Subversion Repositories cheapmusic

<?php

include_once ('php/constants.php');

error_reporting(E_ALL);

// Get itunes listings

function get_amazon($query, $searchCondition) {

    $vendors = Vendors::getInstance();

    $config = $vendors->getVendor(Vendors::AMAZON);

    $needMatches = empty($_SESSION["discogs"]);

    $arrMusic = [];

    $arrDigital = [];

    $arrBooks = [];

    // Music

    $arrMusic = get_amazonCategory($config, $query, "Music", $needMatches);

    // Digital Music

    if ($_SESSION["filterMediaType"]["Digital"]) {

        $arrDigital = get_amazonCategory($config, $query, "DigitalMusic");

    }

    if ($_SESSION["filterMediaType"]["Book"]) {

        // Books

        $arrBooks = get_amazonCategory($config, $query, "Books");

    }

    return (array_merge($arrMusic, $arrDigital, $arrBooks));

}

// Get Amazon listings

function get_amazonCategory($config, $query, $searchIndex, $needMatches = false) {

    $numResults = $config['numResults'];

    if ($needMatches) {

        $_SESSION["discogs"] = "";

    }

    $response = getSearchCache("amazon", $query, $searchIndex);

    if ($response === false) {

        $serviceName = "ProductAdvertisingAPI";

        $region = "us-east-1";

        $accessKey = $config["access_key_id"];

        $secretKey = $config["secret_key"];

        $associate_tag = $config['associate_tag'];

$payload="{"

        ." \"Keywords\": \"$query\","

        ." \"Resources\": ["

        ."  \"Images.Primary.Medium\","

        ."  \"Images.Primary.Large\","

        ."  \"ItemInfo.ByLineInfo\","

        ."  \"ItemInfo.ContentInfo\","

        ."  \"ItemInfo.Classifications\","

        ."  \"ItemInfo.ExternalIds\","

        ."  \"ItemInfo.ManufactureInfo\","

        ."  \"ItemInfo.ProductInfo\","

        ."  \"ItemInfo.TechnicalInfo\","

        ."  \"ItemInfo.Title\","

        ."  \"Offers.Listings.Condition\","

        ."  \"Offers.Listings.Condition.SubCondition\","

        ."  \"Offers.Listings.DeliveryInfo.IsAmazonFulfilled\","

        ."  \"Offers.Listings.DeliveryInfo.IsFreeShippingEligible\","

        ."  \"Offers.Listings.DeliveryInfo.IsPrimeEligible\","

        ."  \"Offers.Listings.DeliveryInfo.ShippingCharges\","

        ."  \"Offers.Listings.MerchantInfo\","

        ."  \"Offers.Listings.Price\""

        ." ],"

        ." \"SearchIndex\": \"$searchIndex\","

        ." \"Availability\": \"Available\","

        ." \"Condition\": \"Any\","

        ." \"OfferCount\": 3,"

        ." \"SortBy\": \"Price:LowToHigh\","

        ." \"PartnerTag\": \"$associate_tag\","

        ." \"PartnerType\": \"Associates\","

        ." \"Marketplace\": \"www.amazon.com\""

        ."}";

        $host = "webservices.amazon.com";

        $uriPath = "/paapi5/searchitems";

        $awsv4 = new AwsV4($accessKey, $secretKey);

        $awsv4->setRegionName($region);

        $awsv4->setServiceName($serviceName);

        $awsv4->setPath($uriPath);

        $awsv4->setPayload($payload);

        $awsv4->setRequestMethod("POST");

        $awsv4->addHeader('content-encoding', 'amz-1.0');

        $awsv4->addHeader('content-type', 'application/json; charset=utf-8');

        $awsv4->addHeader('host', $host);

        $awsv4->addHeader('x-amz-target', 'com.amazon.paapi5.v1.ProductAdvertisingAPIv1.SearchItems');

        $headers = $awsv4->getHeaders();

        $headerArr = [];

        foreach ($headers as $key => $value) {

            $headerArr[] = $key . ': ' . $value;

        }

        $ch = curl_init();

        curl_setopt($ch, CURLOPT_HTTPHEADER, $headerArr);

        curl_setopt($ch, CURLOPT_URL, 'https://' . $host . $uriPath);

