Removing PDF password using Swift
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// | |
// PDF.swift | |
// | |
// Created by Ben Bahrenburg on 1/1/17. | |
// Copyright © 2017 bencoding.. All rights reserved. | |
// | |
import UIKit | |
open class PDFHelpers { | |
class open func unlock(data: Data, password: String) -> CGPDFDocument? { | |
if let pdf = CGPDFDocument(CGDataProvider(data: data as CFData)!) { | |
guard pdf.isEncrypted == true else { return pdf } | |
guard pdf.unlockWithPassword("") == false else { return pdf } | |
if let cPasswordString = password.cString(using: String.Encoding.utf8) { | |
if pdf.unlockWithPassword(cPasswordString) { | |
return pdf | |
} | |
} | |
} | |
return nil | |
} | |
class open func removePassword(data: Data, existingPDFPassword: String) throws -> Data? { | |
if let pdf = unlock(data: data, password: existingPDFPassword) { | |
let data = NSMutableData() | |
autoreleasepool { | |
let pageCount = pdf.numberOfPages | |
UIGraphicsBeginPDFContextToData(data, .zero, nil) | |
for index in 1...pageCount { | |
let page = pdf.page(at: index) | |
let pageRect = page?.getBoxRect(CGPDFBox.mediaBox) | |
UIGraphicsBeginPDFPageWithInfo(pageRect!, nil) | |
let ctx = UIGraphicsGetCurrentContext() | |
ctx?.interpolationQuality = .high | |
// Draw existing page | |
ctx!.saveGState() | |
ctx!.scaleBy(x: 1, y: -1) | |
ctx!.translateBy(x: 0, y: -(pageRect?.size.height)!) | |
ctx!.drawPDFPage(page!) | |
ctx!.restoreGState() | |
} | |
UIGraphicsEndPDFContext() | |
} | |
return data as Data | |
} | |
return nil | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment