EN: Add database export feature. Only exports the advertisements table.

play-services-nearby-core-ui/src/main/kotlin/org/microg/gms/nearby/core/ui/ExposureNotificationsRpisFragment.kt

@@ -24,6 +24,7 @@ class ExposureNotificationsRpisFragment : PreferenceFragmentCompat() {
     private lateinit var histogramCategory: PreferenceCategory
     private lateinit var histogram: BarChartPreference
     private lateinit var deleteAll: Preference
+    private lateinit var exportDb: Preference
 
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         addPreferencesFromResource(R.xml.preferences_exposure_notifications_rpis)
@@ -33,6 +34,7 @@ class ExposureNotificationsRpisFragment : PreferenceFragmentCompat() {
         histogramCategory = preferenceScreen.findPreference("prefcat_exposure_rpi_histogram") ?: histogramCategory
         histogram = preferenceScreen.findPreference("pref_exposure_rpi_histogram") ?: histogram
         deleteAll = preferenceScreen.findPreference("pref_exposure_rpi_delete_all") ?: deleteAll
+        exportDb = preferenceScreen.findPreference("pref_exposure_export_database") ?: exportDb
         deleteAll.onPreferenceClickListener = Preference.OnPreferenceClickListener {
             AlertDialog.Builder(requireContext())
                     .setTitle(R.string.pref_exposure_rpi_delete_all_title)
@@ -48,6 +50,10 @@ class ExposureNotificationsRpisFragment : PreferenceFragmentCompat() {
                     .show()
             true
         }
+        exportDb.onPreferenceClickListener = Preference.OnPreferenceClickListener {
+            ExposureDatabase.export(requireContext())
+            true
+        }
     }
 
     override fun onResume() {

play-services-nearby-core-ui/src/main/res/values-de/strings.xml

@@ -33,6 +33,8 @@
     <string name="pref_exposure_rpi_delete_all_title">Alle gesammelten IDs löschen</string>
     <string name="pref_exposure_rpi_delete_all_warning">Nach dem Löschen der gesammelten IDs kannst du nicht mehr informiert werden, falls einer deiner Kontakte der letzten 14 Tage positiv getested wurde.</string>
     <string name="pref_exposure_rpi_delete_all_warning_confirm_button">Trotzdem löschen</string>
+    <string name="pref_exposure_rpi_export_title">Datenbank Export</string>
+    <string name="pref_exposure_rpi_export_summary">Exportiere die aktuelle Datenbank um sie mit einer anderen App zu analysieren.</string>
     <string name="pref_exposure_info_summary">"Die Exposure Notifications API ermöglicht es Apps, dich zu warnen, falls du Kontakt zu einer positiv getesteten Person hattest.
 
 Das Datum, die Zeitdauer und die Signalstärke, die dem Kontakt zugeordnet sind, werden mit der zugehörigen App geteilt."</string>

play-services-nearby-core-ui/src/main/res/values/strings.xml

@@ -43,6 +43,8 @@
     <string name="pref_exposure_rpi_delete_all_title">Delete all collected IDs</string>
     <string name="pref_exposure_rpi_delete_all_warning">Deleting collected IDs will make it impossible to notify you in case any of your contacts of the last 14 days is diagnosed.</string>
     <string name="pref_exposure_rpi_delete_all_warning_confirm_button">Delete anyways</string>
+    <string name="pref_exposure_rpi_export_title">Export Database</string>
+    <string name="pref_exposure_rpi_export_summary">Export the current database for analysis with another app.</string>
     <string name="pref_exposure_info_summary">"Exposure Notifications API allows apps to notify you if you were exposed to someone who reported to be diagnosed positive.
 
 The date, duration, and signal strength associated with an exposure will be shared with the corresponding app."</string>

play-services-nearby-core-ui/src/main/res/xml/preferences_exposure_notifications_rpis.xml

