add python script which generates an ini config snippet to pin edges

contrib/snode-pin.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+#
+# a script to generate a lokinet ini file that pins your edges to use only snodes run under the wallet addresses of a whitelist of opers.
+#
+# usage: ./snode-pin.py walletaddr1 walletaddr2 ... walletaddrN > 00-edges.ini
+#
+# then copy 00-edges.ini into /var/lib/lokinet/conf.d/
+# create that dir if it does not exist.
+#
+
+import oxenc
+import binascii
+import sys
+import requests
+
+from collections import defaultdict
+
+addrs = sys.argv[1:]
+snodes = defaultdict(set)
+jreq = {
+    "jsonrpc": "2.0",
+    "id": "0",
+    "method": "get_service_nodes",
+    "params": {"service_node_pubkeys": []},
+}
+
+# collect all snodes
+resp = requests.post("https://public.loki.foundation/json_rpc", json=jreq)
+for snode in resp.json().get("result").get("service_node_states", []):
+    addr = snode.get("operator_address", None)
+    if addr in addrs:
+        snodes[addr].add(snode.get("pubkey_ed25519"))
+
+# print the config snippet to stdout
+for oper, addrs in snodes.items():
+    print(f"# pin edges to use oper {oper}") 
+    print("[network]") 
+    print("\n".join(f"strict-connect={oxenc.to_base32z(binascii.unhexlify(addr.strip()))}.snode" for addr in addrs ))