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jwt_token.py
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jwt_token.py
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import os
import base64
import time
import uuid
import hashlib
import jwt
from Crypto.PublicKey import RSA
class JWTToken():
"Generate Token"
algorithm = 'RS256'
def __init__(self, account, service, scope):
self.account = account
self.service = service
self.scope = scope
self.private_key = open(os.environ['PRIVATE_KEY_PATH']).read()
def claim(self):
return {
"iss": os.environ['TOKEN_ISSUER'],
"sub": self.account,
"aud": self.service,
"exp": int(time.time()) + (5 * 60),
"nbf": int(time.time()),
"iat": int(time.time()),
"jti": str(uuid.uuid4()),
"access": self.scope and [
{
"type": "repository",
"name": self.scope.image,
"actions": self.scope.actions
}
]
}
def generate(self):
"Generate JWT token"
return jwt.encode(
self.claim(), self.private_key, algorithm=self.algorithm,
headers=self.headers()
)
def headers(self):
"JWT header"
return {
'typ': 'JWT',
'alg': self.algorithm,
'kid': self.jwt_kid()
}
def jwt_kid(self):
"Generates ID for signing key"
key = RSA.importKey(self.private_key)
der = key.publickey().exportKey("DER")
payload = hashlib.sha256(der).digest()[:30]
kid = base64.b32encode(payload)
return ":".join([kid[i:i+4] for i in range(0, len(kid), 4)])