servicesExtensions implementation. It's almost identical to servicesC…

…ontracts.

servicesExtensions.py

@@ -1,22 +1,33 @@
 from typing import Any, Union
 
 from artifacts import *
-
 from servicesExtensions.requestSyncrhoneExtensionEscrow_service import RequestSynchroneExtensionEscrowService
 
 def getServiceFromAddress(address: str) -> Union[RequestSynchroneExtensionEscrowService, None]:
     """
     Returns the service of a corresponding extension contract address
-    :param address: The address of the extension contract
-    :return: The service object or None if not found
+    :param  address:
+        The address of the currency contract
+    :return
+        The service object or None if not found
     """
-    pass
+    if not address:
+        return None
+    if isThisArtifact(requestSynchroneExtensionEscrowArtifact, address):
+        return RequestSynchroneExtensionEscrowService()
 
 def isThisArtifact(artifact: Any, address: str) -> bool:
     """
-    TODO: Fill out a description of what this does, no notes in RequestNetwork.js repo
-    :param artifact:
-    :param address:
-    :return:
+    return True if any address in the network is sanitized address, otherwise it returns False
+    :param  artifact:
+        RequestNetwork Artifact to use in its interactions with the Ethereum network
+    :param  address:
+        The address of the currency contract
     """
-    pass
+    if not address:
+        return False
+    sanitizedAdress = address.lower()
+    for network in artifact["networks"].values():
+        if 'address' in network and network['address'].lower() == sanitizedAdress:
+            return True
+    return False