Merge pull request #75 from szkolny-eu/feature/availability-refactor

[API] Refactor register availability checking module.

app/src/main/java/pl/szczodrzynski/edziennik/App.kt

@@ -71,6 +71,7 @@ class App : MultiDexApplication(), Configuration.Provider, CoroutineScope {
     val permissionManager by lazy { PermissionManager(this) }
     val attendanceManager by lazy { AttendanceManager(this) }
     val buildManager by lazy { BuildManager(this) }
+    val availabilityManager by lazy { AvailabilityManager(this) }
 
     val db
         get() = App.db
@@ -174,8 +175,8 @@ class App : MultiDexApplication(), Configuration.Provider, CoroutineScope {
         App.config = Config(App.db)
         App.profile = Profile(0, 0, 0, "")
         debugMode = BuildConfig.DEBUG
-        devMode = config.debugMode || debugMode
+        devMode = config.devMode ?: debugMode
-        enableChucker = config.enableChucker || devMode
+        enableChucker = config.enableChucker ?: devMode
 
         if (!profileLoadById(config.lastProfileId)) {
             db.profileDao().firstId?.let { profileLoadById(it) }

app/src/main/java/pl/szczodrzynski/edziennik/MainActivity.kt

@@ -85,6 +85,8 @@ import pl.szczodrzynski.edziennik.ui.modules.webpush.WebPushFragment
 import pl.szczodrzynski.edziennik.utils.*
 import pl.szczodrzynski.edziennik.utils.Utils.d
 import pl.szczodrzynski.edziennik.utils.Utils.dpToPx
+import pl.szczodrzynski.edziennik.utils.managers.AvailabilityManager
+import pl.szczodrzynski.edziennik.utils.managers.AvailabilityManager.Error.Type
 import pl.szczodrzynski.edziennik.utils.models.Date
 import pl.szczodrzynski.edziennik.utils.models.NavTarget
 import pl.szczodrzynski.navlib.*
@@ -634,45 +636,23 @@ class MainActivity : AppCompatActivity(), CoroutineScope {
             return
         }
 
-        app.profile.registerName?.let { registerName ->
+        val error = withContext(Dispatchers.IO) {
-            var status = app.config.sync.registerAvailability[registerName]
+            app.availabilityManager.check(app.profile)
-            if (status == null || status.nextCheckAt < currentTimeUnix()) {
-                val api = SzkolnyApi(app)
-                val result = withContext(Dispatchers.IO) {
-                    return@withContext api.runCatching({
-                        val availability = getRegisterAvailability()
-                        app.config.sync.registerAvailability = availability
-                        availability[registerName]
-                    }, onError = {
-                        if (it.toErrorCode() == ERROR_API_INVALID_SIGNATURE) {
-                            return@withContext false
         }
-                        return@withContext it
+        when (error?.type) {
-                    })
+            Type.NOT_AVAILABLE -> {
-                }
-
-                when (result) {
-                    false -> {
-                        Toast.makeText(this@MainActivity, R.string.error_no_api_access, Toast.LENGTH_SHORT).show()
-                        return@let
-                    }
-                    is Throwable -> {
-                        errorSnackbar.addError(result.toApiError(TAG)).show()
-                        return
-                    }
-                    is RegisterAvailabilityStatus -> {
-                        status = result
-                    }
-                }
-            }
-
-            if (status?.available != true || status.minVersionCode > BuildConfig.VERSION_CODE) {
                 swipeRefreshLayout.isRefreshing = false
                 loadTarget(DRAWER_ITEM_HOME)
-                if (status != null)
+                RegisterUnavailableDialog(this, error.status!!)
-                    RegisterUnavailableDialog(this, status)
                 return
             }
+            Type.API_ERROR -> {
+                errorSnackbar.addError(error.apiError!!).show()
+                return
+            }
+            Type.NO_API_ACCESS -> {
+                Toast.makeText(this, R.string.error_no_api_access, Toast.LENGTH_SHORT).show()
+            }
         }
 
