add background grades updates with notify on changed grades

app/build.gradle

@@ -11,8 +11,8 @@ android {
         applicationId "org.mosad.seil0.projectlaogai"
         minSdkVersion 23
         targetSdkVersion 29
-        versionCode 6000 // 0006000
-        versionName "0.6.0"
+        versionCode 6090 // 0006000
+        versionName "0.6.1-beta1"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         resValue "string", "build_time", buildTime()
         setProperty("archivesBaseName", "projectlaogai-$versionName")
@@ -31,6 +31,10 @@ android {
         targetCompatibility JavaVersion.VERSION_1_8
     }
 
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_1_8
+    }
+
     sourceSets {
         main {
             res.srcDirs =
@@ -63,6 +67,8 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
     implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
     implementation 'androidx.security:security-crypto:1.1.0-alpha02'
+    implementation 'androidx.work:work-runtime:2.4.0'
+    implementation "androidx.work:work-runtime-ktx:2.4.0"
     implementation 'com.google.android.material:material:1.2.0'
     implementation 'com.google.code.gson:gson:2.8.6'
     implementation 'com.afollestad:aesthetic:1.0.0-beta05'

app/src/main/java/org/mosad/seil0/projectlaogai/MainActivity.kt

@@ -51,6 +51,7 @@ import org.mosad.seil0.projectlaogai.controller.preferences.Preferences
 import org.mosad.seil0.projectlaogai.controller.preferences.Preferences.cColorAccent
 import org.mosad.seil0.projectlaogai.controller.preferences.Preferences.cColorPrimary
 import org.mosad.seil0.projectlaogai.fragments.*
+import org.mosad.seil0.projectlaogai.util.NotificationUtils
 import kotlin.system.measureTimeMillis
 
 /**
@@ -179,6 +180,7 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
             Preferences.load(this) // load the settings, must be finished before doing anything else
             CacheController(this) // load the cache
             EncryptedPreferences.load(this)
+            NotificationUtils(this)
         }
         Log.i(className, "startup completed in $startupTime ms")
     }

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

@@ -22,14 +22,21 @@
 
 package org.mosad.seil0.projectlaogai.controller
 
+import android.content.Context
+import androidx.work.ExistingPeriodicWorkPolicy
+import androidx.work.PeriodicWorkRequestBuilder
+import androidx.work.WorkManager
+import org.mosad.seil0.projectlaogai.controller.preferences.Preferences
 import org.mosad.seil0.projectlaogai.util.GradeSubject
+import org.mosad.seil0.projectlaogai.worker.GradesUpdateWorker
+import java.util.concurrent.TimeUnit
 
 class GradesController {
 
     /**
      * show the difference between 2 grades sets
      */
-    fun diffGrades(origMap: HashMap<String, ArrayList<GradeSubject>>, diffMap: HashMap<String, ArrayList<GradeSubject>>): ArrayList<GradeSubject> {
+    fun diffGrades(origMap: Map<String, ArrayList<GradeSubject>>, diffMap: Map<String, ArrayList<GradeSubject>>): ArrayList<GradeSubject> {
         val diff = ArrayList<GradeSubject>()
 
         diffMap.values.forEach { semester ->
@@ -54,6 +61,39 @@ class GradesController {
         return diff
     }
 
+    companion object {
 
+        /**
+         * stop the grades background sync, if the sync interval is greater than 0
+         * start it again with the new interval
+         */
+        fun updateBackgroundSync(context: Context) {
+            stopBackgroundSync(context)
 
+            // if interval is not 0, start background Sync
+            if (Preferences.gradesSyncInterval > 0)
+                startBackgroundSync(context)
+        }
+
+        /**
+         * start a new periodic worker GradesUpdateWorker
+         */
+        fun startBackgroundSync(context: Context) {
+            val work = PeriodicWorkRequestBuilder<GradesUpdateWorker>(
+                Preferences.gradesSyncInterval.toLong(),
+                TimeUnit.HOURS
+            ).build()
+
+            val workManager = WorkManager.getInstance(context)
+            workManager.enqueueUniquePeriodicWork("GradesUpdateWorker", ExistingPeriodicWorkPolicy.REPLACE, work)
+        }
+
+        /**
+         * cancel GradesUpdateWorker
+         */
+        fun stopBackgroundSync(context: Context) {
+            WorkManager.getInstance(context).cancelUniqueWork("GradesUpdateWorker")
+        }
+
+    }
 }

