Integrate with Telegram's API

app/src/main/AndroidManifest.xml

@@ -2,6 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
+    <uses-permission android:name="android.permission.INTERNET" />
+
     <application
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
@@ -29,4 +31,4 @@
         </activity>
     </application>
 
-</manifest>
+</manifest>

app/src/main/java/dev/lonami/talaria/MainActivity.kt

@@ -7,6 +7,7 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Surface
 import androidx.compose.ui.Modifier
+import dev.lonami.talaria.bindings.Native
 import dev.lonami.talaria.ui.theme.TalariaTheme
 
 class MainActivity : ComponentActivity() {
@@ -23,5 +24,7 @@ class MainActivity : ComponentActivity() {
                 }
             }
         }
+
+        Native.initClient()
     }
 }

app/src/main/java/dev/lonami/talaria/TalariaApp.kt

@@ -5,8 +5,7 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.material.*
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowBack
-import androidx.compose.runtime.Composable
+import androidx.compose.runtime.*
-import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.navigation.compose.NavHost
@@ -47,6 +46,8 @@ fun TalariaApp() {
     val currentScreen =
         TalariaScreen.valueOf(backStackEntry?.destination?.route ?: TalariaScreen.Login.name)
 
+    var selectedDialog by remember { mutableStateOf("") }
+
     Scaffold(
         topBar = {
             TalariaAppBar(
@@ -58,16 +59,17 @@ fun TalariaApp() {
     ) { innerPadding ->
         NavHost(
             navController = navController,
-            startDestination = TalariaScreen.Dialog.name,
+            startDestination = TalariaScreen.Login.name,
             Modifier.padding(innerPadding)
         ) {
             composable(route = TalariaScreen.Dialog.name) {
                 DialogScreen(onDialogSelected = {
+                    selectedDialog = it
                     navController.navigate(TalariaScreen.Chat.name)
                 })
             }
             composable(route = TalariaScreen.Chat.name) {
-                ChatScreen()
+                ChatScreen(selectedDialog)
             }
             composable(route = TalariaScreen.Login.name) {
                 LoginScreen(onConfirmOtp = {

app/src/main/java/dev/lonami/talaria/bindings/Native.kt

@@ -0,0 +1,18 @@
+package dev.lonami.talaria.bindings
+
+object Native {
+    init {
+        System.loadLibrary("talaria")
+    }
+
+    external fun initClient()
+    external fun needLogin(): Boolean
+    external fun requestLoginCode(phone: String): Long
+    external fun signIn(tokenPtr: Long, code: String)
+    external fun getDialogs(): Long
+    external fun dialogCount(dialogsPtr: Long): Int
+    external fun dialogPacked(dialogsPtr: Long, index: Int): String
+    external fun dialogTitle(dialogsPtr: Long, index: Int): String
+    external fun freeDialogs(dialogsPtr: Long)
+    external fun sendMessage(packed: String, text: String)
+}

app/src/main/java/dev/lonami/talaria/data/DialogSource.kt

@@ -1,20 +1,25 @@
 package dev.lonami.talaria.data
 
+import dev.lonami.talaria.bindings.Native
 import dev.lonami.talaria.model.Dialog
 
 object DialogSource {
     fun loadDialogs(): List<Dialog> {
-        return listOf(
+        val dialogs = mutableListOf<Dialog>()
-            Dialog("Saved Messages", "Secret launch-code: banana", pinned = true),
+
-            Dialog("First Sample Dialog", "Photo", pinned = false),
+        val dialogPtr = Native.getDialogs()
-            Dialog("Second Sample Dialog", "Video", pinned = false),
+        val dialogCount = Native.dialogCount(dialogPtr)
-            Dialog("Third Sample Dialog", "Audio", pinned = false),
+        for (i in 0 until dialogCount) {
-            Dialog("Fourth Sample Dialog", "Sticker (just kidding who uses that)", pinned = false),
+            dialogs.add(
-            Dialog("Fifth Sample Dialog", "Photo", pinned = false),
+                Dialog(
-            Dialog("Sixth Sample Dialog", "Video", pinned = false),
+                    Native.dialogTitle(dialogPtr, i),
-            Dialog("Seventh Sample Dialog", "Audio", pinned = false),
+                    Native.dialogPacked(dialogPtr, i),
-            Dialog("Eighth Sample Dialog", "Sticker (just kidding who uses that)", pinned = false),
+                    false
-            Dialog("Ninth Sample Dialog", "Hello, scroll!", pinned = false),
+                )
-        )
+            )
+        }
+        Native.freeDialogs(dialogPtr)
+
+        return dialogs
     }
 }

