Emailage.class.php

<?php
	/**
	 * Create for Emailage to provide SDK access to their API through PHP
	 * @author jpitcher
	 *
	 */
	class Emailage
	{
		/**
		 * The allowed Format Values.
		 * 
		 * This Array is used to Verify that if a format is changed, that the changed value is valid to Emailage.
		 * @var ARRAY
		 */
			private $allowed_formats = Array('json', 'xml');
			
		/**
		 * The Allowed Signature Methods.
		 * 
		 * This Array is used to Verify that if a Signature Method is changed, that the changed value is valid to Emailage.
		 * @var ARRAY
		 */
			private $allowed_signature_methods = Array('sha1', 'sha256', 'sha384', 'sha512');
			
		/**
		 * The prefix to the URL.
		 * @var STRING
		 */
			private $URL_prefix = 'https://';
			
		/**
		 * The String appended to the URL if Sandbox == TRUE
		 * @var STRING
		 */
			private $URL_sandbox = 'sandbox';
			
		/**
		 * The String appended to the URL if Sandbox == FALSE
		 * @var STRING
		 */
			private $URL_live = 'api';
			
		/**
		 * The Apex of the domain name, used for building the full URL
		 * @var STRING
		 */
			private $URL_apex = 'emailage.com/';
			
		/**
		 * The Method Base that we attach to every full URL
		 * @var STRING
		 */
			private $URL_method_base = 'EmailAgeValidator/';
			
		/**
		 * What we append to the URL if setting_flag == TRUE
		 * @var STRING
		 */
			private $URL_method_flag = 'flag/';
		
		/**
		 * The Current Setting of Format
		 * @var STRING
		 */
			private $setting_format = 'json';
			
		/**
		 * The Current Setting for Signature Method
		 * @var STRING
		 */
			private $setting_signature_method = 'sha1';
			
		/**
		 * The Current Setting for if the SDK should connect to the sandbox or not.
		 * @var BOOLEAN
		 */
			private $setting_sandbox = TRUE;
		/**
		 * The Current Setting for if the Full URL should include the flag component
		 * @var BOOLEAN
		 */
			private $setting_flag = FALSE;
			
		/**
		 * The Account SID provided to you from Emailage.
		 * @var STRING
		 */
			private $setting_account_sid;
			
		/**
		 * The Auth Token provided to you from Emailage.
		 * @var STRING
		 */
			private $setting_auth_token;
			
		/**
		 * The Current Setting for if the SDK should Validate the Response returned from Emailage
		 * @var BOOLEAN
		 */
			private $setting_validate_response = TRUE;
			
		/**
		 * The Current Setting for if the SDK should return the Emailage Response as a Parsed Object, or just as a String and allow you to deal with parsing the object
		 * @var BOOLEAN
		 */
			private $setting_return_parsed_result = TRUE;
		/**
		 * The Request Type of the API Call.  Currently locked at GET.
		 * @var STRING
		 */
			private $request_type = 'GET';
			
		
		/**
		 * The Additional Parameters that the user can provide to the Query Calls
		 * @var unknown
		 */
			private $allowed_parameters = Array
			(
				'firstname',
				'lastname',
				'billaddress',
				'billcity',
				'billregion',
				'billpostal',
				'billcountry',
				'shipaddress',
				'shipcity',
				'shipregion',
				'shippostal',
				'shipcountry',
				'phone',
				'transamount',
				'transcurrency',
				'user_email',
				'transorigin',
				'existingcustomer',
				'useragent',
				'acceptlang',
				'response_language',
				'urid',
				'customerid',
				'deviceid',
				'deviceSource',
				'time_to_service',
				'service_date',
				'secondary_email',
				'service_location',
				'service_detail',
				'service_category',
				'delivery_type',
				'cardFirstSix',
				'hashedCardNumber',
				'custom1',
				'custom2'
			);
		
