Update request.py

Added support for the new self-generated API public/private keys. 3Commas now supports using RSA keys to create signed API requests. All you need to do is generate an RSA Key pair and register the public key on 3Commas: https://github.com/3commas-io/3commas-official-api-docs/blob/master/signed_endpoints_rsa.md#how-to-create-an-rsa-key-pair

py3cw/request.py

@@ -1,5 +1,10 @@
 import hashlib
-import hmac
+import hmac 
+from Crypto.Signature import pkcs1_15
+from Crypto.Hash import SHA256
+from Crypto.PublicKey import RSA
+from base64 import b64encode
+import base64
 import requests
 import json
 from .config import API_URL, API_VERSION_V1, API_VERSION_V2, API_VERSION_V2_ENTITIES, API_METHODS
@@ -17,21 +22,23 @@ def request(self, entity: str, action: str = '', action_id: str = None, payload:
 
 class Py3CW(IPy3CW):
 
-    def __init__(self, key: str, secret: str, request_options=None):
+    def __init__(self, key: str, secret: str = None, selfsigned: str = None, request_options = None):
         """
         Init the library with a 3commas key and secret strings. Get keys from your account API
         (https://3commas.io/api_access_tokens) page
         """
-
+        
         if request_options is None:
             request_options = {}
         if key is None or key == '':
             raise ValueError('Please enter a 3commas API key')
-        if secret is None or secret == '':
-            raise ValueError('Please enter a 3commas API secret')
+        if (secret is None or secret == '') and (selfsigned is None or selfsigned == ''):
+            raise ValueError('Please enter a 3Commas API secret or Private Key')
+
 
         self.key = key
         self.secret = secret
+        self.selfsigned = selfsigned
         self.request_timeout = request_options.get('request_timeout', 30)
         self.request_retries_count = request_options.get('nr_of_retries', 5)
         self.request_retry_status_codes = request_options.get('retry_status_codes', [500, 502, 503, 504])
@@ -53,9 +60,18 @@ def __generate_signature(self, path: str, data: str) -> str:
         """
         Generates the signature needed for 3commas API communication
         """
-        encoded_key = str.encode(self.secret)
-        message = str.encode(path + data)
-        signature = hmac.new(encoded_key, message, hashlib.sha256).hexdigest()
+        if self.selfsigned is None:
+            encoded_key = str.encode(self.secret)
+            message = str.encode(path + data)
+            signature = hmac.new(encoded_key, message, hashlib.sha256).hexdigest()
+
+        else:
+            encoded_key = RSA.import_key(self.selfsigned)
+            message = str.encode(path + data)
+            h = SHA256.new(message)
+            signer = pkcs1_15.new(encoded_key)
+            signature = b64encode(signer.sign(h)).decode('utf-8')
+
         return signature
 
     def __make_request(self, http_method: str, path: str, params: any, payload: any, additional_headers: dict,