         swipeRefreshLayout.isRefreshing = true
@@ -699,10 +679,9 @@ class MainActivity : AppCompatActivity(), CoroutineScope {
     @Subscribe(threadMode = ThreadMode.MAIN, sticky = true)
     fun onRegisterAvailabilityEvent(event: RegisterAvailabilityEvent) {
         EventBus.getDefault().removeStickyEvent(event)
-        app.profile.registerName?.let { registerName ->
+        val error = app.availabilityManager.check(app.profile, cacheOnly = true)
-            event.data[registerName]?.let {
+        if (error != null) {
-                RegisterUnavailableDialog(this, it)
+            RegisterUnavailableDialog(this, error.status!!)
-            }
         }
     }
     @Subscribe(threadMode = ThreadMode.MAIN)

app/src/main/java/pl/szczodrzynski/edziennik/config/Config.kt

@@ -12,10 +12,7 @@ import kotlinx.coroutines.launch
 import pl.szczodrzynski.edziennik.App
 import pl.szczodrzynski.edziennik.BuildConfig
 import pl.szczodrzynski.edziennik.config.db.ConfigEntry
-import pl.szczodrzynski.edziennik.config.utils.ConfigMigration
+import pl.szczodrzynski.edziennik.config.utils.*
-import pl.szczodrzynski.edziennik.config.utils.get
-import pl.szczodrzynski.edziennik.config.utils.set
-import pl.szczodrzynski.edziennik.config.utils.toHashMap
 import pl.szczodrzynski.edziennik.data.api.szkolny.response.Update
 import pl.szczodrzynski.edziennik.data.db.AppDb
 import kotlin.coroutines.CoroutineContext
@@ -75,15 +72,15 @@ class Config(val db: AppDb) : CoroutineScope, AbstractConfig {
         get() { mPrivacyPolicyAccepted = mPrivacyPolicyAccepted ?: values.get("privacyPolicyAccepted", false); return mPrivacyPolicyAccepted ?: false }
         set(value) { set("privacyPolicyAccepted", value); mPrivacyPolicyAccepted = value }
 
-    private var mDebugMode: Boolean? = null
+    private var mDevMode: Boolean? = null
-    var debugMode: Boolean
+    var devMode: Boolean?
-        get() { mDebugMode = mDebugMode ?: values.get("debugMode", false); return mDebugMode ?: false }
+        get() { mDevMode = mDevMode ?: values.getBooleanOrNull("debugMode"); return mDevMode }
-        set(value) { set("debugMode", value); mDebugMode = value }
+        set(value) { set("debugMode", value?.toString()); mDevMode = value }
 
     private var mEnableChucker: Boolean? = null
-    var enableChucker: Boolean
+    var enableChucker: Boolean?
-        get() { mEnableChucker = mEnableChucker ?: values.get("enableChucker", false); return mEnableChucker ?: false }
+        get() { mEnableChucker = mEnableChucker ?: values.getBooleanOrNull("enableChucker"); return mEnableChucker }
-        set(value) { set("enableChucker", value); mEnableChucker = value }
+        set(value) { set("enableChucker", value?.toString()); mEnableChucker = value }
 
     private var mDevModePassword: String? = null
     var devModePassword: String?
@@ -125,6 +122,11 @@ class Config(val db: AppDb) : CoroutineScope, AbstractConfig {
         get() { mApiInvalidCert = mApiInvalidCert ?: values["apiInvalidCert"]; return mApiInvalidCert }
         set(value) { set("apiInvalidCert", value); mApiInvalidCert = value }
 
+    private var mApiAvailabilityCheck: Boolean? = null
+    var apiAvailabilityCheck: Boolean
+        get() { mApiAvailabilityCheck = mApiAvailabilityCheck ?: values.get("apiAvailabilityCheck", true); return mApiAvailabilityCheck ?: true }
+        set(value) { set("apiAvailabilityCheck", value); mApiAvailabilityCheck = value }
+
     private var rawEntries: List<ConfigEntry> = db.configDao().getAllNow()
     private val profileConfigs: HashMap<Int, ProfileConfig> = hashMapOf()
     init {

app/src/main/java/pl/szczodrzynski/edziennik/config/utils/ConfigExtensions.kt

@@ -59,6 +59,9 @@ fun HashMap<String, String?>.get(key: String, default: String?): String? {
 fun HashMap<String, String?>.get(key: String, default: Boolean): Boolean {
     return this[key]?.toBoolean() ?: default
 }
+fun HashMap<String, String?>.getBooleanOrNull(key: String): Boolean? {
+    return this[key]?.toBooleanStrictOrNull()
+}
 fun HashMap<String, String?>.get(key: String, default: Int): Int {
     return this[key]?.toIntOrNull() ?: default
 }

