Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Removing PDF password using Swift
//
// 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
You can’t perform that action at this time.