        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

        curl_setopt($ch, CURLOPT_TIMEOUT, 15);

        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);

        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);

        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        curl_setopt($ch, CURLOPT_REFERER, 'https://' . $host . $uriPath);

        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);

        curl_setopt($ch, CURLOPT_POST, 1);

        $response = curl_exec($ch);

        curl_close($ch);

        saveSearchCache("amazon", $query, $searchIndex, $response);

    }

    $parsed_json = json_decode($response);

//echo "<br><pre>";print_r($parsed_json);echo "</pre>";

    $arr = [];

    if (isset($parsed_json->Errors)) {

        foreach ($parsed_json->Errors as $error) {

            if ($error->Code != "NoResults") {

                my_error_log("Amazon Search - " . $error->Message . " (" . $error->Code . ")");

            }

        }

        return [];

    }

    if ($needMatches) {

        $cnt = 0;

        $_SESSION["discogs"] = startMatches();

    }

    $listings = 0;

    // If the response was loaded, parse it and store in array

    foreach ($parsed_json->SearchResult->Items as $current) {

        // [ProductGroup] => Digital Music Album

        if ($searchIndex == "MP3Downloads" && !empty($current->ItemAttributes->TrackSequence)) {

            continue; // skip individual songs

        }

        if (isset($current->ItemInfo->ExternalIds->UPCs)) {

            $barcode = (string)$current->ItemInfo->ExternalIds->UPCs->DisplayValues[0];

        }

        else if (isset($current->ItemInfo->ExternalIds->EANs)) {

            $barcode = (string)$current->ItemInfo->ExternalIds->EANs->DisplayValues[0];

        }

        else if (isset($current->ItemInfo->ExternalIds->ISBNs)) {

            $barcode = (string)$current->ItemInfo->ExternalIds->ISBNs->DisplayValues[0];

        }

        else if (isset($current->ItemInfo->ExternalIds->EISBNs)) {

            $barcode = (string)$current->ItemInfo->ExternalIds->EISBNs->DisplayValues[0];

        }

        else {

            $barcode = "";

        }

        $barcodeType = clsLibGTIN::GTINCheck($barcode, false, 1);

        $pic = str_replace('http://', 'https://', (string)$current->Images->Primary->Medium->URL);

        if (empty($pic)) {

            continue;

        }

        if (strpos($current->ItemInfo->Classifications->Binding->DisplayValue, "Audio CD") !== false) {

            $mediaType = "CD";

        }

        else if (strpos($current->ItemInfo->Classifications->Binding->DisplayValue, "MP3 Music") !== false) {

            $mediaType = "Digital";

        }

        else if (strpos($current->ItemInfo->Classifications->Binding->DisplayValue, "Vinyl") !== false) {

            $mediaType = "Record";

        }

        else if (strpos($current->ItemInfo->Classifications->Binding->DisplayValue, "Paperback") !== false || strpos($current->ItemInfo->Classifications->Binding->DisplayValue, "Sheet") !== false || strpos($current->ItemInfo->Classifications->Binding->DisplayValue, "Hardcover") !== false) {

            $mediaType = "Book";

        }

        else {

            continue;

        }

        if ($needMatches) {

            // bugbug: check maxMasterCnt?

            $_SESSION["discogs"] .= addMatch($current, ++$cnt, $mediaType);

        }

        $title = (string)$current->ItemInfo->Title->DisplayValue;

        $artists = getArtists($current);

        $contributers = getContributers($current);

        if (!empty($artists)) {

            $title .= " by " . join(", ", $artists);

        }

        else if (!empty($contributers)) {

            $title .= " by " . join(", ", $contributers);

        }

        $url = str_replace('http://', 'https://', (string)$current->DetailPageURL);

        if (empty($url)) {

            continue;

        }

        $bestOffer = false;

        $url = str_replace('http://', 'https://', (string)$current->DetailPageURL);

        $url .= "&condition=";

        if (!empty($current->Offers->Listings)) {

            foreach ($current->Offers->Listings as $offer) {

                $country = 'US';

                if (isset($offer->MerchantInfo->DefaultShippingCountry)) {

                    $country = $offer->MerchantInfo->DefaultShippingCountry;