app/src/main/java/pl/szczodrzynski/edziennik/config/utils/ConfigMigration.kt

@@ -67,7 +67,7 @@ class ConfigMigration(app: App, config: Config) {
         if (dataVersion < 3) {
             update = null
             privacyPolicyAccepted = false
-            debugMode = false
+            devMode = null
             devModePassword = null
             appInstalledTime = 0L
             appRateSnackbarTime = 0L

app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/EdziennikTask.kt

@@ -18,7 +18,6 @@ import pl.szczodrzynski.edziennik.data.api.events.RegisterAvailabilityEvent
 import pl.szczodrzynski.edziennik.data.api.interfaces.EdziennikCallback
 import pl.szczodrzynski.edziennik.data.api.interfaces.EdziennikInterface
 import pl.szczodrzynski.edziennik.data.api.models.ApiError
-import pl.szczodrzynski.edziennik.data.api.szkolny.SzkolnyApi
 import pl.szczodrzynski.edziennik.data.api.task.IApiTask
 import pl.szczodrzynski.edziennik.data.db.entity.LoginStore
 import pl.szczodrzynski.edziennik.data.db.entity.Profile
@@ -27,6 +26,7 @@ import pl.szczodrzynski.edziennik.data.db.full.AnnouncementFull
 import pl.szczodrzynski.edziennik.data.db.full.EventFull
 import pl.szczodrzynski.edziennik.data.db.full.MessageFull
 import pl.szczodrzynski.edziennik.utils.Utils.d
+import pl.szczodrzynski.edziennik.utils.managers.AvailabilityManager.Error.Type
 
 open class EdziennikTask(override val profileId: Int, val request: Any) : IApiTask(profileId) {
     companion object {
@@ -90,35 +90,21 @@ open class EdziennikTask(override val profileId: Int, val request: Any) : IApiTa
                 return
             }
 
-            profile.registerName?.also { registerName ->
+            val error = app.availabilityManager.check(profile)
-                var status = app.config.sync.registerAvailability[registerName]
+            when (error?.type) {
-                if (status == null || status.nextCheckAt < currentTimeUnix()) {
+                Type.NOT_AVAILABLE -> {
-                    val api = SzkolnyApi(app)
-                    api.runCatching({
-                        val availability = getRegisterAvailability()
-                        app.config.sync.registerAvailability = availability
-                        status = availability[registerName]
-                    }, onError = {
-                        val apiError = it.toApiError(TAG)
-                        if (apiError.errorCode == ERROR_API_INVALID_SIGNATURE) {
-                            return@also
-                        }
-                        taskCallback.onError(apiError)
-                        return
-                    })
-                }
-
-                if (status?.available != true
-                        || status?.minVersionCode ?: BuildConfig.VERSION_CODE > BuildConfig.VERSION_CODE) {
                     if (EventBus.getDefault().hasSubscriberForEvent(RegisterAvailabilityEvent::class.java)) {
-                        EventBus.getDefault().postSticky(
+                        EventBus.getDefault().postSticky(RegisterAvailabilityEvent())
-                                RegisterAvailabilityEvent(app.config.sync.registerAvailability)
-                        )
                     }
                     cancel()
                     taskCallback.onCompleted()
                     return
                 }
+                Type.API_ERROR -> {
+                    taskCallback.onError(error.apiError!!)
+                    return
+                }
+                else -> return@let
             }
         }
 

app/src/main/java/pl/szczodrzynski/edziennik/data/api/events/RegisterAvailabilityEvent.kt