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

@@ -215,8 +215,6 @@ class CacheController(cont: Context) {
 
             return GlobalScope.launch(Dispatchers.IO) {
                 if (parser.checkQISPOSStatus() == 200) {
-                    if (file.exists()) { file.delete() }
-
                     // save cache file and update time
                     saveEncrypted(context, file, Gson().toJson(parser.parseGrades()))
                     gradesCacheTime = System.currentTimeMillis() / 1000
@@ -258,8 +256,13 @@ class CacheController(cont: Context) {
                 EncryptedFile.FileEncryptionScheme.AES256_GCM_HKDF_4KB
             ).build()
 
-            encryptedFile.openFileOutput().bufferedWriter().use {
-                it.write(text)
+            // only write one file at a time
+            synchronized(this) {
+                if (file.exists()) { file.delete() }
+
+                encryptedFile.openFileOutput().bufferedWriter().use {
+                    it.write(text)
+                }
             }
         }
 

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

@@ -39,6 +39,7 @@ object Preferences {
     var gradesCacheTime: Long = 0
     var cColorPrimary: Int = Color.parseColor("#009688")
     var cColorAccent: Int = Color.parseColor("#0096ff")
+    var gradesSyncInterval = 0
     var cCourse = Course(
         "https://www.hs-offenburg.de/index.php?id=6627&class=class&iddV=DA64F6FE-9DDB-429E-A677-05D0D40CB636&week=0",
         "AI3"
@@ -132,6 +133,22 @@ object Preferences {
         cColorAccent = colorAccent
     }
 
+    fun saveGradesSync(context: Context, interval: Int) {
+        val sharedPref = context.getSharedPreferences(
+            context.getString(R.string.preference_file_key),
+            Context.MODE_PRIVATE
+        )
+
+        with (sharedPref.edit()) {
+            putInt(context.getString(R.string.save_key_gradesSyncInterval),
+                interval
+            )
+            apply()
+        }
+
+        gradesSyncInterval = interval
+    }
+
     /**
      * save showBuffet
      */
@@ -161,18 +178,18 @@ object Preferences {
         )
 
         // load the update times (cache)
-        coursesCacheTime = sharedPref.getLong(context.getString(
-                R.string.save_key_coursesCacheTime
-            ), 0)
-        mensaCacheTime = sharedPref.getLong(context.getString(
-                R.string.save_key_mensaCacheTime
-            ), 0)
-        timetableCacheTime = sharedPref.getLong(context.getString(
-                R.string.save_key_timetableCacheTime
-            ), 0)
-        gradesCacheTime = sharedPref.getLong(context.getString(
-            R.string.save_key_gradesCacheTime
-        ), 0)
+        coursesCacheTime = sharedPref.getLong(
+            context.getString(R.string.save_key_coursesCacheTime),0
+        )
+        mensaCacheTime = sharedPref.getLong(
+            context.getString(R.string.save_key_mensaCacheTime),0
+        )
+        timetableCacheTime = sharedPref.getLong(
+            context.getString(R.string.save_key_timetableCacheTime),0
+        )
+        gradesCacheTime = sharedPref.getLong(
+            context.getString(R.string.save_key_gradesCacheTime), 0
+        )
 
         // load saved course
         cCourse = Course(
@@ -183,17 +200,22 @@ object Preferences {
         )
 
         // load saved colors
-        cColorPrimary = sharedPref.getInt(context.getString(
-                R.string.save_key_colorPrimary
-            ), cColorPrimary)
-        cColorAccent = sharedPref.getInt(context.getString(
-                R.string.save_key_colorAccent
-            ), cColorAccent)
+        cColorPrimary = sharedPref.getInt(
+            context.getString(R.string.save_key_colorPrimary), cColorPrimary
+        )
+        cColorAccent = sharedPref.getInt(
+            context.getString(R.string.save_key_colorAccent), cColorAccent
+        )
+
+        // load grades sync interval
+        gradesSyncInterval = sharedPref.getInt(
+            context.getString(R.string.save_key_gradesSyncInterval), gradesSyncInterval
+        )
 
         // load showBuffet
-        cShowBuffet = sharedPref.getBoolean(context.getString(
-                R.string.save_key_showBuffet
-            ), true)
+        cShowBuffet = sharedPref.getBoolean(
+            context.getString(R.string.save_key_showBuffet), true
+        )
     }
 