                }

                $merchantName = "Amazon";

                if (strpos($offer->MerchantInfo->Name, "Amazon") === false) {

                    $merchantName .= " Marketplace";

                }

                $condition = (string)$offer->Condition->Value;

                $url .= $condition;

                $detailCondition = $condition;

                if ($condition == "Collectible") {

                    $condition = 'Used';

                    $detailCondition = "Collectible";

                }

                if ($condition == "Refurbished") {

                    $condition = 'Used';

                    $detailCondition = "Refurbished";

                }

                $currency = (string)$offer->Price->Currency;

                $price = number_format(floatval($offer->Price->Amount) , 2, '.', '');

                if ($price <= "0.00") {

                    continue;

                }

                $timeLeft = 0;

                $listingType = 'Fixed';

                $location = 'US';

                $zip = '';

                $feedbackScore = - 1;

                $feedbackPercent = - 1;

                $sellerName = "";

                $handlingTime = 0;

                if ($offer->DeliveryInfo->IsPrimeEligible === true) {

                    $sellerName = "Prime";

                }

                if ($mediaType == "Digital") {

                    $shippingCost = 0.00;

                    $shippingEstimated = false;

                    $shippingCurrency = 'USD';

                }

                else {

                    $shippingCost = 3.99; // bugbug

                    $shippingEstimated = true; // bugbug

                    $shippingCurrency = 'USD';

                }

                $freeShippingCap = !empty($offer->DeliveryInfo->IsFreeShippingEligible) ? 25 : 0;

                if (++$listings > $numResults) {

                    continue;

                }

                $arr[] = array(

                    "Merchant" => $merchantName,

                    "Condition" => $condition,

                    "Title" => $title,

                    "Barcode" => $barcode,

                    "BarcodeType" => $barcodeType,

                    "Image" => $pic,

                    "URL" => $url,

                    "MediaType" => $mediaType,

                    "DetailCondition" => $detailCondition,

                    "Country" => $country,

                    "BestOffer" => $bestOffer,

                    "TimeLeft" => $timeLeft,

                    "Price" => $price,

                    "Currency" => $currency,

                    "ListingType" => $listingType,

                    "Location" => $location,

                    "Zip" => $zip,

                    "FeedbackScore" => $feedbackScore,

                    "FeedbackPercent" => $feedbackPercent,

                    "SellerName" => $sellerName,

                    "HandlingTime" => $handlingTime,

                    "ShippingCost" => $shippingCost,

                    "ShippingEstimated" => $shippingEstimated,

                    "ShippingCurrency" => $shippingCurrency,

                    "FreeShippingCap" => $freeShippingCap,

                    "Show" => true

                );

            }

        }

    }

    if ($needMatches) {

        if ($cnt = 0) {

            $_SESSION["discogs"] = "";

        }

        else {

            $_SESSION["discogs"] .= endMatches();

        }

    }

    // If the response does not indicate 'Success,' log the error(s)

    /******************

    else {

        my_error_log($url);

        if (!empty($parsed_json->OperationRequest->Errors)) {

            foreach($parsed_json->OperationRequest->Errors->Error as $error){

                my_error_log($error->Message . " (" . $error->Code . ")");

            }

        } else if (!empty($parsed_json->Errors)) {

            foreach($parsed_json->OperationRequest->Errors->Error as $error){

                my_error_log($error->Message . " (" . $error->Code . ")");

            }

        } else if (!empty($parsed_json->Error)) {

            my_error_log($parsed_json->Error->Message . " (" . $parsed_json->Error->Code . ")");

        } else {

            my_error_log(print_r($result, 1));

        }

    }

    ******************/

    return $arr;

}

function startMatches() {

    $str = "<div class=\"container-fluid bg-secondary\">";

    $str .= "<h4 class=\"text-center py-2\">Matching Albums</h4>";

    $str .= "<form method=\"post\" action=\"/index.php\">";

    $str .= "<input type=\"hidden\" name=\"sessionTab\" value=\"" . MySessionHandler::getSessionTab() . "\">";

