Ensure that Element X can use the service from Element Classic.

Permission "im.vector.app.READ_DATA" is not necessary anymore.

features/login/impl/build.gradle.kts

@@ -1,3 +1,4 @@
+import extension.buildConfigFieldStr
 import extension.setupDependencyInjection
 import extension.testCommonDependencies
 
@@ -23,6 +24,29 @@ android {
             isIncludeAndroidResources = true
         }
     }
+
+    buildFeatures {
+        buildConfig = true
+    }
+
+    buildTypes {
+        val elementClassicPackageKey = "elementClassicPackage"
+        val elementClassicPackage = "im.vector.app"
+        val elementClassicPackageDebug = "$elementClassicPackage.debug"
+        val elementClassicPackageNightly = "$elementClassicPackage.nightly"
+        getByName("release") {
+            manifestPlaceholders[elementClassicPackageKey] = elementClassicPackage
+            buildConfigFieldStr(elementClassicPackageKey, elementClassicPackage)
+        }
+        getByName("debug") {
+            manifestPlaceholders[elementClassicPackageKey] = elementClassicPackageDebug
+            buildConfigFieldStr(elementClassicPackageKey, elementClassicPackageDebug)
+        }
+        register("nightly") {
+            manifestPlaceholders[elementClassicPackageKey] = elementClassicPackageNightly
+            buildConfigFieldStr(elementClassicPackageKey, elementClassicPackageNightly)
+        }
+    }
 }
 
 setupDependencyInjection()

features/login/impl/src/main/AndroidManifest.xml

@@ -13,8 +13,9 @@
         <intent>
             <action android:name="android.support.customtabs.action.CustomTabsService" />
         </intent>
+
+        <!-- To be able to start the service exported by Element Classic -->
+        <package android:name="${elementClassicPackage}" />
     </queries>
 
-    <!-- Permission to read data from Element classic -->
-    <uses-permission android:name="im.vector.app.READ_DATA" />
 </manifest>

features/login/impl/src/main/kotlin/io/element/android/features/login/impl/screens/onboarding/classic/ElementClassicConnection.kt

@@ -20,9 +20,8 @@ import android.os.Messenger
 import android.os.RemoteException
 import dev.zacsweers.metro.AppScope
 import dev.zacsweers.metro.ContributesBinding
+import io.element.android.features.login.impl.BuildConfig
 import io.element.android.libraries.core.log.logger.LoggerTag
-import io.element.android.libraries.core.meta.BuildMeta
-import io.element.android.libraries.core.meta.BuildType
 import io.element.android.libraries.di.annotations.AppCoroutineScope
 import io.element.android.libraries.di.annotations.ApplicationContext
 import io.element.android.libraries.matrix.api.core.UserId
@@ -44,7 +43,11 @@ sealed interface ElementClassicConnectionState {
     object Idle : ElementClassicConnectionState
     object ElementClassicNotFound : ElementClassicConnectionState
     object ElementClassicReadyNoSession : ElementClassicConnectionState
-    data class ElementClassicReady(val userId: UserId) : ElementClassicConnectionState
+    data class ElementClassicReady(
+        val userId: UserId,
+        val secrets: String,
+    ) : ElementClassicConnectionState
+
     data class Error(val error: String) : ElementClassicConnectionState
 }
 
@@ -56,7 +59,6 @@ class DefaultElementClassicConnection(
     private val context: Context,
     @AppCoroutineScope
     private val coroutineScope: CoroutineScope,
-    private val buildMeta: BuildMeta,
 ) : ElementClassicConnection {
     // Messenger for communicating with the service.
     private var messenger: Messenger? = null
@@ -101,7 +103,7 @@ class DefaultElementClassicConnection(
             // applications replace our component.
             try {
                 val intentService = Intent()
-                intentService.setComponent(getElementClassicComponent(buildMeta))
+                intentService.setComponent(getElementClassicComponent())
                 if (context.bindService(intentService, serviceConnection, BIND_AUTO_CREATE)) {
                     Timber.tag(loggerTag.value).d("Binding returned true")
                 } else {
@@ -198,17 +200,8 @@ class DefaultElementClassicConnection(
         }
     }
 
