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Django app for accessing the EVE Swagger Interface (ESI).

Project description

django-esi

Django app for easy access to the EVE Swagger Interface (ESI)

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Overview

Django-esi is a Django app that provides an interface for easy access to the EVE Swagger Interface (ESI), the official API for the game EVE Online.

It is build upon Bravado - a python client library for Swagger 2.0 services.

Django-esi adds the following main functionalities to a Django site:

  • Dynamically generated client for interacting with public and private ESI endpoints
  • Support for adding EVE SSO to authenticate characters and retrieve tokens
  • Control over ESI endpoint versions

Installation

  1. Install the latest version directly from PyPI:

    pip install django-esi

  2. Add esi to your INSTALLED_APPS setting:

    INSTALLED_APPS += 'esi'

  3. Include the esi urlconf in your project's urls:

    url(r'^sso/', include('esi.urls', namespace='esi')),

  4. Register an application with the EVE Developers site

    If your application requires scopes, select Authenticated API Access and register all possible scopes your app can request. Otherwise Authentication Only will suffice. Set the Callback URL to https://example.com/sso/callback

  5. Add SSO client settings to your project settings:

    ESI_SSO_CLIENT_ID = "my client id"
    ESI_SSO_CLIENT_SECRET = "my client secret"
    ESI_SSO_CALLBACK_URL = "https://example.com/sso/callback"

  6. Run python manage.py migrate to create models.

Usage in views

When views require a token, wrap with the token_required decorator and accept a token arg:

from esi.decorators import token_required

@token_required()
def my_view(request, token):
    ...

This will prompt the user to either select a token from their current ones, or if none exist create a new one via SSO.

To specify scopes, add either a list of names or a space-delimited string:

@token_required(scopes=['esi-location.read_ship_type.v1', 'esi-location.read_location.v1'])
@token_required(scopes='esi-location.read_ship_type.v1 esi-location.read_location.v1')

To require a new token, such as for logging in, add the new argument:

@token_required(new=True)

To request all of a user's tokens which have the required scopes, wrap instead with the tokens_required decorator and accept a tokens arg:

@tokens_required(scopes='esi-location.read_ship_type.v1')
def my_view(request, tokens):
    # my code

This skips prompting for token selection and instead passes that responsibility to the view. Tokens are provided as a queryset.

Accessing ESI

django-esi provides a convenience wrapper around the bravado SwaggerClient.

Getting a client

To get a SwaggerClient configured for ESI, call the factory:

from esi.clients import esi_client_factory

client = esi_client_factory()

Accessing authenticated endpoints

To get an authenticated SwaggerClient, add the token argument:

client = esi_client_factory(token=my_token)

Or, get the client from the specific token model instead:

client = my_token.get_esi_client()

Authenticated clients will auto-renew tokens when needed, or raise a TokenExpiredError if they aren't renewable.

Specifying resource versions

As explained on the EVE Developers Blog, it's best practice to call a specific version of the resource and allow the ESI router to map it to the correct route, being legacy, latest or dev.

Client initialization begins with a base swagger spec. By default this is the version defined in settings (ESI_API_VERSION), but can be overridden with an extra argument to the factory:

client = esi_client_factory(version='v4')
client = token.get_esi_client(version='v4')

Only resources with the specified version number will be available. For instance, if you specify v4 but Universe does not have a v4 version, it will not be available to that specific client. Only legacy, latest and dev are guaranteed to have all resources available.

Individual resources are versioned and can be accessed by passing additional arguments to the factory:

client = esi_client_factory(Universe='v1', Character='v3')
client = token.get_esi_client(Universe='v1', Character='v3')

A list of available resources is available on the EVE Swagger Interface browser. If the resource is not available with the specified version, an AttributeError will be raised.

This version of the resource replaces the resource originally initialized. If the requested base version does not have the specified resource, it will be added.

Note that only one old revision of each resource is kept available through the legacy route. Keep an eye on the deployment timeline for resource updates.

Using a local spec file

Specifying resource versions introduces one major problem for shared code: not all resources nor all their operations are available on any given version. This can be addressed by shipping a copy of the versioned latest spec with your app. This is the preferred method for deployment.

To build a client using this local spec, pass an additional kwarg spec_file which contains the path to your local swagger.json:

c = esi_client_factory(spec_file='/path/to/swagger.json')

For example, a swagger.json in the current file's directory would look like:

c = esi_client_factory(
    spec_file=os.path.join(os.path.dirname(os.path.abspath(__file__)), 
    'swagger.json')
)

If a spec_file is specified all other versioning is unavailable: ensure you ship a spec with resource versions your app can handle.

Accessing alternate data sources

ESI data source can also be specified during client creation:

client = esi_client_factory(datasource='tranquility')

Available data sources are tranquility and singularity.

Cleaning the database

Two tasks are available:

  • cleanup_callbackredirect removes all CallbackRedirect models older than a specified age (in seconds). Default is 300.
  • cleanup_token checks all Token models, and if expired, attempts to refresh. If expired and cannot refresh, or fails to refresh, the model is deleted.

To schedule these automatically with celerybeat, add them to your settings.py CELERYBEAT_SCHEDULE dict like so:

from celery.schedules import crontab

CELERYBEAT_SCHEDULE = {
    ...
    'esi_cleanup_callbackredirect': {
        'task': 'esi.tasks.cleanup_callbackredirect',
        'schedule': crontab(hour='*/4'),
    },
    'esi_cleanup_token': {
        'task': 'esi.tasks.cleanup_token',
        'schedule': crontab(day_of_month='*/1'),
    },
}

Recommended intervals are four hours for callback redirect cleanup and daily for token cleanup (token cleanup can get quite slow with a large database, so adjust as needed). If your app does not require background token validation, it may be advantageous to not schedule the token cleanup task, instead relying on the validation check when using @token_required decorators or adding .require_valid() to the end of a query.

Operating on singularity

By default, django-esi process all operations on the tranquility cluster. To operate on singularity instead, two settings need to be changed:

  • ESI_OAUTH_URL should be set to https://sisilogin.testeveonline.com/oauth
  • ESI_API_DATASOURCE should be set to singularity

Note that tokens cannot be transferred between servers. Any tokens in the database before switching to singularity will be deleted next refresh.

History of this app

This app is a fork from adarnauth-esi. Since this app is an important component of the Alliance Auth system and Adarnof - the original author - was no longer able to maintain it the AA dev team has decided in December 2019 to take over maintenance and further developing for this app within the Alliance Auth project.

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