signaturepdf/public/js/metadata.js

var windowWidth = window.innerWidth;
var menu = null;
var menuOffcanvas = null;
var is_mobile = function() {
    return !(window.getComputedStyle(document.getElementById('is_mobile')).display === "none");
};

var responsiveDisplay = function() {
    if(is_mobile()) {
        menu.classList.remove('show');
        menuOffcanvas.hide();
    } else {
        menuOffcanvas.show();
    }
    menu.classList.remove('d-md-block');
    menu.classList.remove('d-none');
};

var pdfjsLib = window['pdfjs-dist/build/pdf'];
pdfjsLib.GlobalWorkerOptions.workerSrc = '/vendor/pdf.worker.js?legacy';
var nbPDF = 0;
var pages = [];
var pdfRenderTasks = [];

var loadPDF = async function(pdfBlob, filename, pdfIndex) {
    let url = await URL.createObjectURL(pdfBlob);
    let loadingTask = pdfjsLib.getDocument(url);
    document.querySelector('#text_document_name span').innerText = filename;
    await loadingTask.promise.then(function(pdf) {
        pdf.getMetadata().then(function(metadata) {
            console.log(metadata);
            for(metaKey in metadata.info) {
                if(metaKey == "Custom" || metaKey == "PDFFormatVersion" || metaKey.match(/^Is/) || metaKey == "Trapped") {
                    continue;
                }
                addMetadata(metaKey, metadata.info[metaKey]);
            }
            for(metaKey in metadata.info.Custom) {
                if(metaKey == "sha256") {
                    continue;
                }

                addMetadata(metaKey, metadata.info.Custom[metaKey]);
            }
        });
    }, function (reason) {
        console.error(reason);
    });

    return loadingTask;
}

var addMetadata = function(key, value) {
    let div = document.createElement('div');
    div.classList.add('form-floating', 'mt-3', 'input-metadata');

    let input = document.createElement('input');
    input.value = value;
    input.classList.add('form-control');

    let label = document.createElement('label');
    label.innerText = key;

    let deleteButton = document.createElement('div')
    deleteButton.innerHTML = "×"
    deleteButton.classList.add('delete-metadata')

    div.appendChild(input);
    div.appendChild(label);
    div.appendChild(deleteButton);
    document.getElementById('form-metadata-container').appendChild(div);

    input.focus();
}

const deleteMetadata = function(el) {
    const input = el.closest('.input-metadata')
    input.remove()
}

var createEventsListener = function() {
    document.getElementById('form_metadata_add').addEventListener('submit', function(e) {
        let formData = new FormData(this);
        addMetadata(formData.get('metadata_key'), "");
        this.reset();
        e.preventDefault();
    })

    document.addEventListener('click', function (event) {
        if (event.target.closest(".delete-metadata")) {
            deleteMetadata(event.target)
        }
    })
}

async function getPDFBlobFromCache(cacheUrl) {
    const cache = await caches.open('pdf');
    let responsePdf = await cache.match(cacheUrl);

    if(!responsePdf) {
        return null;
    }

    let pdfBlob = await responsePdf.blob();

    return pdfBlob;
}

async function uploadFromUrl(url) {
    history.replaceState({}, '', '/metadata');
    var response = await fetch(url);
    if(response.status != 200) {
        return;
    }
    var pdfBlob = await response.blob();

    if(pdfBlob.type != 'application/pdf' && pdfBlob.type != 'application/octet-stream') {
        return;
    }
    let dataTransfer = new DataTransfer();
    let filename = url.replace(/^.*\//, '');
    dataTransfer.items.add(new File([pdfBlob], filename, {
        type: 'application/pdf'
    }));
    document.getElementById('input_pdf_upload').files = dataTransfer.files;
    document.getElementById('input_pdf_upload').dispatchEvent(new Event("change"));
}

var pageUpload = async function() {
    document.querySelector('body').classList.remove('bg-light');
    document.getElementById('input_pdf_upload').value = '';
    document.getElementById('page-upload').classList.remove('d-none');
    document.getElementById('page-metadata').classList.add('d-none');
    document.getElementById('input_pdf_upload').focus();
    const cache = await caches.open('pdf');
    document.getElementById('input_pdf_upload').addEventListener('change', async function(event) {
            if(document.getElementById('input_pdf_upload').files[0].size > maxSize) {

            alert("Le PDF ne doit pas dépasser " + Math.round(maxSize/1024/1024) + " Mo");
            document.getElementById('input_pdf_upload').value = "";
            return;
        }
        let filename = document.getElementById('input_pdf_upload').files[0].name;
        let response = new Response(document.getElementById('input_pdf_upload').files[0], { "status" : 200, "statusText" : "OK" });
        let urlPdf = '/pdf/'+filename;
        await cache.put(urlPdf, response);
        history.pushState({}, '', '/metadata#'+filename);
        pageMetadata(urlPdf)
    });
}

var pageMetadata = async function(url) {
    let filename = url.replace('/pdf/', '');
    document.title = filename + ' - ' + document.title;
    document.querySelector('body').classList.add('bg-light');
    document.getElementById('page-upload').classList.add('d-none');
    document.getElementById('page-metadata').classList.remove('d-none');
    menu = document.getElementById('sidebarTools');
    menuOffcanvas = new bootstrap.Offcanvas(menu);
    responsiveDisplay();

    let pdfBlob = await getPDFBlobFromCache(url);
    if(!pdfBlob) {
        document.location = '/metadata';
        return;
    }

    createEventsListener();
    loadPDF(pdfBlob, filename, nbPDF);
};

(function () {
    if(window.location.hash && window.location.hash.match(/^\#http/)) {
        let hashUrl = window.location.hash.replace(/^\#/, '');
        pageUpload();
        uploadFromUrl(hashUrl);
    } else if(window.location.hash) {
        pageMetadata('/pdf/'+window.location.hash.replace(/^\#/, ''));
    } else {
        pageUpload();
    }
    window.addEventListener('hashchange', function() {
        window.location.reload();
    })
})();