Filter emojis in RAT profile fields (EXPOSUREAPP-8108) (#3597)

* Create a custom view

* Use extension function instead

* Some Tests

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: Juraj Kusnier <jurajkusnier@users.noreply.github.com>

Corona-Warn-App/src/androidTest/java/de/rki/coronawarnapp/ui/view/EmojiFilterTest.kt

@@ -0,0 +1,52 @@
+package de.rki.coronawarnapp.ui.view
+
+import android.text.SpannableString
+import io.kotest.matchers.shouldBe
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+
+@RunWith(JUnit4::class)
+class EmojiFilterTest {
+
+    private val testData = mapOf<CharSequence, CharSequence?>(
+        "Pneumonoultramicroscopicsilicovolcanoconiosis" to null, // English
+        "Donaudampfschifffahrtselektrizitätenhauptbetriebswerkbauunterbeamtengesellschaft" to null, // German
+        "Muvaffakiyetsizleştiricileştiriveremeyebileceklerimizdenmişsinizcesine" to null, // Turkish
+        "Рентгеноэлектрокардиографический" to null, // Russian
+        "speciallægepraksisplanlægningsstabiliseringsperiode" to null, // Danish
+        "Непротивоконституционствувателствувайте" to null, // Bulgarian
+        "Dziewięćsetdziewięćdziesięciodziewięcionarodowościowego" to null, // Polish
+        "Pneumoultramicroscopicossilicovulcanoconiótico" to null, // Portuguese
+        "paraskevidékatriaphobie" to null, // French
+        "peruspalveluliikelaitoskuntayhtymä" to null, // Finnish
+        "Arquitectónicamente" to null, // Spanish
+        "znajneprekryštalizovávateľnejšievajúcimi" to null, // Slovak
+        // Swedish
+        "Spårvagnsaktiebolagsskensmutsskjutarefackföreningspersonalbeklädnadsmagasinsförråd-sförvaltarens" to null,
+        // Hungarian
+        "legösszetettebbszóhosszúságvilágrekorddöntéskényszerneurózistünetegyüttesmegnyilvá-nulásfejleszthetőségvizsgálataitokként" to null,
+        "nebeprisikiškiakopūstlapiaujančiuosiuose" to null, // Lithuanian
+        "וכשבהשתעשעויותיהם" to null, // Hebrew
+        "ηλεκτροεγκεφαλογραφήματος" to null, // Greek
+        "prijestolonasljednikovičičinima" to null, // Croatian
+        "Sünnipäevanädalalõpupeopärastlõunaväsimatus" to null, // Estonian
+        "أفاستسقيناكموها" to null, // Arabic,
+        "✌️✌️✌️✌️✌️✌️✌️✌️✌️️" to "", // Emoji,
+        "☕☕☕☕☕☕☕☕☕" to "", // Emoji,
+    )
+
+    @Test
+    fun filter() {
+        testData.forEach { (input, output) ->
+            EmojiFilter().filter(
+                input,
+                0,
+                input.length,
+                SpannableString(input),
+                0,
+                input.length
+            ) shouldBe output
+        }
+    }
+}

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/ui/coronatest/rat/profile/create/RATProfileCreateFragment.kt

@@ -8,6 +8,7 @@ import com.google.android.material.datepicker.MaterialDatePicker
 import de.rki.coronawarnapp.R
 import de.rki.coronawarnapp.contactdiary.util.hideKeyboard
 import de.rki.coronawarnapp.databinding.RatProfileCreateFragmentBinding
+import de.rki.coronawarnapp.ui.view.addEmojiFilter
 import de.rki.coronawarnapp.util.TimeAndDateExtensions.toDayFormat
 import de.rki.coronawarnapp.util.di.AutoInject
 import de.rki.coronawarnapp.util.ui.doNavigate
@@ -36,8 +37,8 @@ class RATProfileCreateFragment : Fragment(R.layout.rat_profile_create_fragment),
             }
 
             // Full name
-            firstNameInputEdit.doAfterTextChanged { viewModel.firstNameChanged(it.toString()) }
-            lastNameInputEdit.doAfterTextChanged { viewModel.lastNameChanged(it.toString()) }
+            firstNameInputEdit.addEmojiFilter().doAfterTextChanged { viewModel.firstNameChanged(it.toString()) }
+            lastNameInputEdit.addEmojiFilter().doAfterTextChanged { viewModel.lastNameChanged(it.toString()) }
 
             // Birth date
             birthDateInputEdit.setOnClickListener { openDatePicker() }
@@ -48,15 +49,15 @@ class RATProfileCreateFragment : Fragment(R.layout.rat_profile_create_fragment),
             }
 
             // Address
-            streetInputEdit.doAfterTextChanged { viewModel.streetChanged(it.toString()) }
+            streetInputEdit.addEmojiFilter().doAfterTextChanged { viewModel.streetChanged(it.toString()) }
+            cityInputEdit.addEmojiFilter().doAfterTextChanged { viewModel.cityChanged(it.toString()) }
             zipCodeInputEdit.doAfterTextChanged { viewModel.zipCodeChanged(it.toString()) }
-            cityInputEdit.doAfterTextChanged { viewModel.cityChanged(it.toString()) }
 
             // Phone
             phoneInputEdit.doAfterTextChanged { viewModel.phoneChanged(it.toString()) }
 
             // E-mail
-            emailInputEdit.doAfterTextChanged { viewModel.emailChanged(it.toString()) }
+            emailInputEdit.addEmojiFilter().doAfterTextChanged { viewModel.emailChanged(it.toString()) }
 
             viewModel.profile.observe(viewLifecycleOwner) {
                 profileSaveButton.isEnabled = it?.isValid == true

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/ui/view/EmojiFilter.kt

@@ -0,0 +1,32 @@
+package de.rki.coronawarnapp.ui.view
+
+import android.text.InputFilter
+import android.text.Spanned
+import com.google.android.material.textfield.TextInputEditText
+import java.lang.Character.OTHER_SYMBOL
+import java.lang.Character.SURROGATE
+
+/**
+ * Adds [InputFilter] of emojis ,returns same [TextInputEditText]
+ */
+fun TextInputEditText.addEmojiFilter(): TextInputEditText {
+    filters += EmojiFilter()
+    return this
+}
+
+class EmojiFilter : InputFilter {
+    override fun filter(
+        source: CharSequence,
+        sStart: Int,
+        sEnd: Int,
+        destination: Spanned,
+        dStart: Int,
+        dEnd: Int
+    ): CharSequence? {
+        for (index in sStart until sEnd) {
+            val type = Character.getType(source[index]).toByte()
+            if (type in listOf(SURROGATE, OTHER_SYMBOL)) return ""
+        }
+        return null
+    }
+}