			
		/**
		 * Class Constructor, Sets up the Account SID and Auth Token, and any other settings if you provide them.
		 * 
		 * @param STRING $account_sid
		 * @param STRING $auth_token
		 * @param BOOLEAN $sandbox
		 * @param STRING $format
		 * @param STRING $signature_method
		 * @param BOOLEAN $validate_response
		 * @param BOOLEAN $return_parsed_result
		 */
			public function __construct($account_sid, $auth_token, $sandbox = TRUE, $format = 'json', $signature_method = 'sha1', $validate_response = TRUE, $return_parsed_result = TRUE)
			{
				$this->changeSetting('account_sid', $account_sid);
				$this->changeSetting('auth_token', $auth_token);
				$this->changeSetting('sandbox', $sandbox);
				$this->changeSetting('format', $format);
				$this->changeSetting('signature_method', $signature_method);
				$this->changeSetting('validate_response', $validate_response);
				$this->changeSetting('return_parsed_result', $return_parsed_result);
			}
		
		/**
		 * Call if you want to Flag an Email as Fraud.
		 * @param STRING $email
		 * @param INTEGER $fraudID
		 * @return mixed
		 */
			public function FlagEmailAsFraud($email, $fraudID)
			{
				return $this->executeQuery($email, NULL, 'fraud', $fraudID);
			}
		
		/**
		 * Call if you want to Flag an Email as Good.
		 * @param STRING $email
		 * @return mixed
		 */
			public function FlagEmailAsGood($email)
			{
				return $this->executeQuery($email, NULL, 'good');
			}
			
		/**
		 * Call if you want to Flag an Email as Neutral.
		 * @param STRING $email
		 * @return mixed
		 */
			public function RemoveFlagFromEmail($email)
			{
				return $this->executeQuery($email, NULL, 'neutral');
			}
		
		/**
		 * Validate an Email Address
		 * @param STRING $email
		 * @param STRING $recordID
		 * @return mixed
		 */
			public function QueryEmail($email, Array $parameters = Array())
			{
				$acceptedParameters = $this->validateParametersArray($parameters);
				return $this->executeQuery($email, $acceptedParameters);
			}
		
		/**
		 * Validate an IP Address
		 * @param STRING $ip
		 * @param STRING $recordID
		 * @return mixed
		 */
			public function QueryIpAddress($ip, Array $parameters = Array())
			{
				$acceptedParameters = $this->validateParametersArray($parameters);
				return $this->executeQuery($ip, $acceptedParameters);
			}
		
		/**
		 * Validates both an Email Address and an IP Address
		 * @param STRING $email
		 * @param STRING $ip
		 * @param string $recordID
		 * @return mixed
		 */
			public function QueryEmailAndIpAddress($email, $ip, Array $parameters = Array())
			{
				$acceptedParameters = $this->validateParametersArray($parameters);
				return $this->executeQuery($email . '+' . $ip, $acceptedParameters);
			}
		
		/**
		 * Validates all the Parameters the users has provided.
		 * 
		 * If they are not valid Parameters it throws an error.
		 * @param unknown $parameters
		 */
			private function validateParametersArray($parameters)
			{
				$validParameters = Array();
				
				foreach($parameters AS $paramName => $param)
				{
					$paramName = strtolower($paramName);
					if(in_array($paramName, $this->allowed_parameters))
					{
						$validParameters[$paramName] = $param;
					}
					else 
					{
						$this->handleError('9000', "Invalid Paramater Provided: ($paramName)");
					}
				}
				return $validParameters;
			}
			
		/**
		 * Creates the Parameters Array for Curl to Execute the Query
		 * @param string $query
		 * @param string $recordID
		 * @param string $flag
		 * @param string $fraudID
		 * @return SimpleXMLElement|unknown
		 */
			private function executeQuery($query, $additionalParameters = NULL, $flag = NULL, $fraudID = NULL)
			{
				/**
				 * Do we need to Add or Remove the Flag from the Full URL ??
				 */
					if(!is_null($flag))
					{
						$this->setting_flag = TRUE;
					}
					else
					{
						$this->setting_flag = FALSE;
					}
					
				// Get the Full URL
				$URL = $this->getURL();
				