app/src/main/java/dev/lonami/talaria/ui/ChatScreen.kt

@@ -77,7 +77,7 @@ fun MessageInputField(
 }
 
 @Composable
-fun ChatScreen(chatViewModel: ChatViewModel = viewModel()) {
+fun ChatScreen(selectedDialog: String, chatViewModel: ChatViewModel = viewModel()) {
     val chatUiState by chatViewModel.uiState.collectAsState()
     var messageText by remember { mutableStateOf("") }
     val messageListState = rememberLazyListState()
@@ -92,7 +92,7 @@ fun ChatScreen(chatViewModel: ChatViewModel = viewModel()) {
         MessageInputField(messageText, onMessageChanged = {
             messageText = it
         }, onSendMessage = {
-            chatViewModel.sendMessage(messageText)
+            chatViewModel.sendMessage(selectedDialog, messageText)
             messageText = ""
             coroutineScope.launch {
                 messageListState.animateScrollToItem(chatUiState.messages.size - 1)
@@ -105,6 +105,6 @@ fun ChatScreen(chatViewModel: ChatViewModel = viewModel()) {
 @Composable
 fun ChatPreview() {
     TalariaTheme {
-        ChatScreen()
+        ChatScreen("")
     }
 }

app/src/main/java/dev/lonami/talaria/ui/ChatViewModel.kt

@@ -1,6 +1,7 @@
 package dev.lonami.talaria.ui
 
 import androidx.lifecycle.ViewModel
+import dev.lonami.talaria.bindings.Native
 import dev.lonami.talaria.data.MessageSource
 import dev.lonami.talaria.model.Message
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -16,7 +17,8 @@ class ChatViewModel : ViewModel() {
         _uiState.value = ChatUiState(MessageSource.loadMessages().toMutableList())
     }
 
-    fun sendMessage(message: String) {
+    fun sendMessage(dialog: String, message: String) {
+        Native.sendMessage(dialog, message)
         _uiState.update { state ->
             state.messages.add(Message("You", message))
             state

app/src/main/java/dev/lonami/talaria/ui/DialogScreen.kt

@@ -47,18 +47,21 @@ fun DialogCard(dialog: Dialog, onDialogSelected: () -> Unit) {
 }
 
 @Composable
-fun DialogList(dialogs: List<Dialog>, onDialogSelected: (Int) -> Unit) {
+fun DialogList(dialogs: List<Dialog>, onDialogSelected: (String) -> Unit) {
     LazyColumn {
         items(dialogs.size) {
             DialogCard(dialogs[it], onDialogSelected = {
-                onDialogSelected(it)
+                onDialogSelected(dialogs[it].lastMessage)
             })
         }
     }
 }
 
 @Composable
-fun DialogScreen(onDialogSelected: (Int) -> Unit, dialogViewModel: DialogViewModel = viewModel()) {
+fun DialogScreen(
+    onDialogSelected: (String) -> Unit,
+    dialogViewModel: DialogViewModel = viewModel()
+) {
     val dialogUiState by dialogViewModel.uiState.collectAsState()
     DialogList(dialogUiState.dialogs, onDialogSelected = onDialogSelected)
 }

app/src/main/java/dev/lonami/talaria/ui/LoginScreen.kt

@@ -18,6 +18,7 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import dev.lonami.talaria.R
+import dev.lonami.talaria.bindings.Native
 import dev.lonami.talaria.ui.theme.TalariaTheme
 
 enum class LoginStage {
@@ -90,6 +91,8 @@ fun LoginScreen(onConfirmOtp: () -> Unit) {
     var phone by remember { mutableStateOf("") }
     var otp by remember { mutableStateOf("") }
 
