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PDF redaction in Swift

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Sample Swift code for using PDFTron SDK to remove potentially sensitive content within PDF documents. Using 'pdftron.PDF.Redactor' makes sure that if a portion of an image, text, or vector graphics is contained in a redaction region, that portion is destroyed and is not simply hidden with clipping or image masks. Learn more about our Swift PDF Library.

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//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

import PDFNet
import Foundation

// PDF Redactor is a separately licensable Add-on that offers options to remove
// (not just covering or obscuring) content within a region of PDF.
// With printed pages, redaction involves blacking-out or cutting-out areas of
// the printed page. With electronic documents that use formats such as PDF,
// redaction typically involves removing sensitive content within documents for
// safe distribution to courts, patent and government institutions, the media,
// customers, vendors or any other audience with restricted access to the content.
//
// The redaction process in PDFNet consists of two steps:
//
//  a) Content identification: A user applies redact annotations that specify the
// pieces or regions of content that should be removed. The content for redaction
// can be identified either interactively (e.g. using 'pdftron.PDF.PDFViewCtrl'
// as shown in PDFView sample) or programmatically (e.g. using 'pdftron.PDF.TextSearch'
// or 'pdftron.PDF.TextExtractor'). Up until the next step is performed, the user
// can see, move and redefine these annotations.
//  b) Content removal: Using 'pdftron.PDF.Redactor.Redact()' the user instructs
// PDFNet to apply the redact regions, after which the content in the area specified
// by the redact annotations is removed. The redaction function includes number of
// options to control the style of the redaction overlay (including color, text,
// font, border, transparency, etc.).
//
// PDFTron Redactor makes sure that if a portion of an image, text, or vector graphics
// is contained in a redaction region, that portion of the image or path data is
// destroyed and is not simply hidden with clipping or image masks. PDFNet API can also
// be used to review and remove metadata and other content that can exist in a PDF
// document, including XML Forms Architecture (XFA) content and Extensible Metadata
// Platform (XMP) content.

func Redact(input: String, output: String, vec: PTVectorRedaction, app: PTAppearance) {
    let doc: PTPDFDoc = PTPDFDoc(filepath: input)
    if doc.initSecurityHandler() {
        PTRedactor.redact(doc, red_arr: vec, app: app, ext_neg_mode: false, page_coord_sys: true)
        doc.save(toFile: output, flags: e_ptlinearized.rawValue)
    }
}

func runPDFRedactTest() -> Int {
    return autoreleasepool {
        var ret: Int = 0
        
        
        
        do {
            try PTPDFNet.catchException {
        
                let rect1: PTPDFRect = PTPDFRect(x1: 100, y1: 100, x2: 550, y2: 600)
                
                let rect2: PTPDFRect = PTPDFRect(x1: 30, y1: 30, x2: 450, y2: 450)
                
                let rect3: PTPDFRect = PTPDFRect(x1: 0, y1: 0, x2: 100, y2: 100)
                
                let rect4: PTPDFRect = PTPDFRect(x1: 100, y1: 100, x2: 200, y2: 200)
                
                let rect5: PTPDFRect = PTPDFRect(x1: 300, y1: 300, x2: 400, y2: 400)
                
                let rect6: PTPDFRect = PTPDFRect(x1: 500, y1: 500, x2: 600, y2: 600)
                
                let rect7: PTPDFRect = PTPDFRect(x1: 0, y1: 0, x2: 700, y2: 20)
                
                let vec: PTVectorRedaction = PTVectorRedaction()
                vec.add(PTRedaction(page_num: 1, bbox: rect1, negative: false, text: "Top Secret"))
                vec.add(PTRedaction(page_num: 2, bbox: rect2, negative: true, text: "Negative Redaction"))
                vec.add(PTRedaction(page_num: 2, bbox: rect3, negative: false, text: "Positive"))
                vec.add(PTRedaction(page_num: 2, bbox: rect4, negative: false, text: "Positive"))
                vec.add(PTRedaction(page_num: 2, bbox: rect5, negative: false, text: ""))
                vec.add(PTRedaction(page_num: 2, bbox: rect6, negative: false, text: ""))
                vec.add(PTRedaction(page_num: 3, bbox: rect7, negative: false, text: ""))
                
                let app: PTAppearance = PTAppearance()
                app.setRedactionOverlay(true)
                app.setBorder(false)
                
                Redact(input: Bundle.main.path(forResource: "newsletter", ofType: "pdf")!, output: URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("redacted.pdf").path, vec: vec, app: app)
                
                print("Done...")
            }
        } catch let e as NSError {
            print("\(e)")
            ret = 1
        }
        
        return ret
    }
}
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