Encapsulated session logic

app/src/main/java/io/elixxir/dapp/session/data/Session.kt

+package io.elixxir.dapp.session.data
+
+import android.app.Application
+import bindings.AuthCallbacks
+import timber.log.Timber
+import java.io.File
+import bindings.Bindings
+import bindings.Cmix
+import io.elixxir.dapp.session.models.*
+import kotlinx.coroutines.*
+
+interface Session {
+    val sessionFolder: File
+}
+
+class DAppSession private constructor(
+    private val app: Application,
+    private val defaultDispatcher: CoroutineDispatcher = Dispatchers.IO
+) : Session {
+    override val sessionFolder: File = File(app.filesDir, "cmix/session")
+
+    private fun createSessionFolder(): File {
+        return sessionFolder.apply {
+            if (exists()) {
+                Timber.v("Bindings folder from previous installation was found.")
+                Timber.v("It contains ${listFiles()?.size ?: 0} files.")
+                Timber.v("Deleting!")
+                deleteRecursively()
+            }
+            mkdir()
+            Timber.v("Bindings folder was successfully created at: $absolutePath")
+        }
+    }
+
+    private fun newCmix(
+        ndfJson: String,
+        sessionFolderPath: String,
+        sessionPassword: SessionPassword,
+        registrationCode: String
+    ) {
+        Bindings.newCmix(
+            ndfJson,
+            sessionFolderPath,
+            sessionPassword.value,
+            registrationCode
+        )
+    }
+
+    private suspend fun loadCmix(
+        sessionFolderPath: String,
+        sessionPassword: SessionPassword,
+        cmixParamsJson: E2eParams
+    ): CmixMediator = withContext(defaultDispatcher) {
+        CmixMediator(
+            Bindings.loadCmix(sessionFolderPath, sessionPassword.value, cmixParamsJson.value)
+        )
+    }
+
+    private fun login(
+        cmixId: Long,
+        authCallbacks: AuthCallbacks,
+        identity: ReceptionIdentity,
+        e2eParamsJson: E2eParams
+    ): E2eMediator {
+        return E2eMediator(
+            Bindings.login(cmixId, authCallbacks, identity.value, e2eParamsJson.value)
+        )
+    }
+
+    private fun createIdentity(): ReceptionIdentity {
+        return ReceptionIdentity(
+            Cmix().makeReceptionIdentity()
+        )
+    }
+
+    companion object {
+        internal fun newInstance(
+            app: Application,
+            environment: Environment,
+            defaultDispatcher: CoroutineDispatcher = Dispatchers.IO
+        ) = DAppSession(app, defaultDispatcher)
+    }
+}
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