[SOLVED] CS Context-aware computing &

Context-aware computing &
Web-based APIs
Mobile and Ubiquitous Computing
Sandy Gould [email protected]
22nd February 2021

Presentation
Context-aware computing & Web-based APIs Sandy Gould, University of Birmingham 22nd February 2021

Execution
Context-aware computing & Web-based APIs Sandy Gould, University of Birmingham 22nd February 2021

Tagging
Context-aware computing & Web-based APIs Sandy Gould, University of Birmingham 22nd February 2021

APIs
Were going to talk about the Twitter API and the Strava API.
Im going to show you some flows and some example code.
The example code is not something you need to fully understand, but I think it helps to see real examples.
Context-aware computing & Web-based APIs Sandy Gould, University of Birmingham 22nd February 2021

Example API Twitter
bit.ly/twitter-api-docs
Context-aware computing & Web-based APIs Sandy Gould, University of Birmingham 22nd February 2021

REST and JSON the Twitter API
consumerKey consumerKeySecret
requestToken
User Agreement (Browser) PIN
Callback
PIN Validate
accessTokenKey accessTokenSecret
Context-aware computing & Web-based APIs Sandy Gould, University of Birmingham 22nd February 2021

Demo client
Authentication is usually the most difficult part of interacting with most APIs.
Once youre in, theyre quite easy to manipulate.
Lets look at a Twitter client that tweets from @MUC_Teaching.
Context-aware computing & Web-based APIs Sandy Gould, University of Birmingham 22nd February 2021

Inconsistencies
For complex APIs that have been developed over a long period of time, names can get confusing.
{
aspect_type: update,
event_time: 1516126040,
object_id: 1360128428,
object_type: activity,
owner_id: 134815,
subscription_id: 120475,
updates: {
title: Messy
}
}
{
id : 12345678987654321,
resource_state : 3,
external_id : some-uid,
upload_id : 98765432123456789,
athlete : {
id : 134815,
resource_state : 1
},
[] }
Context-aware computing & Web-based APIs Sandy Gould, University of Birmingham 22nd February 2021

REST and JSON the Twitter API
Client ID Callback URL
User Agreement (Browser)
Authorization Token
Callback
Swap auth for access tokens
Access Token* Refresh Token
*TTL 6hrs
Context-aware computing & Web-based APIs Sandy Gould, University of Birmingham 22nd February 2021

Kahoot! Time! Now!
goto:
kahoot.it
Context-aware computing & Web-based APIs Sandy Gould, University of Birmingham 22nd February 2021