    $str .= "<input id=\"discogsTitle\" type=\"hidden\" name=\"discogsTitle\" value=\"\">";

    $str .= "<input id=\"discogsArtist\" type=\"hidden\" name=\"discogsArtist\" value=\"\">";

    $str .= "<input id=\"discogsBarcode\" type=\"hidden\" name=\"discogsBarcode\" value=\"\">";

    $str .= "<div id=\"discogsDeck\" class=\"card-deck\">";

    return $str;

}

function endMatches() {

    $str = "</div>";

    $str .= "</form>";

    $str .= "</div>";

    return $str;

}

function addMatch($item, $cnt, $mediaType) {

    $artists = getArtists($item);

    $contributers = getContributers($item);

    $label = "";

    if (!empty($item->ItemInfo->ByLineInfo->Manufacturer)) {

        $label = $item->ItemInfo->ByLineInfo->Manufacturer.DisplayValue;

    }

    $languages = [];

    if (!empty($item->ItemInfo->ContentInfo->Languages)) {

        foreach ($item->ItemInfo->ContentInfo->Languages->DisplayValues as $language) {

            if ((string)$language->Type != "Unknown") {

                $languages[] = $language->DisplayValue . " (" . $language->Type . ")";

            }

        }

    }

    $modal = "";

    $str = "<div class=\"card mx-auto discogs-card\">";

    $str .= "<div class=\"card-header bg-info d-flex h-100\">";

    $str .= "<p class=\"card-title font-weight-bold small flex-grow-1\">" . (string)$item->ItemInfo->Title->DisplayValue . " by ";

    $searchArtists = "";

    if (!empty($artists)) {

        if (count($artists) < 5) {

            $wlArtists = join(", ", $artists);

            if (!empty($artists) && $artists[0] != 'Various') {

                $searchArtists = join(" ", $artists);

            }

        } else {

            $wlArtists = "Various Artists";

        }

    }

    else if (!empty($contributers)) {

        if (count($contributers) < 5) {

            $wlArtists = join(", ", $contributers);

            if (!empty($contributers) && $contributers[0] != 'Various') {

                $searchArtists = join(" ", $contributers);

            }

        } else {

            $wlArtists = "Various Artists";

        }

    }

    $str .= $wlArtists;

    $str .= "</p>";

    $str .= "</div>";

    $thumbnail = !empty($item->Images->Primary->Medium->URL) ? (string)$item->Images->Primary->Medium->URL : "images/no-image-available.jpg";

    $str .= "<div class=\"card-body bg-light mx-auto p-0 m-0\">";

    $str .= "<img class=\"btn responsive-image p-0 m-0\" src=\"" . $thumbnail . "\" data-toggle=\"modal\" data-target=\"#masterModal" . $cnt . "\" title=\"Album Information\" data-toggle2=\"tooltip\" alt=\"Cover Thumbnail\">";

    $str .= "</div>";

    $str .= "<div class=\"card-footer bg-dark p-0 m-0\">";

    $str .= "<div class=\"container clearfix p-0 m-0\">";

    $str .= "<span class=\"float-left\">";

    $str .= "<button type=\"button\" class=\"btn btn-primary m-1 btn-sm\" data-toggle=\"modal\" data-target=\"#masterModal" . $cnt . "\" title=\"Album Information\" data-toggle2=\"tooltip\"><i class=\"fas fa-info\"></i></button>";

    $str .= "</span>";

    $str .= "<span class=\"float-right\">";

    $barcode = "";

    $tmpBarcode = "";

    if (isset($item->ItemInfo->ExternalIds->UPCs)) {

        $tmpBarcode = (string)$item->ItemInfo->ExternalIds->UPCs->DisplayValues[0];

    }

    else if (isset($item->ItemInfo->ExternalIds->EANs)) {

        $tmpBarcode = (string)$item->ItemInfo->ExternalIds->EANs->DisplayValues[0];

    }

    else if (isset($item->ItemInfo->ExternalIds->ISBNs)) {

        $tmpBarcode = (string)$item->ItemInfo->ExternalIds->ISBNs->DisplayValues[0];

