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[PrivacyBrowserAndroid.git] / app / src / main / java / com / stoutner / privacybrowser / asynctasks / GetHostIpAddresses.java

diff --git a/app/src/main/java/com/stoutner/privacybrowser/asynctasks/GetHostIpAddresses.java b/app/src/main/java/com/stoutner/privacybrowser/asynctasks/GetHostIpAddresses.java
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+++ b/app/src/main/java/com/stoutner/privacybrowser/asynctasks/GetHostIpAddresses.java
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+/*
+ * Copyright © 2019 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.os.AsyncTask;
+
+import com.stoutner.privacybrowser.activities.MainWebViewActivity;
+
+import java.lang.ref.WeakReference;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+// This must run asynchronously because it involves a network request.  `String` declares the parameters.  `Void` does not declare progress units.  `String` contains the results.
+public class GetHostIpAddresses extends AsyncTask<String, Void, String> {
+    // The weak references are used to determine if the activity have disappeared while the AsyncTask is running.
+    private final WeakReference<Activity> activityWeakReference;
+    private final int domainSettingsDatabaseId;
+
+    public GetHostIpAddresses(Activity activity, int domainSettingsDatabaseId) {
+        // Populate the weak activity reference.
+        activityWeakReference = new WeakReference<>(activity);
+
+        // Populate the domain settings database ID.
+        this.domainSettingsDatabaseId = domainSettingsDatabaseId;
+    }
+
+    // `onPreExecute()` operates on the UI thread.
+    @Override
+    protected void onPreExecute() {
+        // Get a handle for the activity.
+        Activity activity = activityWeakReference.get();
+
+        // Abort if the activity is gone.
+        if ((activity == null) || activity.isFinishing()) {
+            return;
+        }
+
+        // Set the getting IP addresses tracker.
+        MainWebViewActivity.gettingIpAddresses = true;
+    }
+
+
+    @Override
+    protected String doInBackground(String... domainName) {
+        // Get a handle for the activity.
+        Activity activity = activityWeakReference.get();
+
+        // Abort if the activity is gone.
+        if ((activity == null) || activity.isFinishing()) {
+            // Return an empty spannable string builder.
+            return "";
+        }
+
+        // Initialize an IP address string builder.
+        StringBuilder ipAddresses = new StringBuilder();
+
+        // Get an array with the IP addresses for the host.
+        try {
+            // Get an array with all the IP addresses for the domain.
+            InetAddress[] inetAddressesArray = InetAddress.getAllByName(domainName[0]);
+
+            // Add each IP address to the string builder.
+            for (InetAddress inetAddress : inetAddressesArray) {
+                if (ipAddresses.length() == 0) {  // This is the first IP address.
+                    // Add the IP address to the string builder.
+                    ipAddresses.append(inetAddress.getHostAddress());
+                } else {  // This is not the first IP address.
+                    // Add a line break to the string builder first.
+                    ipAddresses.append("\n");
+
+                    // Add the IP address to the string builder.
+                    ipAddresses.append(inetAddress.getHostAddress());
+                }
+            }
+        } catch (UnknownHostException exception) {
+            // Do nothing.
+        }
+
+        // Return the string.
+        return ipAddresses.toString();
+    }
+
+    // `onPostExecute()` operates on the UI thread.
+    @Override
+    protected void onPostExecute(String ipAddresses) {
+        // Get a handle for the activity.
+        Activity activity = activityWeakReference.get();
+
+        // Abort if the activity is gone.
+        if ((activity == null) || activity.isFinishing()) {
+            return;
+        }
+
+        // Store the IP addresses.
+        MainWebViewActivity.currentHostIpAddresses = ipAddresses;
+
+        if (!MainWebViewActivity.urlIsLoading) {
+            MainWebViewActivity.checkPinnedMismatch(domainSettingsDatabaseId);
+        }
+
+        // Reset the getting IP addresses tracker.
+        MainWebViewActivity.gettingIpAddresses = false;
+    }
+}
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