How to restrict edit/delete of a file in Document Library based on user and logic?

Question

I have a document library where many users can upload a document and start workflows on that individual document.

There is option to restrict edit/delete of lists items based on the current user credentials but isn't there any way to do the same for the Document Library documents?

I want to be able to restrict EDIT/DELETE of a document based on my custom logic. The logic is somewhat like this: Document can only be edited by the user who uploaded the document only when the 'status' column of the library is set to "allowed for Editing"

So where do I implement this kind of logic?

Answer 1

One option to avoid delete will be on Itemdeleting event you can check whether user is Author of the document and then cancel/execute event depending on condition.

    public override void ItemDeleting(SPItemEventProperties properties)
            {
                base.ItemDeleting(properties);

                using (SPWeb web = properties.OpenWeb())
                {                
                    SPUser creator = new SPFieldUserValue(web, properties.ListItem["Author"].ToString()).User;
                    SPUser currentuser = web.SiteUsers.GetByID(properties.CurrentUserId);

                    bool isCurrentUserCreator = creator.ID.Equals(currentuser.ID);

                    if (!isCurrentUserCreator)
                    {
                        string errormsg = "You can delete own documents only";

                        properties.ErrorMessage = errormsg;
                        properties.Status = SPEventReceiverStatus.CancelWithError;   
                    }
                }
}

I had similar question sometime back and I used above code to restrict user from deleting documents of other user.

How to restrict user from deleting\editing documents if user is not author of that document