Make some improvements in captcha dialog (#2393)

* Add improvements retrying after captcha solved

* Add showAuthDialog from BaseActivity instead of displaying this dialog manually

* Add getCookieStore() with removeAll impl in WebkitCookieManagerProxy

* Add debounce to captcha dialog showing logic

* Add refresh button to captcha dialog

* Destroy webview along with captcha dialog

* Add clear webkit cookies button to debug menu

* Add captcha error message

* Update captcha verified message

app/src/main/java/io/github/wulkanowy/services/alarm/TimetableNotificationSchedulerHelper.kt

@@ -65,8 +65,6 @@ class TimetableNotificationSchedulerHelper @Inject constructor(
                     range = lesson.start..lesson.end,
                     requestCode = getRequestCode(lesson.start, studentId)
                 )
-
-                Timber.d("TimetableNotification canceled: type 1 & 2, subject: ${lesson.subject}, start: ${lesson.start}, student: $studentId")
             }
         }
     }

app/src/main/java/io/github/wulkanowy/ui/base/BaseDialogFragment.kt

@@ -8,7 +8,6 @@ import android.widget.Toast
 import androidx.fragment.app.DialogFragment
 import androidx.viewbinding.ViewBinding
 import com.google.android.material.elevation.SurfaceColors
-import io.github.wulkanowy.ui.modules.auth.AuthDialog
 import io.github.wulkanowy.utils.AnalyticsHelper
 import io.github.wulkanowy.utils.lifecycleAwareVariable
 import javax.inject.Inject
@@ -49,7 +48,7 @@ abstract class BaseDialogFragment<VB : ViewBinding> : DialogFragment(), BaseView
     }
 
     override fun showAuthDialog() {
-        AuthDialog.newInstance().show(childFragmentManager, "auth_dialog")
+        (activity as? BaseActivity<*, *>)?.showAuthDialog()
     }
 
     override fun showErrorDetailsDialog(error: Throwable) {

app/src/main/java/io/github/wulkanowy/ui/base/BaseFragment.kt

@@ -7,7 +7,6 @@ import androidx.viewbinding.ViewBinding
 import com.google.android.material.snackbar.Snackbar
 import com.google.android.material.snackbar.Snackbar.LENGTH_LONG
 import io.github.wulkanowy.R
-import io.github.wulkanowy.ui.modules.auth.AuthDialog
 import io.github.wulkanowy.utils.lifecycleAwareVariable
 
 abstract class BaseFragment<VB : ViewBinding>(@LayoutRes layoutId: Int) : Fragment(layoutId),
@@ -52,7 +51,7 @@ abstract class BaseFragment<VB : ViewBinding>(@LayoutRes layoutId: Int) : Fragme
     }
 
     override fun showAuthDialog() {
-        AuthDialog.newInstance().show(childFragmentManager, "auth_dialog")
+        (activity as? BaseActivity<*, *>)?.showAuthDialog()
     }
 
     override fun openClearLoginView() {

app/src/main/java/io/github/wulkanowy/ui/modules/captcha/CaptchaDialog.kt

@@ -5,12 +5,11 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.webkit.WebResourceError
-import android.webkit.WebResourceRequest
 import android.webkit.WebView
 import android.webkit.WebViewClient
 import androidx.core.os.bundleOf
 import dagger.hilt.android.AndroidEntryPoint
+import io.github.wulkanowy.R
 import io.github.wulkanowy.databinding.DialogCaptchaBinding
 import io.github.wulkanowy.sdk.Sdk
 import io.github.wulkanowy.ui.base.BaseDialogFragment
@@ -23,8 +22,13 @@ class CaptchaDialog : BaseDialogFragment<DialogCaptchaBinding>() {
     @Inject
     lateinit var sdk: Sdk
 
