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

YQLYahoo Query Language

YQL Consolehttp://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://adactio.com/journal/1357

http://www.flickr.com/photos/borkazoid/3219646418/http://www.flickr.com/photos/fabricio/2354662901/

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 CodeIgnitersvn 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 ClassesI 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 TimeAdding a new query - Scraping the Finance news top

stories and presenting them using a view and a controller

Thanks!twitter.com/kulorcarbonsilk.com