(Swift 3,4,5...) 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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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let pdf = CkoPdf()!

    // Open a PDF.
    // Starting in Chilkat v9.5.0.96, the LastJsonData will contain information about encryption and permissions.
    var success: Bool = pdf.loadFile("c:/someDir/sample.pdf")
    if success == false {
        print("\(pdf.lastErrorText!)")
        return
    }

    // Examine the LastJsonData
    var ljd: CkoJsonObject? = pdf.lastJsonData()
    ljd.emitCompact = false

    print("\(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

    var pdfVersion: String? = ljd!.string(of: "pdfVersion")
    var Filter: String? = ljd!.string(of: "encrypt.filter")
    var KeyLength: Int = ljd!.int(of: "encrypt.keyLength").intValue
    var V: Int = ljd!.int(of: "encrypt.V").intValue
    var R: Int = ljd!.int(of: "encrypt.R").intValue
    var P: Int = ljd!.int(of: "encrypt.P").intValue
    var PrintLowResolution: String? = ljd!.string(of: "encrypt.perm.printLowResolution")
    var PrintHighResolution: String? = ljd!.string(of: "encrypt.perm.printHighResolution")
    var ModifyOther: String? = ljd!.string(of: "encrypt.perm.modifyOther")
    var ModifyAnnotations: String? = ljd!.string(of: "encrypt.perm.modifyAnnotations")
    var ModifyForms: String? = ljd!.string(of: "encrypt.perm.modifyForms")
    var FillInForms: String? = ljd!.string(of: "encrypt.perm.fillInForms")
    var AssembleDoc: String? = ljd!.string(of: "encrypt.perm.assembleDoc")
    var ExtractAnyPurpose: String? = ljd!.string(of: "encrypt.perm.extractAnyPurpose")
    var ExtractAccessibility: String? = ljd!.string(of: "encrypt.perm.extractAccessibility")
    var Method: String? = ljd!.string(of: "encrypt.method")

}