http://barcampbangalore.org/bcb/bcb12/google-apis-and-google-app-engine-introduction-demo

1. Introduction to Google APIs
August 25, 2012
Sivasubramaniam Arunachalam
http://barcampbangalore.org/bcb/bcb12/google-apis-and-google-app-engine-introduction-demo

2. http://www.ebaypartnernetworkblog.com/en/files/2011/05/api1.gif

3. Agenda
• What is an API?
• REST - Introduction
• Google APIs
• Demo

4. API
“Specification intended to be used as an interface
by software components to communicate with
each other”

5. Language Dependent APIs
• Python (pydoc)
• Ruby (ri)
• Perl (perldoc)
• Java (javadoc)
• Unix (man)

6. Language Independent APIs
• RPCs
• CORBA
• Web Services

7. Evolution
• Web 2.0 & 3.0
• Web Services
"A software system designed to support
interoperable machine-to-machine interaction
over a network" (W3C)

8. Web APIs
• HTTP, HTTP & HTTP
• XML
• JSON
• Mash-ups
• Enterprise
• Consumer
• Data

9. Web Services
• SOAP
• Heavy Weight
• Suitable for Enterprises
• REST
• Light Weight
• Suitable for Web APIs

10. Why REST?
• Ease of Development & Deployment
• Serves the actual purpose of HTTP
• Cache Proxies
• Human readable results
• Flexile Formats
• Better Performance
• Better Browser Support
• Social Media Authentication

11. REST - Introduction
• Architectural Style
• Uses only HTTP
• Stateless
• Clean URL (Slugs & SEO)

12. REST - Components
• Origin Servers
• Gateways
• Proxies
• Clients
• Client (Requested By)
• Server (Provided By)
• Resource (What is being exchanged)
• Representation

13. REST - Methods
• GET
• PUT
• POST
• DELETE
http://provider.com/resources/
http://provider.com/resources/entry05

14. REST – Methods (GET)
http://provider.com/resources/
http://provider.com/resources/entry05
•List
•Retrieve

15. REST – Methods (PUT & POST)
http://provider.com/resources/
http://provider.com/resources/entry05
•Replace
•Replace/Create

16. REST – Methods (DELETE)
http://provider.com/resources/
http://provider.com/resources/entry05
•Delete the List
•Delete the Entry

17. PUT vs POST
• Explicit URL Name in request (PUT)
• Idempotent (PUT)
• No Duplicate
• PUT - Same URL for (Create/Update)

18. PUT
• /resources/<existing_resource> (update)
• /resources/<new_resource> (Create)

19. POST
• /resources (Create and URL will be returned)
• /resources/<existing_resource> (Update)
• /resources/<new_resource> (Error)

20. OAuth 2.0 Flow
http://tutorials.jenkov.com/oauth2/overview.html

21. OAuth 2.0 Flow (Contd…)
http://www.ibm.com/developerworks/library/x-androidfacebookapi/index.html

22. Google APIs
• Data APIs (Demo in few minutes)
• Ajax APIs
• JS & HTML
• Rich dynamic web sites
• Ads APIs
• Adsense
• Adwords
• (SOAP Based)

23. Google Data APIs
• 46 Apps
• Tools
• API Explorer
• API Console
• OAuth 2.0 Playground

24. Demo
• Discovery
• Books
• URL Shorter
• Tasks
• Google +
• Others

25. Questions (?)

26. Thank You!
siva@sivaa.in
@sivaa_in

27. References
• http://en.wikipedia.org/wiki/Application_programming_interface
• http://en.wikipedia.org/wiki/Representational_state_transfer
• http://en.wikipedia.org/wiki/Google_Code
• http://googlecode.blogspot.in/2009/08/well-earned-retirement-for-soap-search.html
• http://stackoverflow.com/questions/6166746/why-use-soap-for-webservices
• http://stackoverflow.com/questions/630453/put-vs-post-in-rest
• http://stackoverflow.com/questions/3487991/why-does-oauth-v2-have-both-access-and-refresh-tokens

28. Tweets
http://1photos.com/wp-content/uploads/2011/02/wpid-web_delight_s37_15_part.jpg

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