    }

    else if (isset($item->ItemInfo->ExternalIds->EISBNs)) {

        $tmpBarcode = (string)$item->ItemInfo->ExternalIds->EISBNs->DisplayValues[0];

    }

    $barcodeType = clsLibGTIN::GTINCheck($tmpBarcode, false, 1);

    if (!empty($barcodeType)) {

        $barcode = $tmpBarcode;

    }

    if (isLoggedIn() && !checkWishlist('asin', $item->ASIN)) {

        $wlArr = array(

            'asin' => (string)$item->ASIN,

            'title' => (string)$item->ItemInfo->Title->DisplayValue,

            'artist' => $wlArtists,

            'barcode' => $barcode,

            'thumbnail' => $thumbnail,

            'url' => (string)$item->DetailPageURL

        );

        $wl = base64_encode(json_encode($wlArr));

        $str .= "  <button type=\"button\" class=\"btn btn-primary m-1 btn-sm\" onclick=\"addWishlist('" . $_SESSION['sessData']['userID'] . "',this," . $cnt . ",'" . $wl . "');\" title=\"Add to Wishlist\" data-toggle=\"tooltip\"><i class=\"fas fa-bookmark\"></i></button>";

    }

    $searchTitle = 'Searching for:<br><br><strong>' . (string)$item->ItemInfo->Title->DisplayValue . ' by' . $wlArtists . '</strong>';

    if (!empty($barcode)) {

        $searchTitle .= " (" . displayBarcode($barcode) . ")";

    }

    $str .= "  <button type=\"submit\" name=\"submit\" value=\"discogsSearch\" class=\"btn btn-primary m-1 btn-sm\" onclick=\"document.getElementById('discogsTitle').value = '" . addslashes((string)$item->ItemInfo->Title->DisplayValue) . "';document.getElementById('discogsArtist').value = '" . addslashes($searchArtists) . "';document.getElementById('discogsBarcode').value = '" . $barcode . "';progressBar('" . sanitizeInput2($searchTitle) . "');\" title=\"Search for Store Offers\" data-toggle=\"tooltip\"><i class=\"fas fa-search\"></i></button>";

    $str .= "</span>";

    $str .= "</div>";

    $str .= "<span id=\"wishlistAdd" . $cnt . "\"></span>";

    $str .= "</div>";

    $modal .= "<div id=\"masterModal" . $cnt . "\" class=\"modal\">";

    $modal .= "<div class=\"modal-dialog\">";

    $modal .= "<div class=\"modal-content\">";

    $modal .= "<div class=\"modal-header bg-primary\">";

    $modal .= "<h4 class=\"modal-title mx-auto\">" . (string)$item->ItemInfo->Title->DisplayValue . " by " . $wlArtists . "</h4>";

    $modal .= "<button type=\"button\" class=\"close\" data-dismiss=\"modal\"><i class=\"fas fa-window-close btn-dismiss\"></i></button>";

    $modal .= "</div>";

    $modal .= "<div class=\"modal-body bg-white mx-auto\">";

    if (!empty($item->Images->Primary->Large->URL)) {

        $modal .= "<img class=\"responsive-image mx-auto mb-4\" src=\"" . (string)$item->Images->Primary->Large->URL . "\" alt=\"Cover Image\">";

    }

    $modal .= "<table class=\"table-borderless table-condensed small mx-auto\">";

    $modal .= "<tr><td class=\"px-1\">Title:</td><td class=\"px-1\">" . (string)$item->ItemInfo->Title->DisplayValue . "</td></tr>";

    $modal .= "<tr><td class=\"px-1\">Artist:</td><td class=\"px-1\">" . join(", ", $artists) . "</td></tr>";

    if (!empty($contributers)) {

        $modal .= "<tr><td class=\"px-1\">Creator:</td><td class=\"px-1\">" . join(", ", $contributers) . "</td></tr>";

    }

    if (!empty($actors)) {

        $modal .= "<tr><td class=\"px-1\">Actor:</td><td class=\"px-1\">" . join(", ", $actors) . "</td></tr>";

    }

    if (!empty($directors)) {

        $modal .= "<tr><td class=\"px-1\">Director:</td><td class=\"px-1\">" . join(", ", $directors) . "</td></tr>";