 }

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

@@ -47,6 +47,7 @@ import kotlinx.android.synthetic.main.fragment_settings.*
 import kotlinx.coroutines.*
 import org.mosad.seil0.projectlaogai.BuildConfig
 import org.mosad.seil0.projectlaogai.R
+import org.mosad.seil0.projectlaogai.controller.GradesController
 import org.mosad.seil0.projectlaogai.controller.cache.CacheController
 import org.mosad.seil0.projectlaogai.controller.cache.CacheController.Companion.coursesList
 import org.mosad.seil0.projectlaogai.controller.preferences.Preferences
@@ -74,6 +75,7 @@ class SettingsFragment : Fragment() {
     private lateinit var linLayoutTheme: LinearLayout
     private lateinit var linLayoutPrimaryColor: LinearLayout
     private lateinit var linLayoutAccentColor: LinearLayout
+    private lateinit var linLayoutGradesSync: LinearLayout
     private lateinit var switchBuffet: SwitchCompat
     private lateinit var txtViewCourse: TextView
 
@@ -97,6 +99,7 @@ class SettingsFragment : Fragment() {
         linLayoutTheme = view.findViewById(R.id.linLayout_Theme)
         linLayoutPrimaryColor = view.findViewById(R.id.linLayout_PrimaryColor)
         linLayoutAccentColor = view.findViewById(R.id.linLayout_AccentColor)
+        linLayoutGradesSync = view.findViewById(R.id.linLayout_GradesSync)
         switchBuffet = view.findViewById(R.id.switch_buffet)
 
         // if we call txtView_Course via KAE view binding it'll result in a NPE in the onDismissed call
@@ -108,6 +111,11 @@ class SettingsFragment : Fragment() {
         txtView_User.text = EncryptedPreferences.email.ifEmpty { resources.getString(R.string.sample_user) }
         txtView_Course.text = cCourse.courseName
         txtView_AboutDesc.text =  resources.getString(R.string.about_version, BuildConfig.VERSION_NAME, getString(R.string.build_time))
+        txtView_GradesSyncDesc.text = if (Preferences.gradesSyncInterval == 0) {
+            resources.getString(R.string.grades_sync_desc_never)
+        } else {
+            resources.getString(R.string.grades_sync_desc, Preferences.gradesSyncInterval)
+        }
         switch_buffet.isChecked = cShowBuffet // init switch
 
         val outValue = TypedValue()
@@ -281,6 +289,38 @@ class SettingsFragment : Fragment() {
                 }
         }
 
+        linLayoutGradesSync.setOnClickListener {
+            val items = resources.getStringArray(R.array.syncInterval).toList()
+            val initial = when (Preferences.gradesSyncInterval) {
+                1 -> 1
+                3 -> 2
+                6 -> 3
+                12 -> 4
+                else -> 0
+            }
+
+            MaterialDialog(context!!)
+                .title(R.string.grades_sync)
+                .listItemsSingleChoice(items = items, initialSelection = initial) { _, index, _ ->
+                val interval = when (index) {
+                    1 -> 1
+                    2 -> 3
+                    3 -> 6
+                    4 -> 12
+                    else -> 0
+                }
+
+                Preferences.saveGradesSync(context!!, interval)
+                GradesController.updateBackgroundSync(context!!)
+
+                txtView_GradesSyncDesc.text = if (Preferences.gradesSyncInterval == 0) {
+                    resources.getString(R.string.grades_sync_desc_never)
+                } else {
+                    resources.getString(R.string.grades_sync_desc, Preferences.gradesSyncInterval)
+                }
+            }.show()
+        }
+
         switchBuffet.setOnClickListener {
             Preferences.saveShowBuffet(context!!, switchBuffet.isChecked)
         }

app/src/main/java/org/mosad/seil0/projectlaogai/util/NotificationUtils.kt

@@ -0,0 +1,36 @@
+package org.mosad.seil0.projectlaogai.util
+
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.content.Context
+import android.os.Build
+import androidx.annotation.RequiresApi
+import java.util.concurrent.atomic.AtomicInteger
+
+
+class NotificationUtils(val context: Context) {
+
+    companion object {
+        val CHANNEL_ID_GRADES = "channel_grades"
+
+        val id = AtomicInteger(0)
+
+        fun getId() = id.incrementAndGet()
+    }
+
+    init {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            createNotificationChannel(CHANNEL_ID_GRADES, "Grades Channel", "A Channel")
+        }
+    }
+
+    @RequiresApi(26)
+    private fun createNotificationChannel(channelId: String, name: String, desc: String) {
+        val mChannel = NotificationChannel(channelId, name, NotificationManager.IMPORTANCE_DEFAULT)
+        mChannel.description = desc
+
+        val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+        notificationManager.createNotificationChannel(mChannel)
+    }
+
+}

