pyCognito

Makes working with AWS Cognito easier for Python developers.

Getting Started

• Python Versions Supported
• Install
• Environment Variables
  • COGNITO_JWKS (optional)
• Cognito Utility Class pycognito.Cognito
  • Cognito Methods
    • Register
    • Authenticate
    • Admin Authenticate
    • Initiate Forgot Password
    • Confirm Forgot Password
    • Change Password
    • Confirm Sign Up
    • Update Profile
    • Send Verification
    • Get User Object
    • Get User
    • Get Users
    • Get Group Object
    • Get Group
    • Get Groups
    • Check Token
    • Verify Tokens
    • Logout
• Cognito SRP Utility
  • Using AWSSRP
• SRP Requests Authenticator

Python Versions Supported

• 3.6
• 3.7
• 3.8

Install

pip install pycognito

Environment Variables

COGNITO_JWKS

Optional: This environment variable is a dictionary that represent the well known JWKs assigned to your user pool by AWS Cognito. You can find the keys for your user pool by substituting in your AWS region and pool id for the following example. https://cognito-idp.{aws-region}.amazonaws.com/{user-pool-id}/.well-known/jwks.json

Example Value (Not Real):

COGNITO_JWKS={"keys": [{"alg": "RS256","e": "AQAB","kid": "123456789ABCDEFGHIJKLMNOP","kty": "RSA","n": "123456789ABCDEFGHIJKLMNOP","use": "sig"},{"alg": "RS256","e": "AQAB","kid": "123456789ABCDEFGHIJKLMNOP","kty": "RSA","n": "123456789ABCDEFGHIJKLMNOP","use": "sig"}]}

Cognito Utility Class

Example with All Arguments

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id',
    client_secret='optional-client-secret'
    username='optional-username',
    id_token='optional-id-token',
    refresh_token='optional-refresh-token',
    access_token='optional-access-token',
    access_key='optional-access-key',
    secret_key='optional-secret-key')

Arguments

• user_pool_id: Cognito User Pool ID
• client_id: Cognito User Pool Application client ID
• client_secret: App client secret (if app client is configured with client secret)
• username: User Pool username
• id_token: ID Token returned by authentication
• refresh_token: Refresh Token returned by authentication
• access_token: Access Token returned by authentication
• access_key: AWS IAM access key
• secret_key: AWS IAM secret key

Examples with Realistic Arguments

User Pool Id and Client ID Only

Used when you only need information about the user pool (ex. list users in the user pool)

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id')

Username

Used when the user has not logged in yet. Start with these arguments when you plan to authenticate with either SRP (authenticate) or admin_authenticate (admin_initiate_auth).

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id',
    username='bob')

Tokens

Used after the user has already authenticated and you need to build a new Cognito instance (ex. for use in a view).

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id',
    id_token='your-id-token',
    refresh_token='your-refresh-token',
    access_token='your-access-token')

u.verify_tokens() # See method doc below; may throw an exception

Cognito Attributes

After any authentication or other explicit verification of tokens, the following additional attributes will be available:

• id_claims — A dict of verified claims from the id token
• access_claims — A dict of verified claims from the access token

Cognito Methods

Register

Register a user to the user pool

Important: The arguments for set_base_attributes and add_custom_attributes methods depend on your user pool's configuration, and make sure the client id (app id) used has write permissions for the attributes you are trying to create. Example, if you want to create a user with a given_name equal to Johnson make sure the client_id you're using has permissions to edit or create given_name for a user in the pool.

from pycognito import Cognito

u = Cognito('your-user-pool-id', 'your-client-id')

u.set_base_attributes(email='you@you.com', some_random_attr='random value')

u.register('username', 'password')

Register with custom attributes.

Firstly, add custom attributes on 'General settings -> Attributes' page. Secondly, set permissions on 'Generals settings-> App clients-> Show details-> Set attribute read and write permissions' page.

from pycognito import Cognito

u = Cognito('your-user-pool-id', 'your-client-id')

u.set_base_attributes(email='you@you.com', some_random_attr='random value')

u.add_custom_attributes(state='virginia', city='Centreville')

u.register('username', 'password')

Arguments

• username: User Pool username
• password: User Pool password
• attr_map: Attribute map to Cognito's attributes

Authenticate

Authenticates a user

If this method call succeeds the instance will have the following attributes id_token, refresh_token, access_token, expires_in, expires_datetime, and token_type.

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id',
    username='bob')

u.authenticate(password='bobs-password')

Arguments

• password: - User's password

Admin Authenticate

Authenticate the user using admin super privileges

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id',
    username='bob')

u.admin_authenticate(password='bobs-password')

• password: User's password

Initiate Forgot Password

Sends a verification code to the user to use to change their password.

u = Cognito('your-user-pool-id','your-client-id',
    username='bob')

u.initiate_forgot_password()

Arguments

No arguments

Confirm Forgot Password

Allows a user to enter a code provided when they reset their password to update their password.

u = Cognito('your-user-pool-id','your-client-id',
    username='bob')

u.confirm_forgot_password('your-confirmation-code','your-new-password')

Arguments

• confirmation_code: The confirmation code sent by a user's request to retrieve a forgotten password
• password: New password

Change Password

Changes the user's password

from pycognito import Cognito

#If you don't use your tokens then you will need to
#use your username and password and call the authenticate method
u = Cognito('your-user-pool-id','your-client-id',
    id_token='id-token',refresh_token='refresh-token',
    access_token='access-token')

u.change_password('previous-password','proposed-password')

Arguments

• previous_password: - User's previous password
• proposed_password: - The password that the user wants to change to.

