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wepay.php
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Wed, Jan 1, 12:48

wepay.php
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<?php
class WePay {
/**
* Version number - sent in user agent string
*/
const VERSION = '0.1.3';
/**
* Scope fields
* Passed into Wepay::getAuthorizationUri as array
*/
const SCOPE_MANAGE_ACCOUNTS = 'manage_accounts'; // Open and interact with accounts
const SCOPE_VIEW_BALANCE = 'view_balance'; // View account balances
const SCOPE_COLLECT_PAYMENTS = 'collect_payments'; // Create and interact with checkouts
const SCOPE_VIEW_USER = 'view_user'; // Get details about authenticated user
const SCOPE_PREAPPROVE_PAYMENTS = 'preapprove_payments'; // Create and interact with preapprovals
const SCOPE_SEND_MONEY = 'send_money'; // For withdrawals
/**
* Application's client ID
*/
private static $client_id;
/**
* Application's client secret
*/
private static $client_secret;
/**
* @deprecated Use WePay::getAllScopes() instead.
*/
public static $all_scopes = array(
self::SCOPE_MANAGE_ACCOUNTS,
self::SCOPE_VIEW_BALANCE,
self::SCOPE_COLLECT_PAYMENTS,
self::SCOPE_PREAPPROVE_PAYMENTS,
self::SCOPE_VIEW_USER,
self::SCOPE_SEND_MONEY,
);
/**
* Determines whether to use WePay's staging or production servers
*/
private static $production = null;
/**
* cURL handle
*/
private static $ch = NULL;
/**
* Authenticated user's access token
*/
private $token;
/**
* Pass WePay::getAllScopes() into getAuthorizationUri if your application desires full access
*/
public static function getAllScopes() {
return array(
self::SCOPE_MANAGE_ACCOUNTS,
self::SCOPE_VIEW_BALANCE,
self::SCOPE_COLLECT_PAYMENTS,
self::SCOPE_PREAPPROVE_PAYMENTS,
self::SCOPE_VIEW_USER,
self::SCOPE_SEND_MONEY,
);
}
/**
* Generate URI used during oAuth authorization
* Redirect your user to this URI where they can grant your application
* permission to make API calls
* @link https://www.wepay.com/developer/reference/oauth2
* @param array $scope List of scope fields for which your application wants access
* @param string $redirect_uri Where user goes after logging in at WePay (domain must match application settings)
* @param array $options optional user_name,user_email which will be pre-filled on login form, state to be returned in querystring of redirect_uri
* @return string URI to which you must redirect your user to grant access to your application
*/
public static function getAuthorizationUri(array $scope, $redirect_uri, array $options = array()) {
// This does not use WePay::getDomain() because the user authentication
// domain is different than the API call domain
if (self::$production === null) {
throw new RuntimeException('You must initialize the WePay SDK with WePay::useStaging() or WePay::useProduction()');
}
$domain = self::$production ? 'https://www.wepay.com' : 'https://stage.wepay.com';
$uri = $domain . '/v2/oauth2/authorize?';
$uri .= http_build_query(array(
'client_id' => self::$client_id,
'redirect_uri' => $redirect_uri,
'scope' => implode(',', $scope),
'state' => empty($options['state']) ? '' : $options['state'],
'user_name' => empty($options['user_name']) ? '' : $options['user_name'],
'user_email' => empty($options['user_email']) ? '' : $options['user_email'],
), '', '&');
return $uri;
}
private static function getDomain() {
if (self::$production === true) {
return 'https://wepayapi.com/v2/';
}
elseif (self::$production === false) {
return 'https://stage.wepayapi.com/v2/';
}
else {
throw new RuntimeException('You must initialize the WePay SDK with WePay::useStaging() or WePay::useProduction()');
}
}
/**
* Exchange a temporary access code for a (semi-)permanent access token
* @param string $code 'code' field from query string passed to your redirect_uri page
* @param string $redirect_uri Where user went after logging in at WePay (must match value from getAuthorizationUri)
* @return StdClass|false
* user_id
* access_token
* token_type
*/
public static function getToken($code, $redirect_uri) {
$params = (array(
'client_id' => self::$client_id,
'client_secret' => self::$client_secret,
'redirect_uri' => $redirect_uri,
'code' => $code,
'state' => '', // do not hardcode
));
$result = self::make_request('oauth2/token', $params);
return $result;
}
/**
* Configure SDK to run against WePay's production servers
* @param string $client_id Your application's client id
* @param string $client_secret Your application's client secret
* @return void
* @throws RuntimeException
*/
public static function useProduction($client_id, $client_secret) {
if (self::$production !== null) {
throw new RuntimeException('API mode has already been set.');
}
self::$production = true;
self::$client_id = $client_id;
self::$client_secret = $client_secret;
