<?php
/**
 * Easily interact with the Authorize.Net AIM API.
 *
 * Example Authorize and Capture Transaction against the Sandbox:
 * <code>
 * <?php require_once 'AuthorizeNet.php'
 * $sale = new AuthorizeNetAIM;
 * $sale->setFields(
 *     array(
 *    'amount' => '4.99',
 *    'card_num' => '411111111111111',
 *    'exp_date' => '0515'
 *    )
 * );
 * $response = $sale->authorizeAndCapture();
 * if ($response->approved) {
 *     echo "Sale successful!"; } else {
 *     echo $response->error_message;
 * }
 * ?>
 * </code>
 *
 * Note: To send requests to the live gateway, either define this:
 * define("AUTHORIZENET_SANDBOX", false);
 *   -- OR -- 
 * $sale = new AuthorizeNetAIM;
 * $sale->setSandbox(false);
 *
 * @package    AuthorizeNet
 * @subpackage AuthorizeNetAIM
 * @link       https://www.authorize.net/support/AIM_guide.pdf AIM Guide
 */

 
/**
 * Builds and sends an AuthorizeNet AIM Request.
 *
 * @package    AuthorizeNet
 * @subpackage AuthorizeNetAIM
 */
class AuthorizeNetAIM extends AuthorizeNetRequest
{

    const LIVE_URL = 'https://secure.authorize.net/gateway/transact.dll';
    const SANDBOX_URL = 'https://test.authorize.net/gateway/transact.dll';
    
    /**
     * Holds all the x_* name/values that will be posted in the request. 
     * Default values are provided for best practice fields.
     */
    protected $_x_post_fields = array(
        "version" => "3.1", 
        "delim_char" => ",",
        "delim_data" => "TRUE",
        "relay_response" => "FALSE",
        "encap_char" => "|",
        );
        
    /**
     * Only used if merchant wants to send multiple line items about the charge.
     */
    private $_additional_line_items = array();
    
    /**
     * Only used if merchant wants to send custom fields.
     */
    private $_custom_fields = array();
    
    /**
     * Checks to make sure a field is actually in the API before setting.
     * Set to false to skip this check.
     */
    public $verify_x_fields = true;
    
    /**
     * A list of all fields in the AIM API.
     * Used to warn user if they try to set a field not offered in the API.
     */
    private $_all_aim_fields = array("address","allow_partial_auth","amount",
        "auth_code","authentication_indicator", "bank_aba_code","bank_acct_name",
        "bank_acct_num","bank_acct_type","bank_check_number","bank_name",
        "card_code","card_num","cardholder_authentication_value","city","company",
        "country","cust_id","customer_ip","delim_char","delim_data","description",
        "duplicate_window","duty","echeck_type","email","email_customer",
        "encap_char","exp_date","fax","first_name","footer_email_receipt",
        "freight","header_email_receipt","invoice_num","last_name","line_item",
        "login","method","phone","po_num","recurring_billing","relay_response",
        "ship_to_address","ship_to_city","ship_to_company","ship_to_country",
        "ship_to_first_name","ship_to_last_name","ship_to_state","ship_to_zip",
        "split_tender_id","state","tax","tax_exempt","test_request","tran_key",
        "trans_id","type","version","zip"
        );
    
    /**
     * Do an AUTH_CAPTURE transaction. 
     * 
     * Required "x_" fields: card_num, exp_date, amount
     *
     * @param string $amount   The dollar amount to charge
     * @param string $card_num The credit card number
     * @param string $exp_date CC expiration date
     *
     * @return AuthorizeNetAIM_Response
     */
    public function authorizeAndCapture($amount = false, $card_num = false, $exp_date = false)
    {
        ($amount ? $this->amount = $amount : null);
        ($card_num ? $this->card_num = $card_num : null);
        ($exp_date ? $this->exp_date = $exp_date : null);
        $this->type = "AUTH_CAPTURE";
        return $this->_sendRequest();
    }
    
