decode and download pdf stream

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Tue Dec 07 2021 23:41:36 GMT+0000 (Coordinated Universal Time)

$('#downloadRegistrationCertificate').on('click',function(){
    downloadPdf();
});

function downloadPdf() {
    var regNum = JSON.parse(sessionStorage.getItem("sessionPath")).regNumber
    
    $.ajax({
        url: apiPathEnv + "/web/registration-service/v1/download-certificate?registrationNumber="+regNum+"&sessionToken="+sessionTokenVar,
        type: 'get',
        headers: { 
            'Accept': 'application/json',
            'Content-Type': 'application/json' 
        }
    })
    .done(function (result) {

        if(result != undefined && (result.messages == null || result.messages.length == 0)){
            console.log("REsults",result.bytes);
            var responseBytes = _base64ToArrayBuffer(result.bytes);   
            var certificateBlob = new Blob([responseBytes], {type: 'application/pdf'});
            // console.log(responseBytes);
            var downloadLink = document.createElement('a');
            downloadLink.href = window.URL.createObjectURL(certificateBlob);
            //downloadLink.download="RegistrationCertificate_" +regNum+ ".pdf";
            //downloadLink.click();
            
            var isIE = /*@cc_on!@*/false || !!document.documentMode;
            var isSafari = /constructor/i.test(window.HTMLElement) || (function (p) { return p.toString() === "[object SafariRemoteNotification]"; })(!window['safari'] || (typeof safari !== 'undefined' && window['safari'].pushNotification));

            if(isIE) { // Internet Explorer 6-11
                window.navigator.msSaveBlob(certificateBlob, 'RegistrationCertificate.pdf');
            }
            else if(isSafari) { // Safari Browser
                var newWindow = window.open(window.URL.createObjectURL(certificateBlob),'_blank')

            }
            else {
                // Mobile Devices
                if(/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)){
                    downloadLink.download="RegistrationCertificate_" +regNum+ ".pdf";
                    downloadLink.click();
                }
                // Other Browsers
                else {
                    window.open(window.URL.createObjectURL(certificateBlob), '_blank');
                }						
            }
        }
    }).fail(function (result){
        console.log(result);
        // api .fail error page redirect
        siteNotAvailable();
    });
}

function _base64ToArrayBuffer(base64) {
    var binary_string = window.atob(base64);
    var len = binary_string.length;
    var bytes = new Uint8Array(len);
    for (var i = 0; i < len; i++) {
        bytes[i] = binary_string.charCodeAt(i);
    }
    return bytes.buffer;
}

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