advancedPrivacy: Save trackers file and use it if available

2 files changed, 41 insertions, 11 deletions

diff --git a/app/build.gradle b/app/build.gradle
index f6fecd2..23d6ecd 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -119,7 +119,7 @@ dependencies {
     implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0'
 
     implementation 'com.squareup.retrofit2:retrofit:2.9.0'
-    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
+    implementation 'com.squareup.retrofit2:converter-scalars:2.9.0'
 
     implementation project(":flow-mvi")
     implementation Libs.Kotlin.stdlib
diff --git a/app/src/main/java/foundation/e/privacycentralapp/data/repositories/TrackersRepository.kt b/app/src/main/java/foundation/e/privacycentralapp/data/repositories/TrackersRepository.kt
index 8a7f0a7..2b2c1dd 100644
--- a/app/src/main/java/foundation/e/privacycentralapp/data/repositories/TrackersRepository.kt
+++ b/app/src/main/java/foundation/e/privacycentralapp/data/repositories/TrackersRepository.kt
@@ -22,33 +22,47 @@ import android.util.Log
 import com.google.gson.Gson
 import foundation.e.privacymodules.trackers.Tracker
 import retrofit2.Retrofit
-import retrofit2.converter.gson.GsonConverterFactory
+import retrofit2.converter.scalars.ScalarsConverterFactory
 import retrofit2.http.GET
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileWriter
+import java.io.IOException
 import java.io.InputStreamReader
+import java.io.PrintWriter
 
 class TrackersRepository(private val context: Context) {
 
+    private val eTrackerFileName = "e_trackers.json"
+    private val eTrackerFile = File(context.filesDir.absolutePath, eTrackerFileName)
+
     var trackers: List<Tracker> = emptyList()
         private set
 
     init {
-        initFromAssets()
+        initTrackersFile()
     }
 
     suspend fun update() {
         val api = ETrackersApi.build()
-        val response = api.trackers()
-        trackers = mapper(response)
+        saveData(eTrackerFile, api.trackers())
+        initTrackersFile()
     }
 
-    private fun initFromAssets() {
+    private fun initTrackersFile() {
         try {
-            val reader = InputStreamReader(context.getAssets().open("e_trackers.json"), "UTF-8")
-
+            var inputStream = context.assets.open(eTrackerFileName)
+            if (eTrackerFile.exists()) {
+                inputStream = FileInputStream(eTrackerFile)
+            }
+            val reader = InputStreamReader(inputStream, "UTF-8")
             val trackerResponse =
                 Gson().fromJson(reader, ETrackersApi.ETrackersResponse::class.java)
 
             trackers = mapper(trackerResponse)
+
+            reader.close()
+            inputStream.close()
         } catch (e: Exception) {
             Log.e("TrackersRepository", "While parsing trackers in assets", e)
         }
@@ -64,7 +78,7 @@ class TrackersRepository(private val context: Context) {
         }
     }
 
-    fun ETrackersApi.ETrackersResponse.ETracker.toTracker(): Tracker {
+    private fun ETrackersApi.ETrackersResponse.ETracker.toTracker(): Tracker {
         return Tracker(
             id = id!!,
             hostnames = hostnames!!.toSet(),
@@ -72,6 +86,22 @@ class TrackersRepository(private val context: Context) {
             exodusId = exodusId
         )
     }
+
+    private fun saveData(file: File, data: String): Boolean {
+        try {
+            val fos = FileWriter(file, false)
+            val ps = PrintWriter(fos)
+            ps.apply {
+                print(data)
+                flush()
+                close()
+            }
+            return true
+        } catch (e: IOException) {
+            e.printStackTrace()
+        }
+        return false
+    }
 }
 
 interface ETrackersApi {
@@ -79,14 +109,14 @@ interface ETrackersApi {
         fun build(): ETrackersApi {
             val retrofit = Retrofit.Builder()
                 .baseUrl("https://gitlab.e.foundation/e/os/tracker-list/-/raw/main/")
-                .addConverterFactory(GsonConverterFactory.create())
+                .addConverterFactory(ScalarsConverterFactory.create())
                 .build()
             return retrofit.create(ETrackersApi::class.java)
         }
     }
 
     @GET("list/e_trackers.json")
-    suspend fun trackers(): ETrackersResponse
+    suspend fun trackers(): String
 
     data class ETrackersResponse(val trackers: List<ETracker>) {
         data class ETracker(