PDF links on Android in Titanium

example usage

var wv = Ti.UI.createWebView();
var pdf = require('pdf');
wv.addEventListener('pdf', function (event) {
  pdf(event.url, event.cookies, function (err) {
    if (err) alert(err);
  });
});

pdf.js

// Checks to see if a file exists
function exists (file) {
  try {
    if (file.exists()) {
      return true;
    }
  } catch (e) {
    console.log(e);
  }

  return false;
}

// Checks if a file is a pdf by reading it and checking magic word
function isPdf (file) {
  try {
    // read first 4 bytes and check if its equal to %PDF
    
    var blob = file.read();

    if (!blob) return false;

    // sometimes its a blob, sometimes its text already.
    if (!blob.slice) blob = blob.text;

    if (!blob) return false;

    console.log("first few characters of pdf file: " + blob.slice(0, 5));

    if (blob.indexOf("%PDF") === 0) return true;

  } catch (e) {
    console.log(e);
  }

  return false;
}

// Downloads a pdf 
function download (url, cookies, done) {
  var base = Ti.Utils.md5HexDigest(url) + '.pdf';
  var file = Ti.Filesystem.getFile(
    Ti.Filesystem.applicationDataDirectory, 
    base
  );

  if (exists(file) && isPdf(file)) {
    console.log("File already exists and is pdf, returning");
    return done(null, file, base, url);
  }

  // Download pdf file
  var client = Ti.Network.createHTTPClient();
  client.onload = function (e) {
    try {
      // reopen the file, because otherwise the app will segfault, no really.
      var base = Ti.Utils.md5HexDigest(url) + '.pdf';
      var file = Ti.Filesystem.getFile(
        Ti.Filesystem.applicationDataDirectory, 
        base
      );
      if (e.source.status != 200)
        throw new Error("http status " + e.source.status);
      file.write(e.source.responseData);
      return done(null, file, base, url);
    } catch (e) {
      return done(e);
    } 
  };

  client.onerror = function (e) {
    console.log("http error " + e.source.status);
    return done(e);
  };

  client.setRequestHeader("Cookie", cookies);

  client.open("GET", url);
  client.send();
  return client;
}

// copies srcFile to a temp dir / filename.pdf
function copyToTemp (srcFile, base, url) {
  // create temp directory (with md5 hash as dirname) and put file in there.
  // This is so that the name of the file (on the server) can be the same
  // as the name of the file on the device tha we're about to write so the
  // filename shows up properly in whatever reader the user is using. 
  // Otherwise it'd be some hex string (ie, the md5 hash as filename

  var tempdir = Ti.Filesystem.getFile(Ti.Filesystem.tempDirectory, base);
  tempdir.createDirectory();

  var filename = url.split('/');
  filename = filename[filename.length - 1];

  var tempFile = Ti.Filesystem.getFile(Ti.Filesystem.tempDirectory, base, filename);

  tempFile.write(srcFile.read());

  return tempFile;
}

// launch intent to read pdf
function launch (file) {
  console.log("launching pdf path: " + file.getNativePath());
  var intent = Ti.Android.createIntent({
    action: Ti.Android.ACTION_VIEW,
    data: file.getNativePath(),
    type: "application/pdf"
  });
  Ti.Android.currentActivity.startActivity(intent);
}

// do whole thing -- download url w/ cookies and launch pdf
function pdf (url, cookies, done) {
  if (!Ti.Filesystem.isExternalStoragePresent()) {
    // TODO: display error
    return done(new Error("external"));
  }

  download(url, cookies, function (err, file, base, url) {
    if (err) return done(err);

    var tempFile = copyToTemp(file, base, url);
    launch(tempFile);
    done();
  });
}

module.exports = pdf;

sdk source diff

diff --git a/android/modules/ui/src/java/ti/modules/titanium/ui/widget/webview/TiWebViewClient.java b/android/modules/ui/src/java/ti/modules/titanium/ui/widget/webview/TiWebViewClient.java
index 99f8031..adb6bc9 100644
--- a/android/modules/ui/src/java/ti/modules/titanium/ui/widget/webview/TiWebViewClient.java
+++ b/android/modules/ui/src/java/ti/modules/titanium/ui/widget/webview/TiWebViewClient.java
@@ -22,6 +22,7 @@ import android.webkit.SslErrorHandler;
 import android.webkit.URLUtil;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
+import android.webkit.CookieManager;
 
 public class TiWebViewClient extends WebViewClient
 {
@@ -117,7 +118,18 @@ public class TiWebViewClient extends WebViewClient
                        Intent geoviewer = Intent.createChooser(new Intent(Intent.ACTION_VIEW, Uri.parse(url)), "Choose Viewer");
                        webView.getProxy().getActivity().startActivity(geoviewer);
                        return true;
-               } else {
+               } 
+
+                       else if (url.endsWith(".pdf")) {
+                       KrollDict data = new KrollDict();
+                       data.put("url", url);
+                       data.put("cookies", CookieManager.getInstance().getCookie(url));
+
+                       webView.getProxy().fireEvent("pdf", data);
+                       return true;
+               }
+
+               else {
                        String extension = MimeTypeMap.getFileExtensionFromUrl(url);
                        String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
                        if (mimeType != null) {