@@ -4,8 +4,4 @@
 
 package pl.szczodrzynski.edziennik.data.api.events
 
-import pl.szczodrzynski.edziennik.data.api.szkolny.response.RegisterAvailabilityStatus
+class RegisterAvailabilityEvent()
-
-data class RegisterAvailabilityEvent(
-        val data: Map< String, RegisterAvailabilityStatus>
-)

app/src/main/java/pl/szczodrzynski/edziennik/data/db/entity/Profile.kt

@@ -140,7 +140,7 @@ open class Profile(
             LOGIN_TYPE_MOBIDZIENNIK -> "mobidziennik"
             LOGIN_TYPE_PODLASIE -> "podlasie"
             LOGIN_TYPE_EDUDZIENNIK -> "edudziennik"
-            else -> null
+            else -> "unknown"
         }
 
     override fun getImageDrawable(context: Context): Drawable {

app/src/main/java/pl/szczodrzynski/edziennik/data/firebase/SzkolnyAppFirebase.kt

@@ -60,7 +60,7 @@ class SzkolnyAppFirebase(val app: App, val profiles: List<Profile>, val message:
                     ) ?: return@launch
                     app.config.sync.registerAvailability = data
                     if (EventBus.getDefault().hasSubscriberForEvent(RegisterAvailabilityEvent::class.java)) {
-                        EventBus.getDefault().postSticky(RegisterAvailabilityEvent(data))
+                        EventBus.getDefault().postSticky(RegisterAvailabilityEvent())
                     }
                 }
             }

app/src/main/java/pl/szczodrzynski/edziennik/ui/dialogs/RegisterUnavailableDialog.kt

@@ -42,8 +42,6 @@ class RegisterUnavailableDialog(
     init { run {
         if (activity.isFinishing)
             return@run
-        if (status.available && status.minVersionCode <= BuildConfig.VERSION_CODE)
-            return@run
         onShowListener?.invoke(TAG)
         app = activity.applicationContext as App
 

app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/debug/LabFragment.kt

@@ -41,6 +41,7 @@ class LabFragment : Fragment(), CoroutineScope {
         app = activity.application as App
         b = TemplateFragmentBinding.inflate(inflater)
         b.refreshLayout.setParent(activity.swipeRefreshLayout)
+        b.refreshLayout.isEnabled = false
         return b.root
     }
 

app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/debug/LabPageFragment.kt

@@ -16,6 +16,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
 import pl.szczodrzynski.edziennik.*
+import pl.szczodrzynski.edziennik.config.Config
 import pl.szczodrzynski.edziennik.data.db.entity.Event
 import pl.szczodrzynski.edziennik.databinding.LabFragmentBinding
 import pl.szczodrzynski.edziennik.ui.dialogs.profile.ProfileRemoveDialog
@@ -78,10 +79,10 @@ class LabPageFragment : LazyFragment(), CoroutineScope {
             app.db.eventDao().getRawNow("UPDATE events SET homeworkBody = NULL WHERE profileId = ${App.profileId}")
         }
 
-        b.chucker.isChecked = app.config.enableChucker
+        b.chucker.isChecked = App.enableChucker
-
         b.chucker.onChange { _, isChecked ->
             app.config.enableChucker = isChecked
+            App.enableChucker = isChecked
             MaterialAlertDialogBuilder(activity)
                 .setTitle("Restart")
                 .setMessage("Wymagany restart aplikacji")
@@ -94,9 +95,9 @@ class LabPageFragment : LazyFragment(), CoroutineScope {
                 .show()
         }
 
-
         b.disableDebug.onClick {
-            app.config.debugMode = false
+            app.config.devMode = false
+            App.devMode = false
             MaterialAlertDialogBuilder(activity)
                 .setTitle("Restart")
                 .setMessage("Wymagany restart aplikacji")
@@ -115,6 +116,14 @@ class LabPageFragment : LazyFragment(), CoroutineScope {
             app.profileSave()
         }
 
+        b.resetCert.onClick {
+            app.config.apiInvalidCert = null
+        }
+
+        b.rebuildConfig.onClick {
+            App.config = Config(App.db)
+        }
+
         val profiles = app.db.profileDao().allNow
         b.profile.clear()
         b.profile += profiles.map { TextInputDropDown.Item(it.id.toLong(), "${it.id} ${it.name} archived ${it.archived}", tag = it) }

app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/home/HomeFragment.kt

@@ -163,10 +163,9 @@ class HomeFragment : Fragment(), CoroutineScope {
         if (app.profile.archived)
             items.add(0, HomeArchiveCard(101, app, activity, this, app.profile))
 
