Shared folder fix (#90)

* fix methods for shared drive items

* update news

* add explanatory comment

* keep all properties consistent

NEWS.md

@@ -1,5 +1,6 @@
 # Microsoft365R 2.3.1.9000
 
+- Fix broken methods for accessing items in shared OneDrive/SharePoint folders (#89).
 - Fix a bug in sending file attachments in Teams chats (#87).
 
 # Microsoft365R 2.3.1

R/ms_drive.R

@@ -207,7 +207,7 @@ public=list(
         }
 
         df$remoteItem <- lapply(seq_len(nrow(df)),
-            function(i) ms_drive_item$new(self$token, self$tenant, df$remoteItem[i, ]))
+            function(i) ms_drive_item$new(self$token, self$tenant, df$remoteItem[i, ], remote=TRUE))
 
         switch(info,
             partial=df[c("name", "size", "isdir", "remoteItem")],

R/ms_drive_item.R

@@ -108,9 +108,10 @@ ms_drive_item <- R6::R6Class("ms_drive_item", inherit=ms_object,
 
 public=list(
 
-    initialize=function(token, tenant=NULL, properties=NULL)
+    initialize=function(token, tenant=NULL, properties=NULL, remote=FALSE)
     {
         self$type <- "drive item"
+        private$remote <- remote
         private$api_type <- file.path("drives", properties$parentReference$driveId, "items")
         super$initialize(token, tenant, properties)
     },
@@ -320,6 +321,9 @@ public=list(
 
 private=list(
 
+    # flag: whether this object is a shared file/folder on another drive
+    remote=NULL,
+
     # dest = . or '' --> this item
     # dest = .. --> parent folder
     # dest = (childname) --> path to named child
@@ -327,14 +331,18 @@ private=list(
     {
         if(dest == ".")
             dest <- ""
+
+        # this is needed to find the correct parent folder for a shared item
+        if(private$remote)
+            private$normalise_remote_item()
+
         parent <- self$properties$parentReference
         name <- self$properties$name
         op <- if(name == "root")
             file.path("drives", parent$driveId, "root:")
         else
         {
-            # have to infer the parent path if we got this item as a Teams channel folder
-            # in this case, assume the parent is the root folder
+            # null path means parent is the root folder
             if(is.null(parent$path))
                 parent$path <- sprintf("/drives/%s/root:", parent$driveId)
             if(dest != "..")
@@ -356,6 +364,17 @@ private=list(
     {
         if(self$is_folder())
             stop("This method is only applicable for a file item", call.=FALSE)
+    },
+
+    normalise_remote_item=function()
+    {
+        # if this was a shared item, replace properties with those obtained from original drive
+        if(!private$remote)
+            return(NULL)
+        parent <- self$properties$parentReference
+        op <- file.path("drives", parent$driveId, "items", self$properties$id)
+        self$properties <- call_graph_endpoint(self$token, op)
+        private$remote <- FALSE
     }
 ))