+    private var webView: WebView? = null
+
     companion object {
+        const val CAPTCHA_SUCCESS = "captcha_success"
         private const val CAPTCHA_URL = "captcha_url"
+        private const val CAPTCHA_CHECK_JS = "document.getElementById('challenge-running') == null"
+
         fun newInstance(url: String?): CaptchaDialog {
             return CaptchaDialog().apply {
                 arguments = bundleOf(CAPTCHA_URL to url)
@@ -41,8 +45,14 @@ class CaptchaDialog : BaseDialogFragment<DialogCaptchaBinding>() {
     @SuppressLint("SetJavaScriptEnabled")
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
+        isCancelable = false
+        binding.captchaRefresh.setOnClickListener {
+            binding.captchaWebview.loadUrl(arguments?.getString(CAPTCHA_URL).orEmpty())
+        }
+        binding.captchaClose.setOnClickListener { dismiss() }
 
         with(binding.captchaWebview) {
+            webView = this
             with(settings) {
                 javaScriptEnabled = true
                 userAgentString = sdk.userAgent
@@ -50,23 +60,27 @@ class CaptchaDialog : BaseDialogFragment<DialogCaptchaBinding>() {
 
             webViewClient = object : WebViewClient() {
                 override fun onPageFinished(view: WebView?, url: String?) {
-                    view?.evaluateJavascript("document.getElementById('challenge-running') == undefined") {
+                    view?.evaluateJavascript(CAPTCHA_CHECK_JS) {
                         if (it == "true") {
-                            dismiss()
+                            onChallengeAccepted()
-                        } else Timber.e("JS result: $it")
+                        }
                     }
                 }
-
-                override fun onReceivedError(
-                    view: WebView?,
-                    request: WebResourceRequest?,
-                    error: WebResourceError?
-                ) {
-                    super.onReceivedError(view, request, error)
-                }
             }
 
             loadUrl(arguments?.getString(CAPTCHA_URL).orEmpty())
         }
     }
+
+    private fun onChallengeAccepted() {
+        runCatching { parentFragmentManager.setFragmentResult(CAPTCHA_SUCCESS, bundleOf()) }
+            .onFailure { Timber.e(it) }
+        showMessage(getString(R.string.captcha_verified_message))
+        dismiss()
+    }
+
+    override fun onDestroy() {
+        webView?.destroy()
+        super.onDestroy()
+    }
 }

app/src/main/java/io/github/wulkanowy/ui/modules/dashboard/DashboardFragment.kt

@@ -18,6 +18,7 @@ import io.github.wulkanowy.databinding.FragmentDashboardBinding
 import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.account.accountdetails.AccountDetailsFragment
 import io.github.wulkanowy.ui.modules.attendance.summary.AttendanceSummaryFragment
+import io.github.wulkanowy.ui.modules.captcha.CaptchaDialog.Companion.CAPTCHA_SUCCESS
 import io.github.wulkanowy.ui.modules.conference.ConferenceFragment
 import io.github.wulkanowy.ui.modules.dashboard.adapters.DashboardAdapter
 import io.github.wulkanowy.ui.modules.exam.ExamFragment
@@ -36,6 +37,7 @@ import io.github.wulkanowy.utils.getErrorString
 import io.github.wulkanowy.utils.getThemeAttrColor
 import io.github.wulkanowy.utils.openInternetBrowser
 import io.github.wulkanowy.utils.toFormattedString
+import timber.log.Timber
 import java.time.LocalDate
 import javax.inject.Inject
 
@@ -62,6 +64,9 @@ class DashboardFragment : BaseFragment<FragmentDashboardBinding>(R.layout.fragme
             return ((recyclerWidth - margin) / resources.displayMetrics.density).toInt()
         }
 
+    override val isViewEmpty
+        get() = dashboardAdapter.itemCount == 0
+
     companion object {
 
         fun newInstance() = DashboardFragment()
@@ -77,6 +82,13 @@ class DashboardFragment : BaseFragment<FragmentDashboardBinding>(R.layout.fragme
         super.onViewCreated(view, savedInstanceState)
         binding = FragmentDashboardBinding.bind(view)
         presenter.onAttachView(this)
+        initializeCaptchaResultObserver()
+    }
+
+    private fun initializeCaptchaResultObserver() {
+        childFragmentManager.setFragmentResultListener(CAPTCHA_SUCCESS, this) { _, _ ->
+            presenter.onRetryAfterCaptcha()
+        }
     }
 
     override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {

app/src/main/java/io/github/wulkanowy/ui/modules/dashboard/DashboardPresenter.kt

@@ -239,6 +239,14 @@ class DashboardPresenter @Inject constructor(
         loadData(selectedDashboardTiles, forceRefresh = true)
     }
 
