A secure authentication module to manage user access in a Streamlit application

Table of Contents

• Quickstart
• Installation
• Creating a configuration file
• Setup
• Creating a login widget
• Creating a guest login widget 🚀 NEW
• Authenticating users
• Creating a reset password widget
• Creating a new user registration widget
• Creating a forgot password widget
• Creating a forgot username widget
• Creating an update user details widget
• Updating the configuration file
• License

1. Quickstart

• Check out the demo app.
• Feel free to visit the API reference.
• And finally follow the tutorial below.

2. Installation

Streamlit-Authenticator is distributed via PyPI:

pip install streamlit-authenticator

Using Streamlit-Authenticator is as simple as importing the module and calling it to verify your user's credentials.

import streamlit as st
import streamlit_authenticator as stauth

3. Creating a configuration file

• Initially create a YAML configuration file and add to it your users' credentials: including names, usernames, and passwords (plain text passwords will be hashed automatically).
• In addition, enter a name, random key, and number of days to expiry, for a re-authentication cookie that will be stored on the client's browser to enable password-less re-authentication. If you do not require re-authentication, you may set the number of days to expiry to 0.
• Finally, define a list of pre-authorized emails of users who can register and add their credentials to the configuration file with the use of the register_user widget.
• Please remember to update the config file (as shown in step 13) after you use the reset_password, register_user, forgot_password, or update_user_details widgets.

cookie:
  expiry_days: 30
  key: some_signature_key # Must be a string
  name: some_cookie_name
credentials:
  usernames:
    jsmith:
      email: jsmith@gmail.com
      failed_login_attempts: 0 # Will be managed automatically
      first_name: John
      last_name: Smith
      logged_in: False # Will be managed automatically
      password: abc # Will be hashed automatically
      roles: # Optional
      - admin
      - editor
      - viewer
    rbriggs:
      email: rbriggs@gmail.com
      failed_login_attempts: 0 # Will be managed automatically
      first_name: Rebecca
      last_name: Briggs
      logged_in: False # Will be managed automatically
      password: def # Will be hashed automatically
      roles: # Optional
      - viewer
oauth2: # Optional
  google: # Follow instructions: https://developers.google.com/identity/protocols/oauth2
    client_id: # To be filled
    client_secret: # To be filled
    redirect_uri: # URL to redirect to after OAuth2 authentication
  microsoft: # Follow instructions: https://learn.microsoft.com/en-us/graph/auth-register-app-v2
    client_id: # To be filled
    client_secret: # To be filled
    redirect_uri: # URL to redirect to after OAuth2 authentication
    tenant_id: # To be filled
pre-authorized: # Optional
  emails:
  - melsby@gmail.com

• Please note that the 'failed_login_attempts' and 'logged_in' fields corresponding to each user's number of failed login attempts and log-in status in the credentials will be added and managed automatically.

4. Setup

• Subsequently import the configuration file into your script and create an authentication object.

import yaml
from yaml.loader import SafeLoader

with open('../config.yaml') as file:
    config = yaml.load(file, Loader=SafeLoader)

# Pre-hashing all plain text passwords once
# stauth.Hasher.hash_passwords(config['credentials'])

authenticator = stauth.Authenticate(
    config['credentials'],
    config['cookie']['name'],
    config['cookie']['key'],
    config['cookie']['expiry_days']
)

• Plain text passwords will be hashed automatically by default, however, for a large number of users it is recommended to pre-hash the passwords in the credentials using the Hasher.hash_passwords function.
• If you choose to pre-hash the passwords, please set the auto_hash parameter in the Authenticate class to False.

Hasher.hash_passwords

Parameters:

• credentials: dict
  • The credentials dict with plain text passwords.

Returns:

• dict
  • The credentials dict with hashed passwords.

Authenticate

Parameters:

• credentials: dict, str
  • Dictionary with the usernames, names, passwords, and emails, and other user data, or path pointing to the location of the config file.
• cookie_name: str
  • Specifies the name of the re-authentication cookie stored on the client's browser for password-less re-authentication.
• cookie_key: str
  • Specifies the key that will be used to hash the signature of the re-authentication cookie.
• cookie_expiry_days: float, default 30.0
  • Specifies the number of days before the re-authentication cookie automatically expires on the client's browser.
• validator: Validator, optional, default None
  • Provides a validator object that will check the validity of the username, name, and email fields.
• auto_hash: bool, default True
  • Automatic hashing requirement for passwords, True: plain text passwords will be hashed automatically, False: plain text passwords will not be hashed automatically.
• **kwargs: dict, optional
  • Arguments to pass to the Authenticate class.

