check qispos status and show message if unavailable

app/src/main/java/org/mosad/seil0/projectlaogai/controller/QISPOSParser.kt

@@ -27,6 +27,7 @@ import android.util.Log
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.withContext
+import org.jsoup.HttpStatusException
 import org.jsoup.Jsoup
 import org.jsoup.nodes.Element
 import org.mosad.seil0.projectlaogai.R
@@ -51,6 +52,34 @@ class QISPOSParser(val context: Context) {
     private val baseURL = "https://notenverwaltung.hs-offenburg.de"
     private val loginPath = "/qispos/rds?state=user&type=1&category=auth.login&startpage=portal.vm&breadCrumbSource=portal"
 
+    /**
+     * check if qispos is available
+     * @return a http status code, 999 if no HttpStatusException supplied
+     */
+    fun checkQISPOSStatus(): Int {
+        return runBlocking {
+            withContext(Dispatchers.IO) {
+                val socketFactory = createSSLSocketFactory()
+
+                try {
+                    val res = Jsoup.connect(baseURL + loginPath)
+                        .sslSocketFactory(socketFactory)
+                        .followRedirects(true)
+                        .referrer("https://notenverwaltung.hs-offenburg.de/qispos/rds?state=user&type=0")
+                        .execute()
+
+                    res.statusCode()
+                } catch (exHttp: HttpStatusException) {
+                    exHttp.statusCode
+                } catch (ex: Exception) {
+                    Log.e(className, "Error while checking status", ex)
+                    999
+                }
+
+            }
+        }
+    }
+
     /**
      * parse the html from readGrades()
      * @return a SortedMap, each entry is a semester, each semester has a ArrayList with subjects

app/src/main/java/org/mosad/seil0/projectlaogai/fragments/GradesFragment.kt

@@ -22,18 +22,17 @@
 
 package org.mosad.seil0.projectlaogai.fragments
 
+import android.graphics.Rect
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.TextView
+import androidx.core.content.res.ResourcesCompat
 import androidx.fragment.app.Fragment
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
 import kotlinx.android.synthetic.main.fragment_grades.*
-import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.*
-import kotlinx.coroutines.GlobalScope
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
 import org.mosad.seil0.projectlaogai.R
 import org.mosad.seil0.projectlaogai.controller.QISPOSParser
 import org.mosad.seil0.projectlaogai.controller.preferences.EncryptedPreferences
@@ -49,19 +48,27 @@ class GradesFragment : Fragment() {
 
     private lateinit var refreshLayoutGrades: SwipeRefreshLayout
 
+    private lateinit var parser: QISPOSParser
+
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
         val view: View = inflater.inflate(R.layout.fragment_grades, container, false)
 
         refreshLayoutGrades = view.findViewById(R.id.refreshLayout_Grades)
         refreshLayoutGrades.isEnabled = false // disable swipe
 
-        if (checkCredentials()) {
+        parser = QISPOSParser(context!!)// init the parser
+
+        return view
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        if (checkCredentials() && checkQisposStatus()) {
             GlobalScope.launch(Dispatchers.Default) {
                 addGrades()
             }
         }
-
-        return view
     }
 
     /**
@@ -92,13 +99,35 @@ class GradesFragment : Fragment() {
         return credentialsPresent
     }
 
+    /**
+     * check if qispos is available, if not show an error
+     */
+    private fun checkQisposStatus(): Boolean {
+        val statusCode = parser.checkQISPOSStatus()
+
+        val infoText = resources.getString(when(statusCode) {
+            503 -> R.string.qispos_unavailable
+            else -> R.string.qispos_generic_error
+        })
+
+        val img = ResourcesCompat.getDrawable(resources, R.drawable.ic_error_outline_black_24dp, null)?.apply {
+            bounds = Rect(0, 0, 75, 75)
+        }
+
+        txtView_Loading?.apply {
+            text = infoText
+            setCompoundDrawables(null, null, null, img)
+        }
+
+        return statusCode == 200
+    }
+
     // add the grades to the layout, async
     private fun addGrades() = GlobalScope.launch(Dispatchers.Default) {
         withContext(Dispatchers.Main) {
             refreshLayout_Grades.isRefreshing = true
         }
 
-        val parser = QISPOSParser(context!!)
         val grades = parser.parseGrades()
 
         withContext(Dispatchers.Main) {
@@ -137,7 +166,7 @@ class GradesFragment : Fragment() {
                 // disable sub-subject if not set
                 if (subSubject == null)
                     subjectLayout.disableSubSubject()
-                
+
                 // disable divider if last element
                 if (index == semester.value.lastIndex || semester.value.indexOf(subSubject) == semester.value.lastIndex)
                     subjectLayout.disableDivider()
@@ -151,6 +180,8 @@ class GradesFragment : Fragment() {
             }
         }
 
+
+
         val txtViewLegal = TextView(context).apply {
             text = resources.getString(R.string.without_guarantee)
             textAlignment = View.TEXT_ALIGNMENT_CENTER

app/src/main/res/drawable/ic_error_outline_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:pathData="M11,15h2v2h-2zM11,7h2v6h-2zM11.99,2C6.47,2 2,6.48 2,12s4.47,10 9.99,10C17.52,22 22,17.52 22,12S17.52,2 11.99,2zM12,20c-4.42,0 -8,-3.58 -8,-8s3.58,-8 8,-8 8,3.58 8,8 -3.58,8 -8,8z"
+      android:fillColor="#000000"/>
+</vector>

app/src/main/res/values-de-rDE/strings.xml

@@ -42,6 +42,8 @@
     <!-- fragment_grades -->
     <string name="loading_from_hs">Lade Daten von den Hochschul Servern.\nDas kann eine Weile dauern.</string>
     <string name="credentials_missing">Diese Funktion benötigt deine Login-Daten. Bitte logge dich über die Einstellungen ein.</string>
+    <string name="qispos_unavailable">Die Notenverwaltung ist zur Zeit nicht ereichbar.\nVersuche es später noch einmal.\n</string>
+    <string name="qispos_generic_error">Error.\nVersuche es später noch einmal.\n</string>
     <string name="without_guarantee">Alle Angaben ohne Gewähr.</string>
 
     <!-- fragment_settings -->

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

@@ -22,7 +22,7 @@
     <string name="course_heading">Course</string>
     <string name="course_desc_on">Select your current course.\nAdditional lessons can be added later.</string>
     <string name="login_heading">Login</string>
-    <string name="login_desc_on">Project Laogai can connect to the HIS Online-Portal. Your Login-Data will be stored encrypted on your device. This feature is provided "as is", without any guarantee.</string>
+    <string name="login_desc_on">Project Laogai can connect to the Qispos Online-Portal. Your Login-Data will be stored encrypted on your device. This feature is provided "as is", without any guarantee.</string>
     <string name="email">E-Mail</string>
     <string name="password">Password</string>
     <string name="login">login</string>
@@ -44,6 +44,8 @@
     <!-- fragment_grades -->
     <string name="loading_from_hs">Loading data from the university servers.\nThis may take a while.</string>
     <string name="credentials_missing">This feature needs your Login-Data to work. Please login via the settings.</string>
+    <string name="qispos_unavailable">The Qispos server is currently unavailable.\nPlease try again later.\n</string>
+    <string name="qispos_generic_error">Error.\nPlease try again later.\n</string>
     <string name="without_guarantee">All information is supplied without guarantee.</string>
 
     <!-- fragment_settings -->