Client side validation of alias max length

changelog.d/3934.bugfix

@@ -0,0 +1 @@
+Validate public space address length when user clicks away from

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/MatrixConstants.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2021 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.api
+
+/**
+ * This object define some global constants regarding the Matrix specification
+ */
+object MatrixConstants {
+    /**
+     * Max length for an alias. Room aliases MUST NOT exceed 255 bytes (including the # sigil and the domain).
+     * See [maxAliasLocalPartLength]
+     * Ref. https://matrix.org/docs/spec/appendices#room-aliases
+     */
+    const val ALIAS_MAX_LENGTH = 255
+
+    fun maxAliasLocalPartLength(domain: String): Int {
+        return (ALIAS_MAX_LENGTH - 1 /* # sigil */ - 1 /* ':' */ - domain.length)
+                .coerceAtLeast(0)
+    }
+}

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/MatrixPatterns.kt

@@ -162,10 +162,14 @@ object MatrixPatterns {
         return order != null && order.length < 50 && order matches ORDER_STRING_REGEX
     }
 
-    fun candidateAliasFromRoomName(name: String): String {
-        return Regex("\\s").replace(name.lowercase(), "_").let {
-            "[^a-z0-9._%#@=+-]".toRegex().replace(it, "")
-        }
+    fun candidateAliasFromRoomName(roomName: String, domain: String): String {
+        return roomName.lowercase()
+                // Replace spaces by '_'
+                .let { Regex("\\s").replace(it, "_") }
+                // Remove all invalid chars
+                .let { "[^a-z0-9._%#@=+-]".toRegex().replace(it, "") }
+                // limit length
+                .substring(0, MatrixConstants.maxAliasLocalPartLength(domain))
     }
 
     /**

vector/src/main/java/im/vector/app/features/form/FormEditTextItem.kt

@@ -17,6 +17,7 @@
 package im.vector.app.features.form
 
 import android.text.Editable
+import android.text.InputFilter
 import android.view.View
 import android.view.inputmethod.EditorInfo
 import android.widget.TextView
@@ -77,6 +78,9 @@ abstract class FormEditTextItem : VectorEpoxyModel<FormEditTextItem.Holder>() {
     @EpoxyAttribute
     var suffixText: String? = null
 
+    @EpoxyAttribute
+    var maxLength: Int? = null
+
     private val onTextChangeListener = object : SimpleTextWatcher() {
         override fun afterTextChanged(s: Editable) {
             onTextChange?.invoke(s.toString())
@@ -109,6 +113,15 @@ abstract class FormEditTextItem : VectorEpoxyModel<FormEditTextItem.Holder>() {
         holder.textInputEditText.addTextChangedListenerOnce(onTextChangeListener)
         holder.textInputEditText.setOnEditorActionListener(editorActionListener)
         holder.textInputEditText.onFocusChangeListener = onFocusChangedListener
+
+        if (maxLength != null) {
+            holder.textInputEditText.filters = arrayOf(InputFilter.LengthFilter(maxLength!!))
+            holder.textInputLayout.isCounterEnabled = true
+            holder.textInputLayout.counterMaxLength = maxLength!!
+        } else {
+            holder.textInputEditText.filters = arrayOf()
+            holder.textInputLayout.isCounterEnabled = false
+        }
     }
 
     override fun shouldSaveViewState(): Boolean {

vector/src/main/java/im/vector/app/features/roomdirectory/createroom/CreateRoomController.kt

@@ -29,6 +29,7 @@ import im.vector.app.features.form.formEditTextItem
 import im.vector.app.features.form.formEditableAvatarItem
 import im.vector.app.features.form.formSubmitButtonItem
 import im.vector.app.features.form.formSwitchItem
+import org.matrix.android.sdk.api.MatrixConstants
 import org.matrix.android.sdk.api.extensions.orFalse
 import org.matrix.android.sdk.api.session.room.failure.CreateRoomFailure
 import org.matrix.android.sdk.api.session.room.model.RoomJoinRules
@@ -141,6 +142,7 @@ class CreateRoomController @Inject constructor(
                 value(viewState.aliasLocalPart)
                 suffixText(":" + viewState.homeServerName)
                 prefixText("#")
+                maxLength(MatrixConstants.maxAliasLocalPartLength(viewState.homeServerName))
                 hint(host.stringProvider.getString(R.string.room_alias_address_hint))
                 errorMessage(
                         host.roomAliasErrorFormatter.format(

vector/src/main/java/im/vector/app/features/roomdirectory/createroom/CreateRoomViewModel.kt

@@ -56,7 +56,7 @@ import timber.log.Timber
 class CreateRoomViewModel @AssistedInject constructor(@Assisted private val initialState: CreateRoomViewState,
                                                       private val session: Session,
                                                       private val rawService: RawService,
-                                                      private val vectorPreferences: VectorPreferences
+                                                      vectorPreferences: VectorPreferences
 ) : VectorViewModel<CreateRoomViewState, CreateRoomAction, CreateRoomViewEvents>(initialState) {
 
