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<!DOCTYPE html>
<html>
<head>
<title>Reading data from APIs</title>
<meta charset="utf-8">
<meta name="description" content="Reading data from APIs">
<meta name="author" content="Jeffrey Leek">
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<body style="opacity: 0">
<slides class="layout-widescreen">
<!-- LOGO SLIDE -->
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<slide class="title-slide segue nobackground">
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<img src="../../assets/img/bloomberg_shield.png">
</aside>
<hgroup class="auto-fadein">
<h1>Reading data from APIs</h1>
<h2></h2>
<p>Jeffrey Leek<br/>Johns Hopkins Bloomberg School of Public Health</p>
</hgroup>
</slide>
<!-- SLIDES -->
<slide class="" id="slide-1" style="background:;">
<hgroup>
<h2>Application programming interfaces</h2>
</hgroup>
<article>
<p><img class=center src=../../assets/img/03_ObtainingData/twitter.png height= 450/></p>
<p><a href="https://dev.twitter.com/docs/api/1/get/blocks/blocking">https://dev.twitter.com/docs/api/1/get/blocks/blocking</a></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-2" style="background:;">
<hgroup>
<h2>Creating an application</h2>
</hgroup>
<article>
<p><img class=center src=../../assets/img/03_ObtainingData/twitterapp1.png height= 450/></p>
<p><a href="https://dev.twitter.com/appsmyapp%20%3C-%20oauth_app(%22twitter%22,%20key%20=" title="TYrWFPkFAkn4G5BbkWINYw">https://dev.twitter.com/apps</a>)</p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-3" style="background:;">
<hgroup>
<h2>Creating an application</h2>
</hgroup>
<article>
<p><img class=center src=../../assets/img/03_ObtainingData/twitterapp2.png height= 450/></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-4" style="background:;">
<hgroup>
<h2>Creating an application</h2>
</hgroup>
<article>
<p><img class=center src=../../assets/img/03_ObtainingData/twitterapp3.png height= 450/></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-5" style="background:;">
<hgroup>
<h2>Accessing Twitter from R</h2>
</hgroup>
<article>
<pre><code class="r">myapp = oauth_app("twitter",
key="yourConsumerKeyHere",secret="yourConsumerSecretHere")
sig = sign_oauth1.0(myapp,
token = "yourTokenHere",
token_secret = "yourTokenSecretHere")
homeTL = GET("https://api.twitter.com/1.1/statuses/home_timeline.json", sig)
</code></pre>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-6" style="background:;">
<hgroup>
<h2>Converting the json object</h2>
</hgroup>
<article>
<pre><code class="r">json1 = content(homeTL)
json2 = jsonlite::fromJSON(toJSON(json1))
json2[1,1:4]
</code></pre>
<pre><code> created_at id id_str
1 Mon Jan 13 05:18:04 +0000 2014 4.225984e+17 422598398940684288
text
1 Now that P. Norvig's regex golf IPython notebook hit Slashdot, let's see if our traffic spike tops the previous one: http://t.co/Vc6JhZXOo8
</code></pre>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-7" style="background:;">
<hgroup>
<h2>How did I know what url to use?</h2>
</hgroup>
<article>
<p><img class=center src=../../assets/img/03_ObtainingData/twitterurl.png height= 450/></p>
<p><a href="https://dev.twitter.com/docs/api/1.1/get/search/tweets">https://dev.twitter.com/docs/api/1.1/get/search/tweets</a></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-8" style="background:;">
<hgroup>
<h2>In general look at the documentation</h2>
</hgroup>
<article>
<p><img class=center src=../../assets/img/03_ObtainingData/twitterdocs.png height= 450/></p>
<p><a href="https://dev.twitter.com/docs/api/1.1/overview">https://dev.twitter.com/docs/api/1.1/overview</a></p>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="" id="slide-9" style="background:;">
<hgroup>
<h2>In general look at the documentation</h2>
</hgroup>
<article>
<ul>
<li>httr allows <code>GET</code>, <code>POST</code>, <code>PUT</code>, <code>DELETE</code> requests if you are authorized</li>
<li>You can authenticate with a user name or a password</li>
<li>Most modern APIs use something like oauth</li>
<li>httr works well with Facebook, Google, Twitter, Githb, etc. </li>
</ul>
</article>
<!-- Presenter Notes -->
</slide>
<slide class="backdrop"></slide>
</slides>
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