+    var tokenPtr by remember { mutableStateOf(0L) }
+
     Column(
         modifier = Modifier
             .fillMaxSize()
@@ -109,11 +112,18 @@ fun LoginScreen(onConfirmOtp: () -> Unit) {
             LoginStage.ASK_PHONE -> PhoneInput(
                 phone,
                 onPhoneChanged = { phone = it },
-                onSendCode = { stage = LoginStage.ASK_CODE })
+                onSendCode = {
+                    tokenPtr = Native.requestLoginCode(phone)
+                    stage = LoginStage.ASK_CODE
+                }
+            )
             LoginStage.ASK_CODE -> OtpInput(
                 otp,
                 onOtpChanged = { otp = it },
-                onConfirmOtp = onConfirmOtp
+                onConfirmOtp = {
+                    Native.signIn(tokenPtr, otp)
+                    onConfirmOtp()
+                }
             )
         }
     }

native/Cargo.toml

@@ -9,6 +9,14 @@ crate-type = ["cdylib"]
 
 [dependencies]
 jni = { version = "0.10.2", default-features = false }
+# v0.4 of grammers-* is currently unreleased; clone the project and use path dependencies
+grammers-client = { version = "0.4.0" }
+grammers-tl-types = { version = "0.4.0" }
+grammers-session = { version = "0.4.0" }
+tokio = { version = "1.5.0", features = ["full"] }
+log = "0.4.14"
+android_logger = "0.11.1"
+once_cell = "1.15.0"
 
 [profile.release]
 lto = true

native/src/lib.rs

@@ -2,19 +2,239 @@
 #![allow(non_snake_case)]
 
 use std::ffi::{CStr, CString};
+use std::future::Future;
 
+use grammers_client::{Client, Config};
+use grammers_client::types::{Dialog, LoginToken};
+use grammers_session::{PackedChat, Session};
 use jni::JNIEnv;
 use jni::objects::{JObject, JString};
-use jni::sys::jstring;
+use jni::sys::{jboolean, jint, jlong, jstring};
+use log;
+use log::{error, info, Level};
+use once_cell::sync::OnceCell;
+use tokio::runtime;
+use tokio::runtime::Runtime;
 
-#[no_mangle]
+const LOG_MIN_LEVEL: Level = Level::Trace;
-pub unsafe extern fn Java_dev_lonami_talaria_MainActivity_hello(env: JNIEnv, _: JObject, j_recipient: JString) -> jstring {
+const LOG_TAG: &str = ".native.talari";
-    let recipient = CString::from(
+const API_ID: i32 = 0;
-        CStr::from_ptr(
+const API_HASH: &str = "";
-            env.get_string(j_recipient).unwrap().as_ptr()
+
-        )
+type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+
+static RUNTIME: OnceCell<Runtime> = OnceCell::new();
+static CLIENT: OnceCell<Client> = OnceCell::new();
+
+fn block_on<F: Future>(future: F) -> F::Output {
+    if RUNTIME.get().is_none() {
+        RUNTIME
+            .set(
+                runtime::Builder::new_current_thread()
+                    .enable_all()
+                    .build()
+                    .unwrap(),
+            )
+            .ok();
+    }
+
+    RUNTIME.get().unwrap().block_on(future)
+}
+
+async fn init_client() -> Result<()> {
+    android_logger::init_once(
+        android_logger::Config::default()
+            .with_min_level(LOG_MIN_LEVEL)
+            .with_tag(LOG_TAG),
     );
 