     @AssistedFactory

vector/src/main/java/im/vector/app/features/roomdirectory/createroom/CreateSubSpaceController.kt

@@ -28,6 +28,7 @@ import im.vector.app.features.form.formEditTextItem
 import im.vector.app.features.form.formEditableSquareAvatarItem
 import im.vector.app.features.form.formMultiLineEditTextItem
 import im.vector.app.features.form.formSubmitButtonItem
+import org.matrix.android.sdk.api.MatrixConstants
 import org.matrix.android.sdk.api.session.room.failure.CreateRoomFailure
 import org.matrix.android.sdk.api.session.room.model.RoomJoinRules
 import javax.inject.Inject
@@ -81,6 +82,7 @@ class CreateSubSpaceController @Inject constructor(
                 hint(host.stringProvider.getString(R.string.create_space_alias_hint))
                 suffixText(":" + data.homeServerName)
                 prefixText("#")
+                maxLength(MatrixConstants.maxAliasLocalPartLength(data.homeServerName))
                 errorMessage(
                         host.roomAliasErrorFormatter.format(
                                 (((data.asyncCreateRoomRequest as? Fail)?.error) as? CreateRoomFailure.AliasError)?.aliasError)

vector/src/main/java/im/vector/app/features/roomprofile/alias/RoomAliasController.kt

@@ -36,6 +36,7 @@ import im.vector.app.features.discovery.settingsInfoItem
 import im.vector.app.features.form.formEditTextItem
 import im.vector.app.features.form.formSwitchItem
 import im.vector.app.features.roomdirectory.createroom.RoomAliasErrorFormatter
+import org.matrix.android.sdk.api.MatrixConstants
 import org.matrix.android.sdk.api.session.room.alias.RoomAliasError
 import org.matrix.android.sdk.api.session.room.model.RoomDirectoryVisibility
 import org.matrix.android.sdk.api.session.room.model.RoomType
@@ -253,6 +254,7 @@ class RoomAliasController @Inject constructor(
                     value(data.newLocalAliasState.value)
                     suffixText(":" + data.homeServerName)
                     prefixText("#")
+                    maxLength(MatrixConstants.maxAliasLocalPartLength(data.homeServerName))
                     hint(host.stringProvider.getString(R.string.room_alias_address_hint))
                     errorMessage(host.roomAliasErrorFormatter.format((data.newLocalAliasState.asyncRequest as? Fail)?.error as? RoomAliasError))
                     onTextChange { value ->

vector/src/main/java/im/vector/app/features/spaces/create/CreateSpaceState.kt

@@ -28,7 +28,7 @@ data class CreateSpaceState(
         val step: Step = Step.ChooseType,
         val spaceType: SpaceType? = null,
         val spaceTopology: SpaceTopology? = null,
-        val homeServerName: String? = null,
+        val homeServerName: String = "",
         val aliasLocalPart: String? = null,
         val aliasManuallyModified: Boolean = false,
         val aliasVerificationTask: Async<Boolean> = Uninitialized,

vector/src/main/java/im/vector/app/features/spaces/create/CreateSpaceViewModel.kt

@@ -134,7 +134,7 @@ class CreateSpaceViewModel @AssistedInject constructor(
                         )
                     } else {
                         val tentativeAlias =
-                                MatrixPatterns.candidateAliasFromRoomName(action.name)
+                                MatrixPatterns.candidateAliasFromRoomName(action.name, homeServerName)
                         copy(
                                 nameInlineError = null,
                                 name = action.name,

vector/src/main/java/im/vector/app/features/spaces/create/SpaceDetailEpoxyController.kt

@@ -27,6 +27,7 @@ import im.vector.app.features.form.formEditableSquareAvatarItem
 import im.vector.app.features.form.formMultiLineEditTextItem
 import im.vector.app.features.home.AvatarRenderer
 import im.vector.app.features.roomdirectory.createroom.RoomAliasErrorFormatter
+import org.matrix.android.sdk.api.MatrixConstants
 import org.matrix.android.sdk.api.session.room.alias.RoomAliasError
 import org.matrix.android.sdk.api.util.MatrixItem
 import javax.inject.Inject
@@ -94,6 +95,7 @@ class SpaceDetailEpoxyController @Inject constructor(
                 hint(host.stringProvider.getString(R.string.create_space_alias_hint))
                 suffixText(":" + data.homeServerName)
                 prefixText("#")
+                maxLength(MatrixConstants.maxAliasLocalPartLength(data.homeServerName))
                 onFocusChange { hasFocus ->
                     host.aliasTextIsFocused = hasFocus
                 }