from OFS.SimpleItem import SimpleItem

import datetime
import hashlib


ZERO = datetime.timedelta(0)
class Utc(datetime.tzinfo):
    def utcoffset(self, dt):
        return ZERO

    def tzname(self, dt):
        return "UTC"

    def dst(self, dt):
        return ZERO
UTC = Utc()


class AuthTokenGenerator(SimpleItem):
    """Generator of auth tokens for OKFN Annotator""" 
    # Replace these with your details
    consumerKey = 'yourconsumerkey'
    consumerSecret = 'yourconsumersecret'
    
    # Only change this if you're sure you know what you're doing
    CONSUMER_TTL = 86400

    def generate_token(self, user_id):
        issue_time = datetime.datetime.now(UTC).isoformat()
        token = hashlib.sha256(self.consumerSecret + user_id + issue_time).hexdigest()
    
        return dict(
            consumerKey=self.consumerKey,
            authToken=token,
            authTokenIssueTime=issue_time,
            authTokenTTL=CONSUMER_TTL,
            userId=user_id
        )