talk-android/app/src/main/java/com/nextcloud/talk/activities/BaseActivity.kt

/*
 * Nextcloud Talk application
 *
 * @author Mario Danic
 * Copyright (C) 2017-2018 Mario Danic <mario@lovelyhq.com>
 *
 * 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 com.nextcloud.talk.activities

import android.annotation.SuppressLint
import android.content.Context
import android.os.Build
import android.os.Bundle
import android.util.Log
import android.view.WindowManager
import android.webkit.SslErrorHandler
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity
import autodagger.AutoInjector
import com.google.android.material.dialog.MaterialAlertDialogBuilder
import com.nextcloud.talk.R
import com.nextcloud.talk.application.NextcloudTalkApplication
import com.nextcloud.talk.events.CertificateEvent
import com.nextcloud.talk.ui.theme.ViewThemeUtils
import com.nextcloud.talk.utils.SecurityUtils
import com.nextcloud.talk.utils.preferences.AppPreferences
import com.nextcloud.talk.utils.ssl.MagicTrustManager
import org.greenrobot.eventbus.EventBus
import org.greenrobot.eventbus.Subscribe
import org.greenrobot.eventbus.ThreadMode
import java.security.cert.CertificateParsingException
import java.security.cert.X509Certificate
import java.text.DateFormat
import javax.inject.Inject

@AutoInjector(NextcloudTalkApplication::class)
open class BaseActivity : AppCompatActivity() {

    @Inject
    lateinit var eventBus: EventBus

    @Inject
    lateinit var appPreferences: AppPreferences

    @Inject
    lateinit var viewThemeUtils: ViewThemeUtils

    @Inject
    lateinit var context: Context

    override fun onCreate(savedInstanceState: Bundle?) {
        NextcloudTalkApplication.sharedApplication!!.componentApplication.inject(this)
        super.onCreate(savedInstanceState)
    }

    public override fun onResume() {
        super.onResume()

        if (appPreferences.isScreenSecured) {
            window.addFlags(WindowManager.LayoutParams.FLAG_SECURE)
        } else {
            window.clearFlags(WindowManager.LayoutParams.FLAG_SECURE)
        }

        if (appPreferences.isScreenLocked) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                SecurityUtils.createKey(appPreferences.screenLockTimeout)
            }
        }
    }

    fun showCertificateDialog(
        cert: X509Certificate,
        magicTrustManager: MagicTrustManager,
        sslErrorHandler: SslErrorHandler?
    ) {
        val formatter = DateFormat.getDateInstance(DateFormat.LONG)
        val validFrom = formatter.format(cert.notBefore)
        val validUntil = formatter.format(cert.notAfter)

        val issuedBy = cert.issuerDN.toString()
        val issuedFor: String

        try {
            if (cert.subjectAlternativeNames != null) {
                val stringBuilder = StringBuilder()
                for (o in cert.subjectAlternativeNames) {
                    val list = o as List<*>
                    val type = list[0] as Int
                    if (type == 2) {
                        val name = list[1] as String
                        stringBuilder.append("[").append(type).append("]").append(name).append(" ")
                    }
                }
                issuedFor = stringBuilder.toString()
            } else {
                issuedFor = cert.subjectDN.name
            }

            @SuppressLint("StringFormatMatches") val dialogText = String.format(
                resources
                    .getString(R.string.nc_certificate_dialog_text),
                issuedBy, issuedFor, validFrom, validUntil
            )

            val dialogBuilder = MaterialAlertDialogBuilder(this)
                .setIcon(viewThemeUtils.colorMaterialAlertDialogIcon(context, R.drawable.ic_security_white_24dp))
                .setTitle(R.string.nc_certificate_dialog_title)
                .setMessage(dialogText)
                .setPositiveButton(R.string.nc_yes) { _, _ ->
                    magicTrustManager.addCertInTrustStore(cert)
                    sslErrorHandler?.proceed()
                }
                .setNegativeButton(R.string.nc_no) { _, _ ->
                    sslErrorHandler?.cancel()
                }

            viewThemeUtils.colorMaterialAlertDialogBackground(context, dialogBuilder)

            val dialog = dialogBuilder.show()

            viewThemeUtils.colorTextButtons(
                dialog.getButton(AlertDialog.BUTTON_POSITIVE),
                dialog.getButton(AlertDialog.BUTTON_NEGATIVE)
            )
        } catch (e: CertificateParsingException) {
            Log.d(TAG, "Failed to parse the certificate")
        }
    }

    @Subscribe(threadMode = ThreadMode.MAIN)
    fun onMessageEvent(event: CertificateEvent) {
        showCertificateDialog(event.x509Certificate, event.magicTrustManager, event.sslErrorHandler)
    }

    public override fun onStart() {
        super.onStart()
        eventBus.register(this)
    }

    public override fun onStop() {
        super.onStop()
        eventBus.unregister(this)
    }

    companion object {
        private val TAG = "BaseActivity"
    }
}