@@ -18,6 +18,12 @@
             android:key="pref_exposure_rpi_delete_all"
             android:title="@string/pref_exposure_rpi_delete_all_title" />
     </PreferenceCategory>
+    <PreferenceCategory android:layout="@layout/preference_category_no_label">
+        <Preference
+            android:key="pref_exposure_export_database"
+            android:title="@string/pref_exposure_rpi_export_title"
+            android:summary="@string/pref_exposure_rpi_export_summary" />
+    </PreferenceCategory>
     <PreferenceCategory android:layout="@layout/preference_category_no_label">
         <org.microg.gms.ui.TextPreference
             android:icon="@drawable/ic_info_outline"

play-services-nearby-core/src/main/AndroidManifest.xml

@@ -42,5 +42,15 @@
                 <action android:name="android.intent.action.PACKAGE_RESTARTED" />
             </intent-filter>
         </receiver>
+
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="org.microg.gms.nearby.exposurenotification.export"
+            android:grantUriPermissions="true"
+            android:exported="false">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/preferences_exposure_notifications_exportedfiles" />
+        </provider>
     </application>
 </manifest>

play-services-nearby-core/src/main/kotlin/org/microg/gms/nearby/exposurenotification/ExposureDatabase.kt

@@ -8,13 +8,17 @@ package org.microg.gms.nearby.exposurenotification
 import android.annotation.TargetApi
 import android.content.ContentValues
 import android.content.Context
+import android.content.Intent
 import android.database.sqlite.SQLiteCursor
 import android.database.sqlite.SQLiteDatabase
 import android.database.sqlite.SQLiteDatabase.CONFLICT_IGNORE
 import android.database.sqlite.SQLiteOpenHelper
+import android.net.Uri
 import android.os.Parcel
 import android.os.Parcelable
 import android.util.Log
+import androidx.core.content.FileProvider
+import com.google.android.gms.nearby.exposurenotification.CalibrationConfidence
 import com.google.android.gms.nearby.exposurenotification.DiagnosisKeysDataMapping
 import com.google.android.gms.nearby.exposurenotification.ExposureConfiguration
 import com.google.android.gms.nearby.exposurenotification.TemporaryExposureKey
@@ -964,6 +968,53 @@ class ExposureDatabase private constructor(private val context: Context) : SQLit
             }
         }
 
+        fun export(context: Context) {
+            // FileProvider cannot directly access /databases, so we have to copy the database first
+            // In addition, we filter out only the Advertisements table to not export sensitive TEKs
+
+            // Create a new database which will store only the Advertisements table
+            val exportDir = File(context.getCacheDir(), "exposureDatabase")
+            exportDir.mkdir()
+            val exportFile = File(exportDir, "database.db")
+            if (exportFile.delete()) {
+                Log.d("EN-DB-Exporter", "Deleted old export database.")
+            }
+            val db = SQLiteDatabase.openOrCreateDatabase(exportFile, null)
+
+            // Attach the full database to the new empty db
+            val databaseFile = context.getDatabasePath(DB_NAME);
+            db.execSQL("ATTACH '$databaseFile' AS fulldb;")
+
+            // copy TABLE_ADVERTISEMENTS over
+            db.execSQL("CREATE TABLE $TABLE_ADVERTISEMENTS AS SELECT * FROM fulldb.$TABLE_ADVERTISEMENTS;")
+
+            // Detach original db, close new db
+            db.execSQL("DETACH DATABASE fulldb;")
+            db.close()
+
+            // Use the FileProvider to get a content URI for the new DB
+            val fileUri: Uri? = try {
+                FileProvider.getUriForFile(context,"org.microg.gms.nearby.exposurenotification.export", exportFile)
+            } catch (e: IllegalArgumentException) {
+                Log.e("EN-DB-Exporter", "The database file can't be shared: $exportFile $e")
+                null
+            }
+
+            // Open a sharesheet
+            if (fileUri != null) {
+                // Grant temporary read permission to the content URI
+                val sendIntent: Intent = Intent().apply {
+                    action = Intent.ACTION_SEND
+                    putExtra(Intent.EXTRA_STREAM, fileUri)
+                    addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                    type = "application/vnd.sqlite3"
+                }
+
+                val shareIntent = Intent.createChooser(sendIntent, null)
+                context.startActivity(shareIntent)
+            }
+        }
+
         @Deprecated(message = "Sync database access is slow", replaceWith = ReplaceWith("with(context, call)"))
         fun <T> withSync(context: Context, call: (ExposureDatabase) -> T): T {
             val it = runBlocking { ref(context) }

play-services-nearby-core/src/main/res/xml/preferences_exposure_notifications_exportedfiles.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths>
+    <cache-path name="exposureDatabase" path="exposureDatabase" />
+</paths>