Kontrollera om digital signatur av VBA kod är giltig med JavaScript via C++

Kontrollera om digital signatur av VBA-kod är giltig i JavaScript

Följande kod visar användningen av denna egenskap med exempel excelfil som du kan ladda ner från den angivna länken. Samma excelfil har en giltig signatur, men när vi ändrar dess VBA-kod och sparar arbetsboken och sedan kontrollerar på nytt, finner vi att dess signatur har blivit ogiltig.

<!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>
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