Mobile Vikings OAuth API Client
OAuth is an authorization protocol that allows applications (a balance checker on your Android phone, for example) to consume user data from a service provider (the Mobile Vikings API) data without having to know the user’s credentials. The mvoauthapi package contains a client for the Mobile Vikings API with OAuth support.
Run the following command in the directory containing this README file:
python setup.py install
The call.py file contains a sample implementation that calls the Mobile Vikings API using the OAuth client. To request the balance on a SIM card, for example, execute the following command:
python call.py sim_balance add_price_plan=1
You will be prompted for a consumer key and secret. These credentials can be found on your Mobile Vikings account settings page.
Visit the API documentation page for an overview of the available methods and their arguments.
If the xAuth extension has been enabled for your consumer, you can test it by passing the -x option to call.py. You will be prompted for an account’s username and password instead of being redirected to the Mobile Vikings site. Note that xAuth is not enabled by default. If you’re developing a mobile app and want to use it, email us at mailto:firstname.lastname@example.org.
call.py will store your consumer credentials and tokens in ~/.mvoauthapi.cfg so you don’t have to re-enter your data and go through the access token request process each time you make a call.
The OAuth protocol implements authorization by exchanging tokens. First, the application fetches a request token with a given callback URL. Using this token, it can redirect the user to an authorization URL on the Mobile Vikings site. On this page, the user is asked if she wants to grant permission to the application. If she does, she is redirected to the callback URL that now contains a verification code. The application can then use the verification code to request an access token. With this access token, the API calls can finally be made.
from mvoauthapi.client import ApiClient, Token api = ApiClient(consumer_key, consumer_secret) api.fetch_request_token(callback='http://my-app.com/access_granted') url = api.make_authorization_url()
Now, redirect the user to the authorization URL. If she accepts, she will be redirected to the access_granted page of your site. There will be oauth_verifier and oauth_token GET query parameters present in the URL. Pass them to the client and fetch the access token.
request_key = request.GET['oauth_token'] request_secret = '' # Fetch this from your session or db. verifier = request.GET['oauth_verifier'] request_token = Token(request_key, request_secret) request_token.set_verifier(verifier) api = ApiClient(consumer_key, consumer_secret) api.set_request_token(request_token) access_token = api.fetch_access_token()
You can now use the api object to make calls.
Note: if you don’t want to use a redirect to your application’s site, omit the callback argument in the fetch_request_token call. The Mobile Vikings API will then display the verification code to the user when access has been granted.
Simply call fetch_access_token_via_xauth() after initializing the client. It is imperative that you do not store the user’s credentials. Use them once to request the access token and discard them afterwards. From then on, use the access token to make calls.
api = ApiClient(consumer_key, consumer_secret) api.fetch_access_token_via_xauth(username, password) api.get('sim_balance')
Your application can re-use the access token once it has been acquired; you need not go through the authorization process again. The token will stay valid until the user revokes it.
api = ApiClient(consumer_key, consumer_secret) api.set_access_token(access_token) api.get('sim_balance')
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