Confirm Sign Up

Use the confirmation code that is sent via email or text to confirm the user's account

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id')

u.confirm_sign_up('users-conf-code',username='bob')

Arguments

• confirmation_code: Confirmation code sent via text or email
• username: User's username

Update Profile

Update the user's profile

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id',
    id_token='id-token',refresh_token='refresh-token',
    access_token='access-token')

u.update_profile({'given_name':'Edward','family_name':'Smith',},attr_map=dict())

Arguments

• attrs: Dictionary of attribute name, values
• attr_map: Dictionary map from Cognito attributes to attribute names we would like to show to our users

Send Verification

Send verification email or text for either the email or phone attributes.

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id',
    id_token='id-token',refresh_token='refresh-token',
    access_token='access-token')

u.send_verification(attribute='email')

Arguments

• attribute: - The attribute (email or phone) that needs to be verified

Get User Object

Returns an instance of the specified user_class.

u = Cognito('your-user-pool-id','your-client-id',
    id_token='id-token',refresh_token='refresh-token',
    access_token='access-token')

u.get_user_obj(username='bjones',
    attribute_list=[{'Name': 'string','Value': 'string'},],
    metadata={},
    attr_map={"given_name":"first_name","family_name":"last_name"}
    )

Arguments

• username: Username of the user
• attribute_list: List of tuples that represent the user's attributes as returned by the admin_get_user or get_user boto3 methods
• metadata: (optional) Metadata about the user
• attr_map: (optional) Dictionary that maps the Cognito attribute names to what we'd like to display to the users

Get User

Get all of the user's attributes. Gets the user's attributes using Boto3 and uses that info to create an instance of the user_class

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id',
    username='bob')

user = u.get_user(attr_map={"given_name":"first_name","family_name":"last_name"})

Arguments

• attr_map: Dictionary map from Cognito attributes to attribute names we would like to show to our users

Get Users

Get a list of the user in the user pool.

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id')

user = u.get_users(attr_map={"given_name":"first_name","family_name":"last_name"})

Arguments

• attr_map: Dictionary map from Cognito attributes to attribute names we would like to show to our users

Get Group object

Returns an instance of the specified group_class.

u = Cognito('your-user-pool-id', 'your-client-id')

group_data = {'GroupName': 'user_group', 'Description': 'description',
            'Precedence': 1}

group_obj = u.get_group_obj(group_data)

Arguments

• group_data: Dictionary with group's attributes.

Get Group

Get all of the group's attributes. Returns an instance of the group_class. Requires developer credentials.

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id')

group = u.get_group(group_name='some_group_name')

Arguments

• group_name: Name of a group

Get Groups

Get a list of groups in the user pool. Requires developer credentials.

from pycognito import Cognito

u = Cognito('your-user-pool-id','your-client-id')

groups = u.get_groups()

Check Token

Checks the exp attribute of the access_token and either refreshes the tokens by calling the renew_access_tokens method or does nothing. IMPORTANT: Access token is required

u = Cognito('your-user-pool-id','your-client-id',
    id_token='id-token',refresh_token='refresh-token',
    access_token='access-token')

u.check_token()

Arguments

No arguments for check_token

Verify Tokens

Verifies the current id_token and access_token. An exception will be thrown if they do not pass verification. It can be useful to call this method immediately after instantiation when you're providing externally-remembered tokens to the Cognito() constructor. Note that if you're calling check_tokens() after instantitation, you'll still want to call verify_tokens() afterwards it in case it did nothing. This method also ensures that the id_claims and access_claims attributes are set with the verified claims from each token.

u = Cognito('your-user-pool-id','your-client-id',
    id_token='id-token',refresh_token='refresh-token',
    access_token='access-token')

u.check_tokens()  # Optional, if you want to maybe renew the tokens
u.verify_tokens()

Arguments

No arguments for verify_tokens

Logout

Logs the user out of all clients and removes the expires_in, expires_datetime, id_token, refresh_token, access_token, and token_type attributes.

from pycognito import Cognito

#If you don't use your tokens then you will need to
#use your username and password and call the authenticate method
u = Cognito('your-user-pool-id','your-client-id',
    id_token='id-token',refresh_token='refresh-token',
    access_token='access-token')

u.logout()

Arguments

No arguments for logout

Cognito SRP Utility

The AWSSRP class is used to perform SRP(Secure Remote Password protocol) authentication. This is the preferred method of user authentication with AWS Cognito. The process involves a series of authentication challenges and responses, which if successful, results in a final response that contains ID, access and refresh tokens.

Using AWSSRP

The AWSSRP class takes a username, password, cognito user pool id, cognito app id, an optional client secret (if app client is configured with client secret), an optional pool_region or boto3 client. Afterwards, the authenticate_user class method is used for SRP authentication.

import boto3
from pycognito.aws_srp import AWSSRP

client = boto3.client('cognito-idp')
aws = AWSSRP(username='username', password='password', pool_id='user_pool_id',
             client_id='client_id', client=client)
tokens = aws.authenticate_user()

SRP Requests Authenticator

pycognito.utils.RequestsSrpAuth is a Requests authentication plugin to automatically populate an HTTP header with a Cognito token. By default, it'll populate the Authorization header using the Cognito Access Token as a bearer token.

RequestsSrpAuth handles fetching new tokens using the refresh tokens.

Usage

import requests
from pycognito.utils import RequestsSrpAuth

auth = RequestsSrpAuth(
  username='myusername',
  password='secret',
  user_pool_id='eu-west-1_1234567',
  client_id='4dn6jbcbhqcofxyczo3ms9z4cc',
  user_pool_region='eu-west-1',
)

response = requests.get('http://test.com', auth=auth)