fix: prevent app crash by not parsing non-json responses

app/src/main/java/com/illusionman1212/lyricsgrabbr/data/HomeRepository.kt

@@ -10,6 +10,7 @@ import com.illusionman1212.lyricsgrabbr.utils.await
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
 import okio.IOException
+import org.jsoup.SerializationException
 import java.net.SocketTimeoutException
 
 @Serializable
@@ -31,7 +32,7 @@ class HomeRepository(private val context: Context) {
         return pkgs.contains(packageName)
     }
 
-    suspend fun makeSearchRequest(song: String, artist: String): Pair<String?, Boolean> {
+    suspend fun makeSearchRequest(lContext: Context, song: String, artist: String): Pair<String?, Boolean> {
         val builder = Uri.Builder()
         val url = builder.scheme("https")
             .authority("api.illusionman1212.com")
@@ -47,11 +48,23 @@ class HomeRepository(private val context: Context) {
             ).await()
 
             if (!res.isSuccessful) {
-                val errRes = json.decodeFromString(ErrorResponse.serializer(), res.body!!.string())
+                if (res.code >= 500) {
+                    return Pair(lContext.resources.getString(R.string.internal_server_error), false)
+                }
 
-                // matches is only null if there's an error. otherwise it's 0 when there are no results
-                if (errRes.matches == null) {
-                    return Pair(context.resources.getString(R.string.generic_error), false)
+                if (res.body?.contentType()?.type != "text" && res.body?.contentType()?.subtype != "json") {
+                    return Pair(lContext.resources.getString(R.string.invalid_json), false)
+                }
+
+                try {
+                    val errRes = json.decodeFromString(ErrorResponse.serializer(), res.body!!.string())
+
+                    // matches is only null if there's an error. otherwise it's 0 when there are no results
+                    if (errRes.matches == null) {
+                        return Pair(lContext.resources.getString(R.string.generic_error), false)
+                    }
+                } catch (e: IllegalArgumentException) {
+                    return Pair(lContext.resources.getString(R.string.failed_to_map_json), false)
                 }
 
                 return Pair(null, false)
@@ -60,10 +73,10 @@ class HomeRepository(private val context: Context) {
             return Pair(res.body?.string(), true)
         } catch (e: IOException) {
             if (e.cause is SocketTimeoutException) {
-                return Pair(context.resources.getString(R.string.timeout), false)
+                return Pair(lContext.resources.getString(R.string.timeout), false)
             }
 
-            return Pair(context.resources.getString(R.string.generic_error), false)
+            return Pair(lContext.resources.getString(R.string.generic_error), false)
         }
     }
 }

app/src/main/java/com/illusionman1212/lyricsgrabbr/ui/screens/Home.kt

@@ -155,7 +155,7 @@ fun HomePage(
         if (song != null && song.title != uiState.notification?.title && song.artist != uiState.notification?.artist) {
             homeViewModel.setSong(song)
 
-            homeViewModel.makeRequestToGenius(song.title, song.artist)
+            homeViewModel.makeRequestToGenius(context, song.title, song.artist)
         }
     }
 
@@ -305,7 +305,7 @@ fun HomePage(
                                         )
                                         FilledTonalButton(
                                             onClick = {
-                                                homeViewModel.makeRequestToGenius(song.title, song.artist)
+                                                homeViewModel.makeRequestToGenius(context, song.title, song.artist)
                                             }
                                         ) {
                                             Text(stringResource(id = R.string.retry))

app/src/main/java/com/illusionman1212/lyricsgrabbr/viewmodels/HomeViewModel.kt

@@ -1,5 +1,6 @@
 package com.illusionman1212.lyricsgrabbr.viewmodels
 
+import android.content.Context
 import android.net.Uri
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
@@ -101,12 +102,12 @@ class HomeViewModel(private val homeRepository: HomeRepository): ViewModel() {
         }
     }
 
-    fun makeRequestToGenius(song: String, artist: String) {
+    fun makeRequestToGenius(context: Context, song: String, artist: String) {
         viewModelScope.launch {
             _uiState.update { HomeState(true, uiState.value.results, uiState.value.notification, null) }
 
             withContext(Dispatchers.IO) {
-                val (res, isSuccess) = homeRepository.makeSearchRequest(song, artist)
+                val (res, isSuccess) = homeRepository.makeSearchRequest(context, song, artist)
                 if (isSuccess) {
                     val results = json.decodeFromString(SearchResultsResponse.serializer(), res!!).all.map {
                         SearchResult(

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

@@ -7,6 +7,9 @@
     <string name="cancel">إلغاء</string>
     <string name="timeout">لقد انتهت مهلة الطلب، حاول مرة أخرى لاحقًا</string>
     <string name="generic_error">لقد حدث خطأ، حاول مرة أخرى لاحقاً</string>
+    <string name="internal_server_error">تأكد من تشغيل خادم geniURL الخاص بك إذا كنت تستضيف ذاتيًا أو اتصل بمضيفك.</string>
+    <string name="invalid_json">الاستجابة لم تكن JSON صالحة</string>
+    <string name="failed_to_map_json">فشل تعيين JSON المفكك إلى النوع الداخلي</string>
     <string name="retry">أعد المحاولة</string>
 
     <!--  Home  -->

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

@@ -6,6 +6,9 @@
     <string name="cancel">Cancel</string>
     <string name="timeout">Request has timed out, try again later</string>
     <string name="generic_error">An error has occurred, try again later</string>
+    <string name="internal_server_error">Internal server error. Make sure your geniURL server is running if self-hosting or contact your hoster.</string>
+    <string name="invalid_json">Response was not valid JSON</string>
+    <string name="failed_to_map_json">Failed to map decoded JSON to internal type.</string>
     <string name="retry">Retry</string>
 
     <!--  Home  -->