-    private fun getElementClassicComponent(buildMeta: BuildMeta) = ComponentName(
-        buildString {
-            append(ELEMENT_CLASSIC_APP_ID)
-            append(
-                when (buildMeta.buildType) {
-                    BuildType.DEBUG -> ELEMENT_CLASSIC_APP_ID_DEBUG_SUFFIX
-                    BuildType.NIGHTLY -> ELEMENT_CLASSIC_APP_ID_NIGHTLY_SUFFIX
-                    BuildType.RELEASE -> ELEMENT_CLASSIC_APP_ID_RELEASE_SUFFIX
-                }
-            )
-        },
+    private fun getElementClassicComponent() = ComponentName(
+        BuildConfig.elementClassicPackage,
         ELEMENT_CLASSIC_SERVICE_FULL_CLASS_NAME,
     )
 
@@ -220,9 +213,14 @@ class DefaultElementClassicConnection(
             if (error != null) {
                 ElementClassicConnectionState.Error(error)
             } else {
-                val userId = getString(KEY_USER_ID_STR)?.let(::UserId)
+                val userId = getString(KEY_USER_ID_STR)?.takeIf { it.isNotEmpty() }?.let(::UserId)
                 if (userId != null) {
-                    ElementClassicConnectionState.ElementClassicReady(userId)
+                    val secrets = getString(KEY_SECRETS_STR)?.takeIf { it.isNotEmpty() }
+                    if (secrets == null) {
+                        ElementClassicConnectionState.Error("No secrets received from Element Classic")
+                    } else {
+                        ElementClassicConnectionState.ElementClassicReady(userId, secrets)
+                    }
                 } else {
                     ElementClassicConnectionState.ElementClassicReadyNoSession
                 }
@@ -232,18 +230,31 @@ class DefaultElementClassicConnection(
 
     // Everything in this companion object must match what is defined in Element Classic
     private companion object {
+        const val ELEMENT_CLASSIC_SERVICE_FULL_CLASS_NAME = "im.vector.app.features.importer.ImporterService"
+
         // Command to the service to get the data.
         const val MSG_GET_DATA = 1
 
-        const val ELEMENT_CLASSIC_APP_ID = "im.vector.app"
-        const val ELEMENT_CLASSIC_APP_ID_DEBUG_SUFFIX = ".debug"
-        const val ELEMENT_CLASSIC_APP_ID_NIGHTLY_SUFFIX = ".nightly"
-        const val ELEMENT_CLASSIC_APP_ID_RELEASE_SUFFIX = ""
-
-        const val ELEMENT_CLASSIC_SERVICE_FULL_CLASS_NAME = "im.vector.app.features.importer.ImporterService"
-
         // Keys for the bundle returned from the service
         const val KEY_ERROR_STR = "error"
         const val KEY_USER_ID_STR = "userId"
+
+        /**
+         * Key to extract the secrets from the bundle, as a Json string.
+         * Json will have this format:
+         * {
+         *   "cross_signing" : {
+         *     "master_key" : "z8RUxnaAGu___REDACTED___k+BQL9o",
+         *     "user_signing_key" : "baJHzA___REDACTED___xMLbSUAXw9QUzqms",
+         *     "self_signing_key" : "DU0CvLtR2G/___REDACTED___dV/MONNq4nsQhM"
+         *   },
+         *   "backup" : {
+         *     "algorithm" : "m.megolm_backup.v1.curve25519-aes-sha2",
+         *     "key" : "VzncmQ+UOV___REDACTED___patxDz7m0Nc",
+         *     "backup_version" : "1"
+         *   }
+         * }
+         */
+        const val KEY_SECRETS_STR = "secrets"
     }
 }