• Please remember to pass the authenticator object to each and every page in a multi-page application as a session state variable.

5. Creating a login widget

• You can render the login widget as follows.

try:
    authenticator.login()
except LoginError as e:
    st.error(e)

Authenticate.login

Parameters:

• location: str, {'main', 'sidebar', 'unrendered'}, default 'main'
  • Specifies the location of the login widget.
• max_concurrent_users: int, optional, default None
  • Limits the number of concurrent users. If not specified there will be no limit to the number of concurrently logged in users.
• max_login_attempts: int, optional, default None
  • Limits the number of failed login attempts. If not specified there will be no limit to the number of failed login attempts.
• fields: dict, optional, default {'Form name':'Login', 'Username':'Username', 'Password':'Password', 'Login':'Login', 'Captcha':'Captcha'}
  • Customizes the text of headers, buttons and other fields.
• captcha: bool, default False
  • Specifies the captcha requirement for the login widget, True: captcha required, False: captcha removed.
• single_session: bool, default False
  • Disables the ability for the same user to log in multiple sessions, True: single session allowed, False: multiple sessions allowed.
• clear_on_submit: bool, default False
  • Specifies the clear on submit setting, True: clears inputs on submit, False: keeps inputs on submit.
• key: str, default 'Login'
  • Unique key provided to widget to avoid duplicate WidgetID errors.
• callback: callable, optional, default None
  • Callback function that will be invoked on form submission with a dict as a parameter.

• Please remember to re-invoke an 'unrendered' login widget on each and every page in a multi-page application.

6. Creating a guest login button

• You may use the experimental_guest_login button to log in non-registered users with their Google or Microsoft accounts using OAuth2.
• To create the client ID and client secret parameters for Google OAuth2 please refer to Google's documentation.
• To create the client ID, client secret, and tenant ID parameters for Microsoft OAuth2 please refer to Microsoft's documentation.
• Once you have created the OAuth2 configuration parameters, add them to the configuration file as shown in step 3.

try:
    authenticator.experimental_guest_login('Login with Google',
                                           provider='google',
                                           oauth2=config['oauth2'])
    authenticator.experimental_guest_login('Login with Microsoft',
                                           provider='microsoft',
                                           oauth2=config['oauth2'])
except LoginError as e:
    st.error(e)

Authenticate.experimental_guest_login

Parameters:

• button_name: str, default 'Guest login'
  • Rendered name of the guest login button.
• location: str, {'main', 'sidebar'}, default 'main'
  • Specifies the location of the guest login button.
• provider: str, {'google', 'microsoft'}, default 'google'
  • Selection for OAuth2 provider, Google or Microsoft.
• oauth2: dict, optional, default None
  • Configuration parameters to implement an OAuth2 authentication.
• max_concurrent_users: int, optional, default None
  • Limits the number of concurrent users. If not specified there will be no limit to the number of concurrently logged in users.
• single_session: bool, default False
  • Disables the ability for the same user to log in multiple sessions, True: single session allowed, False: multiple sessions allowed.
• roles: list, optional, default None
  • User roles for guest users.
• callback: callable, optional, default None
  • Callback function that will be invoked on button press with a dict as a parameter.

• Please note that upon successful login, the guest user's name, email, and other information will be registered in the credentials dictionary and their re-authentication cookie will be saved automatically.
• In addition, you may access the user's roles through st.session_state['roles'].

7. Authenticating users

• You can then retrieve the name, authentication status, and username from Streamlit's session state using st.session_state['name'], st.session_state['authentication_status'], and st.session_state['username'] to allow a verified user to access restricted content.
• You may also render a logout button, or may choose not to render the button if you only need to implement the logout logic programmatically.
• The optional key parameter for the logout button should be used with multi-page applications to prevent Streamlit from throwing duplicate key errors.

if st.session_state['authentication_status']:
    authenticator.logout()
    st.write(f'Welcome *{st.session_state["name"]}*')
    st.title('Some content')
elif st.session_state['authentication_status'] is False:
    st.error('Username/password is incorrect')
elif st.session_state['authentication_status'] is None:
    st.warning('Please enter your username and password')

Authenticate.logout

Parameters:

• button_name: str, default 'Logout'
  • Customizes the button name.
• location: str, {'main', 'sidebar', 'unrendered'}, default 'main'
  • Specifies the location of the logout button. If 'unrendered' is passed, the logout logic will be executed without rendering the button.
• key: str, default None
  • Unique key that should be used in multi-page applications.
• callback: callable, optional, default None
  • Callback function that will be invoked on form submission with a dict as a parameter.