    /**
     * Do a PRIOR_AUTH_CAPTURE transaction.
     *
     * Required "x_" field: trans_id(The transaction id of the prior auth, unless split
     * tender, then set x_split_tender_id manually.)
     * amount (only if lesser than original auth)
     *
     * @param string $trans_id Transaction id to charge
     * @param string $amount   Dollar amount to charge if lesser than auth
     *
     * @return AuthorizeNetAIM_Response
     */
    public function priorAuthCapture($trans_id = false, $amount = false)
    {
        ($trans_id ? $this->trans_id = $trans_id : null);
        ($amount ? $this->amount = $amount : null);
        $this->type = "PRIOR_AUTH_CAPTURE";
        return $this->_sendRequest();
    }

    /**
     * Do an AUTH_ONLY transaction.
     *
     * Required "x_" fields: card_num, exp_date, amount
     *
     * @param string $amount   The dollar amount to charge
     * @param string $card_num The credit card number
     * @param string $exp_date CC expiration date
     *
     * @return AuthorizeNetAIM_Response
     */
    public function authorizeOnly($amount = false, $card_num = false, $exp_date = false)
    {
        ($amount ? $this->amount = $amount : null);
        ($card_num ? $this->card_num = $card_num : null);
        ($exp_date ? $this->exp_date = $exp_date : null);
        $this->type = "AUTH_ONLY";
        return $this->_sendRequest();
    }

    /**
     * Do a VOID transaction.
     *
     * Required "x_" field: trans_id(The transaction id of the prior auth, unless split
     * tender, then set x_split_tender_id manually.)
     *
     * @param string $trans_id Transaction id to void
     *
     * @return AuthorizeNetAIM_Response
     */
    public function void($trans_id = false)
    {
        ($trans_id ? $this->trans_id = $trans_id : null);
        $this->type = "VOID";
        return $this->_sendRequest();
    }
    
    /**
     * Do a CAPTURE_ONLY transaction.
     *
     * Required "x_" fields: auth_code, amount, card_num , exp_date
     *
     * @param string $auth_code The auth code
     * @param string $amount    The dollar amount to charge
     * @param string $card_num  The last 4 of credit card number
     * @param string $exp_date  CC expiration date
     *
     * @return AuthorizeNetAIM_Response
     */
    public function captureOnly($auth_code = false, $amount = false, $card_num = false, $exp_date = false)
    {
        ($auth_code ? $this->auth_code = $auth_code : null);
        ($amount ? $this->amount = $amount : null);
        ($card_num ? $this->card_num = $card_num : null);
        ($exp_date ? $this->exp_date = $exp_date : null);
        $this->type = "CAPTURE_ONLY";
        return $this->_sendRequest();
    }
    
    /**
     * Do a CREDIT transaction.
     *
     * Required "x_" fields: trans_id, amount, card_num (just the last 4)
     *
     * @param string $trans_id Transaction id to credit
     * @param string $amount   The dollar amount to credit
     * @param string $card_num The last 4 of credit card number
     *
     * @return AuthorizeNetAIM_Response
     */
    public function credit($trans_id = false, $amount = false, $card_num = false)
    {
        ($trans_id ? $this->trans_id = $trans_id : null);
        ($amount ? $this->amount = $amount : null);
        ($card_num ? $this->card_num = $card_num : null);
        $this->type = "CREDIT";
        return $this->_sendRequest();
    }
    
    /**
     * Alternative syntax for setting x_ fields.
     *
     * Usage: $sale->method = "echeck";
     *
     * @param string $name
     * @param string $value
     */
    public function __set($name, $value) 
    {
        $this->setField($name, $value);
    }
    
    /**
     * Quickly set multiple fields.
     *
     * Note: The prefix x_ will be added to all fields. If you want to set a
     * custom field without the x_ prefix, use setCustomField or setCustomFields.
     *
     * @param array $fields Takes an array or object.
     */
    public function setFields($fields)
    {
        $array = (array)$fields;
        foreach ($array as $key => $value) {
            $this->setField($key, $value);
        }
    }
    
    /**
     * Quickly set multiple custom fields.
     *
     * @param array $fields
     */
    public function setCustomFields($fields)
    {
        $array = (array)$fields;
        foreach ($array as $key => $value) {
            $this->setCustomField($key, $value);
        }
    }
    
