Add support for io.element.call:/?url=some-encoded-url uri

features/call/src/main/AndroidManifest.xml

@@ -53,6 +53,14 @@
                 <data android:scheme="element" />
                 <data android:host="call" />
             </intent-filter>
+            <!-- Custom scheme to handle urls from other domains in the format: io.element.call:/?url=https%3A%2F%2Felement.io -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="io.element.call" />
+            </intent-filter>
 
         </activity>
         <service android:name=".CallForegroundService" android:enabled="true" android:foregroundServiceType="mediaPlayback" />

features/call/src/main/kotlin/io/element/android/features/call/CallIntentDataParser.kt

@@ -38,6 +38,16 @@ object CallIntentDataParser {
                         internalUri.scheme in validHttpSchemes && !internalUri.host.isNullOrBlank()
                     }
             }
+            scheme == "io.element.call" && parsedUrl.host == null -> {
+                // We use this custom scheme to load arbitrary URLs for other instances of Element Call,
+                // so we can only verify it's an HTTP/HTTPs URL with a non-empty host
+                parsedUrl.getQueryParameter("url")
+                    ?.let { URLDecoder.decode(it, "utf-8") }
+                    ?.takeIf {
+                        val internalUri = Uri.parse(it)
+                        internalUri.scheme in validHttpSchemes && !internalUri.host.isNullOrBlank()
+                    }
+            }
             // This should never be possible, but we still need to take into account the possibility
             else -> null
         }

tools/adb/callLinkCustomScheme2.sh

@@ -0,0 +1,23 @@
+#! /bin/bash
+#
+# Copyright (c) 2023 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
+#
+#     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.
+#
+
+# Format is:
+# io.element.call:/?url=some-encoded-url
+# For instance
+# io.element.call:/?url=https%3A%2F%2Fcall.element.io%2FTestElementCall
+
+adb shell am start -a android.intent.action.VIEW -d io.element.call:/?url=https%3A%2F%2Fcall.element.io%2FTestElementCall