From 90daf3069cc3876fe13a43c5d486da1ada7a2409 Mon Sep 17 00:00:00 2001
From: Austin Huang <im@austinhuang.me>
Date: Sun, 2 Aug 2020 10:41:59 -0400
Subject: [PATCH] foundation for signing capabilities

---
 .../java/awais/instagrabber/InstaApp.java     |  3 --
 .../java/awais/instagrabber/MainHelper.java   |  4 +-
 .../asyncs/StoryStatusFetcher.java            |  1 -
 .../awais/instagrabber/utils/Constants.java   | 12 +++++-
 .../java/awais/instagrabber/utils/Utils.java  | 39 ++++++++++++-------
 5 files changed, 37 insertions(+), 22 deletions(-)

diff --git a/app/src/main/java/awais/instagrabber/InstaApp.java b/app/src/main/java/awais/instagrabber/InstaApp.java
index 9d9f67fe..64f12df6 100755
--- a/app/src/main/java/awais/instagrabber/InstaApp.java
+++ b/app/src/main/java/awais/instagrabber/InstaApp.java
@@ -22,8 +22,6 @@ import static awais.instagrabber.utils.Utils.clipboardManager;
 import static awais.instagrabber.utils.Utils.dataBox;
 import static awais.instagrabber.utils.Utils.datetimeParser;
 import static awais.instagrabber.utils.Utils.getInstalledTelegramPackage;
-import static awais.instagrabber.utils.Utils.isInstaInstalled;
-import static awais.instagrabber.utils.Utils.isInstagramInstalled;
 import static awais.instagrabber.utils.Utils.logCollector;
 import static awais.instagrabber.utils.Utils.notificationManager;
 import static awais.instagrabber.utils.Utils.settingsHelper;
@@ -41,7 +39,6 @@ public final class InstaApp extends MultiDexApplication {
 
         final Context appContext = getApplicationContext();
 
-        isInstagramInstalled = isInstaInstalled(appContext);
         telegramPackage = getInstalledTelegramPackage(appContext);
 
         if (dataBox == null)
diff --git a/app/src/main/java/awais/instagrabber/MainHelper.java b/app/src/main/java/awais/instagrabber/MainHelper.java
index 501852c6..914c4132 100755
--- a/app/src/main/java/awais/instagrabber/MainHelper.java
+++ b/app/src/main/java/awais/instagrabber/MainHelper.java
@@ -1205,11 +1205,11 @@ public final class MainHelper implements SwipeRefreshLayout.OnRefreshListener {
             if (!isLoggedIn && Utils.dataBox.getFavorite(main.userQuery) != null && v == main.mainBinding.btnFollow) {
                 Utils.dataBox.delFavorite(new DataBox.FavoriteModel(main.userQuery,
                         Long.parseLong(Utils.dataBox.getFavorite(main.userQuery).split("/")[1]),
-                        main.locationModel != null ? main.locationModel.getName() : main.userQuery));
+                        main.locationModel != null ? main.locationModel.getName() : main.userQuery.replaceAll("^@", "")));
                 onRefresh();
             } else if (!isLoggedIn && v == main.mainBinding.btnFollow) {
                 Utils.dataBox.addFavorite(new DataBox.FavoriteModel(main.userQuery, System.currentTimeMillis(),
-                        main.locationModel != null ? main.locationModel.getName() : main.userQuery));
+                        main.locationModel != null ? main.locationModel.getName() : main.userQuery.replaceAll("^@", "")));
                 onRefresh();
             } else if (v == main.mainBinding.btnFollow) {
                 new ProfileAction().execute("follow");
diff --git a/app/src/main/java/awais/instagrabber/asyncs/StoryStatusFetcher.java b/app/src/main/java/awais/instagrabber/asyncs/StoryStatusFetcher.java
index 2929c67a..b9e6cb52 100755
--- a/app/src/main/java/awais/instagrabber/asyncs/StoryStatusFetcher.java
+++ b/app/src/main/java/awais/instagrabber/asyncs/StoryStatusFetcher.java
@@ -83,7 +83,6 @@ public final class StoryStatusFetcher extends AsyncTask<Void, Void, StoryModel[]
                                 models[i].setTappableShortCode(tappableObject.getJSONObject("media").getString(Constants.EXTRAS_SHORTCODE));
                             }
                             else if (tappableObject.optString("__typename").equals("GraphTappableStoryPoll")) {
-                                Log.d("austin_debug", "poll: "+url+" "+tappableObject);
                                 models[i].setPoll(new PollModel(
                                         tappableObject.getString("id"),
                                         tappableObject.getString("question"),
diff --git a/app/src/main/java/awais/instagrabber/utils/Constants.java b/app/src/main/java/awais/instagrabber/utils/Constants.java
index e4e86d8b..d79441bd 100755
--- a/app/src/main/java/awais/instagrabber/utils/Constants.java
+++ b/app/src/main/java/awais/instagrabber/utils/Constants.java
@@ -41,8 +41,18 @@ public final class Constants {
     public static final String EXTRAS_END_CURSOR = "endCursor";
     public static final String FEED = "feed";
     public static final String FEED_ORDER = "feedOrder";
-    //////////////////////// EXTRAS ////////////////////////
+    // spoof
     public static final String USER_AGENT = "Mozilla/5.0 (Linux; Android 8.1.0; motorola one Build/OPKS28.63-18-3; wv) " +
             "AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.80 Mobile Safari/537.36 " +
             "Instagram 72.0.0.21.98 Android (27/8.1.0; 320dpi; 720x1362; motorola; motorola one; deen_sprout; qcom; pt_BR; 132081645)";
+    // see https://github.com/dilame/instagram-private-api/blob/master/src/core/constants.ts
+    public static final String SUPPORTED_CAPABILITIES = "[ { \"name\": \"SUPPORTED_SDK_VERSIONS\", \"value\":" +
+            " \"13.0,14.0,15.0,16.0,17.0,18.0,19.0,20.0,21.0,22.0,23.0,24.0,25.0,26.0,27.0,28.0,29.0,30.0,31.0," +
+            "32.0,33.0,34.0,35.0,36.0,37.0,38.0,39.0,40.0,41.0,42.0,43.0,44.0,45.0,46.0,47.0,48.0,49.0,50.0,51.0," +
+            "52.0,53.0,54.0,55.0,56.0,57.0,58.0,59.0,60.0,61.0,62.0,63.0,64.0,65.0,66.0\" }, { \"name\": \"FACE_TRACKER_VERSION\", " +
+            "\"value\": 12 }, { \"name\": \"segmentation\", \"value\": \"segmentation_enabled\" }, { \"name\": \"COMPRESSION\", " +
+            "\"value\": \"ETC2_COMPRESSION\" }, { \"name\": \"world_tracker\", \"value\": \"world_tracker_enabled\" }, { \"name\": " +
+            "\"gyroscope\", \"value\": \"gyroscope_enabled\" } ]";
+    public static final String SIGNATURE_VERSION = "4";
+    public static final String SIGNATURE_KEY = "9193488027538fd3450b83b7d05286d4ca9599a0f7eeed90d8c85925698a05dc";
 }
\ No newline at end of file
diff --git a/app/src/main/java/awais/instagrabber/utils/Utils.java b/app/src/main/java/awais/instagrabber/utils/Utils.java
index eb0dfb04..6a8cb22f 100755
--- a/app/src/main/java/awais/instagrabber/utils/Utils.java
+++ b/app/src/main/java/awais/instagrabber/utils/Utils.java
@@ -53,12 +53,16 @@ import java.net.HttpCookie;
 import java.net.HttpURLConnection;
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.security.MessageDigest;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;
 import java.util.regex.Pattern;
 