    /**
     * Add a line item.
     * 
     * @param string $item_id
     * @param string $item_name
     * @param string $item_description
     * @param string $item_quantity
     * @param string $item_unit_price
     * @param string $item_taxable
     */
    public function addLineItem($item_id, $item_name, $item_description, $item_quantity, $item_unit_price, $item_taxable)
    {
        $line_item = "";
        $delimiter = "";
        foreach (func_get_args() as $key => $value) {
            $line_item .= $delimiter . $value;
            $delimiter = "<|>";
        }
        $this->_additional_line_items[] = $line_item;
    }
    
    /**
     * Use ECHECK as payment type.
     */
    public function setECheck($bank_aba_code, $bank_acct_num, $bank_acct_type, $bank_name, $bank_acct_name, $echeck_type = 'WEB')
    {
        $this->setFields(
            array(
            'method' => 'echeck',
            'bank_aba_code' => $bank_aba_code,
            'bank_acct_num' => $bank_acct_num,
            'bank_acct_type' => $bank_acct_type,
            'bank_name' => $bank_name,
            'bank_acct_name' => $bank_acct_type,
            'echeck_type' => $echeck_type,
            )
        );
    }
    
    /**
     * Set an individual name/value pair. This will append x_ to the name
     * before posting.
     *
     * @param string $name
     * @param string $value
     */
    public function setField($name, $value)
    {
        if ($this->verify_x_fields) {
            if (in_array($name, $this->_all_aim_fields)) {
                $this->_x_post_fields[$name] = $value;
            } else {
                throw new AuthorizeNetException("Error: no field $name exists in the AIM API.
                To set a custom field use setCustomField('field','value') instead.");
            }
        } else {
            $this->_x_post_fields[$name] = $value;
        }
    }
    
    /**
     * Set a custom field. Note: the x_ prefix will not be added to
     * your custom field if you use this method.
     *
     * @param string $name
     * @param string $value
     */
    public function setCustomField($name, $value)
    {
        $this->_custom_fields[$name] = $value;
    }
    
    /**
     * Unset an x_ field.
     *
     * @param string $name Field to unset.
     */
    public function unsetField($name)
    {
        unset($this->_x_post_fields[$name]);
    }
    
    /**
     *
     *
     * @param string $response
     * 
     * @return AuthorizeNetAIM_Response
     */
    protected function _handleResponse($response)
    {
        return new AuthorizeNetAIM_Response($response, $this->_x_post_fields['delim_char'], $this->_x_post_fields['encap_char'], $this->_custom_fields);
    }
    
    /**
     * @return string
     */
    protected function _getPostUrl()
    {
        return ($this->_sandbox ? self::SANDBOX_URL : self::LIVE_URL);
    }
    
    /**
     * Converts the x_post_fields array into a string suitable for posting.
     */
    protected function _setPostString()
    {
        $this->_x_post_fields['login'] = $this->_api_login;
        $this->_x_post_fields['tran_key'] = $this->_transaction_key;
        $this->_post_string = "";
        foreach ($this->_x_post_fields as $key => $value) {
            $this->_post_string .= "x_$key=" . urlencode($value) . "&";
        }
        // Add line items
        foreach ($this->_additional_line_items as $key => $value) {
            $this->_post_string .= "x_line_item=" . urlencode($value) . "&";
        }
        // Add custom fields
        foreach ($this->_custom_fields as $key => $value) {
            $this->_post_string .= "$key=" . urlencode($value) . "&";
        }
        $this->_post_string = rtrim($this->_post_string, "& ");
    }
}

/**
 * Parses an AuthorizeNet AIM Response.
 *
 * @package    AuthorizeNet
 * @subpackage AuthorizeNetAIM
 */
class AuthorizeNetAIM_Response extends AuthorizeNetResponse
{
    private $_response_array = array(); // An array with the split response.

