Add utils.py

pysrc/utils.py

@@ -0,0 +1,14 @@
+import hashlib
+
+def unique_conversation_id(user_id: str, recipient_id: str) -> str:
+    md5 = hashlib.md5()
+    if user_id < recipient_id:
+        md5.update(user_id.encode())
+        md5.update(recipient_id.encode())
+    else:
+        md5.update(recipient_id.encode())
+        md5.update(user_id.encode())
+    digest = bytearray(md5.digest())
+    digest[6] = (digest[6] & 0x0f) | 0x30
+    digest[8] = (digest[8] & 0x3f) | 0x80
+    return f'{digest[0:4].hex()}-{digest[4:6].hex()}-{digest[6:8].hex()}-{digest[8:10].hex()}-{digest[10:].hex()}'