PHP, OAuth &
Web Services
By James Broad

You will learn
• How to authenticate a request using
OAuth
• How to use a PHP framework -
CodeIgniter
• How to retrieve web services using YQL

Technologies covered
• SVN
• rsync
• PHP
• CodeIgniter

Project : Search
• Search a number of services using their
Web Service API’s
• Twitter
• Flickr
• Yahoo Search
• Wikipedia

YQL
Yahoo Query Language

YQL Console
http://developer.yahoo.com/yql/console/

SWEET!
Now how do I make use of it?

Copy the generated
URL and go

Nope. Soz, you need
authentication
In the flavour of OAuth

What is OAuth?
I will attempt to explain

The problem
http://www.flickr.com/photos/fabricio/2354662901/ http://www.flickr.com/photos/borkazoid/3219646418/
• http://adactio.com/journal/1357

One Solution - OAuth

OAuth Flow

Demonstration
• Manual 3 Leg OAuth process
• http://carbonsilk.com/oauth/example/
client.php
• Our example uses 2 Leg - no need for the
user to leave the page but we only get
access to public information.

Getting Started
• Getting our development environment set
up
• Obtaining our application keys
• Covering the PHP code needed to run our
application

Development
Environment
• XAMPP - http://www.apachefriends.org/en/
xampp.html
• CodeIgniter Framework
• OAuth Library
• CodeIgniter OAuth Classes

Installing CodeIgniter
svn checkout http://dev.ellislab.com/svn/CodeIgniter/trunk ~/
Sites/project_search

Configuring
CodeIgniter
• Check it works http://localhost/
project_search/
• Can we have pretty URLs? Please?
• change system/applications/config/config.php
• $config['index_page'] = \"\";
• Add .htaccess file

OAuth PHP Library
• svn co http://oauth.googlecode.com/svn/
code/php ~/Sites/oauth/
• Copy OAuth.php to CodeIgniter Library -
system/applications/libraries/
• Change line 369 of OAuth.php - Realm bug.
Add realm as a parameter

YQL / OAuth Classes
I have been nice enough to pre-bake some classes for
you

YQL / OAuth Classes
• system/application/libraries/yql_lib.php
• Copy & Paste from http://gist.github.com/
57536
• system/application/controllers/yql.php
• Copy & Paste from http://gist.github.com/
57535

Obtaining Application
Keys
• Go to https://developer.yahoo.com/
dashboard/ and register a new OAuth
application
• One I made earlier: https://
developer.yahoo.com/dashboard/
success.html?key=xxx

Configuring Our App
• Open system/application/libraries/yql_lib.php
• Add your OAuth key and secret

Upload
• We need to upload to the domain
registered earlier for authentication
• rsync -r --progress ~/Sites/project_search/
you@yoursite.com:~/public_html/
project_search/

Review our framework
code
We look behind what has been installed - The
CodeIgniter Libraries and controllers

Live Code Time
Adding a new query - Scraping the Finance news top
stories and presenting them using a view and a
controller

Thanks!
twitter.com/kulor
carbonsilk.com