session-android/app/src/main/java/org/thoughtcrime/securesms/conversation/v2/Util.java

/*
 * Copyright (C) 2011 Whisper Systems
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.thoughtcrime.securesms.conversation.v2;

import android.annotation.TargetApi;
import android.app.ActivityManager;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.Context;
import android.graphics.Typeface;
import android.net.Uri;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.TextUtils;
import android.text.style.StyleSpan;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import com.annimon.stream.Stream;
import com.google.android.mms.pdu_alt.CharacterSets;
import com.google.android.mms.pdu_alt.EncodedStringValue;

import org.session.libsignal.utilities.Log;
import org.thoughtcrime.securesms.components.ComposeText;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import network.loki.messenger.R;

public class Util {
  private static final String TAG = Log.tag(Util.class);

  private static final long BUILD_LIFESPAN = TimeUnit.DAYS.toMillis(90);

  public static <T> List<T> asList(T... elements) {
    List<T> result = new LinkedList<>();
    Collections.addAll(result, elements);
    return result;
  }

  public static String join(String[] list, String delimiter) {
    return join(Arrays.asList(list), delimiter);
  }

  public static <T> String join(Collection<T> list, String delimiter) {
    StringBuilder result = new StringBuilder();
    int i = 0;

    for (T item : list) {
      result.append(item);

      if (++i < list.size())
        result.append(delimiter);
    }

    return result.toString();
  }

  public static String join(long[] list, String delimeter) {
    List<Long> boxed = new ArrayList<>(list.length);

    for (int i = 0; i < list.length; i++) {
      boxed.add(list[i]);
    }

    return join(boxed, delimeter);
  }

  @SafeVarargs
  public static @NonNull <E> List<E> join(@NonNull List<E>... lists) {
    int     totalSize = Stream.of(lists).reduce(0, (sum, list) -> sum + list.size());
    List<E> joined    = new ArrayList<>(totalSize);

    for (List<E> list : lists) {
      joined.addAll(list);
    }

    return joined;
  }

  public static String join(List<Long> list, String delimeter) {
    StringBuilder sb = new StringBuilder();

    for (int j = 0; j < list.size(); j++) {
      if (j != 0) sb.append(delimeter);
      sb.append(list.get(j));
    }

    return sb.toString();
  }

  public static String rightPad(String value, int length) {
    if (value.length() >= length) {
      return value;
    }

    StringBuilder out = new StringBuilder(value);
    while (out.length() < length) {
      out.append(" ");
    }

    return out.toString();
  }

  public static boolean isEmpty(EncodedStringValue[] value) {
    return value == null || value.length == 0;
  }

  public static boolean isEmpty(ComposeText value) {
    return value == null || value.getText() == null || TextUtils.isEmpty(value.getTextTrimmed());
  }

  public static boolean isEmpty(Collection<?> collection) {
    return collection == null || collection.isEmpty();
  }

  public static boolean isEmpty(@Nullable CharSequence charSequence) {
    return charSequence == null || charSequence.length() == 0;
  }

  public static boolean hasItems(@Nullable Collection<?> collection) {
    return collection != null && !collection.isEmpty();
  }

  public static <K, V> V getOrDefault(@NonNull Map<K, V> map, K key, V defaultValue) {
    return map.containsKey(key) ? map.get(key) : defaultValue;
  }

  public static String getFirstNonEmpty(String... values) {
    for (String value : values) {
      if (!Util.isEmpty(value)) {
        return value;
      }
    }
    return "";
  }

  public static @NonNull String emptyIfNull(@Nullable String value) {
    return value != null ? value : "";
  }

  public static @NonNull CharSequence emptyIfNull(@Nullable CharSequence value) {
    return value != null ? value : "";
  }

  public static CharSequence getBoldedString(String value) {
    SpannableString spanned = new SpannableString(value);
    spanned.setSpan(new StyleSpan(Typeface.BOLD), 0,
                    spanned.length(),
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

    return spanned;
  }

  public static @NonNull String toIsoString(byte[] bytes) {
    try {
      return new String(bytes, CharacterSets.MIMENAME_ISO_8859_1);
    } catch (UnsupportedEncodingException e) {
      throw new AssertionError("ISO_8859_1 must be supported!");
    }
  }

  public static byte[] toIsoBytes(String isoString) {
    try {
      return isoString.getBytes(CharacterSets.MIMENAME_ISO_8859_1);
    } catch (UnsupportedEncodingException e) {
      throw new AssertionError("ISO_8859_1 must be supported!");
    }
  }

  public static byte[] toUtf8Bytes(String utf8String) {
    try {
      return utf8String.getBytes(CharacterSets.MIMENAME_UTF_8);
    } catch (UnsupportedEncodingException e) {
      throw new AssertionError("UTF_8 must be supported!");
    }
  }

