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wp-content/plugins/copy-delete-posts/analyst/src/ApiRequestor.php

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+<?php
+
+namespace Analyst;
+
+use Exception;
+use Analyst\Contracts\HttpClientContract;
+use Analyst\Contracts\RequestorContract;
+
+class ApiRequestor implements RequestorContract
+{
+	/**
+	 * Supported http client
+	 *
+	 * @var HttpClientContract
+	 */
+	protected $httpClient;
+
+	/**
+	 * @var string
+	 */
+	protected $clientId;
+
+	/**
+	 * @var string
+	 */
+	protected $clientSecret;
+
+	/**
+	 * @var string
+	 */
+	protected $apiBase;
+
+	/**
+	 * Default headers to be sent
+	 *
+	 * @var array
+	 */
+	protected $defaultHeaders = [
+		'accept' => 'application/json',
+		'content-type' => 'application/json'
+	];
+
+	/**
+	 * Prioritized http clients
+	 *
+	 * @var array
+	 */
+	protected $availableClients = [
+		'Analyst\Http\WordPressHttpClient',
+		'Analyst\Http\CurlHttpClient',
+		'Analyst\Http\DummyHttpClient',
+	];
+
+	/**
+	 * ApiRequestor constructor.
+	 * @param $id
+	 * @param $secret
+	 * @param $apiBase
+	 * @throws \Exception
+	 */
+	public function __construct($id, $secret, $apiBase)
+	{
+		$this->clientId = $id;
+		$this->clientSecret = $secret;
+
+		$this->setApiBase($apiBase);
+
+		$this->httpClient = $this->resolveHttpClient();
+	}
+
+	/**
+	 * Set api base url
+	 *
+	 * @param $url
+	 */
+	public function setApiBase($url)
+	{
+		$this->apiBase = $url;
+	}
+
+	/**
+	 * Get request
+	 *
+	 * @param $url
+	 * @param array $headers
+	 * @return mixed
+	 */
+	public function get($url, $headers = [])
+	{
+		return $this->request('GET', $url, null, $headers);
+	}
+
+	/**
+	 * Post request
+	 *
+	 * @param $url
+	 * @param $body
+	 * @param array $headers
+	 * @return mixed
+	 */
+	public function post($url, $body = [], $headers = [])
+	{
+		return $this->request('POST', $url, $body, $headers);
+	}
+
+	/**
+	 * Put request
+	 *
+	 * @param $url
+	 * @param $body
+	 * @param array $headers
+	 * @return mixed
+	 */
+	public function put($url, $body = [], $headers = [])
+	{
+		return $this->request('PUT', $url, $body, $headers);
+	}
+
+	/**
+	 * Delete request
+	 *
+	 * @param $url
+	 * @param array $headers
+	 * @return mixed
+	 */
+	public function delete($url, $headers = [])
+	{
+		return $this->request('DELETE', $url, null, $headers);
+	}
+
+	/**
+	 * Make request to api
+	 *
+	 * @param $method
+	 * @param $url
+	 * @param array $body
+	 * @param array $headers
+	 * @return mixed
+	 */
+	protected function request($method, $url, $body = [], $headers = [])
+	{
+		$fullUrl = $this->resolveFullUrl($url);
+
+		$date = date('r', time());
+
+		$headers['date'] = $date;
+		$headers['signature'] = $this->resolveSignature($this->clientSecret, $method, $fullUrl, $body, $date);
+
+		// Lowercase header names
+		$headers = $this->prepareHeaders(
+			array_merge($headers, $this->defaultHeaders)
+		);
+
+		$response = $this->httpClient->request($method, $fullUrl, $body, $headers);
+
+		// TODO: Check response code and take actions
+
+		return $response;
+	}
+
+	/**
+	 * Set one default header
+	 *
+	 * @param $header
+	 * @param $value
+	 */
+	public function setDefaultHeader($header, $value)
+	{
+		$this->defaultHeaders[
+			$this->resolveValidHeaderName($header)
+		] = $value;
+	}
+
+	/**
+	 * Resolves supported http client
+	 *
+	 * @return HttpClientContract
+	 * @throws Exception
+	 */
+	protected function resolveHttpClient()
+	{
+		$clients = array_filter($this->availableClients, $this->guessClientSupportEnvironment());
+
+		if (!isset($clients[0])) {
+			throw new Exception('There is no http client which this application can support');
+		}
+
+		// Instantiate first supported http client
+		return new $clients[0];
+	}
+
+	/**
+	 * This will filter out clients which is not supported
+	 * by the current environment
+	 *
+	 * @return \Closure
+	 */
+	protected function guessClientSupportEnvironment()
+	{
+		return function ($client) {
+			return forward_static_call([$client, 'hasSupport']);
+		};
+	}
+
+	/**
+	 * Resolves valid header name
+	 *
+	 * @param $headerName
+	 * @return string
+	 */
+	private function resolveValidHeaderName($headerName)
+	{
+		return strtolower($headerName);
+	}
+
+	/**
+	 * Lowercase header names
+	 *
+	 * @param $headers
+	 * @return array
+	 */
+	private function prepareHeaders($headers)
+	{
+		return array_change_key_case($headers, CASE_LOWER);
+	}
+
+	/**
+	 * Sign request
+	 *
+	 * @param $key
+	 * @param $method
+	 * @param $url
+	 * @param $body
+	 * @param $date
+	 *
+	 * @return false|string
+	 */
+	private function resolveSignature($key, $method, $url, $body, $date)
+	{
+		$string = implode('\n', [$method, $url, md5(json_encode($body)), $date]);
+
+		$contentSecret = hash_hmac('sha256', $string, $key);
+
+		return sprintf('%s:%s', $this->clientId, $contentSecret);
+	}
+
+	/**
+	 * Compose full url
+	 *
+	 * @param $url
+	 * @return string
+	 */
+	private function resolveFullUrl($url)
+	{
+		return sprintf('%s/%s', $this->apiBase, trim($url, '/'));
+	}
+}