    }

    if (!empty($authors)) {

        $modal .= "<tr><td class=\"px-1\">Author:</td><td class=\"px-1\">" . join(", ", $authors) . "</td></tr>";

    }

    if (!empty($item->ItemInfo->Classifications->Binding)) {

        $modal .= "<tr><td class=\"px-1\">Type:</td><td class=\"px-1\">" . (string)$item->ItemInfo->Classifications->Binding->DisplayValue . "</td></tr>";

    }

    if (!empty($item->ItemAttributes->MediaType)) {

        $modal .= "<tr><td class=\"px-1\">Media Type:</td><td class=\"px-1\">" . (string)$item->ItemAttributes->MediaType . "</td></tr>";

    }

    if (!empty($barcode)) {

        $modal .= "<tr><td class=\"px-1\">Barcode:</td><td class=\"px-1\">" . displayBarcode($barcode) . "</td></tr>";

    }

    if (!empty($label)) {

        $modal .= "<tr><td class=\"px-1\">Label:</td><td class=\"px-1\">" . $label . "</td></tr>";

    }

    if (!empty($languages)) {

        $modal .= "<tr><td class=\"px-1\">Languages:</td><td class=\"px-1\">" . join(", ", $languages) . "</td></tr>";

    }

    if (!empty($item->ItemInfo->ContentInfo->PublicationDate)) {

        $modal .= "<tr><td class=\"px-1\">Publication Date:</td><td class=\"px-1\">" . (string)$item->ItemInfo->ContentInfo->PublicationDate . "</td></tr>";

    }

    if (!empty($item->ItemInfo->ContentInfo->ReleaseDate)) {

        $modal .= "<tr><td class=\"px-1\">Release Date:</td><td class=\"px-1\">" . (string)$item->ItemInfo->ContentInfo->ReleaseDate . "</td></tr>";

    }

    if (!empty($item->ItemInfo->ContentInfo->UnitCount->DisplayValue)) {

        $modal .= "<tr><td class=\"px-1\">Number of Discs:</td><td class=\"px-1\">" . (string)$item->ItemInfo->ContentInfo->UnitCount->DisplayValue . "</td></tr>";

    }

    if (!empty($item->ItemInfo->ContentInfo->PagesCount->DisplayValue)) {

        $modal .= "<tr><td class=\"px-1\">Number of Pages:</td><td class=\"px-1\">" . (string)$item->ItemInfo->ContentInfo->PagesCount->DisplayValue . "</td></tr>";

    }

    $modal .= "</table>";

    $modal .= "</div>";

    $modal .= "<div class=\"modal-footer bg-white justify-content-between\">";

    $modal .= "<span class=\"float-right\"><button type=\"button\" class=\"btn btn-danger\" data-dismiss=\"modal\">Close</button></span>";

    $modal .= "</div>";

    $modal .= "</div>";

    $modal .= "</div>";

    $modal .= "</div>";

    $str .= $modal;

    $str .= "</div>";

    return $str;

}

function getArtists($item) {

    $artists = [];

    if (!empty($item->ItemInfo->ByLineInfo->Contributors)) {

        foreach ($item->ItemInfo->ByLineInfo->Contributors as $artist) {

            if ((string)$artist->Role == "Artist") {

                $artists[] = $artist->Name;

            }

        }

    }

    return $artists;

}

function getContributers($item) {

    $contributers = [];

    if (!empty($item->ItemInfo->ByLineInfo->Contributors)) {

        foreach ($item->ItemInfo->ByLineInfo->Contributors as $creator) {

            if ((string)$creator->Role == "Primary Contributor") {

                $contributers[] = $creator->Name;

            }

            else {

                $contributers[] = $creator->Name . " (" . $creator->Role . ")";

            }

        }

    }

    return $contributers;

}

class AwsV4 {

    private $accessKey = null;

    private $secretKey = null;

    private $path = null;

    private $regionName = null;

    private $serviceName = null;

    private $httpMethodName = null;

    private $queryParametes = array();

    private $awsHeaders = array();

    private $payload = "";

    private $HMACAlgorithm = "AWS4-HMAC-SHA256";

    private $aws4Request = "aws4_request";

    private $strSignedHeader = null;

    private $xAmzDate = null;

    private $currentDate = null;

    public function __construct($accessKey, $secretKey) {

        $this->accessKey = $accessKey;