				/**
				 * Create an Array of Parameters
				 */
					$parameters = Array();
					$parameters['format'] = $this->setting_format;
					$parameters['oauth_consumer_key'] = $this->setting_account_sid;
					$parameters['oauth_nonce'] = uniqid();
					$parameters['oauth_signature_method'] = 'HMAC-' . strtoupper($this->setting_signature_method);
					$parameters['oauth_timestamp'] = time();
					$parameters['oauth_version'] = '1.0';
				/**
				 * Lets Generate our Signature based on the Parameters we already have setup.
				 */
					$parameters['oauth_signature'] = $this->generateSig($parameters, $URL);
					
				/**
				 * Lets add the rest of our Parameters.
				 * 
				 * You might be saying... Those are going to get sent through to Emailage, 
				 * but they will only get parsed through if their value is NOT NULL
				 */
					$parameters['query'] = $query;
					$parameters['flag'] = $flag;
					$parameters['fraudcodeID'] = $fraudID;
				
				/**
				 * Lets Add in our Additional Parameters
				 */
					if(!is_null($additionalParameters))
					{
						$parameters = array_merge($parameters, $additionalParameters);
					}
					
				// Have Curl Execute the Call and Return the Results
				$results = $this->execute($URL, $parameters);
				
				// Does the SDK need to Validate the Response?  If so, let's do it.
				if($this->setting_validate_response)
				{
					$this->validateResponse($results);
				}
				
				// Should we return the Results As Parsed or just as a String?
				if($this->setting_return_parsed_result)
				{
					return $this->returnParsedResults($results);
				}
				else
				{
					return $results;
				}
			}
		
		/**
		 * Validates the Response, and if an Error has occured throws the error and error message.
		 * @param Exception $response
		 */
			private function validateResponse($response)
			{
				$errorNum = NULL;
				$errorMessage = NULL;
				
				$parsed_results = $this->returnParsedResults($response);
				
				if($parsed_results->responseStatus->status == 'failed')
				{
					$errorNum = (int)$parsed_results->responseStatus->errorCode;
					$errorMessage = (string)$parsed_results->responseStatus->description;
					$this->handleError($errorNum, $errorMessage);
				}
			}
		
		/**
		 * Parses the Results and Returns the parsed results.
		 * @param string $response
		 * @return mixed
		 */
			private function returnParsedResults($response)
			{
				if(strtolower($this->setting_format) == 'json')
				{
					$parsed_results = $this->parseJSON($response);
				}
				else
				{
					$parsed_results = $this->parseXML($response);
				}
				return $parsed_results;
			}
		
		/**
		 * Parse's and returns the results as XML
		 * @param string $response
		 * @return SimpleXMLElement
		 */
			private function parseXML($response)
			{
				return simplexml_load_string($response);
			}
		
		/**
		 * Parse's and returns the results as JSON object
		 * @param string $response
		 * @return mixed
		 */
			private function parseJSON($response)
			{
				$json_result = json_decode($response);
				
				// Lets check and see if JSON had an issue Decoding...
				$error = json_last_error();
					
				if($error != JSON_ERROR_NONE) // Looks like they did.  Let's throw an error based on the Error JSON had.
				{
					switch ($error) {
						case JSON_ERROR_DEPTH:
							$errorNum = 8200;
							$errorMessage = 'JSON Error Occured. - Maximum stack depth exceeded';
							break;
						case JSON_ERROR_STATE_MISMATCH:
							$errorNum = 8201;
							$errorMessage = 'JSON Error Occured. - Underflow or the modes mismatch';
							break;
						case JSON_ERROR_CTRL_CHAR:
							$errorNum = 8202;
							$errorMessage = 'JSON Error Occured. - Unexpected control character found';
							break;
						case JSON_ERROR_SYNTAX:
							$errorNum = 8203;
							$errorMessage = 'JSON Error Occured. - Syntax error, malformed JSON';
							break;
						case JSON_ERROR_UTF8:
							$errorNum = 8204;
							$errorMessage = 'JSON Error Occured. - Malformed UTF-8 characters, possibly incorrectly encoded';
							break;
						default:
							$errorNum = 8205;
							$errorMessage = 'JSON Error Occured. - Unknown error';
							break;
					}
					$this->handleError($errorNum, $errorMessage);
				}
				return $json_result;
			}
		
