+/*
+ * Copyright © 2020 Soren Stoutner <soren@stoutner.com>.
+ *
+ * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
+ *
+ * Privacy Browser is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Privacy Browser is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Privacy Browser. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.stoutner.privacybrowser.asynctasks;
+
+import android.app.Activity;
+import android.content.Context;
+import android.net.Uri;
+import android.os.AsyncTask;
+import android.webkit.CookieManager;
+
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.FragmentManager;
+
+import com.stoutner.privacybrowser.R;
+import com.stoutner.privacybrowser.dialogs.SaveDialog;
+import com.stoutner.privacybrowser.helpers.ProxyHelper;
+
+import java.lang.ref.WeakReference;
+import java.net.HttpURLConnection;
+import java.net.Proxy;
+import java.net.URL;
+import java.text.NumberFormat;
+
+public class PrepareSaveDialog extends AsyncTask<String, Void, String[]> {
+ // Define weak references.
+ private WeakReference<Activity> activityWeakReference;
+ private WeakReference<Context> contextWeakReference;
+ private WeakReference<FragmentManager> fragmentManagerWeakReference;
+
+ // Define the class variables.
+ private int saveType;
+ private String userAgent;
+ private boolean cookiesEnabled;
+ private String urlString;
+
+ // The public constructor.
+ public PrepareSaveDialog(Activity activity, Context context, FragmentManager fragmentManager, int saveType, String userAgent, boolean cookiesEnabled) {
+ // Populate the weak references.
+ activityWeakReference = new WeakReference<>(activity);
+ contextWeakReference = new WeakReference<>(context);
+ fragmentManagerWeakReference = new WeakReference<>(fragmentManager);
+
+ // Store the class variables.
+ this.saveType = saveType;
+ this.userAgent = userAgent;
+ this.cookiesEnabled = cookiesEnabled;
+ }
+
+ @Override
+ protected String[] doInBackground(String... urlToSave) {
+ // Get a handle for the activity and context.
+ Activity activity = activityWeakReference.get();
+ Context context = contextWeakReference.get();
+
+ // Abort if the activity is gone.
+ if (activity == null || activity.isFinishing()) {
+ // Return a null string array.
+ return null;
+ }
+
+ // Get the URL string.
+ urlString = urlToSave[0];
+
+ // Define the file name string.
+ String fileNameString;
+
+ // Initialize the formatted file size string.
+ String formattedFileSize = context.getString(R.string.unknown_size);
+
+ // Because everything relating to requesting data from a webserver can throw errors, the entire section must catch exceptions.
+ try {
+ // Convert the URL string to a URL.
+ URL url = new URL(urlString);
+
+ // Instantiate the proxy helper.
+ ProxyHelper proxyHelper = new ProxyHelper();
+
+ // Get the current proxy.
+ Proxy proxy = proxyHelper.getCurrentProxy(context);
+
+ // Open a connection to the URL. No data is actually sent at this point.
+ HttpURLConnection httpUrlConnection = (HttpURLConnection) url.openConnection(proxy);
+
+ // Add the user agent to the header property.
+ httpUrlConnection.setRequestProperty("User-Agent", userAgent);
+
+ // Add the cookies if they are enabled.
+ if (cookiesEnabled) {
+ // Get the cookies for the current domain.
+ String cookiesString = CookieManager.getInstance().getCookie(url.toString());
+
+ // only add the cookies if they are not null.
+ if (cookiesString != null) {
+ // Add the cookies to the header property.
+ httpUrlConnection.setRequestProperty("Cookie", cookiesString);
+ }
+ }
+
+ // The actual network request is in a `try` bracket so that `disconnect()` is run in the `finally` section even if an error is encountered in the main block.
+ try {
+ // Get the status code. This initiates a network connection.
+ int responseCode = httpUrlConnection.getResponseCode();
+
+ // Check the response code.
+ if (responseCode >= 400) { // The response code is an error message.
+ // Set the formatted file size to indicate a bad URL.
+ formattedFileSize = context.getString(R.string.invalid_url);
+
+ // Set the file name according to the URL.
+ fileNameString = getFileNameFromUrl(context, urlString);
+ } else { // The response code is not an error message.
+ // Get the content length and disposition headers.