        $this->secretKey = $secretKey;

        $this->xAmzDate = $this->getTimeStamp();

        $this->currentDate = $this->getDate();

    }

    function setPath($path) {

        $this->path = $path;

    }

    function setServiceName($serviceName) {

        $this->serviceName = $serviceName;

    }

    function setRegionName($regionName) {

        $this->regionName = $regionName;

    }

    function setPayload($payload) {

        $this->payload = $payload;

    }

    function setRequestMethod($method) {

        $this->httpMethodName = $method;

    }

    function addHeader($headerName, $headerValue) {

        $this->awsHeaders[$headerName] = $headerValue;

    }

    private function prepareCanonicalRequest() {

        $canonicalURL = "";

        $canonicalURL .= $this->httpMethodName . "\n";

        $canonicalURL .= $this->path . "\n" . "\n";

        $signedHeaders = '';

        foreach ($this->awsHeaders as $key => $value) {

            $signedHeaders .= $key . ";";

            $canonicalURL .= $key . ":" . $value . "\n";

        }

        $canonicalURL .= "\n";

        $this->strSignedHeader = substr($signedHeaders, 0, -1);

        $canonicalURL .= $this->strSignedHeader . "\n";

        $canonicalURL .= $this->generateHex($this->payload);

        return $canonicalURL;

    }

    private function prepareStringToSign($canonicalURL) {

        $stringToSign = '';

        $stringToSign .= $this->HMACAlgorithm . "\n";

        $stringToSign .= $this->xAmzDate . "\n";

        $stringToSign .= $this->currentDate . "/" . $this->regionName . "/" . $this->serviceName . "/" . $this->aws4Request . "\n";

        $stringToSign .= $this->generateHex($canonicalURL);

        return $stringToSign;

    }

    private function calculateSignature($stringToSign) {

        $signatureKey = $this->getSignatureKey($this->secretKey, $this->currentDate, $this->regionName, $this->serviceName);

        $signature = hash_hmac("sha256", $stringToSign, $signatureKey, true);

        $strHexSignature = strtolower(bin2hex($signature));

        return $strHexSignature;

    }

    public function getHeaders() {

        $this->awsHeaders['x-amz-date'] = $this->xAmzDate;

        ksort($this->awsHeaders);

        // Step 1: CREATE A CANONICAL REQUEST

        $canonicalURL = $this->prepareCanonicalRequest();

        // Step 2: CREATE THE STRING TO SIGN

        $stringToSign = $this->prepareStringToSign($canonicalURL);

        // Step 3: CALCULATE THE SIGNATURE

        $signature = $this->calculateSignature($stringToSign);

        // Step 4: CALCULATE AUTHORIZATION HEADER

        if ($signature) {

            $this->awsHeaders['Authorization'] = $this->buildAuthorizationString($signature);

            return $this->awsHeaders;

        }

    }

    private function buildAuthorizationString($strSignature) {

        return $this->HMACAlgorithm . " " . "Credential=" . $this->accessKey . "/" . $this->getDate() . "/" . $this->regionName . "/" . $this->serviceName . "/" . $this->aws4Request . "," . "SignedHeaders=" . $this->strSignedHeader . "," . "Signature=" . $strSignature;

    }

    private function generateHex($data) {

        return strtolower(bin2hex(hash("sha256", $data, true)));

    }

    private function getSignatureKey($key, $date, $regionName, $serviceName) {

        $kSecret = "AWS4" . $key;

        $kDate = hash_hmac("sha256", $date, $kSecret, true);

        $kRegion = hash_hmac("sha256", $regionName, $kDate, true);

        $kService = hash_hmac("sha256", $serviceName, $kRegion, true);

        $kSigning = hash_hmac("sha256", $this->aws4Request, $kService, true);

        return $kSigning;

    }

    private function getTimeStamp() {

        return gmdate("Ymd\THis\Z");

    }

    private function getDate() {

        return gmdate("Ymd");

    }

}