<?php
    
    /**
     *   This PHP Program demonstrates how to consume the Walgreens API and upload the Images to Walgreens Storage Server & access the Check Out to order prints
     *   to one of the 8000+ Walgreens Stores in US
    
     *  Author: Vidya Rajaram - Cognizant Partner For Walgreens
     *  Mail to: devportal@walgreens.com for any questions about Walgreens API
     **/
    
    $affiliateId = "extest1";
    $apiKey = "d12ddc87a36f1cfb422dccb4ff0a7184";
    $apiEndPoint = "https://services-qa.walgreens.com/api/util/mweb5url";
    $cred_data = array(
                    "serviceType"=>"wagS3",
                    "act"=>"genCredV2",
                    "view"=>"genCredV2JSON",
                    "affId"=> $affiliateId,
                    "apiKey"=>$apiKey,
                    "devinf"=>"IE,11",
                    "appver"=>"0.01"
                  );
    
    $cred_data=json_encode($cred_data);
    echo "\nCredential Request = ",$cred_data;
    $headers = array('Content-type: application/json; charset=utf-8');
    $curl = curl_init($apiEndPoint);
    curl_setopt($curl, CURLOPT_POST, 1);
    curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $cred_data);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    
    $cred_response = curl_exec($curl);
    echo "\n\nCredential Response = ",$cred_response,"\n\n";
    $cred_response = json_decode($cred_response,TRUE);
    curl_close($curl);
    
    // File Upload Process Starts - *** Repeat For As Many Images as required using the same Credentials obtained above ***
    
    $contentMD5 = "";
    $contentType = "image/jpg";
    $fileName = "Curiosity.jpg";
    
    $fileStream=fopen('/Users/ctsuser1/Desktop/Curiosity.jpg','r');
    $flSize=filesize('/Users/ctsuser1/Desktop/Curiosity.jpg');
    // echo "\nFile Contents = ",$file,"\n\n";
    $accessKey = $cred_response['accessKeyId'];
    $sessionId = $cred_response['sessionId'];
    $uploadUrl = $cred_response['uploadUrl'];
    $bucket = str_replace('http://','',$uploadUrl);
    $secretKey = $cred_response['secretKey'];
    echo "Access Key Id = ",$accessKey,"\n\nSecret Key = ",$secretKey,"\n\nSession Id = ",$sessionId,"\n\nUpload URL = ",$uploadUrl,"\n\nFile Size = 	",$flSize,"\n\n";
    
    $date= gmdate("D, d M Y H:i:s T") ;
    echo "Date = ",$date,"\n\n";
    $canonicalizedResource = "/".$bucket."/".$fileName;
    $canonicalizedAmzHeaders = "x-amz-security-token:".$sessionId;
    //echo "Canonicalized Resource = ",$canonicalizedResource,"\n\n";
    
    $data = "PUT\n".$contentMD5."\n".$contentType."\n".$date."\n".$canonicalizedAmzHeaders."\n".$canonicalizedResource;
    echo "Data = ",$data,"\n\n";
    $signature=base64_encode(hash_hmac('sha1', $data, $secretKey, true));
    //echo "Signature = ",$signature,"\n\n";
    
    $authorization="AWS ".$accessKey.":".$signature;
    echo "authorization = ",$authorization,"\n\n";
    
    $uploadUrlRef = $uploadUrl."/".$fileName;
    //echo "uploadUrlRef = ",$uploadUrlRef,"\n\n";
    $ch = curl_init($uploadUrlRef);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT");
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 2);
    curl_setopt($ch, CURLOPT_BINARYTRANSFER, "1");
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Date:'.$date,'Content-Type:'.$contentType,'Content-Length:'.$flSize,'x-amz-security-token:'.$sessionId,'Authorization:'.$authorization));
    //curl_setopt($ch, CURLOPT_POSTFIELDS,http_build_query($fileStream));
    curl_setopt ($ch, CURLOPT_UPLOAD, true);
    curl_setopt($ch, CURLOPT_INFILE, $fileStream);
    curl_setopt($ch, CURLOPT_INFILESIZE, $flSize);
    
    $result = curl_exec($ch);
    echo "Response Code: ",curl_getinfo($ch, CURLINFO_HTTP_CODE),"\n\n";
    curl_close($ch);
    
    echo "Upload Result = ",$result,"\n\n";
    // File Upload Process Ends
    
    // Generating File Download URL - Starts
    $imageExpiryTime = time()+259200000;
    $contentTypeForDownload = "";
    $contentMD5ForDownload = "";
    $getData = "GET\n".$contentMD5ForDownload."\n".$contentTypeForDownload."\n".$imageExpiryTime."\n".$canonicalizedAmzHeaders."\n".$canonicalizedResource;
    $signatureForDownload = base64_encode(hash_hmac('sha1', $getData, $secretKey, true));
    $encodedTokenValue = urlencode($sessionId);
    $encodedSignatureValue = urlencode($signatureForDownload);
    echo "Encoding Difference = \n\n",$encodedTokenValue,"\n\n",$sessionId,"\n\n";
    $fileDownloadURL = $uploadUrlRef."?Expires=".$imageExpiryTime."&AWSAccessKeyId=".$accessKey."&x-amz-security-token=".$encodedTokenValue."&Signature=".$encodedSignatureValue;
    echo "File Download URL = ",$fileDownloadURL,"\n\n";
    // Generating File Download URL - Ends

    // Generating the Check Out URL - Starts
    $checkOutData = array(
                            "transaction"=>"photoCheckoutv2",
                            "apiKey"=>$apiKey,
                            "devinf"=>"IE,11",
                            "appver"=> "0.0",
                            "act"=>"mweb5UrlV2",
                            "view"=> "mweb5UrlV2JSON",
                            "affId"=> $affiliateId,
                            "expiryTime"=>"",
                            "images"=>array(),
                            "lat"=>"",
                            "lng"=>"",
                            "customer"=> array(
                                                "firstName"=> "",
                                                "lastName"=> "",
                                                "email"=> "",
                                                "phone"=> ""),
                            "channelInfo"=>"web",
                            "callBackLink"=>"http://www.walgreens.com",
                            "publisherId"=>"7356282",
                            "affNotes"=>""
                          );
    array_push($checkOutData['images'], $fileDownloadURL);
    $checkOutRequestData = json_encode($checkOutData);
    echo "CheckOut Request = ",$checkOutRequestData,"\n\n";
    $ch = curl_init($apiEndPoint);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $checkOutRequestData);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    
    $checkOutResponse = curl_exec($ch);
    echo "CheckOut Response = ",$checkOutResponse,"\n\n";
    $checkOutResponse = json_decode($checkOutResponse,TRUE);
    // Generating the Check Out URL - Ends
    
    echo "Access the Checkout @ ",$checkOutResponse['landingUrl'],"&token=",$checkOutResponse['token'],"\n\n";
?>