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POAuthenticated call to MtGox WebSocket API in Python 3
 

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  1. POAuthenticated call to MtGox WebSocket API in Python 3
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    <p>I'm trying to authenticate with the MtGox.com WebSocket API and after a long while managed to complete the required "call" attribute of the JSON data. However, I realized that I was using Python 2 to run my codesample and the application the API is finally going to be implemented in is written in Python 3. When I tried to make it work in Python 3 I ran into a couple of problems I was unable to resolve despite several long attempts.</p> <p>I also tried <code>2to3</code>, but seems it doesn't have builtin fixers for these kinds of problems.</p> <p>The API specification for authenticated API calls can be found here: <a href="https://en.bitcoin.it/wiki/MtGox/API/Streaming#Authenticated_commands" rel="nofollow">https://en.bitcoin.it/wiki/MtGox/API/Streaming#Authenticated_commands</a></p> <p>Here is the working Python 2 script I used for generating the JSON call which I then ran through a WebSocket console extension I found for Chrome.</p> <pre><code>import hashlib import time import hmac import json import base64 import binascii apikey = "" apisecret = "" def _nonce(): """produce a unique nonce that is guaranteed to be ever increasing""" microtime = int(time.time() * 1E6) return microtime def _reqid(nonce): return hashlib.md5(str(nonce)).hexdigest() def send_signed_call(api_endpoint, params): nonce = _nonce() reqid = _reqid(nonce) call = json.dumps({ "id" : reqid, "nonce" : nonce, "call" : api_endpoint, "params" : params, }) sign = hmac.new(base64.b64decode(apisecret), call, hashlib.sha512).digest() signedcall = apikey.replace("-", "").decode("hex") + sign + call return json.dumps({ "op" : "call", "call" : base64.b64encode(signedcall), "id" : reqid, "context" : "mtgox.com" }) msg = send_signed_call("private/info", {}) print(msg) </code></pre> <p>Some of the errors I ran into related to the no longer existing String.decode("hex"), I've had a few others but unfortunately I haven't kept track of all of them as I tried a great deal of different approaches. I also looked at codesamples of the same functionality in other languages but couldn't find any clue relating to the Python 3 problem. A lot seems to be having to do with changes made to bytes and strings encoding and decoding in Python 3.</p> <p>Thanks a lot in advance!</p>
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