javascript - Download embedded PDF loaded in WKWebView

Question

While loading HTML5 page from url I'm getting pdf somewhere in that page and I have to download that pdf or save it as base64.

This is where the pdf is in the HTML code. I cannot simply hit the 'src' URL 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 which can help me get base64 string of that or any other method to download?

Answer 1

This question asked sometimes back, But if someone looking for swift solution with WKWebView to download .pdf or any file on File manager, this is how I ended-up

class WebPortalVC: UIViewController, WKNavigationDelegate,WKUIDelegate, UIDocumentInteractionControllerDelegate,URLSessionDownloadDelegate {

override following function, that will intercept url, in our case we check ulr ending with .pdf and .csv and redirect to open with file manger view. which enable view file, download and save on device storage, airdrop or share with other apps

just add following functions and check.

 func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
    if let url = navigationAction.request.url {

        print("fileDownload: check ::  (url)")

        let extention = "(url)".suffix(4)

        if extention == ".pdf" ||  extention == ".csv"{
            print("fileDownload: redirect to download events. (extention)")
            DispatchQueue.main.async {
                self.downloadPDF(tempUrl: "(url)")
            }
            decisionHandler(.cancel)
            return
        }

    }

    decisionHandler(.allow)
}

func downloadPDF(tempUrl:String){
    print("fileDownload: downloadPDF")
    guard let url = URL(string: tempUrl) else { return }
    let urlSession = URLSession(configuration: .default, delegate: self, delegateQueue: OperationQueue())
    let downloadTask = urlSession.downloadTask(with: url)
    downloadTask.resume()
    //showHUD(isShowBackground: true); //show progress if you need
}
func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController {
    print("fileDownload: documentInteractionControllerViewControllerForPreview")
    return self
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
    // create destination URL with the original pdf name
    print("fileDownload: urlSession")
    guard let url = downloadTask.originalRequest?.url else { return }
    print("fileDownload: urlSession (url)")
    let documentsPath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
    let destinationURL = documentsPath.appendingPathComponent(url.lastPathComponent)
    // delete original copy
    try? FileManager.default.removeItem(at: destinationURL)
    // copy from temp to Document
    do {
        try FileManager.default.copyItem(at: location, to: destinationURL)
        myViewDocumentsmethod(PdfUrl:destinationURL)
        print("fileDownload: downloadLocation", destinationURL)
        DispatchQueue.main.async {
            NBMaterialToast.showWithText(self.view, text: "Download Completed", duration: NBLunchDuration.long)
        }
    } catch let error {
        print("fileDownload: error (error.localizedDescription)")
    }
   // dismissHUD(isAnimated: false); //dismiss progress
}
func myViewDocumentsmethod(PdfUrl:URL){
    print("fileDownload: myViewDocumentsmethod (PdfUrl)")
    DispatchQueue.main.async {
        let controladorDoc = UIDocumentInteractionController(url: PdfUrl)
        controladorDoc.delegate = self
        controladorDoc.presentPreview(animated: true)
    }
}