Merge pull request #3127 from element-hq/feature/bma/elementWellKnown

Let the SDK retrieve and parse Element well known content

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/RustMatrixClient.kt

@@ -280,6 +280,23 @@ class RustMatrixClient(
         }
     }
 
+    override fun userIdServerName(): String {
+        return runCatching {
+            client.userIdServerName()
+        }
+            .onFailure {
+                Timber.w(it, "Failed to get userIdServerName")
+            }
+            .getOrNull()
+            ?: sessionId.value.substringAfter(":")
+    }
+
+    override suspend fun getUrl(url: String): Result<String> = withContext(sessionDispatcher) {
+        runCatching {
+            client.getUrl(url)
+        }
+    }
+
     override suspend fun getRoom(roomId: RoomId): MatrixRoom? {
         return roomFactory.create(roomId)
     }

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/call/DefaultElementCallBaseUrlProvider.kt

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2024 New Vector Ltd
+ *
+ * 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
+ *
+ *     https://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 io.element.android.libraries.matrix.impl.call
+
+import com.squareup.anvil.annotations.ContributesBinding
+import io.element.android.libraries.di.AppScope
+import io.element.android.libraries.matrix.api.MatrixClient
+import io.element.android.libraries.matrix.api.call.ElementCallBaseUrlProvider
+import timber.log.Timber
+import javax.inject.Inject
+
+@ContributesBinding(AppScope::class)
+class DefaultElementCallBaseUrlProvider @Inject constructor(
+    private val elementWellKnownParser: ElementWellKnownParser,
+) : ElementCallBaseUrlProvider {
+    override suspend fun provides(matrixClient: MatrixClient): String? {
+        val url = buildString {
+            append("https://")
+            append(matrixClient.userIdServerName())
+            append("/.well-known/element/element.json")
+        }
+        return matrixClient.getUrl(url)
+            .onFailure { failure ->
+                Timber.w(failure, "Failed to fetch well-known element.json")
+            }
+            .getOrNull()
+            ?.let { wellKnownStr ->
+                elementWellKnownParser.parse(wellKnownStr)
+                    .onFailure { failure ->
+                        // Can be a HTML 404.
+                        Timber.w(failure, "Failed to parse content")
+                    }
+                    .getOrNull()
+            }
+            ?.call
+            ?.widgetUrl
+    }
+}

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/call/ElementWellKnownParser.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2024 New Vector Ltd
+ *
+ * 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
+ *
+ *     https://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 io.element.android.libraries.matrix.impl.call
+
+import com.squareup.anvil.annotations.ContributesBinding
+import io.element.android.libraries.di.AppScope
+import org.matrix.rustcomponents.sdk.ElementWellKnown
+import org.matrix.rustcomponents.sdk.makeElementWellKnown
+import javax.inject.Inject
+
+interface ElementWellKnownParser {
+    fun parse(str: String): Result<ElementWellKnown>
+}
+
+@ContributesBinding(AppScope::class)
+class RustElementWellKnownParser @Inject constructor() : ElementWellKnownParser {
+    override fun parse(str: String): Result<ElementWellKnown> {
+        return runCatching {
+            makeElementWellKnown(str)
+        }
+    }
+}

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/server/DefaultUserServerResolver.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2024 New Vector Ltd
+ *
+ * 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
+ *
+ *     https://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 io.element.android.libraries.matrix.impl.server
+
+import com.squareup.anvil.annotations.ContributesBinding
+import io.element.android.libraries.di.SessionScope
+import io.element.android.libraries.matrix.api.MatrixClient
+import io.element.android.libraries.matrix.api.server.UserServerResolver
+import javax.inject.Inject
+
+@ContributesBinding(SessionScope::class)
+class DefaultUserServerResolver @Inject constructor(
+    private val matrixClient: MatrixClient,
+) : UserServerResolver {
+    override fun resolve(): String {
+        return matrixClient.userIdServerName()
+    }
+}