+    fun onRetryAfterCaptcha() {
+        view?.run {
+            showErrorView(false)
+            showProgress(true)
+        }
+        loadData(selectedDashboardTiles, forceRefresh = true)
+    }
+
     fun onViewReselected() {
         Timber.i("Dashboard view is reselected")
         view?.run {

app/src/main/java/io/github/wulkanowy/ui/modules/dashboard/DashboardView.kt

@@ -6,6 +6,8 @@ interface DashboardView : BaseView {
 
     val tileWidth: Int
 
+    val isViewEmpty: Boolean
+
     fun initView()
 
     fun updateData(data: List<DashboardItem>)
@@ -27,6 +29,5 @@ interface DashboardView : BaseView {
     fun popViewToRoot()
 
     fun openNotificationsCenterView()
-
     fun openInternetBrowser(url: String)
 }

app/src/main/java/io/github/wulkanowy/ui/modules/debug/DebugFragment.kt

@@ -2,6 +2,7 @@ package io.github.wulkanowy.ui.modules.debug
 
 import android.os.Bundle
 import android.view.View
+import android.webkit.CookieManager
 import androidx.recyclerview.widget.LinearLayoutManager
 import dagger.hilt.android.AndroidEntryPoint
 import io.github.wulkanowy.R
@@ -58,6 +59,10 @@ class DebugFragment : BaseFragment<FragmentDebugBinding>(R.layout.fragment_debug
         (activity as? MainActivity)?.pushView(NotificationDebugFragment.newInstance())
     }
 
+    override fun clearWebkitCookies() {
+        CookieManager.getInstance().removeAllCookies(null)
+    }
+
     override fun onDestroyView() {
         presenter.onDetachView()
         super.onDestroyView()

app/src/main/java/io/github/wulkanowy/ui/modules/debug/DebugPresenter.kt

@@ -15,6 +15,7 @@ class DebugPresenter @Inject constructor(
     val items = listOf(
         DebugItem(R.string.logviewer_title),
         DebugItem(R.string.notification_debug_title),
+        DebugItem(R.string.debug_cookies_clear),
     )
 
     override fun onAttachView(view: DebugView) {
@@ -31,6 +32,7 @@ class DebugPresenter @Inject constructor(
         when (item.title) {
             R.string.logviewer_title -> view?.openLogViewer()
             R.string.notification_debug_title -> view?.openNotificationsDebug()
+            R.string.debug_cookies_clear -> view?.clearWebkitCookies()
             else -> Timber.d("Unknown debug item: $item")
         }
     }

app/src/main/java/io/github/wulkanowy/ui/modules/debug/DebugView.kt

@@ -11,4 +11,6 @@ interface DebugView : BaseView {
     fun openLogViewer()
 
     fun openNotificationsDebug()
+
+    fun clearWebkitCookies()
 }

app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormFragment.kt

@@ -7,6 +7,7 @@ import android.view.View.GONE
 import android.view.View.VISIBLE
 import androidx.core.view.isVisible
 import androidx.core.widget.doOnTextChanged
+import androidx.fragment.app.setFragmentResultListener
 import dagger.hilt.android.AndroidEntryPoint
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.AdminMessage
@@ -14,6 +15,7 @@ import io.github.wulkanowy.data.pojos.RegisterUser
 import io.github.wulkanowy.data.repositories.PreferencesRepository
 import io.github.wulkanowy.databinding.FragmentLoginFormBinding
 import io.github.wulkanowy.ui.base.BaseFragment
+import io.github.wulkanowy.ui.modules.captcha.CaptchaDialog
 import io.github.wulkanowy.ui.modules.dashboard.viewholders.AdminMessageViewHolder
 import io.github.wulkanowy.ui.modules.login.LoginActivity
 import io.github.wulkanowy.ui.modules.login.LoginData
@@ -72,6 +74,13 @@ class LoginFormFragment : BaseFragment<FragmentLoginFormBinding>(R.layout.fragme
         super.onViewCreated(view, savedInstanceState)
         binding = FragmentLoginFormBinding.bind(view)
         presenter.onAttachView(this)
+        initializeCaptchaResultObserver()
+    }
+
+    private fun initializeCaptchaResultObserver() {
+        setFragmentResultListener(CaptchaDialog.CAPTCHA_SUCCESS) { _, _ ->
+            presenter.onRetryAfterCaptcha()
+        }
     }
 
     override fun initView() {

app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormPresenter.kt

@@ -152,6 +152,10 @@ class LoginFormPresenter @Inject constructor(
         )
     }
 