-        val status = app.config.sync.registerAvailability[app.profile.registerName]
+        val status = app.availabilityManager.check(app.profile, cacheOnly = true)?.status
         val update = app.config.update
-        if (update != null && update.versionCode > BuildConfig.VERSION_CODE
+        if (update != null && update.versionCode > BuildConfig.VERSION_CODE || status?.userMessage != null) {
-                || status != null && (!status.available || status.minVersionCode > BuildConfig.VERSION_CODE)) {
             items.add(0, HomeAvailabilityCard(102, app, activity, this, app.profile))
         }
 

app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/home/cards/HomeAvailabilityCard.kt

@@ -50,7 +50,8 @@ class HomeAvailabilityCard(
         }
         holder.root += b.root
 
-        val status = app.config.sync.registerAvailability[profile.registerName]
+        val error = app.availabilityManager.check(profile, cacheOnly = true)
+        val status = error?.status
         val update = app.config.update
 
         if (update == null && status == null)
@@ -58,7 +59,8 @@ class HomeAvailabilityCard(
 
         var onInfoClick = { _: View -> }
 
-        if (status != null && !status.available && status.userMessage != null) {
+        // show "register unavailable" only when disabled
+        if (status?.userMessage != null) {
             b.homeAvailabilityTitle.text = HtmlCompat.fromHtml(status.userMessage.title, HtmlCompat.FROM_HTML_MODE_LEGACY)
             b.homeAvailabilityText.text = HtmlCompat.fromHtml(status.userMessage.contentShort, HtmlCompat.FROM_HTML_MODE_LEGACY)
             b.homeAvailabilityUpdate.isVisible = false
@@ -69,6 +71,7 @@ class HomeAvailabilityCard(
                 RegisterUnavailableDialog(activity, status)
             }
         }
+        // show "update available" when available OR version too old for the register
         else if (update != null && update.versionCode > BuildConfig.VERSION_CODE) {
             b.homeAvailabilityTitle.setText(R.string.home_availability_title)
             b.homeAvailabilityText.setText(R.string.home_availability_text, update.versionName)
@@ -78,6 +81,9 @@ class HomeAvailabilityCard(
                 UpdateAvailableDialog(activity, update)
             }
         }
+        else {
+            b.root.isVisible = false
+        }
 
         b.homeAvailabilityUpdate.onClick {
             if (update == null)

app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/login/LoginChooserFragment.kt

@@ -26,13 +26,12 @@ import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import kotlinx.coroutines.*
 import pl.szczodrzynski.edziennik.*
 import pl.szczodrzynski.edziennik.data.api.*
-import pl.szczodrzynski.edziennik.data.api.szkolny.SzkolnyApi
-import pl.szczodrzynski.edziennik.data.api.szkolny.response.RegisterAvailabilityStatus
 import pl.szczodrzynski.edziennik.databinding.LoginChooserFragmentBinding
 import pl.szczodrzynski.edziennik.ui.dialogs.RegisterUnavailableDialog
 import pl.szczodrzynski.edziennik.ui.modules.feedback.FeedbackActivity
 import pl.szczodrzynski.edziennik.utils.BetterLinkMovementMethod
 import pl.szczodrzynski.edziennik.utils.SimpleDividerItemDecoration
+import pl.szczodrzynski.edziennik.utils.managers.AvailabilityManager.Error.Type
 import pl.szczodrzynski.edziennik.utils.models.Date
 import kotlin.coroutines.CoroutineContext
 
@@ -269,52 +268,23 @@ class LoginChooserFragment : Fragment(), CoroutineScope {
     }
 
     private suspend fun checkAvailability(loginType: Int): Boolean {
-        when (loginType) {
+        val error = withContext(Dispatchers.IO) {
-            LOGIN_TYPE_LIBRUS -> "librus"
+            app.availabilityManager.check(loginType)
-            LOGIN_TYPE_VULCAN -> "vulcan"
+        } ?: return true
-            LOGIN_TYPE_IDZIENNIK -> "idziennik"
-            LOGIN_TYPE_MOBIDZIENNIK -> "mobidziennik"
-            LOGIN_TYPE_PODLASIE -> "podlasie"
-            LOGIN_TYPE_EDUDZIENNIK -> "edudziennik"
-            else -> null
-        }?.let { registerName ->
-            var status = app.config.sync.registerAvailability[registerName]
-            if (status == null || status.nextCheckAt < currentTimeUnix()) {
-                val api = SzkolnyApi(app)
-                val result = withContext(Dispatchers.IO) {
-                    return@withContext api.runCatching({
-                        val availability = getRegisterAvailability()
-                        app.config.sync.registerAvailability = availability
-                        availability[registerName]
-                    }, onError = {
-                        if (it.toErrorCode() == ERROR_API_INVALID_SIGNATURE) {
-                            return@withContext false
-                        }
-                        return@withContext it
-                    })
-                }
 
