Eve Auth JWT

An OAuth 2 JWT token validation module for Eve.

Installation

To install eve-auth-jwt, simply:

$ pip install eve-auth-jwt

At Eve initialization:

from eve import Eve
from eve_auth_jwt import JWTAuth

app = Eve(auth=JWTAuth, settings=SETTINGS)

Configuration

This module reads its configuration form Eve settings. Here is the list of new directives:

• JWT_SECRET (required): Defines the symetric secret token secret used to de/encode the token (async keys support is a TODO).
• JWT_ISSUER (required): Defines the required token issuer (iss claim).
• JWT_AUDIENCES: Defines a list of accepted audiences (aud claim). If not provided, only tokens with no audience set will be accepted. The resource level audiences parameter is also available.
• JWT_ROLES_CLAIM: Defines the claim name for roles. If set, Eve roles check will be activated, and any resources with allowed_roles set will require to have those roles present in the defined token's claim.
• JWT_SCOPE_CLAIM: Defines the claim name for scope. If set and the token has a claim of the same name containing the string viewer, only GET and HEAD methods will be granted. All other values are ignored and added to the list of exposed roles with the scope: prefix.

Reading Roles

If access is granted, the authentication module exposes roles and token's claims thru get_authen_roles() and get_authen_claims() methods. You may access those values from your event hook as follow:

def my_hook(...)
    resource_def = app.config['DOMAIN'][resource_name]
    auth = resource_def['authentication']
    if 'somerole' in auth.get_authen_roles():
        # grant some finer access

Securing custom routes

JWT Authorization can be applied to any custom routes using the @requires_token wrapper. This annotation will only provide audience and role access control. User level access must be written manually.

Example of audience access control:

from eve_auth_jwt import requires_token, get_request_auth_value

@app.route('/my_resource/download', methods=['GET'])
@requires_token(audiences=['myAudience'])
def csv_download():
    # Allows all users with myAudience to access download
    account_id = get_request_auth_value()
    if check_user(account_id):

        abort(401)

    return generateCSV(account_id)

Example of myAdmin access control:

from eve_auth_jwt import requires_token

@app.route('/admin/my_resource/download', methods=['GET'])
@requires_token(audiences=['myAudience'], allowed_roles=['myAdmin'])
def csv_download():
    account_id = request.args.get('account_id', None)
    return generateCSV(account_id)

Access the parsed JWT token values

The parsed JWT token values are stored in the flask.g dict, but custom functions exist to aid in reading the values. The values are only available after the JWT token integrity check and user authorization occurs.

Example of access the parse JWT token fields:

from eve_auth_jwt import get_request_auth_value, get_authen_claims, get_authen_roles

def my_fn():
    # Request authentication value as a str
    account_id = get_request_auth_value()

    # JWT claims as a dict[str]
    payload = get_authen_claims()

    # Roles as arr[str]
    roles = get_authen_roles()

Different JWTAuth on different endpoints

Eve supports both global authentication of the whole API, and endpoint-level authentication. If one wish to use different secret keys and/or issuers on certain endpoints, it is possible to create instances of JWTAuth which overrides the global config values of JWT_SECRET and JWT_ISSUER.

The secret key and issuer can be set through the JWTAuth constructor or as properties on instances of JWTAuth.

Example usage:

from eve import Eve
from eve_auth_jwt import JWTAuth

second_auth = JWTAuth('custom secret', 'specific issuer')

app = Eve(auth=JWTAuth, settings=SETTINGS)

@app.route('/second')
@second_auth.requires_token()
def different_secret():
    return 'Success with custom secret!'

Licenses

All source code is licensed under the MIT License.