+import javax.crypto.Mac;
+import javax.crypto.spec.SecretKeySpec;
+
 import awais.instagrabber.BuildConfig;
 import awais.instagrabber.R;
 import awais.instagrabber.activities.Main;
@@ -113,7 +117,6 @@ public final class Utils {
     public static final String CHANNEL_ID = "InstaGrabber", CHANNEL_NAME = "Instagrabber",
             NOTIF_GROUP_NAME = "awais.instagrabber.InstaNotif";
     public static boolean isChannelCreated = false;
-    public static boolean isInstagramInstalled = false;
     public static String telegramPackage;
     public static ClipboardManager clipboardManager;
     public static DisplayMetrics displayMetrics = Resources.getSystem().getDisplayMetrics();
@@ -1223,6 +1226,26 @@ public final class Utils {
         }
     }
 
+    public static String sign(final String message) {
+        try {
+            Mac hasher = Mac.getInstance("HmacSHA256");
+            hasher.init(new SecretKeySpec(Constants.SIGNATURE_KEY.getBytes(), "HmacSHA256"));
+            byte[] hash = hasher.doFinal(message.getBytes());
+            StringBuffer hexString = new StringBuffer();
+            for (int i = 0; i < hash.length; i++) {
+                String hex = Integer.toHexString(0xff & hash[i]);
+                if (hex.length() == 1) hexString.append('0');
+                hexString.append(hex);
+            }
+            Log.d("austin_debug", "hash: " + hexString.toString());
+            return hexString.toString() + "." + message;
+        }
+        catch (Throwable e) {
+            Log.e("austin_debug", "sign: ", e);
+            return null;
+        }
+    }
+
     public static CharSequence getSpannableUrl(final String url) {
         if (Utils.isEmpty(url)) return url;
         final int httpIndex = url.indexOf("http:");
@@ -1353,20 +1376,6 @@ public final class Utils {
         activity.finish();
     }
 
-    public static boolean isInstaInstalled(@NonNull final Context context) {
-        final PackageManager packageManager = context.getPackageManager();
-        try {
-            packageManager.getPackageInfo("com.instagram.android", 0);
-            return true;
-        } catch (final Exception e) {
-            try {
-                return packageManager.getApplicationInfo("com.instagram.android", 0).enabled;
-            } catch (final Exception e1) {
-                return false;
-            }
-        }
-    }
-
     @Nullable
     public static String getInstalledTelegramPackage(@NonNull final Context context) {
         final String[] packages = {