  public static void wait(Object lock, long timeout) {
    try {
      lock.wait(timeout);
    } catch (InterruptedException ie) {
      throw new AssertionError(ie);
    }
  }

  public static List<String> split(String source, String delimiter) {
    List<String> results = new LinkedList<>();

    if (TextUtils.isEmpty(source)) {
      return results;
    }

    String[] elements = source.split(delimiter);
    Collections.addAll(results, elements);

    return results;
  }

  public static byte[][] split(byte[] input, int firstLength, int secondLength) {
    byte[][] parts = new byte[2][];

    parts[0] = new byte[firstLength];
    System.arraycopy(input, 0, parts[0], 0, firstLength);

    parts[1] = new byte[secondLength];
    System.arraycopy(input, firstLength, parts[1], 0, secondLength);

    return parts;
  }

  public static byte[] combine(byte[]... elements) {
    try {
      ByteArrayOutputStream baos = new ByteArrayOutputStream();

      for (byte[] element : elements) {
        baos.write(element);
      }

      return baos.toByteArray();
    } catch (IOException e) {
      throw new AssertionError(e);
    }
  }

  public static byte[] trim(byte[] input, int length) {
    byte[] result = new byte[length];
    System.arraycopy(input, 0, result, 0, result.length);

    return result;
  }

  public static byte[] getSecretBytes(int size) {
    return getSecretBytes(new SecureRandom(), size);
  }

  public static byte[] getSecretBytes(@NonNull SecureRandom secureRandom, int size) {
    byte[] secret = new byte[size];
    secureRandom.nextBytes(secret);
    return secret;
  }

  public static <T> T getRandomElement(T[] elements) {
    return elements[new SecureRandom().nextInt(elements.length)];
  }

  public static <T> T getRandomElement(List<T> elements) {
    return elements.get(new SecureRandom().nextInt(elements.size()));
  }

  public static boolean equals(@Nullable Object a, @Nullable Object b) {
    return a == b || (a != null && a.equals(b));
  }

  public static int hashCode(@Nullable Object... objects) {
    return Arrays.hashCode(objects);
  }

  public static @Nullable Uri uri(@Nullable String uri) {
    if (uri == null) return null;
    else             return Uri.parse(uri);
  }

  @TargetApi(VERSION_CODES.KITKAT)
  public static boolean isLowMemory(Context context) {
    ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);

    return (VERSION.SDK_INT >= VERSION_CODES.KITKAT && activityManager.isLowRamDevice()) ||
           activityManager.getLargeMemoryClass() <= 64;
  }

  public static int clamp(int value, int min, int max) {
    return Math.min(Math.max(value, min), max);
  }

  public static long clamp(long value, long min, long max) {
    return Math.min(Math.max(value, min), max);
  }

  public static float clamp(float value, float min, float max) {
    return Math.min(Math.max(value, min), max);
  }

  /**
   * Returns half of the difference between the given length, and the length when scaled by the
   * given scale.
   */
  public static float halfOffsetFromScale(int length, float scale) {
    float scaledLength = length * scale;
    return (length - scaledLength) / 2;
  }

  public static @Nullable String readTextFromClipboard(@NonNull Context context) {
    {
      ClipboardManager clipboardManager = (ClipboardManager)context.getSystemService(Context.CLIPBOARD_SERVICE);

      if (clipboardManager.hasPrimaryClip() && clipboardManager.getPrimaryClip().getItemCount() > 0) {
        return clipboardManager.getPrimaryClip().getItemAt(0).getText().toString();
      } else {
        return null;
      }
    }
  }

  public static void writeTextToClipboard(@NonNull Context context, @NonNull String text) {
    writeTextToClipboard(context, context.getString(R.string.app_name), text);
  }

  public static void writeTextToClipboard(@NonNull Context context, @NonNull String label, @NonNull String text) {
    ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
    ClipData clip = ClipData.newPlainText(label, text);
    clipboard.setPrimaryClip(clip);
  }

  public static int toIntExact(long value) {
    if ((int)value != value) {
      throw new ArithmeticException("integer overflow");
    }
    return (int)value;
  }

  public static boolean isEquals(@Nullable Long first, long second) {
    return first != null && first == second;
  }

  @SafeVarargs
  public static <T> List<T> concatenatedList(Collection <T>... items) {
    final List<T> concat = new ArrayList<>(Stream.of(items).reduce(0, (sum, list) -> sum + list.size()));

    for (Collection<T> list : items) {
      concat.addAll(list);
    }

    return concat;
  }

  public static boolean isLong(String value) {
    try {
      Long.parseLong(value);
      return true;
    } catch (NumberFormatException e) {
      return false;
    }
  }

  public static int parseInt(String integer, int defaultValue) {
    try {
      return Integer.parseInt(integer);
    } catch (NumberFormatException e) {
      return defaultValue;
    }
  }
}