+ String contentLengthString = httpUrlConnection.getHeaderField("Content-Length");
+ String contentDispositionString = httpUrlConnection.getHeaderField("Content-Disposition");
+
+ // Only process the content length string if it isn't null.
+ if (contentLengthString != null) {
+ // Convert the content length string to a long.
+ long fileSize = Long.parseLong(contentLengthString);
+
+ // Format the file size.
+ formattedFileSize = NumberFormat.getInstance().format(fileSize) + " " + context.getString(R.string.bytes);
+ }
+
+ // Get the file name string from the content disposition.
+ fileNameString = getFileNameFromContentDisposition(context, contentDispositionString, urlString);
+ }
+ } finally {
+ // Disconnect the HTTP URL connection.
+ httpUrlConnection.disconnect();
+ }
+ } catch (Exception exception) {
+ // Set the formatted file size to indicate a bad URL.
+ formattedFileSize = context.getString(R.string.invalid_url);
+
+ // Set the file name according to the URL.
+ fileNameString = getFileNameFromUrl(context, urlString);
+ }
+
+ // Return the formatted file size and name as a string array.
+ return new String[] {formattedFileSize, fileNameString};
+ }
+
+ // `onPostExecute()` operates on the UI thread.
+ @Override
+ protected void onPostExecute(String[] fileStringArray) {
+ // Get a handle for the activity and the fragment manager.
+ Activity activity = activityWeakReference.get();
+ FragmentManager fragmentManager = fragmentManagerWeakReference.get();
+
+ // Abort if the activity is gone.
+ if (activity == null || activity.isFinishing()) {
+ // Exit.
+ return;
+ }
+
+ // Instantiate the save dialog.
+ DialogFragment saveDialogFragment = SaveDialog.saveUrl(saveType, urlString, fileStringArray[0], fileStringArray[1], userAgent, cookiesEnabled);
+
+ // Show the save dialog. It must be named `save_dialog` so that the file picker can update the file name.
+ saveDialogFragment.show(fragmentManager, activity.getString(R.string.save_dialog));
+ }
+
+ // Content dispositions can contain other text besides the file name, and they can be in any order.
+ // Elements are separated by semicolons. Sometimes the file names are contained in quotes.
+ public static String getFileNameFromContentDisposition(Context context, String contentDispositionString, String urlString) {
+ // Define a file name string.
+ String fileNameString;
+
+ // Only process the content disposition string if it isn't null.
+ if (contentDispositionString != null) { // The content disposition is not null.
+ // Check to see if the content disposition contains a file name.
+ if (contentDispositionString.contains("filename=")) { // The content disposition contains a filename.
+ // Get the part of the content disposition after `filename=`.
+ fileNameString = contentDispositionString.substring(contentDispositionString.indexOf("filename=") + 9);
+
+ // Remove any `;` and anything after it. This removes any entries after the filename.
+ if (fileNameString.contains(";")) {
+ // Remove the first `;` and everything after it.
+ fileNameString = fileNameString.substring(0, fileNameString.indexOf(";") - 1);
+ }
+
+ // Remove any `"` at the beginning of the string.
+ if (fileNameString.startsWith("\"")) {
+ // Remove the first character.
+ fileNameString = fileNameString.substring(1);
+ }
+
+ // Remove any `"` at the end of the string.
+ if (fileNameString.endsWith("\"")) {
+ // Remove the last character.
+ fileNameString = fileNameString.substring(0, fileNameString.length() - 1);
+ }
+ } else { // The content disposition does not contain a filename.
+ // Get the file name string from the URL.
+ fileNameString = getFileNameFromUrl(context, urlString);
+ }
+ } else { // The content disposition is null.
+ // Get the file name string from the URL.
+ fileNameString = getFileNameFromUrl(context, urlString);
+ }
+
+ // Return the file name string.
+ return fileNameString;
+ }
+
+ private static String getFileNameFromUrl(Context context, String urlString) {
+ // Convert the URL string to a URI.
+ Uri uri = Uri.parse(urlString);
+
+ // Get the last path segment.
+ String lastPathSegment = uri.getLastPathSegment();
+
+ // Use a default file name if the last path segment is null.
+ if (lastPathSegment == null) {
+ lastPathSegment = context.getString(R.string.file);
+ }
+
+ // Return the last path segment as the file name.
+ return lastPathSegment;
+ }
+}
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projects / PrivacyBrowserAndroid.git / commitdiff