• Or prompt an unverified user to enter a correct username and password.

• You may also retrieve the number of failed login attempts a user has made by accessing st.session_state['failed_login_attempts'] which returns a dictionary with the username as key and the number of failed attempts as the value.

8. Creating a reset password widget

• You may use the reset_password widget to allow a logged in user to modify their password as shown below.

if st.session_state['authentication_status']:
    try:
        if authenticator.reset_password(st.session_state['username']):
            st.success('Password modified successfully')
    except Exception as e:
        st.error(e)

Authenticate.reset_password

Parameters:

• username: str
  • Specifies the username of the user to reset the password for.
• location: str, {'main', 'sidebar'}, default 'main'
  • Specifies the location of the reset password widget.
• fields: dict, optional, default {'Form name':'Reset password', 'Current password':'Current password', 'New password':'New password', 'Repeat password': 'Repeat password', 'Reset':'Reset'}
  • Customizes the text of headers, buttons and other fields.
• clear_on_submit: bool, default False
  • Specifies the clear on submit setting, True: clears inputs on submit, False: keeps inputs on submit.
• key: str, default 'Reset password'
  • Unique key provided to widget to avoid duplicate WidgetID errors.
• callback: callable, optional, default None
  • Callback function that will be invoked on form submission with a dict as a parameter.

Returns::

• bool
  • Status of resetting the password.

• Please remember to update the config file (as shown in step 13) after you use this widget.

9. Creating a new user registration widget

• You may use the register_user widget to allow a user to sign up to your application as shown below.
• If you require the user to be pre-authorized, define a pre_authorized list of emails that are allowed to register, and add it to the configuration file or provide it as a parameter to the register_user widget.
• Once they have registered, their email will be automatically removed from the pre_authorized list.
• Alternatively, to allow anyone to sign up, do not provide a pre_authorized list.

try:
    email_of_registered_user, \
    username_of_registered_user, \
    name_of_registered_user = authenticator.register_user(pre_authorized=config['pre-authorized'])
    if email_of_registered_user:
        st.success('User registered successfully')
except Exception as e:
    st.error(e)

Authenticate.register_user

Parameters:

• location: str, {'main', 'sidebar'}, default 'main'
  • Specifies the location of the register user widget.
• pre_authorized: list, optional, default None
  • List of emails of unregistered users who are authorized to register. If no list is provided, all users will be allowed to register.
• domains: list, optional, default None
  • Specifies the required list of domains a new email must belong to i.e. ['gmail.com', 'yahoo.com'], list: the required list of domains, None: any domain is allowed.
• fields: dict, optional, default {'Form name':'Register user', 'Email':'Email', 'Username':'Username', 'Password':'Password', 'Repeat password':'Repeat password', 'Password hint':'Password hint', 'Captcha':'Captcha', 'Register':'Register'}
  • Customizes the text of headers, buttons and other fields.
• captcha: bool, default True
  • Specifies the captcha requirement for the register user widget, True: captcha required, False: captcha removed.
• roles: list, optional, default None
  • User roles for registered users.
• merge_username_email: bool, default False
  • Merges username into email field, True: username will be the same as the email, False: username and email will be independent.
• clear_on_submit: bool, default False
  • Specifies the clear on submit setting, True: clears inputs on submit, False: keeps inputs on submit.
• key: str, default 'Register user'
  • Unique key provided to widget to avoid duplicate WidgetID errors.
• callback: callable, optional, default None
  • Callback function that will be invoked on form submission with a dict as a parameter.

Returns:

• str
  • Email associated with the new user.
• str
  • Username associated with the new user.
• str
  • Name associated with the new user.

• Please note that you may access the user's roles through st.session_state['roles'].
• Please remember to update the config file (as shown in step 13) after you use this widget.