app/src/main/java/org/mosad/seil0/projectlaogai/worker/GradesUpdateWorker.kt

@@ -0,0 +1,102 @@
+/**
+ * ProjectLaogai
+ *
+ * Copyright 2019-2020  <seil0@mosad.xyz>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ *
+ */
+
+package org.mosad.seil0.projectlaogai.worker
+
+import android.content.Context
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationManagerCompat
+import androidx.work.Worker
+import androidx.work.WorkerParameters
+import kotlinx.coroutines.runBlocking
+import org.mosad.seil0.projectlaogai.R
+import org.mosad.seil0.projectlaogai.controller.GradesController
+import org.mosad.seil0.projectlaogai.controller.cache.CacheController
+import org.mosad.seil0.projectlaogai.controller.preferences.EncryptedPreferences
+import org.mosad.seil0.projectlaogai.util.NotificationUtils
+import org.mosad.seil0.projectlaogai.util.NotificationUtils.Companion.CHANNEL_ID_GRADES
+
+class GradesUpdateWorker(val context: Context, params: WorkerParameters): Worker(context, params) {
+
+    override fun doWork(): Result {
+
+        // check if credentials are present, if not do nothing
+        val credentials = EncryptedPreferences.readCredentials(context)
+        if (credentials.first.isEmpty() || credentials.second.isEmpty()) {
+            return Result.success()
+        }
+
+        // TODO show updating notification, for debugging
+        println("doing work ...")
+        val notificationIdDBG = NotificationUtils.getId()
+        val builderDBG = NotificationCompat.Builder(context, CHANNEL_ID_GRADES)
+            .setSmallIcon(R.drawable.ic_grading_black_24dp)
+            .setContentTitle(context.getString(R.string.notification_grades))
+            .setContentText(context.getString(R.string.notification_grades_updating_desc))
+            .setNotificationSilent()
+        NotificationManagerCompat.from(context).apply {
+            notify(notificationIdDBG, builderDBG.build())
+        }
+
+        // get old grades
+        val oldGrades = CacheController(context).readGrades()
+
+        // get update from qispos
+        runBlocking { CacheController.updateGrades(context).join() }
+        val newGrades = CacheController(context).readGrades()
+
+        // check for changes
+        val diff = GradesController().diffGrades(oldGrades, newGrades)
+
+        // show message
+        if (diff.isNotEmpty()) {
+            val text = if (diff.size < 2) {
+                context.getString(R.string.notification_grades_single_desc, diff.first().name)
+            } else {
+                context.getString(R.string.notification_grades_multiple_desc, diff.first().name, (diff.size - 1))
+            }
+
+            val builder = NotificationCompat.Builder(context, CHANNEL_ID_GRADES)
+                .setSmallIcon(R.drawable.ic_grading_black_24dp)
+                .setContentTitle(context.getString(R.string.notification_grades))
+                .setContentText(text)
+
+            // if there are multiple subjects, use BigText
+            if (diff.size > 1)
+                builder.setStyle(NotificationCompat.BigTextStyle().bigText(text))
+
+            NotificationManagerCompat.from(context).apply {
+                notify(NotificationUtils.getId(), builder.build())
+            }
+        }
+
+        // TODO remove debug notification
+        NotificationManagerCompat.from(context).apply {
+            cancel(notificationIdDBG)
+        }
+
+        return Result.success()
+    }
+
+
+
+}

app/src/main/res/layouts/fragments/layout/fragment_settings.xml

@@ -332,6 +332,34 @@
                             android:layout_height="1dp"
                             android:background="?android:attr/listDivider" />
 
+                        <LinearLayout
+                            android:id="@+id/linLayout_GradesSync"
+                            android:layout_width="match_parent"
+                            android:layout_height="match_parent"
+                            android:layout_margin="7dp"
+                            android:orientation="vertical">
+
+                            <TextView
+                                android:id="@+id/txtView_GradesSync"
+                                android:layout_width="match_parent"
+                                android:layout_height="wrap_content"
+                                android:text="@string/grades_sync"
+                                android:textSize="16sp"
+                                android:textStyle="bold" />
+
+                            <TextView
+                                android:id="@+id/txtView_GradesSyncDesc"
+                                android:layout_width="match_parent"
+                                android:layout_height="wrap_content"
+                                android:text="@string/grades_sync_desc" />
+                        </LinearLayout>
+
+                        <View
+                            android:id="@+id/divider8"
+                            android:layout_width="match_parent"
+                            android:layout_height="1dp"
+                            android:background="?android:attr/listDivider" />
+
                         <androidx.appcompat.widget.SwitchCompat
                             android:id="@+id/switch_buffet"
                             android:layout_width="match_parent"
@@ -340,6 +368,7 @@
                             android:text="@string/show_buffet"
                             android:textSize="16sp"
                             android:textStyle="bold" />
+
                     </LinearLayout>
                 </androidx.cardview.widget.CardView>
             </LinearLayout>