}
/**
* Configure SDK to run against WePay's staging servers
* @param string $client_id Your application's client id
* @param string $client_secret Your application's client secret
* @return void
* @throws RuntimeException
*/
public static function useStaging($client_id, $client_secret) {
if (self::$production !== null) {
throw new RuntimeException('API mode has already been set.');
}
self::$production = false;
self::$client_id = $client_id;
self::$client_secret = $client_secret;
}
/**
* Create a new API session
* @param string $token - access_token returned from WePay::getToken
*/
public function __construct($token) {
if ($token && !is_string($token)) {
throw new InvalidArgumentException('$token must be a string, ' . gettype($token) . ' provided');
}
$this->token = $token;
}
/**
* Clean up cURL handle
*/
public function __destruct() {
if (self::$ch) {
curl_close(self::$ch);
self::$ch = NULL;
}
}
/**
* create the cURL request and execute it
*/
private static function make_request($endpoint, $values, $headers = array())
{
self::$ch = curl_init();
$headers = array_merge(array("Content-Type: application/json"), $headers); // always pass the correct Content-Type header
curl_setopt(self::$ch, CURLOPT_USERAGENT, 'WePay v2 PHP SDK v' . self::VERSION);
curl_setopt(self::$ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt(self::$ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt(self::$ch, CURLOPT_TIMEOUT, 30); // 30-second timeout, adjust to taste
curl_setopt(self::$ch, CURLOPT_POST, !empty($values)); // WePay's API is not strictly RESTful, so all requests are sent as POST unless there are no request values
$uri = self::getDomain() . $endpoint;
curl_setopt(self::$ch, CURLOPT_URL, $uri);
if (!empty($values)) {
curl_setopt(self::$ch, CURLOPT_POSTFIELDS, json_encode($values));
}
$raw = curl_exec(self::$ch);
if ($errno = curl_errno(self::$ch)) {
// Set up special handling for request timeouts
if ($errno == CURLE_OPERATION_TIMEOUTED) {
throw new WePayServerException("Timeout occurred while trying to connect to WePay");
}
throw new Exception('cURL error while making API call to WePay: ' . curl_error(self::$ch), $errno);
}
$result = json_decode($raw);
$error_code = null;
if (isset($result->error_code)) {
$error_code = $result->error_code;
}
$httpCode = curl_getinfo(self::$ch, CURLINFO_HTTP_CODE);
if ($httpCode >= 400) {
if ($httpCode >= 500) {
throw new WePayServerException($result->error_description, $httpCode, $result, $error_code);
}
switch ($result->error) {
case 'invalid_request':
throw new WePayRequestException($result->error_description, $httpCode, $result, $error_code);
case 'access_denied':
default:
throw new WePayPermissionException($result->error_description, $httpCode, $result, $error_code);
}
}
return $result;
}
/**
* Make API calls against authenticated user
* @param string $endpoint - API call to make (ex. 'user', 'account/find')
* @param array $values - Associative array of values to send in API call
* @return StdClass
* @throws WePayException on failure
* @throws Exception on catastrophic failure (non-WePay-specific cURL errors)
*/
public function request($endpoint, array $values = array()) {
$headers = array();
if ($this->token) { // if we have an access_token, add it to the Authorization header
$headers[] = "Authorization: Bearer $this->token";
}
$result = self::make_request($endpoint, $values, $headers);
return $result;
}
}
/**
* Different problems will have different exception types so you can
* catch and handle them differently.
*
* WePayServerException indicates some sort of 500-level error code and
* was unavoidable from your perspective. You may need to re-run the
* call, or check whether it was received (use a "find" call with your
* reference_id and make a decision based on the response)
*
* WePayRequestException indicates a development error - invalid endpoint,
* erroneous parameter, etc.
*
* WePayPermissionException indicates your authorization token has expired,
* was revoked, or is lacking in scope for the call you made
*/
class WePayException extends Exception {
public function __construct($description = '', $http_code = FALSE, $response = FALSE, $code = 0, $previous = NULL)
{
$this->response = $response;
if (!defined('PHP_VERSION_ID')) {
$version = explode('.', PHP_VERSION);
define('PHP_VERSION_ID', ($version[0] * 10000 + $version[1] * 100 + $version[2]));
}
if (PHP_VERSION_ID < 50300) {
parent::__construct($description, $code);
} else {
parent::__construct($description, $code, $previous);
}
}
}
class WePayRequestException extends WePayException {}
class WePayPermissionException extends WePayException {}
class WePayServerException extends WePayException {}

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