Add first Requests HTTP client implementation

lib/EchoNest/HttpClient/Requests.php

@@ -0,0 +1,75 @@
+<?php
+
+/**
+ * Performs requests on EchoNest API. API documentation should be self-explanatory.
+ *
+ * @author    Brent Shaffer <bshafs at gmail dot com>
+ * @license   MIT License
+ */
+class EchoNest_HttpClient_Requests extends EchoNest_HttpClient
+{
+    /**
+    * Send a request to the server, receive a response
+    *
+    * @param  string   $apiPath       Request API path
+    * @param  array    $parameters    Parameters
+    * @param  string   $httpMethod    HTTP method to use
+    *
+    * @return string   HTTP response
+    */
+    protected function doRequest($url, array $parameters = array(), $httpMethod = 'GET', array $options = array())
+    {
+        if($this->options['api_key'])
+        {
+          $parameters = array_merge(array(
+              'format'  => $this->options['format'],
+              'api_key' => $this->options['api_key']
+          ), $parameters);
+        }
+
+        $headers = array();
+        $headers['User-Agent'] = $this->options['user_agent'];
+
+        if ('GET' === $httpMethod && !empty($parameters)) {
+            $queryString = utf8_encode($this->buildQuery($parameters));
+            $url .= '?' . $queryString;
+
+            $this->debug('send ' . $httpMethod . ' request: ' . $url);
+            $request = Requests::get($url, $headers);
+        } 
+        else {
+            $this->debug('send ' . $httpMethod . ' request: ' . $url);
+            $request = Requests::post($url, $headers, $parameters);
+        }
+
+        return $request->body;
+    }
+
+    protected function buildQuery($parameters)
+    {
+        $append = '';
+        foreach ($parameters as $key => $value) 
+        {
+            // multiple parameter passed
+            if (is_array($value)) {
+                foreach ($value as $val) {
+                    $append.=sprintf('&%s=%s', $key, $val);
+                }
+                unset($parameters[$key]);
+            }
+            elseif (is_bool($value)) {
+                $parameters[$key] = $value ? 'true' : 'false';
+            }
+        }
+
+        return http_build_query($parameters, '', '&') . $append;
+    }
+
+    protected function debug($message)
+    {
+        if($this->options['debug'])
+        {
+            print $message."\n";
+        }
+    }
+}