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aRESTful Development with the Wordpress API By Jeremy Lindblom (@jeremeamia)

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@jeremeamia

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Stuff I Work On ✘ API Designs ✘ API Clients ( e.g., AWS SDK for PHP ) ✘ API Reviews ✘ API Documentation ✘ PHP Libraries ( e.g., Guzzle ) ✘ Testing & Code Quality

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“There's always money in the banana stand!”

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http://v2.wp-api.org

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UI API

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API

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API

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“Headless” WordPress

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“Come on!”

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Getting Started Installing Support for the WP REST API

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Step 1 Step 2

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Step 3

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Step 4 Code

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Step 4 Code composer require guzzlehttp/guzzle

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require 'vendor/autoload.php'; $client = new GuzzleHttp\Client([ 'base_uri' => $host . '/wp-json/wp/v2/', 'auth' => ['test', 'j6gk 1Jsh uokR y5vT'], ]); $response = $client->get('posts'); $result = json_decode($response->getBody()); Step 4

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Array( [0] => Array( [id] => 6 [date] => 2016-05-11T04:12:29 [date_gmt] => 2016-05-11T04:12:29 [guid] => Array( [rendered] => http://example.com/?p=6 ) [modified] => 2016-05-11T04:12:29 [modified_gmt] => 2016-05-11T04:12:29 [slug] => great-post [type] => post [link] => http://example.com/2016/05/11/great-post/ [title] => Array( [rendered] => Great Post ) ... Step 5: Profit!

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The Nitty-Gritties Details About How the API Works

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API Docs

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API Docs

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Supported Resources ✘ Posts ✘ Post Revisions ✘ Pages ✘ Media ✘ Post Types ✘ Post Statuses ✘ Comments ✘ Taxonomies ✘ Categories ✘ Tags ✘ Users

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Supported Operations ✘ Create ⇒ POST ✘ Read ⇒ GET ✘ Update ⇒ POST ✘ Delete ⇒ DELETE ✘ List ⇒ GET

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General Parameters ✘ _jsonp ✘ _method ✘ _envelope ✘ _embed

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Have any of you heard of the “Hypertext Application Language”?

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Have any of you heard of the “Hypertext Application Language”? “I don’t understand the question and I won’t respond to it.”

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Hypermedia Linking Resources With the HAL Spec

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HAL = Hypertext Application Language Spec for hyperlinking resources Makes your API “explorable” “Simple” format to consume Uses _links & _embedded

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require 'vendor/autoload.php'; $client = new GuzzleHttp\Client([...]); $response = $client->get('posts/6'); $result = json_decode($response->getBody());

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[id] => 6 [slug] => great-post ... [_links] => Array( [collection] => Array( [0] => Array( [href] => http://demo.wp-api.org/wp-json/wp/v2/posts ) ) [author] => Array( [0] => Array( [embeddable] => 1 [href] => http://demo.wp-api.org/wp-json/wp/v2/users/1 ) ) ... )

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“I’m here to see the magic”

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$client->get('posts/6?_embed=1');

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[id] => 6 [slug] => great-post ... [_links] => Array(...) [_embedded] => Array( [author] => Array( [0] => Array( [id] => 1 [name] => Jeremy Lindblom [slug] => jeremeamia ... [_links] => Array(...) ) ) )

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[id] => 6 [slug] => great-post ... [_links] => Array(...) [_embedded] => Array( [author] => Array( [0] => Array( [id] => 1 [name] => Jeremy Lindblom [slug] => jeremeamia ... [_links] => Array(...) ) ) ) Yay! Recursion!

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[id] => 6 [slug] => great-post ... [_links] => Array(...) [_embedded] => Array( [author] => Array( [0] => Array( [id] => 1 [name] => Jeremy Lindblom [slug] => jeremeamia ... [_links] => Array(...) ) ) ) “Simple” “Explorable”

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“I’m a monster!”

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HAL Data Model

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Authentication Giving Your Consumers Access

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Types of Authentication ✘ Cookie Authentication ✘ OAuth Authentication ✘ Application Passwords ✘ Basic Auth

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“ I was never really clear on that.”

