Vérifier si la signature numérique du code VBA est valide avec JavaScript via C++
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Aspose.Cells vous permet de vérifier si la signature numérique du code VBA est valide en utilisant la propriété Workbook.isValidSigned(). Elle retournera true si la signature est valide, sinon elle retournera false. La signature numérique du code VBA devient invalide lorsque vous modifiez le code VBA.
Vérifier si la signature numérique du code VBA est valide en JavaScript
Le code suivant démontre l’utilisation de cette propriété en utilisant le fichier Excel d’exemple, que vous pouvez télécharger à partir du lien fourni. Le même fichier Excel a une signature valide mais lorsque nous modifions son code VBA et sauvegardons le classeur, puis vérifions à nouveau, nous constatons que sa signature est devenue invalide.
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells VBA Signature Example</title>
</head>
<body>
<h1>VBA Signature Example</h1>
<input type="file" id="fileInput" accept=".xls,.xlsx,.xlsm,.csv" />
<button id="runExample">Run Example</button>
<a id="downloadLink" style="display: none;">Download Result</a>
<div id="result"></div>
</body>
<script src="aspose.cells.js.min.js"></script>
<script type="text/javascript">
const { Workbook, SaveFormat, Utils } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
document.getElementById('runExample').addEventListener('click', async () => {
const fileInput = document.getElementById('fileInput');
const resultEl = document.getElementById('result');
if (!fileInput.files.length) {
resultEl.innerHTML = '<p style="color: red;">Please select an Excel file (preferably .xlsm).</p>';
return;
}
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
// Loads the workbook which contains the VBA project
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Signature status before modification
const isSignedBefore = workbook.vbaProject.isValidSigned();
console.log("Is VBA Code Project Valid Signed: " + isSignedBefore);
// Modify the VBA Code, save the workbook then reload
// VBA Code Signature will now be invalid
let code = workbook.vbaProject.modules.get(1).codes;
code = code.replace("Welcome to Aspose", "Welcome to Aspose.Cells");
workbook.vbaProject.modules.get(1).codes = code;
// Save the modified workbook to a downloadable blob
const outputData = workbook.save(SaveFormat.Xlsm);
const blob = new Blob([outputData], { type: 'application/vnd.ms-excel.sheet.macroEnabled.12' });
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'output_out.xlsm';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Modified Excel File';
// Reload from the saved output data to verify signature status
const reloadedWorkbook = new Workbook(new Uint8Array(outputData));
const isSignedAfter = reloadedWorkbook.vbaProject.isValidSigned();
console.log("Is VBA Code Project Valid Signed: " + isSignedAfter);
// Update result UI
resultEl.innerHTML = `
<p style="color: green;">Operation completed successfully!</p>
<p>Signature valid before modification: <strong>${isSignedBefore}</strong></p>
<p>Signature valid after modification: <strong>${isSignedAfter}</strong></p>
<p>Click the download link to get the modified file.</p>
`;
});
</script>
</html>