		/**
		 * Executes the CURL call and returns the results.
		 * @param string $URL
		 * @param array $parameters
		 * @return mixed
		 */
			private function execute($URL, $parameters)
			{
				// Attach our Query Parameters to the URL
				$URL .= '?' . http_build_query($parameters);
				
				$CH = curl_init($URL); // Initialize Curl
					
				curl_setopt($CH, CURLOPT_RETURNTRANSFER, 1); // Force Curl to return the response
	
				$results = curl_exec($CH); // Do the Curl Call
				
				/**
				 * Lets make sure we had no Curl Error's, if we do, let's throw an exception.
				 */
					if($errno = curl_errno($CH)) {
						$error_message = curl_strerror($errno);
						$this->handleError($errno, $error_message);
					}
				return str_replace("\xEF\xBB\xBF", '', $results); //String Replace is clearing up some characters being sent from Emailage that json_decode doesn't like.
			}
		
		/**
		 * Creates and returns the Signature for EMAILAGE
		 * @param array $parameters
		 * @param string $URL
		 * @return string
		 */
			private function generateSig($parameters, $URL)
			{
				$hash_Params = Array();
				$hash_Params[] = strtoupper($this->request_type); // ATM this is just GET
				$hash_Params[] = urlencode($URL); // THE URL we are going to send the call to minus anything upto and after the ?
				$hash_Params[] = urlencode(http_build_query($parameters)); // The Parameters we need to create the Hash.
				
				// Make and return the Hash.
				return base64_encode(hash_hmac(strtolower($this->setting_signature_method), join('&', $hash_Params), $this->setting_auth_token . '&', TRUE));
			}
		
		/**
		 * Allow users to Change their Settings
		 * 
		 * Throws errors if errors are found.
		 * @param string $name
		 * @param value $value
		 */
			public function changeSetting($name, $value)
			{
				switch(strtolower($name))
				{
					case 'account_sid':
					case 'auth_token':
						// No Validation Needed ...
					break;
					
					case 'format':
						if(!in_array($value, $this->allowed_formats))
						{
							$this->handleError('8000', "Unable to Change Format.  Format is invalid. ($value)");
						}
					break;
					
					case 'return_parsed_result':
						if(!is_bool($value))
						{
							$this->handleError('8005', "Unable to Return Parsed Results.  Value was not True or False");
						}
					break;
					
					case 'sandbox':
						if(!is_bool($value))
						{
							$this->handleError('8001', "Unable to Change Sandbox.  Value was not True or False");
						}
					break;
					
					case 'signature_method':
						if(!in_array(strtolower($value), $this->allowed_signature_methods))
						{
							$this->handleError('8003', "Unable to Change Signature Method.  Signature Method is invalid. ($value)");
						}
					break;
					
					case 'validate_response':
						if(!is_bool($value))
						{
							$this->handleError('8004', "Unable to Change Validate Response.  Value was not True or False");
						}
					break;
					
					default:
						$this->handleError('8100', "Unable to change ($name).  Unknown Setting. ($value)");
					break;
				}
				
				$this->saveSetting($name, $value);
			}
		
		/**
		 * Single function for handling errors if we want to change the process in the future.
		 * @param int $errorNum
		 * @param string $errorMessage
		 * @throws Exception
		 */
			private function handleError($errorNum, $errorMessage)
			{
				throw new Exception($errorMessage, $errorNum);
			}
		
		/**
		 * Does the Actual Saving of the Setting to the class
		 * @param string $name
		 * @param string $value
		 */
			private function saveSetting($name, $value)
			{
				$settingName = 'setting_' . $name;
				$this->$settingName = $value;
			}
		
		/**
		 * Creates the the URL that we will send the call to.
		 * @return string
		 */
			private function getURL()
			{
				$URL = $this->URL_prefix;
				
				// Are we going to the sandbox or the live site?
				if($this->setting_sandbox)
				{
					$URL .= $this->URL_sandbox;
				}
				else
				{
					$URL .= $this->URL_live;
				}
				
				// Lets add on the Apex and the method base
				$URL .= '.' . $this->URL_apex . $this->URL_method_base;
				
				// Do we need to append the flag method to the url?
				if($this->setting_flag)
				{
					$URL .= $this->URL_method_flag;
				}
				
				return $URL;
			}
	}