test/infamy: support [.='value'] in restconf transport

The xpath_to_uri() method did not properly handle XPath expressions that
use [.='value'] syntax for selecting leaf-list items.  Example types of
XPath selection syntaxes:

    [key='value'] - for list items with named keys
    [.='value']   - for leaf-list items (current node selection)

Example XPath requiring this fix:

    /infix-firewall:firewall/zone[name='untrusted']/interface[.='e2']

Must be converted to a RESTCONF URL:

    /infix-firewall:firewall/zone=untrusted/interface=e2

Without this fix, the [.='value'] pattern was incorrectly converted and
caused "400 Bad Request" errors when attempting to delete any leaf-list
value with this syntax via RESTCONF.

Signed-off-by: Joachim Wiberg <[email protected]>

Author: troglobit

test/infamy/restconf.py

@@ -26,16 +26,19 @@ class Location:
 
 def xpath_to_uri(xpath, extra=None):
     """Convert xpath to HTTP URI"""
-    # If the xpath has a
+    # Handle [.='value'] syntax for leaf-list items
     pattern = r'\[(.*?)=["\'](.*?)["\']\]'
     matches = re.findall(pattern, xpath)
 
+    uri_path = xpath
     if matches:
         for key, value in matches:
-            # replace [key=value] with =value
-            uri_path = re.sub(rf'\[{re.escape(key)}=["\']{re.escape(value)}["\']\]', f'={value}', xpath)
-    else:
-        uri_path = xpath
+            if key == '.':
+                # For [.='value'], replace with =value
+                uri_path = re.sub(rf'\[\.=["\']{re.escape(value)}["\']\]', f'={value}', uri_path)
+            else:
+                # For [key='value'], replace with =value
+                uri_path = re.sub(rf'\[{re.escape(key)}=["\']{re.escape(value)}["\']\]', f'={value}', uri_path)
 
     # Append extra if provided
     if extra is not None: