feat: add log in and add device via QR

core/models/src/main/java/org/monogram/core/models/DeviceSession.kt

@@ -0,0 +1,16 @@
+package org.monogram.core.models
+
+data class DeviceSession(
+    val hash: Long,
+    val current: Boolean,
+    val passwordPending: Boolean,
+    val deviceModel: String,
+    val platform: String,
+    val systemVersion: String,
+    val appName: String,
+    val appVersion: String,
+    val dateActive: Int,
+    val ip: String,
+    val country: String,
+    val region: String,
+)

core/models/src/main/java/org/monogram/core/models/QrLogin.kt

@@ -0,0 +1,9 @@
+package org.monogram.core.models
+
+sealed interface QrLogin {
+    class Code(val link: String, val expires: Int) : QrLogin
+
+    data class Authorized(val session: AuthSession) : QrLogin
+
+    data object AwaitingPassword : QrLogin
+}

core/ui/src/main/java/org/monogram/core/ui/components/QrCodeScreen.kt

@@ -0,0 +1,108 @@
+package org.monogram.core.ui.components
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.BoxWithConstraints
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.safeDrawing
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.foundation.layout.windowInsetsPadding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.outlined.ArrowBack
+import androidx.compose.material3.FilledTonalIconButton
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButtonDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+
+@Composable
+fun QrCodeScreen(
+    title: String,
+    description: String,
+    icon: ImageVector,
+    backDescription: String,
+    onBack: () -> Unit,
+    modifier: Modifier = Modifier,
+    descriptionAlignment: TextAlign = TextAlign.Start,
+    content: @Composable ColumnScope.() -> Unit,
+) {
+    Surface(modifier.fillMaxSize(), color = MaterialTheme.colorScheme.surfaceContainer) {
+        BoxWithConstraints(Modifier.fillMaxSize().windowInsetsPadding(WindowInsets.safeDrawing)) {
+            val contentGap = (maxHeight * 0.13f).coerceIn(32.dp, 112.dp)
+            Column(
+                modifier =
+                    Modifier.align(Alignment.TopCenter)
+                        .widthIn(max = 600.dp)
+                        .fillMaxWidth()
+                        .verticalScroll(rememberScrollState())
+                        .padding(horizontal = 24.dp, vertical = 16.dp),
+                horizontalAlignment = Alignment.CenterHorizontally,
+            ) {
+                Box(Modifier.fillMaxWidth().height(72.dp)) {
+                    FilledTonalIconButton(
+                        onClick = onBack,
+                        modifier = Modifier.align(Alignment.CenterStart).size(44.dp),
+                        shape = CircleShape,
+                        colors =
+                            IconButtonDefaults.filledTonalIconButtonColors(
+                                containerColor = MaterialTheme.colorScheme.surfaceContainerHigh,
+                                contentColor = MaterialTheme.colorScheme.onSurface,
+                            ),
+                    ) {
+                        Icon(
+                            Icons.AutoMirrored.Outlined.ArrowBack,
+                            contentDescription = backDescription,
+                        )
+                    }
+                    Icon(
+                        icon,
+                        contentDescription = null,
+                        tint = MaterialTheme.colorScheme.primary,
+                        modifier = Modifier.align(Alignment.Center).size(48.dp),
+                    )
+                }
+                Spacer(Modifier.height(24.dp))
+                Text(
+                    title,
+                    modifier = Modifier.fillMaxWidth(),
+                    style = MaterialTheme.typography.displaySmall,
+                )
+                Spacer(Modifier.height(24.dp))
+                Text(
+                    description,
+                    modifier = Modifier.fillMaxWidth(),
+                    style = MaterialTheme.typography.bodyLarge,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    textAlign = descriptionAlignment,
+                )
+                Spacer(Modifier.height(contentGap))
+                Column(
+                    modifier =
+                        Modifier.padding(horizontal = 24.dp).widthIn(max = 360.dp).fillMaxWidth(),
+                    horizontalAlignment = Alignment.CenterHorizontally,
+                    verticalArrangement = Arrangement.spacedBy(24.dp),
+                    content = content,
+                )
+                Spacer(Modifier.height(32.dp))
+            }
+        }
+    }
+}

core/ui/src/main/java/org/monogram/core/ui/qr/QrCode.kt

@@ -0,0 +1,23 @@
+package org.monogram.core.ui.qr
+
+import android.graphics.Bitmap
+import uniffi.monogram_mtproto.decodeQrCode
+import uniffi.monogram_mtproto.generateQrCode
+
+object QrCode {
+    fun render(text: String, size: Int, foreground: Int, background: Int): Bitmap {
+        require(size in 1..2048)
+        val matrix = generateQrCode(text, size.toUInt())
+        val pixels =
+            IntArray(matrix.luma.size) { index ->
+                if (matrix.luma[index] == 0.toByte()) foreground else background
+            }
+        val side = matrix.size.toInt()
+        return Bitmap.createBitmap(pixels, side, side, Bitmap.Config.ARGB_8888)
+    }
+
+    fun decode(luma: ByteArray, width: Int, height: Int): String? {
+        require(width in 1..2048 && height in 1..2048 && luma.size == width * height)
+        return decodeQrCode(luma, width.toUInt(), height.toUInt())
+    }
+}

feature/auth/build.gradle.kts

@@ -24,6 +24,8 @@ android {
 }
 
 dependencies {
+    implementation(libs.androidx.activity.compose)
+    implementation(libs.androidx.lifecycle.runtime.compose)
     implementation(project(":core:common"))
     implementation(project(":core:models"))
     implementation(libs.mvikotlin)