Download the embedded PDF file uploaded to WKWebView

Question

When loading a page HTML5from url, I get pdf somewhere on this page, and I need to download this pdf file or save it as base64.

Here pdf is in HTML code. I can’t just hit the URL 'src' and get the pdf.

< embed width="100%" height="100%" name="plugin" id="plugin" src="https://myurl.com/fileToOpen.pdf" type="application/pdf" internalinstanceid="8" title="">

Any JS that can help me get a line of base64this or any other method to load?

Answer 1

Update

From docs say

The Fetch API provides an interface for retrieving resources (including across the network). This will sound familiar to anyone who has used XMLHttpRequest

, base64 String WKWebview

 let s = "path = document.getElementById(\"plugin\").src\n" +
        "\n" +
        "fetch(path).then(function (response) {\n" +
        " response.body.getReader().read().then(function(result) {\n" +
        " return btoa(String.fromCharCode.apply(null, result.value));\n" +
        " }).then(function(b64) {\n" +
        " window.webkit.messageHandlers.myInterface.postMessage(b64);\n" +
        " });\n" +
        "});"

fetch, xmlhttp async.. , , , , Swift javascript- ios (WKScriptMessageHandler)

, base64 javascript Swift. WKScriptMessageHandler, Javascript , base64 . String s URL- pdf , ajax, pdf, base64.

import UIKit
import WebKit
class ViewController: UIViewController {
    @IBOutlet weak var btnPDF: UIButton!
    @IBOutlet weak var webViewParentView: UIView!
    var activityIndicator: UIActivityIndicatorView?
    var webView: WKWebView!
    @objc func didSelect(_ sender: UIView){
        let s="var xhr = new XMLHttpRequest();\n" +
            "xhr.open(\'GET\', \"https://codingexceptions.com/wkwebview/dummy.pdf\", true);\n" +
            "\n" +
            "xhr.responseType = \'arraybuffer\';\n" +
            "\n" +
            "xhr.onload = function(e) {\n" +
            " if (this.status == 200) {\n" +
            " var uInt8Array = new Uint8Array(this.response);\n" +
            " var i = uInt8Array.length;\n" +
            " var binaryString = new Array(i);\n" +
            " while (i--)\n" +
            " {\n" +
            " binaryString[i] = String.fromCharCode(uInt8Array[i]);\n" +
            " }\n" +
            " var data = binaryString.join(\'\');\n" +
            "\n" +
            " var base64 = window.btoa(data);\n" +
            "\n" +
            "window.webkit.messageHandlers.myInterface.postMessage(base64);" +
            "\n" +
            " }\n" +
            "};\n" +
            "\n" +
        "xhr.send();\n"
        webView.configuration.userContentController.add(self, name: "myInterface")
        webView?.evaluateJavaScript(s, completionHandler: {(string,error) in
            print(error ?? "no error")
        })
    }
    func setupWebView(){
        webView = WKWebView.init(frame: CGRect(x: 0, y: 0, width: webViewParentView.frame.width, height: webViewParentView.frame.height))
        webView.navigationDelegate = self
        webViewParentView.addSubview(webView)
        activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .gray)
        activityIndicator?.center = self.view.center
        self.view.addSubview(activityIndicator!)
        webView.load(URLRequest(url: URL(string: "https://codingexceptions.com/wkwebview/index.php")!))
        activityIndicator?.startAnimating()
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        btnPDF.addTarget(self, action: #selector(self.didSelect(_:)), for: .touchUpInside)

    }
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
         setupWebView()
    }
}
extension ViewController: WKScriptMessageHandler{
    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
         print("Message received: \(message.name) with body: \(message.body)")
    }
}
extension ViewController: WKNavigationDelegate{
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        self.activityIndicator?.stopAnimating()
        self.activityIndicator?.removeFromSuperview()
        self.activityIndicator = nil
    }
}

: embed, @Tarun

s url xhr.open

var url = document.getElementById("plugin").src

Answer 2

PS: ,

JavaScript -

path = document.getElementById("plugin").src

fetch(path).then(function (response) {
    response.body.getReader().read().then(function(result) {
        return btoa(String.fromCharCode.apply(null, result.value));
    }).then(function(b64) {
        window.pdf_data = b64;
    });
});

window.pdf_data, , javascript ?

Answer 3

Do you want to download PDF to your iPhone or to your Mac? It’s usually not possible to download PDF files directly to your iPhone because the iPhone does not have the ability to store PDF files. You will need to have iBooks or iCloud Drive, and then open the PDF in another window, and then manually download it. Before downloading a PDF document, it will still require user interaction, that is, the user will need to approve the download. Direct loading via JavaScript injection into the instance is WKWebViewnot possible.