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RESTful API Automation with JavaScript

Pragmatic RESTful API principles, along with a solid consumption architecture, can allow for a great amount of automation in your program development. At the same time, securing the application can be extremely tricky from JavaScript. In this session we will explore several principles behind RESTful API design and consumption using JavaScript, many of the standards that were integrated in the redevelopment of the PayPal API architecture in the new RESTful APIs. We will cover many of these architecture standards, including: * Building in action automation using HATEOAS * OAuth 2 in the JavaScript model * The challenges behind secure resource consumption through JavaScript

jcleblanc
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RESTful API Automation with JavaScript

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  1. RESTful API Automation With JavaScript Jonathan LeBlanc Head of Developer Evangelism (North America) Github: http://github.com/jcleblanc Slides: http://slideshare.net/jcleblanc Twitter: @jcleblanc

  2. What We’re Covering REST Concepts Automation through hypermedia constraints OAuth 2 in JavaScript

  3. What We Want

  4. JavaScript Challenges

  5. Cross Origin Resource Sharing Access to other domains / subdomains is restricted (same origin policy) JSONP to request resources across domains Cross-origin resource sharing (CORS) You Send: Origin: http://site.com They Send: Access-Control-Allow-Origin: http://site.com

  6. Keeping Things Hidden Token based auth mechanism OAuth: Client Secret Basic Auth: Password API request action to reaction mapping A schematic for how data forces site changes

  7. Action Automation

  8. RESTful API Core Concepts Honor HTTP request verbs Use proper HTTP status codes No version numbering in URIs Return format via HTTP Accept header Double Rainbow: Discovery via HATEOAS

  9. Uniform Interface Sub-Constraints Resource Identification Resources must be manipulated via representations Self descriptive messages Hypermedia as the engine of application state

  10. How we Normally Consume APIs

  11. Using HATEOAS to Automate

  12. "links": [ { "href":"https://api.sandbox.paypal.com/v1/payments/ authorization/6H149011U8307001M", "rel":"self", "method":"GET" },{ "href":"https://api.sandbox.paypal.com/v1/payments/ authorization/6H149011U8307001M/capture", "rel":"capture", "method":"POST" },{ "href":"https://api.sandbox.paypal.com/v1/payments/ authorization/6H149011U8307001M/void", "rel":"void", "method":"POST" } ]

  13. OAuth 2 & JavaScript?

  14. A Little Use Background User login User Involvement Application only

  15. User Agent Flow: Redirect Prepare the Redirect URI Authorization Endpoint client_id response_type (token) scope redirect_uri Browser Redirect Redirect URI

  16. User Agent Flow: Redirect Building the redirect link var auth_uri = auth_endpoint + "?response_type=token" + "&client_id=" + client_id + "&scope=profile" + "&redirect_uri=" + window.location; $("#auth_btn").attr("href", auth_uri);

  17. User Agent Flow: Hash Mod Fetch the Hash Mod access_token refresh_token expires_in Extract Access Token

  18. User Agent Flow: Hash Mod Extracting the access token from the hash http://site.com/callback#access_token=rBEGu1FQr5 4AzqE3Q&refresh_token=rEBt51FZr54HayqE3V4a& expires_in=3600 var hash = document.location.hash; var match = hash.match(/access_token=(\w+)/);

  19. User Agent Flow: Get Resources Set Request Headers + URI Resource Endpoint Header: token type + access token Header: accept data type HTTPS Request

  20. User Agent Flow: Get Resources Making an authorized request $.ajax({ url: resource_uri, beforeSend: function (xhr) { xhr.setRequestHeader('Authorization', 'OAuth ' + token); xhr.setRequestHeader('Accept', 'application/json'); }, success: function (response) { //use response object } });

  21. Good JavaScript API Interaction Using Proper REST standards Automation through hypermedia constraints Using OAuth 2 appropriately

  22. Thank You! Questions? http://bit.ly/rest_automation_js Jonathan LeBlanc Head of Developer Evangelism (North America) Github: http://github.com/jcleblanc Slides: http://slideshare.net/jcleblanc Twitter: @jcleblanc

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