Request signature in Python 3
This article presents a sample implementation of a request signature in Python 3.
# Dependencies
This example uses the hmac, hashlib, json and urllib.parse core dependencies from Python 3.
# Example
The following simple example implements the algorithm described in the Request signature guide. The most important thing is to use the hmac
module with the appropriate SHA256
algorithm and provide the parameters in the correct order: method
, url
, timestamp
, body
.
The method
parameter should be uppercase and path
should contain only the relative path and query parameters from the URL, not the full URL address. The full URL address should be converted to e.g. /webhook?a=1
.
If the algorithm works correctly, it should generate the same signature as the one given below: 56ac656c7f932c5b775be28949e90af9a2356eae2826539f10ab6526a0eec762
for the following parameters:
-
apiSecret=SECRET
-
method=POST
-
uri=http://demo.example.com/webhook?a=1
-
timestamp=1563276169752
-
body={a:1}
import hmac
import hashlib
import json
import urllib.parse
def hmacDigest(data, key):
keyEncoded = key.encode()
dataEncoded = data.encode()
h = hmac.new(keyEncoded, dataEncoded, hashlib.sha256)
return h.hexdigest()
def generateSignature(apiSecret, method, uri, timestamp, body):
url = urllib.parse.urlparse(uri)
path = url.path
if (url.query):
path = path + "?" + url.query
methodUpperCase = method.upper()
data = methodUpperCase + path + str(timestamp)
if (body):
data += json.dumps(body, separators=(',',':'))
return hmacDigest(data, apiSecret)
expectedSignature = "56ac656c7f932c5b775be28949e90af9a2356eae2826539f10ab6526a0eec762"
generatedSignature = generateSignature(
"SECRET",
"POST",
"http://demo.example.com/webhook?a=1",
1563276169752,
{"a": 1}
)
print(generatedSignature == expectedSignature)
# Usage
Run:
python3 index.py