-                when (result) {
+        return when (error.type) {
-                    false -> {
+            Type.NOT_AVAILABLE -> {
+                RegisterUnavailableDialog(activity, error.status!!)
+                false
+            }
+            Type.API_ERROR -> {
+                activity.errorSnackbar.addError(error.apiError!!).show()
+                false
+            }
+            Type.NO_API_ACCESS -> {
                 Toast.makeText(activity, R.string.error_no_api_access, Toast.LENGTH_SHORT).show()
-                        return@let
+                true
-                    }
-                    is Throwable -> {
-                        activity.errorSnackbar.addError(result.toApiError(TAG)).show()
-                        return false
-                    }
-                    is RegisterAvailabilityStatus -> {
-                        status = result
             }
         }
     }
-
-            if (status?.available != true || status.minVersionCode > BuildConfig.VERSION_CODE) {
-                if (status != null)
-                    RegisterUnavailableDialog(activity, status)
-                return false
-            }
-        }
-        return true
-    }
 }

app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/login/LoginPrizeFragment.kt

@@ -53,7 +53,7 @@ class LoginPrizeFragment : Fragment(), CoroutineScope {
                     .setTitle(R.string.are_you_sure)
                     .setMessage(R.string.dev_mode_enable_warning)
                     .setPositiveButton(R.string.yes) { _, _ ->
-                        app.config.debugMode = true
+                        app.config.devMode = true
                         App.devMode = true
                         MaterialAlertDialogBuilder(activity)
                                 .setTitle("Restart")
@@ -67,8 +67,8 @@ class LoginPrizeFragment : Fragment(), CoroutineScope {
                                 .show()
                     }
                     .setNegativeButton(R.string.no) { _, _ ->
-                        app.config.debugMode = false
+                        app.config.devMode = App.debugMode
-                        App.devMode = false
+                        App.devMode = App.debugMode
                         activity.finish()
                     }
                     .show()

app/src/main/java/pl/szczodrzynski/edziennik/utils/managers/AvailabilityManager.kt