10. Creating a forgot password widget

• You may use the forgot_password widget to allow a user to generate a new random password.
• The new password will be automatically hashed and saved in the credentials dictionary.
• The widget will return the username, email, and new random password which the developer should then transfer to the user securely.

try:
    username_of_forgotten_password, \
    email_of_forgotten_password, \
    new_random_password = authenticator.forgot_password()
    if username_of_forgotten_password:
        st.success('New password to be sent securely')
        # The developer should securely transfer the new password to the user.
    elif username_of_forgotten_password == False:
        st.error('Username not found')
except Exception as e:
    st.error(e)

Authenticate.forgot_password

Parameters

• location: str, {'main', 'sidebar'}, default 'main'
  • Specifies the location of the forgot password widget.
• fields: dict, optional, default {'Form name':'Forgot password', 'Username':'Username', 'Captcha':'Captcha', 'Submit':'Submit'}
  • Customizes the text of headers, buttons and other fields.
• captcha: bool, default False
  • Specifies the captcha requirement for the forgot password widget, True: captcha required, False: captcha removed.
• clear_on_submit: bool, default False
  • Specifies the clear on submit setting, True: clears inputs on submit, False: keeps inputs on submit.
• key: str, default 'Forgot password'
  • Unique key provided to widget to avoid duplicate WidgetID errors.
• callback: callable, optional, default None
  • Callback function that will be invoked on form submission with a dict as a parameter.

Returns:

• str
  • Username associated with the forgotten password.
• str
  • Email associated with the forgotten password.
• str
  • New plain text password that should be transferred to the user securely.

• Please remember to update the config file (as shown in step 13) after you use this widget.

11. Creating a forgot username widget

• You may use the forgot_username widget to allow a user to retrieve their forgotten username.
• The widget will return the username and email which the developer should then transfer to the user securely.

try:
    username_of_forgotten_username, \
    email_of_forgotten_username = authenticator.forgot_username()
    if username_of_forgotten_username:
        st.success('Username to be sent securely')
        # The developer should securely transfer the username to the user.
    elif username_of_forgotten_username == False:
        st.error('Email not found')
except Exception as e:
    st.error(e)

Authenticate.forgot_username

Parameters

• location: str, {'main', 'sidebar'}, default 'main'
  • Specifies the location of the forgot username widget.
• fields: dict, optional, default {'Form name':'Forgot username', 'Email':'Email', 'Captcha':'Captcha', 'Submit':'Submit'}
  • Customizes the text of headers, buttons and other fields.
• captcha: bool, default False
  • Specifies the captcha requirement for the forgot username widget, True: captcha required, False: captcha removed.
• clear_on_submit: bool, default False
  • Specifies the clear on submit setting, True: clears inputs on submit, False: keeps inputs on submit.
• key: str, default 'Forgot username'
  • Unique key provided to widget to avoid duplicate WidgetID errors.
• callback: callable, optional, default None
  • Callback function that will be invoked on form submission with a dict as a parameter.

Returns:

• str
  • Forgotten username that should be transferred to the user securely.
• str
  • Email associated with the forgotten username.

12. Creating an update user details widget

• You may use the update_user_details widget to allow a logged in user to update their name and/or email.
• The widget will automatically save the updated details in both the credentials dictionary and re-authentication cookie.

if st.session_state['authentication_status']:
    try:
        if authenticator.update_user_details(st.session_state['username']):
            st.success('Entries updated successfully')
    except Exception as e:
        st.error(e)

Authenticate.update_user_details

Parameters

• username: str
  • Specifies the username of the user to update user details for.
• location: str, {'main', 'sidebar'}, default 'main'
  • Specifies the location of the update user details widget.
• fields: dict, optional, default {'Form name':'Update user details', 'Field':'Field', 'First name':'First name', 'Last name':'Last name', 'Email':'Email', 'New value':'New value', 'Update':'Update'}
  • Customizes the text of headers, buttons and other fields.
• clear_on_submit: bool, default False
  • Specifies the clear on submit setting, True: clears inputs on submit, False: keeps inputs on submit.
• key: str, default 'Update user details'
  • Unique key provided to widget to avoid duplicate WidgetID errors.
• callback: callable, optional, default None
  • Callback function that will be invoked on form submission with a dict as a parameter.

Returns:

• bool
  • Status of updating the user details.

• Please remember to update the config file (as shown in step 13) after you use this widget.

13. Updating the configuration file

• Please ensure that the configuration file is re-saved anytime the credentials are updated or whenever the reset_password, register_user, forgot_password, or update_user_details widgets are used.

with open('../config.yaml', 'w') as file:
    yaml.dump(config, file, default_flow_style=False)

License

This project is proprietary software. The use of this software is governed by the terms specified in the LICENSE file. Unauthorized copying, modification, or distribution of this software is prohibited.