Consuming Yahoo! Web
Services from Mac and
iPhone
zach graves
iphonedevcamp III

zach graves
YOS User Experience Design / Prototyping
Focus on 3rd party developers & publishers.
APIs, Web Services, Applications, ...
twitter: @basictheory

SDKs
Current SDK offering:
PHP
ActionScript 3
Cocoa
Python

Cocoa SDK
Objective-C 2.0 library
Simple, Easy to use
Transparent layer between you and the service
Talk to YQL and Yahoo! Social Platform
Use in any Mac or iPhone app
Easy OAuth

What this isn’t
A UI for users to authenticate or login to your app.

What this isn’t
A UI for users to authenticate or login to your app.
Instead a user logs into Yahoo and allows access to
you. (OAuth)

OAuth
“An open protocol to allow secure API
authorization in a simple and standard
method from desktop and web
applications.”

OAuth
Secure mechanism for talking to ‘protected’ web-
services.
Web service provides access to user data or perform
actions on behalf of the user.

OAuth
Understanding the implementation and the flow for
your users.

YOAuth *yet another oauth library*
YOAuthConsumer
YOAuthRequest
YOAuthSignatureMethod
YOAuthSignatureMethod_HMAC-SHA1
YOAuthSignatureMethod_PLAINTEXT
YOAuthToken
YOAuthUtil

YOAuth *yet another oauth library*
Give it your consumer credentials
Signs your URL request
Done

YOSSocial
Give it your OAuth credentials
It will manage the entire OAuth process for you.
Simple methods to create / resume a session.
Automatically fetches tokens as required.
Tokens are saved to user defaults.
(or any other storage mechanism you want)

YOSSocial
// create a session
YOSSession *session = [YOSSession sessionWithConsumerKey:@"dj0yJ...D1mMg"
andConsumerSecret:@"226b...82f91"
andApplicationId:@"9bTLz30"];
// check for any existing session data
// (previously used access token)
BOOL hasSession = [session resumeSession];
// perform any actions based on the result
// ie: show an alert or button to sign in,
// or start loading data
if(hasSession) {
// a valid session exists to fetch/insert data
} else {
// the user needs to login
[session sendUserToAuthorizationWithCallback:nil];
}

OAuth Flow

Demo

YQL
select * from internet
Expressive, SQL-like language to query, filter and join
data across web services
Apps run faster with fewer lines of code and a smaller
network footprint.

Using YQL in Your Apps
Apps run faster with fewer lines of code and a smaller
network footprint.
Let Yahoo! fetch data and do the processing work for
you.
Move it off the device.
Load all your data at once in one request.

query.multi
Open Table that allows you to pass thru a comma-
separated list of YQL queries.
Response is an array containing each result.

query.multi

query.multi
select * from weather.forecast where location=98101

query.multi
YQLQueryRequest *yql = [[YQLQueryRequest alloc] initWithConsumer:session.consumer];
[yql query:@"select * from weather.forecast where location=98101" withDelegate:self];

query.multi
select * from weather.forecast where location=95136;
select * from weather.forecast where location=94089;
select * from weather.forecast where location=90401;
select * from weather.forecast where location="SPXX0015";
select * from weather.forecast where location="UKXX0085";
select * from weather.forecast where location="USWA0395";

query.multi
NSArray *wLocations = [NSArray arrayWithObjects:@"95136", @"94089", @"90401",
@"SPXX0015", @"UKXX0085", @"USWA0395", nil];
NSString *wMultiQuery = @"";
for(int i=0;i<[wLocations count];i++) {
NSString *wlocation = [wLocations objectAtIndex:i];
NSString *weatherQuery = [NSString stringWithFormat:@"select * from
weather.forecast where location='%@';", wlocation];
wMultiQuery = [wMultiQuery stringByAppendingString: weatherQuery];
}
NSString *yqlQuery = [NSString stringWithFormat:@"select * from query.multi where
queries="%@";", wMultiQuery];
YQLQueryRequest *yql = [[YQLQueryRequest alloc] initWithConsumer:session.consumer];
[yql query: yqlQuery withDelegate:self];

GitHub
http://github.com/yahoo/
http://github.com/yql/

Contact:
Zach Graves
zachg@yahoo-inc.com
@basictheory
http://developer.yahoo.com/social/sdk/
http://github.com/yahoo/yos-social-obj/