    /**
     * Constructor. Parses the AuthorizeNet response string.
     *
     * @param string $response      The response from the AuthNet server.
     * @param string $delimiter     The delimiter used (default is ",")
     * @param string $encap_char    The encap_char used (default is "|")
     * @param array  $custom_fields Any custom fields set in the request.
     */
    public function __construct($response, $delimiter, $encap_char, $custom_fields)
    {
        if ($response) {
            
            // Split Array
            $this->response = $response;
            if ($encap_char) {
                $this->_response_array = explode($encap_char.$delimiter.$encap_char, substr($response, 1, -1));
            } else {
                $this->_response_array = explode($delimiter, $response);
            }
            
            /**
             * If AuthorizeNet doesn't return a delimited response.
             */
            if (count($this->_response_array) < 10) {
                $this->approved = false;
                $this->error = true;
                $this->error_message = "Unrecognized response from AuthorizeNet: $response";
                return;
            }
            
            
            
            // Set all fields
            $this->response_code        = $this->_response_array[0];
            $this->response_subcode     = $this->_response_array[1];
            $this->response_reason_code = $this->_response_array[2];
            $this->response_reason_text = $this->_response_array[3];
            $this->authorization_code   = $this->_response_array[4];
            $this->avs_response         = $this->_response_array[5];
            $this->transaction_id       = $this->_response_array[6];
            $this->invoice_number       = $this->_response_array[7];
            $this->description          = $this->_response_array[8];
            $this->amount               = $this->_response_array[9];
            $this->method               = $this->_response_array[10];
            $this->transaction_type     = $this->_response_array[11];
            $this->customer_id          = $this->_response_array[12];
            $this->first_name           = $this->_response_array[13];
            $this->last_name            = $this->_response_array[14];
            $this->company              = $this->_response_array[15];
            $this->address              = $this->_response_array[16];
            $this->city                 = $this->_response_array[17];
            $this->state                = $this->_response_array[18];
            $this->zip_code             = $this->_response_array[19];
            $this->country              = $this->_response_array[20];
            $this->phone                = $this->_response_array[21];
            $this->fax                  = $this->_response_array[22];
            $this->email_address        = $this->_response_array[23];
            $this->ship_to_first_name   = $this->_response_array[24];
            $this->ship_to_last_name    = $this->_response_array[25];
            $this->ship_to_company      = $this->_response_array[26];
            $this->ship_to_address      = $this->_response_array[27];
            $this->ship_to_city         = $this->_response_array[28];
            $this->ship_to_state        = $this->_response_array[29];
            $this->ship_to_zip_code     = $this->_response_array[30];
            $this->ship_to_country      = $this->_response_array[31];
            $this->tax                  = $this->_response_array[32];
            $this->duty                 = $this->_response_array[33];
            $this->freight              = $this->_response_array[34];
            $this->tax_exempt           = $this->_response_array[35];
            $this->purchase_order_number= $this->_response_array[36];
            $this->md5_hash             = $this->_response_array[37];
            $this->card_code_response   = $this->_response_array[38];
            $this->cavv_response        = $this->_response_array[39];
            $this->account_number       = $this->_response_array[50];
            $this->card_type            = $this->_response_array[51];
            $this->split_tender_id      = $this->_response_array[52];
            $this->requested_amount     = $this->_response_array[53];
            $this->balance_on_card      = $this->_response_array[54];
            
            $this->approved = ($this->response_code == self::APPROVED);
            $this->declined = ($this->response_code == self::DECLINED);
            $this->error    = ($this->response_code == self::ERROR);
            $this->held     = ($this->response_code == self::HELD);
            
            // Set custom fields
            if ($count = count($custom_fields)) {
                $custom_fields_response = array_slice($this->_response_array, -$count, $count);
                $i = 0;
                foreach ($custom_fields as $key => $value) {
                    $this->$key = $custom_fields_response[$i];
                    $i++;
                }
            }
            
            if ($this->error) {
                $this->error_message = "AuthorizeNet Error:
                Response Code: ".$this->response_code."
                Response Subcode: ".$this->response_subcode."
                Response Reason Code: ".$this->response_reason_code."
                Response Reason Text: ".$this->response_reason_text."
                ";
            }
        } else {
            $this->approved = false;
            $this->error = true;
            $this->error_message = "Error connecting to AuthorizeNet";
        }
    }

}