+    fun onRetryAfterCaptcha() {
+        onSignInClick()
+    }
+
     fun onSignInClick() {
         val loginData = getLoginData()
 

app/src/main/java/io/github/wulkanowy/ui/modules/main/MainActivity.kt

@@ -16,6 +16,7 @@ import androidx.core.view.isVisible
 import androidx.core.view.updateLayoutParams
 import androidx.fragment.app.DialogFragment
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.lifecycleScope
 import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
@@ -30,6 +31,8 @@ import io.github.wulkanowy.databinding.ActivityMainBinding
 import io.github.wulkanowy.ui.base.BaseActivity
 import io.github.wulkanowy.ui.modules.Destination
 import io.github.wulkanowy.ui.modules.account.accountquick.AccountQuickDialog
+import io.github.wulkanowy.ui.modules.auth.AuthDialog
+import io.github.wulkanowy.ui.modules.captcha.CaptchaDialog
 import io.github.wulkanowy.ui.modules.settings.appearance.menuorder.AppMenuItem
 import io.github.wulkanowy.utils.AnalyticsHelper
 import io.github.wulkanowy.utils.AppInfo
@@ -40,10 +43,17 @@ import io.github.wulkanowy.utils.dpToPx
 import io.github.wulkanowy.utils.nickOrName
 import io.github.wulkanowy.utils.safelyPopFragments
 import io.github.wulkanowy.utils.setOnViewChangeListener
+import kotlinx.coroutines.FlowPreview
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.debounce
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.launch
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
 import timber.log.Timber
 import javax.inject.Inject
+import kotlin.time.Duration.Companion.seconds
 
 @AndroidEntryPoint
 class MainActivity : BaseActivity<MainPresenter, ActivityMainBinding>(), MainView,
@@ -73,6 +83,8 @@ class MainActivity : BaseActivity<MainPresenter, ActivityMainBinding>(), MainVie
     private val navController =
         FragNavController(supportFragmentManager, R.id.main_fragment_container)
 
+    private val captchaVerificationEvent = MutableSharedFlow<String?>()
+
     companion object {
 
         private const val EXTRA_START_DESTINATION = "start_destination_json"
@@ -144,6 +156,7 @@ class MainActivity : BaseActivity<MainPresenter, ActivityMainBinding>(), MainVie
         initializeToolbar()
         initializeBottomNavigation(startMenuIndex, rootAppMenuItems)
         initializeNavController(startMenuIndex, rootUpdatedDestinations)
+        initializeCaptchaVerificationEvent()
     }
 
     private fun initializeNavController(
@@ -323,6 +336,27 @@ class MainActivity : BaseActivity<MainPresenter, ActivityMainBinding>(), MainVie
             .show()
     }
 
+    @OptIn(FlowPreview::class)
+    private fun initializeCaptchaVerificationEvent() {
+        captchaVerificationEvent
+            .debounce(1.seconds)
+            .onEach { url ->
+                Timber.d("Showing captcha dialog for: $url")
+                showDialogFragment(CaptchaDialog.newInstance(url))
+            }
+            .launchIn(lifecycleScope)
+    }
+
+    override fun onCaptchaVerificationRequired(url: String?) {
+        lifecycleScope.launch {
+            captchaVerificationEvent.emit(url)
+        }
+    }
+
+    override fun showAuthDialog() {
+        showDialogFragment(AuthDialog.newInstance())
+    }
+
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
         navController.onSaveInstanceState(outState)

app/src/main/java/io/github/wulkanowy/ui/modules/settings/advanced/AdvancedFragment.kt