-    let output = env.new_string("Hello ".to_owned() + recipient.to_str().unwrap()).unwrap();
+    if CLIENT.get().is_some() {
+        info!("Client is already initialized");
+        return Ok(());
+    }
+
+    info!("Connecting to Telegram...");
+
+    let client = Client::connect(Config {
+        session: Session::new(),
+        api_id: API_ID,
+        api_hash: API_HASH.to_string(),
+        params: Default::default(),
+    })
+        .await?;
+
+    info!("Connected!");
+
+    CLIENT
+        .set(client)
+        .map_err(|_| "Client was already initialized")?;
+
+    Ok(())
+}
+
+async fn need_login() -> Result<bool> {
+    let client = CLIENT.get().ok_or("Client not initialized")?;
+    Ok(client.is_authorized().await?)
+}
+
+async fn request_login_code(phone: &str) -> Result<LoginToken> {
+    let client = CLIENT.get().ok_or("Client not initialized")?;
+    let token = client.request_login_code(&phone, API_ID, API_HASH).await?;
+    Ok(token)
+}
+
+async fn sign_in(token: LoginToken, code: &str) -> Result<()> {
+    let client = CLIENT.get().ok_or("Client not initialized")?;
+    client.sign_in(&token, &code).await?;
+    Ok(())
+}
+
+async fn get_dialogs() -> Result<Vec<Dialog>> {
+    let client = CLIENT.get().ok_or("Client not initialized")?;
+
+    let mut result = Vec::new();
+    let mut dialogs = client.iter_dialogs();
+    while let Some(dialog) = dialogs.next().await? {
+        result.push(dialog);
+    }
+    Ok(result)
+}
+
+async fn send_message(chat: PackedChat, text: &str) -> Result<()> {
+    let client = CLIENT.get().ok_or("Client not initialized")?;
+    client.send_message(chat, text).await?;
+    Ok(())
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_initClient(_: JNIEnv, _: JObject) {
+    match block_on(init_client()) {
+        Ok(_) => info!("Client initialized"),
+        Err(e) => error!("Failed to initialize client: {}", e),
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_needLogin(
+    _: JNIEnv,
+    _: JObject,
+) -> jboolean {
+    match block_on(need_login()) {
+        Ok(login) => login.into(),
+        Err(e) => {
+            error!("Failed to check if user is authorized: {}", e);
+            false.into()
+        }
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_requestLoginCode(
+    env: JNIEnv,
+    _: JObject,
+    phone: JString,
+) -> jlong {
+    let phone = CString::from(CStr::from_ptr(env.get_string(phone).unwrap().as_ptr()));
+
+    match block_on(request_login_code(phone.to_str().unwrap())) {
+        Ok(token) => Box::into_raw(Box::new(token)) as jlong,
+        Err(e) => {
+            error!("Failed to request login code: {}", e);
+            0 as jlong
+        }
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_signIn(
+    env: JNIEnv,
+    _: JObject,
+    token_ptr: jlong,
+    code: JString,
+) {
+    let token = *Box::from_raw(token_ptr as *mut LoginToken);
+    let code = CString::from(CStr::from_ptr(env.get_string(code).unwrap().as_ptr()));
+
+    match block_on(sign_in(token, code.to_str().unwrap())) {
+        Ok(_) => info!("Sign in success"),
+        Err(e) => error!("Failed to sign in: {}", e),
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_getDialogs(
+    _: JNIEnv,
+    _: JObject,
+) -> jlong {
+    match block_on(get_dialogs()) {
+        Ok(dialogs) => Box::into_raw(Box::new(dialogs)) as jlong,
+        Err(e) => {
+            error!("Failed to get dialogs: {}", e);
+            0 as jlong
+        }
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_dialogCount(
+    _: JNIEnv,
+    _: JObject,
+    dialogs_ptr: jlong,
+) -> jint {
+    let dialogs = Box::leak(Box::from_raw(dialogs_ptr as *mut Vec<Dialog>));
+    dialogs.len() as jint
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_dialogPacked(
+    env: JNIEnv,
+    _: JObject,
+    dialogs_ptr: jlong,
+    index: jint,
+) -> jstring {
+    let dialogs = Box::leak(Box::from_raw(dialogs_ptr as *mut Vec<Dialog>));
+
+    let packed = dialogs[index as usize].chat().pack().to_hex();
+    let output = env.new_string(packed).unwrap();
     output.into_inner()
 }
+
+#[no_mangle]
+pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_dialogTitle(
+    env: JNIEnv,
+    _: JObject,
+    dialogs_ptr: jlong,
+    index: jint,
+) -> jstring {
+    let dialogs = Box::leak(Box::from_raw(dialogs_ptr as *mut Vec<Dialog>));
+
+    let title = dialogs[index as usize].chat().name();
+    let output = env.new_string(title).unwrap();
+    output.into_inner()
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_freeDialogs(
+    _: JNIEnv,
+    _: JObject,
+    dialogs_ptr: jlong,
+) {
+    let _ = Box::from_raw(dialogs_ptr as *mut Vec<Dialog>);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_sendMessage(
+    env: JNIEnv,
+    _: JObject,
+    packed: JString,
+    text: JString,
+) {
+    let packed = CString::from(CStr::from_ptr(env.get_string(packed).unwrap().as_ptr()));
+    let text = CString::from(CStr::from_ptr(env.get_string(text).unwrap().as_ptr()));
+
+    let packed = PackedChat::from_hex(packed.to_str().unwrap()).unwrap();
+    match block_on(send_message(packed, text.to_str().unwrap())) {
+        Ok(_) => info!("Message sent"),
+        Err(e) => error!("Failed to send message: {}", e),
+    }
+}