context)
{
return(folder.OwnerId == user.Id ||
context.UserShares.Any(us => us.PersonId == user.Id && us.FolderId == folder.Id) ||
(from gm in context.GroupMembers
join pg in context.PersonGroups
on new { pid = gm.PersonId, gid = gm.GroupId } equals new { pid = user.Id, gid = pg.Id }
join gs in context.GroupShares
on pg.Id equals gs.GroupId
where gs.FolderId == folder.Id
select gm.PersonId).Any());
}
public static bool IsFolderAccessible(ApplicationUser user, Person owner, Folder folder, ScreenTakerEntities context)
{
if (folder.IsPublic)
{
return(true);
}
if (user == null)
{
return(false);
}
return(IsFolderSharedWithUser(user, owner, folder, context));
}
public static bool IsImageAccessible(ApplicationUser user, Person owner, Image image, ScreenTakerEntities context)
{
if (image.IsPublic)
{
return(true);
}
if (user == null)
{
return(false);
}
return(image.Folder.OwnerId == user.Id ||
context.UserShares.Any(
us => us.PersonId == user.Id && (us.ImageId == image.Id || us.FolderId == image.FolderId)) ||
(from gm in context.GroupMembers
join pg in context.PersonGroups
on new { pid = gm.PersonId, gid = gm.GroupId } equals new { pid = user.Id, gid = pg.Id }
join gs in context.GroupShares
on pg.Id equals gs.GroupId
where gs.ImageId == image.Id || gs.FolderId == image.FolderId
select gm.PersonId).Any() ||
context.UserShares.Any(us => us.PersonId == user.Id && us.ImageId == image.Id));
}
public static List <Image> GetAccessibleImages(ApplicationUser user, Folder folder, ScreenTakerEntities context)
{
if (user == null)
{
// show only public images to unauthorized user
return(folder.IsPublic ? folder.Images.Where(i => i.IsPublic).ToList() : null);
}
// show all images to authorized user who has access
if (IsFolderSharedWithUser(user, folder.Person, folder, context))
{
return(folder.Images.ToList());
}
return(GetAccessibleImagesInFolder(user, folder, context));
}
public static bool IsFolderEditable(ApplicationUser user, Person owner, Folder folder, ScreenTakerEntities context)
{
return(folder.OwnerId == user?.Id);
}
public static bool IsImageEditable(ApplicationUser user, Person owner, Image image, ScreenTakerEntities context)
{
return(image.Folder.OwnerId == user?.Id);
}