Workaround too early loggin in

src/main/kotlin/io/github/wulkanowy/api/login/CertificateResponse.kt

@@ -4,14 +4,17 @@ import pl.droidsonroids.jspoon.annotation.Selector
 
 class CertificateResponse {
 
+    @Selector("title")
+    var title: String = ""
+
     @Selector("form[name=hiddenform]", attr = "abs:action")
-    lateinit var action: String
+    var action: String = ""
 
     @Selector("input[name=wa]", attr = "value")
-    lateinit var wa: String
+    var wa: String = ""
 
     @Selector("input[name=wresult]", attr = "value")
-    lateinit var wresult: String
+    var wresult: String = ""
 
     @Selector("input[name=wctx]", attr = "value", defValue = "")
     var wctx: String = ""

src/main/kotlin/io/github/wulkanowy/api/repository/LoginRepository.kt

@@ -2,6 +2,7 @@ package io.github.wulkanowy.api.repository
 
 import io.github.wulkanowy.api.Api
 import io.github.wulkanowy.api.ApiException
+import io.github.wulkanowy.api.interceptor.VulcanException
 import io.github.wulkanowy.api.login.CertificateResponse
 import io.github.wulkanowy.api.register.HomepageResponse
 import io.github.wulkanowy.api.service.LoginService
@@ -43,6 +44,11 @@ class LoginRepository(
     @Synchronized
     fun login(email: String, password: String): Single<HomepageResponse> {
         return sendCredentials(email, password).flatMap {
+            when {
+                it.title.startsWith("Witryna ucznia i rodzica") -> return@flatMap Single.just(HomepageResponse())
+                it.action.isBlank() -> throw VulcanException("Invalid certificate page: '${it.title}'. Try again")
+            }
+
             sendCertificate(it)
         }
     }

src/test/kotlin/io/github/wulkanowy/api/login/LoginTest.kt

@@ -2,6 +2,8 @@ package io.github.wulkanowy.api.login
 
 import io.github.wulkanowy.api.Api
 import io.github.wulkanowy.api.BaseLocalTest
+import io.github.wulkanowy.api.homework.HomeworkTest
+import io.github.wulkanowy.api.interceptor.VulcanException
 import io.github.wulkanowy.api.register.HomepageResponse
 import io.github.wulkanowy.api.repository.LoginRepository
 import io.github.wulkanowy.api.service.LoginService
@@ -111,4 +113,27 @@ class LoginTest : BaseLocalTest() {
         observer.assertTerminated()
         observer.assertError(AccountPermissionException::class.java)
     }
+
+    @Test
+    fun alreadyLoggedIn() {
+        server.enqueue(MockResponse().setBody(HomeworkTest::class.java.getResource("ZadaniaDomowe.html").readText()))
+        server.start(3000)
+
+        val res = normal.login("jan@fakelog.cf", "jan123")
+        val observer = TestObserver<HomepageResponse>()
+        res.subscribe(observer)
+        observer.assertComplete()
+    }
+
+    @Test
+    fun invalidCertificatePage() {
+        server.enqueue(MockResponse().setBody(LoginTest::class.java.getResource("Offline.html").readText()))
+        server.start(3000)
+
+        val res = normal.login("jan@fakelog.cf", "jan123")
+        val observer = TestObserver<HomepageResponse>()
+        res.subscribe(observer)
+        observer.assertTerminated()
+        observer.assertError(VulcanException::class.java)
+    }
 }