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

@@ -66,6 +66,9 @@
     <string name="primary_color_desc">Zum Ändern tippen, Standard ist Blaugrün.</string>
     <string name="accent_color">Akzentfarbe</string>
     <string name="accent_color_desc">Zum Ändern tippen, Standard ist Hellblau.</string>
+    <string name="grades_sync">Aktualisierungsintervall Noten</string>
+    <string name="grades_sync_desc">%1$d Stunden</string>
+    <string name="grades_sync_desc_never">nie</string>
     <string name="show_buffet">Buffet immer anzeigen</string>
 
     <!-- dialogs -->
@@ -80,6 +83,12 @@
     <string name="mensa_current">aktuell: %1$s\n</string>
     <string name="mensa_last">letzte Abbuchung: %1$s</string>
 
+    <!-- notifications -->
+    <string name="notification_grades">Noten</string>
+    <string name="notification_grades_single_desc">%1$s wurden hinzugefügt oder aktualisiert</string>
+    <string name="notification_grades_multiple_desc">%1$s und %2$d weiter Vorlesungen wurden hinzugefügt oder aktualisiert</string>
+    <string name="notification_grades_updating_desc">Suche nach neuen Noten …</string>
+
     <!-- errors -->
     <string name="error">Fehler</string>
     <string name="timetable_error">Der Stundenplan konnte nicht geladen werden.</string>
@@ -101,4 +110,12 @@
     <string name="shortcut_grades_long">Noten</string>
     <string name="shortcut_grades_disabled">Noten deaktiviert</string>
 
+    <string-array name="syncInterval">
+        <item>Manuell</item>
+        <item>1 Stunde</item>
+        <item>3 Stunden</item>
+        <item>6 Stunden</item>
+        <item>12 Stunden</item>
+    </string-array>
+
 </resources>

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

@@ -71,6 +71,9 @@
     <string name="primary_color_desc">Tap to change, default is teal blue.</string>
     <string name="accent_color">Accent color</string>
     <string name="accent_color_desc">Tap to change, default is light blue.</string>
+    <string name="grades_sync">Update interval grades</string>
+    <string name="grades_sync_desc">%1$d hours</string>
+    <string name="grades_sync_desc_never">never</string>
     <string name="show_buffet">Always show buffet</string>
 
     <!-- dialogs -->
@@ -85,6 +88,12 @@
     <string name="mensa_current">current: %1$s\n</string>
     <string name="mensa_last">last: %1$s</string>
 
+    <!-- notifications -->
+    <string name="notification_grades">Grades</string>
+    <string name="notification_grades_single_desc">%1$s was added or updated</string>
+    <string name="notification_grades_multiple_desc">%1$s and %2$d other subjects have been added or updated</string>
+    <string name="notification_grades_updating_desc">Checking for new grades …</string>
+
     <!-- sample strings -->
     <string name="sample_user" translatable="false">spinefield@stud.hs-offenburg.de</string>
     <string name="sample_course" translatable="false">Everything</string>
@@ -123,6 +132,7 @@
     <string name="save_key_courseTTLink" translatable="false">org.mosad.seil0.projectlaogai.courseTTLink</string>
     <string name="save_key_colorPrimary" translatable="false">org.mosad.seil0.projectlaogai.colorPrimary</string>
     <string name="save_key_colorAccent" translatable="false">org.mosad.seil0.projectlaogai.colorAccent</string>
+    <string name="save_key_gradesSyncInterval" translatable="false">org.mosad.seil0.projectlaogai.gradesSyncInterval</string>
     <string name="save_key_showBuffet" translatable="false">org.mosad.seil0.projectlaogai.showBuffet</string>
     <string name="save_key_coursesCacheTime" translatable="false">org.mosad.seil0.projectlaogai.coursesCacheTime</string>
     <string name="save_key_mensaCacheTime" translatable="false">org.mosad.seil0.projectlaogai.mensaCacheTime</string>
@@ -131,6 +141,13 @@
     <string name="save_key_user_email" translatable="false">org.mosad.seil0.projectlaogai.user_email</string>
     <string name="save_key_user_password" translatable="false">org.mosad.seil0.projectlaogai.user_password</string>
 
+    <string-array name="syncInterval">
+        <item>Manually</item>
+        <item>1 Hour</item>
+        <item>3 Hours</item>
+        <item>6 Hours</item>
+        <item>12 Hours</item>
+    </string-array>
 
     <string-array name="courses">
         <item>AI-1</item>