(Go) PDF Get Encryption and Permissions Information

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Determine if a PDF is encrypted, and the associated user permissions.

Note: Some PDFs are encrypted but not password-protected. In such cases, encryption is used primarily for preventing unauthorized modifications to the document, but it doesn't restrict access. Therefore, you can open and read the document without a password.

Note: This example requires Chilkat v9.5.0.96 or later.

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    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    pdf := chilkat.NewPdf()

    // Open a PDF.
    // Starting in Chilkat v9.5.0.96, the LastJsonData will contain information about encryption and permissions.
    success := pdf.LoadFile("c:/someDir/sample.pdf")
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        return
    }

    // Examine the LastJsonData
    ljd := pdf.LastJsonData()
    ljd.SetEmitCompact(false)

    fmt.Println(*ljd.Emit())

    // Sample output:

    // {
    //   "pdfVersion": "1.6",
    //   "encrypt": {
    //     "filter": "/Standard",
    //     "keyLength": 128,
    //     "V": 4,
    //     "R": 4,
    //     "P": -1340,
    //     "perm": {
    //       "printLowResolution": "allowed",
    //       "printHighResolution": "allowed",
    //       "modifyOther": "not allowed",
    //       "modifyAnnotations": "allowed",
    //       "modifyForms": "not allowed",
    //       "fillInForms": "allowed",
    //       "assembleDoc": "allowed",
    //       "extractAnyPurpose": "not allowed",
    //       "extractAccessibility": "not allowed"
    //     },
    //     "method": "AESV2"
    //   }
    // }

    // Use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON

    pdfVersion := ljd.StringOf("pdfVersion")
    Filter := ljd.StringOf("encrypt.filter")
    KeyLength := ljd.IntOf("encrypt.keyLength")
    V := ljd.IntOf("encrypt.V")
    R := ljd.IntOf("encrypt.R")
    P := ljd.IntOf("encrypt.P")
    PrintLowResolution := ljd.StringOf("encrypt.perm.printLowResolution")
    PrintHighResolution := ljd.StringOf("encrypt.perm.printHighResolution")
    ModifyOther := ljd.StringOf("encrypt.perm.modifyOther")
    ModifyAnnotations := ljd.StringOf("encrypt.perm.modifyAnnotations")
    ModifyForms := ljd.StringOf("encrypt.perm.modifyForms")
    FillInForms := ljd.StringOf("encrypt.perm.fillInForms")
    AssembleDoc := ljd.StringOf("encrypt.perm.assembleDoc")
    ExtractAnyPurpose := ljd.StringOf("encrypt.perm.extractAnyPurpose")
    ExtractAccessibility := ljd.StringOf("encrypt.perm.extractAccessibility")
    Method := ljd.StringOf("encrypt.method")

    pdf.DisposePdf()