@@ -8,7 +8,6 @@ import dagger.hilt.android.AndroidEntryPoint
 import io.github.wulkanowy.R
 import io.github.wulkanowy.ui.base.BaseActivity
 import io.github.wulkanowy.ui.base.ErrorDialog
-import io.github.wulkanowy.ui.modules.auth.AuthDialog
 import io.github.wulkanowy.ui.modules.main.MainView
 import io.github.wulkanowy.utils.AppInfo
 import javax.inject.Inject
@@ -72,7 +71,7 @@ class AdvancedFragment : PreferenceFragmentCompat(),
     }
 
     override fun showAuthDialog() {
-        AuthDialog.newInstance().show(childFragmentManager, "auth_dialog")
+        (activity as? BaseActivity<*, *>)?.showAuthDialog()
     }
 
     override fun onResume() {

app/src/main/java/io/github/wulkanowy/ui/modules/settings/appearance/AppearanceFragment.kt

@@ -9,7 +9,6 @@ import dagger.hilt.android.AndroidEntryPoint
 import io.github.wulkanowy.R
 import io.github.wulkanowy.ui.base.BaseActivity
 import io.github.wulkanowy.ui.base.ErrorDialog
-import io.github.wulkanowy.ui.modules.auth.AuthDialog
 import io.github.wulkanowy.ui.modules.main.MainView
 import io.github.wulkanowy.utils.AppInfo
 import javax.inject.Inject
@@ -88,7 +87,7 @@ class AppearanceFragment : PreferenceFragmentCompat(),
     }
 
     override fun showAuthDialog() {
-        AuthDialog.newInstance().show(childFragmentManager, "auth_dialog")
+        (activity as? BaseActivity<*, *>)?.showAuthDialog()
     }
 
     override fun onResume() {

app/src/main/java/io/github/wulkanowy/ui/modules/settings/notifications/NotificationsFragment.kt

@@ -21,7 +21,6 @@ import dagger.hilt.android.AndroidEntryPoint
 import io.github.wulkanowy.R
 import io.github.wulkanowy.ui.base.BaseActivity
 import io.github.wulkanowy.ui.base.ErrorDialog
-import io.github.wulkanowy.ui.modules.auth.AuthDialog
 import io.github.wulkanowy.ui.modules.main.MainView
 import io.github.wulkanowy.utils.AppInfo
 import io.github.wulkanowy.utils.openInternetBrowser
@@ -158,7 +157,7 @@ class NotificationsFragment : PreferenceFragmentCompat(),
     }
 
     override fun showAuthDialog() {
-        AuthDialog.newInstance().show(childFragmentManager, "auth_dialog")
+        (activity as? BaseActivity<*, *>)?.showAuthDialog()
     }
 
     override fun showFixSyncDialog() {

app/src/main/java/io/github/wulkanowy/ui/modules/settings/sync/SyncFragment.kt

@@ -10,7 +10,6 @@ import dagger.hilt.android.AndroidEntryPoint
 import io.github.wulkanowy.R
 import io.github.wulkanowy.ui.base.BaseActivity
 import io.github.wulkanowy.ui.base.ErrorDialog
-import io.github.wulkanowy.ui.modules.auth.AuthDialog
 import io.github.wulkanowy.ui.modules.main.MainView
 import javax.inject.Inject
 
@@ -109,7 +108,7 @@ class SyncFragment : PreferenceFragmentCompat(),
     }
 
     override fun showAuthDialog() {
-        AuthDialog.newInstance().show(childFragmentManager, "auth_dialog")
+        (activity as? BaseActivity<*, *>)?.showAuthDialog()
     }
 
     override fun onResume() {

app/src/main/java/io/github/wulkanowy/utils/ExceptionExtension.kt

@@ -3,6 +3,7 @@ package io.github.wulkanowy.utils
 import android.content.res.Resources
 import io.github.wulkanowy.R
 import io.github.wulkanowy.sdk.exception.FeatureNotAvailableException
+import io.github.wulkanowy.sdk.scrapper.exception.CloudflareVerificationException
 import io.github.wulkanowy.sdk.scrapper.exception.FeatureDisabledException
 import io.github.wulkanowy.sdk.scrapper.exception.ScrapperException
 import io.github.wulkanowy.sdk.scrapper.exception.ServiceUnavailableException
@@ -34,6 +35,7 @@ fun Resources.getErrorString(error: Throwable): String = when (error) {
     is FeatureNotAvailableException -> R.string.error_feature_not_available
     is VulcanException -> R.string.error_unknown_uonet
     is ScrapperException -> R.string.error_unknown_app
+    is CloudflareVerificationException -> R.string.error_cloudflare_captcha
     is SSLHandshakeException -> when {
         error.isCausedByCertificateNotValidNow() -> R.string.error_invalid_device_datetime
         else -> R.string.error_timeout