@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2021-9-18.
+ */
+
+package pl.szczodrzynski.edziennik.utils.managers
+
+import pl.szczodrzynski.edziennik.App
+import pl.szczodrzynski.edziennik.BuildConfig
+import pl.szczodrzynski.edziennik.currentTimeUnix
+import pl.szczodrzynski.edziennik.data.api.*
+import pl.szczodrzynski.edziennik.data.api.models.ApiError
+import pl.szczodrzynski.edziennik.data.api.szkolny.SzkolnyApi
+import pl.szczodrzynski.edziennik.data.api.szkolny.response.RegisterAvailabilityStatus
+import pl.szczodrzynski.edziennik.data.db.entity.Profile
+import pl.szczodrzynski.edziennik.toApiError
+
+class AvailabilityManager(val app: App) {
+    companion object {
+        private const val TAG = "AvailabilityManager"
+    }
+
+    private val api = SzkolnyApi(app)
+
+    data class Error(
+        val type: Type,
+        val status: RegisterAvailabilityStatus?,
+        val apiError: ApiError?
+    ) {
+        companion object {
+            fun notAvailable(status: RegisterAvailabilityStatus) =
+                Error(Type.NOT_AVAILABLE, status, null)
+
+            fun apiError(apiError: ApiError) =
+                Error(Type.API_ERROR, null, apiError)
+
+            fun noApiAccess() =
+                Error(Type.NO_API_ACCESS, null, null)
+        }
+
+        enum class Type {
+            NOT_AVAILABLE,
+            API_ERROR,
+            NO_API_ACCESS,
+        }
+    }
+
+    fun check(profile: Profile, cacheOnly: Boolean = false): Error? {
+        return check(profile.registerName, cacheOnly)
+    }
+
+    fun check(loginType: Int, cacheOnly: Boolean = false): Error? {
+        val registerName = when (loginType) {
+            LOGIN_TYPE_LIBRUS -> "librus"
+            LOGIN_TYPE_VULCAN -> "vulcan"
+            LOGIN_TYPE_IDZIENNIK -> "idziennik"
+            LOGIN_TYPE_MOBIDZIENNIK -> "mobidziennik"
+            LOGIN_TYPE_PODLASIE -> "podlasie"
+            LOGIN_TYPE_EDUDZIENNIK -> "edudziennik"
+            else -> "unknown"
+        }
+        return check(registerName, cacheOnly)
+    }
+
+    fun check(registerName: String, cacheOnly: Boolean = false): Error? {
+        if (!app.config.apiAvailabilityCheck)
+            return null
+        val status = app.config.sync.registerAvailability[registerName]
+        if (status != null && status.nextCheckAt > currentTimeUnix()) {
+            return reportStatus(status)
+        }
+        if (cacheOnly) {
+            return reportStatus(status)
+        }
+
+        return try {
+            val availability = api.getRegisterAvailability()
+            app.config.sync.registerAvailability = availability
+            reportStatus(availability[registerName])
+        } catch (e: Throwable) {
+            reportApiError(e)
+        }
+    }
+
+    private fun reportStatus(status: RegisterAvailabilityStatus?): Error? {
+        if (status == null)
+            return null
+        if (!status.available || status.minVersionCode > BuildConfig.VERSION_CODE)
+            return Error.notAvailable(status)
+        return null
+    }
+
+    private fun reportApiError(throwable: Throwable): Error {
+        val apiError = throwable.toApiError(TAG)
+        if (apiError.errorCode == ERROR_API_INVALID_SIGNATURE) {
+            app.config.sync.registerAvailability = mapOf()
+            return Error.noApiAccess()
+        }
+        return Error.apiError(apiError)
+    }
+}

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

@@ -1,15 +1,17 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
-<!--
   ~ Copyright (c) Kuba Szczodrzyński 2020-4-3.
   -->
 
-<layout xmlns:app="http://schemas.android.com/apk/res-auto"
+<layout 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"
-    xmlns:android="http://schemas.android.com/apk/res/android"
     tools:ignore="HardcodedText">
 
     <data>
-        <variable name="app" type="pl.szczodrzynski.edziennik.App"/>
+
+        <variable
+            name="app"
+            type="pl.szczodrzynski.edziennik.App" />
     </data>
 
     <ScrollView
@@ -39,7 +41,7 @@
                 android:layout_height="match_parent"
                 app:layout_behavior="@string/appbar_scrolling_view_behavior" />-->
 
-            <Switch
+            <com.google.android.material.checkbox.MaterialCheckBox
                 android:id="@+id/chucker"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
@@ -99,9 +101,9 @@
 
             <pl.szczodrzynski.edziennik.utils.TextInputDropDown
                 android:id="@+id/profile"
+                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                 android:layout_width="match_parent"
-                android:layout_height="wrap_content"
+                android:layout_height="wrap_content" />
-                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox" />
 
             <com.google.android.material.checkbox.MaterialCheckBox
                 android:layout_width="match_parent"
@@ -109,13 +111,36 @@
                 android:checked="@={app.config.archiverEnabled}"
                 android:text="Archiver enabled" />
 
+            <com.google.android.material.checkbox.MaterialCheckBox
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:checked="@={app.config.apiAvailabilityCheck}"
+                android:text="Availability check enabled" />
+
+            <Button
+                android:id="@+id/resetCert"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="Reset API signature"
+                android:textAllCaps="false" />
+
             <Button
                 android:id="@+id/disableDebug"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
+                android:layout_marginTop="24dp"
                 android:text="Disable Dev Mode"
                 android:textAllCaps="false"
                 app:backgroundTint="@color/windowBackgroundRed" />
+
+            <Button
+                android:id="@+id/rebuildConfig"
+                style="@style/Widget.MaterialComponents.Button.OutlinedButton"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginBottom="16dp"
+                android:text="Rebuild App.config"
+                android:textAllCaps="false" />
         </LinearLayout>
     </ScrollView>
 </layout>