Zig Requires Chilkat v11.0.0+

PDF Get Encryption and Permissions Information

See more PDF Signatures Examples

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.

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

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

    const pdf = try chilkat.Pdf.init();
    defer pdf.deinit();

    // Load a PDF.
    pdf.loadFile("c:/someDir/sample.pdf") catch {
        std.debug.print("{s}\n", .{try pdf.getLastErrorText(alloc)});
        return;
    };

    // Get information about the PDF that was collected in the call to LoadFile.
    const ljd = try chilkat.JsonObject.init();
    defer ljd.deinit();
    pdf.getLastJsonData(ljd);

    ljd.setEmitCompact(false);

    std.debug.print("{s}\n", .{try ljd.emit(alloc)});

    // 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

    _ = try ljd.stringOf(alloc, "pdfVersion");
    _ = try ljd.stringOf(alloc, "encrypt.filter");
    _ = ljd.intOf("encrypt.keyLength");
    _ = ljd.intOf("encrypt.V");
    _ = ljd.intOf("encrypt.R");
    _ = ljd.intOf("encrypt.P");
    _ = try ljd.stringOf(alloc, "encrypt.perm.printLowResolution");
    _ = try ljd.stringOf(alloc, "encrypt.perm.printHighResolution");
    _ = try ljd.stringOf(alloc, "encrypt.perm.modifyOther");
    _ = try ljd.stringOf(alloc, "encrypt.perm.modifyAnnotations");
    _ = try ljd.stringOf(alloc, "encrypt.perm.modifyForms");
    _ = try ljd.stringOf(alloc, "encrypt.perm.fillInForms");
    _ = try ljd.stringOf(alloc, "encrypt.perm.assembleDoc");
    _ = try ljd.stringOf(alloc, "encrypt.perm.extractAnyPurpose");
    _ = try ljd.stringOf(alloc, "encrypt.perm.extractAccessibility");
    _ = try ljd.stringOf(alloc, "encrypt.method");
}