app/src/main/java/io/github/wulkanowy/utils/WebkitCookieManagerProxy.kt

@@ -1,6 +1,8 @@
 package io.github.wulkanowy.utils
 
 import java.net.CookiePolicy
+import java.net.CookieStore
+import java.net.HttpCookie
 import java.net.URI
 import android.webkit.CookieManager as WebkitCookieManager
 import java.net.CookieManager as JavaCookieManager
@@ -36,4 +38,21 @@ class WebkitCookieManagerProxy : JavaCookieManager(null, CookiePolicy.ACCEPT_ALL
         if (cookie != null) res["Cookie"] = listOf(cookie)
         return res
     }
+
+    override fun getCookieStore(): CookieStore {
+        val cookies = super.getCookieStore()
+        return object : CookieStore {
+            override fun add(uri: URI?, cookie: HttpCookie?) = cookies.add(uri, cookie)
+            override fun get(uri: URI?): List<HttpCookie> = cookies.get(uri)
+            override fun getCookies(): List<HttpCookie> = cookies.cookies
+            override fun getURIs(): List<URI> = cookies.urIs
+            override fun remove(uri: URI?, cookie: HttpCookie?): Boolean =
+                cookies.remove(uri, cookie)
+
+            override fun removeAll(): Boolean {
+                webkitCookieManager.removeAllCookies(null)
+                return true
+            }
+        }
+    }
 }

app/src/main/res/layout/dialog_captcha.xml

@@ -1,12 +1,51 @@
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:minWidth="350dp"
     tools:context=".ui.modules.captcha.CaptchaDialog">
 
+    <TextView
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginHorizontal="20dp"
+        android:gravity="center_vertical"
+        android:text="@string/captcha_dialog_title"
+        app:layout_constraintBottom_toBottomOf="@id/captcha_close"
+        app:layout_constraintEnd_toStartOf="@id/captcha_refresh"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/captcha_refresh"
+        style="@style/Widget.Material3.Button.IconButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="end"
+        android:contentDescription="@string/logviewer_refresh"
+        app:icon="@drawable/ic_refresh"
+        app:iconTint="?colorOnSurface"
+        app:layout_constraintEnd_toStartOf="@id/captcha_close"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/captcha_close"
+        style="@style/Widget.Material3.Button.IconButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="end"
+        android:contentDescription="@string/all_close"
+        app:icon="@drawable/ic_all_close_circle"
+        app:iconTint="?colorOnSurface"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
     <WebView
         android:id="@+id/captcha_webview"
         android:layout_width="match_parent"
-        android:layout_height="match_parent" />
+        android:layout_height="match_parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/captcha_close" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/strings.xml

@@ -14,6 +14,7 @@
     <string name="logviewer_title">Log viewer</string>
     <string name="debug_title">Debug</string>
     <string name="notification_debug_title">Notification debug</string>
+    <string name="debug_cookies_clear">Clear webview cookies</string>
     <string name="contributors_title">Contributors</string>
     <string name="license_title">Licenses</string>
     <string name="message_title">Messages</string>
@@ -833,6 +834,11 @@
     <string name="auth_button_skip">Skip for now</string>
 
 
+    <!--Captcha-->
+    <string name="captcha_dialog_title">Verification is in progress. Wait…</string>
+    <string name="captcha_verified_message">Verified successfully</string>
+
+
     <!--Errors-->
     <string name="error_no_internet">No internet connection</string>
     <string name="error_invalid_device_datetime">An error occurred. Check your device clock</string>
@@ -842,6 +848,7 @@
     <string name="error_service_unavailable">Maintenance underway UONET + register. Try again later</string>
     <string name="error_unknown_uonet">Unknown UONET + register error. Try again later</string>
     <string name="error_unknown_app">Unknown application error. Please try again later</string>
+    <string name="error_cloudflare_captcha">Captcha verification required</string>
     <string name="error_unknown">An unexpected error occurred</string>
     <string name="error_feature_disabled">Feature disabled by your school</string>
     <string name="error_feature_not_available">Feature not available. Login in a mode other than Mobile API</string>