webdav: fix depth:0 in rootless vfs;

also safeguards against potential issues with invalid
paths if the api is used incorrectly from a plugin

copyparty/httpcli.py

@@ -1551,6 +1551,7 @@ class HttpCli(object):
             if xtag is not None:
                 props = set([y.tag.split("}")[-1] for y in xtag])
             # assume <allprop/> otherwise; nobody ever gonna <propname/>
+            self.hint = ""
 
         zi = int(time.time())
         vst = os.stat_result((16877, -1, -1, 1, 1000, 1000, 8, zi, zi, zi))
@@ -1560,7 +1561,9 @@ class HttpCli(object):
         except OSError as ex:
             if ex.errno not in (errno.ENOENT, errno.ENOTDIR):
                 raise
-            raise Pebkac(404)
+            if tap:
+                raise Pebkac(404)
+            st = vst
 
         topdir = {"vp": "", "st": st}
         fgen: Iterable[dict[str, Any]] = []
@@ -1600,6 +1603,9 @@ class HttpCli(object):
             )
 
         elif depth == "0" or not stat.S_ISDIR(st.st_mode):
+            if depth == "0" and not self.vpath and not vn.realpath:
+                # rootless server; give dummy listing
+                self.can_read = True
             # propfind on a file; return as topdir
             if not self.can_read and not self.can_get:
                 self.log("inaccessible: %r" % ("/" + self.vpath,))
@@ -1632,7 +1638,11 @@ class HttpCli(object):
             self.log("inaccessible: %r" % ("/" + self.vpath,))
             raise Pebkac(401, "authenticate")
 
-        zi = vn.flags["du_iwho"] if "quota-available-bytes" in props else 0
+        zi = (
+            vn.flags["du_iwho"]
+            if vn.realpath and "quota-available-bytes" in props
+            else 0
+        )
         if zi and (
             zi == 9
             or (zi == 7 and self.uname != "*")
@@ -1767,6 +1777,7 @@ class HttpCli(object):
         assert xprop  # !rm
         for ze in xprop:
             ze.clear()
+        self.hint = ""
 
         txt = """<multistatus xmlns="DAV:"><response><propstat><status>HTTP/1.1 403 Forbidden</status></propstat></response></multistatus>"""
         xroot = parse_xml(txt)
@@ -1824,6 +1835,7 @@ class HttpCli(object):
         ET.register_namespace("D", "DAV:")
         lk = parse_xml(txt)
         assert lk.tag == "{DAV:}lockinfo"
+        self.hint = ""
 
         token = str(uuid.uuid4())