feat(room address) : extract some reusable code

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/room/address/RoomAddressField.kt

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.matrix.ui.room.address
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import io.element.android.compound.theme.ElementTheme
+import io.element.android.libraries.designsystem.preview.ElementPreview
+import io.element.android.libraries.designsystem.preview.PreviewsDayNight
+import io.element.android.libraries.designsystem.theme.components.Text
+import io.element.android.libraries.designsystem.theme.components.TextField
+import io.element.android.libraries.ui.strings.CommonStrings
+
+@Composable
+fun RoomAddressField(
+    address: String,
+    homeserverName: String,
+    addressValidity: RoomAddressValidity,
+    onAddressChange: (String) -> Unit,
+    label: String,
+    supportingText: String,
+    modifier: Modifier = Modifier,
+) {
+    TextField(
+        modifier = modifier,
+        value = address,
+        label = label,
+        leadingIcon = {
+            Text(
+                text = "#",
+                style = ElementTheme.typography.fontBodyLgMedium,
+                color = ElementTheme.colors.textSecondary,
+            )
+        },
+        trailingIcon = {
+            Text(
+                text = homeserverName,
+                style = ElementTheme.typography.fontBodyLgMedium,
+                color = ElementTheme.colors.textSecondary,
+            )
+        },
+        supportingText = when (addressValidity) {
+            RoomAddressValidity.InvalidSymbols -> {
+                stringResource(CommonStrings.error_room_address_invalid_symbols)
+            }
+            RoomAddressValidity.NotAvailable -> {
+                stringResource(CommonStrings.error_room_address_already_exists)
+            }
+            else -> supportingText
+        },
+        isError = addressValidity.isError(),
+        onValueChange = onAddressChange,
+        singleLine = true,
+    )
+}
+
+@PreviewsDayNight
+@Composable
+fun RoomAddressFieldPreview()  = ElementPreview {
+    RoomAddressField(
+        address = "room",
+        homeserverName = "element.io",
+        addressValidity = RoomAddressValidity.Valid,
+        onAddressChange = {},
+        label = "Room address",
+        supportingText = "This is the address that people will use to join your room",
+    )
+}

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/room/address/RoomAddressValidity.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.matrix.ui.room.address
+
+import androidx.compose.runtime.Immutable
+
+/**
+ * Represents the validity state of a room address.
+ * ie. whether it contains invalid characters, is already taken, or is valid.
+ */
+@Immutable
+sealed interface RoomAddressValidity {
+    data object Unknown : RoomAddressValidity
+    data object InvalidSymbols : RoomAddressValidity
+    data object NotAvailable : RoomAddressValidity
+    data object Valid : RoomAddressValidity
+
+    fun isError(): Boolean {
+        return this is InvalidSymbols || this is NotAvailable
+    }
+}

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/room/address/RoomAddressValidityEffect.kt

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.matrix.ui.room.address
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.rememberUpdatedState
+import io.element.android.libraries.matrix.api.MatrixClient
+import io.element.android.libraries.matrix.api.room.alias.RoomAliasHelper
+import io.element.android.libraries.matrix.api.roomAliasFromName
+import kotlinx.coroutines.delay
+
+@Composable
+fun RoomAddressValidityEffect(
+    client: MatrixClient,
+    roomAliasHelper: RoomAliasHelper,
+    newRoomAddress: String,
+    knownRoomAddress: String?,
+    onRoomAddressValidityChange: (RoomAddressValidity) -> Unit,
+) {
+    val onChange by rememberUpdatedState(onRoomAddressValidityChange)
+    LaunchedEffect(newRoomAddress) {
+        if (newRoomAddress.isEmpty() || newRoomAddress == knownRoomAddress) {
+            onChange(RoomAddressValidity.Unknown)
+            return@LaunchedEffect
+        }
+        // debounce the room address validation
+        delay(300)
+        val roomAlias = client.roomAliasFromName(newRoomAddress).getOrNull()
+        if (roomAlias == null || !roomAliasHelper.isRoomAliasValid(roomAlias)) {
+            onChange(RoomAddressValidity.InvalidSymbols)
+        } else {
+            client.resolveRoomAlias(roomAlias)
+                .onSuccess { resolved ->
+                    if (resolved.isPresent) {
+                        onChange(RoomAddressValidity.NotAvailable)
+                    } else {
+                        onChange(RoomAddressValidity.Valid)
+                    }
+                }
+                .onFailure {
+                    onChange(RoomAddressValidity.Valid)
+                }
+        }
+    }
+}