src/com/android/email/activity/ComposeActivityEmailExternal.java

/**
 * Copyright (C) 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.email.activity;

import android.content.Intent;
import android.os.Bundle;
import androidx.annotation.Nullable;
import com.android.mail.compose.ComposeActivity;

/**
 * A subclass of {@link ComposeActivityEmail} which is exported for other Android packages to open.
 */
public class ComposeActivityEmailExternal extends ComposeActivityEmail {

  @Override
  protected void onCreate(@Nullable Bundle savedInstanceState) {
    sanitizeIntent();
    super.onCreate(savedInstanceState);
  }

  /**
   * Only relevant when WebView Compose is enabled. Change this when WebView
   * Compose is enabled for Email.
   */
  @Override
  public boolean isExternal() {
      return false;
  }

  /**
   * Overrides the value of {@code #getIntent()} so any future callers will get a sanitized version
   * of the intent.
   */
  // See b/114493057 for context.
  private void sanitizeIntent() {
    Intent sanitizedIntent = getIntent();
    if (sanitizedIntent != null) {
      Bundle originalExtras = sanitizedIntent.getExtras();
       if (originalExtras == null) {
        originalExtras = new Bundle();
      }
      sanitizedIntent.replaceExtras(new Bundle());
      copyStringExtraIfExists(ComposeActivity.EXTRA_SUBJECT, originalExtras, sanitizedIntent);
      copyStringExtraIfExists(ComposeActivity.EXTRA_TO, originalExtras, sanitizedIntent);
      copyStringExtraIfExists(ComposeActivity.EXTRA_CC, originalExtras, sanitizedIntent);
      copyStringExtraIfExists(ComposeActivity.EXTRA_BCC, originalExtras, sanitizedIntent);
      copyStringExtraIfExists(ComposeActivity.EXTRA_BODY, originalExtras, sanitizedIntent);
      setIntent(sanitizedIntent);
    }
  }

  private void copyStringExtraIfExists(
      String extraKey, Bundle originalExtras, Intent sanitizedIntent) {
    if (originalExtras.containsKey(extraKey)) {
      sanitizedIntent.putExtra(extraKey, originalExtras.getString(extraKey));
    }
  }
}