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Types of Authentication ✘ Cookie Authentication ✘ OAuth Authentication ✘ Application Passwords ✘ Basic Auth

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require 'vendor/autoload.php'; $client = new GuzzleHttp\Client([ 'base_uri' => $host . '/wp-json/wp/v2/', 'auth' => ['test', 'j6gk 1Jsh uokR y5vT'], ]); $response = $client->get('posts'); $result = json_decode($response->getBody());

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GET /wp-json/wp/v2/posts HTTP/1.1 Host: http://demo.wp-api.org User-Agent: GuzzleHttp/6.2.0 curl/7.43.0 PHP/5.6.12 Authorization: Basic dGVzdC1jbGllbnQ6ZlpuBrYyIHNtQjkgWmtqVw== HTTP Basic Authentication

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GET /wp-json/wp/v2/posts HTTP/1.1 Host: http://demo.wp-api.org User-Agent: GuzzleHttp/6.2.0 curl/7.43.0 PHP/5.6.12 Authorization: Basic dGVzdC1jbGllbnQ6ZlpuBrYyIHNtQjkgWmtqVw== base64_encode(“{$username}:{$password}”) e.g., base64_encode(‘test:j6gk 1Jsh uokR y5vT’)

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“hot ham water”

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Types of Authentication ✘ Cookie Authentication ✘ OAuth Authentication ✘ Application Passwords ✘ Basic Auth

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Types of Authentication ➔ Cookies + NONCE ➔ Designed for JavaScript ➔ Use within themes/plugins ➔ Session-based ➔ Safe for HTTP ✘ Cookie Authentication ✘ OAuth Authentication ✘ Application Passwords ✘ Basic Auth

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Types of Authentication ➔ 3-legged OAuth 1.0a ➔ Requires Plugin ➔ Session-based ➔ Safe for HTTP ➔ Most recommended ✘ Cookie Authentication ✘ OAuth Authentication ✘ Application Passwords ✘ Basic Auth

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Types of Authentication ➔ HTTP Basic Auth ➔ Requires Plugin ➔ Application-based ➔ USE HTTPS! ➔ Easily Revokable ✘ Cookie Authentication ✘ OAuth Authentication ✘ Application Passwords ✘ Basic Auth

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Types of Authentication ➔ HTTP Basic Auth ➔ Requires Plugin ➔ Application-based ➔ USE HTTPS! ➔ Uses Admin’s credentials! ✘ Cookie Authentication ✘ OAuth Authentication ✘ Application Passwords ✘ Basic Auth

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GET /wp-json/wp/v2/posts HTTP/1.1 Host: http://demo.wp-api.org User-Agent: GuzzleHttp/6.2.0 curl/7.43.0 PHP/5.6.12 Authorization: Basic aGVz47gjbGllbcf9ZlpuBrYIHNtQjkgWmtqVw8= base64_encode(admin:p@$$w0rd12345’)

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“I’ve made a huge mistake”

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Types of Authentication ➔ Easy setup ➔ Requires Plugin ➔ HTTP Basic Auth ➔ Application-based ➔ USE HTTPS! ➔ DEVELOPMENT ONLY! DO NOT DISTRIBUTE YOUR CREDENTIALS! ✘ Cookie Authentication ✘ OAuth Authentication ✘ Application Passwords ✘ Basic Auth

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Tools & Resources Working Effectively with the Wordpress API

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Tools ✘ Wordpress itself

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$auth = base64_encode("{$user}:{$pass}"); $response = wp_remote_post( rest_url('wp/v2/posts/1'), [ 'method' => 'POST', 'headers' => [ 'Authorization' => "Basic {$auth}", ], 'body' => $data ] );

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wp.api.loadPromise.done(function() { var post = new wp.api.models.Post({ title: 'This is a test post' }); post.save(); });

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Tools ✘ Wordpress itself ✘ Recommended in Docs: ✗ https://github.com/WP-API/example-client ✗ https://github.com/WP-API/client-cli ✗ https://github.com/WP-API/api-console ✘ HTTP Clients (Guzzle, cURL, etc.)

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THANKS! Any questions? You can find me at... ✘ @jeremeamia ✘ jeremeamia@gmail.com ✘ the @azPHP Meetups